江西某微细选钨尾砂工艺矿物学研究

为充分回收选钨尾砂中的有价矿物，利用矿物自动分析仪（MLA）、化学分析、X射线衍射仪（XRD）、扫描电镜等手段对江西某微细选钨尾砂进行系统性工艺矿物学研究。结果表明：① 试样Cu含量为0.11%、WO3含量为0.29%，其中WO3达到最低利用工业品位；主要脉石成分SiO2含量为67.52%。② 试样-0.038 mm粒级产率为55.28%，-0.075 mm粒级含量达83.82%，细粒级含量较高；Cu、WO3明显富集于-0.038 mm微细粒级，其他粒级中含量相对较低；Al2O3主要富集于-0.038 mm粒级中，而各粒级Pb、Zn、Mo含量均较低。③ 试样矿物组成十分复杂，金属矿物主要为黄铜矿、白钨矿、黑钨矿；非金属矿物主要为石英、白云母、黑云母、长石、绿泥石。④ 黄铜矿单晶颗粒外形常呈条状、角形或其他不规则形状，常见角状细粒黄铜矿与黄铁矿、白云母连生；白钨矿单晶颗粒外形常呈致密状、块状或不规则状，常见不规则微粒白钨矿包裹于绿泥石、萤石中；黑钨矿单晶颗粒常呈三角状、半自形或他形粒状，常见以微粒浸染状被方解石、石英包裹；白云母多数呈叶片状单体存在；黑云母主要为板状或短柱状，横切面为六边形，集合体为鳞片状，多数呈单体。通过分析确定回收目标矿物为硫化铜矿物和云母类矿物，并设计浮选回收工艺为1粗3精1扫流程和1粗5精1扫、中矿合并脱水流程。

Study on Process Mineralogy of a Micro-fine Particle Tailings after Tungsten Selection in Jiangxi

In order to fully recover valuable minerals from tungsten selection tailings,systematic process mineralogy of a micro-fine tungsten selection tailings in Jiangxi was studied by means of mineral automatic analyzer (MLA),chemical analysis,X-ray diffractometer (XRD) and scanning electron microscope.The results showed that:① The contents of Cu and WO3 in the sample are 0.11% and 0.29%,and the contents of WO3 reaches the lowest industrial ultilization grade.The content of gangue component SiO2 is 67.52%.② The grain yield of -0.038 mm is 55.28%,and the grain content of -0.075 mm is 83.82%,indicating the high fine grain content.Cu and WO3 are obviously enriched in -0.038 mm fine particles,while the contents in other particles are relatively low.Al2O3 is mainly enriched in -0.038 mm grain size,while the contents of Pb,Zn and Mo in each grain size are low.③ The mineral composition of the sample is very complex,and the metal minerals are mainly chalcopyrite,scheelite and wolframite.Non-metallic minerals are mainly quartz,muscovite,biotite,feldspar and chlorite.④ The appearance of chalcopyrite single crystal grains is often strip,angular or other irregular shape.Fine-grained chalcopyrite with angular shape is commonly associated with pyrite and muscovite.The appearance of scheelite single crystal particles is usually dense,massive or irregular.Irregular fine-grained scheelite is often wrapped in chlorite and fluorite.Wolframite single crystal particles are usually triangular,semi idiomorphic or allotriomorphic granular,and it is often impregnated by calcite and quartz.Muscovite mostly exists as lamellar monomer.Biotite is mainly plate-shaped or short columnar,hexagonal in cross section,and scaly in aggregate,most of which are monomers.The recovery target minerals are determined as copper sulfide minerals and mica minerals,and the flotation recovery process is designed as one roughing,three cleaning and one scavenging process,one roughing,five cleaning and one scavenging and medium ore combined dehydration process through analysis.