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Harmless treatment and utilization method for aluminum ash

A technology for harmless treatment of aluminum ash, applied in chemical instruments and methods, inorganic chemistry, aluminum compounds, etc., can solve the problems of targeted treatment of environmental hazards, insufficient attention to environmental hazards and their treatment, etc. Slight effect of environmental impact

Inactive Publication Date: 2018-02-16
上海添瑞环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] From the research contents disclosed above, it can be seen that the research on aluminum ash so far is mainly focused on the utilization of resources, but insufficient attention has been paid to the environmental hazards in aluminum ash and their treatment. Most of the research has not involved environmental hazards targeted treatment

Method used

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  • Harmless treatment and utilization method for aluminum ash
  • Harmless treatment and utilization method for aluminum ash

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Experimental program
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Effect test

Embodiment 1

[0031]The secondary aluminum ash raw material is obtained from the primary aluminum ash produced in the primary aluminum production process through aluminum extraction, and no chloride additive is added during the aluminum extraction process. The main element content is: Al: 50% (including 15% of Al elemental substance); Si: 1%; Fe: 1%; K: 0.5%; Na: 5%; Ca: 1%; Mg: 0.5%; Cl : 0.5%; F: 8%; O: 30%; N: 2%; the rest are other elements. The above elements are mainly derived from the oxides and nitrides formed by the reaction of high-temperature liquid aluminum and air during the production of primary aluminum, as well as trace carbides and cyanides produced by the reaction of carbon anodes; cryolite (Na 3 AlF 6 ) mainly fluoride; a small amount of chloride introduced in the refining process before casting and other oxide impurities introduced in the production process and aluminum element entrained in the process of removing the above-mentioned slag phase.

[0032] Firstly, pre-t...

Embodiment 2

[0038] The secondary aluminum ash raw material is obtained from the primary aluminum ash produced in the primary aluminum production process through aluminum extraction, and the aluminum extraction process uses chloride additives. The content of the main elements is: Al: 40% (of which 5% of Al elemental substance); Si: 1%; Fe: 1%; K: 5%; Na: 7%; Ca: 1%; Mg: 2%; Cl: 8%; F: 4%; O: 28%; N: 2%; the rest are other elements. The above elements mainly come from the oxides and nitrides formed by the reaction between high-temperature liquid aluminum and air during the primary aluminum production process; trace carbides and cyanides produced by the reaction with carbon anodes; cryolite (Na 3 AlF 6 )-based fluoride; other oxide impurities introduced during the production process and the aluminum element entrained in the process of removing the above-mentioned slag phase; chlorides introduced during the primary aluminum ash extraction process.

[0039] Firstly, pre-treat the above-menti...

Embodiment 3

[0045] The secondary aluminum ash raw material is obtained from the primary aluminum ash produced in the production process of secondary aluminum through aluminum extraction, and no chloride additive is used in the aluminum extraction process. The content of the main elements is: Al: 43% (of which Al is 10%); Si: 8%; Fe: 1%; K: 1%; Na: 2%; Ca: 1.5%; Mg: 8%; Cl: 2%; F: 0.5%; O: 30%; N: 2%; the rest are other elements. The above elements mainly come from the oxides, nitrides and trace carbides and cyanides formed by the reaction between high-temperature liquid aluminum and air during the production of recycled aluminum; chlorides and fluorides introduced by covering agents and refining agents in the smelting process; Burning loss of alloying elements (mainly magnesium, silicon) and oxide impurities introduced in the production process; aluminum element entrained in the process of removing the above slag phase.

[0046] First, pre-treat the aluminum ash raw material: add water t...

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Abstract

The invention discloses a harmless treatment and utilization method for aluminum ash. On the basis of a conventional process, the method comprises the following steps: additionally pretreating an aluminum ash raw material, namely performing primary disliquid washing treatment on the aluminum ash with a diluted alkali liquid or water, performing gas-water separation on a gas with ammonia gases, hydrogen and acetylene in the disliquid washing process, collecting the gas, recycling the ammonia gases with a diluted acid liquid for preparing an ammonium salt, and utilizing a combustible gas after ammonia removal as fuel of later procedures; dissolving cyanide, dissoluble fluoride and chloride in the aluminum ash into a liquid phase in disliquid washing to form an alkali pretreatment liquid, thereby separating the dissoluble substances from insoluble solid phases in the aluminum ash. Due to addition of a specific procedure of harmless treatment on environment danger sources, main danger sources, namely cyanide and dissoluble fluoride in the aluminum ash are separated from the aluminum ash, convenience is brought to later harmless treatment, meanwhile the chloride in the aluminum ash is dissolved, and the situation that later disliquid process is affected by the chloride is avoided; and therefore, the purpose that potential danger is eliminated while the aluminum ash is recycled is achieved.

Description

technical field [0001] The invention relates to the treatment and utilization of aluminum ash, a waste slag in the aluminum production industry, in particular to a harmless treatment and utilization method of aluminum ash. Background technique [0002] my country is a big country in the production and consumption of aluminum industry. At present, my country's annual output of metal aluminum has reached more than 30 million tons, accounting for more than 50% of the world's total output, which is basically used for domestic consumption. In addition, more than 2 million tons of scrap aluminum are imported every year for the production of recycled aluminum, and the total amount of recycled aluminum is more than 7 million tons every year. The production of aluminum and recycled aluminum will produce a large amount of waste residue (aluminum ash). According to our current aluminum production, the annual production of aluminum ash is about 2.5 million tons or more. [0003] Alumi...

Claims

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Application Information

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IPC IPC(8): C01B3/02C01B3/08C01C1/16C01F7/06C01F7/42C04B7/24A62D3/02A62D3/38B09B3/00B09B5/00A62D101/45
CPCA62D3/02A62D3/38A62D2101/45B09B3/00B09B5/00C01B3/02C01B3/08C01C1/164C01F7/0693C01F7/42C04B7/24Y02E60/36Y02P40/10
Inventor 杨昇杨冠群吴竹成
Owner 上海添瑞环保科技有限公司
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