A method for producing alumina by treating low-aluminum minerals by acid method

A technology of alumina and minerals, which is applied in the field of non-ferrous metal mineral treatment and processing, and acid treatment of low-aluminum minerals to produce alumina. It can solve the problems of poor aluminum ion selectivity and difficulty in removing iron, and achieve environmental friendliness and equipment. The effect of low operating cost and low equipment investment

Active Publication Date: 2016-10-26
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the alkali method, the advantage of the acid method to produce alumina is that it can process high-silicon aluminum-containing non-bauxite ores, but the selectivity of the acid to aluminum ions is not good, and there is a disadvantage of difficulty in removing iron (including other impurities)

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  • A method for producing alumina by treating low-aluminum minerals by acid method
  • A method for producing alumina by treating low-aluminum minerals by acid method
  • A method for producing alumina by treating low-aluminum minerals by acid method

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Embodiment 1

[0056] A method for producing alumina by acid treatment of low-aluminum minerals of the present invention, comprising the following steps:

[0057] 1) Wash and dry the minerals, roast them at 650-700°C for 25-30 minutes, and then grind them to a particle size of -200 mesh to obtain aluminum ore powder.

[0058] 2) Add the aluminum ore powder after step 1) to hydrochloric acid with a mass concentration of 15-16% (industrial concentrated hydrochloric acid is diluted with water at a ratio of 1:1), and then leaching in two stages of countercurrent at 90-95°C, each leaching time is 120 ~150min; the mass ratio of the total amount of acid to aluminum ore powder is 3.95~4.05. After filtration, the total dissolution rate of aluminum was 90.6%. The composition and content (g / L) of the leach solution are as follows: aluminum 40.0; iron 1.44; calcium 0.56; magnesium 0.62.

[0059] 3) Take the leaching solution and heat it up to 95°C in the impurity removal reaction kettle, then add 12.8...

Embodiment 2

[0064] A method for producing alumina by acid treatment of low-aluminum minerals of the present invention, comprising the following steps:

[0065] 1) Wash and dry the minerals, roast them at 650-700°C for 25-30 minutes, and then grind them to a particle size of -200 mesh to obtain aluminum ore powder.

[0066] 2) Add the aluminum ore powder after step 1) to hydrochloric acid with a mass concentration of 15-16% (industrial concentrated hydrochloric acid is diluted with water at a ratio of 1:1), and then leaching in two stages of countercurrent at 90-95°C, each leaching time is 120 ~150min; the mass ratio of the total amount of acid to aluminum ore powder is 3.95~4.05. After filtration, the total dissolution rate of aluminum was 90.6%. The composition and content (g / L) of the leach solution are as follows: aluminum 40.0; iron 1.44; calcium 0.56; magnesium 0.62.

[0067] 3) Take the leaching solution and heat it up to 80°C in the impurity removal reaction kettle, and then add ...

Embodiment 3

[0072] A method for producing alumina by acid treatment of low-aluminum minerals of the present invention, comprising the following steps:

[0073] 1) Wash and dry the minerals, roast them at 650-700°C for 25-30 minutes, and then grind them to a particle size of -200 mesh to obtain aluminum ore powder.

[0074] 2) Add the aluminum ore powder after step 1) to hydrochloric acid with a mass concentration of 15-16% (industrial concentrated hydrochloric acid is diluted with water at a ratio of 1:1), and then leaching in two stages of countercurrent at 90-95°C, each leaching time is 120 ~150min; the mass ratio of the total amount of acid to aluminum ore powder is 3.95~4.05. After filtration, the total dissolution rate of aluminum was 90.6%. The composition and content (g / L) of the leach solution are as follows: aluminum 40.0; iron 1.44; calcium 0.56; magnesium 0.62.

[0075] 3) Take the leaching solution and heat it up to 50°C in the impurity removal reaction kettle, then add 13.5...

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Abstract

The invention discloses a method for producing aluminum oxide by virtue of acid treatment of a low-aluminum mineral. The method comprises the following steps: (1) milling the low-aluminum mineral until the particle size is 200 meshes to obtain aluminum mineral powder; (2) adding acid to dissolve the aluminum mineral powder to obtain an aluminum salt solution; (3) adding a hexafluoro-aluminate crystal into the aluminum salt solution to perform impurity removal, thereby obtaining a purified aluminum salt solution; (4) adding alkali metal fluoride into the purified aluminum salt solution, filtering and washing to obtain a crystal and a crystal mother solution; (5) adding alkali into the crystal to perform reaction, filtering and washing after the reaction to obtain crystal aluminum hydroxide and alkali metal fluoride, and returning the alkali metal fluoride to the step (4); and (6) filtering, washing, drying and calcining crystallized aluminum hydroxide to obtain aluminum oxide. The purity of the aluminum oxide prepared by the process provided by the invention reaches more than 98.5%, and the aluminum oxide contains extremely less impurities. The process provided by the invention can ensure that a lot of low-aluminum non-bauxite resources can be utilized.

Description

technical field [0001] The invention relates to a method for treating and processing non-ferrous metal minerals, in particular to a method for producing alumina by treating low-aluminum minerals with an acid method, and belongs to the field of mineral processing. Background technique [0002] At present, there are two main methods of producing alumina at home and abroad: alkaline method and acid method. [0003] Alkali method is to use alkali to treat aluminum-containing raw materials, so that the alumina in it is converted into water-soluble sodium aluminate; impurities such as iron in the raw materials become insoluble and separated, and alumina is produced after treatment. Its advantage is that it is easy to remove iron, but it is difficult to remove silicon, so it is only suitable for high-grade bauxite with low silicon content. [0004] The acid method is to treat aluminum-containing raw materials with inorganic acids to obtain the corresponding aluminum salt solution,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 胡启阳李新海王志兴郭华军彭文杰
Owner CENT SOUTH UNIV
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