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A method for efficient and clean resource utilization of secondary aluminum ash

A secondary aluminum recycling technology, applied in the direction of alumina/aluminum hydroxide, alkaline earth metal aluminate/alumina/aluminum hydroxide preparation, magnesium aluminate, etc., to achieve environmentally friendly treatment and high-value recycling Utilization, broad prospect of technology application, stable treatment effect

Active Publication Date: 2021-01-01
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies in the above-mentioned prior art, the present invention provides an efficient and clean secondary aluminum ash resource utilization method. The secondary aluminum ash undergoes low-temperature roasting, water washing to remove impurities, mixing and stirring, high-temperature synthesis and other processes, and finally the secondary aluminum ash is recycled. Aluminum ash is converted into high-value aluminum-based inorganic materials, which solves the environmental hazards caused by secondary aluminum ash and improves its resource utilization and product added value

Method used

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  • A method for efficient and clean resource utilization of secondary aluminum ash

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Embodiment 1

[0032] The present invention proposes a method for efficient and clean resource utilization of secondary aluminum ash, comprising the following steps:

[0033] 1) Low-temperature roasting: roast the secondary aluminum ash in a microwave heating kiln at 500°C for 10 hours to remove nitrogen, carbon and fluorine in the secondary aluminum ash to obtain stabilized aluminum ash.

[0034] 2) Washing and dehydration: Cool the above stabilized aluminum ash, then perform slurry washing according to the liquid-solid ratio of 5:1, wash off impurities such as sodium salt and potassium salt, filter and dehydrate to obtain a dehydrated filter cake, and the moisture content of the filter cake is 25%.

[0035] 3) Mixing and stirring: 40wt%-55wt% dehydrated filter cake and 45wt%-60wt% limestone powder are mechanically mixed to prepare mixed raw meal.

[0036] 4) High-temperature sintering: the above-mentioned mixed raw materials were sintered in a high-temperature furnace at 1400°C for 2 hour...

Embodiment 2

[0040] The present invention proposes a method for efficient and clean resource utilization of secondary aluminum ash, comprising the following steps:

[0041] 1) Low-temperature roasting: roast the secondary aluminum ash in an electric heating kiln at 800°C for 2 hours to remove nitrogen, carbon and fluorine in the secondary aluminum ash to obtain stabilized aluminum ash.

[0042] 2) Washing and dehydration: Cool the above stabilized aluminum ash, then perform slurry washing according to the liquid-solid ratio of 3:1, wash off impurities such as sodium salt and potassium salt, filter and dehydrate to obtain a dehydrated filter cake, and the moisture content of the filter cake is 20%.

[0043] 3) Mixing and stirring: 75wt%-90wt% dehydrated filter cake and 25wt%-10wt% silica powder are mechanically mixed to prepare mixed raw meal.

[0044] 4) High-temperature sintering: The above-mentioned mixed raw materials were sintered in a high-temperature furnace at 1500°C for 3 hours to p...

Embodiment 3

[0048] The present invention proposes a method for efficient and clean resource utilization of secondary aluminum ash, comprising the following steps:

[0049] 1) Low-temperature roasting: roast the secondary aluminum ash in a natural gas heating kiln at 650°C for 4 hours to remove nitrogen, carbon and fluorine in the secondary aluminum ash to obtain stabilized aluminum ash.

[0050] 2) Washing and dehydration: Cool the above-mentioned stabilized aluminum ash, then add water according to the liquid-solid ratio of 6:1 for slurry washing, wash off the sodium salt, potassium salt and other impurities, filter and dehydrate to obtain a dehydrated filter cake, the moisture content of the filter cake is 30%.

[0051] 3) Mixing and stirring: 68wt%-74wt% dehydrated filter cake and 26wt%-32wt% magnesite powder are mechanically mixed to prepare mixed raw meal.

[0052] 4) High-temperature sintering: The above-mentioned mixed raw materials were sintered in a high-temperature furnace at 1...

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Abstract

The invention discloses a high-efficiency clean resource utilization method for quadratic aluminum dust. The method comprises the following steps: performing low-temperature roasting treatment on quadratic aluminum dust, removing harmful elements such as nitrogen, carbon and fluorine, pulping, washing, desalting and dehydrating the quadratic aluminum dust, removing sodium salt, potassium salt andother impurity components, washing brine and evaporating and crystallizing by utilizing flue gas waste heat. The purified quadratic aluminum dust can serve as a raw material to be directly utilized, and after the quadratic aluminum dust is mechanically mixed with auxiliary materials (calcium-based, silicon-based and magnesium-based), an aluminum based inorganic material is prepared at a high temperature, and the sintering exhaust gas realizes up-to-standard discharge by virtue of dust removal and dry defluorinated purification. According to the technology in the invention, the quadratic aluminum dust can be safely, cleanly and efficiently treated and converted into the high-value aluminum based inorganic material to the greatest degree, and environmental-friendly treatment and high-value resource utilization of the quadratic aluminum dust can be realized.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of secondary aluminum ash, in particular to a method for clean and efficient resource utilization of secondary aluminum ash. Background technique [0002] Aluminum ash is a solid waste from aluminum smelting and aluminum processing. Primary aluminum ash contains a large amount of metallic aluminum (15-75%) and needs to be recycled. At present, the recovery technology of aluminum ash is mature, and the method of frying ash, rotary kiln, cooling and screening is mainly used, and the recovery rate is generally above 70%. Secondary aluminum ash is the fine ash left after recycling metal aluminum from primary aluminum ash. Secondary aluminum ash contains metallic aluminum, alumina, soluble salts such as NaCl and KCl, oxides such as Ca, Si and Fe, magnesium aluminum spinel, Na 3 AlF 6 , NaF, CaF 2 Fluoride, and a certain amount of AlN, Al 4 C 3 Wait. Among them, metal aluminum,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C01F7/16C01B33/26C01F7/02
CPCC01B33/26C01D3/04C01F7/162C01F7/164Y02P20/129Y02A50/2351
Inventor 刘万超刘中凯李帅康泽双练以诚闫琨李学鹏张永臣胡秋云和新忠张腾飞
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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