• 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:
    Pellet-shaped calcium hydroxide forming part of the mixture of flux and ores in electrothermal calcium carbide furnaces is calcined. The pellets are made by granulating or briquetting moist calcium hydroxide, delivered to a sintering grate and conveyed thereon through a heating zone, wherein high temperatures are produced by the combustion of gas, above the grate, and wherein the combustion gas is exhausted, below the grate. The calcium hydroxide pellets are more especially placed on to the grate, covered with a layer of broken limestone and the undried pellets are directly conveyed through the heating zone, in an apparatus for carrying out the process.
    公开号:SU778708A3
    申请号:SU752108162
    申请日:1975-02-14
    公开日:1980-11-07
    发明作者:Штендель Иоахим；Портц Вильхельм；Штраусс Георг；Вайлер Хайнрих；Моорманн Гюнтер；Витт Хорст
    申请人:Хехст Аг (Фирма)；
    IPC主号:
    专利说明:

    (54) METHOD FOR CALCINATING DIPPED CALCIUM HYDROXIDE
    one
    The invention relates to a method for calcining calcium hydroxide, which is used as an integral part of the charge in the electrothermal production of calcium carbide.
    A known method of calcining calcium hydroxide in a rotary kiln, in which the product is recycled again to produce carbide. In this case, calcium hydroxide is obtained in a non-focused form, which entails the need to preliminarily carry out the granulation process 1.
    The closest to the described invention to the technical essence and the achieved results is the method of calcining calcified calcium hydroxide, which consists in the fact that previously carefully dried calcium hydroxide is transported by means of a conveyor through a heating zone, where hot gases with a temperature of 400-500 ° C are fed. .
    The disadvantages of this method are the low productivity (3.0 tons / hour) and the insufficiently high content of the main substance in the product (89% CaO).
    In P T B
    The aim of the invention is to increase the productivity of the process and increase the content of the main substance in the product.
    5 The goal is achieved by preliminarily applying a layer of crushed limestone on the calcined calcium hydroxide and moving it through the heating zone by means of a conveyor belt.
    10, the temperature of the gases above the conveyor is maintained at 1000-1200 ° C, and the temperature of the gases sucked under the conveyor is maintained at 300-400 ° C. Distinctive features of the method
    15 are the coating of the calcified calcium hydroxide with a layer of crushed limestone, and the temperature of the gases above and below the conveyor. The method is carried out as follows.
    The agglomerated calcium hydroxide is continuously fed onto the conveyor belt and is also covered with a layer of continuously supplied crushed limestone. In the zone
    权利要求:
    Claims (2)
    [1]
    25 heating over the conveyor maintain the temperature of 1000-1200 ° C by burning combustible gases, such as hydrogen. The height of the layer of calcium hydroxide and crushed limestone, as well as the speed of the Motion of the belt, is set in such a way that the gases sucked under the conveyor are at a temperature of 300-400 ° C. After passing the heating zone, the calcined product is cooled. Coating calcium hydroxide with a layer of lime causes surface carbonization of the starting material. This prevents the cracking of the calcium hydroxide pieces, which makes it possible to increase the speed of the conveyor belt and thereby increase the productivity of the process. The selected temperature ranges are due to the fact that when the gas temperature above the conveyor is lower and below the conveyor below 300 ° C, the CaO content in the product decreases due to incomplete decarbonization and dehydration. In case of a rise in gas temperature above the conveyor above 1200 ° C and under the conveyor above 400 ° C, sintering of calcinate occurs, which means that the latter is capable of being regenerated and, consequently, the performance of the process as a whole. In addition, in this case damage to the conveyor belt is possible. Example. The process is carried out on a conveyor belt with a mesh belt having a width of 1.5 m. A warming zone length is 8.0 m., And the length is adjacent to the Cooling section on It, at a distance of 3.5 m. To the tape, two meters, speed. 40 m / h, continuously served; Broths & Calcium Hydroxide with an average volume of pieces of 28 cm, and on top of the layer of calcium hydroxide is covered with a layer of crushed limestone with a diameter of pieces of mea. In the heating zone, a temperature of 1000-1200 ° C is maintained over the material being processed, and gases with a temperature of 300-400 ° C are sucked off under the conveyor belt. The bed of agglomerated material is 0.4 m high, and the limestone layer is 0.1 m high. The required temperature is maintained by burning 2500 carbide gas and 2000 mph hydrogen. The result is 14.8 t / h of calcinate containing 90.0% CaO. The technical and economic efficiency of this method consists in removing a larger quantity of a product with a higher quality per unit time. Claims Calcination of Calcined Calcium Hydroxide at High Temperature, including moving it by means of a conveyor through a heating zone, characterized in that, in order to increase the productivity of the process, also increase the content of the main substance in the product, a layer of crushed is applied to the calcined calcium hydroxide. limestone, and the process is carried out while maintaining the temperature of the gases above the conveyor 1000-1200 ° C and the temperature of the gases sucked under the conveyor 300-400 ° C. Sources of information taken into account in the examination 1.R. N. Hall, The Engeneering Journal, Dezember 1951, p. 1176-1182.
    [2]
    2. Forward Germany No. 3125, cl. 80 s, published. 1953 (prototype).
    类似技术:
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    同族专利:
    公开号 | 公开日
    ZA75704B|1976-01-28|
    BE825542A|1975-08-14|
    JPS50118996A|1975-09-18|
    DD117614A5|1976-01-20|
    IN141238B|1977-02-05|
    NO139731C|1979-05-02|
    US3998928A|1976-12-21|
    JPS5732004B2|1982-07-08|
    PL107595B1|1980-02-29|
    NO139731B|1979-01-22|
    NO750492L|1975-08-19|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US1315952A|1919-09-16|Method os producing lime |
    US1710967A|1923-03-05|1929-04-30|Dittlinger Crow Company|Process of calcining alkaline earth materials|
    US1688422A|1925-04-04|1928-10-23|Dwight & Lloyd Metallurg Compa|Process of treating earthy minerals|
    US1684958A|1925-04-30|1928-09-18|Dwight & Lloyd Metallurg Compa|Process of treating fines of earthy minerals|
    US2923539A|1956-05-02|1960-02-02|Dravo Corp|Calcining or like process|US4609536A|1985-03-22|1986-09-02|Conoco Inc.|Method for producing reactive lime and reducing sulfur dioxide|
    US4744961A|1985-04-25|1988-05-17|United States Gypsum Company|Submerged combustion calcination|
    WO1997049998A1|1996-06-26|1997-12-31|Simon Fraser University|Accelerometer without proof mass|
    US6589433B2|1996-06-26|2003-07-08|Simon Fraser University|Accelerometer without proof mass|
    US6182509B1|1996-06-26|2001-02-06|Simon Fraser University|Accelerometer without proof mass|
    DE102009045278B4|2009-10-02|2011-12-15|Dirk Dombrowski|Mineral granular desulphurising agent based on calcium hydroxide, process for its preparation and its use|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE2407506A|DE2407506C3|1974-02-16|1974-02-16|Method and device for calcining hydrated lime moldings|
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