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Small two-stage method aluminium hydroxide crystal seed decomposing method

A technology of aluminum hydroxide and two-stage method, which is applied in the direction of aluminum oxide/aluminum hydroxide, to achieve the effects of reasonable process, good economic and social benefits, and simple operation

Active Publication Date: 2009-10-14
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a small two-stage aluminum hydroxide seed decomposition method, which solves the problem of sandy products, improves product quality, and can obtain a higher decomposition rate at the same time

Method used

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  • Small two-stage method aluminium hydroxide crystal seed decomposing method

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Comparison scheme
Effect test

Embodiment 1

[0011] Use 20% of the 81°C decomposed stock solution for high-temperature agglomeration, and the other 80% of the decomposed stock solution is cooled to 61°C and decomposed by a one-stage method. The average content of the product aluminum hydroxide-45μ is 14.5%, the decomposition rate is 52.12%, and the output rate is 84.84 kg-A0 / m 3 -semen.

Embodiment 2

[0013] Use 25% of the 81°C decomposed stock solution for high-temperature agglomeration, and the other 75% of the decomposed stock solution is cooled to 61°C and decomposed by a one-stage method. The average content of the product aluminum hydroxide-45μ is 12.5%, the decomposition rate is 52.75%, and the output rate is 85.02 kg-A0 / M 3 -semen.

Embodiment 3

[0015] Use 45% of the 78°C decomposed stock solution for high-temperature agglomeration, and the other 55% of the decomposed stock solution is cooled to 63°C and decomposed by a one-stage method. The average content of the product aluminum hydroxide-45μ is 13.5%, the decomposition rate is 52.35%, and the output rate is 85.01 kg-A0 / m 3 -semen.

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Abstract

The invention relates to a small two-stage method for decomposing aluminum hydroxide seeds. The overflow of the flow device is pumped into the secondary cyclone, which is characterized in that the filter cake after the overflow of the secondary cyclone is filtered by the fine seed filter and 20-50% of the decomposed stock solution are attached in the agglomeration seed sub-tank. After agglomeration, the agglomerated slurry enters the long head tank after cooling; the filter cake and the remaining decomposed stock solution after the secondary cyclone underflow is filtered through the coarse seed filter still use the one-stage method to enter the long head tank for continuous decomposition. The problem of product sandiness is solved, the product quality is improved, and a higher decomposition rate can be obtained at the same time.

Description

technical field [0001] The invention relates to an improved method for decomposing aluminum hydroxide seed crystals, which belongs to the production process of alumina. Background technique [0002] The decomposition of sodium aluminate solution mainly adopts carbon decomposition and seed decomposition. The decomposition of seed is generally divided into one-stage method and two-stage method. The seed crystals are decomposed; the two-stage method is that the decomposition stock solution at a higher temperature (generally 75°C to 85°C) is first agglomerated with the classified fine-grained seed crystals at high temperature, and then the coarse-grained seed crystals are gradually reduced in temperature and decomposed. The one-stage method (high solid content) has a higher decomposition rate, but the particle size index is not ideal, and generally produces flour-like alumina; the second-stage method (low solid content) has a low decomposition rate, but the particle size index i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 张玉明王利娟李福强田朝波杨光
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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