... materials with Mohs hardness below 9.3 and humidity below 6%, such as quartz, feldspar, calcite, talcum, barite, fluoride, Xircom, cinder ... that improve the classifying efficiency and precision.6. non-resistance inlet shell: Traditional observation door of shell protrude that makes the inner surface ... .045Fineness can reach to 0.0381.6-0.045Fineness can reach to 0.0381.6-0.045Fineness can reach to 0. ...