A kind of zirconium-containing mullite composite phase material and preparation method thereof

Abstract

The present invention involves a Mo Lai Shi Fu -phase material and its preparation methods.Its technical solution is: mixing waste -type sand and alum soil first, the mass ratio of Al2O3: SIO2 in the raw materials is (2.6 ~ 2.8): 1; plus 40 ~ 50WT%of water and 2 ~ 4WT, plus the raw material 40 ~ 50WT%of water and 2 ~ 4WT%Of polyvinyl alcohol, a ball grinding for 5 ~ 10h; then the pulp was sprayed with granules after grinding the ball, and the machine pressure was formed.Mo Lai Shi recovered material.The AL2O3 content of abandoned sand is 30 ~ 55WT%, the SIO2 content is 35 ~ 60WT%, and the ZRO2 content is ≥4.5WT%; the particle size of the abandoned sand is ≤0.089mm.The invention has the characteristics of low production costs, small environmental pollution, and easy industrialized production.The prepared Mo Lai Shi rehabilitation materials have a lower thermal expansion coefficient and good thermal shock stability, and are widely used.

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. ...

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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 process and unfavorable for realizing industrialized production; 2. The use of fluorine-containing substances in the preparation process will cause serious pollution to the environment

"A method of producing mullite by using fly ash" (ZL201210005536.3) patented technology, which discloses a method of using fly ash as raw material, after pretreatment, desiliconization, pickling, secondary desiliconization, The method of roasting to obtain mullite. The main defects of this patented technology are: 1. A certain amount of waste water will be generated during the production process. 2. The production conditions are harsh and the cost is too high, making it difficult to realize industrial production.

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