• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    patent specification: "slag supplier container for use in electric furnace for steel slag reduction processing". The present invention relates to an electric furnace slag supply container for steel slag reduction processing which includes: a container body that causes the hot steel slag to flow into the electric furnace; a slag discharge portion connected to a slag supply side door to the electric furnace; a slag receiving portion receiving the supplied hot steel slag; a lid that opens and closes the slag receiving portion; an exhaust portion discharging exhaust gas from the electric furnace; and a tilt unit that tilts the container body to adjust the amount of hot steel slag inlet flow to the slag supply side door to the electric furnace.
    公开号:BR112014011858B1
    申请号:R112014011858-2
    申请日:2013-06-27
    公开日:2019-06-25
    发明作者:Toshiya Harada；Takashi Arai；Hiroki Fukumura
    申请人:Nippon Steel & Sumitomo Metal Corporation；
    IPC主号:
    专利说明:

    Report of the Invention Patent for "SCREW SUPPLIER FOR USE IN ELECTRICAL OVEN FOR PROCESSING OF STEEL SCORIA REDUCTION".
    The present invention relates to a container which provides hot-melt steel slag in an electric furnace which recovers valuable components by reducing the slag (steel slag) generated during the steelmaking process on an industrial scale, while modifies properties of the steel slag in order to reach several applications.
    The present application claims priority based on the Japanese Patent Application No. 2012-144473 registered in Japan on June 27, 2012, in the Japanese Patent Application No. 2012-144557 registered in Japan on June 27, 2012, and Japanese Patent Application No. 2012-235692 filed in Japan on October 25, 2012, the disclosures of which are hereby incorporated by reference in their entirety. Background Art [003] During the steel production process, a large amount of steel slag is generated. Although steel slag contains, for example, P and metal components such as Fe and Mn, it also contains a large amount of CaO, which leads to expansion and collapse. This has restricted the steel slag to be used, for example, as roadbed or aggregate material. However, in recent years, sources have been increasingly recycled, and a large number of methods for recovering valuable substances from steel slag have been described.
    Patent Document 1 describes a method of processing iron and steel slag, which includes adding the iron and steel slag generated during the melting and the production of the steel to the cast iron and the liquid steel in a melting furnace , also add heat and reducing agents, move Fe, Mn and P to the molten liquid while changing the steel slag to obtain a modified slag, and then move the Mn and P in the molten liquid to the slag. However, such a processing method requires that batch processing be applied continuously several times until the slag with predetermined components can be obtained, and then results in poor working efficiency.
    Non-Patent Document 1 describes the results of the reduction tests in which powdered steel slag, powdered carbon material, and powder slag modifying agent are inserted through a hollow electrode in an electric furnace. However, in the reduction tests described in Non-Patent Document 1, processing is performed in the electric furnace for the cold steel slag which has been solidified and ground, which leads to an increase in the rate of energy consumption.
    In addition, Patent Document 2 describes a technique for recovering valuable metals by reducing molten slags generated during casting of non-ferrous metals using reducing carbonaceous agents in an open type electric furnace of the open type for separating them into a metallic phase and a slag phase. However, the method described in Patent Document 2 also involves batch processing in the electric furnace for the purpose of processing the slag being cold, which also leads to an increase in the rate of energy consumption.
    As described above, such conventional methods of recovering valuable slag components each have a problem of poor working efficiency or high rate of energy consumption.
    Patent Document 1: Unexamined Japanese Patent Application, First Publication No. S52-033897 Patent Document 2: Australian Patent No. AU-B -20553/95 Non-Patent Document Non-Patent Document 1: Scandinavian Journal of Metallurgy 2003; 32: pgs.7-14 Description of the invention Problems to be solved by the invention As described above, with the conventional method which recycles the steel slag through batch processing, the work efficiency is poor. In addition, the conventional method, which melts and recycles cold steel slag as sources, has the problem of high rate of energy consumption.
    In view of the facts described above, the aim of the present invention is to provide a slag supplier that can accommodate, in a hot state, slag that has melt flow during the heat to continuously reduce the hot steel slag in an electric furnace , and load the steel slag into the electric furnace while suppressing foaming of the slag so that it can achieve favorable working efficiency and a reduced energy consumption rate.
    Means for solving the problem The present invention has been made on the basis of the findings described above, and the main points of the present invention are as follows: A first aspect of the present invention provides a furnace slag vessel of an electric furnace for a steel slag reduction process, which causes the steel slag to flow to a layer of molten slag in the cast iron in the electric furnace through a slag supply side door to the electric furnace, the slag supply vessel including: a slag body comprising a top wall, a bottom wall, and a side wall disposed between the top wall and the bottom wall, and which causes the steel slag to flow into the electric furnace; a slag discharge portion which is disposed at an end portion of the container body and is connected with the slag supply side port to the electric oven; a slag receiving portion which is disposed on the side wall or upper wall of the container body and receives supply from the steel slag; a lid that opens or closes the receiving portion of the slag; a discharge portion which is disposed in the container body and discharges the exhaust gas from the electric furnace; and a tilt unit tilting the container body to adjust the inlet flow amount of the hot steel slag to the electric furnace slag supply side port. The slag supply container according to item (1) above may include a portion whose side wall has a height that gradually decreases towards the discharge portion of the slag. In the slag supply container according to item (1) or (2) above, the top wall or side wall may include a first gas blowing nozzle which blows oxygen or an oxygen containing gas in the container body.
    In the slag supply vessel according to any one of items (1) to (3) above, the top wall or side wall includes a torch.
    In the slag supply vessel according to any one of items (1) to (4) above, the top wall or side wall may include a melt radiation unit which provides a slag modification agent in a cast form.
