Method for preparing porzite powder by fly ash

A technology of mullite powder and fly ash, which is applied in the field of synthesizing high-temperature ceramic materials, can solve the problems of expensive organic raw materials, low conversion rate of mullite, and harsh synthesis conditions, so as to be beneficial to environmental protection and save minerals Resources and energy, the effect of low preparation temperature

Inactive Publication Date: 2010-02-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrofusion method is formed by melting the mixed raw materials in an electric arc. The disadvantage is that it consumes a lot of power and has strict requirements on the synthesis conditions; Glue method and mineral phase transition method (Wei Xiaohui, Sun Jialin, Sun Gengchen. Low-temperature synthesis of mullite [J]. Refractories, 2008, 42(3): 229-231)
Among them, the inorganic silica-alumina gel method and the organosilicon-alumina gel method are made of silica-alumina colloids by using inorganic and organic raw materials according to a certain chemical composition, and then calcined at high temperature. The disadvantages are high energy consumption and The organic raw materials used in the organogel process are expensive
The mineral phase transformation method is to place high-bauxite, kaolin, pyrophyllite and other natural minerals in a kiln for high-temperature calcination. The disadvantage of this method is high energy consumption. difference, resulting in low conversion rate of mullite, waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: First, put the fly ash and bauxite raw materials into a ball mill for dry grinding respectively, use alumina ball stone as the grinding medium, control the mass ratio of the ball and the raw material to be 2:1, grind for 3 hours respectively, and then After passing through a 120-mesh sieve, use permanent magnets to remove iron twice, and then use electromagnetic iron to remove iron twice to make the Fe in fly ash and bauxite 2 o 3 The content is lower than 0.5%; secondly, take the above-mentioned fly ash and bauxite after iron removal treatment and put them into alumina crucibles respectively, and place the alumina crucibles in a silicon carbide rod resistance furnace at a temperature of 5 ° C / The heating rate of min is raised to 200°C, kept for 3 hours, and taken out after natural cooling; finally, the naturally cooled fly ash and bauxite are poured into the material at a mass ratio of fly ash: bauxite = 1: 1.2 and stirred Stir evenly in the container,...

Embodiment 2

[0013] Embodiment 2: First, put the fly ash and the bauxite raw material into the ball mill for dry grinding respectively, utilize alumina ball stone as the grinding medium, control the mass ratio of the ball and the raw material to be 3: 1, and grind for 0.5h respectively, After passing through a 120-mesh sieve, permanent magnets were used to remove iron twice, and then electromagnetic iron removal was used to make Fe in fly ash and bauxite twice. 2 o 3 The content is lower than 0.5%; secondly, take the above-mentioned fly ash and bauxite after iron removal treatment and put them into alumina crucibles respectively, and place the alumina crucibles in a silicon carbide rod resistance furnace at a temperature of 5 ° C / The heating rate of min is raised to 400°C, kept for 1 hour, and taken out after natural cooling; finally, the naturally cooled fly ash and bauxite are poured into the material at a mass ratio of fly ash: bauxite = 1: 0.15 and stirred Stir evenly in the contain...

Embodiment 3

[0014] Embodiment 3: First, put the fly ash and bauxite raw materials into a ball mill for dry grinding respectively, use alumina ball stone as the grinding medium, control the mass ratio of the ball and the raw material to be 2.5:1, grind for 2 hours respectively, and then After passing through a 120-mesh sieve, use permanent magnets to remove iron twice, and then use electromagnetic iron to remove iron twice to make the Fe in fly ash and bauxite 2 o 3 The content is lower than 0.5%; secondly, take the above-mentioned fly ash and bauxite after iron removal treatment and put them into alumina crucibles respectively, and place the alumina crucibles in a silicon carbide rod resistance furnace at a temperature of 5 ° C / The heating rate of min is raised to 300°C, kept for 2 hours, and taken out after natural cooling; finally, the naturally cooled fly ash and bauxite are poured into the material at a mass ratio of fly ash: bauxite = 1:3 and stirred Stir evenly in the container, ...

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Abstract

The invention relates to a method for preparing porzite powder by fly ash. The method comprises the following steps: putting the raw materials of the fly ash and bauxite into a ball mill respectivelyand removing iron after dry milling; taking the fly ash and the bauxite after being processed by iron removing, putting into an alumina crucible respectively, putting the alumina crucible into a silicon-carbon rod resistance furnace, heating and taking out after natural cooling; and stirring the fly ash and the bauxite after being naturally cooled evenly, putting into the silicon-carbon rod resistance furnace, heating and taking out after natural cooling so as to obtain the porzite powder with different granularities and alumina contents. In the invention, the fly ash of a solid waste discharged by a coal-fired power plant is used for synthesizing porzite, which is not only beneficial to saving natural resources and lowering the production cost but also beneficial to environmental protection; the preparation temperature is low, high-temperature calcination is avoided and mineral resources and energy resources are saved; and by controlling the adding quantity of the bauxite and regulating the mixture ratio of the raw materials, porzite aggregates with different alumina contents can be synthesized.

Description

technical field [0001] The invention relates to the technical field of using solid waste to synthesize high-temperature ceramic materials, in particular to a method for preparing mullite powder by using fly ash. Background technique [0002] Mullite (3Al 2 o 3 2SiO2 2 ) is aluminum aluminoxate mineral, is Al 2 o 3 -SiO 2 The only stable crystalline compound in the system under normal pressure, it has high refractoriness, thermal shock resistance, chemical corrosion resistance, creep resistance, high softening temperature under load, good volume stability, and strong electrical insulation, etc. It is an ideal high-grade refractory material, and is widely used in metallurgy, glass, ceramics, chemistry, electric power, national defense, gas and cement industries (Chen Dong, Chen Nanchun. Research progress of mullite [J]. Mineral Resources and Geology, 2004( 2): 18-22). [0003] There are very few natural mullite minerals in nature, and industrial mullite is mainly artifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/626C04B35/185B09B3/00
Inventor 黄剑锋曹丽云李颖华吴建鹏
Owner SHAANXI UNIV OF SCI & TECH
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