Mine milling method for improving particles size distribution of bauxite mine milling products

A particle size distribution, bauxite technology, applied in the direction of aluminum compounds, chemical instruments and methods, wet separation, etc., can solve the problems of excessive fine particles, uneven particle size distribution of bauxite grinding products, etc. Grinding, reducing sliming and overgrinding effects

Active Publication Date: 2007-10-24
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to aim at the deficiencies in the above-mentioned prior art, and to provide a method that can effectively overcome the inhomogeneous particle size distribution of the current bauxite grinding products, too many fine p

Method used

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  • Mine milling method for improving particles size distribution of bauxite mine milling products
  • Mine milling method for improving particles size distribution of bauxite mine milling products
  • Mine milling method for improving particles size distribution of bauxite mine milling products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A comprehensive ore sample 1, raw ore Al in Henan bauxite mining area 2 O 3 56.79%, SiO 2 14.90%, the ratio of aluminum to silicon is 3.81. The principle process flow chart used is shown in Figure 1, and the raw ore particle size composition is shown in Table 1. The specific process is as follows:

[0025] The comprehensive ore sample 1 is dry sieved by a vibrating screen with an aperture of 15mm. The +15mm particle size product enters a short mill with an aspect ratio of 0.8, and the mill discharge product and -15mm particle size product use a spiral classifier For classification, the returned sand is returned to the mill for regrind under the action of spraying water at the top of the spiral classifier. The overflow of the classifier is used as the final product of grinding. The overflow concentration is 45-55%, and the overflow fineness is -0.074mm. 75-85%. In the particle size composition of the grinding product: +0.147mm accounts for 0~5%, -0.147+0.074mm accounts for 2...

Embodiment 2

[0029] A comprehensive ore sample in Henan bauxite mining area 2, Al 2 O 3 53.71%, SiO 2 18.44%, the ratio of aluminum to silicon is 2.91. The principle process flow chart used is shown in Figure 2, and the raw ore particle size composition is shown in Table 3. The specific process is as follows:

[0030]The comprehensive ore sample 2 is dry sieved by a vibrating screen with an aperture of 10mm. The +10mm particle size product enters the short mill with a length-to-diameter ratio of 0.6. The mill discharge product and the -10mm particle size product use hydrocyclone. The grading underflow is returned to the first stage of grinding through a closed circuit, and the grading overflow is carried out for the second stage of classification. The concentration of the first stage is 40-55%, and the overflow fineness -0.074mm accounts for 65-75%. The second stage of grading underflow passes through the closed circuit. Return to the second stage grinding, the overflow of the second stage cla...

Embodiment 3

[0034] A comprehensive ore sample 3 in Henan bauxite mining area, Al 2 O 3 54.82%, SiO 2 17.62%, the ratio of aluminum to silicon is 3.11, the principle process flow chart used is shown in Figure 2, and the raw ore particle size composition is shown in Table 5. The specific process is as follows:

[0035] The comprehensive ore sample 2 is first washed with a cylindrical ore washing machine, and the obtained coarse or lump ore directly enters the mill. After the fine-grained product is concentrated, the overflow is returned to the ore washing operation through the pump. The underflow or sedimentation is mixed with the ore discharge product of the mill and classified together. The returned sand is returned to the first stage of grinding through a closed circuit, and the fine-grained product obtained by overflow is subjected to a second stage of classification. The overflow concentration of the first stage is 45-60%. The flow fineness -0.074mm accounts for 65 to 75%. The returned san...

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Abstract

The invention relates to a grinding method to improve aluminum ore grinding particle distribution. It screens or separates the fine aluminum ore or paste, with thick particles or block ore for grinding. Using quick grinding, forced ore extraction and highly efficient leveling technique, it reduces the regrinding for acceptable grain product, reducing pelitization or overgrinding, especially fine level content, with -200 being 85%, reducing -400 content lower than 40%, significantly improving grain distribution of the grind ore and reduced grinding energy consumption.

Description

Technical field [0001] The invention relates to a grinding method for improving the particle size distribution of bauxite grinding products, which is used in production processes containing grinding operations such as bauxite beneficiation or alumina. Background technique [0002] my country's bauxite resources are mainly monohydrate diaspore bauxite, which has the characteristics of high aluminum, high silicon, and low aluminum to silicon ratio. For diaspore-type bauxite, in recent years, the industry has mostly adopted the Bayer process with low production cost to produce alumina. However, with the rapid development of the alumina industry, there are fewer and fewer high-grade bauxite resources suitable for the production of alumina by the Bayer process. In order to economically and rationally use my country’s low- and medium-grade bauxite resources, it is improved The grade of bauxite, and then the economical Bayer process for alumina production, has significant economic and s...

Claims

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Application Information

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IPC IPC(8): B02C23/08B02C23/16B07B1/46B03B5/56B03B5/52
CPCB02C23/08B03B9/00C22B1/00C01F7/0613C22B21/0007
Inventor 陈湘清马俊伟陈占华
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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