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Resource utilization method of aluminum ash

A technology of resource utilization and aluminum ash, applied in the direction of improving process efficiency, can solve the problems of large waste, low recovery rate, large energy consumption, etc., and achieve the effects of low energy consumption, high production efficiency, and low equipment investment.

Active Publication Date: 2014-02-05
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the recovery rate of aluminum slag treatment in my country is low, and the energy consumption and waste are large, such as a method for extracting aluminum and chloride in aluminum ash (200810115443.X), a method for recovering alumina, chloride salts, and fluorine salts from aluminum ash (201110324018.3), a method of aluminum ash treatment and recycling (201310078058.3), a method of using waste aluminum ash to produce fluorine-containing β-alumina for aluminum electrolytic cells (200710179676.1), aluminum ash recovery device (201110394868.0) and other related patents Therefore, we should vigorously develop new technologies and adopt foreign advanced technologies and equipment to change this backward state. Research and development of comprehensive and effective processing of industrial aluminum slag and aluminum ash technology is very important for improving the economic benefits of enterprises and protecting the ecological environment. practical significance and practical value

Method used

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  • Resource utilization method of aluminum ash

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] After the aluminum ash is crushed by the jaw crusher, it is ball milled. The ball milling time is 15 minutes. After the ball milling, the 200-mesh sieve accounts for about 50%. After the ball milling, the aluminum ash is vibrated and screened. Metal aluminum in aluminum ash can be recovered, and its recovery rate is 95%. The aluminum ash under the sieve after ball milling is used as raw material, and the mass ratio of distilled water to aluminum ash is 3:1 for mixing. The mixing temperature is 65°C and the stirring time is 4h, filter the washed aluminum ash; put the sodium hydroxide solution and the washed aluminum ash in an autoclave to mix and stir at a liquid-solid ratio of 7:1, wherein the concentration of the sodium hydroxide solution is 130g / L, and the temperature is 140°C , the reaction pressure is 1.5MPa. After mixing and stirring for 6 hours, filter; mix and stir the mixed solution of sulfuric acid and hydrochloric acid with the aluminum ash after alkali leachi...

Embodiment 2

[0034] After the aluminum ash is crushed by the jaw crusher, it is ball milled. The ball milling time is 30 minutes. After the ball milling, the 200-mesh sieve accounts for about 55%. After the ball milling, the aluminum ash is vibrated and screened. Metal aluminum in aluminum ash can be recovered, and its recovery rate is 96%. The aluminum ash under the sieve after ball milling is used as raw material, and the mass ratio of distilled water to aluminum ash is 5:1 for mixing. The mixing temperature is 70°C, and the stirring time is 3h, filter to get washed aluminum ash; put sodium hydroxide, potassium hydroxide mixed solution and washed aluminum ash in an autoclave for mixing and stirring at a liquid-solid ratio of 6:1, wherein the concentration of the alkali solution is 120g / L , the temperature is 165°C, and the reaction pressure is 2.5MPa. After mixing and stirring for 5 hours, filter; mix and stir the sulfuric acid solution and the aluminum ash after alkali leaching at a liq...

Embodiment 3

[0036] After the aluminum ash is crushed by the jaw crusher, it is ball milled. The ball milling time is 45 minutes. After the ball milling, the 200 mesh sieve accounts for about 60%. After the ball milling, the aluminum ash is vibrated and screened. The ductility of metal aluminum is good. Metal aluminum in aluminum ash can be recovered, and its recovery rate is 98%. The aluminum ash under the sieve after ball milling is used as raw material, and the mass ratio of distilled water to aluminum ash is 7:1 for mixing. The mixing temperature is 85°C and the stirring time is After 2 hours, filter to obtain washed aluminum ash; put ammonia water and washed aluminum ash in an autoclave for mixing and stirring at a liquid-solid ratio of 8:1, the temperature is 195°C, and the reaction pressure is 0.8MPa. After mixing and stirring for 6 hours, filter; mix and stir sulfuric acid, nitric acid solution and aluminum ash after alkali leaching at a liquid-solid ratio of 4:1, in which the acid ...

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Abstract

The invention discloses a resource utilization method of aluminum ash. The method comprises the following steps: by taking primary slag and flammable dross generated in a smelting process of electrolytic aluminum, and aluminum ash such as salt slag and scum generated in a coarse aluminum refining and processing process as raw materials, recovering aluminum through process steps of crushing, grinding and vibrating screening; and then, respectively carrying out technologies such as washing, pressurized alkaline leaching and normal pressure acid leaching to obtain aluminum oxide-rich aluminum ash. The aluminum ash dried and activated by microwaves returns to an aluminum cell. After the acid-washing liquid waste and alkali-washing waste are effectively neutralized, the acid-washing liquid waste and alkali-washing waste are concentrated and evaporated to recover effective salt. The process provided by the invention can realize resource utilization of aluminum ash on the spot, and is simple and easy to operate and low in production cost, so that the environmental pollution and resource waste caused by aluminum ash are avoided.

Description

technical field [0001] The invention belongs to the technical fields of aluminum electrolysis, aluminum processing, and waste aluminum recycling, and in particular relates to a resource utilization method of aluminum ash. Background technique [0002] Aluminum ash is produced in all production processes where aluminum is melted, and the aluminum content ranges from 10% to 80%. The aluminum in it accounts for about 1% to 12% of the total loss in the process of aluminum production and use. It is mainly divided into two types: one One is primary aluminum ash, which produces dross in the process of electrolysis of primary aluminum and casting without adding salt flux. It is a mixture of metallic aluminum and aluminum oxide, and the aluminum content can reach 15% to 70%; the other is The second type is secondary aluminum ash, which is a mixture of NaCl, KCl, fluoride, alumina and aluminum produced by the recovery of primary aluminum ash after salt bath treatment or aluminum alloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C25C3/06
CPCY02P10/20
Inventor 谢刚于站良田林谢天鉴陈家辉施辉献许娜
Owner KUNMING METALLURGY INST
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