某伟晶岩型锂辉石矿石中锂的高效回收试验

湖南某伟晶岩型锂辉石矿Li2O品位为1.35%，主要脉石矿物为石英和长石，次为绿泥石、高岭石等易泥化矿物。传统的“三碱两皂”法的锂辉石浮选工艺存在浮选药剂用量大、浮选时间长、浮选指标不佳、选矿回水难以直接回用的缺点。为实现该矿石中锂的高效回收利用，基于原矿性质，进行了选矿试验研究，最终确定采用脱泥—磁选—浮选工艺流程。在磨矿细度为-0.074 mm占66.55%的条件下，选取ZT为中性调整剂、ZB为组合捕收剂，浮选阶段经“1粗2精2扫”，最终获得Li2O品位6.05%、Li2O回收率79.77%、Fe2O3含量0.83%的锂精矿，有效实现了锂辉石中锂的高效回收，产品达到化工级-1产品的品质标准。

High-efficient Recovery Test of Lithium in a Certain Pegmatite-type Spodumene

The Li2O grade of a pegmatite-type spodumene deposit in Hunan province is 1.35%. The main gangue minerals are quartz and feldspar， following with easily sliming minerals like chlorite and kaolinite. The traditional spodumene flotation process "three alkali and two soap" method has the disadvantages of large dosage of flotation reagents， long flotation time， poor flotation indexes， and the backwater is difficult to directly recycle. In order to realize the high-efficient recovery and utilization of lithium in the ores， the beneficiation experiments were carried out based on the characteristics of the raw ore and the process flow of desliming， magnetic separation and flotation was finally determined for the treatment of the ores. Under the condition of the grinding fineness of -0.074 mm accounting for 66.55%， ZT as the neutral regulator and ZB as the combined collector， the final lithium concentrate with Li2O grade of 6.05%， Li2O recovery rate of 79.77% and Fe2O3 content of 0.83% was obtained after "one roughing， two cleaning and two scavenging" in the flotation stage. The high efficiency recovery of lithium from spodumene was effectively realized， and the product reached the the first grade chemical product standard.