国外某萤石矿尾矿中锂铷回收试验

Experiment on Recovery of Lithium Rubidium from a Fluorite Tailings Abroad

国外某萤石尾矿中的Li2O、Rb2O含量分别为0.49%和0.37%,赋存在云母矿物中的锂、铷占总锂、铷的55.56%和56.14%,其余的锂、铷赋存在其他铝硅酸盐矿物中。云母矿物的粒度主要为0.01～0.15 mm,解离度高达87%,后续选别无需再磨矿。为确定锂铷回收工艺,进行了选矿试验研究。结果表明,试样在矿浆pH=4.5的情况下,以十二胺(280 g/t)为捕收剂、十二烷基苯磺酸钠(60 g/t)为泡沫调整剂,采用1粗3精、中矿顺序返回流程处理,可获得Li2O、Rb2O品位分别为1.07%和0.79%,Li2O、Rb2O回收率分别为46.32%和45.29%的锂铷混合精矿,较好地实现了锂铷的综合回收。

The content of Li2O and Rb2O in fluorite tailings abroad is 0.49% and 0.37%,respectively. Lithium and rubidium in mica minerals accounted for 55.56% and 56.14% of total lithium and rubidium,while the rest were found in other aluminosilicate minerals. Since the particle size of mica minerals is mainly 0.01 to 0.15 mm and the liberation degree is as high as 87%,subsequent grinding does not require re-grinding. In order to determine the lithium and rubidium recovery process,mineral processing experiment was conducted. The results show that with slurry pH=4.5,dodecylamine(280 g/t)used as collector,sodium dodecyl benzene hydride(60 g/t)used as foaming regulator,lithium-rubidium mixed concentrates with Li2O and Rb2O grade of 1.07% and 0.79%,and Li2O and Rb2O recoveries of 46.32% and 45.29% were obtained via one rough three cleaning and middlings back to the flowsheet in return process. Therefore,the comprehensive recovery of lithium rubidium was achieved.