Method for preparing mullite and co-producing polyaluminum chloride by using high-alumina fly ash

A technology of polyaluminum chloride and high-aluminum fly ash, which is applied in the directions of aluminum chloride, chemical instruments and methods, and aluminum halide, can solve the problems of low quality of mullite products and high impurity content of sodium, potassium, calcium, and iron. Achieve zero emissions, increase bulk density, and good environmental benefits

Active Publication Date: 2017-08-08
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But what this method used is dilute acid solution and dilute alkali, and the sodium potassium calci

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  • Method for preparing mullite and co-producing polyaluminum chloride by using high-alumina fly ash

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Embodiment 1

[0079] A method for preparing mullite co-production polyaluminium chloride by utilizing high-alumina fly ash, comprising the steps of:

[0080] The high-aluminum fly ash is treated according to the process of acid activation-desilication-dilute acid solution washing, the concentration of hydrochloric acid in the acid activation section is 250g / L, the liquid-solid ratio is 5mL / g, the reaction temperature is 85°C, and the reaction time is 2h; The concentration of sodium hydroxide in the silicon section is 200g / L, the liquid-solid ratio is 6mL / g, the reaction time is 70min, and the reaction temperature is 90°C; the dilute acid solution washing section uses the first washing liquid as the reaction solution, the reaction temperature is 60°C, and the reaction time is 1h; The first liquid and the third washing liquid are used to prepare polyaluminum chloride, the liquid-solid ratio of the polymerization reaction is 12mL / g, the temperature of the polymerization reaction is 80°C, the ti...

Embodiment 2

[0083] A method for preparing mullite co-production polyaluminium chloride by utilizing high-alumina fly ash, comprising the steps of:

[0084] The high-aluminum fly ash is treated according to the process of acid activation-desilication-dilute acid solution washing, the concentration of hydrochloric acid in the acid activation section is 255g / L, the liquid-solid ratio is 4mL / g, the reaction temperature is 90°C, and the reaction time is 1h; The concentration of sodium hydroxide in the silicon section is 220g / L, the liquid-solid ratio is 5mL / g, the reaction time is 70min, and the reaction temperature is 95°C; the dilute acid solution washing section uses the first washing liquid as the reaction solution, the reaction temperature is 60°C, and the reaction time is 1h; The first liquid and the third washing liquid are used to prepare polyaluminium chloride, the liquid-solid ratio of the polymerization reaction is 11mL / g, the temperature of the polymerization reaction is 80°C, the t...

Embodiment 3

[0087] A method for preparing mullite co-production polyaluminium chloride by utilizing high-alumina fly ash, comprising the steps of:

[0088] The high-alumina fly ash is treated according to the process of acid activation-desilication-dilute acid solution washing, the concentration of hydrochloric acid in the acid activation section is 265g / L, the liquid-solid ratio is 6mL / g, the reaction temperature is 80°C, and the reaction time is 1h; The concentration of sodium hydroxide in the silicon section is 230g / L, the liquid-solid ratio is 7mL / g, the reaction time is 60min, and the reaction temperature is 92°C; the dilute acid solution washing section uses the first washing liquid as the reaction solution, the reaction temperature is 70°C, and the reaction time is 40min; The first liquid and the third washing liquid are used to prepare polyaluminum chloride, the liquid-solid ratio of the polymerization reaction is 10mL / g, the temperature of the polymerization reaction is 90°C, the ...

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Abstract

The invention provides a method for preparing mullite and co-producing polyaluminum chloride by using high-alumina fly ash. The method comprises the steps: activating the high-alumina fly ash in concentrated hydrochloric acid, carrying out liquid-solid separation, and carrying out washing, so as to obtain first washed solid and first washing liquid; subjecting the first washed solid to a desilicification reaction in a concentrated base solution, carrying out liquid-solid separation, and carrying out washing, so as to obtain second washed solid and second washing liquid; washing the second washed solid in dilute hydrochloric acid, carrying out liquid-solid separation so as to obtain third solid and third washing liquid, and washing the third solid by water, so as to obtain fourth solid and fourth washing liquid; carrying out aftertreatment on the fourth solid so as to obtain the mullite, and preparing the polyaluminum chloride from the first washing liquid and/or the third washing liquid. The mullite prepared by the method is low in impurity content, high in bulk density and low in water absorption rate, the polyaluminum chloride flocculant can be coproduced, the source of raw materials is wide, the process is simple, and the acid/base consumption is low, so that the method has good economic, social and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of solid waste, and relates to a method for preparing mullite and co-producing polyaluminum chloride by using high-alumina fly ash. Background technique [0002] High-alumina fly ash is a solid waste produced by burning high-alumina coal in thermal power plants in central Inner Mongolia and northern Shanxi. It contains a large amount of resources such as alumina and silica. Currently, the utilization rate is low, and a large amount of unused High aluminum fly ash not only pollutes the environment but also causes a huge waste of resources. [0003] Mullite (3Al 2 o 3 2SiO2 2 ) is a mineral formed by aluminosilicate at high temperature and is a high-quality refractory raw material. Mullite minerals are extremely rare in nature, and mullite is mainly artificially synthesized. The synthetic mullite is mainly divided into sintered mullite and fused mullite. Mullite aggregate is usual...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/185C01F7/56C02F1/52B09B3/00
CPCB09B3/00C01F7/56C02F1/5236C04B35/185C04B35/66
Inventor 李占兵李会泉李少鹏
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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