... impurities such as Fe2O3,CaO,MgO,Al2O3. The high-quality diatomite appears white, with Sio2 content over 70 ... structure endows them many excellent and unique functions: high pore volume, large specific surface, small specific ... , road construction, fertilizer, s of heat preservation product for building material and it can also used as ... request.6)photo: factory price---high quality diatomite product