1.the raw material is drying powder 2. don't allow add any binder in pressing process 3.Spiral pressure Press machine (for caustic lime,magnesium,bronze dust)Our dry powder ball press machineis widely used,which can produce various briquettes of materials and powders, including lime powder,cryolite,alumina,fertilizer,powdered mangnesium,bauxite,aluminum ash,powder of nonferrous metal, ...