• 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:
    Regeneration of clay-bonded used foundry sand for reuse instead of new sand. A dry mass of used sand is rubbed for such a length of time, is accelerated suddenly and delayed, and is freed continuously of fine components, until the fine matter, active bonding clay and oolitization degree fall below certain threshold values such that the regenerated product substantially gains the characteristics of new sand. An apparatus for regeneration treatment contains a horizontal revolving sand drum (10), an impact rotor (30) disposed inside said drum in the area of the fall stream (46) of the used sand and a pneumatic dust removal device (36) disposed in the inside of the drum. A chemical secondary treatment of the regenerated product can be carried out advantageously in the same installation in order to bind remaining fine matter to the surface of the grains of sand and simultaneously to seal the pores of the grains.
    公开号:SU1055322A3
    申请号:SU792750752
    申请日:1979-04-13
    公开日:1983-11-15
    发明作者:Хофманн Франц；Затмер Франц
    申请人:Георг Фишер А.Г. (Фирма)；
    IPC主号:
    专利说明:

    2, A device for the regeneration of foundry sand-clay molding compounds containing a rotary around a horizontal axis driven drum, loading device, mixing body and suction device, characterized in that, in order to improve the efficiency and efficiency of the regeneration process, it is equipped with a percussion mechanism installed inside the drum
    coaxially the axis of the drum and made in the form of rotating blades.
    3. The device according to claim 2, distinguished by the fact that the suction device is located between the rotatable wall of the drum and the percussion mechanism.
    k. Device on PP. 2 and 3, in that it is provided with a sprinkler for supplying the treatment liquid installed inside the drum.
    The invention relates to technology and equipment for the regeneration of foundry sand and clay molding sands. The known method and equipment for the regeneration of molding compounds and 2. According to the technology, the used molding mixture is first crushed, then calcined at 550 1300 ° C, and then subjected to cleaning by rubbing the grains together in a mechanical and (or) pneumatic way. The disadvantage of this technology is caused by the use of a significant amount of equipment through which the material being processed passes successively, high energy consumption, especially during calcination. In addition, it is not known whether even after the previous calcination, the clay shells burnt on the grains can be sufficiently removed only by friction. The closest to the invention to the technical essence and the achieved result is a structure for the regeneration of foundry sand-clay molding mixtures, containing a rotating drum around a horizontal axis with a drive, a loading device, a mixing body and suction devices 3. The purpose of the invention is to increase the efficiency and effectiveness of the regeneration process. The goal is achieved by the method of regeneration of foundry sand-clay molding mixtures, including mechanical mixing of the regenerable molding sand, vidi work unit and suction of air from the drum during the mixing of the regenerated molding sand mixture subjected to chemical treatment. A device for the regeneration of foundry sand-clay molding mixtures containing a rotary around a horizontal axis driven drum, a loading device, a mixing body and a suction device, which is equipped with a shock mechanism installed inside the drum coaxially with the axis of the drum and made in the form of rotatable blades. The suction device is located between the rotating wall of the drum and the percussion mechanism. The device is equipped with a sprinkler for feeding the treatment fluid installed inside the drum. FIG. 1 shows a device, a vertical section (perpendicular to the axis of the drum); in fig. 2 - section A-A in FIG. 1, A combined blow and cleaning treatment with simultaneous dust collection can be carried out in one installation without repeatedly pouring sand in different aggregates. The previous crushing of lumps and especially the calcination become unnecessary. The method is carried out in portions, the continuous process did not give one good results. After machining, it is advisable to subject the sand to a subsequent chemical treatment, as a result of which the residual fines adhere to the surface of the cleaned sand grains and thus close the micropores of the grains. Such a post-treatment is carried out in the same device
    G1 with a shock treatment, the lumps of the used molding sand are quickly crushed and then as a result of multiple intensities; For rapid acceleration, deceleration, and cleaning, brittle burnt clay shells are ground from sand grains. By dry cleaning, relatively soft sludges are present in the dried and bound state, and soft grains of carbonaceous components are first ground into powder, with the purpose of separating the fractions from the compact sand grains by air separation. Further, under the effect of cleaning, gradual rounding up of this multifaceted sand grains takes place. It is important that the separation of sludge and the production of constant dust be carried out continuously, since during the machining there is a large yield of such powder components and too large a proportion of the sand would reduce shock and cleaning effort
    0 (5 it was found that the indicated combined boundary conditions for the properties of the regenerated molding sand, namely: less than 2% of sludge (ie fractions of 20 m, less than 1% of active clay bond (both values are relative to the weight of the main mass), less than 8 The% formation of oolite grains is the minimum condition for successful reuse instead of fresh sand, so that 40 conventional chemical binders do not lose their effectiveness and their consumption is within economically acceptable limits. (The degree of formation of oolite op Yedelev is burnt as a fraction of 45 oolite clayey binder shells, fixed on the grains of sand, with respect to the washed and calcined at a sand fraction 20fU} 50
    In certain cases, it is advisable to set boundary conditions for loss on ignition due to coal dust, and extend the time of the regenerating treatment to 55 times, while in the spent molding sand there will be less than 1.5.
