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Method of separating NaOH in sodium aluminate solution in aluminum oxide producing process

A technology for producing sodium aluminate and alumina, which is applied in the purification of aluminate/alumina/aluminum hydroxide, the preparation of alkali metal aluminate/alumina/aluminum hydroxide, chemical instruments and methods, etc. Evaporated mother liquor caustic ratio, large amount of extractant oil, etc., to achieve the effect of easy continuous operation, small footprint and fast speed

Inactive Publication Date: 2007-03-07
GUIZHOU BRANCH CHINA ALUMINUM IND
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for extracting and separating NaOH from Bayer process alumina to produce sodium aluminate solution, the equilibrium concentration of sodium hydroxide in the oil phase is relatively low, and the amount of extractant used is large. The oil phase is separated from the sodium aluminate solution in the alumina production process through multiple cycles to separate part of the free sodium hydroxide, which can reduce the caustic ratio of the evaporation mother liquor to the purpose of re-decomposing and separating the remaining alumina in the evaporation mother liquor. Method for separating NaOH from alumina production sodium aluminate solution to improve alumina production efficiency

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  • Method of separating NaOH in sodium aluminate solution in aluminum oxide producing process

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Embodiment 1

[0026] Raw materials: Sodium aluminate solution comes from an alumina plant, the chemical composition is N K 320g / L, Al 2 o 3 178.4g / L, caustic ratio 2.95; stripping solution—chemical composition of decomposition mother liquor is N K 165g / L, Al 2 o 3 93.6g / L, caustic ratio 2.90, extractant is C 8 ~C 10 of fatty alcohols.

[0027] 38-stage extraction, extraction temperature 90°C; 10-stage back-extraction, back-extraction temperature 90°C; extraction ratio 1:1, back-extraction ratio 2:1; distillation temperature 110°C. After extraction with sodium aluminate solution, N K is 370g / L, and the caustic ratio is 1.59; the N K It is 247g / L, and the caustic ratio is 3.4.

Embodiment 2

[0029] Raw material is with embodiment 1.

[0030] 40-stage extraction, extraction temperature 86°C; 18-stage back-extraction, back-extraction temperature 86°C; extraction ratio 1:1, back-extraction ratio 1:1; distillation temperature 125°C. After extraction with sodium aluminate solution, N K is 376g / L, and the caustic ratio is 1.55; the N K It is 226g / L, and the caustic ratio is 3.18.

Embodiment 3

[0032] Raw material is with embodiment 1.

[0033] 45-stage extraction, extraction temperature 92°C; 7-stage back-extraction, back-extraction temperature 92°C; extraction ratio 1:1, back-extraction ratio 2.5:1; distillation temperature 140°C. After extraction with sodium aluminate solution, N K is 386g / L, and the caustic ratio is 1.50; the N K It is 250g / L, and the caustic ratio is 3.47.

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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: extracting discontinuously; proceeding back extraction; distilling; extracting. The extracting groove and clearing groove constitute a unit and back extracting groove and back clearing groove constitute a unit.

Description

technical field [0001] A method for separating NaOH from sodium aluminate solution produced by alumina, involving a method of using fatty alcohol as an extraction agent, using intermittent extraction and separation technology, and separating free hydrogen from sodium aluminate solution during the decomposition process of alumina production Sodium oxide separation method. Background technique [0002] The Bayer process is the main method of producing alumina in the world. The production of alumina by the Bayer process mainly includes two processes: decomposition and dissolution. During the decomposition process, due to the balanced characteristics of the decomposition reaction of the sodium aluminate solution, the decomposition of the sodium aluminate crystal seeds is incomplete, and there is still a large amount of sodium aluminate in the circulating fluid, and the decomposition rate can only reach about 50%. The yield is also lower. This is the most important problem in ...

Claims

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Application Information

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IPC IPC(8): C01D1/28C01F7/47
Inventor 顾松青尹中林韩东战白万全齐利娟
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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