Several methods for preparing spherical silica powder are presented and analyzed.

Kinetics of methane hydrate formation in mixture of ice powders and sand;

Study on technologic condition of sand in immobilized biological activated carbon purification technology;

Study on function correlation between long-fiber filtering and sand filtering;

Improvement of quartz sand filtration of polluted NHD solution;

Improvement of quartz sand filtration process for vinegar treatment;

Study on surface modification of quartz sand with iron oxide;