改性火山岩处理高铁锰矿井水机理分析

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

以火山岩滤料为载体,制备了水合二氧化锰改性滤料用于去除矿井水的铁锰离子。在滤速为7.0 m/h,连续54 h的过滤周期内,改性火山岩对锰离子的去除率达94.8%～99.3%。结合X射线衍射(XRD),扫描电镜-能谱(SEM-EDS)等表征手段,确认火山岩改性后,表面覆盖的水合二氧化锰层具有丰富的表面羟基(以—Mn—OH表示),根据表面配合模式,其羟基中氢能与水中的Mn2+和Fe2+发生表面络合反应,最终Mn2+和Fe2+被表面羟基吸附并交换出氢,从而实现对铁锰离子的去除。

With the volcanic rocks filter material as the carriers,hydrated manganese dioxide modified filter material was prepared to the iron and manganese ion removal 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 modified,a hydrated manganese dioxide layer covered on the surface of the modified volcanic rocks would have rich surface hydroxyl（—Mn—OH）.According to the surface fitting mode,H in hydroxyl 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.