METHOD AND APPARATUS FOR PREPARING HIGH-PURITY CRYSTALLINE SILICA

摘要

The present disclosure provides a method and apparatus for preparing high-purity crystalline silica particles by mixing colloidal silica with an organic base to form a mixed sol. The mixed sol is heated up to a reaction temperature of about 180 degrees Celsius or above, which is held for a reaction time of about 8 to about 168 hours for a hydrothermal synthesis process in the mixed sol. A gravitational setting or a centrifugation is performed on the mixed sol to provide precipitates from the mixed sol. The precipitates are washed with deionized water to remove residual organic base. The washed precipitates are dried at about 60 to about 80 degrees Celsius and are collected and packaged to obtain high-purity crystalline silica particles.

主权项

1. A method for preparing high-purity crystalline silica particles, comprising:
mixing 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 setting 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.