    In the slag supply vessel according to any one of items (1) to (5) above, the bottom wall may include a second gas blowing nozzle which blows a mixture of N2 and O2 gas into the container body.
    The slag supply vessel according to any one of items (1) to (6) above may include a weight measuring unit which measures the amount of change in mass of the hot steel slag in the container body.
    The slag supply vessel according to any one of items (1) to (7) above may include a wagon disposed at the bottom of the bottom wall and used to replace the container body. In the slag supply vessel according to any one of items (1) to (8) above, the discharge portion may be connected to a dust catcher.
    Effects of the Invention In accordance with the aspects described above, it is possible to load the slag that has flowability while hot to a layer (reduced slag layer) of molten slag cast in the electric furnace without causing a rapid spill. Thus, it is possible to maintain the execution of melt processing and reduction in the electric furnace without fracture.
    BRIEF DESCRIPTION OF THE DRAWINGS FIGURE 1 is a schematic view illustrating an arrangement of a slag supply vessel and an electric furnace.
    FIGURE 2 is a schematic view illustrating one mode of the slag supply vessel.
    FIGURE 3 is a schematic view illustrating another mode of the slag supply vessel.
    Modes of the invention The present inventors has made a detailed study in a structure of a slag supply vessel that can achieve the purpose described above. As a result, it has been found that when a slag having flowing while hot is loaded into a layer of molten slag (reduced slag layer) formed in the cast iron in the electric furnace for processing the slag reduction, it is possible to suppress the occurrence of rapid spillage during loading of the steel slag into the electric furnace, and to maintain the execution of the melting and reduction process in the electric furnace without fracture, using a slag supply vessel having: a structure which can temporarily store and maintaining the steel slag having flowability while hot, and [0032] a structure that can adjust the amount of inflow into the electric furnace.
    A slag supply vessel according to one embodiment of the present invention will be described in detail below based on the above described disclosures in connection with the drawing. It will be appreciated that it is only necessary that the hot steel slag loaded in the electric furnace with the slag supply vessel according to the present invention be slag generated during the steel production processes, and the hot steel slag is not limited to slag having a specific type or a specific composition.
    In addition, hot steel slag (hereinafter also referred to simply as steel slag), which is the subject of the present invention and generally charged overhead in the electric furnace, is steel slag having flowability while hot, only needs to have sufficient flowability with whereby the steel slag can be charged continuously or intermittently in the electric furnace through the slag supply vessel and not necessarily in a fully molten state. The solid phase rate of the hot steel slag is not specifically limited. For example, the present inventors have found that if the solid phase rate is adjusted to approximately 30% or less when in use, the hot steel slag is fluid with which it can be charged into the electric furnace. Note that the solid phase rate can be calculated using commercially available software.
    Initially a description will be given of an arrangement of the slag supplying container according to this embodiment and the electric furnace which melts and reduces the hot steel slag. FIGURE 1 illustrates the arrangement of the slag supplying container according to this embodiment and the electric furnace.
    An electric furnace 1 for processing the reduction of steel slag (hereinafter also referred to simply as an electric furnace 1) is an electric furnace of direct current of the fixed type, and includes the electrode 2 formed by an upper electrode 2a and an electrode of bottom of oven 2b that are paired in the vertical direction. The cast iron 5 is contained in the bottom portion of the electric furnace 1, and in the cast iron 5 a layer of molten slag 6 is formed containing loaded 6 'steel slag from the slag supply vessel 9. The layer of the molten slag 6 is heated with the electrode 2 together with the cast iron 5.
    To the left in the ceiling design of the furnace 1c of the electric furnace 1, there is provided a slag supply side door to the electric furnace 4 through which the hot steel slag 6 'is loaded from the slag supply vessel 9. Once the external air (oxygen or oxygen-containing gas) enters the electric furnace, the oxidation reaction occurs on the surface of the molten slag layer 6, and thus the "total Fe" in the molten slag layer 6 increases, which leads to a decrease in the reduction performance.
    If the external air does not enter the electric oven 1, the interior of the oven is maintained to be a reducing atmosphere. Thus, re-oxidation does not occur on the surface of the molten slag layer 6, the FeO reduction reaction resulting from the C in the molten slag 6 and the cast iron 5 is advanced, and the "total Fe" in the molten slag 6 decreases, which makes it possible to maintain a predetermined low "Fe Fe". For these reasons, it is preferred that the electric furnace 1 is formed in a closed type with which the external air does not enter.
    The interior of the electric furnace 1 is filled with the reducing atmosphere formed by a primary component of CO gas generated due to the reduction reaction and the resulting H2 of the reducing agent (carbon material) charged.
    The electric oven 1 has a side wall 1a provided with a slag hole 7 which discharges the molten slag 6 into a slag pan (not shown) disposed outside the oven, and the side wall of the oven 1b disposed on the other side of the furnace side wall 1a and provided with a race hole 8 which is located at a height lower than the slag bore 7 and discharges the cast iron 5 into a cast iron vat (not shown) disposed outside the furnace.
    To prevent the side wall 1a of the furnace and the side wall 1b of the furnace from being damaged by melting, it is preferred that the slag hole 7 and the race hole 8 are not arranged close to one another in the same side wall of the furnace. oven. It is only necessary that the slag hole 7 and the race hole 8 are spaced apart from a distance which may prevent the side wall of the furnace 1a and the side wall of the furnace 1b from being damaged by the melt.
    The side wall 1a of the oven, the side wall 1b of the oven, and the ceiling 1c of the oven are cooled with an overcoat or by water-spray cooling (not shown).
