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Method for preparing mullite powder from fly ash

A technology of mullite powder and fly ash, which is applied in the field of preparing mullite powder, and achieves significant economic and social benefits

Inactive Publication Date: 2014-08-06
XUZHOU COLLEGE OF INDAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a method for preparing ultrafine high-purity mullite using fly ash as a raw material, which can effectively use fly ash as a raw material to complete the waste of fly ash. The high value-added utilization of waste, the solution to the problem of waste discharge pollution and resource utilization, the device has the advantages of theoretical feasibility, reasonable technology, easy implementation, low operating cost, high product output efficiency; while reducing environmental load, it makes it Become an indispensable raw material for the preparation of high-performance materials

Method used

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  • Method for preparing mullite powder from fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Using a planetary ball mill, the operating parameters of the mill are revolution speed 250r / min, rotation speed 200r / min, ball to material weight ratio 20:1; the dried fly ash (Si0 2 56%, AL 2 o 3 32%, other 12%) and Al2O3 (analytical pure) according to the weight ratio of 1:1.11 into the ball mill tank, with triethanolamine as the grinding aid, add 0.1ml of triethanolamine per 100g of material, grind for 10h and then sample . The ground powder is pressed into a disc with a diameter of 10 mm and a thickness of 1 mm by a tableting device; calcined at 1250 ° C for 2 hours, and the mullite powder is washed with 10% volume concentration of hydrofluoric acid for 2 hours, and then passed Filter with filter paper; wash and filter the mullite powder with distilled water for 2 to 3 times, and air-dry to obtain a large amount of mullite powder with a particle size of less than 1um and a purity of 96.7%.

Embodiment 2

[0031] Using a planetary ball mill, the operating parameters of the mill are revolution speed 250r / min, rotation speed 200r / min, ball to material weight ratio 20:1; the dried fly ash (Si0 2 56%, AL 2 o3 32%, other 12%) and Al2O3 (analytical pure) in a weight ratio of 1:1.11 into the ball mill tank, with the composition of mullite (3Al 2 o 3 ˉ2SiO 2 ) into the ball mill tank according to the stoichiometric amount, with triethanolamine as the grinding aid, 0.15ml of triethanolamine was added to every 100g of material, and samples were taken after grinding for 20 hours. The ground powder is pressed into a disc with a diameter of 10 mm and a thickness of 1 mm by a tableting device, calcined at 1250 ° C, and the mullite powder is washed with 10% volume concentration of hydrofluoric acid for 2 hours, and then filtered through filter paper ; Rinse and filter the mullite powder with distilled water for 2 to 3 times, and air-dry to obtain a large amount of mullite with a particle si...

Embodiment 3

[0033] Using a planetary ball mill, the operating parameters of the mill are revolution speed 250r / min, rotation speed 200r / min, ball to material weight ratio 20:1; the dried fly ash (Si0 2 52%, AL 2 o 3 27%, other 21%) and Al2O3 (analytical pure) were put into the ball mill tank according to the weight ratio of 1:1.06, and triethanolamine was used as grinding aid, and 0.1ml of triethanolamine was added to every 100g of material, and samples were taken after grinding for 30 hours. The ground powder is pressed into a disc with a diameter of 10 mm and a thickness of 1 mm by a tableting device, calcined at 1250 ° C, and the mullite powder is washed with 10% volume concentration of hydrofluoric acid for 2 hours, and then filtered through filter paper ; Rinse and filter the mullite powder with distilled water for 2 to 3 times, and air-dry to obtain a large amount of mullite with a particle size of less than 1um and a purity of 96.9%.

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Abstract

The invention discloses a method for preparing mullite powder by using fly ash as a raw material, and relates to a method for preparing high-purity ultrafine mullite. The method uses fly ash as the main raw material, and then adds an appropriate amount of Al2O3, and adopts a planetary ball mill. Fly ash and aluminum hydroxide are stoichiometrically loaded into a ball mill tank based on the composition of mullite, and triethanolamine is used as a grinding aid, and 0.1-0.15ml of triethanolamine is added to every 100g of material, and samples are taken after grinding for a certain period of time . Calcining at different temperatures, mullite powder is obtained after calcining, washed with hydrofluoric acid and filtered to obtain high-purity ultrafine mullite powder. Advantages: It opens up a new way for the high value-added utilization of fly ash, and has significant economic and social benefits.

Description

technical field [0001] The invention relates to a method for preparing high-purity ultrafine mullite, in particular to a method for preparing mullite powder by using fly ash as a raw material. Background technique [0002] At present, the comprehensive utilization rate of fly ash in my country is 25-30%, most of which are concentrated in the construction and building materials industry. [0003] Mullite is A1 2 0 3 -SiO 2 It is the only crystalline compound that exists stably in the system under normal pressure. Mullite is not a strict standard measurement in terms of its composition, but a composition range whose average structure is given by [A10 6 ] octahedron and [Al0 4 ], [Si0 4 ] Tetrahedral structural elements are arranged according to certain rules in space, where [AlO 6 ] octahedrons share edges to form a chain parallel to the C axis, and at Z=1 / 2 of each unit cell, the octahedral chain and [A10 4 ], [Si0 4 ] Tetrahedrons are connected, and the double chain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C04B35/632C04B35/185
Inventor 张雷陈群玉孙美侠
Owner XUZHOU COLLEGE OF INDAL TECH