Zirconium-containing mullite composite phase material and preparation method thereof

A technology of zirconium-mullite and raw materials, which is applied in the field of zirconium-containing mullite composite materials and its preparation, can solve the problems of unfavorable industrial production, high cost, and complicated production process, so as to facilitate industrial production, improve the use effect, The effect of simple production process

Active Publication Date: 2015-01-07
WUHAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] "A mullite lightweight heat-insulating brick based on waste molding sand and its preparation method" (ZL201210105340.1) patented technology, which uses precision casting waste sand as the main raw material to prepare mullite light-weight heat-insulating bricks, because of its Limited application range, which affects the recycling rate of waste molding sand
"A method for preparing mullite powder using fly ash as raw material" (ZL201210255167.3) patented technology and "Method for preparing mullite from modified kaolin at low temperature" (ZL201210104659.2) patented technology, the above two patented technologies The main defects are: 1. High production cost, complex production proce

Method used

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  • Zirconium-containing mullite composite phase material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0019] A zirconium-containing mullite composite phase material and a preparation method thereof. First mix waste molding sand and bauxite as raw materials, and the Al in the raw materials 2 o 3 : SiO 2 The mass ratio is (2.6~2.8)︰1; add 40~45wt% water and 2~3wt% polyvinyl alcohol of the raw materials, and ball mill for 8~10h; then the ball milled slurry is spray granulated, machine pressed Molding, the molded green body is kept at 1600~1650°C for 3~4 hours, and cooled naturally to obtain the zirconium-containing mullite composite material.

[0020] In the present embodiment: the Al of the waste molding sand 2 o 3 Content 30~32wt%, SiO 2 Content 58~60wt%, ZrO 2 Content 5.8 ~ 6.1wt%; Al of the bauxite 2 o 3 Content 80~83wt%, SiO 2 The content is 11~13wt%; the pressure of machine pressing is 70~80MPa.

[0021] The zirconium-containing mullite composite material prepared in this example is analyzed by X-ray diffraction: the main crystal phase is mullite; the secondary ...

Embodiment 2

[0023] A zirconium-containing mullite composite phase material and a preparation method thereof. First mix waste molding sand and bauxite as raw materials, and the Al in the raw materials 2 o 3 : SiO 2 The mass ratio is (2.6~2.8)︰1; add 45~50wt% water and 2~3wt% polyvinyl alcohol of the raw materials, and ball mill for 8~10h; then the ball milled slurry is spray granulated, machine pressed Molding, the formed green body is kept at 1600~1650°C for 4~5 hours, and cooled naturally to obtain the zirconium-containing mullite composite material.

[0024] In the present embodiment: the Al of the waste molding sand 2 o 3 Content 32~35wt%, SiO 2 Content 55~58wt%, ZrO 2 Content 5.8 ~ 6wt%; Al of the bauxite 2 o 3 Content 80~82wt%, SiO 2 The content is 10~13wt%; the pressure of machine pressing is 60~70MPa.

[0025] The zirconium-containing mullite composite material prepared in this example is analyzed by X-ray diffraction: the main crystal phase is mullite; the secondary cr...

Embodiment 3

[0027] A zirconium-containing mullite composite phase material and a preparation method thereof. First mix waste molding sand and bauxite as raw materials, and the Al in the raw materials 2 o 3 : SiO 2 The mass ratio is (2.6~2.8)︰1; add 45~50wt% water and 3~4wt% polyvinyl alcohol of the raw materials, and ball mill for 7~9h; then the slurry after ball milling is spray granulated, machine pressed Molding, the molded green body is kept at 1650~1700°C for 3~4 hours, and cooled naturally to obtain the zirconium-containing mullite composite material.

[0028] In the present embodiment: the Al of the waste molding sand 2 o 3 Content 35~38wt%, SiO 2 Content 52~55wt%, ZrO 2 Content 6~6.3wt%; The Al of described bauxite 2 o3 Content 78~80wt%, SiO 2 The content is 13~15wt%; the pressure of machine pressing is 80~90MPa.

[0029] The zirconium-containing mullite composite material prepared in this example is analyzed by X-ray diffraction: the main crystal phase is mullite, and ...

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Abstract

The invention relates to a zirconium-containing mullite composite phase material and a preparation method thereof. The invention adopts the technical scheme that the preparation method comprises the following steps: firstly, mixing waste molding sand and alumina as raw materials, further adding water which accounts for 40-50wt% of the raw materials and polyving alcohol which accounts for 2-4wt% of water, performing spray granulation and mechanical pressing on the ball-milled slurry, keeping the temperature of formed blanks for 3-5 hours at 1600-1700 DEG C, and naturally cooling, so as to obtain the zirconium-containing mullite composite phase material, wherein the mass ratio of Al2O3 to SiO2 in the raw materials is (2.6-2.8):1. The content of Al2O3 in the waste molding sand is 30-55wt%, the content of SiO2 in the waste molding sand is 35-60wt%, the content of ZrO2 in the in the waste molding sand is greater than or equal to 4.5wt%, and the particle size of the waste molding sand is less than or equal to 0.089mm. The preparation method has the characteristics that the production cost is low, the environment pollution is small and the industrialization production is easy. The zirconium-containing mullite composite phase material prepared by using the method is relatively low in thermal expansion coefficient and good thermal shock resistance and is wide in application range.

Description

technical field [0001] The invention belongs to the technical field of mullite materials. It specifically relates to a zirconium-containing mullite composite phase material and a preparation method thereof. Background technique [0002] my country is the second largest precision casting base in Asia after Japan, with an annual production capacity of more than 500,000 tons. On average, 1.2 tons of waste sand will be produced for every ton of qualified castings produced. tons of waste sand. At present, there are relatively few researches on the comprehensive utilization and industrialization of investment casting waste sand in my country. The main way to deal with waste sand is landfill, which will not only occupy the site but also pollute the environment. [0003] Mullite is Al 2 o 3 --SiO 2 The only stable binary compound in the aluminum-silicon system has many advantages such as high refractoriness, small thermal expansion coefficient, and strong electrical insulation. ...

Claims

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Application Information

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IPC IPC(8): C04B35/185C04B35/622C04B35/66
CPCC04B35/185C04B35/622C04B35/66C04B2235/3217C04B2235/3418
Inventor 李远兵向若飞徐娜娜李淑静刘芳李亚伟桑绍柏
Owner WUHAN UNIV OF SCI & TECH
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