High-purity superfine silicon dioxide for honeycomb ceramic carrier and preparation method of high-purity superfine silicon dioxide

Abstract

The invention discloses high-purity superfine silicon dioxide for a honeycomb ceramic carrier and a preparation method of the high-purity superfine silicon dioxide. The particle size distribution of the silicon dioxide is as follows: greater than or equal to 35.0% of silicon dioxide with the particle size of 1 [mu]m, the D10 is less than or equal to 0.5 [mu]m, the D50 is 1.0-1.5 [mu]m, the D90 is less than or equal to 5.0 [mu]m, the D100 is less than or equal to 10.0 [mu]m, and the purity of SiO2 is greater than or equal to 99.9%; the content of magnetic impurities is less than or equal to 15 ppm, and the water content is less than or equal to 0.1%; the method comprises the following steps: selecting a high-purity crystal raw material with the SiO2 content of more than or equal to 99.7% and the magnetic impurity content of less than or equal to 15ppm, and crushing, screening, removing iron, grinding and settling the raw materials; collecting the supernatant slurry, centrifuging and dewatering the slurry, dispersingthe slurry, and performing screening and deaggregation to prepare the product. By adopting the preparation method disclosed by the invention, the high-purity superfine silicon dioxide product for the honeycomb ceramic carrier meeting the national VI standard can be stably produced in batches, and the solid content in the slurry can be stably reduced to be below 5% after the production is finished.

Description

technical field [0001] The invention relates to a quartz glass tube, in particular to a high-purity ultrafine silicon dioxide for a honeycomb ceramic carrier and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, the number of cars is also growing rapidly. As of September 2020, the number of motor vehicles in the country reached 365 million, including 275 million cars. At present, the largest source of air pollution in the urban environment comes from the exhaust of automobiles. The exhaust particles of gasoline engines are small, the engine speed is high, and the flow rate of exhaust gas is fast. With the improvement of environmental protection requirements, higher requirements are put forward for the specific surface area, porosity, average pore size, stability and other properties of the honeycomb ceramic carrier used in gasoline engines. [0003] With the implementation of higher national VI emission standard...

AI Technical Summary

Problems solved by technology

Compared with the wet process, it has the advantages of high grinding efficiency and large production capacity, and can meet the particle size requirements of ultrafine silica powder by direct grinding, and there is no problem of slurry treatment. However, the traditional dry process uses alumina material As the lining and grinding medium of grinding equipment, the silica powder product SiO produced by dry process 2 The purity is low, unable to reach more than 99.9%

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