Polyacrylamide for Sand Washing Plant
Polyacrylamide is used in sand washing plants. The mud water in sand washing plants is a suspended liquid containing a certain amount of fine mud particles in the water. The characteristics of the mud depend on its composition and local geological conditions. Generally, the appearance of the mud is earthy yellow and uniform. It is sticky and will not delaminate after being stationary for a long time.
Sand washing plants usually choose anionic polyacrylamide for processing. Anionic polyacrylamide looks like white particles and is a water-soluble polymer. Because its molecular chain contains a certain number of polar genes, it can absorb solids suspended in water. particles to form bridges between particles or to agglomerate particles to form large flocs through charge neutralization. Therefore, it can accelerate the sedimentation of particles in suspension, and has obvious effects on accelerating solution clarification and promoting filtration.
1. When using polyacrylamide, it can be formulated into an aqueous solution with a concentration of 0.01%-0.05%. It is appropriate to use neutral water without salts and impurities.
2. When the polyacrylamide is dissolved, evenly sprinkle the anionic polyacrylamide product 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 anionic polyacrylamide product can fully exert its effect, and select the appropriate pH value and product dosage through experiments.
4. When adding anionic polyacrylamide 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 when using 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.
Polyacrylamide used in sand washing plants can be used alone or in combination with PAC in water treatment, but the mixing of the two must be done separately. The user determines the amount of water added and the dosage during dilution according to their respective conditions.