Anionic polyacrylamide promotes particle flocculation by neutralizing the charges on the surface of suspended particles in water, thereby destabilizing the particles in the water. The destabilized particles adsorb each other under the bridging effect of the active genes of the polymer polymer, and then form larger of clumps.
How to use anionic polyacrylamide
1. When using the flocculant, it can be formulated into an aqueous solution with a concentration of 0.01%-0.05%. It is better to use neutral water without salts and impurities.
2. When using flocculant, sprinkle the flocculant product evenly into the stirring water, and control the stirring speed at 100-300rpm. Appropriate heating (<60℃) can accelerate dissolution.
3. Adjust the pH value of the liquid to be treated so that the flocculant product can fully exert its effect, and select the appropriate pH value and product dosage through experiments.
4. When adding the flocculant product solution, the mixing with the liquid to be treated should be accelerated. When flocs appear, the stirring speed can be slowed down to facilitate the growth of flocs and accelerate settlement.
Precautions for anionic polyacrylamide
1. Dissolution temperature. Dissolution requires a certain temperature to speed up the dissolution. However, if the temperature is too high, the molecular chain of the polymer will break, thereby reducing the use effect. The more suitable dissolution temperature is 50℃-60℃.
2. Stirring conditions. Dissolution should avoid excessive shear force stirring. Excessive stirring will cause the molecular weight to break, thereby reducing the use effect. Low-speed paddles should be used for mixing, such as anchor type, frame type, multi-layer paddle type, etc. The stirring speed is about 60 rpm. The use of highly centrifugal pumps should be avoided during transportation, and piston pumps or diaphragm pumps are more suitable.
3. Disperse the feed evenly. The key link in the dissolution of polyacrylamide is the uniform dispersion of the feed materials. After starting the mixer, a mechanical vibrating screen can be used to feed the material (the screen mesh is 10 meshes) to avoid the production of "large lumps" and "fish-eye-shaped" insoluble particles, so that the polyacrylamide can be fully dissolved. exert its effect.
4. Avoid contact with iron. In the dissolving, stirring, conveying and dosing system, plastic, enamel, aluminum, stainless steel and other materials can be used.
Application scope of anionic polyacrylamide
1. It is suitable for wastewater treatment in textile, printing and dyeing industries. Polyacrylamide can make the product have high adhesion fastness.
2. Used as a flocculant for sewage with coarse suspended particles, high concentration, positively charged particles, and neutral or alkaline water pH. Since the anionic polyacrylamide molecular chain contains a certain amount of polar groups, it can absorb the water. Suspended solid particles form bridges between particles to form large flocs. Therefore, it accelerates the sedimentation of particles in suspension and has obvious effects on solution clarification and filtration. This product is widely used in the treatment of chemical industrial wastewater and waste liquid, as well as municipal sewage treatment. Water treatment in tap water industry, high turbidity water purification, sedimentation, coal washing, mineral processing, metallurgy, steel industry, zinc, aluminum processing industry, electronics industry, etc.
3. Used in petroleum industry, oil production, drilling mud, waste mud treatment, preventing water channeling, reducing friction, improving recovery rate, etc.
4. Used in the papermaking industry, one is to increase the retention rate of fillers, pigments, etc. to reduce the loss of raw materials and environmental pollution; the other is to improve the strength of paper (including dry strength and wet strength). In addition, the use of PAM can also improve Paper tear resistance and porosity to improve visual and printing performance.
5. Other industries, synthetic resin coatings, civil grouting materials for water blocking, building materials industry, improving cement quality, construction industry adhesives, caulking repair and water blocking agents, soil improvement, electroplating industry, printing and dyeing industry, etc.