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Method for direct desulfurization in alumina production

An alumina, direct technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of easy product contamination, increase of large-scale equipment, high desulfurization cost, low cost, avoid secondary pollution, and good effect.

Active Publication Date: 2011-09-07
GUIZHOU BRANCH CHINA ALUMINUM IND
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AI Technical Summary

Problems solved by technology

[0007] Provide a method for direct desulfurization of alumina production to solve technical problems in the prior art such as the need to increase large-scale equipment, products are easily polluted, high desulfurization costs, and high energy consumption, so that high-sulfur bauxite can be directly used in alumina production middle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] When dealing with high-sulfur ore with an aluminum-silicon ratio of 10.8 and a sulfur content of 1.92%, the composite additive for desulfurization is first prepared. According to the ratio of 58% of hemimorphite and 42% of lime, add it to the roller crusher and disc mill for grinding, the particle size is +100 mesh ≤ 10%, +160 mesh ≤ 20%, and the ground material is fully mixed evenly After that, it is made into a composite additive. The composite additive and high-sulfur bauxite are added into the alumina production batching process at a ratio of 2%:98%, and the raw ore slurry is made into a raw ore slurry through grid grinding, and then enters a high-pressure dissolution process. During the high-pressure dissolution process, Zn 2+ with S 2- Fully react to form ZnS precipitate, after sedimentation and filtration, ZnS precipitate is discharged together with red mud to achieve the purpose of desulfurization.

Embodiment 2

[0021] The composite additive and high-sulfur bauxite are added to the alumina production batching process at a ratio of 5%:95%, and the rest of the steps are the same as in Example 1.

Embodiment 3

[0023] When dealing with high-sulfur ore with an aluminum-silicon ratio of 10.9 and a sulfur content of 2.62%, the composite additive for desulfurization is first prepared. According to the ratio of 80% of hemimorphite and 20% of lime, add it to the roller crusher and disc mill to grind, the particle size is +100 mesh ≤ 10%, +160 mesh ≤ 20%, and the ground material is fully mixed evenly After that, it is made into a composite additive. The composite additive and high-sulfur bauxite are added into the alumina production batching process at a ratio of 9%:91%, and the raw ore slurry is made into a raw ore slurry through grid grinding, and enters a high-pressure dissolution process. During the high-pressure dissolution process, Zn 2+ with S 2- Fully react to form ZnS precipitate, after sedimentation and filtration, ZnS precipitate is discharged together with red mud to achieve the purpose of desulfurization.

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Abstract

The invention discloses a method for direct desulfurization in alumina production, comprising the following steps: in the alumina production, directly adopting high-sulfur alumyte containing the sulfur content of 1-3%, adding a compound additive used for desulfurization in the process of material proportioning, high pressure leaching, evaporation or decomposition and obtaining qualified finished aluminum hydroxide or alumina according to the prior process of the alumina production. Compared with the prior art, the invention has the advantages of direct application of the high-sulfur alumyte to the current alumina production, low cost, good desulfurization effect, simple operation, easy control, and the like.

Description

Technical field: [0001] The invention belongs to the technical field of desulfurization in alumina production, in particular to a method for direct desulfurization in alumina production. Background technique: [0002] In the process of producing alumina by Bayer method, sulfur entering the process will corrode equipment, increase alkali consumption and energy consumption, hinder normal production operation, deteriorate production control indicators, and affect product quality. Therefore, high-sulfur bauxite cannot be directly used for oxidation Aluminum production must be desulfurized. At present, the desulfurization methods of high-sulfur bauxite include ore dressing desulfurization method and roasting desulfurization method. The mineral processing desulfurization method must be equipped with a series of mineral processing equipment, the degree of ore grinding is large, and the organic material type mineral processing agents used will cause secondary pollution. Although th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 王强李桂兰刘文义邹韶宁林齐张晓敏何璞睿
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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