Production method of cryolite

A production method, cryolite technology, applied in the direction of aluminum fluoride, aluminum halide, etc., can solve problems such as environmental pollution, waste of resources, and restrictions on the development of the photovoltaic industry, and achieve the goals of reducing production costs, avoiding waste, and realizing waste liquid reuse Effect

Inactive Publication Date: 2011-10-19
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only causes environmental pollution, but also causes waste of resources, which is the bottleneck restricting the development of photovoltaic industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The production method of cryolite of the present embodiment is raw material with the fluorine-containing waste residue of electrolytic aluminum after flotation and the by-product of producing polysilicon material, comprising the following steps:

[0016] (1) Weigh 100g of electrolytic aluminum fluorine-containing waste slag after flotation and 60g of monocryolite by-product of polysilicon production;

[0017] (2) Mix the fluorine-containing waste residue of electrolytic aluminum after flotation in step (1), monocryolite by-product of polysilicon material production, and 1500g of fluorine-containing hydrochloric acid solution, and then stir and react at 90°C for 1 hour, then Filtrate, wash the filter cake with water, and dry the filter cake to obtain a cryolite product. The content of fluorine in the cryolite product is 52% by weight. The obtained filtrate and washing liquid are treated with lime and discharged.

[0018] Wherein the weight percentage content of Al in the...

Embodiment 2

[0020] The production method of cryolite of the present embodiment is raw material with the fluorine-containing waste residue of electrolytic aluminum after flotation and the by-product of producing polysilicon material, comprising the following steps:

[0021] (1) Weigh 100g of electrolytic aluminum fluorine-containing waste slag after flotation and 100g of monocryolite by-product of polysilicon production;

[0022] (2) Mix the fluorine-containing waste residue of electrolytic aluminum after flotation in step (1), the monocryolite by-product of polysilicon material production, and 200g of fluorine-containing hydrochloric acid solution, and then stir and react at 20°C for 6 hours, then Filtrate, wash the filter cake with water, and dry the filter cake to obtain a cryolite product. The content of fluorine in the cryolite product is 53.2% by weight. The obtained filtrate and washing liquid are treated with lime and used to produce calcium chloride.

[0023] Wherein the weight pe...

Embodiment 3

[0025] The production method of cryolite of the present embodiment is raw material with the fluorine-containing waste residue of electrolytic aluminum after flotation and the by-product of producing polysilicon material, comprising the following steps:

[0026] (1) Weigh 100g of electrolytic aluminum fluorine-containing waste slag after flotation and 50g of monocryolite by-product of polysilicon production;

[0027] (2) Mix the fluorine-containing waste residue of electrolytic aluminum after flotation in step (1), the monocryolite by-product of polysilicon material production, and 2250g of fluorine-containing hydrochloric acid solution, and then stir and react at 50°C for 2 hours, then Filtrate, wash the filter cake with water, and dry the filter cake to obtain a cryolite product. The content of fluorine in the cryolite product is 55% by weight. The obtained filtrate and washing liquid are treated with lime and used to produce calcium chloride.

[0028] Wherein the weight perc...

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PUM

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Abstract

The invention discloses a production method of cryolite. With electrolytic aluminium fluorine-containing waste residues from flotation and single cryolite which is the byproduct of polysilicon material production as the raw material, and the method comprises the steps of: weighing the electrolytic aluminium fluorine-containing waste residues from flotation and the single cryolite as the byproduct of polysilicon material production; mixing the weighed electrolytic aluminium fluorine-containing waste residues from flotation and the single cryolite as a byproduct of polysilicon material production with a fluorine containing hydrochloric acid solution, then leaving the mixture reacting for 1-6 hours under stirring DEG C, filtering the mixture, washing a filter cake with water and drying the filter cake, thus obtaining the cryolite product. And the generated filtrate and washing liquid can be treated with lime so as to be discharged or used in calcium chloride production. By combining the current development situation of fluorine chemical industry, the invention makes fully use of low grade fluorine resources and makes the recycling of fluorine resources come true. In addition, the invention also provides a solution to the waste treatment problem that restricts the development of the fluorine chemical industry.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for producing cryolite by using fluorine-containing waste generated in the application process of fluoride. Background technique [0002] Natural cryolite ore reserves are very small, and most of the cryolite currently in use is artificially synthesized. Cryolite production processes mainly include clay brine method, fluoroaluminate soda ash method, sodium fluorosilicate method, hydrofluoric acid, sodium aluminate method, etc. At present, the source of fluorine for the production of cryolite is mainly fluorite. As an important strategic resource for the development of the atomic energy industry, fluorite has limited reserves. All countries attach great importance to the protection of fluorite resources, and even adopt a policy of importing a large amount of fluorite. reserve. my country's fluorite resource reserves rank first in the world. As an important n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54
Inventor 侯红军杨华春李云峰李凌云于贺华刘海霞王建萍周小平
Owner DO FLUORIDE CHEM CO LTD
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