含碳酸盐赤铁矿石磁选精矿的强化分散浮选

摘要

采用强化分散直接反浮选技术，以碳酸钠和水玻璃为分散剂，强化矿浆分散，以削弱碳酸铁对浮选的影响，同时从药剂用量等方面系统研究适宜矿石的最佳浮选工艺条件，并采用SEM、XRD和EDS等手段对原矿、精矿和尾矿的形貌及矿物组成进行表征。结果表明：给矿样粒度较细时，容易造成细颗粒的非选择性聚团以及细粒颗粒在粗颗粒上罩盖，添加碳酸钠和水玻璃能够强化矿浆分散，有利于含碳酸盐难选赤铁矿石磁选精矿的浮选分离；在最佳药剂制度下，通过一粗两精两扫、中矿顺序返回的闭路流程能够获得Fe品位为66.20%，回收率为71.52%的铁精矿。%Based on the investigation of ore properties, a flotation separation technology of hematite magnetic separation concentrate containing iron carbonate was developed with enhanced dispersion by adding sodium carbonate and sodium silicate to eliminate the negative impact of iron carbonate on flotation. The optimum flotation conditions were studied systematically. The structure and mineral composition of raw ore, concentrate and tailings were discussed by means of SEM, XRD and EDS. The results show that in the fine­grained sample, the fine grains are prone to agglomerate each other and cover on the coarse grains. Adding sodium carbonate and sodium silicate can enhance pulp dispersion, which benefits the selective separation of magnetic separation concentrate containing iron carbonate. An iron concentrate with Fe grade of 66.20%and Fe recovery of 71.52%can be obtained on optimum reagent condition through one rougher­two cleanings­two scavenges closed­circuit flowsheet.