... 2, easy to maintain 3, long service life 4, ISO 9001:2000Application of the Drum Filter of External Filtration:The drum ... oredressing,metallurgy,chemical industry, and papermaking.It is mainly specilized in dehydrating for clean coal ,nonferrous metal ... concentrate(copper,zinc,aluminium,and nickel..),and nonmetal concentrate(sulphur,phosphorus,talc,and fluorite ...