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Anionic Polyacrylamide Action Principle
Sep 13, 2017

Anionic polyacrylamide (APAM) is water-soluble polymer, is mainly used for all kinds of industrial waste water flocculation sedimentation, precipitation clarification treatment, such as steel mill wastewater, electroplating factory wastewater, metallurgical waste water, coal washing waste water and sewage treatment, sludge dewatering, etc. It can also be used to clarify and purify drinking water. Due to its molecular chain contains a certain number of polar groups, it can through the adsorption of solid particles suspended in water, make the bridge between particles or by charge neutralization particles condensed to form large flocculate, so it can accelerate particle in the slurry settlement, there is a very significant to speed up the solution to clarify, promote such as filtering effect.

Application field

1. Select polyacrylamide to filter the tailings of coal slurry, please choose anionic polyacrylamide, non-ionic polyacrylamide, low cationic polyacrylamide.

2. Waste water of paint industry please choose anion polyacrylamide, non-ionic polyacrylamide. For the treatment of paint waste water, the traditional method is to mix and coagulate the mixed wastewater directly, the treatment effect is not ideal, the water quality is unstable, it is difficult to meet the emission standard.

3. Waste liquid biological treatment of dairy industry, choose cationic polyacrylamide for sludge treatment.

4. Electroplating effluent contains cyanide oxide treatment with anion polyacrylamide, non-ionic polyacrylamide, and low cationic polyacrylamide.

5. The tailings wastewater treatment of copper mine is treated with anionic polyacrylamide, low cationic polyacrylamide, non-ionic polyacrylamide.

Coal washing wastewater treatment scheme:

The processing technology of coal sludge water is adopted by the coal preparation plant. In general, it is a polymer flocculant (polyacrylamide). The polymer flocculant is in contact with the slime or coal clay and neutralizes the electrical properties on the surface of the coal, reducing the surface energy and condensing the particles of the coal. The molecular weight of polyacrylamide is generally in the million, and the coal sludge of different particle size should be used as flocculant of different molecular weight. Polyacrylamide can be divided into anionic polyacrylamide, cationic polyacrylamide and non-ionic polyacrylamide. At the time of using polyacrylamide for water treatment, to ensure that the type is in conformity with the slime water pH, the anionic polyacrylamide is suitable for the coal slime water, alkaline acid slurry suitable for partial of cationic polyacrylamide, mixture of anionic and cationic polyacrylamide, slurry flocculation precipitation effect is better.

Action principle

1) flocculation principle: PAM for flocculation, species with quilt wadding condensation surface properties, especially the potentiodynamic, viscosity, turbidity and PH value of slurry, zeta potential on the surface of the particles, particle polymerization is to join the cause of surface charge instead of PAM, can lower the potentiodynamic and condensation.

2) adsorption viaduct: the PAM molecular chain is fixed on different particle surfaces and the particles form a polymer bridge between the particles, so that the particles form together and settle down.

3) surface adsorption: various adsorption of polar group particles on PAM molecules.

4) enhancement: the molecular chain of PAM and the dispersed phase, through various mechanical, physical and chemical functions, will be associated with the dispersed phase to form a network.


Shandong Tongli Chemical Co.,Ltd