Wet coal mine coal washing wastewater processing industry tailrace, which contains a lot of slime and sediment, the coal industry is one of the major sources of pollution. Particularly stable coal washing waste water and let stand for a few months and will not natural subsidence, therefore very difficult to handle. In the washing process, both the use of water as washing medium. Coal washing water consumption, coal slime water is also generated after large (emission factor generally produce 29 tons of coal per ton of coal slurry). Weakly alkaline washing water colloidal system, the particle surface with a strong negative charge; SS CODcr concentration and high concentrations; high content of fine particles; viscosity; resistance of sludge, filtration performance is poor. At present, the actual coal washing plant for water treatment sludge is mainly used in coal washing waste water closed circulation method, Coal Slurry treatment for a "cyclone - thickener - filter (sludge sedimentation tank)" Handling processes. "Cyclone - thickener - filter" treatment process and "cyclone - thickener - slime sedimentation tanks" treatment process considerably, which deal with low cost, but requires sufficient capacity and the number of slime precipitation pool, and there is an area of ??large, winter freezes and other issues. Our treatment program is the use of coal slime water filter replacement sedimentation tank, or an increase in the return water before washing water filters, so that both can improve the recovery rate of coal, but also to improve the water quality of reclaimed water and clarifying effect. Processing using electrostatic adsorption principle washing water, the filter with a half-meter suspension within the dielectric layer. Filter medium suspension of 1-2mm pellets, the use of polymer materials processing, the density of water is about 1/10. Spherical media uniformly distributed in the filter, closely arranged, suspended solids in water absorption retention, the cake layer formed on the surface of the dielectric. With the cake layer thickens, gravity is greater than the buoyancy, the concentrated solution falling into the bottom area. Also with a pair of dipole itself, can be adsorbed into the suspension layer of fine suspended solids, and can be combined with efficient adsorption of inorganic flocculants organics in wastewater. The suspension is relatively weak binding force, can be washed down by the backwash quickly, which in turn recover adsorption capacity. Spherical Dielectric organics and oxidant pollution. Run the process need not be replaced, you can add a little each year. Filter backwash, backwash sludge using their simple operation. Fundamentally change the current status of the use of coal washing wastewater treatment. High separation efficiency, water quality and clarity (SS less than 10mg / l) is stable and reliable, low power devices, low energy consumption, low operating cost, small footprint, long life, project investment, simple process, anti- Rinse completely automatic, convenient operation and management features. BRIEF: electrostatic adsorption filter washing effect of water