... humidity of lower than 10%, such as cobbles, coke, coal, ceramics, quartz, limestone, muddy shale, chalkstone, gypsum ... can be used to produce melon stone, coal and coal gangue in building material and electricity industry with ... after sale service Working Principles:The roller crushing machine has two rollers rotating in the opposite ... -88208058 Chengdu Dahongli 75* 27 roller crushing plant