Factors PAM viscosity polypropylene viscosity of the aqueous solution reflects mainly a result of internal friction between molecules of the liquid flow generated by the movement or relative. Friction within the structure of the polymer, the nature of the solvent, solution concentration and temperature and pressure and other factors, the greater its value, indicating that the greater the viscosity of the solution. 1, the temperature on the viscosity of the polyacrylamide temperature random thermal motion of molecules reflects the intensity of molecular motion must overcome the interaction between molecules, and interactions between molecules, such as intermolecular hydrogen bonds, internal friction, diffusion, molecular chain orientation, entanglement, etc., directly affect the size of the viscosity, it is the viscosity of the polymer solution will vary with temperature. Effect of temperature changes on the polymer solution viscosity is significant. The viscosity of polyacrylamide solution decreases with increasing temperature, the reason is dispersed particle entangled polymer solution with each other to form a network structure of the polymer, when higher the temperature, the more easy to destroy the network structure, so its viscosity decreases . 2. Effect of hydrolysis time on the viscosity of the polyacrylamide solution viscosity of polyacrylamide hydrolysis over extended time change, the hydrolysis time is short, a small viscosity, which may be due to polymer had a chance to form a network structure due; hydrolysis time too long, viscosity decreases, which is due to release polyacrylamide structure in solution. Partially hydrolyzed polyacrylamide dissolved in water dissociate into negatively charged molecules, anion repulsion electrostatic repulsion between the molecules and the different links on the same molecule causes the molecule extending between the solution and enable entanglement between molecules This is partially hydrolyzed polyacrylamide solution viscosity can make it obvious reasons for the increase. 3, the impact of salinity on polyacrylamide viscosity cationic polyacrylamide molecular chain groups with respect to the larger number of anionic groups, net charge more polar, while H20 is a polar molecule, according to the similar phase soluble principle, a water-soluble polymer is preferably, intrinsic viscosity greater; mineral content increases, the positive electrostatic charge portion is surrounded by an anion to form an ion atmosphere, thereby binding with the surrounding positive electrostatic charge, the polarity of the polymer solution Save small, viscosity decreases; mineral concentrations continued to increase, the positive and the negative groups form intramolecular or intermolecular association by hydrogen bonds (resulting in decrease in water solubility of the polymer), while salts added positive ions by shielding, negative charge, positive break, salt bond between the leaving anion association has been formed is destroyed (leading to an increase in solubility of the polymer in water), these two competing effects, so that the polymer solution at a high concentration ( > 0.06 mol / L) is kept small viscosity. 4, viscosity molecular weight polyacrylamide impact on the viscosity of the solution polyacrylamide polymer with a molecular weight increases, the viscosity of the polymer solution which is produced by the interaction between the motion of molecules and molecules. When the polymer molecular weight of about 106, polymer coils begin to penetrate each other enough to affect light scattering. When the content is slightly higher mechanical entanglement enough to affect viscosity. When the content is relatively low, the polymer solution can be regarded as a network structure, mechanical entanglement and hydrogen bonding between chains together form a network node. When higher levels, a solution containing many chain - link contacts to make the polymer solution was gelled. Thus, the greater the relative molecular mass of the polymer, the more easy to form intermolecular chain entanglement, the greater the viscosity of the solution. Dosage, dosage is determined polypropylene amide To the solution is clear as the standard, appropriate to add, too, not only ineffective, and the resulting increase in consumption, while the effect of leaf filter capacity. A liquid preparation of polyacrylamide concentration should not be too high, too high alkaline uneven mixing polyacrylamide, polyacrylamide hydrolysis reaction is not sufficient, the impact of flocculation. PAM dosage is mainly based on how much the amount of red mud and sedimentation may be, the appropriate amount of red mud will increase the amount of polyacrylamide, but a greater impact on the way the preparation of polyacrylamide sedimentation, using reasonable formulate ways to improve settling effect, but also greatly reduce the consumption of polyacrylamide, help to improve capacity settlement system.