Alkali replenishing method during alumina production

A production process, alumina technology, applied in the preparation of alumina/aluminum hydroxide, alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problem of inability to deal with alkali powder agglomeration, high labor intensity, affecting production and other problems, to achieve the effect of reducing the flying loss of alkali powder, optimizing the environment and saving human resources

Inactive Publication Date: 2003-01-08
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of adding alkali requires large equipment investment, high labor intensity, low output, and cannot deal with the agglomeration of alkali powder
Limited by the above disadvantages, which often affect the production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A method for supplementing alkali in the alumina production process. The alkali liquor with an alkali content of 130g / l used in the preparation of raw slurry in conventional alumina production is introduced into a stirring container, and alkali powder is added to it and stirred to dissolve to a high degree. The lye with alkaline content, its Na 2 The concentration of O is 162.5g / l, and then it is sent into the lye storage tank with a slurry delivery pump to prepare raw slurry, and alkali is added to the conventional alumina production process along with the raw slurry, and the alkali content of the lye in the raw slurry is 136.9g / l.

Embodiment 2

[0015] The lye containing alkali concentration is 169g / l to introduce in a stirring container, and alkali powder is added therein and stirred and melted to obtain the lye with high alkali content, its Na 2 The concentration of O is 188.5g / l, and then it is sent into the lye storage tank with a slurry pump to prepare raw slurry, and the alkali is added to the conventional alumina production process along with the raw slurry, and the Na content of the raw slurry is 2 The concentration of O was 156.5 g / l.

Embodiment 3

[0017] The lye containing alkali concentration is 182g / l to introduce in a stirring container, and alkali powder is added therein and stirred and melted to obtain the lye with high alkali content, its Na 2 The concentration of O is 201.5g / l, and then it is sent into the lye storage tank with a slurry delivery pump to prepare raw slurry, and alkali is added to the conventional alumina production process along with the raw slurry, and the Na content of the raw slurry is 2 The concentration of O was 166.26 g / l.

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PUM

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Abstract

The present invention relates to a method for supplementing alkali in the course of alumina production by adopting pure sintering process, parallel process, series connection process and mixed connection process, and said method includes: dissolving alkali powder Na2CO3 to obtain high-content alkali liquor whose Na2O concentration is 123.5 g / l-247.1 g / l, then using alkali liquor transfer pump to feed said alkali liquor into the alkali liquor storage tank to prepare raw stock slurry whose Na2O concentration is 127.14g / l-195.6g / l, then adding the alkali into conventional alumina production process with raw stock slurry. Said ivnention can be substituted for traditional dry alkali-supplementing method, not only reduce production cost, but also raise production efficiency.

Description

(1) Technical field [0001] The invention relates to a method for supplementing alkali in the production process of alumina, which relates to a process for supplementing alkali in the pure sintering method, the parallel method, the mixed method and the series method of alumina production. (2) Background technology [0002] At present, the alkali supplementation process in the alumina production process is usually to use a double chamber pump to transport the alkali powder to the alkali powder bin of the grinding head through a pipeline by means of compressed air, and then add the alkali powder to the mill through a disc feed machine and a screw conveyor. In the grinding head chamber, a filter cloth bag is added to separate the air. This method of adding alkali requires large equipment investment, high labor intensity, low output, and cannot handle the agglomeration of alkali powder. Limited by the above shortcomings, it often affects production. (3) Contents of the inventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/06
Inventor 黄方松吴金湘丁安平许保玲郝向东薛文忠程勇
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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