Preparation method of cryolite

A technology of cryolite and membrane distillation, applied in chemical instruments and methods, water/sludge/sewage treatment, aluminum halide, etc., to achieve slow shrinkage, uniform sodium absorption, and easy control

Inactive Publication Date: 2018-10-26
衡东合兴化工有限责任公司
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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

[0030] 1. Pulping: Put 1.5t of alumina slag and water into the pulping tank and stir to make slurry;

[0031] 2. Reaction: Send the slurry prepared in step 1 to the reaction tank, pass steam into the reaction tank and heat to 80°C, add concentrated sulfuric acid and brine to keep the pH value of the reaction environment at 2.5, and stir the reaction to the end;

[0032] 3. Centrifugal separation: After the reaction, the material is subjected to centrifugal separation, and the crude cryolite and filtrate are separated.

[0033] 4. The crude cryolite separated in step 3 is eluted with water to obtain a wet cryolite product with a water content of about 10%; the wet cryolite product is finally dried with hot air to obtain a cryolite product; the eluted water is combined with the filtrate of step 3 ;

[0034] 5. Precipitation: send the filtrate of step 3 and the eluting water of step 4 into the sedimentation tank together for precipitation, and the recovered water contains a smal...

Embodiment 2

[0043] 1. Pulping: Put 1.5t of alumina slag and water into the pulping tank and stir to make slurry;

[0044] 2. Reaction: Send the slurry prepared in step 1 to the reaction tank, pass steam into the reaction tank and heat to 80°C, add concentrated sulfuric acid and brine to keep the pH value of the reaction environment at 3, and stir the reaction to the end;

[0045] 3. Centrifugal separation: After the reaction, the material is subjected to centrifugal separation, and the crude cryolite and filtrate are separated.

[0046] 4. The crude cryolite separated in step 3 is eluted with water to obtain a wet cryolite product with a water content of about 10%; the wet cryolite product is finally dried with hot air to obtain a cryolite product; the eluted water is combined with the filtrate of step 3 ;

[0047] 5. Precipitation: Send the filtrate of step 3 and the eluting water of step 4 into the sedimentation tank together for precipitation, and the recovered water contains a small ...

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PUM

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Abstract

The invention discloses a preparation method of. The preparation method includes following steps: 1), pulping; 2), reacting; 3), centrifugally separating; 4), eluting and drying a cryolite crude product separated out in the step 3) to obtain a cryolite product; 5), precipitating; 6), treating wastewater. Sodium fluoride or sodium carbonate can be saved greatly, product cost is lowered, and an adding method which is used is simple and easy in operation. In addition, the preparation method is free of wastewater discharge.

Description

technical field [0001] The invention relates to the technical field of mineral preparation, in particular to a method for preparing cryolite. 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 and cutting force of the grinding wheel, and prolong the service life and storage time of the grinding wheel ; Ferroalloy and boiling steel flux, non-ferrous metal flux, casting deoxidizer, olefin polymerization catalyst, and anti-reflective coating for glass, emulsifier for enamel, glass opalescent agent, flux for welding materials, ceramic industry Filling agents, pesticides, 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 are two cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54C02F9/10
CPCC01F7/54C02F1/048C02F1/445C02F1/447C02F1/66C02F9/00C02F2301/046
Inventor 赵鹏陈志平李亮
Owner 衡东合兴化工有限责任公司
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