Abstract: Introduce the technical principle of heavy medium shallow groove separator.There were lots of problems in Pansan coal preparation plant.The circulating pump for qualified medium was too large,the rising flow process was imperfect and difficult to stably control,the layout of shallow groove pipelines was unreasonable,the lift was high,the circulating medium pump working point deviated from the maximum efficiency zone and the like.To resolve these problems,add a discharge pipe to the rising flow pipe,adjust the rising flow pressure to 0.033 MPa by installing the valves and digital pressure gauge,ensure the groove coal density-dominant separation,stabilize suspension concentration,determine the front funnel upwelling pressure is 0.040 MPa,control pipe gate valve and pressure gauge to ensure that the pressure is accurate,check the status,operation and shallow groove separation machine operation continuity.After transformation,avoid the clean coal mixing in gangue,increase the clean coal yield,the rising flow can be manually non-polar regulated,decrease the separation density and dosage of magnetite powder,the profits increase by 3×106 yuan every month.