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Method of treating red mud by extracting Bayer method mother liquid

A Bayer process red mud and Bayer process technology, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. The effect of reducing environmental hazards, improving dissolution efficiency and solution yield

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

AI Technical Summary

Problems solved by technology

The process is complicated, and the steam consumption is large during the evaporation process

Method used

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  • Method of treating red mud by extracting Bayer method mother liquid

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] Extraction and stripping. Use fatty alcohol with a carbon chain length of 8-10 as the extraction agent to extract the concentration N K Be the evaporated mother liquor of 320g / L, back-extract with water, extraction temperature is 90 ℃, back-extraction temperature is 85 ℃; Extraction ratio (oil: water volume ratio) is 1: 1, back-extraction ratio (oil: water) is 2:1; the number of extraction stages is 40, and the reaction time of each stage is 3 minutes; the number of stripping stages is 7 stages, and the reaction time of each stage is 5 minutes. Stripping liquid N after stripping K 240g / L, caustic ratio α K It is 43 (the small part of aluminum contained is caused by incomplete extraction and separation).

Embodiment 2

[0025] Extraction and stripping. Use fatty alcohol with a carbon chain length of 8-10 as the extraction agent to extract the concentration N K Be the evaporated mother liquor of 320g / L, back-extract with water, extraction temperature is 85 ℃, back-extraction temperature is 80 ℃; Extraction ratio (oil: water volume ratio) is 1: 1, back-extraction ratio (oil: water) is 3:1; the number of extraction stages is 35, the reaction time of each stage is 5 minutes, the number of stripping stages is 6 stages, and the reaction time of each stage is 10 minutes. Stripping liquid N after stripping K 255g / L, caustic ratio α K It is 44.2 (the small amount of aluminum contained is caused by incomplete extraction and separation).

Embodiment 3

[0027] Extraction and stripping. Use n-octanol as extractant to extract concentration N K Be the evaporated mother liquor of 320g / L, back-extract with water, extraction temperature is 75 ℃, back-extraction temperature is 70 ℃; Extraction ratio (oil: water volume ratio) is 2.5: 1, back-extraction ratio (oil: water) is 3:1; the number of extraction stages is 20, and the reaction time of each stage is 12 minutes; the number of stripping stages is 8, and the reaction time of each stage is 12 minutes. Stripping liquid N after stripping K 244g / L, caustic ratio α K It is 41.3 (the small amount of aluminum contained is caused by incomplete extraction and separation).

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Abstract

The invention discloses a red mud disposal method through mother liquid of through Baeyer extracting method, which is characterized by the following: separating sodium hydroxide from Baeyer mother liquid (decomposed mother liquid, circulating mother liquid or evaporating mother liquid); making extracting phase reextract to obtain sodium hydroxide without aluminium through water; allocating lime to strip Baeyer red mud through adding the sodium hydroxide solution; draining the slag; returning the stripped liquid for Baeyer ore.

Description

technical field [0001] A method for extracting Bayer method mother liquor to treat red mud, involving a method of extracting Bayer method mother liquor (including evaporating mother liquor) with fatty alcohol or alkylphenol as an extractant, and obtaining hydrogen almost free of sodium aluminate after back-extracting with pure water A sodium oxide solution is used to treat the Bayer process red mud to recover aluminum oxide and sodium oxide therein, and the solution after processing the Bayer process red mud is used for the dissolution process batching method in the Bayer process process. Background technique [0002] At present, all over the world, basic industries are facing global energy shortages, and resources are becoming increasingly impoverished and scarce, and environmental protection has attracted more and more attention. As far as the alumina industry is concerned, these challenges are all the more acute and cannot be ignored. [0003] Among the proven bauxite re...

Claims

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Application Information

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IPC IPC(8): C02F11/00C01D1/28
Inventor 顾松青尹中林白万全齐利娟韩东战
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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