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Method of extracting, distilling and separating sodium hydroxide in sodium aluminate solution in aluminum oxide producing process

A technology of extractive distillation and sodium hydroxide, applied in the purification of aluminate/alumina/aluminum hydroxide, preparation of alkali metal aluminate/alumina/aluminum hydroxide, alkali metal oxide/hydroxide, etc., It can solve the problems such as the extraction and distillation separation of sodium hydroxide, etc.

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

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Problems solved by technology

However, in the relevant literature and patents, there is no report on the discussion of sodium hydroxide in the Bayer evaporation mother liquor by extraction and distillation separation.

Method used

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  • Method of extracting, distilling and separating sodium hydroxide in sodium aluminate solution in aluminum oxide producing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Raw material: mother liquor evaporated by Bayer method, chemical composition is N K 320g / L, Al 2 o 3 178.4g / L, caustic ratio 2.95; stripping solution is decomposition mother liquor, its chemical composition is N K 165g / L, Al 2 o 3 93.6g / L, caustic ratio 2.90.

[0026] Use n-octanol to extract and evaporate the mother liquor, 45 stages of extraction, the extraction temperature is 90°C, and the reaction time of each stage is 2 minutes; 6 stages of stripping, the stripping temperature is 90°C, and the reaction time of each stage is 2 minutes; The extraction ratio is 2:1; the distillation temperature is 99°C. After evaporating the mother liquor and extracting N K is 370g / L, and the caustic ratio is 1.59; the N K It is 247 and the caustic ratio is 3.4.

Embodiment 2

[0028] Raw material: mother liquor evaporated by Bayer method, chemical composition is N K 320g / L, Al 2 o 3 178.4g / L, caustic ratio 2.95; stripping solution is decomposition mother liquor, its chemical composition is N K 165g / L, Al 2 o 3 93.6g / L, caustic ratio 2.90.

[0029] Use n-octanol to extract and evaporate the mother liquor, 50 stages of extraction, the extraction temperature is 75 ° C, and the reaction time of each stage is 8 minutes; 8 stages of stripping, the stripping temperature is 70 ° C, and the reaction time of each stage is 12 minutes; The extraction ratio is 4:1; the distillation temperature is 87°C. After evaporating the mother liquor and extracting N K is 372g / L, and the caustic ratio is 1.53; the N K It is 243 and the caustic ratio is 3.54.

Embodiment 3

[0031] Raw material: mother liquor evaporated by Bayer method, chemical composition is N K 320g / L, Al 2 o 3 178.4g / L, caustic ratio 2.95; stripping solution is decomposition mother liquor, its chemical composition is N K 165g / L, Al 2 o 3 93.6g / L, caustic ratio 2.90.

[0032] Use n-octanol to extract and evaporate the mother liquor, 20 stages of extraction, extraction temperature 95°C, reaction time of each stage is 2 minutes; 12 stages of stripping, stripping temperature of 90°C, reaction time of each stage is 4 minutes; The extraction ratio is 5:1; the distillation temperature is 99.7°C. After evaporating the mother liquor and extracting N K is 387g / L, and the caustic ratio is 1.46; the N K is 250, and the caustic ratio is 3.45.

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Abstract

The invention discloses a NaOH separating method from sodium aluminate solution through alumina based on aliphatic alcohol as extractant, which comprises the following steps: returning extracted liquid in the alumina manufacturing system; resolving seed; adopting resolving mother liquid or wash solution of aluminum hydroxide or water back extraction as extracting phase; returning water phase solution after back extraction in the alumina manufacturing system; distilling oil phase for extracting; circulating oil phase continuously.

Description

technical field [0001] The sodium hydroxide method for extraction and distillation of sodium aluminate solution in alumina production involves a method of using fatty alcohol as an extraction agent and adopting extraction and distillation techniques to separate sodium aluminate solution (such as evaporation mother liquor) in alumina production process Sodium hydroxide, thereby reducing the caustic ratio of sodium aluminate solution, continues to be used for the method of seed crystal decomposition. Background technique [0002] The production of alumina by Bayer process has a history of more than 100 years, and it is still the main method of producing alumina. The Bayer process mainly includes two main processes, that is, the seed crystal decomposition process of low caustic ratio sodium aluminate solution and the process of decomposing mother liquor to dissolve bauxite. The two processes are used alternately to process bauxite, and aluminum hydroxide products are obtained f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D1/28C01F7/47
Inventor 顾松青尹中林白万全韩东战齐利娟
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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