... , calcite, potash feldspar, talcum, marble, limestone,Raymond mill, ceram and slag below scale 7 of Moth’s ... . Due to the centrifugal force in rotation, the roller swings outward and presses closely upon the ring. The ... the stuff to the space between the roller and ring. When the roller rolls, the stuff is thus grinded. ... , any modification shall not be advised additionally. vertical type raymond mill