Patent ID: 9624110
Date: 2017-04-18
CPC Classifications: B01J,C01B,C30B

Claim:
1. A method for preparing high-purity crystalline silica particles, comprising: pre-treating colloidal silica with an ion-exchange resin to purify the colloidal silica; mixing the colloidal silica with an organic base to obtain a mixed sol; heating up the mixed sol to a reaction temperature of about 180 degrees Celsius or above, and holding the reaction temperature for a hydrothermal synthesis process in the mixed sol for a reaction time of about 8 to about 168 hours; performing a gravitational settling or a centrifugation on the mixed sol to provide precipitates from the mixed sol; washing the precipitates with deionized water to remove residual organic base; drying the washed precipitates at about 60 to about 80 degrees Celsius; and collecting and packaging dried precipitates to obtain high-purity crystalline silica particles.