In the building materials industry, PAM can be used as paint thickener dispersant, sawing stone plate coolant and ceramic adhesive; in agriculture, PAM super absorbent material can be used as a soil and seed culture humectant agents. In the construction industry, PAM can enhance the hardness of gypsum cement, asbestos cement accelerate dehydration speed. In addition, PAM also be used as a natural or synthetic leather protective coatings and inorganic fertilizer granulation additives. Put principles: 1, granular polyacrylamide flocculant is added to the sewage can not be directly cast. It must first be dissolved in water before use, with its solution to deal with sewage. 2, dissolving particulate polymer should be clean water (e.g. tap water), not sewage. Room temperature water can, generally does not require heating. When the water temperature is below 5 ℃ dissolve very slowly. Raise the water temperature to dissolve faster, but more than 40 ℃ will accelerate the degradation of polymers, affect the results. Water is generally suitable for the preparation of polymer solution. Acid, alkali, high salinity of the water is not suitable for the preparation. 3, the choice of the concentration of the polymer solution, 0.1% -0.3% recommended, i.e. 1 liter of water was added 0.1g-0.3g polymer powder.