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Ash conversion method in alumina preparation

A technology of alumina and aluminum hydroxide, which is applied in alumina/aluminum hydroxide, alumina/hydroxide preparation, chemical instruments and methods, etc., can solve problems such as alumina loss, reduce energy consumption, reduce water consumption, etc. copies, the effect of simplifying the process

Active Publication Date: 2009-09-23
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of cooling and diluting the dissolved ore pulp, calcium aluminate hydrate will be formed, resulting in the loss of alumina; moreover, in order to improve the filtration capacity of the leaf filter, lime milk is added as a filter aid. This process also loss of alumina

Method used

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  • Ash conversion method in alumina preparation

Examples

Experimental program
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Effect test

example 1

[0014] Measure 100ml of the sintering method aluminum hydroxide washing solution, weigh 50g of dry lime powder; use the aluminum hydroxide washing solution to make dry lime powder at a temperature of 40°C for 10 minutes, and carry out physical and chemical analysis on the synthesized composite milk of lime. Its physical phase includes calcium hydroxide, calcium aluminate hydrate, calcium aluminum carbonate hydrate, etc. The effective calcium content of chemical analysis is 210g / L, and the deep desilication test is carried out on the primary semen of the sintering method with an effective calcium content of 6g / L. The desiliconization temperature was 92°C and the desiliconization time was 1.5 hours, and the silicon content index reached 1060.

example 2

[0016] Measure 200ml of the sintering method aluminum hydroxide washing solution, weigh 50g of dry lime powder, use the aluminum hydroxide washing solution at a temperature of 40°C to make dry lime powder for 30 minutes, and carry out physical and chemical analysis on the synthesized composite milk of lime. Its physical phase includes calcium hydroxide, calcium aluminate hydrate, calcium aluminum carbonate hydrate, etc. The effective calcium content of chemical analysis is 186g / L, and the deep desiliconization test is carried out on the sintering method with an effective calcium content of 6g / L. The desiliconization temperature was 92°C and the desiliconization time was 1.5 hours. The result was a silicon content index of 938.

example 3

[0018] Measure 300ml of the sintering method aluminum hydroxide washing solution, weigh 50g of dry lime powder, use the aluminum hydroxide washing solution at a temperature of 50°C to make dry lime powder for 10 minutes, and carry out physical and chemical analysis on the synthesized composite milk of lime. Its phases include calcium hydroxide, calcium aluminate hydrate, calcium aluminum carbonate hydrate, etc. The effective calcium content of chemical analysis is 181g / L, and the deep desiliconization test is carried out on the sintering method with an effective calcium content of 6g / L. The desiliconization temperature was 92°C, and the desiliconization time was 2.0 hours. The result was a silicon content index of 985.

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Abstract

The invention relates to an ashing method in alumina production, which relates to a process improvement for producing alumina by using bauxite as raw material by sintering method, Bayer method or Bayer-sintering combined method. It is characterized in that it uses the sintering method or Bayer method in the production of alumina, the aluminum hydroxide washing solution and the dry lime powder have a liquid-solid weight ratio of 2 / 1 to 10 / 1, a temperature of 50 to 90°C, and a time of 10 to 60 Minutes to synthesize composite milk of lime. In the method of the present invention, the milk of lime used in the sintering method or the Bayer method system in the alumina production can be made by replacing the hydration with the dilute alkali solution in the own system. Reduces moisture and evaporation loads in the process. In addition, the temperature of the aluminum hydroxide washing solution in alumina production can meet the temperature required for ashing, and no heating device is required. This simplifies the process and reduces energy consumption. The aluminum hydroxide washing solution is no longer directly returned to the alumina production process, eliminating the disadvantages of increased evaporation load and increased caustic ratio of the solution.

Description

technical field [0001] The invention relates to an ashing method in alumina production, which relates to a process improvement for producing alumina by using bauxite as raw material by sintering method, Bayer method or Bayer-sintering combined method. Background technique [0002] In the process of producing alumina from diaspore bauxite, the sintering system has a special desiliconization process, and the desiliconization additives used include: lime milk, calcium aluminate hydrate, calcium aluminate hydrate, etc., traditional The preparation method is as follows: milk of lime is prepared by heating quicklime with hot water; calcium aluminate hydrate or calcium carbonoaluminate is synthesized with sodium aluminate refined liquid or sintering method and milk of lime under certain conditions. As a result, a large amount of water is brought into the process, which increases the load on the originally tense evaporation system; moreover, the cost of using sodium aluminate semen ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01F7/20C01F7/30
Inventor 张立强李光柱赵培生赵志英吕鲜翠白永民王浩王晓军
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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