Method for leaching out inpurity iron in bauxite by chemical-biological method

A biological method and ore technology, applied in the direction of improving process efficiency, etc., can solve problems such as low cost and energy consumption, long iron removal time, and slow biological reaction speed

Inactive Publication Date: 2006-05-24
GUIZHOU BRANCH CHINA ALUMINUM IND
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AI Technical Summary

Problems solved by technology

Most of the physical method of iron removal adopts the floating-magnetic combined process, which has a certain effect on the removal of iron minerals, but the effect is poor, and it is ineffective for the removal of iron in bauxite grades; the chemical method of iron removal is mostly studied by hydrochloric acid method and chlorination method , the iron removal effect is better than the physical method, and there have been some researches on the chemical iron removal mechanism and kinetics, but the environmental protection problem has not been well resolved; the biological method of iron removal technology has low cost and energy consumption, no secondary The advantages of pollution, but the biological reaction is slow, the iron removal time is long, and the iron removal rate is not high

Method used

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  • Method for leaching out inpurity iron in bauxite by chemical-biological method

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preparation example Construction

[0020] (1) Preparation of leaching solution

[0021] Chase Medium: NaNO 3 2g, K 2 HPO 4 1g, KCl 0.5g, MgSO 4 0.5g, FeSO 4 0.01g, 30g molasses, 1000mL water, natural pH, sterilized at 121°C for 20 minutes; after cooling the culture medium, inoculate the mycelia or spores of Aspergillus niger strain; culture conditions: temperature 25°C-35°C, culture time 3 days- 5 days; when the pH of the culture solution drops to 1.5-2.5, filter the culture solution to remove the mycelium, adjust the pH of the fermentation solution to 0.5-1.0 with sulfuric acid, and make a leachate;

[0022] (2) Ore leaching and iron removal

[0023] After the leach solution is prepared, stir and leach impurity iron in the ore at 80°C-90°C; use a stirring intensity of 150r / min-250r / min, a pulp concentration of 10%-30%, and a treatment time of 6h, and then filter. washing.

Embodiment 1

[0025] First prepare the leaching solution; Cha's medium: NaNO 3 2g,K 2 HPO 4 1g, KCl 0.5g, MgSO 4 0.5g, FeSO 4 0.01g, molasses 30g, water 1000mL, pH natural, sterilized at 121°C for 20min. After cooling the medium, inoculate Aspergillus niger YJY-1 # The mycelium or spores of the strain. The culture conditions are: temperature 35° C., rotation speed 150 r / min, and culture for 5 days. When the pH of the culture solution is reduced to 1.5, the culture solution is filtered to remove the mycelium, and the fermented solution is adjusted to pH 0.5 with sulfuric acid to prepare a leaching agent.

[0026] take 1 # The iron oxide content in the ore is 13.18%. The ore is crushed and ball-milled until the particle size is less than 174μm, and then leached. The leaching conditions are: leaching temperature 80°C, solid content weight concentration of the pulp during leaching is 10%, shaking table speed 150r / min, The leaching time is 6h. Filtrate and wash while hot, and detect...

Embodiment 2

[0028] First prepare the leaching solution; Cha's medium: NaNO 3 2g,K 2 HPO 4 1g, KCl 0.5g, MgSO 4 0.5g, FeSO 4 0.01g, molasses 30g, water 1000mL, pH natural, sterilized at 121°C for 20min. After cooling the medium, inoculate Aspergillus niger YJY-1 # The mycelium or spores of the strain. The culture conditions are as follows: the temperature is 25° C., the rotation speed is 250 r / min, and the culture time is 5 days. When the pH of the culture solution is reduced to 2.5, the culture solution is filtered to remove the mycelium, and the fermented solution is adjusted to pH 1.0 with sulfuric acid to prepare a leaching agent.

[0029] take 2 # The content of iron oxide in the ore is 4.31%, 2 # The ore is bauxite beneficiation tailings, directly leached. The ore leaching conditions are: leaching temperature 85°C, pulp solid content weight concentration 20%, shaker speed 200r / min, leaching time 6h. Filtrate and wash while hot, and detect the content of iron, aluminum a...

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Abstract

The invention relates to a biology and chemical method to remove the impurity iron in bauxite ore. The feature is that it adopts fermentation liquor leaching out iron of aspergillus niger bacterium that has strong ability to produce acid. 1-4% vitriol is added into the fermentation liquor as leaching out agent. After process by the method, the ferric oxide content is 0.4-0.9% and the aluminum leaching out ratio is less than 1.0%.

Description

technical field [0001] A chemical-biological method for leaching impurity iron in bauxite ore, which relates to a chemical-biological method for removing aluminum from tailings produced after flotation of iron-containing bauxite ore, especially low-grade bauxite The method of impurity iron in soil ore. Background technique [0002] When bauxite ore is used as a raw material for refractory materials, it is necessary to reduce the content of iron minerals in the ore, because the iron and titanium impurities in the ore will cause the refractory material to appear glass phase prematurely at high temperature and reduce the performance of the refractory material. Iron minerals exist in bauxite in the form of: hematite, goethite, lepidocite and their hydrates, as well as limonite, colloidal ferric hydroxide, magnetite and maghemite, etc. [0003] The research methods of bauxite beneficiation and iron removal can be divided into physical method, chemical method and biological metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18
CPCY02P10/20
Inventor 周吉奎李军亮李花霞曹慧君
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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