Application of Chemical Desulfering Technology to Groundwater of Mined-Out Area in Coal Mine

The coal mines of Henan province are surely abundant water mining areas in China. The problem of the waste groundwater is much serious too. Through synthetical analyses of the water chemical characteristics , water chemical environment and the water chemical origin of acid groundwater, this paper proposes the principle of chemical sulfer erasing technique which can process mine acid water and the compound coagulant applying method. Some corresponding technology parameters are discussed. The weight ratio of Ca(OH)₂ and 4CaO·Al₂O₃·Fe₂O₃ is about 1:1.3~1:1.5. Quick lime quantity put in must diminish 50 mg/L when the temperature is increased by 10°C and diminish 25mg/L when pH value is increased by one unite. The processing of mine water with the method of chemical sulfer erasing technique is practicable.