河南某低品位难选钼矿石工艺矿物学研究

Study on Process Mineralogy of a Low-grade Molybdenum Ore in Henan

河南某难选低品位钼矿伴生白钨矿,同时含有少量的黄铜矿。为解决钼钨铜选矿指标偏低的问题和实现其他有用矿物的综合回收,采用化学分析、显微镜下分析和MLA分析等方法对该钼矿进行了工艺矿物学研究。结果表明:矿石中可回收元素钼品位为0.086%,WO_(3)品位为0.108%,Cu品位为0.019%,Fe品位为10.57%,钼、钨、铜、铁分别主要以辉钼矿、白钨矿、黄铜矿和磁铁矿的形式存在;辉钼矿、白钨矿、铜矿物和磁铁矿嵌布关系复杂,粒度分布粗细不均,常与其他有用矿物和脉石连生或包裹。部分辉钼矿与白钨矿连生或包裹于白钨矿中,导致钼回收率偏低。铜矿物中-0.01 mm粒级含量高达33.53%,这部分铜矿物在磨矿过程中难以解离,易损失于尾矿中,影响铜回收率;钼浮选矿浆中辉钼矿、白钨矿、铜矿物和磁铁矿总解离度分别为94.06%、89.33%、86.15%、89.58%。白钨矿、铜矿物和磁铁矿的解离度较低,易造成选矿指标不理想。

A refractory low-grade molybdenum ore in Henan is associated with scheelite and contains a small amount of chalcopyrite.In order to solve the problem of low beneficiation index of molybdenum,tungsten and copper and realize the comprehensive recovery of other useful minerals,the process mineralo⁃gy of the molybdenum ore was studied by chemical analysis,microscopic analysis and MLA analysis.The re⁃sults show that the recyclable elements Mo,WO_(3),Cu,Fe grade in the ore are 0.086%,0.108%,0.019%,10.57%,and molybdenum,tungsten,copper and iron are mainly in the form of molybdenite,scheelite,chalcopyrite and magnetite respectively.Molybdenite,scheelite,copper and magnetite are disseminated in complex relationships,with uneven particle size distribution,and are often connected or wrapped with other useful minerals and gangues.Some molybdenite is associated with scheelite or wrapped with scheelite,result⁃ing in low recovery of molybdenum.The content of-0.01 mm fraction in copper minerals is as high as 33.53%,this part of copper is difficult to dissociate during the grinding process,and it is easy to lose in the tailings,which has a negative impact on the copper recovery rate.The total dissociation degree of molybde⁃nite,scheelite,copper and magnetite in molybdenum flotation slurry is 94.06%,89.33%,86.15%,89.58%respectively.The dissociation degree of scheelite,copper minerals and magnetite is low,resulting in unsatis⁃factory beneficiation indexes.