    The electric furnace 1 has a raw material supply unit (not shown) which provides a reducing agent such as a carbon material and an auxiliary feedstock such as a slag modification agent. The electric furnace 1 can produce the cast iron 5 by melting, reducing and modifying the strut using the auxiliary feedstock described above. The high temperature exhaust gas (hereinafter also referred to as an "electric furnace exhaust gas") generated during the melting and reducing and containing CO and H2 enters the interior of the slag supply vessel 9, which will be described later, from the side port of supplying slag to the electric furnace 4.
    FIGURE 2 illustrates the slag supply container 9 shown in FIGURE 1 in an enlarged manner.
    The slag supply vessel 9 (see FIGURE 1 and FIGURE 2) is configured by an upper wall 11, a lower wall 10, and a side wall (only the side wall 9b is shown in FIGURE 2) disposed between the top wall 11 and the bottom 10, and includes a container body 90 for loading (accommodating) the hot steel slag 6 '.
    In addition, the slag supplying container 9 is provided, in its end portion, with a slag discharge portion 9a so that it can be connected with the slag supply side port 4 to the blast furnace 4. Here, the connection structure between the slag discharge portion 9a of the slag supply vessel 9 and the slag supply side port 4 to the electric furnace 4 is not limited to a specific connection structure. For example, it may be possible to employ a structure in which the slag discharge portion 9a of the slag supply vessel 9 is formed so as to be smaller than the slag supply side port 4 to the electric furnace 4 so that the portion of slag discharge 9a from the slag supply vessel 9 can be inserted into the slag supply side port 4 to the electric furnace 4.
    It is to be noted that it is preferred that the structure of the connection between the discharge portion of the slag 9a of the slag supply vessel 9 and the slag supply side port 4 to the electric furnace 4 is designed so as to be able to maintain the mechanically hermetic state in its connecting portion even if the slag supply vessel 9 is inclined, with the inclination axis Z being the center.
    In addition, the upper wall 11 of the slag supply vessel 9 includes a slag receiving portion 13a for receiving the steel slag 6 'provided, for example, from a slag pan (15 in FIGURE 3), and a cap 13b for opening and closing the slag receiving portion 13a when necessary. The slag receiving portion 13a is closed with the cap 13b when the steel slag 6 'is not provided to prevent outside air from entering. Note that the receiving portion of the slag 13a may be attached to the side wall 9b.
    In addition, the top wall 11 or side wall 9b may be provided with an exhaust portion 13 for expelling exhaust gas from the electric furnace entering through the slag supply side port to the electric furnace 4 through the portion of discharge of slag 9a. In the case where the exhaust portion 13 is connected to a dust collector (not shown), the exhaust gas from the electric furnace of the exhaust portion 13 can be guided to the dust collector, which is preferable. Note that it is preferred that the exhaust portion 13 is spaced from the discharge portion 9a, since with the increase in the distance between the exhaust portion 13 and the slag discharge portion 9a, the slag temperatures in the slag 9 are more likely to be maintained with the exhaust gas from the electric furnace.
    In addition, in the case where the exhaust portion 13 is connected to the dust collector (not shown), the atmosphere in the slag supply vessel 9 may be adjusted to be under negative pressure, which is preferable. In such a state, the electric furnace exhaust gas generated in the electric furnace 1 passes from the slag supply side port to the electric furnace 4 through the discharge portion 9a, and enters the interior of the slag supply vessel 9 (see arrows on FIGURE 2). Then the exhaust gas from the electric furnace passes through the interior of the slag supply vessel 9 which serves as an exhaust path, and enters the dust collector (not shown) from the exhaust portion 13 through a exhaust gas (not shown) (see arrows in FIGURE 2).
    As described above, by using the interior of the slag supply vessel 9 as the exhaust path of the exhaust gas from the electric furnace, it is possible to maintain the interior of the electric furnace 1 to be the reducing atmosphere even in the case where the steel slag 6 'is supplied from the receiving portion of the slag 13a in the slag supply vessel 9, and also to prevent the oxidation reaction from occurring on the surface of the steel slag 6'.
    In addition, although the spaces between the top wall 11 and the bottom wall 10 (the heights of the side walls except for the wall 9b) are not specifically limited, it is preferred that the spaces have a portion that gradually decreases towards the slag discharge portion 9a. This is because this structure makes it possible for the slag supply vessel 9 to have an increased volume from the discharge portion of the slag 9a into the slag supply vessel 9, which leads to the reduction in the size of the equipment. Moreover, with the increase in the extent of this gradually decreasing portion, it is also possible to reduce the size of the slag supply side door to the electric furnace 4, whereby it is possible to easily make the connection with the electric furnace 1. Thus, it is more it is preferred that the spaces are configured to gradually decrease through the entire slag supply vessel 9.
    It should be noted that the width of the container is not specifically limited. However, for the same reason, it is preferred that the width of the container gradually decreases towards the slag discharge portion 9a from the sidewall 9b.
    It is preferred that the lower wall 10 of the slag supply vessel 9 to be formed by a steel shell 10a, the thermal insulation material 10b, and the coated refractory wall. With such a wall configuration, it is possible to minimize the flow of heat passing through the bottom wall 10, and to prevent the steel slag 6 'from adhering to the coated refractory wall.
    On the other hand, it is preferred that the top wall 11 and the side wall 9b are formed by a water-cooled wall, the interior of which is coated with refractory material. By coating the wall with refractory material, it is possible to suppress excessive cooling, and then the potential heat of the refractory material can be effectively used as radiant heat to maintain the temperatures of the steel slag 6 '. As the excessive cooling can be suppressed in the side wall 9b, the suitable amount of the steel slag 6 'is attached to the side wall surface 9b, thereby forming a thin layer of slag. With the slag layer, it is possible to protect the refractory material.
