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Method for recycling cryolite through combined treatment of aluminum electrolysis overhaul slag and aluminum ash

A combined treatment and overhaul slag technology, applied in chemical instruments and methods, aluminum fluoride, aluminum halide, etc., can solve problems such as difficult product outlets, environmental pollution, and inability to obtain economic benefits

Active Publication Date: 2021-07-06
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum ash is a good resource, but it has not been paid enough attention. It pollutes the environment and becomes hazardous waste. Secondary aluminum ash contains a large amount of aluminum oxide, aluminum nitride and salt, and has high utilization value. Therefore, it is necessary to look for a A good method for comprehensive utilization of secondary aluminum ash resources is of great significance
[0005] At present, the overhaul slag and aluminum ash are processed separately, and the corresponding final products are obtained respectively. The product outlet is relatively difficult, so that economic benefits cannot be obtained

Method used

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  • Method for recycling cryolite through combined treatment of aluminum electrolysis overhaul slag and aluminum ash
  • Method for recycling cryolite through combined treatment of aluminum electrolysis overhaul slag and aluminum ash
  • Method for recycling cryolite through combined treatment of aluminum electrolysis overhaul slag and aluminum ash

Examples

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Effect test

Embodiment 1

[0032] A method for joint processing of aluminum electrolysis overhaul slag and aluminum ash to reclaim cryolite, comprising the following processing steps:

[0033] (1) Harmless treatment of overhaul slag

[0034] a) crushing and grinding: the overhaul slag is crushed and powdered, and the particle size of the ground powder obtained is 18 mesh;

[0035] b) Water immersion: Throw the ground powder into the water immersion reaction tank, add water in the water immersion reaction tank for stirring reaction, wherein the mass ratio of water to the ground powder is 6:1, and the water immersion reaction The time is 3h. After the reaction is completed, solid-liquid separation is carried out to obtain water leaching residue and water immersion liquid;

[0036] c) Cyanide breaking and fluorine sinking in the water immersion solution: add a cyanide breaking agent to the water immersion solution to carry out the cyanide breaking reaction, and then add calcium chloride twice the fluorid...

Embodiment 2

[0044] A method for joint processing of aluminum electrolysis overhaul slag and aluminum ash to reclaim cryolite, comprising the following processing steps:

[0045] (1) Harmless treatment of overhaul slag

[0046] a) crushing and pulverizing the overhaul slag, so that the particle size of the ground powder is 120 mesh;

[0047] b) Water immersion: Throw the ground powder into the reaction tank, add water for stirring reaction, wherein the mass ratio of water to the ground powder is 10:1, and the water immersion reaction time is 0.5h. After the reaction is completed, solid-liquid separation is carried out to obtain water leaching residue and water immersion liquid;

[0048] c) Cyanide breaking and fluorine sinking in water immersion solution: oxidant is added to water immersion solution 1 to carry out cyanide breaking reaction, after cyanide breaking, calcium chloride with 3 times the fluoride content in water immersion solution 1 is added to carry out fluoride sinking, and t...

Embodiment 3

[0056] A method for joint processing of aluminum electrolysis overhaul slag and aluminum ash to reclaim cryolite, comprising the following processing steps:

[0057] (1) Harmless treatment of overhaul slag

[0058] a) crushing and grinding the overhaul slag to obtain a particle size of the ground powder is 200 mesh;

[0059] b) Water immersion: put the ground powder into the reaction tank, add water for stirring reaction, wherein the mass ratio of water to the ground powder is 3:1, and the water immersion reaction time is 6h. After the reaction is completed, solid-liquid separation is carried out to obtain water immersion residue 1 and water immersion liquid 1;

[0060] c) Water immersion solution 1 for cyanide breaking and fluorine sinking: add oxidant to water immersion solution 1 for cyanide breaking reaction, after cyanide breaking, add water immersion solution 1 with 5 times the fluoride content of aluminum chloride for fluorine sinking and defluorination reaction The t...

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Abstract

The invention discloses a method for recycling cryolite through combined treatment of aluminum electrolysis overhaul slag and aluminum ash, and relates to an aluminum electrolysis solid waste treatment technology. The method comprises the following steps: (1) carrying out water leaching and acid leaching on the overhaul slag; (2) soaking aluminum ash in water; (3) carrying out alkaline leaching on the aluminum ash water leaching residues: reacting the salt-alkali mixed solution obtained in the step (1) with the water leaching residues to obtain a mixed solution of sodium aluminate and salt; (4) detecting the aluminum content and the salt content of the mixed solution in the step (3), and compounding the mixed solution of sodium aluminate and salt to obtain a mixed compound solution for later use; and (5) mixing the mixed compound liquid obtained in the step (4) and the hydrofluoric acid obtained in the step (1) to carry out cryolite synthesis reaction. The overhaul slag and the aluminum ash are subjected to innocent treatment, fluorine in the overhaul slag and aluminum in the aluminum ash are recycled, cryolite is synthesized and returned to the aluminum electrolysis cell, resource recycling of harmful waste slag is achieved, the production cost of electrolytic aluminum is reduced, and the method is suitable for application and popularization.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis solid waste treatment, in particular to a method for recovering cryolite through combined treatment of aluminum electrolysis overhaul slag and aluminum ash. Background technique [0002] With the increase of my country's aluminum production, the discharge of overhaul slag is also increasing year by year, and about 15-25kg of overhaul slag is discharged for every 1 ton of aluminum produced. Overhaul slag is an inevitable solid hazardous waste in the production of aluminum electrolysis. The main toxic substances are soluble fluoride and cyanide, which are extremely harmful to the environment, including soil, water and the atmosphere. [0003] The treatment of overhaul slag mainly includes fire method and wet method. The fire method can achieve the removal and recovery of fluoride to a certain extent, but its further industrial application and development are limited due to its large i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54C01F11/22C01C1/02
CPCC01F7/54C01F11/22C01C1/026C01C1/022
Inventor 林宏飞陆立海周郁文丘能杜建嘉慕俊豪黄海师
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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