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Method for preparing alumina through bauxite containing sulphur

A technology of bauxite and alumina, which is applied in the direction of alumina/hydroxide, etc., can solve the problems of unsatisfactory electrolytic aluminum process, complex process flow, poor whiteness of alumina, etc., and achieve low production cost and simple process flow Effect

Inactive Publication Date: 2012-10-10
GUIZHOU BRANCH CHINA ALUMINUM IND
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Problems solved by technology

The main reason is that the alumina produced from high-sulfur bauxite has poor whiteness and high impurities, which cannot meet the requirements of the electrolytic aluminum process
Second, sulfur is extremely corrosive to production equipment during the alumina production process (obvious after sulfur stays for more than 72 hours)
Third, the alkali consumption of producing alumina from sulfur-containing ores is relatively high
At present, only a few manufacturers use high-sulfur bauxite to produce alumina in China. The process is to process and desulfurize the sulfur-containing bauxite, and then use the conventional Bayer process to obtain metallurgical-grade alumina. The process of this method is complicated. , higher production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The bauxite containing 2.2% sulfur is processed by the conventional Bayer method to obtain a diluted pulp with an alumina concentration of 180g / l. After adding barium aluminate for purification at 0.5% (weight ratio of barium aluminate to diluted pulp), sodium aluminate The solution is decomposed and roasted, and the white alumina product obtained has a whiteness of 92%.

Embodiment 2

[0015] The bauxite containing 0.9% sulfur is processed by the conventional Bayer method to obtain a sodium aluminate solution with an alumina concentration of 176g / l, which is purified by adding barium aluminate at 0.2% (weight ratio of barium aluminate to crude sodium aluminate solution) Finally, the sodium aluminate solution is decomposed and roasted, and the white alumina product obtained has a whiteness of 94%.

Embodiment 3

[0017] The bauxite containing 0.9% sulfur is processed by the conventional Bayer method to obtain an untreated sodium aluminate solution with an alumina concentration of 180g / l, which is decomposed and roasted to obtain a gray alumina product with a whiteness of 65%.

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Abstract

The invention discloses a method for preparing alumina through bauxite containing sulphur, and relates to a method adopting a normal Bayer process for processing high-sulphur bauxite to prepare alumina. The preparation process adopts the Bayer process. The method is characterized in that barium aluminate is added in the preparation process. The method provided by the invention adopts the normal Bayer process for processing the high-sulphur bauxite to prepare the white alumina. Slurry containing sulphur is obtained by pulverizing, dissolving out and diluting the high-sulphur bauxite. The while alumina which satisfies the index requirement of the white degree of metallurgical-grade alumina is obtained by adding 0.01 to 1 percent by weight of the barium aluminate for removing sulphur and iron removal and decolorizing processing through decomposition and calcinations. The method has a simple technical flow and a low production cost.

Description

technical field [0001] The invention relates to a method for preparing alumina from sulfur-containing bauxite, which relates to a method for preparing alumina by treating high-sulfur bauxite with a conventional Bayer process. Background technique [0002] my country's proven high-sulfur bauxite is about 500 million tons, most of which have not been utilized. The main reason is that the alumina produced from high-sulfur bauxite has poor whiteness and high impurities, which cannot meet the requirements of the electrolytic aluminum process. The second is that sulfur is extremely corrosive to production equipment during the alumina production process (obvious after sulfur stays for more than 72 hours). The third is that the alkali consumption of producing alumina from sulfur-containing ores is relatively high. At present, only a few manufacturers use high-sulfur bauxite to produce alumina in China. The process is to process and desulfurize sulfur-containing bauxite, and then u...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 赵培生黄安平郭晋梅
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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