    The slag supplying vessel 9 is provided with a tilting unit (not shown) which can incline the slag supply vessel 9 at angles given with its center being a tilting axis Z arranged in the lower part of the slag supplying portion 9 slag discharge 9a and in the vicinity of the side wall end of the oven 1a of the electric oven 1.
    It is only necessary that the tilting unit is a unit which can tilt the slag supply vessel 9 at angles given with the tilting axis Z being its center, and the tilting unit is not limited to a tilting unit specific. However, it is recommended to employ a tilting mechanism having a vertically movable cylinder installed in the lower portion of the slag supply vessel 9. The amount of steel slag 6 'carried by the slag supply vessel 9 to the electric furnace 1 may be suitably adjusted by measuring the amount of change in mass of the steel slag 6 'in the container body 90 using a weight measuring unit 16 supplied to the wagon 14, and controlling the inclination angle of the delivery container 9 with the based on the measured values. Note that the change in mass of the hot slag 6 'can be obtained by measuring the mass of the slag supply vessel 9 over time. For example, the mass of the slag supply vessel 9 can be measured using, for example, a loading element.
    In addition, it is possible to make the slag supplying vessel 9 function as a way to continuously supply the steel slag 6 'of the slag pan 15 to the electric furnace 1 by fixing the angle of inclination. At that time, the lid 13b of the receiving portion of the slag 13a of the slag supply vessel 9 is opened, and the steel slag 6 'is supplied by the receiving portion of the slag 13a to the slag supply vessel 9 while being carried away from the slag discharge portion 9a from the slag supply vessel 9 to the electric furnace 1. The slag supply vessel 9 may be provided, for example, in the top wall 11 or side wall 9b, with a nozzle 12 which blows oxygen or gas containing oxygen into the exhaust gas of the electric furnace. If the exhaust gas from the electric furnace is burned in the slag supply vessel 9, it is possible to keep the inside of the vessel having high temperatures. By keeping the inside of the vessel at high temperatures, it can be prevented that the steel slag 6 'is solidified and adheres to the furnace walls of the slag supply vessel 9, and it is also possible to make the steel slag 6' favorable fluidity required for the steel slag 6 'to be charged into the electric furnace 1.
    A torch 12a which may emit flame in the slag supply vessel 9 may be provided, for example, to the top wall 11 or the side wall 9b of the slag supply vessel 9 to deal with the case where the temperature of the slag the slag supply vessel does not increase sufficiently, or in the event that, even if the sensitive heat or combustion heat of the exhaust gas from the electric furnace is used, the temperature in the slag supply vessel 9 does not increase to temperatures at which the steel slag 6 'does not adhere to the wall surface of the slag supply vessel 9.
    In addition, a nozzle (not shown) may be supplied to the bottom wall 10 to ensure fluidity to a degree at which the steel slag 6 'does not adhere to the surface of the bottom wall 10. It is preferable to blow an oxygen-containing gas ( for example, a gaseous mixture of N2 + O2) from the nozzle into the vessel to generate a small amount of heat of combustion, and to form a stream of steel slag 6 'while maintaining ventilation within the adhering layer of structure.
    In the case where a slag modifying agent for modifying the steel slag 6 'in the slag supply vessel 9 is added to the slag 6' in the slag supply vessel 9, the slag modifying agent can be charged, e.g. for example through the torch 12a in the slag supply vessel 9 in a molten form.
    The steel slag 6 'is charged into the electric furnace 1 with the slag supply vessel 9 in the following manner.
    A suitable amount (e.g., about 100 to 150 t) of cast iron 5 is previously accommodated in the electric furnace 1 in the form of hot metal. Then the steel slag 6 'having the amount adjusted so as to be able to be reduced in relation to the rate of electrical energy supplied to the electric furnace 1, is continuously or intermittently charged in the molten slag layer 6 in the cast iron 5 while checking the value of the weight of the slag supply vessel 9 so that the layer of molten slag 6 in the electric furnace is maintained continuously.
    By using the slag supply vessel 9 according to this embodiment, it is possible to freely select the mode of receiving the steel slag 6 'from the slag pan and / or how to load the slag 6' in the electric furnace 1 , by activating the tilt unit, and adjusting the inclination angle of the slag supply vessel 9 with the inclination axis Z being the center.
    In other words, by using the slag supply vessel 9 in that embodiment, it is possible to temporarily store and maintain the steel slag 6 'provided by the slag pan 15 by the slope of the slag supply vessel 9 using the tilt unit with the inclination axis Z being the center. In addition, it is possible to continuously or intermittently load the stored steel slag 6 'stored and maintained up to the molten slag layer 6 the cast iron 5 in the electric furnace 1 while adjusting the amount of flow so as not to propagate (overflow) the electric furnace 1 due to the foaming of the molten slag 6. It should be noted that the steel slag 6 'is temporarily stored and maintained in the slag supply vessel 9. However, in the case where the quantity of the slag pan is small and the steel slag 6 'need not be temporarily stored and maintained in the slag supply vessel 9, it may be possible to secure the slag supply vessel 9 to constant slant angles and use it as slag path as described above .
    By tilting the slag supply vessel 9 to load the steel slag 6 'in the electric furnace 1, the high temperature surface layer of the steel slag 6' in the slag supply vessel 9 is updated, thereby the thermal efficiency for the steel slag 6 'remaining in the slag supply vessel 9 improves.
    In the case where the steel slag 6 'is carried intermittently in the electric furnace 1, it may be possible to employ: [0071] a mode in which the steel slag 6' is charged in such a way that the loading and the interruption are repeated , or (ii) a mode in which a predetermined amount of steel slag 6 'is collectively inserted at predetermined time intervals.
