大陆槽稀土矿石磁浮联合选矿工艺研究

针对四川德昌大陆槽稀土矿采用摇床重选—高梯度强磁选选矿工艺存在的稀土回收率低下(30%~40%)问题,开展了高梯度强磁选—浮选选矿新工艺试验研究。试验结果表明,将原矿按实验室闭路磨矿方式磨至-0.12 mm占100%(-0.075 mm占84.67%)后,先经过1粗1扫高梯度强磁选抛弃产率达82.22%的尾矿,然后以碳酸钠为pH调整剂、水玻璃为抑制剂、新型羟肟酸类螯合剂GYF为捕收剂对高梯度强磁选精矿进行1粗1扫2精闭路浮选,可获得REO品位为60.20%、REO回收率为63.00%的稀土精矿,REO回收率比原生产工艺提高了20个百分点以上。

Magnetic Separation-Flotation United Process on Rear-earth Ore from Dalucao

New process of high gradient high intensity magnetic separation-flotation is investigated on the Dalucao rare earth ore in Dechang of Sichuan Province，in view of the low recovery (30%~40%) in the process of gravity separation by shaking table-high gradient high intensity magnetic separation.The results indicated that，with the grinding fineness of 100% passing 0.12 mm(84.67% passing 0.075 mm) by the laboratory closed circuit grinding，the discarding rate of tailing reached 82.22% by the high gradient magnetic separation process of one roughing and one scavenging.Then，with sodium carbonate as pH modifier，sodium silicate as depressor，new oximeacid chelating GYF as collector，rare earth concentrate with REO grade of 60.20% and REO recovery of 63.00% was obtained by treating the rough concentrate above through the closed circuit flotation of one roughing，two cleaning and one scavenging.Recovery of REO is increased by 20%，compared with the previous production process.