Two stage decomposition process method of Bayer process alumina production

A technology of alumina and Bayer method, which is applied in the direction of alumina/aluminum hydroxide, can solve the problems of aluminum hydroxide crystal growth, aluminum hydroxide crystal cracking and abrasion, etc., to achieve improved particle size and strength, good economic benefits, The effect of a good sale price

Active Publication Date: 2015-04-08
GUIYANG AL-MG DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. Cracking and abrasion of aluminum hydroxide crystals
[0006] 3. Growth of aluminum hydroxide crystals
[0007] 4. Agglomeration of aluminum hydroxide grains

Method used

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  • Two stage decomposition process method of Bayer process alumina production

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment one: as attached figure 1 As shown, the semen filtered out from the control is divided into two paths through the plate heat exchanger for heat exchange, a part (30%) is heated at 80°C after heat exchange through the plate heat exchanger, and becomes hot semen, and the other part (70%) %) control the temperature after heat exchange at 65°C to become cold semen; the hot semen and the filter cake of the fine seed filter 11 are mixed in the fine seed seed tank 12 to become fine seed slurry, and the temperature of the mixed slurry is controlled At about 77°C, with a solid content of 150g / l, the seeds are pumped to the decomposition tank 1 of the agglomeration section for agglomeration; the cold semen is mixed with the filter cake of the coarse seed filter 13 in the coarse seed crystal tank 14 to form Coarse seed slurry, the mixed slurry temperature is controlled at 62°C, with a solid content of 450g / l, and is pumped to the first tank 4 of the decomposed growth se...

Embodiment 2

[0024] Embodiment two: as attached figure 1 As shown, the semen filtered out from the control is divided into two paths for heat exchange through the plate heat exchanger, and a part (35%) becomes hot semen at a temperature of 76°C after heat exchange through the plate heat exchanger, and the other part (65%) ) control the temperature after the heat exchange at 62°C to become cold semen, and the hot semen and the filter cake of the fine seed filter 11 are mixed in the fine seed crystal seed tank 12 to become fine seed slurry, and the temperature of the mixed slurry is controlled at At about 75°C, with a solid content of 120g / l, it is pumped to the decomposition tank 1 of the agglomeration section through the seed crystal for agglomeration; the cold semen is mixed with the filter cake of the coarse seed filter 13 in the coarse seed crystal tank 14 to form a coarse semen For the seed slurry, the temperature of the mixed slurry is controlled at 60° C., and the solid content is 30...

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Abstract

The present invention discloses a two stage decomposition process method of Bayer process alumina production. According to the method, a fine liquid obtained from control filtration and a decomposition mother liquor are subjected to heat exchange through a plate type heat exchanger to obtain a hot fine liquid and a cold fine liquid; the hot fine liquid is mixed with filter cake of a fine seed filter to form a fine seed slurry, and the fine seed slurry is conveyed to an agglomeration segment decomposition first tank through a crystal seed pump to carry out agglomeration decomposition; the cold fine liquid is mixed with filter cake of a coarse seed filter to form a coarse seed slurry, and the coarse seed slurry is conveyed to a growth segment decomposition first tank through a crystal seed pump to carry out growth; the fine seed slurry stays for 4-6 h in the agglomeration segment decomposition first tank, is conveyed to a middle temperature reduction cooler through a submerged pump, is subjected to heat exchange with circulation water, and then enters the growth segment decomposition first tank; the treated fine seed slurry and the coarse seed slurry are continuously subjected to decomposition growth; an end washing fine seed slurry obtained from a fine seed slurry settlement tank is added; the mixed slurry is continuously subjected to decomposition growth in the decomposition first tank; and after completing decomposition growth, the submerged pump is adopted to convey the slurry to a finished product hydrocyclone to grade, and the bottom flow of the hydrocyclone is adopted as a finished product slurry.

Description

technical field [0001] The present invention relates to a decomposed flow process for Bayer process alumina production. Background technique [0002] Seed decomposition is one of the key processes in the production of alumina by the Bayer process, and it has a significant impact on the output and quality of the product as well as the technical and economic indicators of the whole plant. The main indicators to measure the effect of sorting operation are the quality of aluminum hydroxide, the decomposition rate and the unit capacity of the decomposition tank. [0003] The seeding process of sodium aluminate solution is not only the growth of simple seed crystals, but also some other physical and chemical changes. Many phenomena and research results show that the whole aluminum hydroxide precipitation and crystallization process is extremely complicated, including: [0004] 1. Formation of secondary crystal nuclei [0005] 2. Cracking and abrasion of aluminum hydroxide crysta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 白英伟
Owner GUIYANG AL-MG DESIGN & RES INST
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