Mineral Composition and Occurrence State of Rare Earth Elements in Shangzhuang Phosphorus-rare Earth Ore Deposit,Qinghai Province
Through whole rock chemical analysis,microscopic identification,scanning electron microscope analysis(SEM)and mineral automatic quantitative analysis(AMICS),the ore material composition and rare earth element occurrence state of Shangzhuang phosphorus-rare earth deposit were identified.The TREO grade of the ore is 0.08％to 0.17％.The main mineral compositions are diopside,biotite,magnetite,apatite,calcite and sphene.The rare earth minerals in the ore are mainly apatite(TREO=1.00％)and sphene(TREO=2.57％),with contents of 6.40％and 1.94％,respectively.The ore contains 0.07％to 0.15％LRE2O3 and 0.01％to 0.02％HRE2O3.The distribution rates of rare earth elements in apatite and sphene are 53.33％and 41.54％,respectively.The particle size of apatite containing rare earth minerals is mainly distributed in 32 μm to 106 μm,and the particle size of sphene is mainly between 6.8 μm and 38 μm.The dissociation degree of miner-al monomer is high,apatite accounts for 46.59％and sphene accounts for 25.84％.The deposit is a magmatic rare earth de-posit related to ultramafic rocks.Rare earth mainly occurs in the carrier minerals apatite and sphene in the form of isomor-phism,which can be directly recovered by enriching apatite and sphene concentrate.
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