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Method for recovering metallic aluminium from aluminum ash

A technology for metal aluminum and aluminum ash, applied in the field of aluminum ash recycling, can solve the problems of a large amount of molten aluminum entrained in the slag, the high energy consumption of the extraction method, and the high aluminum loss rate, so as to improve the purity, improve the recovery rate, and solve the problem of over-grinding. effect of loss

Active Publication Date: 2018-11-27
郑州中科新兴产业技术研究院 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extraction method adopted by the invention consumes a lot of energy, and because the slag content is high during the heating process, the slag entrains more molten aluminum when the molten aluminum is separated, and the aluminum loss rate is high

Method used

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  • Method for recovering metallic aluminium from aluminum ash

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Effect test

Embodiment 1

[0032] The method for recovering metal aluminum from aluminum ash may further comprise the steps:

[0033] The aluminum ash waste from a certain place in Gongyi is fully crushed by a hammer crusher, and the crushed products are screened by a linear vibrating screen with a screen aperture of 10mm. The purity of the large aluminum particles on the screen can reach more than 95%. The product under the sieve is transported to the ball mill through the belt, and water is added according to the ratio of solid to liquid during the ball milling process. After solid-liquid separation and drying treatment, fine aluminum powder is obtained. The purity of fine aluminum powder reaches more than 70%. The slurry under wet sieve is subjected to pressure filtration treatment to obtain aluminum extraction tailings and filtrate. The filtrate is recycled and used as ball milling process and Addition of water during wet sieving. Compared with the traditional dry separation process, the "wet grind...

Embodiment 2

[0035] The method for recovering metal aluminum from aluminum ash may further comprise the steps:

[0036] The aluminum ash waste from a certain place in Luoyang is fully crushed by a roller crusher, and the crushed product is screened by a linear vibrating screen with a screen aperture of 5mm. The purity of the large aluminum particles on the screen can reach more than 90%. The under-screen product is transported to the ball mill through a belt. During the ball milling process, water is added according to the ratio of solid to liquid ratio of 1:0.8. After the ball milling, the slurry is separated by wet sieving through a linear vibrating screen with a screen aperture of 150 mesh. The solids on the wet sieve are passed through After solid-liquid separation and drying treatment, fine aluminum powder is obtained. The purity of fine aluminum powder reaches more than 60%. The slurry under the wet sieve is subjected to pressure filtration treatment to obtain aluminum extraction tail...

Embodiment 3

[0038] The method for recovering metal aluminum from aluminum ash may further comprise the steps:

[0039] The aluminum ash waste from a certain place in Dengfeng is fully crushed by an impact crusher, and the crushed product is screened by a linear vibrating screen with a screen aperture of 10mm. The purity of the large aluminum particles on the screen can reach more than 95%. The under-screen product is transported to the ball mill through a belt. During the ball milling process, water is added according to the ratio of solid-liquid ratio of 1:1. After the ball milling, the slurry is separated by wet sieving through a linear vibrating screen with a screen aperture of 100 mesh. The solids on the wet sieve are passed through After solid-liquid separation and drying treatment, fine aluminum powder is obtained. The purity of fine aluminum powder reaches more than 65%. The slurry under the wet sieve is subjected to pressure filtration treatment to obtain aluminum extraction tailin...

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Abstract

The invention provides a method for recovering metallic aluminium from aluminum ash. The method comprises the following steps: (1) carrying out selective crushing treatment on aluminium-ash waste slag; (2) carrying out sieving and grading on crushed products, sorting out substances on sieve and residues on sieve, wherein the substances on sieve are coarse aluminium particles; (3) adding the residues on sieve into a ball milling machine to carry out wet milling, and adding a proper amount of water in the ball-milling process; (4) carrying out wet-sieving sorting on ball-milling products to obtain wet-sieved substances on sieve and wet-sieved residual slurry; (5) carrying out drying treatment on the wet-sieved substances on sieve to obtain fine aluminium powder; and (6) carrying out pressing-filtering treatment on the wet-sieved residual slurry to obtain aluminium-extracted tail mud and electrolyte-containing circulating water. The method provided by the invention has the beneficial effects that by the means of selective crushing, wet grinding, wet sieving and the like, high-efficiency separation of the metallic aluminium from the components such as nonmetallic phases, soluble electrolyte salts and the like is realized and a new path is opened up for recycling solid wastes (aluminium ash) produced in the industries of aluminium electrolysis and aluminium processing and the like.

Description

technical field [0001] The invention relates to the technical field of recycling aluminum ash, in particular to a method for recycling metal aluminum from aluminum ash. Background technique [0002] Aluminum ash is a solid waste produced in the electrolytic aluminum production process and the smelting process of primary aluminum or recycled aluminum. It is mainly composed of cooled metal aluminum, oxides produced in high temperature processes, fluxes, and electrolyte salts. According to literature reports, the content of metal aluminum in aluminum ash is 10%-30%, the content of aluminum oxide is 20%-40%, the content of silicon, magnesium, and iron oxides is 7%-15%, and the content of potassium, sodium, calcium, magnesium, etc. Chloride and fluoride content is 15%-30%. It can be seen that the valuable elements in aluminum ash are rich in content and have high recycling value. Therefore, the use of aluminum ash to extract metal aluminum can not only improve the negative impa...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B21/00
CPCC22B7/005C22B7/04C22B21/0069Y02P10/20
Inventor 田登超李永利郭强付明波刘宇锋
Owner 郑州中科新兴产业技术研究院
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