Mechanism Analysis on High lron and Manganese Content Mine Water Treatment with Modified Volcanic Rocks

With the volcanic rocks filter material as the carriers, hydrated manganese dioxide modified filter material was prepared to the iron and manganese ion r emoval from the mine water.When the filtration speed was 7.0 m/h and during a continued 54 h filtration period, the manganese ion removal rate with modified volcanic rocks would be 94.8%99.3%.The X-ray diffraction, scanning electron microscopy-energy spectrum and other means combined verified that after the volcanic rocks modif ied, a hydrated manganese dioxide layer covered on the surface of the modified volcanic rocks would have rich surface hydroxyl (- -Mn一_OH) .According to the surface f itting mode, H in hydroxy| could have a surface complexation reaction with Mn2+ and Fe2+ in mine water, finally Mn2+ and Fe2+ could be absorbed by surface hydroxyl and the hydrogen could be replaced.Therefore, the removal of the iron and manganese ion could be realized.