Method for synergistically and efficiently oxidizing sulfur and organic matters in bauxite dissolution slurry

A bauxite and organic matter technology is applied in the field of synergistic high-efficiency bauxite ore dissolution of sulfur and organic matter in slurry, which can solve the problems of reduced equipment requirements and low organic matter removal rate, and achieves the effects of reducing investment costs and shortening reaction time.

Active Publication Date: 2021-02-02
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this method is applied in production, the equipment requirements are reduced, which is conducive to popularization and application. Its desulfuriza

Method used

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  • Method for synergistically and efficiently oxidizing sulfur and organic matters in bauxite dissolution slurry
  • Method for synergistically and efficiently oxidizing sulfur and organic matters in bauxite dissolution slurry

Examples

Experimental program
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Example Embodiment

[0054] Example 1

[0055] In the present embodiment bauxite, the alumina content is 56.29%, the silicon dioxide content is 10.01%, the sulfur content is 0.10%, the organic carbon content is 0.10%, and the mother liquor Nk is 243g / L, a k It is 2.90, and the amount of lime added is 10%. The pulp is preheated to 280°C and enters the first oxygenator with an inner diameter of 0.20m. After 50-60 minutes, the pulp of the oxygenator flows through 6 heat preservation tanks in turn, and then enters the second oxygenator with an inner diameter of 0.20m. The residence time is 0.5min; the ore pulp from the second oxygenator flows through the multi-stage self-evaporator to cool down to obtain the dissolution slurry.

[0056] Tested by chemical titration, the S in the dissolution slurry 2- The oxidation removal rate is 98%, S 2 o 3 2- 25% reduction in the content of the organic matter that enters the solution during the stripping process and the oxidation rate reaches 72%. In the abo...

Example Embodiment

[0057] Example 2

[0058] Aluminum oxide content is 57.31% in the present embodiment bauxite, and silicon dioxide content is 10.61%, and sulfur content is 0.80%, and organic carbon content is 0.40%, and mother liquor Nk is 243g / L, a k It is 2.90, and the amount of lime added is 10%. The pulp is preheated to 145°C and enters the first oxygenator with an inner diameter of 0.27m. After 50 to 60 minutes, the slurry in the tank flows through six heat preservation tanks in turn, and then enters the second oxygenator with an inner diameter of 0.27m. The time is 3.0min; the ore pulp from the two oxygenators flows through the multi-stage self-evaporator to cool down to obtain the dissolution slurry.

[0059] Tested by chemical titration, the S in the dissolution slurry 2- The oxidation removal rate is 98%, S2 o 3 2- The content of the organic matter is reduced by 30%, and the oxidation rate of the organic matter newly entering the solution reaches 71% during the stripping process....

Example Embodiment

[0060] Example 3

[0061] Aluminum oxide content is 56.21% in the present embodiment bauxite, and silicon dioxide content is 9.65%, and sulfur content is 0.60%, and organic carbon content is 0.10%, and mother liquor Nk is 240g / L, a k It is 2.90, and the amount of lime added is 10%. The pulp is preheated to 270°C and enters the first oxygenator with an inner diameter of 0.27m. After 50-60 minutes, the pulp of the oxygenator flows through 6 heat preservation tanks in sequence, and then enters the second oxygenator with an inner diameter of 0.27m. The residence time is 1.5min; the ore pulp from the two oxygenators flows through the multi-stage self-evaporator to cool down to obtain the dissolution slurry.

[0062] Tested by chemical titration, the S in the dissolution slurry 2- The oxidation removal rate is 98.5%, S 2 o 3 2- The content of the organic matter that enters the solution in the dissolution process is reduced by 30%, and the oxidation rate of the organic matter n...

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Abstract

The invention provides a method for synergistically and efficiently oxidizing sulfur and organic matters in bauxite dissolved slurry, and belongs to the technical field of aluminum oxide production. The method comprises the following steps that a first oxygenator is arranged on an ore pulp preheating pipeline of a Bayer process aluminum oxide production system, wherein the temperature of ore pulpin the ore pulp preheating pipeline is more than or equal to 145 DEG C; a second oxygenator is installed on an ore pulp pipeline before ore pulp enters a self-evaporator; and oxygen is introduced intothe first oxygenator and the second oxygenator to oxidize sulfur and organic matters in the ore pulp. The method not only can efficiently remove sulfur in the bauxite dissolution slurry, but also canefficiently remove organic matters in the bauxite dissolution slurry.

Description

technical field [0001] The invention belongs to the technical field of alumina production, and relates to a method for synergistically and efficiently dissolving sulfur and organic matter in slurry by alumina ore. Background technique [0002] The main sulfur-containing minerals in bauxite are pyrite (FeS 2 ) and its isomers marcasite and colloidite and gypsum CaSO 4 A class of sulfates, etc. In the Bayer process of alumina production, sulfur will first be converted to S 2- enters the solution in the form of sulfur, and is gradually oxidized into various forms of sulfur, such as SO 3 2- , S 2 o 3 2- and SO 4 2- Wait. The main hazard of sulfur in the Bayer process is first manifested in S 2- and S 2 o 3 2- etc. will accelerate the corrosion process of pulp heating, stripping system and evaporation system equipment, resulting in great safety hazards; secondly, it will increase the iron content in alumina products, and the chemical quality of products will deterio...

Claims

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Application Information

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IPC IPC(8): C01F7/06C01F7/46
CPCC01F7/0613C01F7/46C01P2006/80
Inventor 尹中林武国宝齐利娟路晓涛
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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