Abstract: Taking phosphate tailings as the research object, simulating the scenario of tailings filling goaf, carrying out pollutant release test and prevention test, discussing the change rule of pollutant concen⁃ tration in wastewater with time and the removal effect of different agents on total phosphorus. The results showed that except for total phosphorus, the concentration of other pollutants decreased with the increase of leaching time. In the HJ 557 oscillation leaching test, only the total phosphorus concentration exceeded the standard, which was 15.53 mg/L. Based on this, it was determined that the phosphate tailings were Class II general industrial solid waste. Lime and coagulant can effectively remove total phosphorus in wastewater. The total phosphorus content in the leaching water can be reduced to less than 0.1 mg/L by adding 0.04 % lime for stirring for 10 min and then filtering, and then adding 0.006 7% polyferric sulfate, which can meet the first-level emission standard of GB 8978—1996. The cost of wastewater treatment agent per ton is 0.231 RMB. The research results can provide reference for the wastewater treatment produced in the filling process of phosphate tailings.

Key words: phosphorus tailings, pollutant release, wastewater, phosphorus removal, coagulation?sedimentation method