Matters needing attention of using and dissolution method of solid polyacrylamide:
1. Polyacrylamide (PAM), also called flocculating agent, the dry powder of which is not suitable for using, should be confected into aqueous solution before using of some consistency to ensure its using effect.
2. The consistency of flocculating agent commonly is 0.05%-0.1%, in other words, add 0.5-1g dry powder into 1liter water. While confecting, less amount of water can be added, and certain amount of water in which the consistency is needed should be added after the polymer dissolves, because the dissolving speed of polymer can quicken while the consistency of polymer solution is high.
3. The specific operation of confection as follow: add certain amount of water into the dissolving jar, then start the blender and sift the dry powder around the vortex of water equably. The speed of blending is about 200 resolution/min. And it should be noticed that agglomeration should be avoided after the dry powder particles get into water. Generally speaking, it can dissolve completely after 60's blending.
4. The water which dissolves polyacrylamide is good to be tap water at normal temperature. Improving the temperature suitably can speedup dissolution, but the water temperature should not surpass 50℃, because polymer will produce heat-degradation when the temperature is too high, the using effect will be influenced as well.
5. The dry powder state PAM can be stored for over 2 years in dry, dark and cool place, but it is not suitable to be stored after being confected into solution. Solution of negative ion and no-nion polyacrylamide commonly can be stored no more than one week, while solution of positive ion commonly can be stored no more than two weeks.
6. Ferric ion is the catalyzer which causes polyacrylamide. So in confection, transfer and storage the solution of polyacrylamide, contact between the solution and ferric and ion should be avoided. Stainless steel, glass fiber reinforced plastics, etc. Made device the best choice for confecting polyacrylamide solution.