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Method for ore dressing and desilicating mixed type bauxite

A bauxite and mixed technology, applied in chemical instruments and methods, flotation, wet separation, etc., can solve the problems of separation of aluminum minerals and silicon minerals, fine grinding products, and great difficulty, so as to expand resources The effect of supply, high recovery rate, and strong operability

Active Publication Date: 2008-05-14
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The flotation desiliconization of gibbsite type, boehmite, and diaspore mixed bauxite is more difficult. The main problem is that low hardness minerals such as gibbsite, after grinding Severe mudification occurs, that is, the particle size of the grinding product is too fine, and it is difficult to separate aluminum minerals and silicon minerals by flotation

Method used

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  • Method for ore dressing and desilicating mixed type bauxite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Taking the low-grade gibbsite-type bauxite ore in Fiji as the sample, the main phase composition of the ore is gibbsite and kaolin. The chemical composition analysis of the raw ore is shown in Table 1, and the phase analysis is shown in Table 2.

[0023] The ore is selectively crushed by a jaw crusher to a particle size of -20mm, and water is added to adjust the slurry. The concentration of the slurry is 20% to 30%. The slurry is scrubbed by a cylinder washing machine for 5 to 10 minutes. The high-quality kaolin is separated from the gibbsite particles under the action of hydraulic force and stirring, and the coarse particles of +1mm are sieved by spiral vibration, and the A / S of the coarse particles is greater than 8, which can be directly used as concentrates; For gibbsite and kaolin, use spiral classifier to classify, +0.1~+0.074mm particles are selectively ground by ball mill, overflow particle size is -0.074mm, content is 85~90%, and sieved -0.1 ~0.074mm ore pu...

Embodiment 2

[0031] Taking a medium-low grade gibbsite and boehmite mixed bauxite in Saudi Arabia as a sample, the phase composition of the ore is mainly gibbsite, boehmite, kaolin and a small amount of quartz. The chemical property analysis of the raw ore is shown in Table 4, and the phase analysis is shown in Table 5.

[0032] The ore is selectively broken down to a particle size of -20mm by a jaw crusher, and water is added to adjust the slurry. The concentration of the slurry is 30-60%. The slurry is mechanically stirred in the mixing tank for 15-20min, and the gibbsite and boehmite particles It will selectively disintegrate with kaolin, vibrating screening is used for the pulp, and the coarse particles of +0.1mm enter the pair of rollers for further grinding, so that the ore is further dissociated. Grinding products are vibrating and sieving, and the +0.074mm is mainly quartz sand, and the A / S is lower than 1.5, which is directly discarded as tailings; the -0.1mm ore pulp and -0.074mm...

Embodiment 3

[0040]A medium-low grade diaspore and boehmite mixed bauxite in Chongqing, China was used as the sample. The phase composition of the ore is mainly diaspore, boehmite, kaolin and illite. The chemical property analysis of the raw ore is shown in Table 7, and the phase analysis is shown in Table 8.

[0041] The ore is selectively crushed by a jaw crusher to a particle size of -20mm, and water is added to adjust the slurry. The concentration of the slurry is 30-60%. The slurry is mechanically stirred in a mixing tank with a small amount of steel balls for 5-10 minutes. Boehmite , Kaolin and illite are soft and selectively disintegrated with diaspore, and the pulp is classified by spiral, and the coarse particles of +0.2mm are classified into the ball mill for further grinding, so that the ore is further dissociated, and the overflow and - The 0.2mm pulp is mixed into the secondary grinding stage, and the content of -0.074mm in the overflow is 85-90%, and it enters the stirring t...

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Abstract

The invention relates to a mill run desiliconizing method for the mixed alumyte, in particular to a mill run desiliconizing method for the mixed alumyte with the gibbsite. The invention is characterized in that: smashing the mixed alumyte, adding the water to make slurry and make the ore smash, abstracting the coarse fraction mineral and the fine fraction mineral in the products by means of a screen separation craft or a grade craft, fine grinding the coarse fraction mineral which is abstracted, then mixing the milling grinding products and the fine fraction mineral which is abstracted by means of the screen separation craft or the grade craft, and carrying through a floatation. After the invention is carried into execution, the mill run desiliconization of the mixed alumyte with the gibbsite in middle or low grade is realized; the invention has a higher coefficient of recovery under the condition of guaranteeing A / S ratio of the ore concentrate. The invention has the advantages of simple and steady technological process, strong operability, capability of enlarging the resource supply of alumyte and providing a technical support for economy when the alumyte resources are needed, and important economic meaning and a social meaning for the sustainable development of the alumina industry.

Description

technical field [0001] The invention relates to a method for beneficiation and desiliconization of mixed bauxite, in particular to a method for beneficiation and desiliconization of mixed bauxite of gibbsite, boehmite and diaspore. Background technique [0002] Bauxite refers to the general term for ores that can be used in industry, with gibbsite, boehmite or diaspore as the main minerals. The production of alumina by the Bayer process is a more economical method, but the Bayer process usually requires the aluminum-silicon ratio of bauxite to be greater than 8. As we all know, the dissolution temperature of gibbsite bauxite is about 170°C, the dissolution temperature of boehmite bauxite is about 220°C, and the dissolution temperature of diaspore bauxite is about 280°C. ℃, therefore, gibbsite-type bauxite is a high-quality bauxite resource. The proven bauxite resources in the world are about 55-75 billion tons. Except for the 2.5-3 billion tons of diaspore-type bauxite in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B1/00B03B1/04B03D1/02B03D1/004B03D101/02B03D103/04
Inventor 李旺兴陈湘清陈占华陈志友
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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