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Method for preparing pseudo-boehmite by using high-alumina fly ash

A high-alumina fly ash, pseudo-boehmite technology, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, aluminate/alumina/aluminum hydroxide purification, etc. The problems of popularization and application of boehmite, high production cost, and large raw materials are used to achieve the effect of low production cost, comprehensive utilization, and pure crystal phase.

Inactive Publication Date: 2018-11-13
DATANG INT HIGH ALUMINA COAL R & D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the literature reports and patented technologies on the preparation of pseudo-boehmite, especially large-pore pseudo-boehmite, mainly use aluminum salt solution as raw material, which has problems such as high production cost and large raw material consumption, which to a certain extent It hinders the further popularization and application of pseudo-boehmite preparation technology

Method used

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  • Method for preparing pseudo-boehmite by using high-alumina fly ash
  • Method for preparing pseudo-boehmite by using high-alumina fly ash
  • Method for preparing pseudo-boehmite by using high-alumina fly ash

Examples

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Effect test

Embodiment 1

[0058] In this example, Inner Mongolia Datang high-alumina fly ash is used as a raw material to prepare pseudo-boehmite. The preparation method includes the following steps:

[0059] 1. Pretreatment

[0060] Mix high-alumina fly ash with 20% sodium hydroxide solution (mass ratio of high-alumina fly ash to sodium hydroxide is 1:0.5) in a stirred container at normal pressure for pre-desilication reaction, and control the pre- The reaction temperature of the desiliconization reaction is 85°C, and the reaction time of the pre-desilication reaction is controlled to be 3.0h;

[0061] After the pre-desiliconization reaction is completed, liquid-solid separation is carried out on the reaction system, and the filter cake is washed to obtain fly ash filter cake and desiliconization liquid.

[0062] After mixing the fly ash filter cake with soda lime to obtain a mixed material, the mixed material is placed in a rotary kiln at 1240° C., and sintered for 2.0 hours to prepare high-alumina ...

Embodiment 2

[0076] In this example, Inner Mongolia Datang high-alumina fly ash is used as a raw material to prepare pseudo-boehmite. The preparation method includes the following steps:

[0077] 1. Pretreatment

[0078] Mix high-alumina fly ash with 20% sodium hydroxide solution (mass ratio of high-alumina fly ash to sodium hydroxide is 1:0.5) in a stirred container at normal pressure for pre-desilication reaction, and control the pre- The reaction temperature of the desiliconization reaction is 85°C, and the reaction time of the pre-desilication reaction is controlled to be 3.0h;

[0079] After the pre-desiliconization reaction is completed, liquid-solid separation is carried out on the reaction system, and the filter cake is washed to obtain fly ash filter cake and desiliconization liquid.

[0080] After mixing the fly ash filter cake with soda lime to obtain a mixed material, the mixed material is placed in a rotary kiln at 1240° C., and sintered for 2.0 hours to prepare high-alumina ...

Embodiment 3

[0094] In this example, Inner Mongolia Datang high-alumina fly ash is used as a raw material to prepare pseudo-boehmite. The preparation method includes the following steps:

[0095] 1. Pretreatment

[0096] Mix high-alumina fly ash with 20% sodium hydroxide solution (mass ratio of high-alumina fly ash to sodium hydroxide is 1:0.5) in a stirred container at normal pressure for pre-desilication reaction, and control the pre- The reaction temperature of the desiliconization reaction is 85°C, and the reaction time of the pre-desilication reaction is controlled to be 3.0h;

[0097] After the pre-desiliconization reaction is completed, liquid-solid separation is carried out on the reaction system, and the filter cake is washed to obtain fly ash filter cake and desiliconization liquid.

[0098] After mixing the fly ash filter cake with soda lime to obtain a mixed material, the mixed material is placed in a rotary kiln at 1240° C., and sintered for 2.0 hours to prepare high-alumina ...

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Abstract

The invention provides a method for preparing pseudo-boehmite by using high-alumina fly ash. The method comprises the following steps: 1) pretreating the high-alumina fly ash to obtain a high-aluminafly ash clinker; 2) mixing the high-alumina fly ash clinker and a correction liquor, dissolving out to obtain a sodium aluminate solution; 3) using hydro-sodium aluminosilicate to desilicicate the sodium aluminate solution for the first time, obtaining a first desilicication solution; using calcium oxide to desilicicate the first desilicication solution for the second time, obtaining a second desilicication solution; 4) adding a pseudo-boehmite standard sample into the second desilicication solution to precipitate a seed crystal, and obtaining the pseudo-boehmite. The invention provides a novel technical method for preparing the pseudo-boehmite with high additional value by using the high-alumina fly ash, and the environment pollution pressure brought about by the fly ash is alleviated while the utilization level of the fly ash is improved.

Description

technical field [0001] The invention relates to the preparation technology of pseudo-boehmite, in particular to a method for preparing pseudo-boehmite by using high-aluminum fly ash, which belongs to the technical field of comprehensive utilization of fly ash. Background technique [0002] Fly ash is the product of clay minerals and associated minerals calcined at high temperature in coal-fired coal, and its chemical composition is mainly silicates and oxides of silicon, aluminum, iron, and calcium. According to statistics, the discharge of fly ash in 2010 exceeded 200 million tons, and it is estimated that the discharge of fly ash in 2015 will reach 580 million tons. The problems of land occupation and environmental pollution are very prominent. [0003] High aluminum fly ash refers to Al 2 o 3 The fly ash with a content of about 40% is about twice as high as the aluminum content of ordinary fly ash, which is equivalent to the aluminum content of low-grade bauxite in my ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14C01F7/04C01F7/47
CPCC01F7/04C01F7/14C01F7/47C01P2006/12C01P2006/14
Inventor 孙俊民公彦兵张廷安吕国志
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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