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Batching method for treating middle-low grade alumyte by bayer process

A low-grade bauxite and Bayer process technology, applied in the direction of alumina/hydroxide, etc., to achieve sustainable development, prolong mine service life, and avoid the loss of mineral resources

Inactive Publication Date: 2008-04-09
GUIZHOU BRANCH CHINA ALUMINUM IND
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Problems solved by technology

There is no precedent for using low-to-medium-grade bauxite with an aluminum-silicon ratio of less than 7 directly in the Bayer process

Method used

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  • Batching method for treating middle-low grade alumyte by bayer process

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Embodiment Construction

[0012] The present invention will be further described below by way of examples.

[0013] The measured bauxite grades of the concentrate heap of Pingguo Bauxite Mine on August 30, 2007 are shown in Table 1 below.

[0014] Concentrate pile number

Measured aluminum-silicon ratio

Remark

1

4.53

low grade ore

2

16.78

high grade ore

[0015] In the above table, A 1 =4.53,A 2 =16.78.

[0016] At that time, the Bayer method production process of the alumina factory required the target aluminum-silicon ratio of ore blending to be A=12.

[0017] The ratio of low-grade ore to high-grade ore is:

[0018] P=(A 2 -A) / (A-A 1 )=(16.78-12):(12-4.53)=6.78:8.53=1:1.26

[0019] According to the ratio of 1:1.26, the ore blending of low-grade and high-grade bauxite is carried out, and then homogenized and sent to the alumina plant for production, that is, the target aluminum-silicon ratio required for the production proce...

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Abstract

The invention provides an ore matching method of low grade bauxite in Bayer treatment. After aluminum-silicon ratio measurement of high and low grade bauxite, matching calculation is performed according to the target value of ore matching to obtain the matching ratio of the high and the low grade bauxite for the ore matching production. Through rational ore matching, the invention enables that the medium and low grade bauxite with the aluminum-silicon ratio lower than seven can also apply to the Bayer production process. The invention, if implemented, can economically and effectively process medium and low grade bauxite with Bayer production technology, thereby thoroughly utilizing low grade mineral resources, avoiding the mineral resource loss to the maximum, lengthening the service life of mineral mountains and having tremendous significance to the sustainable development of enterprises.

Description

technical field [0001] The invention relates to a method for processing low- and medium-grade bauxite in alumina production, in particular to an ore blending method for processing low- and medium-grade bauxite by Bayer process. Background technique [0002] The main processes of alumina production are Bayer method, sintering method, Bayer-sintering combined method (combined method), ore dressing-Bayer method. The production process mainly depends on the properties of bauxite. Ratio has a lot to do with it. Medium and low-grade bauxite refers to bauxite ore with an aluminum-silicon ratio of less than 7. At present, domestic production of alumina with low-to-medium-grade bauxite with an aluminum-silicon ratio of less than 7 generally adopts sintering, Bayer-sintering Combined method (combined method) or beneficiation-Bayer method, while the production of alumina by pure Bayer method requires the ratio of aluminum to silicon in the ore to be above 7. There is no precedent for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 程运材廖江南杨海洋吴秀琼何蔚肖跃民黄华勇韦立凡蔡若斌王太海黎乾汉陈建双
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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