澳大利亚某锂辉石矿预先脱泥——浮选试验研究

Study on Pre-desliming-flotation Tests of Spodumene Ore in Australia

澳大利亚某进口锂辉石矿含有较多的矿泥,对浮选作业产生不利影响,试验采用水力沉降法、浮选法等不同方法对锂辉石矿进行预先脱泥,考察了不同方法的脱泥效果及对后续锂辉石浮选的影响。研究发现以十二烷基硫酸钠作为浮选药剂对锂辉石矿进行浮选脱泥取得了最佳的脱泥效果,脱除的矿泥量大、含锂品位低、矿泥中锂的损失小,脱泥后再浮选锂辉石,获得的锂辉石粗精矿品位有了很大程度的提高。预先脱泥后的锂辉石矿经过一次粗选两次精选三次扫选的浮选流程,可获得良好的选矿指标。闭路试验表明,该进口锂辉石矿原矿Li2O含量为1.42%,经预先脱泥-浮选锂辉石选别流程处理后,获得的锂辉石精矿Li2O品位为5.83%,Li2O回收率为78.54%。

Spodumene ore imported from Australia contains a large amount of slime,which has a negative impact on flotation.Different methods such as hydraulic sedimentation and flotation were used for pre-desliming spodumene ore.The desliming actions of different methods and their effects on subsequent spodumene flotation were investigated.It is found that desliming of spodumene ore by flotation with sodium dodecyl sulfate as reagent achieves the best desliming effect.The desliming amount is large,while lithium grade of the discarded slime is low,hence the lithium loss in the sludge is small;and the grade of rough spodumene concentrate obtained by flotation after desliming can be improved greatly.After pre-desliming,spodumene ore can obtain good beneficiation indexes through a flotation process of one roughing,two cleaning and three scavenging.Closed circuit test shows that the content of Li2O in this imported spodumene ore is 1.42%.After pre-desliming-flotation process,Li2O grade of the concentrate is 5.83%,and 78.54% of Li2O recovery can be achieved in spodumene concentrate.