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Crude liquid desilicon method for producing aluminium oxide

A desiliconization and crude liquor technology, which is applied in the purification of aluminate/alumina/aluminum hydroxide and the preparation of alkali metal aluminate/alumina/aluminum hydroxide, to achieve good economic and social benefits and reduce energy consumption. The effect of reducing energy consumption and waste discharge

Inactive Publication Date: 2006-01-11
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method of using the by-products of gallium recovery as a desilicon additive to desiliconize the crude liquid of the sintering process under atmospheric pressure, aiming at the problem of desiliconization of the crude liquid of the sintering method and the comprehensive utilization of the by-products recovered by the lime method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In the sintering method system for the production of alumina by the mixed method, add 20g / l Bayer process red mud to the sintering method crude liquid with an alumina concentration of 100g / l, react at a temperature of 90°C for 3 hours, and then add the following Calcium oxide is 30g / l after 0.5 hours of grinding (81% particle size is less than 20 μm) of the dealuminated slag, and the reaction is continued for 2 hours at the same temperature. After liquid-solid separation, the silicon content index of the semen is 470.

Embodiment 2

[0035] In the sintering method system for the production of alumina by the mixed method, add 50g / l Bayer process red mud to the sintering method crude liquid with an alumina concentration of 170g / l, react at a temperature of 100°C for 2 hours, and then add the following Calcium oxide counted as 20g / l dealuminated slag after 2 hours of grinding (87% particle size is below 20 μm), continued reaction at the same temperature for 1 hour, after liquid-solid separation, the silicon content index of the semen was 375.

Embodiment 3

[0037] In the sintering method system for the production of alumina by the mixed method, 80g / l Bayer process red mud is added to the sintering method crude liquid with an alumina concentration of 180g / l, reacted at a temperature of 105°C for 3 hours, and then added Calcium oxide is 10g / l after 4 hours of grinding treatment (90% of the particle size is below 20 μm) of the dealuminated slag, and the reaction is continued for 1 hour at the same temperature. After the liquid-solid separation, the silicon content index of the semen is 380.

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Abstract

A process for desiliconizing the coarse liquid generated during preparing alumina features that the dealuminated dregs as the by-product of recovering Ga is used as the desiliconizing additive, and includes such steps as adding Baeyer-method red mud, desiliconizing reaction, adding the said desiliconizing additive whose surface has been activated, further reaction for 1-3 hr, and solid-liquid separation. Its advantage is high efficiency.

Description

technical field [0001] The invention relates to a crude liquid desiliconization method for producing alumina, and relates to a method for desiliconizing crude liquid at normal pressure by a sintering method in the process of producing alumina by a hybrid method. Background technique [0002] At present, in the sintering system of the mixed production of alumina, the β-2CaO·SiO in the clinker 2 It reacts with the alkali in the solution during the stripping process, so that part of the silica enters the sodium aluminate solution. These silicas are unstable, and they will enter the product along with the decomposition of aluminum hydroxide to increase the impurity content of the product. Therefore, the alumina factory needs to set up a special desiliconization process to reduce the concentration of silica in the solution. The higher the silicon content index of the semen, the higher the purity of the product alumina at the same decomposition rate, and the quality of the carbon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/04C01F7/46
Inventor 赵清杰杨巧芳白万全李晓萍
Owner GUIZHOU BRANCH CHINA ALUMINUM IND