THE TUNGSTEN TECHNOLOGICAL MINERALOGICAL RESEARCH OF SKARN-TYPE ORE IN HUANGSHAPING,GUIYANG

Huangshaping is one of the most important polymetallic deposits in south of Hunan.The characteristics of tungsten technological mineralogical of skarn-type were investigated by means of optical microscopy,chemical analysis,scanning electronic microscopy(SEM) and X-ray diffraction(XRD).It is demonstrated that the technology type of ore is mainly tungsten-molybdenum ore of skarn-type,which is 75% of the total,w(WO3)=0.15%~1.8%.The mineral is mainly scheelite,mostly distributed in diopside,fluorite and garnet skarn-type ore as medium-coarse disseminated and veinlet.Scheelite generally contains molybdenum.There is trade-off relationship between tungsten and molybdenum,molybdenum is dispersed as isomorphism in the crystal lattice of scheelite.Size analysis show that the average size of scheelite is 0.12 mm,which is medium-fine grained disseminated.Scheelite trends to enrich in fine fraction.When grinding fineness of ore comprehensive sample is 80~200 mesh and 200 mesh,free fractional degree of scheelite is 85.14% and 92.62%.When 80% or 100% of ore comprehensive sample is in 200 mesh,the ideal recovery of tungsten,which with free fractional degree of scheelite in 200 mesh,is 81.11% and 92.62%.Increasing grinding fineness of ore comprehensive sample has a better utilization prospect.