Polyacrylamide (cpolyacrylamids) referred PAM, is a linear polymer, a water-soluble polymer compound is one of the most widely used species, polyacrylamide and its derivatives can be used as an effective flocculant, thickeners, paper and fluid drag reduction enhancer agent, is widely used in water treatment, paper, petroleum, coal, mining, geology, textile, construction and other industrial sectors. First, using the characteristics of a, as a flocculant, polyacrylamide has a good flocculation ,, that is destabilizing characteristics, the performance of flocculation and sedimentation, breaking the original balance; b, polyacrylamide there is a good adhesion, can used as a sizing agent in the textile industry; c, polyacrylamides may also be used for the production of glue, good thickening properties can be well increased glue consistency; d, in the paper industry, polyacrylamide good dispersibility played a significant purpose, can be a good stable of paper; e, good lubricity and resistance reduction capability also makes polyacrylamide has many applications. Second, the role of PAM principle Introduction: flocculation principle: PAM used for flocculation, the flocs with the relevant properties of the type of surface, in particular zeta potential, viscosity, PH value and the turbidity of the suspension, the zeta potential of the particle surface, is particle inhibitor reason to join the opposite surface charge PAM, can snap the potential decrease in cohesion. ?? Adsorption bridging: PAM molecular chain is fixed on different surfaces of the particles, forming bridges between the polymer particles, the particles form aggregates and sedimentation. ?? Surface adsorption: adsorption of polar groups of various particles PAM molecule. ?? Enhancement: PAM molecular chain and dispersed through a variety of mechanical, physical, chemical and other effects, the dispersed phase implicated together to form a network, thereby enhancing the role play. ? Third, polyacrylamide main purposes: polyacrylamide (PAM) a high molecular weight, water soluble, and can adjust the molecular weight, and may be the introduction of various ionic groups to obtain a specific performance. Low molecular weight material is dispersed effectively thickeners or stabilizers, the high molecular weight flocculant is important. ?? It can produce the water-insoluble hydrophilic gel, and its surface dissolved substances many groups have good adhesion. Because of these properties are widely used PAM flocculation, thickening, drag reduction, gels, adhesive, scale, and other fields. ???? The use of methods polyacrylamide a, polyacrylamide can not go directly on to the waste water, prior to use it must first be dissolved in water, generally using the dissolution tank is dissolved, stirring to dissolve, the agitator blades line speed is not more than 8 m / sec, in order to avoid degradation. b, dissolved polyacrylamide water should be clean water, you can not use water. Room temperature water to raise the water temperature may help dissolve, but the temperature should not exceed 60 ℃, the water temperature is too high prone to degradation. Strongly acidic or strongly alkaline water is not suitable for the preparation of polyacrylamide solution. c, polypropylene acrylamide concentration is generally 1-3 g / liter of water can be, you can eat special requirements. d, polyacrylamide formulated as a solution, the non-anionic solution shelf life is generally not more than a week, save on cationic solution is generally not more than a day, according to the actual situation in the preparation, in order to avoid waste. Solution to guard against the sun and rain. V. polyacrylamide store a, polyacrylamide should be stored in enamel, galvanized, aluminum or plastic bucket, can not be stored in iron containers. b, so that the temperature must not exceed 60 ° c, polyacrylamide hygroscopic, should be sealed and stored in a cool dry place, the temperature is lower than 35 ℃. d, the best storage time, now with the current best when used in conjunction with other agents, the need to pay attention to the order of addition; there is not in full bloom with iron. e, the stirring speed to maintain polyacrylamide and not too fast, because it too quickly may cause damage to the molecular structure.