Abstract: In order to reduce the medium consumption of heavy medium coal washing in the second workshop of Shuiyu Coal Preparation Plant，aiming at the problems of medium removal screen and medium running of magnetic separator，the magnetic material recovery rate of magnetic separator，slime removal rate and water spraying structure of medium removal screen surface，water spraying pressure and distribu⁃ tion of weir sieve plate were studied. The test results show that when the length of the nozzle on the sieve surface of the medium removal sieve is staggered，the spray water pressure on the sieve surface is in⁃ creased，the narrow back width arc sieve plate is used，and the slime content in the feed of the magnetic separator is reduced，the medium consumption is significantly reduced，and the medium consumption is expected to be reduced to about 1.0 kg/t. While the non-technical loss has been reduced to the lowest lev⁃ el，the medium consumption can be reduced by optimizing the process parameters of the medium sieve and the magnetic separator，and the economic benefits of the plant can be improved.

Key words: product carrier, factor analysis, technical transformation