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Control method for b value of sodium aluminate solution

A control method, sodium aluminate technology, applied in the direction of preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve problems such as not being found, reduce b value, reduce b value of sodium aluminate solution, The effect of convenient control

Active Publication Date: 2009-01-14
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the domestic chemical alumina production process, the b value of the solution is mainly controlled by means of controlling the desiliconization process of the sodium aluminate solution, controlling the desiliconization depth, and controlling the float in the filtrate. The rise is often helpless, and I have not been able to find a way to effectively control the b value

Method used

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  • Control method for b value of sodium aluminate solution

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Effect test

Embodiment 1

[0012] The b-value control method of the sodium aluminate solution described in the present invention is to reduce the b-value of the solution by increasing the solution potential, take the sodium aluminate semen in the sintered alumina production process, raise the temperature to 85°C, keep the constant temperature, and pour into it Introduce air at a rate of 15L / min L for 15 minutes to make the potential of the solution reach 0.9V and make the Fe in the solution 2+ Oxidized to Fe 3+ And removed.

[0013] Some iron ions in the sodium aluminate solution are removed, the b value of the filtered sodium aluminate solution is reduced, and the sodium aluminate semen that meets the requirements for the production of chemical alumina (such as agate filler) is obtained. The test results are shown in Table 1.

Embodiment 2

[0015] The b-value control method of the sodium aluminate solution described in the present invention is to reduce the b-value of the solution by increasing the solution potential, take the sodium aluminate semen in the sintered alumina production process, raise the temperature to 90°C, keep the constant temperature, and inject Introduce air at a rate of 40L / min L for 20 minutes to make the potential of the solution reach 1.2V and make the Fe in the solution 2+ Oxidized to Fe 3+ And removed, the filtered sodium aluminate solution b value is reduced. The test results are shown in Table 1.

Embodiment 3

[0017] The b-value control method of the sodium aluminate solution described in the present invention is to reduce the b-value of the solution by increasing the solution potential, take the sodium aluminate semen in the sintered alumina production process, raise the temperature to 80°C, keep a constant temperature, and inject Introduce air at a rate of 30L / min·L for 15 minutes to make the potential of the solution reach 1.1V and make the Fe in the solution 2+ Oxidized to Fe 3+ And removed, the filtered sodium aluminate solution b value is reduced. The test results are shown in Table 1.

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Abstract

The invention relates to a control method of b value of a sodium aluminate solution, which belongs to the alumina production industrial technology, the b value of the solution is reduced through increasing the electric potential of the solution, and when the solution electric potential reaches 0.8 to 1.2V, an oxidizing agent can be added into the sodium aluminate solution for increasing the solution electric potential. The method can conveniently control the b value of the sodium aluminate solution, and achieve the purpose of reducing the b value of the sodium aluminate solution, thereby reducing the b value of aluminum hydroxide of products, and guaranteeing the product qualification rate.

Description

technical field [0001] The invention relates to a method for controlling the b value of a sodium aluminate solution, which belongs to the industrial technology of alumina production. Background technique [0002] With the development of chemical alumina, some application industries have continuously improved the quality requirements of chemical alumina, and proposed the chromaticity index requirements of alumina products. There are three chromaticity indexes, L value, a value and b value, alumina The fluctuation of production index will cause the chromaticity fluctuation of sodium aluminate solution, and then affect the product aluminum hydroxide. When using sodium aluminate solution to produce metallurgical grade aluminum hydroxide, there are no special requirements for L value, a value and b value, but when producing high value-added products such as aluminum hydroxide for agate filler, the products L, a, b Generally, the L value and a value in aluminum hydroxide can meet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
Inventor 杨会宾张爱民张淑珍周晓燕王智锦
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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