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Method for decalcifying aluminum chloride solution and method for extracting alumina from fly ash

A technology of aluminum chloride and solution, applied in the field of purification, can solve the problem of low calcium ion removal rate and achieve the effect of shortening the operation process

Active Publication Date: 2016-08-17
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a method for decalcifying aluminum chloride solution and a method for extracting alumina from fly ash, so as to solve the problem of low removal rate of calcium ions in aluminum chloride solution in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 10Kg of fly ash was added to hydrochloric acid, and after stirring and reacting, an aluminum chloride slurry with a calcium ion concentration of 1.8g / L, a solid content of 40g / L and a pH of 1.5 was formed;

[0034] At a temperature of 55°C, Na was added to the above aluminum chloride slurry 2 SO 4 and polyaluminum sulfate, so that Na 2 SO 4 Medium SO 4 2- The molar ratio of ions to calcium ions in the slurry is 1.4:1, and the polyaluminum sulfate is 1.8wt‰ of the total weight of solids in the slurry. After stirring for 10 minutes, filter with a plate and frame filter press to obtain decalcified aluminum chloride solution .

Embodiment 2

[0036] 10Kg of fly ash was added to hydrochloric acid, and after stirring and reacting, an aluminum chloride slurry with a calcium ion concentration of 1.8g / L, a solid content of 320g / L and a pH of 3 was formed;

[0037] At a temperature of 85°C, add Na to the above aluminum chloride slurry 2 SO 4 and polyaluminum sulfate, so that Na 2 SO 4 Medium SO 4 2- The molar ratio of ions to calcium ions in the slurry is 1.4:1, and the polyaluminum sulfate is 45wt‰ of the total weight of solids in the slurry. After stirring for 30 minutes, filter with a plate and frame filter press to obtain a decalcified aluminum chloride solution.

Embodiment 3

[0039] 10Kg of fly ash is added to hydrochloric acid, and after stirring and reacting, an aluminum chloride slurry with calcium ion concentration of 2g / L, solid content of 50g / L and pH of 1.5 is formed;

[0040] At a temperature of 60°C, add aluminum sulfate to the above-mentioned aluminum chloride slurry to make the SO in the aluminum sulfate 4 2- The molar ratio of ions to calcium ions in the slurry was 1.5:1, and stirred for 30 minutes to obtain a mixture;

[0041] Add polyacrylamide to the above mixture so that the polyacrylamide is 2wt‰ of the total weight of solids in the slurry. After stirring for 10 minutes, filter with a plate and frame filter press connected in series to obtain a decalcified aluminum chloride solution.

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PUM

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Abstract

The invention discloses a method for decalcifying aluminum chloride and a method for extracting aluminum oxide from coal ash. The method for decalcifying the aluminum chloride comprises the steps of A, supplying aluminum chloride slurry; B, adding an SO4<2-> ion supply source and a flocculating agent into the aluminum chloride slurry, performing stirring reaction, and filtering the mixture to obtain the decalcified aluminum chloride solution. SO4<2-> ions in the SO4<2-> ion supply source can be reacted with calcium ions in the slurry to form CaSO4 floccules; the flocculating agent can flocculate the CaSO4 floccules, so that the calcium ions in the aluminum chloride slurry can be removed. According to the method for directly adding the SO4<2-> ion supply source and the flocculating agent into the aluminum chloride slurry containing a certain amount of solid suspension particles, the solid suspension particles in a reaction system can achieve a certain adsorption effect on the CaSO4 floccules, and CaSO4 floccule separation is facilitated, so that the calcium ions in the aluminum chloride slurry can be better removed.

Description

technical field [0001] The invention relates to the field of purification, in particular to a method for decalcifying aluminum chloride solution and a method for extracting alumina from fly ash. Background technique [0002] Aluminum chloride solution is an important raw material for the preparation of polyaluminum chloride, crystalline aluminum chloride and alumina. The conventional preparation method of aluminum chloride solution is to use hydrochloric acid to dissolve aluminum-containing ore, fly ash or other aluminum-containing raw materials to form aluminum chloride slurry, and then filter and purify the aluminum chloride slurry to obtain aluminum chloride solution . During the preparation of aluminum chloride solution, since aluminum-containing raw materials often contain calcium element, the aluminum chloride solution often contains impurity calcium impurities, and the calcium impurities exist in a very stable ion state. [0003] In industrial production, the precip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/62C01F7/02
Inventor 郭昭华王宏宾王启瑞胡红霞周永利曹坤董宏钞晓光
Owner CHINA SHENHUA ENERGY CO LTD