Investigation of the effects of different coagulant types for dewatering of coal plant tailings

In this study, the effects of different types of coagulants were investigated on the precipitation of coal preparation plant wastewaters and the results were compared with each other to determine the most suitable coagulant type. In coagulation tests, parameters such as type and amount of coagulant, media pH, mixing time and speed were tested. After each test, the turbidity of the suspension was measured and the coagulation efficiencies were calculated. The results of coagulation experiments with iron sulphate, aluminum sulphate and ferric chloride showed that the coagulation efficiencies were; 67.21%, 88.71% and 94%, respectively. During the experiments, the costs of the coagulants have been determined from the consumption amounts of the coagulants. All these results indicate that iron chloride is more efficient and economical than other coagulants