Zirconium-containing mullite composite phase material and preparation method thereof

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. ...

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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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