Method of dissolving high grade gibbsite type bauxite by bayer process

A technology of gibbsite type and Bayer method, which is applied in the purification of alumina/aluminum hydroxide, aluminate/aluminum oxide/aluminum hydroxide, etc., can solve the problem of low silicon content index in the eluting solution, inability to achieve the decomposition process, Can respond to problems such as low silicon content

Inactive Publication Date: 2007-03-07
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Application Information

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Problems solved by technology

[0002] In the process of processing high-grade gibbsite-type bauxite to produce alumina by Bayer process, because the content of reactive silicon in high-grade bauxite is low, under the usual dissolution process conditions, the silicon content index of the dissolution solution Low, can not meet the requirements of the decomposition process, so it is necessary to use a certain process to improve the silicon content index of the eluate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Using gibbsite-type bauxite in a mining area, under the conditions that the dissolution temperature is 145°C, the lye Nk for dissolution is 180g / L, the amount of lime added is 2%, and the dissolution time is 60 minutes, the pre-desilication solid content 250g / L, the pre-desiliconization temperature is 95°C, the pre-desilication is dissolved after 5 hours, and the silicon content index of the eluate is 147.22; other conditions remain unchanged, when the pre-desilication solid content is increased to 1000g / L, the eluate The silicon content index can reach 176.15; when the pre-desilication solid content is increased to 1200g / L, the silicon content index of the eluate can reach 185.22.

Embodiment 2

[0022] Using gibbsite-type bauxite in a mining area, under the conditions that the dissolution temperature is 145°C, the lye Nk for dissolution is 162g / L, the amount of lime added is 0%, and the dissolution time is 30 minutes, the pre-desilication solid content When the pre-desiliconization temperature is 100°C, the pre-desilication temperature is 100°C, and the silicon content index of the eluate is 170.02 after 8 hours of pre-desilication; other conditions remain unchanged, and when the pre-desilication solid content is increased to 1000g / L, the eluate The silicon content index of the solution can reach 191.04; when the pre-desilication solid content is increased to 1500g / L, the silicon content index of the eluate can reach 200.22.

Embodiment 3

[0024] Using gibbsite-type bauxite in a mining area, under the conditions that the dissolution temperature is 180°C, the lye Nk for dissolution is 162g / L, the amount of lime added is 2%, and the dissolution time is 60 minutes, the pre-desilication solid content When the pre-desilication temperature is 107°C, the pre-desilication temperature is 107°C, and the silicon content index of the eluate is 183.56 after 12 hours of pre-desilication; other conditions remain unchanged, and when the pre-desilication solid content is increased to 1200g / L, the eluate The silicon volume index can reach 220.63.

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Abstract

The invention discloses a high-grade aluminum trihydrate bauxite stripping method through Baeyer method, which is characterized by the following: increasing the content of pre-stripped silicon pulp; adding circulated mother liquid after normal silicon pre-stripping reaction; adjusting pulp to normal content; stripping in the flux course.

Description

technical field [0001] The invention discloses a Bayer process dissolution method for high-grade gibbsite-type bauxite, and relates to a Bayer process dissolution method in the process of producing alumina from high-grade gibbsite-type bauxite. Background technique [0002] In the process of processing high-grade gibbsite-type bauxite to produce alumina by Bayer process, because the content of reactive silicon in high-grade bauxite is low, under the usual dissolution process conditions, the silicon content index of the dissolution solution Low, can not meet the requirements of the decomposition process, so it is necessary to adopt a certain process to improve the silicon content index of the eluate. [0003] The current Bayer dissolution process for processing gibbsite-type bauxite is usually a double-flow method, or a higher dissolution temperature is used to ensure the desilication effect of the dissolution process. [0004] The double-flow dissolution process is to divid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/46
Inventor 李旺兴尹中林李新华范伟东武国宝刘汝兴
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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