Amphoteric polyacrylamide contains cationic and anionic groups in its molecule. It possesses the characteristics of common cationic flocculants and exhibits more excellent properties. Such flocculants can be used in a wide range of PH values, with higher water filtration capacity, lower cake moisture content, and can also be used for strong acid leaching of ores or recovering valuable metals from acidic catalysts containing metals. Amphoteric polyacrylamide is by no means a mixture of anionic and cationic polyacrylamide.
Cationic Polyacrylamide (CPAM) is formed by copolymerization of cationic monomer and acrylamide monomer. It is a water-soluble linear polymeric flocculant. It is mainly used in flocculation and sedimentation of sewage and sludge dewatering and so on.
Anionic polyacrylamide (APAM) is a water-soluble linear macromolecule flocculant formed by the copolymerization of acrylamide and acrylate. It promotes the flocculation of particles by neutralizing the charge of suspended particles, thus destabilizing the particles in water. The destabilized particles adsorb each other under the bridge action of the active gene of macromolecule polymers. Finally, larger flocs are formed.
The molecular chains of nonionic polyacrylamide product type N series contain polarity genes which can absorb solid particles suspended in water and form large flocs between particles. They can accelerate the sedimentation of particles in suspension and quicken the clarification of solution to promote the settling process. Nonionic polyacrylamide is widely used in chemical industry waste water treatment, Minerals selection treatment, particularly effective in acidic waste water treatment.
At present, domestic and foreign industrial production methods of polyacrylamide are as follows.1. Aqueous solution polymerization methodAcrylamide aqueous jujube method is the main method used in ind
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