... good2,Process simple, less additional equipment , low cost, wide application 3,High precision and low leakage rate, mechanical wind valve,simple ... fine coal , regardless of grade and grading joint washed coal .3,The process is simple, additional equipment less, low cost and ... hole ,Middlings segment F13/F16 cone holeJigging area : gangue paragraph 3.3 m ²coal segment4.95m ² total of 8.25m ² Sieve type ...