Method of purifying organic substance in solution by Bayer method

A Bayer process and organic matter technology, which is applied in the field of purification of organic matter in Bayer process solution, can solve the problems of no organic matter, and the organic matter in sodium aluminate solution has not been studied in depth, and achieves the effect of reducing the content of organic matter and reducing adverse effects.

Inactive Publication Date: 2007-10-24
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The vast majority of bauxite in my country is low-to-medium-grade diaspore-type bauxite, and most of them adopt the hybrid method or sintering method to produce alumina, and there is almost no accumulation of organic matter. Therefore, in the past, sodium aluminate solution organic matter has not been studied in depth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The evaporated raw solution (seeding mother liquor) with an organic content of 2.0g / l (total organic carbon), the caustic alkali concentration after evaporation is 280g / l, after cooling down to a temperature of 100°C, add 5g / l of sodium carbonate to the solution During the time of staying in the settling tank for 30 minutes, the organic content in the solution after liquid-solid separation was 1.0g / l (converted into the concentration of the evaporated stock solution), and the organic content in the sodium aluminate solution was reduced by 50%.

Embodiment 2

[0020] The evaporated raw solution (seeding mother liquor) with an organic content of 5.0g / l (total organic carbon), the caustic alkali concentration after evaporation is 400g / l, after cooling down to a temperature of 50°C, add 50g / l of sodium carbonate to the solution During the time of staying in the settling tank for 100 minutes, the organic matter content in the solution after liquid-solid separation was 1.5g / l (converted into the concentration of the evaporated stock solution), and the organic matter content in the sodium aluminate solution was reduced by 70%.

Embodiment 3

[0022] The evaporated raw solution (seeding mother liquor) with an organic content of 1.0g / l (total organic carbon), the caustic alkali concentration after evaporation is 350g / l, after cooling down to a temperature of 80°C, add 25g / l of sodium carbonate to the solution During the time of staying in the settling tank for 60 minutes, the organic content in the solution after liquid-solid separation was 0.4g / l (converted into the concentration of the evaporated stock solution), and the organic content in the sodium aluminate solution was reduced by 60%.

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Abstract

The invention discloses a purifying method of sodium aluminate through Baeyer method, which comprises the following steps: evaporating the solution of Baeyer method to condense; adding the crystal additive of one or two composition of sodium carbonate, sodium sulfate, sodium oxalate, calciumaluminate and alumina in the sintering kiln; cooling; crystallizing; evolving organics with additive, sodium carbonate and sodium sulfate; separating the sintering material to obtain the product; combining the evaporating crystal and seed organically; reducing bad influence for organics in the manufacturing course.

Description

technical field [0001] The invention discloses a method for purifying organic matter in a Bayer process solution, relating to a method for purifying organic matter in a sodium aluminate solution, in particular to a method for purifying organic matter in a Bayer process sodium aluminate solution. Background technique [0002] In the process of producing alumina by the Bayer process, the main sources of organic matter are as follows: First, the organic matter in the form of humus brought into the bauxite itself, after the high-pressure dissolution process, the humus is gradually decomposed into low-molecular compounds, The final possible degradation products are sodium salts of low molecular weight acetic acid, oxalic acid, etc.; the second is that with the circulation of the Bayer process solution, additives such as flocculants, filter aids, and lubricating oil are gradually added in the Bayer process; The implementation of industrialization makes the beneficiation agent brou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/47
Inventor 杨巧芳赵清杰李晓萍
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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