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Method for preparing calcium aluminate by synergistic treatment of high-magnesium aluminum ash and fly ash

A high-magnesium aluminum ash and synergistic processing technology, which is applied in the preparation of calcium aluminate, alkaline earth metal aluminate/alumina/aluminum hydroxide, and aluminum silicate, can solve the problems of low synthesis temperature, high raw material cost, and production cost. Low-level problems, to achieve the effect of high reactivity and high decomposition rate

Active Publication Date: 2021-04-06
CENT SOUTH UNIV
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Problems solved by technology

[0006] Aiming at technical problems such as the high cost of raw materials used in the preparation of calcium aluminate in the prior art and the corrosion of equipment, the purpose of the present invention is to provide a method for preparing calcium aluminate through synergistic processing of high-magnesium aluminum ash slag and fly ash. Method Using two kinds of industrial solid wastes as raw materials, wet ball milling is used to activate active ingredients and leach soluble impurities, and then combine high-temperature solid-state reaction to realize the transformation of magnesium-aluminum spinel and promote the formation of calcium aluminate, and finally obtain aluminum Calcium aluminate products with high calcium acid content can be used for steelmaking desulfurization. This method is simple to operate, low in synthesis temperature, high in conversion rate, low in production cost, and environmentally friendly, meeting the requirements of industrial production

Method used

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  • Method for preparing calcium aluminate by synergistic treatment of high-magnesium aluminum ash and fly ash
  • Method for preparing calcium aluminate by synergistic treatment of high-magnesium aluminum ash and fly ash

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Embodiment 1

[0029] Using aluminum ash (65.3% aluminum content, 6.0% magnesium oxide content) and high-alumina fly ash (32.0% aluminum content) from a recycled aluminum plant as raw materials, the high-magnesium aluminum ash slag, fly ash, and quicklime were mixed to control The molar ratio of Al:Ca is 1:1.20, and the molar ratio of Mg:Si is 1:1.15; the mixed material is subjected to wet ball milling, the liquid-solid ratio of the ball milling is 1:1, the pH of the ball milling is adjusted to 12 by NaOH, and the ball milling speed is 30r / min, The ball milling time is 3 hours; after the ball milling activation is completed, the material is washed and solid-liquid separated, and finally the mixed material is placed in an air atmosphere for high-temperature roasting, the roasting temperature is 1320 ° C, and the roasting time is 180 min. The roasted product can be used for steelmaking desulfurization calcium aluminate products. After testing, the relative content of calcium aluminate in the p...

Embodiment 2

[0031] Using aluminum ash (65.3% aluminum content, 6.0% magnesium oxide content) and high-alumina fly ash (32.0% aluminum content) from a recycled aluminum plant as raw materials, the high-magnesium aluminum ash slag, fly ash, and quicklime were mixed to control The molar ratio of Al:Ca is 1:1.32, and the molar ratio of Mg:Si is 1:1.05; the mixed material is subjected to wet ball milling, the liquid-solid ratio of the ball milling is 2:1, the pH of the ball milling is adjusted to 12 by NaOH, and the ball milling speed is 50r / min ball milling The time is 5 hours; after the ball mill activation is completed, the material is washed and separated from solid and liquid, and finally the mixed material is placed in an air atmosphere for high-temperature roasting, the roasting temperature is 1380 ° C, and the roasting time is 120 min. The roasted product can be used for steelmaking desulfurization Calcium aluminate products. After testing, the relative content of calcium aluminate in ...

Embodiment 3

[0033] Using aluminum ash (70.3% aluminum content, 12.0% magnesium oxide content) and high-aluminum fly ash (45.3% aluminum content) from a secondary aluminum plant as raw materials, the high-magnesium aluminum ash slag, fly ash, and quicklime were mixed to control The molar ratio of Al:Ca is 1:1.25, and the molar ratio of Mg:Si is 1:1.10; the mixed material is subjected to wet ball milling, the liquid-solid ratio of the ball milling is 3:1, the pH of the ball milling is adjusted to 13 by NaOH, and the milling speed is 20r / min, The ball milling time is 4 hours; after the ball milling activation is completed, the material is washed and solid-liquid separated, and finally the mixed material is placed in an air atmosphere for high-temperature roasting, the roasting temperature is 1350 ° C, and the roasting time is 155 min. The roasted product can be used for steelmaking desulfurization calcium aluminate products. After testing, the relative content of calcium aluminate in the pro...

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Abstract

The invention discloses a method for preparing calcium aluminate by synergistic treatment of high-magnesium aluminum ash and fly ash, which comprises the following steps: carrying out wet ball milling on high-magnesium aluminum ash, fly ash and quick lime, and sequentially carrying out washing, solid-liquid separation and roasting treatment on the ball-milled material to obtain a calcium aluminate product. According to the method, a calcium aluminate series product capable of being used for iron and steel smelting desulfurization is obtained by taking the aluminum ash generated in the aluminum smelting processing process as a raw material, so that the comprehensive utilization of hazardous wastes is realized, a relatively high economic value can be obtained, and the method is simple to operate and environment-friendly, and meets the industrial production requirements.

Description

technical field [0001] The present invention relates to a method for preparing calcium aluminate, in particular to a method for preparing calcium aluminate by synergistically treating two solid wastes, high-magnesium aluminum ash and fly ash, and belongs to the field of recycled metals and comprehensive utilization of solid waste field. Background technique [0002] Aluminum ash is a hazardous waste produced in high-temperature processes such as aluminum electrolysis, aluminum alloy production, and waste aluminum recycling. Aluminum ash contains fluoride, aluminum nitride, soluble salts, heavy metals, and other substances that are toxic and harmful to the environment and human body. According to incomplete statistics, the annual production of aluminum ash is as high as more than 5 million tons. The current way to deal with aluminum ash in China is mainly to accumulate or bury it in landfills, which will cause serious environmental and ecological problems. Due to its toxic,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/16C01B33/26C21C7/064
CPCC01F7/164C01B33/26C21C7/0645C01P2004/80
Inventor 张元波苏子键刘康姜涛李光辉范晓慧刘硕刘继成涂义康王嘉侯炜赵雪娟朱应贤林坤王琰成相霖
Owner CENT SOUTH UNIV
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