Method for preparing chemical aluminum oxide by using andalusite as raw material

A technology of andalusite and alumina, which is applied in the field of producing chemical alumina, can solve the problem of unusable tailings and achieve low cost, simple process and good effect

Inactive Publication Date: 2008-05-21
蹬口县欧凯红柱石矿业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of this invention is to propose a method for producing chemical alumina by using tailings after andalusite ben

Method used

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  • Method for preparing chemical aluminum oxide by using andalusite as raw material

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Experimental program
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Effect test

Embodiment 1

[0045] The grade of alumina contained in the andalusite tailings is 45wt%, containing 46wt% of silicon oxide, 2wt% of ferric oxide, and the balance is other impurities.

[0046] The first step: crushing andalusite tailings into balls

[0047] After uniformly mixing 45 parts by weight of andalusite ore with a particle size less than 0.5 mm and 55 parts by weight of an activator with a particle size less than 0.5 mm, pellets with a particle size of 10 mm are obtained through a pelletizing machine;

[0048] Described activator is added the calcium fluoride CaF of 5 weight parts by the calcium oxide CaO of 100 weight parts 2 composition;

[0049] The second step: roasting andalusite self-grinding material

[0050] Roast the pellets prepared in the first step at a temperature of 1300°C for 60 minutes to obtain a calcined material;

[0051] Then the calcined material is moved out of the roasting furnace along with the crucible, and when the temperature of the calcined material in...

Embodiment 2

[0073] The grade of alumina contained in the andalusite tailings is 35wt%, containing 50wt% of silicon oxide, 8wt% of ferric oxide, and the balance is other impurities.

[0074] The first step: crushing andalusite tailings into balls

[0075] After uniformly mixing 50 parts by weight of andalusite ore with a particle size less than 0.5 mm and 50 parts by weight of an activator with a particle size less than 0.5 mm, pellets with a particle size of 60 mm are obtained through a pelletizing machine;

[0076] Described activator is added the calcium fluoride CaF of 1 weight part by the calcium oxide CaO of 100 weight parts 2 composition;

[0077] The second step: roasting andalusite self-grinding material

[0078] Roast the pellets prepared in the first step at a temperature of 1100°C for 90 minutes to obtain a calcined material;

[0079] Then the calcined material is moved out of the roasting furnace along with the crucible. When the temperature of the calcined material in the ...

Embodiment 3

[0103] The grade of alumina contained in the andalusite tailings is 52wt%, containing 38wt% of silicon oxide, 4wt% of ferric oxide, and the balance is other impurities.

[0104] The first step: crushing andalusite tailings into balls

[0105] After uniformly mixing 40 parts by weight of andalusite ore with a particle size less than 0.5 mm and 60 parts by weight of an activator with a particle size less than 0.5 mm, pellets with a particle size of 30 mm are obtained through a pelletizing machine;

[0106] Described activator is added the calcium fluoride CaF of 3 weight parts by the calcium oxide CaO of 100 weight parts 2 composition;

[0107] The second step: roasting andalusite self-grinding material

[0108] Roasting the pellets prepared in the first step at a temperature of 1200°C for 90 minutes to obtain a calcined material;

[0109] Then the calcined material is moved out of the roasting furnace along with the crucible. When the temperature of the calcined material in ...

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Abstract

The invention discloses a method for preparing chemical alumina by using andalusite as a raw material. The preparation of chemical alumina is from the tailings of andalusite ore dressing through ball making, roasting, multi-stage separation, adding additives and granulation. The chemical alumina with a purity of 99.5-99.999% is extracted from the ore as a raw material, so that the andalusite resource can be comprehensively utilized, which not only saves resources, but also protects the environment.

Description

technical field [0001] The present invention relates to an extraction method, more particularly, refers to a method for producing chemical alumina by using tailings after beneficiation of andalusite as raw material. Background technique [0002] Chemical alumina is non-metallurgical alumina series, mainly including special ceramic alumina series, activated alumina series, granulated powder series, alumina series for special refractory materials, alumina series for grinding and polishing, etc., widely used in chemical industry, Ceramics, refractory materials and military industries, etc., the consumption is very large, and the market prospect is broad. [0003] At present, the raw material for the world's production of chemical alumina is bauxite. However, if andalusite ore is selected from andalusite concentrate through ore dressing as a raw material for refractory materials, the alumina grade needs to be greater than 57%, and the yield is only 12-15%. Utilization, stackin...

Claims

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Application Information

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IPC IPC(8): C01F7/30
Inventor 卢惠民苏学民韩国雄
Owner 蹬口县欧凯红柱石矿业有限公司
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