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, too fine particle size of grinding products, and great difficulty, so as to expand resources The effect of supply, high recovery rate, and strong operability

Active Publication Date: 2009-12-23
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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
  • Method for ore dressing and desilicating mixed type bauxite
  • Method for ore dressing and desilicating mixed type bauxite

Examples

Experimental program
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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 kaolin is separated from the gibbsite particles under the action of hydraulic power and stirring, and the coarse particles of +1mm are sieved by spiral vibration. The A / S of the coarse particles is greater than 8, which can be directly used as concentrates; the products of -1mm are mainly The gibbsite and kaolin are classified by a spiral classifier, and the particles of +0.1~+0.074mm are selectively ground by a ball mill. The 0.074mm ore pulp is mixed, and enters the mixing tank for mid-stirring and pulping. The adjusting agent is 3000g / t of sodium...

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 screened. 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 or...

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 method for beneficiating and desiliconizing mixed bauxite, in particular to a method for beneficiating and desiliconizing mixed bauxite containing gibbsite. It is characterized in that the mixed bauxite is crushed, and the ore is crushed by adding water to pulp, and then the fine-grained and coarse-grained minerals in the product are separated by screening or classification process, and the separated coarse-grained minerals are finely ground , and then the grinding product is mixed with the fine-grained minerals obtained by screening or classification, and then flotation is carried out. After the implementation of the present invention, the beneficiation and desiliconization of medium and low-grade gibbsite-containing mixed bauxite is realized, and under the condition of ensuring the A / S ratio of the concentrate, it has a high recovery rate; the process flow is simple, stable, and easy to operate. Strong; it expands the supply of bauxite resources, provides technical support for the economic utilization of such bauxite resources, and has important economic and social significance 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 Patents(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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