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Red mud separation and settlement method in alumina production

A kind of alumina and red mud technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of reduced washing water volume and difficult optimization of red mud damage indicators, so as to reduce damage, improve the decomposition rate of species, and increase Effect of new water volume

Inactive Publication Date: 2015-12-16
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After the flocculant preparation solution containing a certain concentration of caustic alkali enters the red mud settlement system, on the one hand, the caustic alkali brought in will bring adverse effects on red mud settlement and seed decomposition; The washing water volume of the system is passively reduced, and the red mud attachment damage index is difficult to be optimized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] With a temperature of 30°C, Na 2 Ok concentration is 10g / l Bayer method red mud washing solution, a milky flocculant is prepared to a concentration of 2‰ (volume ratio), added to the Bayer method diluted slurry for separation and sedimentation, the 5-minute sedimentation speed of red mud is 1.64m / h, crude liquid floats 0.38g / l, which can meet the production requirements.

Embodiment 2

[0015] With a temperature of 30°C, Na 2 Ok concentration is 50g / l Bayer method red mud washing solution, a milky flocculant is prepared to a concentration of 2‰ (volume ratio), added to the Bayer method diluted slurry for separation and sedimentation, the 5-minute sedimentation speed of red mud is 1.52m / h, coarse liquid floats 0.43g / l, which can meet production requirements.

Embodiment 3

[0017] With a temperature of 80°C, Na 2 Ok concentration is 15g / l Bayer method red mud washing liquid, a milky flocculant is prepared to a concentration of 2‰ (volume ratio), added to the Bayer method diluted slurry for separation and sedimentation, the 5-minute sedimentation speed of red mud is 1.48m / h, coarse liquid floats 0.41g / l, which can meet production requirements.

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PUM

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Abstract

The invention relates to an improved red mud separation and settlement method in alumina production. The method is characterized in that a flocculating agent is prepared by using a red mud washing solution in the red mud separating and washing process in Bayer process alumina production. The alkali source of a solution of the flocculating agent is optimized in the invention, so the preparation flow of the flocculating agent is simplified, caustic alkali required by preparation of the flocculating agent is omitted, and the water consumption for red mud washing is increased, thereby loss with red mud discharge is reduced, increase of the seed precipitation decomposition rate is facilitated, and the alumina production cost is effectively reduced.

Description

technical field [0001] The invention relates to an improvement of a red mud separation and sedimentation method in alumina production. Background technique [0002] With the rapid development of my country's alumina industry, bauxite resources are becoming less and less, and the grade is declining. The benefits of alumina enterprises are declining, the production technical indicators are getting worse, and the cost is rising, which seriously restricts the development of enterprises. Optimizing the production process, improving process indicators, increasing production efficiency, and reducing production consumption have become important ways to improve the competitiveness of enterprises. [0003] Adding flocculants during red mud settlement is an effective method commonly used in the alumina industry to accelerate red mud settlement. Artificially synthesized polymer flocculants such as sodium polyacrylate, polyacrylamide, etc. are widely used in the production of alumina....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 郝向东赵培生张爱贤李文化郭晋梅
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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