Method for low temperature desulphurization of sodium aluminate solution

A technology of sodium aluminate and solution, which is applied in the field of metallurgy and can solve the problems that high-sulfur bauxite cannot be applied industrially

Inactive Publication Date: 2014-11-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for low-temperature desulfurization of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 80g high sulfur bauxite, 400mL concentration is 250g / L (Na 2 O meter) sodium hydroxide solution, 4g CaO are placed in the autoclave, sealed, heated and stirred. When temperature reaches 230 DEG C, start counting, after stripping 2 hours, begin to cool down, when temperature is down to 105 DEG C, pass into oxygen. After reacting for 3 hours, it was taken out of the kettle and filtered. S in the obtained sodium aluminate solution 2- The content is 0.20g / L, and the desulfurization rate is 90.83%.

Embodiment 2

[0017] 80g high sulfur bauxite, 400mL concentration is 250g / L (Na 2 O meter) sodium hydroxide solution, 4g CaO are placed in the autoclave, sealed, heated and stirred. When temperature reaches 230 DEG C, start counting, after stripping 2 hours, begin to cool down, when temperature is down to 140 DEG C, pass into oxygen. After reacting for 3 hours, it was taken out of the kettle and filtered. S in the obtained sodium aluminate solution 2- The content is 0.17g / L, and the desulfurization rate is 92.90%.

Embodiment 3

[0019] 80g high sulfur bauxite, 400mL concentration is 250g / L (Na 2 O meter) sodium hydroxide solution, 4g CaO are placed in the autoclave, sealed, heated and stirred. When temperature reaches 230 DEG C, start counting, after stripping 2 hours, begin to cool down, when temperature is down to 150 DEG C, pass into oxygen. After reacting for 3 hours, it was taken out of the kettle and filtered. S in the obtained sodium aluminate solution 2- The content is 0.11g / L, and the desulfurization rate is 94.95%.

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Abstract

A method for low temperature desulphurization of a sodium aluminate solution is characterized in that low temperature oxidation desulphurization of the sodium aluminate solution which is a slurry obtained after high temperature dissolve-out of high sulfur bauxite through introducing oxygen in order to remove S<2-> in the sodium aluminate solution. A low temperature oxidation technology is adopted to oxidize the dissolve-out slurry of the high sulfur bauxite, so S<2-> in the sodium aluminate solution can be removed, and the desulfurization rate reaches above 90%. The method has the advantages of low operation temperature, good desulphurization effect, low energy consumption and the like.

Description

technical field [0001] A method for low-temperature desulfurization of sodium aluminate solution, in particular to a method for low-temperature desulfurization of sodium aluminate solution, which is slurry after high-sulfur bauxite is dissolved at high temperature. It belongs to the field of metallurgy technology. technical background [0002] In recent years, my country's alumina production has increased year by year. In 2012, my country's alumina production reached 37.696 million tons, an increase of 10.3% over 2011. Affected by the rapid development of my country's alumina industry, my country's bauxite mining volume is increasing year by year. In 2010, domestic bauxite output reached 31.45 million tons, an increase of 21.2 million tons compared with 2001, with an average annual increase of 24%. The bauxite mining volume is large, and the ratio of production to storage is basically the highest in the world. The poor guarantee ability of bauxite resources has seriously r...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 张亦飞游韶玮曹绍涛张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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