Flip-flow screen dry fine coal removal dense medium separation method of lump coal before feed for washing

The invention relates to a flip-flow screen dry fine coal removal dense medium separation method of lump coal before feed for washing. After raw coal is classified through a phi 13 mm flip-flow screen, pulverized coal with a particle size of being less than 13 mm enters a pulverized coal cabin or a pulverized coal washing system. The lump coal with the particle size of being greater than 13 mm enters the phi 13 mm lump coal flip-flow screen to remove fine coal, an oversize after fine coal removal of the lump coal flip-flow screen enters a dense medium shallow groove sorter, and undersize enters the pulverized coal cabin; after a dense medium shallow groove separator overflow is dehydrated and medium-removed by a wash lump medium removal screen, the overflow enters a phi 25 mm wash lump classification screen to be classified into small wash lumps and big wash lumps; an underflow of the dense medium shallow groove separator is dehydrated and medium-removed by a waste rock medium removal screen to form blocky waste rock; the undersize of the medium removal screen is divided into two parts; after an after-screen section enters a composite medium bucket for continuous use and an before-screen section enters a rare medium bucket, the medium is pumped into a magnetic separator to recover the medium; tailings of the magnetic separator enter a slime water treatment system. The slime content produced by lump coal washing is reduced, the product recovery rate is improved and the lump coal product undersize fraction is reduced.