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High strength large particle aluminium hydroxide crystal seed decomposition method

An aluminum hydroxide and large particle technology, which is applied in the preparation of alumina/aluminum hydroxide, alumina, alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problem of uneven product particle size and wear coefficient. High problems, to achieve the effect of low decomposition start temperature, simple process and low temperature

Active Publication Date: 2006-08-02
中铝中州铝业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle size of the obtained product is not very uniform, and the wear coefficient is as high as about 24%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Industrial sodium aluminate solution for decomposition, its composition is: alumina content 105g / l, caustic ratio 1.52, A / S 680, seed crystal ratio 1.0, decomposition first tank temperature 50°C, decomposition final tank temperature 50°C, decomposition first The causticity ratio of the tank slurry is 2.0, the decomposition time is 70 hours, and the alumina decomposition rate is 55%. The average particle size D(50) of the decomposed aluminum hydroxide product is 74 μm, and the wear coefficient is 10%.

Embodiment 2

[0016] Industrial sodium aluminate solution for decomposition, its composition is: alumina content 105g / l, caustic ratio 1.52, A / S 680, seed crystal ratio 1.8, decomposition first tank temperature 55°C, decomposition final tank temperature 50°C, decomposition first The causticity ratio of the tank slurry is 2.1, the decomposition time is 72 hours, and the alumina decomposition rate is 55%. The average particle size D(50) of the decomposed aluminum hydroxide product is 75 μm, and the wear coefficient is 9.5%.

Embodiment 3

[0018] Industrial sodium aluminate solution for decomposition, its composition is: alumina content 105g / l, caustic ratio 1.52, A / S 680, seed crystal ratio 3, decomposition first tank temperature 60°C, decomposition final tank temperature 50°C, decomposition first The causticity ratio of the tank slurry is 2.2, the decomposition time is 72 hours, and the alumina decomposition rate is 54%. The average particle size D(50) of the decomposed aluminum hydroxide product is 76 μm, and the wear coefficient is 10.5%.

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PUM

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Abstract

A process for decomposing the high-strength big particles of aluminium hydroxide crystal seed includes such steps as cooling the refined liquid prepared by sinter method, proportionally addnig seeds of aluminium hydroxide, continuously flowing the slurry in each decomposing reactor, and decomposing for 70-72 hr.

Description

technical field [0001] A method for decomposing high-strength and large-grain aluminum hydroxide seed crystals relates to a production method for aluminum hydroxide, in particular to a high-strength and large-grain aluminum hydroxide production technology required for the production of artificial stone alumina or sandy alumina. Background technique [0002] The alumina production process used to produce artificial stone or sandy alumina requires the production of larger particle size and strength aluminum hydroxide. At present, especially due to the need for environmental protection and energy saving in the production of electrolytic aluminum, strict requirements are put forward for the properties of alumina. The replacement of powdery and intermediate alumina by sandy alumina with larger particle size and better strength will be the development trend in the future. [0003] International sandy alumina seed crystal decomposition technology, one is the sodium aluminate solut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14C01F7/02C01F7/38
Inventor 熊维平娄东民武福运吴长河刘伟程裕国李太昌王永红刘国红刘焦萍刘祥民刘亚平薛晓成杨燕徐力峰
Owner 中铝中州铝业有限公司