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Agent for improving stability of Bayer process red mud slurry and preparation method and application thereof

A Bayer process red mud and stability technology, applied in the preparation of alumina/hydroxide, alumina/aluminum hydroxide, etc., can solve the problems of reduced dissolution rate, serious hydrolysis loss, and increased alumina content in red mud. , to achieve the effect of improving stability

Pending Publication Date: 2021-12-10
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the special properties of overseas gibbsite ore, the stability of the red mud slurry after low-temperature dissolution is poor, resulting in serious hydrolysis loss in the separation and washing process of red mud, which leads to the increase of alumina content in red mud, resulting in ore Alumina net dissolution rate decreased
[0004] At present, after hydrolysis of the dissolved red mud of domestic diaspore bauxite, the dissolution rate of alumina can be reduced by about 1%, while the hydrolysis of the dissolved red mud of overseas gibbsite bauxite can lead to alumina The dissolution rate is reduced by more than 3%, and its hydrolysis loss is three times that of domestic bauxite

Method used

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  • Agent for improving stability of Bayer process red mud slurry and preparation method and application thereof
  • Agent for improving stability of Bayer process red mud slurry and preparation method and application thereof
  • Agent for improving stability of Bayer process red mud slurry and preparation method and application thereof

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preparation example Construction

[0037] According to another typical embodiment of the present invention, there is provided a preparation method of a medicament for improving the stability of Bayer process red mud slurry, the method comprising:

[0038] S1. the calcium salt is dissolved in the solvent to obtain a calcium salt solution;

[0039] S2. the cosolvent is mixed with the calcium salt solution to obtain a medicament;

[0040] Wherein, the mass concentration of the calcium salt solution is 50g / L-300g / L, and the mass concentration ratio of the calcium salt and the cosolvent is 0.005-100000.

[0041] Specifically, the calcium salt and the cosolvent solid are added to the pharmacy tank with a feeder, stirred evenly with hot water, the concentration of the calcium salt solution is controlled at 50-300g / L, and the cosolvent is added according to the material ratio. The water is provided by the hot water tank of the settling workshop, and the water temperature is 90-95 ℃.

[0042] According to another typi...

Embodiment 1

[0049] Using Guinea ore with A / F of 1.79, ore SiO 2 The content is 2.84%, the caustic alkali concentration of circulating mother liquor is 198g / L, α k It was dissolved at 145°C for 30 minutes without adding calcium salt and co-solvent. The A / F of the dissolved red mud was 0.22, and the initial dissolution rate of the ore was 87.7%. It was diluted with hot water to a caustic concentration of 150g / L. The solid content is 75g / L, and the sedimentation washing test is carried out. Zhongxin 352 flocculant is used, and the addition amount is 730g / t-dry red mud. After drying the red mud, the A / F of the red mud is 0.29, and the net dissolution rate of the ore is 0.29. 83.8%, and the dissolution rate due to hydrolysis loss decreased by 3.9%.

Embodiment 2

[0051] Using Guinea ore with A / F of 1.79, ore SiO 2 The content is 2.84%, the caustic alkali concentration of circulating mother liquor is 198g / L, α k is 2.97, solid CaSO 4 The addition amount is 4ppm / (m 3 Qualified pulp), the amount of sucrose added is 1ppm / (m 3 Qualified ore pulp), dissolved at 145 ° C for 30 minutes, the A / F of the dissolved red mud was 0.22, and the initial dissolution rate of the ore was 87.7%. In the sedimentation washing test, Zhongxin 352 flocculant was used, and the addition amount was 730g / t-dry red mud. After drying the red mud, the A / F of the red mud was 0.27, and the net dissolution rate of the ore was 84.9%. The dissolution rate decreased by 2.8%.

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Abstract

The invention particularly relates to an agent for improving the stability of Bayer process red mud slurry and a preparation method and application thereof, and belongs to the technical field of aluminum oxide production. The agent comprises calcium salt and a cosolvent, wherein the adding amount of calcium salt solid is 5-10000 ppm / (m < 3 > qualified ore pulp), and the adding amount of the cosolvent pure reagent is 0.1-1000 ppm / (m < 3 >qualified ore pulp). In the process of low temperature dissolution of overseas ore, a trace amount of calcium salt and the cosolvent are added, so that crystals of a desilicication product dissolved out of the red mud are more perfect; and the aluminum oxide hydrolysis loss of the red mud in the dilution, separation and washing processes is reduced by reducing the activity of the sodium silicon slag and improving the stability of red mud slurry.

Description

technical field [0001] The invention belongs to the technical field of alumina production, and particularly relates to an agent for improving the stability of Bayer process red mud slurry and a preparation method and application thereof. Background technique [0002] With the rapid development of my country's alumina industry, alumina production capacity and output are the world's first, accounting for more than 50% of the world. However, my country's bauxite resources are relatively insufficient, with 3.3% of the world's bauxite producing more than half of the world's alumina. Domestic bauxite resources are increasingly scarce, and various alumina enterprises have begun to use overseas mines to produce alumina. [0003] Due to the special properties of overseas gibbsite mines, the stability of the red mud slurry after low temperature dissolution is poor, resulting in serious hydrolysis loss during the separation and washing process of red mud, resulting in an increase in t...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/30
CPCC01F7/02C01F7/30Y02P10/20
Inventor 邵帅武国宝齐利娟杨会宾
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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