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Method for improving two-stage decomposition effect

A seed, high-frequency multi-stage fine screening technology, applied in the direction of alumina/hydroxide, etc., can solve the problems that it is difficult to ensure the decomposition effect, quantitative control of seed particle size, etc., and achieve easy control, simple on-site commissioning and operation, and high operating efficiency high effect

Active Publication Date: 2015-12-30
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alumina crystal structure produced by this method is perfect, and the particle size and strength are good. However, due to the limitation of the operating mechanism of the hydrocyclone itself, the particle size of the seeds cannot be quantitatively controlled, so it is difficult to ensure the decomposition effect.

Method used

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  • Method for improving two-stage decomposition effect

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Effect test

Embodiment 1

[0019] As shown in the figure, a method of improving the effect of the second-stage decomposition of the present invention, the discharge of the second-stage decomposition seed sorting tank 3 is pumped to the high-frequency multi-stage fine screen 4, and the first-stage screen size of the high-frequency multi-stage fine screen 100μm, the aluminum hydroxide product 5 on the high-frequency multi-stage fine sieve 4 flows to the flat plate filter 6 by itself, and then enters the roasting furnace to obtain alumina products; the under-sieve of the high-frequency multi-stage fine screen 4 enters the second Screen, the size of the secondary screen of the high-frequency multi-stage fine screen is 70 μm, the secondary sieve is added as coarse seeds 7 to the first tank 2 of the second-stage decomposition, the secondary sieve 8 enters the fine seed settlement tank 9, and the fine seeds The overflow of the seed settling tank 9 and the mother liquor 10 are sent to the evaporation process 11,...

Embodiment 2

[0021] As shown in the figure, a method of improving the effect of the second-stage decomposition of the present invention, the discharge of the second-stage decomposition seed sorting tank 3 is pumped to the high-frequency multi-stage fine screen 4, and the first-stage screen size of the high-frequency multi-stage fine screen 150μm, the aluminum hydroxide product 5 on the high-frequency multi-stage fine sieve 4 flows to the flat plate filter 6 by itself, and then enters the roasting furnace to obtain alumina products; Screen, the size of the secondary screen of the high-frequency multi-stage fine screen is 50 μm, the secondary sieve is added as coarse seeds 7 to the first tank 2 of the second-stage decomposition, the secondary sieve 8 enters the fine seed settlement tank 9, and the fine seeds The overflow of the seed settling tank 9 and the mother liquor 10 are sent to the evaporation process 11, and the bottom flow of the fine seed settling tank 9 enters the fine seed filter ...

Embodiment 3

[0023] As shown in the figure, a method of improving the effect of the second-stage decomposition of the present invention, the discharge of the second-stage decomposition seed sorting tank 3 is pumped to the high-frequency multi-stage fine screen 4, and the first-stage screen size of the high-frequency multi-stage fine screen 130μm, the aluminum hydroxide product 5 on the sieve of the high-frequency multi-stage fine sieve 4 flows to the flat plate filter 6 by itself, and then enters the roaster to obtain alumina products; the under-sieve of the high-frequency multi-stage fine sieve 4 enters the second Screen, the size of the secondary screen of the high-frequency multi-stage fine screen is 80 μm, the secondary sieve is added as coarse seeds 7 to the first decomposition tank 2 of the second stage, the secondary sieve 8 enters the fine seed settlement tank 9, and the fine seeds The overflow of the seed settling tank 9 and the mother liquor 10 are sent to the evaporation process ...

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Abstract

The invention relates to a two-stage decomposition method. The method comprises the following steps: a discharged material of a two-stage decomposition end seed precipitation tank is pumped into a high-frequency multi-stage fine screen; an oversize product, namely, an aluminium hydroxide product, of the high-frequency multi-stage fine screen automatically flows into a horizontal pan filter, and then enters a roasting furnace, and an aluminium oxide product is obtained; a first-grade undersize product of the high-frequency multi-stage fine screen enters a secondary screen; a second-grade oversize product is added into a two-stage front decomposing tank as coarse seeds; a second-grade undersize product enters a fine seed settling tank; a seed precipitation mother solution overflows out of the fine seed settling tank, and is conveyed into an evaporation procedure; underflow of the fine seed settling tank flows into a fine seed filter; filtrate of the fine seed filter is returned to the fine seed settling tank; filter cakes of the fine seed filter are returned to a first-stage front seed precipitation tank as fine seeds. Compared with hydrocyclone classification, the method has the following advantages: the classification efficiency is high, the method is easy to control, the proportion of particles with the particle size smaller than 45 [mu]m in the aluminium oxide product is decreased, and the product conforms to the standard of sand-like aluminum oxide.

Description

technical field [0001] The invention relates to a two-stage decomposition method, in particular to a method for improving the two-stage decomposition effect of aluminum hydroxide products and the classification of coarse and fine seeds, and belongs to the technical field of alumina production. Background technique [0002] As the electrolytic aluminum industry pays more and more attention to the improvement of production conditions and environmental protection, the requirements of aluminum electrolysis for raw material alumina are also increasing day by day. The particle size of alumina products has a great influence on electrolytic aluminum. A high content of coarse particles larger than 150 μm will affect the dissolution rate of alumina in the electrolyte, while an increase in the content of fine particles smaller than 45 μm, especially smaller than 20 μm will increase the amount of dust in the electrolysis operation. Increase, and affect the accurate feeding of timing and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 张正勇李志国陈玉国
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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