The Effect of Applied Magnetic Field on the Mine Water Coagulation

It is significant to use different techniques to improve the overall efficiency of mine water treatment, because the utilization rate of treated mine water is low and the treating cost is high. According to the characteristics of water quality of coal mine water, the influence of the magnetic field on mine water treatment was studied in this paper in order to provide a reference for mine water treatment. It was found that magnetic field has effect on surface tension and electrical conductivity of mine water. When the magnetic field strength is less than 0.3T, the surface tension of the mine water decreases with the increase of magnetic field intensity, while the magnetic field strength is more than 0.3T, the surface tension of the mine water increases with the increase of magnetic field intensity. In the range of 0.0T ~ 0.5T, the mine water conductivity increases with the increase of magnetic field intensity and, as high as 14.8 ms/cm, then along with the increase of magnetic field intensity, the conductivity remains same. The influence of magnetic field intensity, amount of coagulant and magnetization time on coagulation were studied in this paper, and their effect were also investigated by Orthogonal test. The results show that when the magnetic field intensity is 0.35 T, magnetization time is 4 min and the amount of coagulant is 3 ml/L, the coagulation effect is the best. Under the condition, the mine water turbidity fell to 0.85 NTU from 200 NTU.