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Froth flotation was performed to study the effect of phosphate addition in the experiment to remove As from tailing of Sangdong Mine. The experiment without Trisodium phosphate (T.S.P) showed that the removal rate of As was 88.7% and weightratio of floating material was 2.52%. By contrast, the experiment with T.S.P showed that the removal rate of As was 92.74% and weight-ratio of floating material was 2.26%. In flotation without T.S.P, the average particle size of float material was 19.34 um and the amount less than 10um was 40.2%. On the other hand, in flotation with T.S.P the average particle size of float material was 176.8 um and the amount less than 10um was 6.5%. The result of X.R.F analysis presented that contents of SiO 2 was 42.74% in float material of the experiment without T.S.P. In contrast, contents of SiO 2 was 29.56% in float material of the experiment with T.S.P.

주제어 : 상동광산, 광물찌꺼기, 부유선별, As AbstractFroth flotation was performed to remove As from the tailing of Sangdong Mine. When the tailings of Sangdong Mine were analyzed by the Standard Method for the Soil Environment Conservation, the concentration of As was found to be at a serious level (282 mg/kg), exceeding countermeasure standard (75 mg/kg). Froth flotation was performed to remove As and preliminary tests were performed to select the reagents. Specifically, froth flotation was performed using collector and frother, KAX and DF250 respectively. An experiment based on pH changes found that the removal rate was highest at pH6. The removal rate of As was highest at agitating rate 1500 according to the agitating rate. In the experiment based on the quantities of KAX added, the removal rate of As was found to be highest at 300 g/ton and was reduced at higher levels than 300 g/ton. An experiment based on pulp density found that the removal rate was highest at pulp density 30%. It was possible to adjust the As level --which exceeded countermeasure standard (75 mg/kg) --to 22.5 mg/kg to satisfy the Warning standard (25 mg/kg), from the results of froth flotation