    these boundary conditions are different according to the data in the sand and are calculated by simple experiments. As a rule, during processing, not all boundary values are maintained simultaneously. In some cases, the cost of processing can be reduced by first stopping the mechanical treatment (shock and / or cleaning) and still continuing to release fine fractions (dust removal). For reuse, in particular with regard to the need for bonding agents, it is advisable to further reduce the content of sludge and clay binder below specified limits. Dry dusting, such as air separation, increases costs, and disproportionately increases processing time. The subsequent chemical treatment after dry regeneration is expedient, not only the fines are completely removed as a result of their binding on the surfaces of the grains, but the oolitic remains of the shells are also closed.
    Thus, the waste molding mixture is regenerated to such an extent that it is only slightly different in composition and structure from good fresh sand. The amount of linseed oil is used as a measure of the consumption of binding substances, primarily from the point of view of economy and technical use. in the sand sample, which is necessary to obtain compressive strength, LLP of kiloton / cm of standard test specimens, treated in an oven for 2 hours at 230 ° C and then cooled in a desiccator. 1.4-1.5 linseed oil is required for the best quartz sands, and the values obtained by comparison with them in regenerated molding mixtures provide an estimate of the economics of the regenerating treatment.
    Active bentonite is quite hygroscopic and at room temperature absorbs 10-15 moisture from the circulating air, as a result of which it becomes soapy and oily. In the hot, dry state it is, on the contrary, hard brittle and easily cleaned, therefore the condition of a successful regenerating treatment, especially good dust control is a sufficient degree of dryness of the material being processed. This is usually done at a temperature of spent sand of 50-150 ° C at the beginning of the treatment. Here, it is advantageous to use heat to pour from the previous process of using waste sand of Otherwise, when it takes a long time between unloading and regeneration, it is advisable to preheat portions of the used sand to the specified temperature range, but preferably not higher. It has been found that the sand, prior to the cleaning treatment, heats up itself from the heat of friction. As a rule, the regenerated molding mixture is used with the addition of a certain amount of sown sand and mainly used in the manufacture of rods used with chemically hardening inorganic or organic bonds used in it. Usually, the regenerate is reused in the same process as the spent-molding mixes. However, depending on the economic conditions, it can be used in another process, since in addition to the problem of fresh sand preparation (costs, suitable sources), costs and difficulties associated with the elimination of used molding sands can also be significant for regeneration of used molding sands. environmental problems. As a product, perejriepaT, due to the non-eliminated completely spent molding mixture, primarily due to residual ooliths, may have better properties for casting, for example, a smaller tendency to defects caused by expansion, than cracking, compared to fresh quartz sand. from heating, to burning, as well as significantly reduced intergranular porosity and a casing of residual fine fractions fixed on the grain surface, as a result of possible subsequent chemical treatment, Waste regeneration method It is implemented as follows. The table explains the effect of the described regenerating processing of two used molding compounds B and C from various foundries. In the regeneration device, a combined blow treatment and cleaning are carried out with continuous dedusting for 15 minutes, then 5 minutes only dust precipitation. After this, subsequent chemical treatment is carried out, as a result of which the need for flax asle is once again significantly reduced. Total losses at V 1.85 calcination,% N 0.1 0.5 Degree of education - V 16.2 10.0 ni oolite N 8.0 2.2 Content of St - V 4,1 5,3 benzene-bento N 0.8 0.8 nit,% Requirement N 2.4 1.3 linseed oil Subsequent chemical treatment (additives in mm per 100 kg of sand) Concentrated phosphoric acid for pre-neutralization 60 Phenolic resin 800 C 800 800 Para-toluenesulphonic acid 300 Oil demand for oil second processing otrebnost 1.35% in linseed oil th application kvarevogo fresh sand (comparison), 1,1 1,25 V - a state before machining; .N - condition after mechanical, but before subsequent chemical treatment, binder phenolic resin for subsequent processing is overlaid with para-toluenesulfonic acid additives or with acidic substances in sand already in a cold state, soaks the existing pores of sand grains and focuses residual fines on the surface grains of sand. Sand C has better conditions for regeneration: rather short mechanical treatment without the following chemical treatment. Subsequent chemical treatment consists in the fact that sand after mechanical treatment is intensively mixed with impregnating and fixing liquid, the amount of which corresponds to its water absorbing ability. The fine fractions evenly cover the grains are fixed in the form of a smooth shell, becoming solid .4 .