Polypropylene amide (Polyscrylamide) called PAM, commonly known as flocculants or cohesion agent, sub-cationic, anionic, the molecular weight between 400-1800 million, the product appearance is white or slightly yellow powder, soluble in water. Particularly acidic water, acid and organic matter for suspension and flocculating red mud and the mud from the liquid separation effect, with less low cost of water, flocculant can not be replaced by other products.