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Step recycling method for metallic aluminum in aluminum ash

A cascade recycling and metal aluminum technology, applied in the direction of process efficiency improvement, solid separation, etc., can solve the problems of difficult smelting and low purity of aluminum powder, and achieve the effect of improving metal recovery rate and high metal recovery rate

Active Publication Date: 2018-07-27
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the main purpose of the present invention is to overcome the problems of low purity of aluminum powder and high difficulty in smelting of aluminum ash dry grinding-winding technology, and provide a stepwise recovery method for metal aluminum in aluminum ash, which is Efficient extraction of metallic aluminum from aluminum ash provides an effective route

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Pre-screen 1kg of aluminum ash with a 10mm sieve to obtain aluminum ash on the sieve and aluminum ash under the sieve, crush the aluminum ash on the sieve with an impact crusher, and then check and sieve it with a 10mm sieve to obtain metallic aluminum Granules and aluminum ash under the sieve, the metal aluminum content of the metal aluminum granules is 96.01%; check the sieved aluminum ash and the pre-screened aluminum ash for wet ball milling, the ball mill slurry is classified through a 0.5mm fine sieve, The grading particle size is 43 μm, and large-grain metal aluminum flakes and fine-grain slurry are obtained. The metal aluminum content of large-grain metal aluminum flakes is 93.24%; the fine-grain slurry is re-selected to obtain fine-grain metal aluminum powder and tailings. The metal aluminum content of the metal aluminum powder is 64.21%; the tailings are dehydrated to obtain filtrate and filter residue; the filtrate is recycled and enriched and evaporated to re...

Embodiment 2

[0032] Pre-screen 1kg of aluminum ash with a 2mm sieve to obtain aluminum ash on the sieve and aluminum ash under the sieve, crush the aluminum ash on the sieve with an impact crusher, and then check and sieve it with a 2mm sieve to obtain metallic aluminum Granules and aluminum ash under the sieve, the metal aluminum content of the metal aluminum granules is 95.11%; check the sieved aluminum ash and the pre-screened aluminum ash for wet ball milling, and the ball mill slurry is classified through a 0.075mm fine sieve, The grading particle size is 500 μm, and large-grain metal aluminum flakes and fine-grain slurry are obtained. The metal aluminum content of large-grain metal aluminum flakes is 94.24%; the fine-grain slurry is re-selected to obtain fine-grain metal aluminum powder and tailings, and The metal aluminum content of the metal aluminum powder is 54.31%; the tailings are dehydrated to obtain filtrate and filter residue; the filtrate is recycled and enriched and evapora...

Embodiment 3

[0034] Pre-screen 1kg of aluminum ash with a 100mm sieve to obtain aluminum ash on the sieve and aluminum ash under the sieve, crush the aluminum ash on the sieve with an impact crusher, and then check and sieve it with a 100mm sieve to obtain metallic aluminum Granules and aluminum ash under the sieve, the metal aluminum content of the metal aluminum granules is 96.12%; check the screened aluminum ash and the pre-screened aluminum ash for wet ball milling, the ball mill slurry is classified by a spiral classifier, and the graded The particle size is 200 μm, to obtain large-grain metal aluminum flakes and fine-grain slurry, the metal aluminum content of the large-grain metal aluminum flakes is 93.33%; the fine-grain slurry is re-selected to obtain fine-grain metal aluminum powder and tailings, fine-grain metal The metal aluminum content of the aluminum powder is 74.31%; the tailings are dehydrated to obtain filtrate and filter residue; the filtrate is recycled and enriched and ...

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Abstract

The invention discloses a step recycling method for metallic aluminum in aluminum ash. The step recycling method includes steps of 1), sieving the aluminum ash to obtain oversize aluminum ash and undersize aluminum ash; 2), smashing the oversize aluminum ash obtained at the step 1), and then sieving the oversize aluminum ash to obtain metallic aluminum particles and undersize aluminum ash; 3), carrying out wet ball-milling on the undersize aluminum ash obtained at the steps 1) and 2) to obtain ball-milled slurry; 4), carrying out wet classification on the ball-milled slurry to obtain large-particle metallic aluminum sheets and fine-particle slurry; 5), sorting the fine-particle slurry to obtain fine-particle metallic aluminum powder and tailings; 6), dehydrating the tailings to obtain filter liquor and filter residues; 7), carrying out circulation enrichment the filter liquor and then evaporating the filter liquor to recycle industrial salt; 8), mounting ammonia gas collecting and absorbing devices above all materials exposed in the air in aluminum ash treatment procedures. The step recycling method has the advantages that step recycling is carried out on the metallic aluminum, accordingly, the metal recycling rate can be greatly increased, the purity of products can be greatly improved, and a novel way can be developed for harmlessly utilizing the aluminum ash as a resource.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment of electrolytic aluminum, in particular, the invention relates to a method for cascade recovery of metal aluminum in aluminum ash. Background technique [0002] Aluminum ash is the scum floating on the surface of aluminum melt during the process of electrolytic aluminum and aluminum smelting. It is in the form of loose ash and is listed as hazardous waste by the state. my country is a big producer of electrolytic aluminum, accounting for more than half of the world's electrolytic aluminum output, and produces more than 1.5 million tons of waste aluminum ash every year. Because it contains a large amount of fluoride, waste salt, and a small amount of heavy metals, it poses a great threat to the surrounding environment, but waste Aluminum ash contains a large amount of metallic aluminum and alumina, which is a very valuable resource. Therefore, the harmless disposal method of waste alu...

Claims

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Application Information

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IPC IPC(8): B03B9/04C22B7/02C22B21/00
CPCB03B9/04C22B7/00C22B7/02C22B21/0069Y02P10/20
Inventor 李永利郭强刘宇峰齐涛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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