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Method for preparing mullite powder from fly ash

A technology for mullite powder and fly ash is applied in the field of preparing mullite powder to achieve significant economic and social benefits.

Inactive Publication Date: 2012-11-07
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

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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 from fly ash, and relates to a method for preparing high-purity superfine mullite. According to the method, the fly ash is taken as a main raw material, an appropriate amount of Al2O3 is added, a planetary ball mill is adopted, and the operating parameters of the mill are that revolution speed is 250r / min, rotation speed is 200r / min, and the weight ratio of a ball to the material is 20:1. The method comprises the following steps of: putting the dried fly ash and aluminum hydroxide into a ball milling tank in a stoichiometric ratio according to the composition of the mullite, adding 0.1 to 0.15ml of triethanolamine serving as a grinding aid into each 100g of material, grinding for a certain period of time, and sampling; and calcining at different temperatures to obtain the mullite powder, washing by using hydrofluoric acid, and filtering to obtain high-purity superfine mullite powder. The method has the advantages that a new way is opened up for the high value-added utilization of the fly ash, and obvious economic and social benefits are achieved.

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 Applications(China)
IPC IPC(8): C04B35/632C04B35/185
Inventor 张雷陈群玉孙美侠
Owner XUZHOU COLLEGE OF INDAL TECH