    In the case where the loading rate is excessively rapid when the steel slag 6 'is charged into the electric furnace 1, the amount of gas generated temporarily increases, and foaming occurs in the slag, which possibly leads to a such as propagation (overflow) of slag from the electric furnace 1. In such a case, the loading of the steel slag 6 'is temporarily interrupted by the reduction of the inclination angle of the slag supply vessel.
    When the steel slag 6 'is loaded, it is preferable to detect whether the layer of molten slag foam strongly (slag foam) and an abnormality such as overflow occurs, for example, by monitoring: [0075] the inside and outside of the oven using a camera monitor;
    Monitoring the behavior of the steel slag 6 'using a sound meter; and measuring the level of the surface of the slag melted by microwave radiation.
    If the results appear to exceed a lower limit value, it is preferable to control the slope angle of the slag supply vessel 9 to adjust the amount of steel slag 6 'loaded in the electric furnace 1.
    To prevent foam from occurring in the molten slag 6 and preventing the molten slag 6 from spreading (overflowing) into the electric furnace 1, it is effective to employ a method of placing reduced slag in the cast iron 5 in order to function as a zone in addition to adjusting the amount of loaded steel slag 6 'to the slag supply vessel 9. With this method it is possible to reduce the concentration of FeO in the loaded steel slag 6' and decrease the probability that the steel slag 6 ' is brought into contact with the cast iron 5. Thus, the methods described above can be used at the same time.
    Naturally, maintenance is required for the slag supply vessel 9. Thus, it is preferred that the body 90 of the slag supply vessel 9 has a replaceable structure. FIGURE 3 shows a container body mode 90 having a replaceable structure in which a carriage 14 for withdrawing the body from the replacement container 90 is provided in the lower portion of the bottom wall 10. More specifically, the container for dispensing slag 9 is supported with a hydraulic cylinder 14a, which is supplied to the carriage 14 and inclines the slag supply vessel 9, and bearing elements 14b and 14c connected to the inclination axis Z.
    Upon the replacement of the container body 90 of the slag supply vessel 9, the hydraulic cylinder 14a is activated to make the slag supply vessel 9 in a non-slant state, the connection between the slag supply vessel 9 and the electric furnace 1 is disengaged, and the car 14 which carries the slag supply vessel 9 is moved to a predetermined location spaced from the electric furnace 1.
    The maintenance-requiring slag supply vessel 9 is lifted from the carriage 14 using a crane (not shown), and then moved to a maintenance site. Thereafter, a new slag supply container 9 is loaded into the wagon 14 using the crane, and the wagon 14 is moved to a location in which the electric furnace 1 and the slag supply vessel can be connected.
    In the case where the container body 90 of the slag supply vessel 9 is replaced more quickly, two wagons may be used. More specifically, a wagon (A) carrying the container body 90 of a replacement supply slag container 9 is placed in a ready state in a predetermined position. A wagon (B) carrying the container body 90 of the maintenance-requiring slag supply vessel 9 is moved to another predetermined location. The wagon (A) is then moved to a location in which the slag supply vessel 9 and the electric furnace 1 can be connected. As described above, using two wagons, it is possible to replace the container body 90 of the slag supply vessel 9 expeditiously.
    Examples [0086] Examples of the present invention will now be described. The conditions described in the Examples are merely examples of conditions given to confirm the viability and effects of the present invention, and the conditions relating to the present invention are not limited to such exemplary conditions. The present invention may employ various conditions as long as they do not depart from the main points of the present invention and the object of the present invention can be achieved.
    Examples The steel slag discharged from the converter was charged into the slag furnace in a molten state (solid phase rate of not more than 25%), and stored temporarily. The slag supply vessel was then tilted once every 10 minutes to load the steel slag with approximately 8 tons for each load into an electric direct current furnace that accommodates approximately 130 tons and approximately 200 mm thick slag layer cast iron subjected to the reduction process and located above the pig iron.
    It should be noted that the reason for adjusting the amount of loaded steel slag to approximately 8 tons for each load is that it has been confirmed by preliminary experiments using actual equipment that a strong foaming does not occur under that condition.
    The loading rate of the steel slag was adjusted to 800 kg / min on average. This rate was calculated on the basis of the rate of electric energy consumption that is required for the steel slag reduction process and is obtained by the method described above to continuously provide approximately 30 MW of electricity as described below.
    The temperatures in the electric oven were controlled to be cast iron temperatures: 1550 ± 5Ό. One time the electric oven was not supplied with any openings that communicate with the outside air, the inside of the oven was maintained to be a reducing atmosphere. For the electric furnace, approximately 30 MW of electrical power was continuously supplied from the electrode, and powdered carbon material was supplied from a raw material supply tube at a rate of 5 t / hr. As a result, steel slag carried on the molten slag layer was capable of being subjected to the reduction process without causing foaming in the slag.
    This means that in the case where the steel slag is continuously charged at the loading rate of 800 kg / min, the foaming is less likely to occur, and then the reduction processing can be performed continuously for the slag melted without causing overflow. In other words, the example described above is an example to show the continuous loading of the steel slag.
    INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to change the slag having flowability during the heat to the layer of molten slag (reduced slag layer) formed in the cast iron the electric furnace without causing rapid spillage , so that it is possible to maintain the execution of the melt fusion and the reduction process in the electric furnace without fractures. Therefore, the present invention is highly applicable in the steel industry. Brief description of the reference symbols 1 Electric oven 1a, 1b Oven side walls 1c Oven ceiling 2 Electrode 2a Upper electrode 2b Oven bottom electrode 4 Electric furnace slag supply side door 5 Cast iron 6 Slag cast 6 'Slag steel mill 7 Ash nozzle 8 Running hole 9 Slag supplier 9a Slag discharge portion 9b Side wall 10 Bottom wall 10a Steel shell 10b Thermal insulation material 11 Top wall 12 Nozzle 12a Blow torch 13 Exhaust portion 13a Receiving portion of slag 13b Lid 14 Wagon 14a Hydraulic cylinder 14b, 14c Support member 15 Slag pan 16 Weight measuring unit Z Tilt axle CLAIMS
    权利要求:
    Claims (9)
    [1]
    A slag supply vessel (9) of an electric furnace (1) for reducing steel slag (6 '), which causes the hot steel slag (6') to flow into a layer of molten slag (6) in the slag (5) in the electric oven (1) through a slag furnace side door (4), characterized in that the slag furnace (9) comprises: a container body (90) which includes a top wall 11, a bottom wall 10 and a side wall 9b disposed between the top wall 11 and the bottom wall 10, and causes the hot steel slag 6 'to flow to the electric oven (1); a slag discharge portion 9a which is disposed at an end portion of the side wall 9b of the container body 90 and is connected with the slag supply side port to the electric furnace 4; a receiving portion of the slag 13a which is disposed in the side wall 9b or in the upper wall 11 of the container body 90 and receives the supply of the hot steel slag 6 '; a cap (13b) that opens or closes the slag receiving portion (13a); an exhaust portion (13) which is disposed in the container body (90) and discharges the exhaust gas from the electric furnace (1); and a tilt unit which only tilts the container body 90 to adjust the amount of inflow of the hot steel slag 6 'to the slag supply side port 4 to the electric furnace 4; wherein the interior of the slag supply vessel 9 is an exhaust gas exhaust path exhausted from the electric furnace 1 and the electric furnace 1 is a fixed type furnace.
    [2]
    A slag supplying container (9) according to claim 1, characterized in that it includes a portion whose side wall (9b) has a gradually decreasing height in the direction of the slag discharge portion (9a).
    [3]
    A slag supplying container (9) according to claim 1, characterized in that: the top wall (11) or side wall (9b) includes a first gas blowing nozzle which blows oxygen or gas which contains oxygen in the container body (90).
    [4]
    A slag supplying container (9) according to claim 1, characterized in that: the top wall (11) or side wall (9b) includes a torch (12a).
    [5]
    A slag supplying container (9) according to claim 1, characterized in that the top wall (11) or side wall (9b) includes a melting radiation unit which provides a slag modifying agent in a molten form.
    [6]
    A slag supplying container (9) according to claim 1, characterized in that: the lower wall (10) includes a second gas blowing nozzle which blows a gaseous mixture of N2 and O2 into the body of the container (90).
    [7]
    A slag supplying vessel (9) according to claim 1, characterized in that it comprises: a weight measuring unit (16) which measures the amount of change in mass of the hot steel slag (6 '), in the container body (90).
    [8]
    A slag supplying container (9) according to claim 1, characterized in that it comprises: a wagon (14) arranged in the lower part of the bottom wall (10) and used to replace the container body (90). ).
    [9]
    A slag supplying container (9) according to claim 1, characterized in that the exhaust portion (13) is connected to a dust collector.
    类似技术:
    公开号 | 公开日 | 专利标题
    BR112014011858B1|2019-06-25|SCORER SUPPLY CONTAINER FOR USE IN ELECTRICAL OVEN FOR STEEL SCORING REDUCTION PROCESSING
    BR112012009231B1|2021-06-01|HOT METAL REFINING METHOD USING TOP BOOM
    JP2003172584A|2003-06-20|Fine particle blowing device and refining method
    BRPI0401753B1|2014-02-11|Metallurgical Reactor for the Production of Cast Iron
    JP5052416B2|2012-10-17|Gas cupola for metal dissolution
    RU2639078C2|2017-12-19|Method for melting metal material in melting unit and melting plant
    JP2006249563A|2006-09-21|Method for blowing oxygen or oxygen-containing gas in arc furnace
    BR112019010696A2|2019-10-01|electric oven
    JP6036727B2|2016-11-30|Hot metal pretreatment method
    JP2006283065A|2006-10-19|Gas-blowing tuyere
    JP2020139180A|2020-09-03|Slag discharging method and molten metal producing method in an arc-type electric furnace
    JP2020139662A|2020-09-03|Arc type electric furnace, slag-off method for the same and molten metal manufacturing method
