Study on mineralogical characteristics and occurrence state of elements of rhodochrosite in Tongren area
Tongren Guizhou is located in the"Manganese Triangle"region of China.The reserves of manganese ore are abun-dant,mainly in the form of rhodochrosite.X-ray fluorescence spectrometer(XRF),X-ray diffractometer(XRD),simultane-ous thermal analyzer(TG-DSC),scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS)and other modern characterization and analysis methods were used to study the occurrence state,mineralogical characteristics and py-rolysis properties of C,O,Mn,Ca and other elements in rhodochrosite.The results showed that the mass percentage of man-ganese in the mineral was 14.656％,and the mass percentage of manganese/iron was about 4.22,which belonged to low-grade medium-iron acid rhodochrosite.The chemical composition and phase composition of the ore were relatively complex.Among them,the existence form of manganese element was mainly manganese carbonate,and a small amount was manga-nese dioxide.The calcium and magnesium elements were mainly in the form of dolomite,and a small amount existed in the form of silicate.At temperature ranging from 500℃ to 600℃,rhodochrosite was decomposed to MnO and CO2.When the temperature was higher than 600 ℃,dolomite in rhodochrosite was decomposed into CaCO3,MgO and CO2.At the same time,MgO reacted with a small amount of MnO to form magnesium manganese oxides.When the temperature reached 800 ℃,CaCO3 was decomposed to form CaO and CO2.The research results could provide reference for the development and utilization of rhodochrosite in Tongren area.
万方数据
维普
