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Method for preparing microcrystalline mullite from fly ash

A technology of microcrystalline mullite and fly ash, which is applied in the field of resource utilization of solid waste, can solve problems such as waste of aluminum resources, and achieve the effect of reducing energy consumption

Inactive Publication Date: 2014-04-09
INNER MONGOLIA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects in the prior art that additional aluminum-containing additives are added in the production process of mullite, resulting in the waste of aluminum resources, and to provide a method that does not need to add aluminum-containing additives, and uses fly ash to undergo alkali-dissolution desiliconization and Process for preparing microcrystalline mullite powder by deep iron removal

Method used

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  • Method for preparing microcrystalline mullite from fly ash
  • Method for preparing microcrystalline mullite from fly ash
  • Method for preparing microcrystalline mullite from fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Iron removal: Mix raw materials with water at a ratio of 1:5. Put the above slurry into a wet iron removal device and remove iron twice under a 10000 Gauss 30HZ magnetic field;

[0038] (2) Desiliconization: mix the fly ash slurry after iron removal with 15% sodium hydroxide according to the mass ratio of ash to alkali (fly ash / sodium hydroxide) 1:0.6, put it into an autoclave, and heat it at 95 °C for 1 hour.

[0039] (3) Deep iron removal: Mix the above-mentioned filtered powder with 18% hydrochloric acid according to the liquid-solid ratio of 5:1, and react at 95°C for 4 hours under the protection of the reflux device.

[0040] (4) Separation and water washing: the reacted powder was separated from the solution by suction filtration, and washed repeatedly with water until the pH value of the solution was 7. And dry the above powder at 100°C for 2 hours.

[0041] (5) High-temperature treatment: calcining the above-mentioned treated powder at 1250°C for 2 hours ...

Embodiment 2

[0043] (1) Iron removal: Mix raw materials with water at a ratio of 1:2. Put the above slurry into the wet iron removal device and remove iron once under the magnetic field of 130000Gusset and 30HZ;

[0044] (2) Desiliconization: Mix the fly ash slurry after iron removal with a sodium hydroxide solution with a mass concentration of 20% according to the mass ratio of ash to alkali (fly ash / sodium hydroxide) 1:0.4, and put it into an autoclave , reacted at 100°C for 2.5 hours.

[0045] (3) Deep iron removal: Mix the above-mentioned filtered powder with 30% sulfuric acid at a liquid-solid ratio of 2:1, and react at 95°C for 4 hours under the protection of the reflux device.

[0046] (4) Separation and water washing: the reacted powder was separated from the solution by suction filtration, and washed repeatedly with water until the pH value of the solution was 7. And dry the above powder at 120°C.

[0047](5) High temperature treatment: calcining the above-mentioned treated pow...

Embodiment 3

[0049] (1) Iron removal: Mix raw materials with water at a ratio of 1:5. Put the above slurry into the wet iron removal device and remove iron for 3 times under 10000Gusset, 30HZ magnetic field;

[0050] (2) Desiliconization: Mix the fly ash slurry after iron removal with a sodium hydroxide solution with a mass concentration of 30% according to the mass ratio of ash to alkali (fly ash / sodium hydroxide) 1:0.3, and put it into an autoclave Desiliconization was carried out, and the reaction was carried out at 95° C. for 3 hours.

[0051] (3) Deep iron removal: Mix the above-mentioned filtered powder with 20% nitric acid according to the liquid-solid ratio of 3:1, and react at 95°C for 1 hour under the protection of the reflux device.

[0052] (4) Separation and water washing: the reacted powder was separated from the solution by suction filtration, and washed repeatedly with water until the pH value of the solution was 7. And dry the above powder at 110°C.

[0053] (5) High te...

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Abstract

The invention relates to a method for preparing microcrystalline mullite from fly ash. The method comprises the following steps of a, preparation of fly ash as a raw material, b, iron removal: mixing the raw material and water according to a weight ratio of 1: 2 to 1: 20, putting the mixed slurry into a wet iron-removal device and carrying out iron removal in a magnetic field, c, silicon removal: mixing the fly ash without iron and sodium hydroxide, putting the mixture into an autoclave and carrying out silicon removal, d, deep iron removal: mixing the filtered powder and hydrochloric acid / sulfuric acid or nitric acid and carrying out deep iron removal, e, separation and water washing: carrying out filtration separation on the reacted powder and solution, carrying out repeated washing by water and drying the washed powder, and f, high-temperature treatment: calcining the dried powder at a high temperature for 2-4h to obtain the microcrystalline mullite powder product. The microcrystalline mullite utilizes fly ash as the raw material. The method is free of traditional use of an aluminum- or silicon-containing additive for rectification of raw material chemical composition, maximally utilizes a mullite crystal phase formed in fly ash high-temperature heating and greatly reduces energy consumption in crystallization.

Description

technical field [0001] The invention relates to a production process of mullite, in particular to a method for preparing microcrystalline mullite by using fly ash, and belongs to the fields of powder preparation technology and solid waste resource utilization. Background technique [0002] Mullite is an important basic raw material for high-temperature industry. Its traditional production process uses natural bauxite and kaolin or industrial alumina and clay to sinter at high temperature, so it consumes a lot of aluminum resources and energy. Bauxite is mainly used for the production of alumina. Due to the shortage of bauxite resources in my country, in order to ensure the safety of aluminum industry resources, the country has issued relevant policies to gradually restrict the mining of bauxite to produce high-alumina refractory materials. The fly ash formed by burning coal has formed a large number of mullite microcrystals under the high-temperature thermodynamic conditions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26
Inventor 孙俊民张永锋郜俊单玉海张印民张建民
Owner INNER MONGOLIA UNIV OF TECH
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