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Method for preparing aluminum oxide from aluminiferous material

A technology of alumina and silica, applied to the preparation of aluminum hydroxide, chemical instruments and methods, preparation of alumina/hydroxide, etc.

Inactive Publication Date: 2013-01-09
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production of alumina by electrothermal method is still in the research stage

Method used

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  • Method for preparing aluminum oxide from aluminiferous material
  • Method for preparing aluminum oxide from aluminiferous material
  • Method for preparing aluminum oxide from aluminiferous material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] After the fly ash that has been crushed and ground to less than 80 μm is removed by magnetic separation, it is mixed with ammonium sulfate and water in a mass ratio of 1:3.2:5 (the molar ratio of alumina and ammonium sulfate is 1:6), and the ℃ roasting reaction for 5h, and absorb the ammonia gas generated during the reaction with water. The roasted product is lowered in temperature, dissolved by adding water, and then separated into solid and liquid. The filtrate is aluminum ammonium sulfate solution, and the filter residue is aluminum extraction slag.

[0087] After the ammonium aluminum sulfate solution is purified by recrystallization to remove impurities such as iron, pure ammonium aluminum sulfate crystals are prepared. Aluminum ammonium sulfate crystals are dehydrated at 200°C for 3 hours, decomposed at 550°C for 3 hours, and then heated to 1200°C for 5 hours to obtain alumina.

[0088] Mix aluminum extraction slag with 50% sulfuric acid solution at a mass volum...

Embodiment 2

[0091] After the bauxite that has been crushed and ground to less than 80 μm is removed by magnetic separation, it is mixed with ammonium sulfate and water in a mass ratio of 1:5:7.2 (the molar ratio of alumina and ammonium sulfate is 1:6), and the ℃ roasting reaction for 6h, the gas released during the reaction is absorbed by water. The roasted product is cooled, dissolved in water, and then separated into solid and liquid. The filtrate is aluminum ammonium sulfate solution, and the filter residue is aluminum extraction slag.

[0092] After the ammonium aluminum sulfate solution is purified by recrystallization to remove impurities such as iron, pure ammonium aluminum sulfate crystals are prepared. Dissolve pure aluminum ammonium sulfate crystals with water, add ammonia water to control the [Al 3+ ] The initial concentration is 0.15mol L -1 , the pH value is 4.0, and aluminum hydroxide precipitates are prepared. The solution after the aluminum hydroxide is prepared is an ...

Embodiment 3

[0096] Mix the crushed and ground high-iron bauxite with ammonium sulfate and water at a mass ratio of 1:3:4.3 (the molar ratio of alumina and ammonium sulfate is 1:8), and roast at 500°C for 4 hours. The gas released during the reaction was absorbed with water. The roasted product is cooled, dissolved in water, and then separated into solid and liquid. The filtrate is aluminum ammonium sulfate solution, and the filter residue is aluminum extraction slag.

[0097] Feed ferrous oxide ions in the air into the ammonium aluminum sulfate solution, and use the yellow ammonium ironite method to remove iron. Add ammonia to the ammonium aluminum sulfate solution after iron removal to adjust the pH value to 4.5, and precipitate aluminum hydroxide. Aluminum hydroxide is heated to 1200°C and calcined for 3 hours to produce alumina. The filtrate is ammonium sulfate solution, which is used for roasting reaction after concentration.

[0098] The aluminum extraction slag is mainly iron ox...

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Abstract

The invention provides a method for preparing aluminum oxide and other products from aluminiferous materials such as bauxite, high iron bauxite, alunite, kaoline, alumina, fly ash, coal gangue, aluminum ash, nepheline, clay and the like. The method comprises the following steps: (1) crushing, grinding and mixing the aluminiferous materials with ammonium sulfate and then roasting; (2) dissolving the roasted product (clinker aggregate) in water, and filtering to obtain aluminum ammonium sulfate solution and filter residues; (3) carrying out deferrization, aluminum deposition or recrystallization on the aluminium ammonum sulfate solution with ammonia to prepare aluminum oxide, and meanwhile, recycling the ammonium sulfate; (4) preparing silicon dioxide from the filter residues, and taking the remaining residues containing ferrum as the raw material for ironmaking. The method is suitable for treating various aluminiferous materials, has the advantages of simple technical process, simple equipment, no emission of solid, liquid and gas wastes, and no secondary pollution, and realizes the high-added-value green complex utilization of the aluminiferous materials such as bauxite, high ironbauxite, alunite, kaoline, alumina, fly ash, coal gangue, aluminum ash, nepheline, clay and the like.

Description

technical field [0001] The invention relates to a method for processing aluminum-containing materials, in particular to aluminum-containing materials such as bauxite, high-iron bauxite, alunite, kaolin, bauxite, fly ash, coal gangue, aluminum ash, nepheline, and clay Process for preparing ammonium aluminum sulfate, alumina and silica products. Background technique [0002] Bauxite, high-iron bauxite, alunite, kaolin, bauxite, nepheline, clay, fly ash, coal gangue, aluminum ash and other aluminum-containing materials are aluminum-containing minerals or aluminum-containing solid waste, usually containing A large amount of silicon dioxide and iron, calcium and other oxides. Among them, the main aluminum-containing minerals in bauxite, high-iron bauxite, and bauxite are gibbsite and gibbsite; the main aluminum-containing minerals in kaolin, nepheline, clay, fly ash, and coal gangue are Aluminosilicate; the main aluminum-containing mineral in alunite is potassium aluminum sulfa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/26C01F7/32C01F7/34
Inventor 翟玉春吴艳牟文宁王佳东王伟
Owner NORTHEASTERN UNIV LIAONING
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