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Method for fast sedimentation separating high solid dissolving-out mining slurry red mud

A technology of sedimentation separation and high solid content, which is applied in the direction of separation methods, sedimentation separation, chemical instruments and methods, etc., and can solve problems such as increased solid content of diluted ore pulp

Inactive Publication Date: 2008-02-13
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] In the production process, whether it is the Bayer process or the sintering process, in order to increase production capacity, the concentration of the decomposed stock solution will also be increased, which will also increase the solid content of the diluted pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Using bauxite in a certain mining area, under certain production conditions, the solid content of the Bayer method diluted pulp is 97.7g / L, and polyacrylamide flocculants are used for flocculation and sedimentation. The amount of flocculants added is 40g / t-dry red mud, The settling temperature is 100°C, the red mud settling speed is 1.6mm / min in the first 5 minutes, and 1.8mm / min in the first 10 minutes. Under the condition that the liquid phase concentration of the diluted pulp remains unchanged, the solid content of the diluted pulp is 73g / L by using the coarse liquid reflux method. Under the same settling conditions, the red mud settling speed is 11.8mm / min in the first 5 minutes. The sedimentation speed of the red mud in the first 10 minutes was 8.1mm / min (the height of the sedimentation tube was 185mm).

Embodiment 2

[0026] Using bauxite in a mining area, under certain production conditions, the solid content of the Bayer method diluted pulp is 89g / L, and polyacrylamide flocculants are used for flocculation and sedimentation. The amount of flocculants added is 40g / t-dried red mud, sediment The temperature is 102°C, the sedimentation speed of red mud is 4.7mm / min in the first 5 minutes, and 4.4mm / min in the first 10 minutes. Under the condition that the liquid phase concentration of the diluted pulp remains unchanged, the thick liquid reflux method is used to make the diluted pulp solid content to 64g / L. Under the same settling conditions, the red mud settling speed is 14.2mm / min in the first 5 minutes. The sedimentation speed of the red mud in the first 10 minutes was 9.0mm / min (the height of the sedimentation tube was 185mm).

Embodiment 3

[0028] Using bauxite in a mining area, under certain production conditions, the solid content of the Bayer method diluted pulp is 83.8g / L, and a foreign flocculant is used for flocculation and sedimentation. The temperature is 102°C, the sedimentation speed of red mud is 2.2mm / min in the first 5 minutes, and 2.3mm / min in the first 10 minutes. Under the condition that the liquid phase concentration of the diluted pulp remains unchanged, the thick liquid reflux method is used to make the diluted pulp with a solid content of 60.6g / L. Under the same settling conditions, the red mud settling speed is 11.8mm / min in the first 5 minutes , the sedimentation speed of red mud in the first 10 minutes was 8.6mm / min (the height of the sedimentation tube was 185mm).

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Abstract

A prompt sedimentation and separation method of high-solid red mud which contains digested slurry relates to the sedimentation and separation method of a diluted slurry after digestion during a course of producing alumina, including the red mud sedimentation and separation courses of the digested and diluted slurry by a bayer process and a material slurry of a clinker after digestion by a sintering process. The method is characterized in that the digested slurry is further diluted by an overflow of a separation and sedimentation groove to reduce a solid content of the slurry and quicken the red mud sedimentation and separation. The method of the present invention does not change chemical components of a slurry liquid phase during the course of the red mud sedimentation, and brings no negative effect to the whole production, which can be used in the sedimentation and separation of the digested slurry by the bayer process as well as can be used in the sedimentation and separation of the material slurry of the clinker after digestion by the sintering process.

Description

technical field [0001] A method for rapid sedimentation and separation of high-solid leached pulp red mud, which relates to a sedimentation and separation process of diluted ore pulp after leaching in the alumina production process, including the red mud leached from the Bayer process and the sintered clinker eluted slurry. Sludge settling separation process. Background technique [0002] In the alumina production process, the sedimentation and separation of red mud is a very important step. The lower the solid content of diluted pulp, the faster the sedimentation and separation speed of red mud. As the aluminum-silicon ratio of bauxite used in production continues to decrease, the solid content ratio of the diluted slurry after dissolution increases significantly when the ore with a high aluminum-silicon ratio is used. After the solid content of the diluted slurry rises after dissolution, it will cause the dissolution slurry to settle slowly, making it difficult to carry ...

Claims

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Application Information

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IPC IPC(8): B01D21/00
Inventor 尹中林范伟东赵卓
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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