某白钨尾矿中伴生萤石的选矿试验

江西某白钨浮选尾矿萤石、方解石含量均较高,CaF_2、CaCO_3含量分别为12.33%和9.79%,属于复杂难选伴生萤石二次资源。为从该二次资源中高效回收萤石,进行了详细的选矿试验。结果表明,酸性水玻璃+腐植酸钠组合使用可在浮选萤石时有效抑制方解石等脉石矿物。在氧化石蜡皂731总用量为1 150 g/t,酸性水玻璃+腐植酸钠总用量为(2 750+275)g/t的条件下,采用1次粗选、粗精矿再磨后6次精选、粗选尾矿和精选1尾矿各2次扫选流程处理试样,最终获得CaF_2品位95.26%、回收率85.37%的萤石精矿,较好地实现了从白钨尾矿中综合回收萤石的目标。

Beneficiation Experiments of a Certain Scheelite Tailing with Fluorite Contained

The contents of fluorite and calcite in a Scheelite flotation tailing in Jiangxi are high with contents of CaF₂ and CaCO₃ 12.33% and 9.79% respectively.It belongs to a complex refractory secondary ore with fluorite contained.In order to efficiently recover fluorite from the secondary resources,a detailed beneficiation experiment was carried out.The results showed that the combination of acidic water glass and sodium humate effectively inhibited calcite and other gangue minerals in floatation of fluorite.Under addition of 731 oxidized paraffinum sodium salt 1 150 g/t,the total dosage of acidic water glass + sodium humate (2 750+275) g/t,and by the process of one roughing,six cleanings of coarse concentrate after regrinding,two scavengings for coarse tailings and tailings of cleaning one separately,fluorite concentrate with CaF₂ grade of 95.26% and the recovery rate of 85.37% was finally achieved,and targets at the comprehensive recovery of fluorite from scheelite tailings were well realized.