Method for the preparation of high-purity cristobalite

Abstract

A method for the preparation of high-purity cristobalite is provided. The method involves obtaining high-purity cristobalite by drying, calcining, and dispersing amorphous silica. In comparison with existing technologies, the beneficial effects of the present invention are as follows: 1. Amorphous silica has a large specific surface area and is rich in hydroxyl groups. Therefore, the cristobalite transformed from amorphous silica is prone to have pores. To eliminate these pores, the present invention employs a coupling agent for surface treatment followed by calcination. 2. The inventor chooses the silane coupling agent with a short chain length under the same mass, reducing the pores in cristobalite. Moreover, there is a certain reduction in calcination temperature and time. The possible reason is that the silane coupling agent decomposes at high temperatures, forming silica. Due to the small particle size of the decomposed silica, it preferentially forms nuclei, promoting the overall crystalline transformation.

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