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Method for harmlessly treating aluminum ash and preparing sandy alumina

A harmless treatment, aluminum oxide technology, applied in chemical instruments and methods, alkali metal aluminate/alumina/aluminum hydroxide preparation, alumina/hydroxide preparation, etc., can solve environmental pollution and waste of resources and other issues, to achieve the effect of less investment in equipment, high production efficiency, and high environmental protection benefits

Active Publication Date: 2015-01-07
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2008, the Ministry of Environmental Protection and the Development and Reform Commission classified primary smelting slag, salt slag, scum and flammable slag produced in the process of aluminum pyro-smelting produced in the process of aluminum pyro-smelting The slag is included in the "National Hazardous Waste List", and with the increase in the output of electrolytic aluminum, aluminum processing, and waste aluminum recycling in my country, a large amount of aluminum ash is produced. If it is not handled properly, it will not only waste resources, but also pollute the environment.

Method used

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  • Method for harmlessly treating aluminum ash and preparing sandy alumina

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Effect test

Embodiment 1

[0029] Put the aluminum ash into the aluminum ash high-speed processing system, and control the reaction temperature of the system to 900 o C. At the same time, the aluminum ash is continuously stirred, and the metal aluminum gathers in the collection device. After the aluminum ash is discharged from the high-speed processing system, it is directly introduced into a 5g / L sodium hydroxide solution, and the alkali washing temperature is controlled by adjusting the power of the microwave to 50 o c. After 2.5 hours, pour the aluminum ash after alkali washing into the filter equipment for filtration, and then pour the solid phase into the drying oven for drying until the water content is ≤14%. The dried aluminum ash and sodium carbonate are mixed in a ratio of 1:1, and then sodium hydroxide is added according to 20% of the mass of the aluminum ash, and placed in a rotary kiln. Keep the temperature of the kiln head of the rotary kiln at 1200 o C, the rotational speed of the rot...

Embodiment 2

[0032] Put the aluminum ash into the aluminum ash high-speed processing system, and control the reaction temperature of the system to 650 o C. At the same time, the aluminum ash is continuously stirred, and the metal aluminum gathers in the collection device. After the aluminum ash is discharged from the high-speed processing system, it is directly introduced into a 10 g / L sodium hydroxide solution, and the alkali cleaning temperature is controlled by adjusting the power of the microwave to 120 o c. After 1.5 hours, pour the aluminum ash after alkali washing into the filter equipment for filtration, and then pour the solid phase into the drying oven for drying. The dried aluminum ash and sodium carbonate are mixed in a ratio of 1:1, and then sodium hydroxide is added according to 10% of the mass of the aluminum ash, and placed in a rotary kiln. Keep the temperature of the rotary kiln at 750 o C, the rotational speed of the rotary kiln is 20 m / h. Finally, sintered clinker...

Embodiment 3

[0035] Put the aluminum ash into the aluminum ash high-speed processing system, and control the reaction temperature of the system to 800 o C. At the same time, the aluminum ash is continuously stirred, and the metal aluminum gathers in the collection device. After the aluminum ash is discharged from the high-speed processing system, it is directly introduced into the 8g / L sodium hydroxide solution, and the alkali washing temperature is controlled by adjusting the power of the microwave to 100 oc. After 2 hours, pour the aluminum ash after alkali washing into the filter equipment for filtration, and then pour the solid phase into the drying oven for drying. The dried aluminum ash and sodium carbonate are mixed according to the ratio of 1:1.8, and then sodium hydroxide is added according to 50% of the mass of the aluminum ash, and placed in a rotary kiln. Keep the temperature of the rotary kiln at 1100 o C, the rotational speed of the rotary kiln is 13m / h. Finally, sintere...

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Abstract

The invention discloses a method for harmlessly treating aluminum ash and preparing sandy alumina. The method disclosed by the invention mainly comprises the following main steps of remelting, alkaline washing, drying and sintering, dissolving out, filtrating and purifying, carbon component decomposition, and roasting, and is specifically implemented by taking aluminum ash produced in the processes of aluminum electrolytic smelting and coarse aluminum refining as a raw material through the process post-treatment steps of recovering metallic aluminium, carrying out alkaline wash for removing impurities, sintering sodium carbonate, dissolving out sintered clinker, carrying out deep impurities removal on a sodium aluminate solution, separating and washing carbon components and aluminum hydroxide, roasting aluminum hydroxide, evaporating carbon component mother liquor, and the like, so that a sandy alumina product is obtained. Fluorine in aluminum ash, after being discharged in silicon fluoride form, is absorbed by using an aqueous solution. The method disclosed by the invention realizes the harmless treatment of aluminum ash, the method is simple in process and low in production cost, and the environmental pollution and the resource wastes caused by the aluminum ash are avoided.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recovery and utilization of metallurgical technology waste, and in particular relates to a method for harmlessly treating aluminum ash and preparing 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 in aluminum ash accounts for about 1% to 12% of the total aluminum loss in the process of aluminum production and use. The aluminum content in aluminum ash ranges from 10% to 80%, mainly containing a mixture of aluminum scum, nitride, NaCl, KCl, fluoride, alumina and aluminum. In 2008, the Ministry of Environmental Protection and the Development and Reform Commission classified primary smelting slag, salt slag, scum and flammable slag produced in the process of aluminum pyro-smelting produced in the process of aluminum pyr...

Claims

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Application Information

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IPC IPC(8): C01F7/14C01F7/30
CPCC01F7/142C01F7/30C01P2004/90C01P2006/80
Inventor 谢刚于站良郝红杰和晓才谢天鉴田林姚云施辉献柯浪许娜
Owner KUNMING METALLURGY INST
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