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Method for reclaiming and reusing aluminum hydroxide scab

A technology of aluminum hydroxide and alumina, which is applied in the preparation of alumina/hydroxide, etc., can solve the problems such as the increase of repeated processing costs, and achieve the effect of reducing production costs.

Active Publication Date: 2008-04-23
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to recycle, these scabs and waste materials are usually used as raw materials and returned to the mine tank for batching, and then produce alumina through slurry preparation, sintering, dissolution desiliconization, decomposition and other processes, resulting in increased repeated processing costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The aluminum hydroxide decomposition tank obtained through cleaning is scabbed into lumps, which are ground before dissolution and passed through a sieve with a pore size of 1.1 mm. N for undersize T Dissolve the liquid caustic soda with a concentration of 320g / l, pass steam to maintain the temperature at 95°C for 60 minutes, the dissolution rate is 93%, and the solid content of the slurry after dissolution is 10g / l, which can be directly sent to the subsequent desiliconization process.

Embodiment 2

[0012] Aluminum hydroxide waste obtained by white mud wash float, in powder form, with N T The concentration of 210g / l seed fraction evaporated mother liquor is dissolved, the temperature is kept at 95°C by passing steam for 60 minutes, the dissolution rate is 92%, and the solid content of the slurry after dissolution is 9g / l, which can be directly sent to the subsequent desilication process.

Embodiment 3

[0014] Aluminum hydroxide waste obtained by white mud wash float, in powder form, with 80% by weight of N T Concentration of 205g / l seed evaporation mother liquor and 20% by weight of N T The liquid-alkali mixture with a concentration of 315g / l is dissolved, and the temperature is kept at 93°C by passing steam for 55 minutes. The dissolution rate is 90%, and the solid content of the slurry after dissolution is 11g / l, which can be directly sent to the subsequent desilication process.

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PUM

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Abstract

This invention relates to a method for recovering the slag of aluminium hydroxide. The procedures are: the slag is added into the mother liquor and / or alkaline liquor of the sintering process for producing aluminium oxide, controlling its solid content by 100-260g / l, feeding-in the steam for heating at 90-100deg.C for 50-70 min to dissolving the slag. After that, the solution is direct added into the latter half process i.e. the silicon-removing process and decomposition process. Due to the addition of the slag of aluminium hydroxide direct to the latter half process, not the full process, so it saves processing cost obviously.

Description

technical field [0001] The invention relates to a method for recycling aluminum hydroxide scabs, and belongs to the technical field of alumina production. Background technique [0002] In the production of sintered alumina, due to the influence of the nature of the material itself and the process conditions in the production process, some aluminum hydroxide scabs and aluminum hydroxide waste with high alumina content will be produced in the production process and the material transportation and storage process . These scabs and wastes are basically produced in the post-production process of alumina, such as scabs, wastes and floats in the decomposition tank of the decomposition process, and the materials contain some impurities. In order to recycle, these scabs and waste materials are usually used as raw materials and returned to the mine tank for batching, and then produce alumina through slurry preparation, sintering, dissolution desiliconization, decomposition and other ...

Claims

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Application Information

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IPC IPC(8): C01F7/30
Inventor 霍登伟任明林张哲新张瑞锋范文峰王庆娜
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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