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A production process of pure cryolite

A production process, cryolite technology, applied in the direction of aluminum fluoride, aluminum halide, ammonium chloride, etc., to achieve the effect of simple addition method, reasonable electrolysis temperature, and less volatilization loss

Inactive Publication Date: 2018-12-14
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

[0024] 1. Pulping: Put 1.5t of alumina slag and water into the pulping tank and stir to make slurry;

[0025] 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;

[0026] 3. Centrifugal separation: After the reaction, the material is subjected to centrifugal separation, and the crude cryolite and filtrate are separated.

[0027] 4. Purification: The crude cryolite separated in step 3 is mixed with water at a solid-to-liquid ratio of 1:10 to make slurry or added to the reactor, heated to 100°C, and the pH value of the solution is slowly adjusted to 8 with sodium carbonate solution, and the stirring is controlled The speed of the filter is 500rpm, filter after 30 minutes of reaction time, wash the filter cake three times with sodium carbonate solution, mix the filter cake and wate...

Embodiment 2

[0031] 1. Pulping: Put 1.5t of alumina slag and water into the pulping tank and stir to make slurry;

[0032] 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;

[0033] 3. Centrifugal separation: After the reaction, the material is subjected to centrifugal separation, and the crude cryolite and filtrate are separated.

[0034] 4. Purification: The crude cryolite separated in step 3 is mixed with water at a solid-to-liquid ratio of 1:20 to make slurry or added to the reactor, heated to 85°C, slowly adjusting the pH value of the solution to 8.5 with sodium carbonate solution, and controlled stirring The speed of the filter is 650rpm, filter after 50 minutes of reaction time, wash the filter cake three times with sodium carbonate solution, mix the filter cake and water according to...

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PUM

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Abstract

A production process of pure cryolite is disclosed. The process includes 1) pulping, 2) reaction, 3) centrifugal separation, 4) purification, 5) precipitation and 6) wastewater treatment. The processis simple and the produced cryolite is excellent in performance. The produced cryolite is stable in electrolysis, low in shrinkage, and smooth in molecular ratio change, and facilitates electrolyte stabilization. A cathode absorbs sodium evenly, thus prolonging the service lifetime of an electrolysis cell. An electrolysis temperature is reasonable, small in change and easy to control. Volatilization loss is low and on-site operation conditions can be effectively improved. The process can save a high amount of sodium fluoride or sodium carbonate, and reduces the production cost, and an additionmethod is simple and easy to operate. The process is free of wastewater emission and produces ammonium chloride as a byproduct.

Description

technical field [0001] The invention relates to the technical field of mineral preparation, in particular to a production process of pure 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54C01C1/16
CPCC01C1/164C01F7/54C01P2006/80
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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