Mine water pollutants migration and transformation in gob filling

Based on the experiment data, dynamic model of migration and transformation law was established. By comparison between predicted value and measured value, the result shows that model accuracy is very high and the greatest error is only 25.8%. By analyzing grain size, mineral composition and mineral cation exchange of gob filling, the treatment mechanism was studied. The result shows that SS, iron and manganese are removed by filtration, precipitation, biochemical reaction and sorption. Finally, above model was used to predict treatment effect of the mine water in the the coal mine. The result shows that the gob purifying greatly decreases pollution load with good pretreatment effect. Above research will establish theoretical base for determining design parameter in gob purifying project.