Low-temperature activation method of fly ash and application thereof

A low-temperature activation, fly ash technology, used in solid waste removal, alumina/aluminum hydroxide, etc., can solve the problem of high calcination temperature

Inactive Publication Date: 2012-08-01
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the above literature, adding auxiliary agent for activation while thermally activating, although the extraction rate of alumina has increased, the calcination temperature is generally relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Fly ash activation: Take 100 g of fly ash with an alumina content of 35.3%, add 20 g of NaOH and 60 g of Na 2 CO 3 , fully stirred evenly, at 650 o C calcined for 3 h, quenched to obtain sintered clinker;

[0017] 2) Acid leaching of aluminum: add 750 mL of 18% hydrochloric acid to the sintered clinker, heat up to 100 o C was reacted for 2 h, the reactant was dissolved, and the residue was removed by filtration to obtain AlCl 3 aluminum salt solution.

[0018] The aluminum in the solution was detected by EDTA complexation-copper salt back titration method, and the dissolution rate of aluminum oxide was 92.1%.

Embodiment 2

[0020] 1) Fly ash activation: Take 100 g of fly ash with an alumina content of 35.3%, add 50 g of NaOH and 50 g of Na 2 CO 3 , fully stirred evenly, at 700 o C calcined for 2 h, quenched to obtain sintered clinker;

[0021] 2) Acid leaching of aluminum: Add 900 mL of 20% hydrochloric acid to the sintered clinker and raise the temperature to 105 o C was reacted for 2 h, the reactant was dissolved, and the residue was removed by filtration to obtain AlCl 3 aluminum salt solution.

[0022] After testing, the dissolution rate of alumina was 96.5%.

Embodiment 3

[0024] 1) Fly ash activation: Take 100 g of fly ash with an alumina content of 35.3%, add 40 g of NaOH and 30 g of Na 2 CO 3 , fully stirred evenly, at 750 o C calcined for 1 h, quenched to obtain sintered clinker;

[0025] 2) Acid leaching of aluminum: add 600 mL of 20% hydrochloric acid to the sintered clinker, heat up to 95 o C was reacted for 2 h, the reactant was dissolved, and the residue was removed by filtration to obtain AlCl 3 aluminum salt solution.

[0026] After testing, the dissolution rate of alumina was 95.3%.

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PUM

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Abstract

The invention discloses an activation method of fly ash. The method comprises the steps of adding a certain amount of Na2CO3 and NaOH mixed assistants into fly ash, calcining the mixed assistants and the fly ash at a certain temperature and then performing sharp quenching on the mixed assistants and the fly ash, so as to obtain fly ash sintered clinker with high reaction activity, and then ensuring that the fly ash sintered clinker is reacted in hydrochloric acid solution with the mass concentration being 15 to 25 percent at 80 to 120 DEG C for 1 to 3 h to exact aluminum oxide. By adopting the method, fly ash is activated under the low-temperature condition of 600 to 750 DEG C, so that the dissolution rate of aluminum oxide can reach more than 90 percent.

Description

technical field [0001] The invention relates to the comprehensive utilization of fly ash, in particular to a method for activating fly ash at low temperature, and the application of the method in the alumina extraction process. Background technique [0002] my country is a large coal-burning country, and a large amount of fly ash is produced in the process of coal combustion. In 2010, the production of fly ash in my country reached 480 million tons, and the comprehensive utilization rate was 68%. Due to the limited utilization rate, the annual discharge of fly ash is still more than 100 million tons, which has become the largest industrial solid waste in my country. one. At present, my country has stockpiled nearly 3 billion tons of fly ash, which has seriously damaged the ecology. At present, the utilization of fly ash is mainly used for construction, building materials, etc. The utilization is single and the utilization is limited. Opening up new utilization methods is th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B09B3/00
Inventor 郭彦霞王苗程芳琴杨凤玲
Owner SHANXI UNIV
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