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Method for desilication of high-concentration sodium aluminate solution

A sodium aluminate, high-concentration technology, applied in alumina/aluminum hydroxide and other directions, can solve problems such as the inability to meet the requirements of sodium aluminate semen silicon content index, and achieve the effect of reducing process energy consumption and process energy consumption.

Inactive Publication Date: 2010-10-13
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the increase in the concentration of alumina in semen, SiO 2 The concentration of SiO is also greatly increased, up to about 10g / L, and SiO under corresponding conditions 2 The equilibrium concentration is also high, so the traditional pressurized desiliconization and atmospheric pressure deep desilication process with lime milk cannot meet the requirements of carbonation decomposition on the silicon content index of sodium aluminate semen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The alumina concentration of the sodium aluminate solution is 153g / L, and the caustic ratio of the solution is 1.50. The amount of red mud seeds added is 60g / L, the temperature is 95°C, and the time is 2.5 hours, stirring. The silicon content index of the sodium aluminate solution was 186 after a period of normal pressure desiliconization. The alumina concentration of the second-stage atmospheric desiliconization stock solution is 150g / L, the caustic ratio of the solution is 1.51, the amount of synthetic additives added is 50g / L, the amount of lime added is 10g / L, the temperature is 95°C, the time is 2.5 hours, and stirred. The alumina concentration of the sodium aluminate solution was 145g / L after the second-stage atmospheric pressure desiliconization, and the silicon content index was 1069.

Embodiment 2

[0021] The alumina concentration of the sodium aluminate solution is 165g / L, and the caustic ratio of the solution is 1.45. The amount of red mud seeds added is 60g / L, the temperature is 95°C, and the time is 2.5 hours, stirring. The silicon content index of the sodium aluminate solution was 180 after a period of normal pressure desiliconization. The alumina concentration of the second-stage atmospheric desiliconization stock solution is 162g / L, the caustic ratio of the solution is 1.51, the amount of synthetic additives added is 50g / L, the amount of lime added is 10g / L, the temperature is 95°C, the time is 2.5 hours, and stirred. The alumina concentration of the sodium aluminate solution after the second-stage desiliconization at atmospheric pressure is 155g / L, and the silicon content index is 855.

Embodiment 3

[0023] The alumina concentration of the sodium aluminate solution is 168g / L, and the caustic ratio of the solution is 1.39. The amount of red mud seeds added is 60g / L, the temperature is 95°C, and the time is 3.0 hours, stirring. The silicon content index of the sodium aluminate solution was 189 after a period of normal pressure desiliconization. The alumina concentration of the second-stage atmospheric desiliconization stock solution is 161g / L, the caustic ratio of the solution is 1.42, the amount of synthetic additives added is 50g / L, the amount of lime added is 10g / L, the temperature is 95°C, the time is 2.0 hours, and stirred. The alumina concentration of the sodium aluminate solution after the second-stage atmospheric pressure desilication is 156g / L, and the silicon content index is 913.

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Abstract

The invention relates to a method for desilication of high-concentration sodium aluminate solution, in particular to a method for desilication of high-concentration sodium aluminate solution obtained during production of aluminum oxide in an enhanced sintering method, which is characterized by comprising the following steps: (1) adding sodium aluminate solution in red mud of the Bayer process as a seed for a period time of desilication reaction under the atmospheric pressure with a atmospheric pressure stirring condition; and (2) filtrating the slurry obtained in step (1), and adding synthetic additives and lime in the slurry for secondary desilication under the atmospheric pressure. With the method of the invention, the concentration of the Al2O3 essence solution of high-concentration sodium aluminate solution after desilication is 130-170g / L, the silicon content index of the solution is more than 850, the energy consumption for the wet system processes is reduced by more than 20 percent, the decomposition rate can reach above 90 percent by using the essence solution for continuous carbonation decomposition, and the quality of a aluminum oxide product can meet the requirements of the index of the sandy alumina.

Description

technical field [0001] The invention relates to a desiliconization method of a high-concentration sodium aluminate solution, which relates to a desilication method of a high-concentration sodium aluminate solution obtained in the process of producing alumina by adopting an intensified sintering method. Background technique [0002] Crude liquid Al after clinker dissolution in the traditional sintering alumina production process 2 o 3 The concentration is generally controlled at 110-125g / L, in which SiO 2 The concentration is about 4.5g / L, and the silicon content index of sodium aluminate solution after desiliconization by traditional pressurized desiliconization process and normal pressure desiliconization process can reach more than 600, which can meet the requirements of carbonation and decomposition of alumina produced by sintering method Require. However, with the development of alumina production technology, the high A / S clinker sintering technology and high alumina ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 杨桂丽杨志民娄世彬
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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