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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: 2009-04-15
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 particles, which affect the selection index and follow-up process. A grinding method that can significantly improve the particle size distribution of bauxite grinding products, effectively improve process indicators, reduce production costs and energy consumption

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
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Effect test

Embodiment 1

[0023] A comprehensive ore sample 1 in Henan bauxite mining area, raw ore Al 2 o 3 56.79%, SiO 2 14.90%, the ratio of aluminum to silicon is 3.81, the principle process flow chart adopted is shown in figure 1 , the raw ore particle size composition is shown in Table 1, and its specific process is as follows:

[0024] The comprehensive ore sample 1 is dry-screened with a vibrating screen with an aperture of 15mm, and the +15mm particle size product enters a short mill with a length-to-diameter ratio of 0.8, and the mill discharge product and -15mm particle size product use a spiral classifier Classification is carried out, and the returned sand returns to the mill for regrinding 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 acc...

Embodiment 2

[0030] A comprehensive ore sample 2 in Henan bauxite mining area, Al 2 o 3 53.71%, SiO 2 18.44%, the ratio of aluminum to silicon is 2.91, the principle process flow chart adopted is shown in figure 2 , the raw ore particle size composition is shown in Table 3, and its specific process is as follows:

[0031]The comprehensive ore sample 2 is dry-screened with a vibrating screen with an aperture of 10mm, and the +10mm particle size product enters a short mill with an aspect ratio of 0.6, and the mill discharge product and -10mm particle size product are hydrocyclone The graded underflow returns to the first stage of grinding through the closed circuit, and the graded overflow is classified in the second stage. The concentration of the first stage overflow is 40-55%, and the overflow fineness -0.074mm accounts for 65-75%. The second stage of the classified underflow passes through the closed circuit. Return to the second stage grinding, the overflow of the second stage cla...

Embodiment 3

[0037] 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 adopted is shown in figure 2 , the raw ore particle size composition is shown in Table 5, and its specific process is as follows:

[0038] The comprehensive ore sample 2 is firstly 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 returns to the ore washing operation through the pump. The underflow or grit is mixed with the ore discharge product of the mill and classified together. The returned sand returns to the first stage of grinding through a closed circuit. The fine-grained products obtained by the overflow are classified in the second stage. Flow fineness -0.074mm accounts for 65-75%. The returned sand returns to the second-stage grinding through a closed circuit, and the overf...

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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 bauxite beneficiation or alumina and other production processes containing grinding operations. Background technique [0002] my country's bauxite resources are mainly diaspore bauxite, which has the characteristics of high aluminum, high silicon, and medium-low aluminum-silicon ratio. For diaspore-type bauxite, in recent years, the Bayer process with low production cost has been widely used in the industry 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. The grade of bauxite, and then adopt the economical Bayer process to produce alumina, which has great economic and social benefits for the sustainable development of my country's aluminum industry. [0003] Whether it is b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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