Overpressure Trapezium Mill ,also cold Overpressure T-type Mill Grinder,or T-type Mil is mainly used to grind a variety of ores and chemical raw materials and other non-metallic raw materials, such as Iron ore , coal , stone , blast furnace slag , power plant desulfurization agent , boiler injection coal , lime , feldspar, quartz, gypsum, barite, limestone, ceramics, slag ,etc.Also more than 280 kinds of non-inflammable and non-explosive materials with a Moth's hardness below 9.3 scale, and a humidity below 6%, materials which used in mining, construction, chemical and metallurgy. The size of finished powder can be adjusted ranging from 80 to 425 mesh. (minimu fineness:1000 mesh ) Overpressure Trapezium Mill is able to produce coarse powder ranging from 30-80 mesh by adding special devices.