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Process for preparing cryolite
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A cryolite and clay technology, applied in aluminum fluoride, aluminum halide and other directions, can solve problems such as pollution of clay salt brine method, and achieve the effect of reducing production cost, high utilization value and reducing consumption
Inactive Publication Date: 2011-02-16
DO FLUORIDE CHEM CO LTD
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[0004] The purpose of the present invention is to provide a method for producing cryolite to reduce production costs and solve the pollution problem of the current clay brine method
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Embodiment 1
[0019] The production method of cryolite of the present invention is raw material with hydrofluoric acid, clay, sodium chloride, comprises the following steps:
[0020] (1) Clay clinker is leached at a temperature of 80°C with a cryolite hydrochloric acid mother liquor with a concentration of 20%, that is, the clay calcined at 800°C. After the leaching is qualified, it is filtered to obtain chlorine with an aluminum ion concentration of 40g / l. Aluminum solution;
[0021] (2) Then, the aluminum chloride solution, hydrofluoric acid, and solid industrial salt obtained by the reaction are added into the synthesis tank simultaneously according to the reaction ratio, and the feed time is 30 minutes. After the feed is finished, the reaction is performed again. 30 minutes;
[0022] (3) The synthetic cryolite slurry is filtered to obtain sandy cryolite ointment, which is washed with hot water and dried to obtain the cryolite product;
[0027] The production method of cryolite of the present invention is raw material with hydrofluoric acid, clay, sodium chloride, comprises the following steps:
[0028] (1) Use cryolite hydrochloric acid mother liquor with a concentration of 22% to leach clay clinker at a temperature of 90°C. The clay clinker here is clay calcined at 800°C. After the leaching is qualified, aluminum ions are obtained by filtration Aluminum chloride solution with a concentration of 45g / l;
[0029] (2) Then the aluminum chloride solution, hydrofluoric acid, and solid industrial salt prepared by the reaction are added into the synthesis tank simultaneously by these three kinds of materials according to the proportioning ratio, and the feed time is 40 minutes, and then reacted for 40 minutes after the feed is finished. ;
[0030] (3) The synthetic cryolite slurry is filtered to obtain sandy cryolite ointment, which is washed with hot water and dried to obtain the cryolite product;
[0031] (4) Pa...
Embodiment 3
[0034] The production method of cryolite of the present invention is raw material with hydrofluoric acid, clay, sodium chloride, comprises the following steps:
[0035] (1) Use cryolite hydrochloric acid mother liquor with a concentration of 25% to leach clay clinker at a temperature of 100°C. The clay clinker here is clay calcined at 800°C. After the leaching is qualified, aluminum ions are obtained by filtration Aluminum chloride solution with a concentration of 50g / l;
[0036] (2) Aluminum chloride solution, hydrofluoric acid, solid industrial salt are then handed over by the reaction proportion and three kinds of materials are simultaneously added in the synthesis tank to be synthesized in parallel flow, the feeding time is 50 minutes, and the feeding is finished and then reacted for 50 minutes;
[0037] (3) The synthetic cryolite slurry is filtered to obtain sandy cryolite ointment, which is washed with hot water and dried to obtain the cryolite product;
[0038] (4) Par...
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Abstract
The invention relates to a method for producing cryolite, which takes hydrofluoric acid, clay and sodiumchloride as raw materials and comprises steps as follows: (1) hydrochloric acidcryolite mother solution with 20 percent to 25 percent of concentration is used for leaching clay clinker at the temperature of 80 DEG C to 100 DEG C; after the qualification of the leaching, aluminum chloride solution with 40g / l to 50g / l of aluminum iron concentration is obtained after filtration; (2) then, the aluminum chloride solution, the hydrofluoric acid and solid industrial salt are flowed into a synthesizing groove for synthesizing according to the reaction proportion, the material feeding time is 30min to 60min and then the reaction is carried out for 30min to 60min after the material feeding; (3)the synthesized cryoliteslurry is filtered for obtaining sand-shaped cryolite runny paste which is washed by hot water and dried to obtain the cryolite product. The method of the invention has the advantages that: (1) the amount of the hydrochloric acid mother solution is small, each ton of cryolite produces 5 square meter of mother solution; wherein, 3 square meter to 4 square meter is recycledand 1 square meter to 2 square meter is byproduct; (2) as the amount of the hydrochloric acid mother solution is small, fluorine and sodium contained are few and the yield coefficient of the main product is high; (3) the byproduct of the hydrochloric acid mother solution has high content, wherein, the content of hydrogen chloride is 20 percent to 25 percent, thus having high utilization value.
Description
technical field [0001] The invention relates to a method for producing cryolite, in particular to a method for producing cryolite with hydrofluoric acid, clay and sodium chloride as raw materials. Background technique [0002] Cryolite is mainly used as a flux for aluminum smelting, and can also be used as a pesticide for crops, an opalescent agent for enamel, an opacifier and a flux for glass and enamel production, and a wear-resistant filler for resin rubber. It can also be used in the production of ferroalloys and ebullient steel. Cryolite has a small amount of natural deposits. At present, the world's aluminum smelting industry mainly uses artificial cryolite. The industrial production methods of cryolite mainly include soda aluminofluoric acid method, clay brine method, sodium fluorosilicate production of cryolite and co-production of white carbon black, etc. The raw materials of the clay brine method are clay mineral powder, salt and hydrofluoric acid. The aluminum i...
Claims
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Application Information
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