南部非洲某伟晶岩型锂矿锂的浮选工艺流程

    Flotation Process of Lithium from a Pegmatite-type Lithium Ore in Southern Africa

    • 摘要: 矿石中锂矿物以锂辉石、含锂白云母和锂云母为主,少量羟锂磷铝石、锂电气石和磷锰锂矿,脉石矿物主要为长石和石英。原矿Li2O含量为1.60%,72.71%的锂以锂辉石形式存在,16.90%以锂云母形式存在,2.91%的锂赋存于羟锂磷铝石、磷锰锂矿等锂的磷酸盐矿物中,还有7.48%的锂以锂矿物包裹体分散于石英/长石中,可回收的锂矿物主要为锂云母和锂辉石。锂云母与锂辉石可浮性很相近,通过实验确定了适配的浮选捕收剂、调整剂及活化剂,获得了锂云母浮选精矿和锂辉石浮选精矿。以有机酸AS为捕收剂、碳酸钠和氢氧化钠为调整剂、氯化钙为活化剂,采用锂云母优先浮选工艺流程,闭路实验获得Li2O品位2.92%、Li2O回收率15.47%的锂云母精矿和Li2O品位6.36%、Li2O回收率为71.20%的锂辉石精矿,产品合计Li2O的回收率为86.67%,对应的Li2O品位为5.26%。

       

      Abstract: The primary lithium minerals in the ore are spodumene, lithium-bearing muscovite, and lepidolite, with small quantities of montebrasite, elbaite, and lithiophyllite. The gangue minerals primarily consist of feldspar and quartz. The Li2O in the raw ore is 1.60%, 72.71% of the lithium is present in the form of spodumene, 16.90% in the form of lepidolite, 2.91% in the form of lithium phosphate minerals such as montebrasite and lepidolite, and 7.48% as lithium mineral inclusions within quartz and feldspar. The recyclable lithium minerals primarily include lepidolite and spodumene. The floatability of lepidolite and spodumene is quite similar, and their floatability can be adjusted through the use of appropriate flotation collectors, regulators, and activators, allowing for the flotation of both lepidolite and spodumene concentrates. Using organic acid AS as the collector, sodium carbonate and sodium hydroxide as regulators, and calcium chloride as the activator, lepidolite concentrate with a Li2O grade of 2.92% and a recovery of 15.47%, as well as spodumene concentrate with a Li2O grade of 6.36% and a recovery of 71.20%, were obtained through a small-scale closed-circuit test. The total Li2O recovery was 86.67%, with a corresponding Li2O grade of 5.26%.

       

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