-. an integral part of the grain; therefore, they do not mix with the added binders and cannot chemically and / or physically affect it. Thus, subsequent processing provides the neutralization of sand, if necessary, and the fixation of residual dust in order to make it compatible with chemical binders, as well as to improve the hygiene of labor. For processing, you can use inorganic or organic substances that are hardened in cold or hot conditions are economically preferable systems that are cured in a cold state. Concentrated phosphoric acids with the addition of aluminum hydroxide and / or drying the processed sand at 300–350 0, and a solution of aluminum monophosphate with an addition of aluminum hydroxide and / or subsequent drying at 300–350 ° C. Methods of treatment with phosphoric acids and mo; aluminum phosphate can also be combined with each other. Then, liquid glass is taken into account, followed by drying of the sand being treated, and at the same time in acid sand, a neutralizing effect is achieved, cold-hardening synthetic resin- hardening with acids, such as para-toluo sulfonic acids or phosphoric acids, used in foundries as binding substances sand, organic nesting agents of all kinds, followed by air drying or hot drying to remove solvent and inorganic adhesives, for example siliceous brines. In many cases, it is sufficient to fix residual sludge remaining on the sand grains after cleaning with a small amount of water (this is most economical to do in the drum in accordance with the invention). The drawing shows a regenerant C / A device. The regenerating device, operating in batches, contains a cylindrical drum 1 with a lying, preferably horizontal axis, which is provided around the perimeter with a door 2 for loading and unloading a portion of the used molding sand 3. The drum} rests on drive rollers A, 5 of which are mounted in racks 6 on bearings and are driven in rotation by the engine 7 through the gearbox 8. Coaxially with the drum axis at the base 9 on both sides of the drum fixed hollow axles are installed in the form of pipe sections 10 and 11. On each, cutter pipe 10 and 11 are installed Enes disks 12 of sheet metal, each in the plane of the end walls of the drum. Both disks 12 close the corresponding-. a circular cutout in the form of a circle in each end wall of the drum, and the circular target is blocked by a corresponding seal, for example, a ring rubber tape 13 fixed from the inside on the corresponding disk 12. In both sections of pipes 10 and 11, shaft 15 is mounted on bearings, driven by a relatively high number of revolutions, on which inside the drum 1 a percussion instrument 16 is installed, in which the parallel axes of the percussion rods rotate in the same or (better) direction opposite to the drum (see double arrow in fig. 1). In the upper part of the drum 1, there is a fixed ejector 17, which is passing around, the inner wall of the drum parallel to the generating line and provided with side sheets 18. Between the percussion instrument 16 and the ejector 17, preferably attached to it, a dust collecting device is installed in the form of a suction duct 19. The ejector 17 suction duct 19 leaving suction pipe 20, as well as radial strut 21, advantageously form a rigid block that is rigidly connected to both fixed sections of pipes 10 and 1 K sasyvayuscha pipe 20 enters inside the tube segment 11, through the filter 22 which is connected to the blower 23 is produced boiling suction airflow at a suction box 19 in one embodiment, the diverter is not set; sand thus falls on the rotor. Drive engines 7 and 15 as well as blower 23 can be switched on and off separately in accordance with the requirements of operation. In the rotating drum 1 from the dry molding sand 3 lying in the lower part of the drum upwards a layer of sand rises 2A under the action of centrifugal force and internal friction. The number of revolutions of the drum must be such as to ensure the seizure of sand. When a layer of sand 2k hits the retractile 