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A method for recycling aluminum in secondary aluminum ash

A secondary aluminum and bauxite technology, applied in the direction of alumina/aluminum hydroxide, process efficiency improvement, etc., can solve problems such as complex process, high cost of independent operation, poor product quality, etc.

Active Publication Date: 2020-11-06
中铝山东有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent CN101973565A discloses a method for recovering aluminum in aluminum ash by a low-temperature alkaline smelting method. This method uses a wet method to dispose of aluminum ash, which cannot avoid the generation of polluting gases, and at the same time the solution impurities cannot be purified; Chinese patent CN105347361A discloses a Aluminum ash comprehensive utilization treatment method, the method is complicated in process, high in independent operation cost, non-targeted disposal of impurities, and low added value of the product; Chinese patent CN1673084A discloses a method of producing alumina with waste aluminum ash, which is also unavoidable Generation of polluting gas, long process flow without impurity removal, and poor product quality

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  • A method for recycling aluminum in secondary aluminum ash

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Embodiment 1

[0042] A method for recycling aluminum in secondary aluminum ash, said method comprising the steps of:

[0043] Pass the secondary aluminum ash to be treated into the sintering equipment in a dry method; the particle size of the secondary aluminum ash is <1mm;

[0044] Mix bauxite, limestone, curing agent, alkali powder and water for beating to obtain a wet slurry; in terms of mass percentage, the water content of the wet slurry is 40%; the bauxite and the secondary aluminum The mass ratio of ash is 1:0.05; the total equivalent ratio of the limestone to the bauxite and the secondary aluminum ash is 1.80:1; the quality of the curing agent to the bauxite and the secondary aluminum The ratio of the total ash mass is 0.03:1; the total equivalent ratio of the alkali powder to the bauxite and the secondary aluminum ash is 0.96:1;

[0045] The wet slurry is passed into the sintering equipment, mixed with the secondary aluminum ash, and then sintered to obtain sintered clinker; the s...

Embodiment 2

[0048] A method for recycling aluminum in secondary aluminum ash, said method comprising the steps of:

[0049] Pass the secondary aluminum ash to be treated into the sintering equipment in a dry method; the particle size of the secondary aluminum ash is <1mm;

[0050] Mix bauxite, limestone, curing agent, alkali powder and water for beating to obtain a wet slurry; in terms of mass percentage, the water content of the wet slurry is 42%; the bauxite and the secondary aluminum The mass ratio of ash is 1:0.1; the total equivalent ratio of the limestone to the bauxite and the secondary aluminum ash is 2:1; the quality of the curing agent to the bauxite and the secondary aluminum The ratio of the total ash mass is 0.045:1; the total equivalent ratio of the alkali powder to the bauxite and the secondary aluminum ash is 1:1;

[0051] The wet slurry is passed into the sintering equipment, mixed with the secondary aluminum ash, and then sintered to obtain sintered clinker; the sinteri...

Embodiment 3

[0054]A method for recycling aluminum in secondary aluminum ash, said method comprising the steps of:

[0055] Pass the secondary aluminum ash to be treated into the sintering equipment in a dry method; the particle size of the secondary aluminum ash is <1mm;

[0056] mixing and beating bauxite, limestone, curing agent, soda ash and water to obtain a wet slurry; in terms of mass percentage, the water content of the wet slurry is 40.5%; the bauxite and the secondary aluminum The mass ratio of ash is 1:0.15; the total equivalent ratio of the limestone to the bauxite and the secondary aluminum ash is 2.05:1; the quality of the curing agent to the bauxite and the secondary aluminum The ratio of the total ash mass is 0.06:1; the total equivalent ratio of the alkali powder to the bauxite and the secondary aluminum ash is 1.12:1;

[0057] The wet slurry is passed into the sintering equipment, mixed with the secondary aluminum ash, and then sintered to obtain sintered clinker; the si...

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Abstract

The invention relates to a method of recycling aluminum in secondary aluminum ash. The method comprises the following steps: introducing to-be-treated secondary aluminum ash into sintering equipment by way of a wet method; mixing and pulping bauxite, limestones, a curing agent, alkali powder and water to obtain wet slurry, wherein the water content of the wet slurry is 37-45% by mass; introducingthe wet slurry into the sintering equipment to be mixed with the secondary aluminum ash for sintering to obtain sintered clinker, wherein the sintering temperature is 1200-1300 DEG C and the sinteringtime is 20-60 min; and cooling the sintered clinker, adding an adjusting liquid and / or a purifying agent to dissolve out, carrying out solid-liquid separation after a dissolve-out reaction to obtainrefined liquor and solid residues, and recovering the refined liquor.

Description

technical field [0001] The invention belongs to the technical field of recycling waste resources in the aluminum industry, and in particular relates to a method for recycling aluminum in secondary aluminum ash. Background technique [0002] Aluminum ash is the product of the slag produced in the production process of electrolytic aluminum or cast aluminum after cooling and processing. Among them, the untreated aluminum ash is called primary aluminum ash, and the remaining aluminum ash after the primary aluminum ash is refined and recycled aluminum is called Known as the secondary aluminum ash, the secondary aluminum ash is a gray-black powder, mainly containing alumina, elemental aluminum, aluminum nitride, aluminum carbide and various impurities, which escape irritating and flammable gases and impurities when exposed to water The content is high, and there is a problem that there is a lack of a large-scale, resource-based, economical and environmentally friendly recycling m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C01F7/02
CPCC01F7/02C22B7/04Y02P10/20
Inventor 杜善国薛忠秀李海荣王少武刘伟徐爱勤
Owner 中铝山东有限公司
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