... . National dust-dump standard. The raymond roller mills/raymond grinder mill are mainly used in grinding more than 280 noninflammable and ... a Moth's hardness below 7 scale, a humidity below 6%, such as barite, calcite, potash, pencil stone, marble, limestone, ceramic ... in mining, construction, chemical and metallurgy. Feature Of R Pendulum Mill: 1. High capacity. 2. Wide size range of final product ...