What are the commonly used chemicals for coal slurry wastewater treatment

Coal slurry water is discharged from the industrial tail water of the coal mine coal processing plant of wet coal processing, which contains a large amount of coal slurry and mud and sand, a large number of discharged into the waters, the deposition of the bottom of the water, siltation of the river, polluted the river, it has become one of the important sources of coal loss, and has a more serious pollution of the environment At present, China’s treatment of coal slurry water using flocculants are mainly aluminum salts, iron salts and inorganic salts containing Ca2+ in conjunction with polyacrylamide ( PAM) are used jointly. Polymerized aluminum chloride iron flocculant (PAFC) is a new type of inorganic polymer flocculant. This flocculant has the characteristics of high alkalinity of polymerized aluminum salt and strong adaptability to raw water, and also has the advantages of large molecular weight of polymerized iron and fast floc settlement. When PAFC flocculant is added to coal slurry water, the highly charged aluminum and iron polynuclear complexes in PAFC give full play to the neutralization effect, and the negatively charged coal slurry colloids coagulate with each other to form larger colloids. Due to the high molecular weight of PAFC, the hydrolysis products of this flocculant have good adhesive bridging and net paving and sweeping effects on the destabilized coal slurry colloids and iron hydroxide microflocs. Poly iron is the hydrolysis product of iron sulfate, the product contains various nuclear hydroxyl complexes, such as Fe2(OH)43+, Fe3(OH)54+, Fe4(OH)66+, these multinuclear complexes, in the adsorption of coal slurry water particles, at the same time, neutralize the negative charge of the surface of the particles, compression of particles in the bilayer, reduce the ξ-potential, destabilizing coal slurry water colloid, and promote the particles to flocculation and precipitation. Polyacrylamide (PAM) is a polymer flocculant that is researched, developed and used very much. There are three types of polyacrylamide commonly used, namely cationic, anionic and nonionic. Cationic polyacrylamide is based on acrylamide and cationic monomer polymerization, or polyacrylamide “cationization”. The surface of coal particles is negatively charged, cationic polyacrylamide is used as a flocculant, the molecular chain can not only bridge between the coal particles, but also neutralize the negative charge on the surface of the coal particles, reduce the repulsion between the coal particles, which is conducive to the aggregation and flocculation, thus increasing the speed of dewatering and lowering the water content of the refined coal products. Anionic polyacrylamide can be made by polymerization of acrylamide and anionic monomer. The copolymer of acrylamide and sodium acrylate is the anionic polymer flocculant with many applications. Acrylamide and sodium acrylate polymerization with a greater tendency to alternate copolymerization, easy to form an ideal alternate copolymer, so that the anionic unit in the molecular chain evenly distributed. The anionic flocculant is ring or tail adsorbed on the surface of coal particles, easy to form bridges between coal particles, has a compression effect on the double electric layer on the surface of coal particles, and is not easily affected by the pH value of the slurry. Nonionic polyacrylamide is a homopolymer of acrylamide (AM), which, because of its large range of charge density, can have a well-coiled conformation in a given slurry, giving it very good flocculation. Therefore, different types of polyacrylamide have different mechanisms of action, flocculation effects and suitable flocculation objects. The main products of flocculant manufacturer Xinhuan Water Treatment are: White polyaluminium chloride (food grade), drinking grade polyaluminium chloride, industrial grade polyaluminium chloride, anionic polyacrylamide, cationic polyacrylamide, nonionic polyacrylamide, petroleum recycling polyacrylamide, oil recovery polyacrylamide, polyacrylamide, polymer flocculant polymer flocculation coagulant, polymeric ferrous sulphate, polymerized iron and aluminium chloride, and other water treatment chemicals. Welcome customers to write to us to negotiate business! Tel/WhatsApp：15936201203 Email：maggie@xhwtm.com Contact:Maggie