Method for harmless disposal and recycling of aluminum ash

A technology of harmless treatment and aluminum ash, which is applied in the field of metallurgy and environmental protection, can solve the problems of unrealized industrial production scale, high production cost, and restricted development, and achieve great social value and economic and environmental benefits, high environmental benefits, and equipment The effect of less investment

Active Publication Date: 2016-01-27
YUNNAN WENSHAN ALUMINUM
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

One is that the aluminum ash is returned to the aluminum electrolysis process after simple treatment to produce metal aluminum again. This method seems feasible, but most of the aluminum in the aluminum ash is α-Al with a good crystal lattice. 2 o 3 , its activity is very poor. Although it can be dissolved by the electrolyte during the electrolysis process, its ionization requires more energy than directly adding aluminum electrolysis raw materials, which will inevitably cause problems such as increased energy consumption in the aluminum electrolysis process and increased cell voltage.
Another route is to remove impurities after the aluminum ash is treated by the acid method or alkali method, and then produce chemical products such as aluminum trichloride and aluminum sulfate. This type of method has great development prospects, but the use of aluminum ash to produce such chemical products The product is still in the research stage, has not yet achieved industrial scale production, and the production cost is higher than the cost of existing production methods
The third route is to u

Method used

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  • Method for harmless disposal and recycling of aluminum ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Take 100g of aluminum ash, add the liquid-solid ratio of 4:1, soak in water at 50°C for 3 hours, use a gas collection device to recover the ammonia gas generated during the water immersion at the same time, then separate the liquid from the solid and wash with water until neutral. Dry at 80°C for 24 hours, and recover the liquid generated during water immersion for evaporation and crystallization to recover chloride salts. Heat the dried aluminum ash to 800°C in a closed furnace with a gas collection device, keep it warm for 2 hours, stop the heat preservation, and after cooling to normal temperature, remove the collection device, take out the material and grind it. The fluoride produced during the roasting process is collected into the recovery unit as raw material for the production of fluoride.

[0036] Take 50g of aluminum ash after harmless treatment, add sodium hydroxide and aluminum ash with a mass ratio of 1:0.9 and mix well, then sinter in a conventional furnace...

Embodiment ２

[0038] Take 100g aluminum ash, add liquid-solid ratio to be 6:1, at 80 o C under water immersion for 4 hours, while water immersion, use a gas collection device to recover the ammonia gas produced in the water immersion process, and then separate the liquid from the solid and wash it to neutrality at 80 o Dry at C for 24 hours, and the liquid recovered during the water immersion process is used for evaporative crystallization to recover chloride salts. Heat the dried aluminum ash to 1000°C in a closed furnace with a gas collection device, keep it warm for 1.5 hours, then stop the heat preservation, and after cooling to normal temperature, remove the collection device, take out the material and grind it. The fluoride produced during the roasting process is collected into the recovery unit as raw material for the production of fluoride.

[0039] Take 50g of harmless-treated aluminum ash, add sodium hydroxide and aluminum ash with a mass ratio of 1:1.2, mix them well, sinter in ...

Embodiment 3

[0041] Get 100g aluminum ash, add liquid-solid ratio to be 8:1, at 80 o C under water immersion for 4 hours, while water immersion, use a gas collection device to recover the ammonia gas produced in the water immersion process, and then separate the liquid from the solid and wash it to neutrality at 80 o Dry at C for 24 hours, and the liquid recovered during the water immersion process is used for evaporative crystallization to recover chloride salts. Heat the dried aluminum ash to 850°C in a closed furnace with a gas collection device, keep it warm for 1.5 hours, then stop the heat preservation, and after cooling to normal temperature, remove the collection device, take out the material and grind it. The fluoride produced during the roasting process is collected into the recovery unit as raw material for the production of fluoride.

[0042] Get 50g of the aluminum ash after harmless treatment, after adding sodium carbonate and aluminum ash that are 1:1 by mass ratio and mix,...

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Abstract

The invention discloses a method for harmless disposal and recycling of aluminum ash. The method comprises steps of raw material water immersion nitrogen and chlorine removal, calcination fluorine removal, alkali fusion sintering, sintering material dissolving-out and purifying impurity removal. Aluminum ash generated in metal aluminum smelting process is employed as a raw material, after metal aluminum is recycled through secondary processing, nitrides are removed through water immersion, fluorides are removed through calcinations, alkali fusion sintering is carried out, the sintering materials are dissolved out, impurities are removed through a sodium aluminate solution, the processed aluminum ash is employed as a raw material for producing sand-shaped aluminum oxide. Ammonia gas generated in the aluminum ash harmless disposal process can be employed as an ammonium production raw material, a chlorination liquid generated can be employed as a chlorate production raw material, and silicon fluoride gas generated in the calcination process is absorbed by an aqueous solution. The method is simple and practical, environmental protection benefits are high, the production efficiency is high, the device investment is low, and energy consumption is low. Harmless and recycling disposal of hazardous wastes can be achieved. The obtained product can be applied in practical production.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and environmental protection, and specifically relates to a method for harmlessly treating hazardous waste aluminum ash and removing impurities through alkali sintering treatment as a raw material for producing sandy alumina. Background technique [0002] Aluminum ash is produced in the production process of aluminum melting such as electrolysis of primary aluminum, casting aluminum products, and aluminum alloy refining. The aluminum content in aluminum ash ranges from 10% to 80%, and the aluminum in it accounts for about 1% to 12% of the total loss in the process of aluminum production and use. It mainly contains aluminum dross, nitrides, NaCl, KCl, and fluorides. , a mixture of alumina and aluminum, etc. According to the forecast of authoritative research institutes, China will produce 6-8.5 million tons of aluminum ash every year, and the trend is increasing year by year. It can be seen th...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01C1/02
Inventor 谢刚姚云田林谢天鉴于站良和晓才周扬民施辉献许娜
Owner YUNNAN WENSHAN ALUMINUM
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