Study on Process Mineralogy of Luobusha Low-grade Chromite Ore
In order to find out the ore properties of Luobusha low-grade chromite in Tibet,chemical analysis,optical microscope identification,scanning electron microscope analysis,EDS micro-area compo-sition analysis and other rock and mineral testing methods were used to study the chemical composition,mineral composition,mineral dissemination characteristics,process particle size of main minerals and oc-currence state of chromium elements of ore samples in detail.The results show that the content of Cr2O3 is 18.50%,and the contents of harmful components MgO and SiO2 are 35.32%and 26.55%respectively.The main chromium-containing minerals are aluminum-iron-magnesium chromite.The gangue minerals are mainly chromium-containing silicate minerals olivine and serpentine,and a small amount of chlorite,pyrox-ene,calcite and ankerite,as well as trace amounts of potassium feldspar and pyrite.The grain size of chro-mite is uneven,and it is usually closely associated with olivine,serpentine and chlorite.Some fine chromite is wrapped by olivine,which is not easy to dissociate.Chromium mainly occurs in chromite,and a small amount occurs in olivine,serpentine and chlorite.The average chromium content of chromite single mineral is 39.17%,the average chromium content of olivine and serpentine single mineral is 0.44%,and the aver-age chromium content of chlorite single mineral is 1.15%.
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