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Polyacrylamide precipitation effect in mining industry
Mining industry is a large water, if the production of waste water without treatment and direct discharge, it is bound to cause water pollution, how to deal with the requirements of mining waste water has become the primary consideration of mining enterprises. In this paper, we introduce the treatment of mineral processing wastewater with flocculant and its effect.
Mining industry of the mine water mainly accompanied by mining the surface infiltration water, mine water, rock pore water, underground water aquifer dewatering, and the material is discharged into the water will cause water pollution, filling, filling water, underground production dust, filling selected refinery and coal washery sewage depends mainly on the nature of the material and the concentration in the wastewater, containing the water is the main source of mine wastewater. Generally, the mine water pH value in the 7~8, is weakly alkaline. But mine water containing sulfur, the SO42 more, mostly acidic water. Acid mine waste water is a sulfide mineral deposit in the mining process is oxidized and produced by pH less than 6.5 of the mine waste water, its PH is generally 3 - 6.5, total acidity. Acid mine water not only corrosion underground drainage equipment and other mining equipment, resulting in economic losses, but also affect the health of the workers in the mine, the concentration of some heavy metal ions in the acid mine increases with the increase of acidity, the toxicity is also increased, the potential damage to biological.
At present, the treatment of acid mine water is mainly limestone, lime neutralization method, biological chemistry method, wetland ecological engineering treatment method. The lime neutralization method is a common method for treating acid water in coal mine. Its main advantages are simple process, convenient operation, and the effluent pH can reach the discharge standard, but it is very easy to produce a large amount of solid waste, resulting in two pollution.
With the development of science and technology, mineral processing wastewater, slag accumulation leaching water can use some chemical products to the suspended solids and heavy metals and other harmful substances, such as the successful treatment, and even reach zero emissions, direct use of treated water recycling! Polyacrylamide flocculant is generally used to treat acidic waste water music Bangjing suggested that mines, commonly used is anionic polyacrylamide and nonionic polyacrylamide and its molecular weight reached 14 million more than the effect of better, the degree of hydrolysis to according to the main component to determine the pH value of wastewater and the wastewater.
Special polyacrylamide flocculant for treatment of mine wastewater can promote the rapid settlement of the effective solid material, or accelerate the concentration of fine objects, improve the effect of solid-liquid separation, reduce the loss of tailings and environmental pollution, reduce production costs. Under normal circumstances, the process of mineral processing, the need for high molecular weight polyacrylamide, so that better guarantee the sedimentation rate, the centrifugal process will be better, more easy to achieve better economic effects.