1.high efficiency and energy saving 2.long service life 3.good after sale service 4.super quality and favourable price 1. ... , slag , gypsum, tailings , sludge , kaolin , activated carbon, coke powder and other end , Powder , waste, waste residues, are widely used in ... from the powder ball. After 30 years of concentrated research and development, basing on the original two-roll Pressure Ball machine ...