Method for extracting aluminum oxides from aluminum-containing waste residues

An alumina and aluminum waste slag technology, applied in the removal of alumina/aluminum hydroxide, solid waste, etc., can solve the problems of difficult operation, limited utilization, fly ash pollution, etc., and achieve efficient resource utilization methods and products. The effect of high purity and low iron content

Active Publication Date: 2013-12-04
SHANXI UNIV +1
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, coal gangue and/or fly ash are mainly used in low-value aspects such as construction engineering and building materials. or fly ash pollution problem
Red mud is a solid waste residue produced in the alumina production process. It has a high alkali content, which makes it difficult to comprehensively utilize red mud. The current comprehensive ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Ingredients: Take 100g of coal gangue with an alumina content of 22.9%, a silica content of 41.1%, and add 175g of red coal gangue with an alumina content of 23.4%, a silica content of 19.1%, and a sodium oxide content of 9.4%. Mud and 38g sodium carbonate, mix thoroughly, the molar ratio of Na, Al, Si in the ingredients is about 1:1:1;

[0021] (2) Sintering: Sinter the ingredients at 800°C to obtain 261g of sintered clinker;

[0022] (3) Acid leaching: 850ml of hydrochloric acid solution with a mass concentration of 21% was reacted with sintered clinker at 100°C, solid-liquid separation, washing, and fixed volume to obtain 1200ml of aluminum salt solution containing aluminum chloride;

[0023] (4) Concentrated crystallization: Concentrate the aluminum salt solution until white crystals are precipitated to obtain 487ml of concentrated solution, then add 1220ml of concentrated hydrochloric acid with a mass concentration of 36% to the concentrated solution, stir, let...

Embodiment 2

[0026] (1) Ingredients: Take 100g of coal-fired fly ash with an alumina content of 35.3%, a silica content of 50.9%, and add 110g of an alumina content of 23.4%, a silica content of 19.1%, and a sodium oxide content of 9.4%. The red mud and 52g of sodium carbonate are fully mixed, and the molar ratio of Na, Al, and Si in the ingredients is about 1.1:1:1;

[0027] (2) Sintering: Sinter the ingredients at 850°C to obtain 232g of sintered clinker;

[0028] (3) Acid leaching: 900ml of hydrochloric acid solution with a mass concentration of 19% was reacted with sintered clinker at 100°C, solid-liquid separation, washing, and fixed volume to obtain 1200ml of aluminum salt solution containing aluminum chloride;

[0029] (4) Concentrated crystallization: Concentrate the aluminum salt solution until white crystals are precipitated to obtain 476ml of concentrated solution, then add 1200ml of concentrated hydrochloric acid with a mass concentration of 36% to the concentrated solution, st...

Embodiment 3

[0032] (1) Ingredients: Take 100g of boiler slag with an alumina content of 32.7%, a silica content of 45.3%, and add 80g of red slag with an alumina content of 23.4%, a silica content of 19.1%, and a sodium oxide content of 9.4%. Mud and 35g sodium carbonate, mix thoroughly, the molar ratio of Na, Al, Si in the ingredients is about 0.9:1:1;

[0033] (2) Sintering: Sinter the ingredients at 900°C to obtain 193g of sintered clinker;

[0034] (3) Acid leaching: 800ml of hydrochloric acid solution with a mass concentration of 22% was reacted with sintered clinker at 100°C, solid-liquid separation, washing, and fixed volume to obtain 1200ml of aluminum salt solution containing aluminum chloride;

[0035] (4) Concentrated crystallization: Concentrate the aluminum salt solution until white crystals are precipitated to obtain 459ml of concentrated solution, then add 1100ml of concentrated hydrochloric acid with a mass concentration of 34% to the concentrated solution, stir, let stand...

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Abstract

The invention discloses a method for extracting aluminum oxides from aluminum-containing waste residues. The method comprises the following steps: mixing coal gangue and/or coal ash with a certain amount of red mud and Na2CO3, sintering to obtain sintered clinker with high reaction activity, performing acid leaching by a hydrochloric acid solution to form an aluminum salt solution, adding concentrated hydrochloric acid with the mass concentration of 30-37% to prepare aluminum chloride crystals, dissolving the aluminum chloride crystals, separating out aluminum hydroxide by ammonia precipitation, calcining at the temperature of 400-1300 DEG C to obtain aluminum oxides with different crystal forms. The method is simple in process, the prepared aluminum oxides are low in iron content and high in purity, and the method is a good method for co-processing the red mud and the coal gangue and/or the coal ash.

Description

technical field [0001] The invention belongs to the field of comprehensive waste utilization and relates to a method for co-processing red mud, coal gangue and / or fly ash to extract high-purity alumina. Background technique [0002] During the mining, washing and processing of coal, a large amount of coal gangue is produced, and a large amount of fly ash is produced during the combustion process, which seriously damages the ecological environment. At present, coal gangue and / or fly ash are mainly used in low-value aspects such as construction engineering and building materials. or fly ash pollution problem. Red mud is a solid waste residue produced in the alumina production process. It has a high alkali content, which makes it difficult to comprehensively utilize red mud. The current comprehensive utilization rate is less than 5% ("Comprehensive Utilization of Bulk Industrial Solid Waste" Twelve "Five" Plan"), a large amount of stockpiling has brought about very serious en...

Claims

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Application Information

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IPC IPC(8): C01F7/02B09B3/00
Inventor 郭彦霞李瑶瑶程芳琴薛芳斌范越强
Owner SHANXI UNIV
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