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Method for producing cryolite by using fluorine-containing waste residues of electrolytic aluminium

A technology for electrolysis of aluminum and cryolite, applied in the field of aluminum metal smelting, can solve the problems of waste of fluorine resources, environmental pollution, failure to return to electrolytic aluminum, etc., and achieves the effect of low production cost, significant economic benefits, and solving the bottleneck of development.

Active Publication Date: 2011-06-01
BAIYIN ZHONGTIAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For these fluorine-containing waste residues, through simple purification treatment at present, they cannot meet the standard for returning to electrolytic aluminum, so they can only be disposed of by stacking, which not only causes environmental pollution, but also wastes fluorine resources.

Method used

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  • Method for producing cryolite by using fluorine-containing waste residues of electrolytic aluminium
  • Method for producing cryolite by using fluorine-containing waste residues of electrolytic aluminium
  • Method for producing cryolite by using fluorine-containing waste residues of electrolytic aluminium

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The method that present embodiment utilizes the fluorine-containing waste residue of concentrated sulfuric acid and electrolytic aluminum to produce cryolite comprises the following steps:

[0025] (1) React fluorine-containing waste residue with 98% concentrated sulfuric acid four times its mass at a temperature of 450°C for 5 hours;

[0026] (2) The sulfur dioxide, carbon dioxide, and hydrogen fluoride gases generated during the reaction are condensed by the condenser (the boiling point of HF is 19.54°C);

[0027] (3) After the condensation is completed, the hydrogen fluoride liquid in the lower part of the condenser is absorbed by adding water to a concentration of 40% for subsequent reactions;

[0028] (4) Sulfur dioxide and carbon dioxide gas from the upper part of the condenser are separated from 90% of carbon dioxide by the dry purification equipment cyclone dust collector;

[0029] (5) Purify the sulfur dioxide gas from which carbon dioxide has been separated t...

Embodiment 2

[0034] The method that present embodiment utilizes the fluorine-containing waste residue of concentrated sulfuric acid and electrolytic aluminum to produce cryolite comprises the following steps:

[0035] (1) React fluorine-containing waste residue with 98% concentrated sulfuric acid at 250°C for 8 hours at 250°C;

[0036] (2) The sulfur dioxide, carbon dioxide, and hydrogen fluoride gases generated during the reaction are condensed by the condenser (the boiling point of HF is 19.54°C);

[0037] (3) After the condensation is completed, the hydrogen fluoride liquid in the lower part of the condenser is absorbed with washing water to a concentration of 30% for subsequent reactions;

[0038] (4) Sulfur dioxide and carbon dioxide gas from the upper part of the condenser are separated from 90% of carbon dioxide by the electrostatic precipitator of the dry purification equipment;

[0039] (5) Purify the sulfur dioxide gas from which carbon dioxide has been separated through a wet p...

Embodiment 3

[0044] The method that present embodiment utilizes the fluorine-containing waste residue of concentrated sulfuric acid and electrolytic aluminum to produce cryolite comprises the following steps:

[0045] (1) React fluorine-containing waste residue with concentrated sulfuric acid with a concentration twice the mass of 98% at a temperature of 150°C for 12 hours;

[0046] (2) The sulfur dioxide, carbon dioxide, and hydrogen fluoride gases generated during the reaction are condensed by the condenser (the boiling point of HF is 19.54°C);

[0047] (3) After the condensation is completed, the hydrogen fluoride liquid in the lower part of the condenser is absorbed with washing water to a concentration of 25% for subsequent reactions;

[0048] (4) Sulfur dioxide and carbon dioxide gas from the upper part of the condenser are separated from 90% of carbon dioxide by the dry purification equipment cyclone dust collector;

[0049] (5) Purify the sulfur dioxide gas from which carbon dioxi...

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Abstract

The invention belongs to the technical field of aluminum industry smelting, and relates to a method for producing cryolite by using fluorine-containing waste residues of electrolytic aluminium. The technical scheme adopted by the invention is as follows: the fluorine-containing waste residues of the electrolytic aluminium and concentrated sulfuric acid are taken as raw materials to produce the cryolite. The method provided by the invention is used to improve the use ratio of the cryolite, prevent the waste of fluorine resources, and reduce the environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of aluminum metal smelting, and relates to a method for producing cryolite from electrolytic aluminum fluorine-containing waste residue. Background technique [0002] At present, the vast majority of fluoride salt products are based on fluorite (main component CaF 2 ) as raw material, the reserves of fluorspar are very limited, as an important strategic resource for the development of the atomic energy industry, all countries attach great importance to the protection of fluorspar resources, with the increasing scarcity of fluorspar resources worldwide and the rising price , leading to an inevitable trend for the inorganic fluorine chemical industry to seek other fluorine resources. [0003] Cryolite is a fluoroaluminate, also known as sodium fluoroaluminate, its molecular formula is Na 3 AIF 6 , Natural cryolite is a monoclinic prismatic crystal, colorless, due to the influence of impurities, it is oft...

Claims

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Application Information

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IPC IPC(8): C01F7/54B09B3/00
CPCY02W30/20
Inventor 侯红军刘海霞杨华春于贺华罗成果师玉萍马晓芬
Owner BAIYIN ZHONGTIAN CHEM
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