    JP2020139661A|2020-09-03|Arc type electric furnace, slag-off method for the same and molten metal manufacturing method
    JP2001074377A|2001-03-23|Method and facility for melting cold iron source
    JP3599571B2|2004-12-08|Hot metal or molten steel processing equipment
    JPH09296205A|1997-11-18|Cooling plate for furnace wall in blast furnace
    BR112020018110A2|2020-12-22|FUSION GROUP FOR STEEL PRODUCTION
    JP2016075423A|2016-05-12|Slug adhesion restricting method for inclination type slug feeding device
    JP2001220618A|2001-08-14|Method for melting cold pig iron source
    JP2008196035A|2008-08-28|Method for melting cold iron source in mixer with channel-type induction heating apparatus
    JPH11248356A|1999-09-14|Method for melting cold ion source and melting facility
    JP2000271707A|2000-10-03|Tundish for plasma-heating molten steel
    JPH11222619A|1999-08-17|Metallic material in furnace opening part of refining vessel and method for preventing erosion of refractory
    JP2002121613A|2002-04-26|Method for melting cold iron and melting facility thereof
    JPH1072607A|1998-03-17|Operation of blast furnace
    同族专利:
    公开号 | 公开日
    KR101531804B1|2015-06-25|
    IN2014DN07281A|2015-04-24|
    US20150135896A1|2015-05-21|
    CN103930573B|2017-04-05|
    EP2757163A1|2014-07-23|
    JPWO2014003123A1|2016-06-02|
    EP2759606A4|2015-07-22|
    CN103930573A|2014-07-16|
    EP2759606B1|2016-11-16|
    EP2757163A4|2015-07-15|
    WO2014003119A1|2014-01-03|
    EP2767597A4|2015-07-15|
    KR20140085506A|2014-07-07|
    IN2014DN07279A|2015-04-24|
    US9534266B2|2017-01-03|
    CA2851963C|2015-05-19|
    CA2851604C|2015-11-10|
    IN2014DN07659A|2015-05-15|
    KR101560513B1|2015-10-14|
    JP5541423B1|2014-07-09|
    CA2852500A1|2014-01-03|
    JP5574057B2|2014-08-20|
    KR20140085499A|2014-07-07|
    CA2851604A1|2014-01-03|
    CN104039987B|2015-07-22|
    CN103930574A|2014-07-16|
    US9238846B2|2016-01-19|
    CA2852500C|2015-06-23|
    KR20140079805A|2014-06-27|
    EP2767597B1|2016-11-02|
    BR112014011428B1|2020-04-14|
    JPWO2014003119A1|2016-06-02|
    BR112014011858A2|2017-05-16|
    CN104039987A|2014-09-10|
    WO2014003123A1|2014-01-03|
    KR101560512B1|2015-10-14|
    EP2767597A1|2014-08-20|
    BR112014011428A2|2017-05-02|
    WO2014003127A1|2014-01-03|
    US20140247856A1|2014-09-04|
    JPWO2014003127A1|2016-06-02|
    US9217185B2|2015-12-22|
    CN103930574B|2015-08-19|
    BR112014011250B1|2019-07-02|
    JP5522320B1|2014-06-18|
    CA2851963A1|2014-01-03|
    EP2759606A1|2014-07-30|
    US20140291901A1|2014-10-02|
    BR112014011250A2|2017-05-09|
    EP2757163B1|2017-03-08|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE1291760B|1963-11-08|1969-04-03|Suedwestfalen Ag Stahlwerke|Process and device for discontinuous and continuous vacuum melting and casting of steel and steel-like alloys |
    US3905589A|1972-03-27|1975-09-16|Pennsylvania Engineering Corp|Steel production method and apparatus|
    US4149024A|1974-07-23|1979-04-10|Asea Aktiebolag|Arc furnace for reducing metal oxides and method for operating such a furnace|
    US4199350A|1975-05-17|1980-04-22|Vacmetal Gesellschaft fur Vakuummetallurgie mbH|Method for the production of quality steels|
    DE2522194A1|1975-05-17|1976-12-02|Vacmetal Gmbh|PROCESS AND DEVICE FOR MANUFACTURING QUALITY STEEL|
    JPS5539603B2|1975-09-10|1980-10-13|
    DE2847403A1|1978-11-02|1980-05-14|Mannesmann Ag|METHOD FOR PRODUCING LOW-CARBON STEEL FROM VANADINE- AND / OR TITANIUM-CONTAINING IRON ORES|
    US4328388A|1980-02-11|1982-05-04|Longenecker Levi S|Electro furnace feeding and furnace fume utilization and control|
    JPS57177911A|1981-04-27|1982-11-01|Kawasaki Steel Corp|Treatment of molten bath to be subjected to dephosphorization regeneration of converter waste slag and recovery of valuable components|
    JPS6337313B2|1983-03-31|1988-07-25|Shinnitsutetsu Kagaku Kk|
    FI72502C|1984-12-21|1987-06-08|Outokumpu Oy|Method and apparatus for producing heat-resistant and / or refractory fiber material.|
    AT384669B|1986-03-17|1987-12-28|Voest Alpine Ag|PLANT FOR PRODUCING STEEL FROM SCRAP|
    US5173920A|1989-08-21|1992-12-22|Asea Brown Boveri Ltd.|Direct-current electric-arc furnace|
    AT395656B|1990-11-19|1993-02-25|Voest Alpine Ind Anlagen|SYSTEM FOR THE PRODUCTION OF LIQUID METALS|
    LU88517A7|1993-12-15|1996-02-01|Wurth Paul Sa|Charging device for an electric oven|
    ZA954458B|1994-06-10|1996-02-13|Mintek|The recovery of metal values from slags|
    FR2731712B1|1995-03-14|1997-04-25|Usinor Sacilor|PROCESS FOR THE PREPARATION OF STEEL IN AN ELECTRIC ARC FURNACE, AND ELECTRIC ARC FURNACE FOR ITS IMPLEMENTATION|
    JP3732561B2|1995-09-29|2006-01-05|中央電気工業株式会社|Simultaneous implementation of iron alloy production and incineration ash melting in an electric furnace|
    AT404942B|1997-06-27|1999-03-25|Voest Alpine Ind Anlagen|PLANT AND METHOD FOR PRODUCING METAL MELT|
    LU90154B1|1997-10-17|1999-04-19|Wurth Paul Sa|Process for the continuous melting of solid metal products|
    JP3796617B2|1998-10-23|2006-07-12|日本坩堝株式会社|Melting and holding furnace such as aluminum ingot|
    JP3644330B2|1999-11-24|2005-04-27|住友金属工業株式会社|Treatment method for reducing slag|
