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Alumina carbon mother liquid processing method

A carbon separation mother liquor and alumina technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of high energy consumption in the firing process, limited application and popularization, and difficulty in realization, so as to save evaporation energy consumption, improve economy, Effect of reduction in sintering energy consumption

Active Publication Date: 2012-01-04
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The series method and sintering method are effective processes for processing low-grade bauxite, but the high energy consumption of the sintering process limits its application and promotion. In order to greatly reduce the energy consumption of clinker sintering, alumina scientists have The development of preheating and drying technology outside the raw pulp kiln has been carried out, but because the alkali red mud slurry and carbon content mother liquor in the preparation of raw pulp bring in a lot of water, reaching about 40%, it is difficult to realize this technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Get 4 liters of industrial carbon fraction mother liquor, stir at 90°C and feed a mixed gas with a concentration of 38% carbon dioxide and air, so that 96% of sodium carbonate in the solution is converted into sodium bicarbonate, then stop the ventilation, and add the original The sodium carbonate solid of 10% sodium carbonate content in the carbon separation mother liquor was stirred for 5 minutes, and the stirring was stopped, and the slurry was separated with a centrifuge to obtain a 3.5% sodium bicarbonate, aluminum hydroxide and franetonite solid mixture, The precipitation rate of sodium bicarbonate in the mother liquor is 91%.

Embodiment 2

[0017] Get 4 liters of industrial carbon fraction mother liquor, stir at 95°C and feed a mixed gas with a concentration of 38% carbon dioxide and air, so that 99% of sodium carbonate in the solution is converted into sodium bicarbonate, then stop the ventilation, and add the original The sodium carbonate solid of sodium carbonate content 15% in the carbon separation mother liquor was stirred 5 minutes, stopped stirring, and this slurry was separated with the centrifuge and obtained the sodium bicarbonate, aluminum hydroxide and frasonite solid mixture that attached water was 5.5%, The precipitation rate of sodium bicarbonate in the mother liquor is 96%.

Embodiment 3

[0019] Get 4 liters of industrial carbon fraction mother liquor, stir at 85°C and feed a mixed gas with a concentration of 38% carbon dioxide and air, so that 95% of sodium carbonate in the solution is converted into sodium bicarbonate, then stop the ventilation, and add the original The sodium carbonate solid of sodium carbonate content 12% in the carbon separation mother liquor was stirred 5 minutes, stopped stirring, and this slurry was separated with the centrifuge and obtained the sodium bicarbonate, aluminum hydroxide and the frasonite solid mixture that attached water was 4.2%, The precipitation rate of sodium bicarbonate in the mother liquor is 93%.

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PUM

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Abstract

The invention provides an alumina carbon mother liquid processing method, which relates to an alumina production process by a serial connection method or a sintering method. The invention is characterized in that the process comprises the following steps: (1) introducing carbon dioxide gas into the alumina carbon mother liquid so that all remained alumina can be separated out after the alumina carbon mother liquid is carbonated, and continuously introducing the carbon dioxide for converting the sodium carbonate in the carbon mother liquid into sodium bicarbonate; (2) adding the sodium carbonate into the over carbonated sodium bicarbonate solution so that the separation rate of the sodium bicarbonate reaches more than 90 percent; and (3) separating slurry after the separation of the sodiumbicarbonate to obtain a mixture of the sodium bicarbonate, the aluminum hydroxide and the dawsonite with the attached water weight lower than 6 percent to be used for preparing raw material slurry. In the method of the invention, the carbon evaporation mother liquid with 220g / l sodium carbonate is converted into sodium bicarbonate crystals with the moisture content lower than 6 percent, the evaporation energy consumption is saved, in addition, the raw material moisture is reduced by 20 percent, and the energy consumption of the raw material sintering can be reduced by 40 percent.

Description

technical field [0001] The invention relates to a method for treating alumina carbon fraction mother liquor, which relates to a method for preparing raw slurry by crystallizing sodium carbonate from carbon fraction mother liquor in the production process of alumina by series method or sintering method. Background technique [0002] The series method and sintering method are effective processes for processing low-grade bauxite, but the high energy consumption of the sintering process limits its application and promotion. In order to greatly reduce the energy consumption of clinker sintering, alumina scientists have The development of preheating and drying technology outside the raw pulp kiln has been carried out, but because the alkali red mud slurry and carbon content mother liquor for preparing the raw pulp bring in a lot of water, reaching about 40%, this technology is also difficult to realize. If the sodium carbonate in the carbon separation mother liquor is crystallized...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 杨志民
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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