Anionic polyacrylamide because it has: 1, to clarify purification; 2, promote settlement; anionic polyacrylamide Picture 3, filtering promoted; 4, thickening effect and other effects. In wastewater treatment, sludge dewatering, mineral processing, coal washing, paper, etc., can fully meet the requirements of various fields. Coal plants to coal slurry treatment using "cyclone - concentrator - press (slime sedimentation tank)," Under normal circumstances processes. Under normal circumstances are purchasing machine polymer flocculant (polyacrylamide). Polymer flocculant and slime slime colloidal particles or contact role, and in the power of slime surface, reducing the surface energy, the agglomerated particles precipitated slime. Molecular weight polyacrylamide generally between one million, consisting of different size slime water to choose different molecular weight flocculant. PAM can be divided into anionic polyacrylamide, cationic polyacrylamide and nonionic polyacrylamide three types. Using polyacrylamide water treatment time, to ensure that the type of slime water pH match, anionic polyacrylamide suitable alkaline slurry water, cationic polyacrylamide suitable acidic slime water, anionic and cationic polyacrylamide mixed, slime water flocculation better.