... powder2. Coal powder, Coke powder, Lignite, etc,3. Charcoal powder, fireproof materials, Desulfurization gypsum, Dolomite, etc.Operating Principle ... rollers are moveable. Four Roller Double Pressing Briquette Press can supply higher pressure and higher density during ... 1000Constant / Hydraulic pressure 25 - 30 75 - 90 DYAN high efficiency Mine Powder Briquette Machine with advanced technology