Polypropylene amide (Polyscrylamide) called PAM, commonly known as flocculants or cohesion agent, sub-cationic, anionic, the molecular weight between 400-1800 million, product appearance of white or slightly yellow powder, colorless viscous liquid colloidal , soluble in water temperature exceeds 120 ℃, decomposition. Polypropylene amide molecule has a positive gene (-CONH2), can decompose in solution with adsorption and driving suspended bridge, there is a strong flocculation, it is widely used in water treatment and metallurgy, paper, petroleum, chemical, textiles, mineral processing and other fields. Polypropylene amide into: cationic, anionic and nonionic. Polyacrylamide use features a) flocculation: PAM suspended material can call in and through, bridging adsorption, flocculation effect. 2) adhesion: through mechanical, physical, chemical action, from the bonding effect. 3) reduction in resistance: PAM can effectively reduce the fluid friction, water trace PAM can drop 50-80%. 4) Thickening: PAM in neutral and acid conditions are thickening effect, when the PH value of 10 or more easily hydrolyzed PAM. Semi-mesh structure, thickening more apparent. Role of PAM Principle 1) flocculation principle: PAM used for flocculation, and the surface properties floc species, especially dynamic potential, viscosity, turbidity, and the PH value of the suspension, the particle surface zeta potential, particle inhibitor reason to join the opposite surface charge PAM, make dynamic potential decrease cohesion. 2) adsorption bridging: PAM chains fixed to the surface of the particles of different, each particle is formed between the polymer bridges, the particles form aggregates of settlement. 3) Surface: PAM polar groups on the molecules of the various adsorption particles. 4) enhancement: PAM chain and scattered through a variety of mechanical, physical, chemical and other effects, the dispersed phase implicated together to form a network, which in turn has enhanced role.