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Cryolite production process

A production process, cryolite technology, applied in the field of minerals, to achieve the effect of reducing production costs, slow shrinkage, and small changes

Inactive Publication Date: 2017-08-29
CHANGNING HUAJUN RENEWABLE RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both wet and dry synthetic cryolites have major defects. The intermediate material hydrogen fluoride gas is highly corrosive and toxic, which puts forward high requirements for the selection of production equipment and environmental protection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Pulping: Put 1.5t of alumina slag and appropriate amount of recycled water into the pulping tank to stir and make pulp. The reused water comes from the third-stage sedimentation tank and the treated water in the fifth-stage sedimentation tank is pumped up for reuse.

[0019] 2. Reaction: After the material is pulped, it is sent to the reaction tank, and the tank is heated to 80°C with steam, and 0.06t of 98% concentrated sulfuric acid and 3.5t of brine are added to keep the pH value of the reaction environment at about 4, and the reaction is stirred for 1.5 hours .

[0020] 3. Filtration and washing: After the reaction, the materials are centrifuged, and the separated mother liquor is used for ammonium sulfate production. The separated solid is crude cryolite, which is then washed and dehydrated to obtain wet cryolite (about 10% water content); the separated washing liquid is reused in the pulping process.

[0021] 4. Drying of cryolite: The wet product of cryolite ...

Embodiment 2

[0027] 1. Pulping: Put 1500t of alumina slag and the corresponding amount of recycled water into the pulping tank to stir and make pulp. The reused water comes from the third-stage sedimentation tank and the treated water in the fifth-stage sedimentation tank is lifted by the pump for reuse.

[0028] 2. Reaction: After the material is pulped, it is sent to the reaction tank, heated to 90°C by passing steam into the tank, and 60t of concentrated sulfuric acid and 3500t of brine are added to keep the pH value of the reaction environment at about 4, and the reaction is stirred for 1.5 hours.

[0029] 3. Filtration and washing: After the reaction, the materials are centrifuged, and the separated mother liquor is used for ammonium sulfate production. The separated solid is crude cryolite, which is then washed and dehydrated to obtain wet cryolite (about 10% water content); the separated washing liquid is reused in the pulping process.

[0030] 4. Drying of cryolite: The wet product...

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Abstract

The invention relates to a cryolite production process, which comprises: 1) preparing a slurry; 2) carrying out a reaction; and 3) filtering, carrying out water washing, separating to obtain a mother liquor, a cryolite crude product and a washing liquid, and respectively treating. According to the present invention, the process is simple, and the performances of the prepared cryolite are excellent; the produced cryolite has characteristics of stable electrolysis, slow shrinkage and mild molecular ratio change, and can stably maintain the electrolyte components; the sodium absorption on the cathode is uniform so as to prolong the service life of the electrolytic cell; the electrolysis temperature is reasonable and is changed little so as to be easily controlled; the volatilization loss is low, and the site operating conditions can be effectively improved; and with the production process, the consumption of sodium fluoride or soda ash can be substantially saved, the production cost can be reduced, the used adding method is simple, and the operation is easy to perform.

Description

technical field [0001] The invention relates to minerals, in particular to a cryolite production process. Background technique [0002] Cryolite, also known as sodium fluoroaluminate or sodium aluminum fluoride, is mainly used as a flux for aluminum electrolysis; it is also used as a wear-resistant additive for grinding products, which can effectively improve the wear resistance, cutting and cutting force of the grinding wheel, and prolong the service life of the grinding wheel and storage time; fluxes for ferroalloys and boiling steels, fluxes for non-ferrous metals, deoxidizers for casting, olefin polymerization catalysts, emulsifiers for anti-reflective coatings on glass, enamel, opalescent agents for glass, fluxes for welding materials, Filling agents in the ceramic industry, insecticides in pesticides and other industries and enterprises. [0003] Natural cryolite reserves are very small, and most of the cryolite used are artificially synthesized. At present, there ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54
CPCC01F7/54
Inventor 马晓文
Owner CHANGNING HUAJUN RENEWABLE RESOURCES
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