17, it separates from the drum wall and flows to the feed streams 25 down to the drum axis. The feed stream then enters the impact traverse zone of the rapidly rotating shock; tool 16 and is thrown as a jet 26 outward onto the wall the drum is on and from there goes down again. Thus, the mass of the used molding mixture is in the drum in constant rotation. When a incident flow 25 collides with a percussion mechanism, the sand gets a strong acceleration in the form of a shock, and when it collides with the inner wall of the drum, it accordingly receives a strong deceleration in the form of a shock. constantly repeated, since the mass of sand during the processing from 1 / to 1 h makes a large number of revolutions. Moreover, during the rotation of wacca sand it is intensively cleaned by constantly moving the Sand Grains to each other. ha, rubbing against the drum wall and above all thanks to the turning of a layer of sand 2k on the dumper and upon striking the impact beam onto a bag of sand from a falling stream 25 Dust forming in the sand mass during this mechanical treatment is continuously released described1 22. 10 pneumatic the dust collecting device and is collected in the filter 22; Especially beneficial for efficient dust collecting is the installation of the suction box 19 with suction holes near the incident stream 25, resulting in an air separator and from the loosened mass of sand. The intake air can enter the drum through seals made in the form of dampers and through pipe 10 or through special inlets (not shown), preferably in washers 27. Example The device has an internal drum diameter of 1 m and 0.6 m of a percussion mechanism When the drum speed is 0'7s, the circumferential speed of sand on the drum is about 2.2 m / s and the speed of the percussion mechanism is 2.7 seconds. The velocity of the impact of the traverse on the sand is approximately m / s. This circumferential speed is decisive for the impact force. accelerated and then to slow down when the sand hits the drum, and in any case should be at least about 30 m / s. After sufficient mechanical machining of the sand, it is advisable to stop the impact mechanism and continue dedusting for some time while the drum is rotating. If necessary, subsequent chemical treatment can also be carried out in the drum 1. sand, preferably in the form of a nozzle, which is mounted in the incident flow zone 25 With this spraying device you can easily distribute the required amount of liquid in a portion of sand with the percussion mechanism stopped and the pneumatic dust collector off, but with a drum K as J1para, the amount of liquid so small that it is completely absorbed by the micropores of the sand grains and residual sludge fractions, so the sand retains flowability. W // 7 // // 7 / Y // 27ff 5 FIG. 20
    权利要求:
    Claims (4)
    [1]
    METHOD FOR REGENERATING CASTING SAND-CLAY MOLDING MIXTURES AND A DEVICE FOR ITS IMPLEMENTATION (57) 1 ”A method for regenerating foundry sand-clay moldable mixtures, which involves mechanical mixing of the regenerated molding mixture by rotation of the working body and air extraction from the drum, which differs in order to increase air from the drum the efficiency and economy of the regeneration process, during the mixing of the regenerated molding sand, it is subjected to chemical treatment. . .
    1DM322
    [2]
    2. A device for the regeneration of foundry sand-clay molding sand, containing a drum with a drive rotating around a horizontal axis, a loading device, a stirring body and a suction device, characterized in that, in order to increase the efficiency and economy of the regeneration process, it is equipped with a shock a mechanism installed coaxially inside the drum, the axis of the drum and made in the form of rotatable blades.
    [3]
    3. The device pop.2, distinguished by the fact that the suction device is located between the rotatable wall of the drum and the percussion mechanism.
    [4]
    4. The device according to paragraphs. 2 and 3, characterized in that it is provided with a sprayer for supplying the treatment fluid installed inside the drum.
    类似技术:
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    同族专利:
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    JPS54138815A|1979-10-27|
    GB2018650A|1979-10-24|
    FI791057A|1979-10-15|
    DE2909408C2|1984-10-11|
    DK154873B|1989-01-02|
    ATA163379A|1986-02-15|
    DD143561A5|1980-09-03|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH401178A|CH631643A5|1978-04-14|1978-04-14|METHOD FOR REGENERATING OLD FOUNDRY SAND AND DEVICE FOR CARRYING OUT THE METHOD AND PRODUCT OF THE METHOD.|
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