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Three stages, two seeds technique of seed crystal decomposition

A seed and process technology, applied in the field of three-stage two-seed separation and decomposition process, can solve the problem of not being industrially applied, and achieve the effects of high strength, excellent product quality and saving power consumption.

Active Publication Date: 2007-12-26
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have not been applied in industry. Therefore, it is necessary to explore a new way to strengthen the seed separation process of sodium aluminate solution, overcome the shortcomings of various methods, and realize the "three highs" of the seed separation process.

Method used

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  • Three stages, two seeds technique of seed crystal decomposition

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Embodiment 1

[0068] The three-stage two-seed decomposition process of the present invention divides the seed separation process into four parts: agglomeration decomposition section, seed crystal growth decomposition section, secondary nucleation control and enhanced decomposition. Specific process parameters: seed crystal tank temperature 50°C , the agglomeration tank temperature is 70°C, the seed ratio is 0.35, the seed growth and decomposition tank temperature is 60°C, the seed crystal fineness is 70 μm, the seed crystal amount is 500g / l, and the seed ratio is 2.5; the enhanced decomposition tank temperature is 50°C, and the seed crystal fineness 25μm, the seed crystal amount is 500g / l, and the decomposition rate is 58.5%.

Embodiment 2

[0070] The three-stage two-seed decomposition process of the present invention divides the seed separation process into four parts: agglomeration decomposition section, seed crystal growth decomposition section, secondary nucleation control and enhanced decomposition. Specific process parameters: seed crystal tank temperature 50°C , agglomeration tank temperature 65°C, seed ratio 0.40, seed crystal growth decomposition tank temperature 60°C, seed crystal fineness 70μm, seed crystal volume 500g / l, seed ratio 3.0; enhanced decomposition tank temperature 45°C, seed crystal fineness 20μm, the seed crystal amount is 600g / l, and the decomposition rate is 59.5%.

Embodiment 3

[0072] The three-stage two-seed decomposition process of the present invention divides the seed separation process into four parts: agglomeration decomposition section, seed crystal growth decomposition section, secondary nucleation control and enhanced decomposition. Specific process parameters: seed crystal tank temperature 50°C , agglomeration tank temperature 60°C, seed ratio 0.40, seed crystal growth decomposition tank temperature 60°C, seed crystal fineness 60μm, seed crystal volume 600g / l, seed ratio 3.5; enhanced decomposition tank temperature 45°C, seed crystal fineness 18μm, the seed crystal amount is 600g / l, and the decomposition rate is 60.1%.

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Abstract

This invention relates to a three-stage two-seed seed crystal decomposing process. The process comprises: passing the mother liquor through an agglomeration decomposer and a seed crystal growth decomposer in order, adding decomposing seed crystal into the seed crystal growth decomposer, then passing through a reinforced decomposer, adding fine seed crystal into the reinforced decomposer, sending the overflow liquid of the reinforced decomposer to a leaf filter to obtain decomposed mother liquor, recovering fine seed crystal from the leaf filter, returning to the reinforced decomposer, returning seed crystal from the reinforced decomposer to the agglomeration decomposer, and sending part of the mother liquor via the seed crystal growth decomposer to the reinforced decomposer for circulation. The process has such advantages as reasonable procedures, low energy consumption, low cost, easy control, high decomposition rate and high product quality.

Description

technical field [0001] The invention relates to a three-stage two-seed decomposition process, which is used in the industrial production of alumina. Background technique [0002] In the process of industrial alumina production, the seed separation process is the longest process in the production process due to the slow decomposition rate of sodium aluminate solution. The fundamental reason why a series of problems in the decomposition process of sodium aluminate solution are difficult to solve is that people lack essential understanding of the structural properties and decomposition mechanism of supersaturated sodium aluminate solution. In the alumina production system, the special stability of sodium aluminate solution is very different from that of general supersaturated inorganic salt solution. Although a large amount of experimental data has been accumulated after hundreds of years of research, due to the complexity of the structure and special behavior of sodium alumina...

Claims

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Application Information

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IPC IPC(8): C01F7/04C01F7/14B01D9/02
Inventor 孟令利刘辉李广战陈玉海
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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