... and any shape can be custom-made; 2, Turn-key production line service. Coal Dust, Ball Press Machine, OEM Manufacturer in China ... ball, such as coal dust, aluminum powder, active carbon, aluminum oxide, bauxite, causticity sodium, charcoal, clay ,braize ,coal, cryolite, chemical ... become larger, When the material to the two rollers rotating line contact point, the pressure of materials has reached the ...