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Method for treating mother liquor floating material during production of aluminum oxide

A production process and technology for suspended matter, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problem that the caustic ratio of the existing dissolution solution cannot be reduced, the total recovery rate of alumina cannot be improved, and the system cannot be improved. cycle efficiency and other issues, to achieve the effect of improving cycle efficiency, efficient recovery, and overcoming production and cycle efficiency

Active Publication Date: 2009-12-23
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method proposed in this patent can recover aluminum hydroxide as a soluble mineral, but it only enters the raw material of the Bayer method and the high-temperature dissolution process as a soluble mineral, which cannot reduce the caustic ratio of the existing dissolution liquid and does not improve the total recovery of alumina. rate, so that the system cycle efficiency cannot be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the amount of aluminum hydroxide floating matter in the production process, use the decomposed mother liquor or the washing liquid of the alumina production system to prepare a slurry with a solid content of 500-1000g / L, and calculate the flow rate; then design and manufacture a mixing tank, preheat Pipeline length and series, related equipment, etc., connect the float preheating pipeline and other related equipment with a set of Bayer method self-evaporation system.

[0021] The prepared floating substance slurry is pumped into the 2nd to 3rd stage pipeline preheater, and the secondary steam from the corresponding self-evaporator is used to preheat the floating substance slurry to 105~150°C, and then enters the 8th~10th stage. The stage is from the evaporator, together with the original diaspore dissolution slurry, it is dissolved and flashed at the same time. The caustic ratio of the seminal fluid after ungrading from the evaporator is diluted and desilic...

Embodiment 2

[0023] According to the amount of aluminum hydroxide floating matter in the production process, use the decomposed mother liquor or the washing liquid of the alumina production system to prepare a slurry with a solid content of 500-1000g / L, and calculate the flow rate; then design and manufacture pipelines and related equipment, and Connect with a set of dilution systems.

[0024] The prepared floating substance slurry is pumped into the post-dissolution tank together with the original diaspore dissolution slurry, and enters the dilution tank after dissolution. The caustic ratio of semen after dilution and desiliconization is reduced by 1% to 8%.

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Abstract

The invention discloses a method for treating the floating matter in the mother liquor of the alumina production process, and relates to a method for treating the mother liquor of the alumina production method. It is characterized in that the treatment process is that the sodium aluminate semen is subjected to seed separation or carbon separation to obtain the mother liquor, and then the aluminum hydroxide floating matter recovered by filtration is prepared into a slurry, and then enters the Bayer method self-evaporation system or dilution system for dissolution. The method of the present invention avoids the problem that the floating matter enters the carbon separation process directly as a product or as a crystal seed and the product quality is poor, and also overcomes the problem that the floating matter enters the Bayer method batching and stripping system and cannot improve production and cycle efficiency. The caustic ratio of semen in the Bayer method series is reduced by 1% to 8%, and the cycle efficiency is increased by 1.5% to 17%.

Description

technical field [0001] The invention discloses a method for treating the float in mother liquor in the alumina production process, and relates to a method for treating the mother liquor in the alumina production. Background technique [0002] In the production of alumina by the alkaline method, a certain amount of floating matter is still suspended in the mother liquor after solid-liquid separation after the decomposition of the sodium aluminate solution, and its main component is aluminum hydroxide with fine particles. At present, in the production process, the content of suspended solids in the mother liquid of seed fraction sometimes reaches as high as 8.2g / L, and the content of suspended solids in the mother liquid of carbon fraction reaches as high as 4.97g / L. These floats circulate in the process, which increases the power costs, maintenance costs and spare parts costs of various equipment. If the floats enter the evaporation system with the mother liquor without treat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14
Inventor 白万全李晓萍杨巧芳
Owner GUIZHOU BRANCH CHINA ALUMINUM IND