    KR100580347B1|2000-01-28|2006-05-16|홀심 리미티드|Method for treating slags or slag mixtures on an iron bath|
    US6614831B2|2000-02-10|2003-09-02|Process Technology International, Inc.|Mounting arrangement for auxiliary burner or lance|
    DE60126526T2|2000-02-17|2007-11-22|John A. Concord Vallomy|Process for the reduction treatment of liquid slag and filter dust of an electric arc furnace|
    JP2002054812A|2000-08-08|2002-02-20|Nkk Corp|Method for melting incineration ash|
    JP2002069526A|2000-08-28|2002-03-08|Nippon Steel Corp|Method for regeneration treating of dephosphorized slag|
    JP2002069520A|2000-08-29|2002-03-08|Nippon Steel Corp|Method for recovering chromium in slag|
    JP2002069626A|2000-09-06|2002-03-08|Sumitomo Metal Mining Co Ltd|Sputtering target and its production method|
    US6748004B2|2002-07-25|2004-06-08|Air Liquide America, L.P.|Methods and apparatus for improved energy efficient control of an electric arc furnace fume extraction system|
    AT412283B|2003-05-16|2004-12-27|Voest Alpine Ind Anlagen|METHOD FOR RECYCLING SLAG|
    DE10335847A1|2003-07-31|2005-02-17|Sms Demag Ag|Electric arc reduction furnace for reducing slag in the recovery of metallic components comprises a charging opening for charging material which simultaneously acts as an exhaust gas line opening for the gas produced|
    JP2005195224A|2004-01-06|2005-07-21|Nippon Steel Corp|Melting and modifying furnace for steel making slag and its method|
    JP4654886B2|2005-11-11|2011-03-23|Ｊｆｅスチール株式会社|Steelmaking slag recycling method|
    PL1870479T3|2006-02-23|2012-06-29|Primetals Technologies Austria GmbH|Method and facility for continuous further processing of molten slag|
    JP2008049206A|2006-03-30|2008-03-06|Daido Steel Co Ltd|Exhaust gas treatment method|
    DE102006052181A1|2006-11-02|2008-05-08|Sms Demag Ag|A process for the continuous or discontinuous recovery of a metal or metals from a slag containing the metal or compound of the metal|
    BR112014011858B1|2012-06-27|2019-06-25|Nippon Steel & Sumitomo Metal Corporation|SCORER SUPPLY CONTAINER FOR USE IN ELECTRICAL OVEN FOR STEEL SCORING REDUCTION PROCESSING|CN102249567B|2010-09-27|2013-12-04|山东焦化集团有限公司|Method for producing reduced stone raw material utilizing melting slag|
    BR112014011858B1|2012-06-27|2019-06-25|Nippon Steel & Sumitomo Metal Corporation|SCORER SUPPLY CONTAINER FOR USE IN ELECTRICAL OVEN FOR STEEL SCORING REDUCTION PROCESSING|
    EP3026126B8|2013-07-24|2019-07-31|Nippon Steel Corporation|Exhaust gas treatment method|
    EP2843063B1|2013-09-02|2016-07-13|Loesche GmbH|A method for treating a steel slag and a hydraulic mineral binder|
    JP6350189B2|2014-10-06|2018-07-04|新日鐵住金株式会社|Slag adhesion suppression method for tilting slag supply device|
    JP6446970B2|2014-10-06|2019-01-09|新日鐵住金株式会社|Slag adhesion suppression method for tilting slag supply device|
    JP6429190B2|2014-12-16|2018-11-28|新日鐵住金株式会社|Electric furnace for melting steelmaking slag|
    CN105986054A|2015-02-13|2016-10-05|鞍钢股份有限公司|Method for modifying and reducing converter final slag|
    FI127179B|2015-09-15|2017-12-29|OutotecOy|METHOD AND ORGANIZATION FOR MONITORING THE FEATURES PROPERTIES AND PROCESS MONITORING UNIT|
    CN106702043B|2015-11-17|2018-08-03|鞍钢股份有限公司|A kind of converter finishing slag processing method|
    CN106811566B|2015-12-02|2019-02-26|鞍钢股份有限公司|A kind of phosphor-containing steel phosphorus alloy method|
    CN107012283B|2016-01-27|2018-10-09|鞍钢股份有限公司|A kind of remained converter slag method|
    WO2018110174A1|2016-12-16|2018-06-21|新日鐵住金株式会社|Electric furnace|
    EP3557171A4|2016-12-16|2020-05-06|Nippon Steel Corporation|Electric furnace|
    CN106755665A|2017-02-20|2017-05-31|中冶赛迪上海工程技术有限公司|A kind of utilization high-temperature slag processes the device and method of incineration of refuse flyash|
    DE102017105551A1|2017-03-15|2018-09-20|Scholz Austria GmbH|Process for the treatment of metallurgical slags|
    DE102017119675B4|2017-08-28|2019-07-04|Voestalpine Stahl Gmbh|Process for the treatment of slag|
    CN108558244B|2018-05-15|2020-09-01|鞍钢股份有限公司|Device and method for preparing cement mixture by utilizing thermal state converter slag|
    CN109500048A|2018-10-09|2019-03-22|中冶南方工程技术有限公司|The solidification processing method and processing system of incineration of refuse flyash|
    法律状态:
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2018-12-18| B07A| Technical examination (opinion): publication of technical examination (opinion)|
    2019-05-07| B09A| Decision: intention to grant|
    2019-06-25| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 27/06/2013, OBSERVADAS AS CONDICOES LEGAIS. (CO) 20 (VINTE) ANOS CONTADOS A PARTIR DE 27/06/2013, OBSERVADAS AS CONDICOES LEGAIS |
    2019-11-12| B25D| Requested change of name of applicant approved|Owner name: NIPPON STEEL CORPORATION (JP) |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2012-144557|2012-06-27|
    JP2012144557|2012-06-27|
    JP2012-144473|2012-06-27|
    JP2012144473|2012-06-27|
    JP2012235692|2012-10-25|
    JP2012-235692|2012-10-25|
    PCT/JP2013/067660|WO2014003119A1|2012-06-27|2013-06-27|Slag supply container for electric furnace for steel slag reduction|
    [返回顶部]