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Separating and washing method of red mud by Bayer process

A technology of Bayer method red mud and washing method, which is applied in the field of process improvement, can solve problems such as difficulty in separation of red mud, limit the improvement of production efficiency, etc., and achieve the effect of ensuring production and increasing concentration

Inactive Publication Date: 2009-11-04
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the above technology uses settling tanks to separate red mud, when the concentration of sodium aluminate solution is further increased, it is difficult to separate red mud, which limits the improvement of production efficiency

Method used

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  • Separating and washing method of red mud by Bayer process

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Comparison scheme
Effect test

Embodiment 1

[0016] The diluted slurry has a solid content of 10g / l, caustic Na 2 o K The concentration is 140g / l, pump the diluted slurry into the cyclone group, the solid content of the underflow is 90g / l, and the solid content of the overflow is 5g / l. The underflow of the cyclone enters the rubber belt filter for filtration and washing, the filtrate is mixed with the overflow of the cyclone, and the red mud filter cake is sent to the red mud stockpile; the overflow of the cyclone is pumped into the high-efficiency solid-liquid separator, and the filtrate is solid If the content is lower than 30-15mg / l, it is the sodium aluminate refining solution to decompose; the filter cake is washed in the washing settling tank, and then discharged to the red mud stockpile after washing.

Embodiment 2

[0018] After dilution, the solid content of the slurry is about 250g / l, and the caustic Na 2 o K The concentration is 250g / l, pump the diluted slurry into the cyclone group, the solid content of the underflow is 400g / l, and the solid content of the overflow is 50-200g / l. The underflow of the cyclone enters the rubber belt filter for filtration and washing, the filtrate is mixed with the overflow of the cyclone, and the red mud filter cake is sent to the red mud stockpile; the overflow of the cyclone is pumped into the high-efficiency solid-liquid separator, and the filtrate is solid If the content is lower than 30mg / l, it is the decomposing process of the sodium aluminate refining solution; the filter cake is washed in the washing and settling tank, and then discharged to the red mud stockpile after washing.

Embodiment 3

[0020] After dilution, the solid content of the slurry is about 80g / l, and the caustic Na 2 o K The concentration is 200g / l. Pump the diluted slurry into the cyclone group, the solid content of the underflow is 200g / l, and the solid content of the overflow is 100g / l. The underflow of the cyclone enters the rubber belt filter for filtration and washing, the filtrate is mixed with the overflow of the cyclone, and the red mud filter cake is sent to the red mud stockpile; the overflow of the cyclone is pumped into the high-efficiency solid-liquid separator, and the filtrate is solid If the content is lower than 30mg / l, it is the decomposing process of the sodium aluminate refining solution; the filter cake is washed in the washing and settling tank, and then discharged to the red mud stockpile after washing.

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Abstract

A separating and washing method of red mud by Bayer process relates to a process improvement in the production process of aluminum oxide. The method is characterized in that the red mud in the Bayer process firstly passes through a swirler for preliminary separation, then the bottom flow of the swirler is filtered by adopting a rubber belt filter, the red mud is washed; the solid-liquid separation is carried out on the overflow of the swirler, the separated liquid phase is sodium sodium aluminate refining liquid which enters the decomposition process; the separated solid phase is a red mud filter cake which enters a settling tank for washing, and the red mud after washing is discharged to a red mud yard. The method realizes the filtration and the separation of the red mud in the Bayer process, has the capability of mandatory separation of the red mud in the Bayer process, is applicable to a variety of working conditions, can greatly improve the concentration of the sodium aluminate solution and can ensure the high-efficient operation of the aluminum oxide production in the Bayer process.

Description

technical field [0001] The invention discloses a Bayer process red mud separation and washing method, which relates to a process improvement in the production process of alumina. technical background [0002] In the production process of Bayer alumina, the ore undergoes pre-desilication, dissolution, sedimentation, separation and washing processes to obtain sodium aluminate solution and red mud. The separation of red mud and sodium aluminate solution generally adopts the method of settling red mud in a settling tank. The bottom flow of the settling tank enters the washing settling tank for multiple washings, and then discharges to the red mud yard; the overflow of the settling tank enters the leaf filter for filtration, and the filtrate is Sodium aluminate refined liquid goes to the decomposition process, and the filter cake is returned to the red mud washing system. [0003] Since the above-mentioned technology adopts the settling tank to separate the red mud, when the con...

Claims

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Application Information

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IPC IPC(8): C01F7/04B01D36/00
Inventor 张占明郭庆山张立强郝向东于斌
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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