Inorganic Chemicals Industry ›› 2024, Vol. 56 ›› Issue (6): 73-79.doi: 10.19964/j.issn.1006-4990.2023-0507

• Research & Development • Previous Articles     Next Articles

Study on mineralogical characteristics and occurrence state of elements of rhodochrosite in Tongren area

LIN Weizhi1,2(), FU Chengbing1,2(), HU Ping4, YANG Kaixu1,2, CAO Jianxin1,3()   

  1. 1.School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China
    2.Guizhou Key Laboratory for Green Chemical and Clean Energy Technology,Guiyang 550025,China
    3.Guizhou Provincial Engineering Research Center of Efficient Utilization for Waster,Guiyang 550025,China
    4.Guizhou Energy and Mineral Manganese Industry Group Co. ,Ltd. ,Tongren 554001,China
  • Received:2023-10-20 Online:2024-06-10 Published:2024-06-20
  • Contact: FU Chengbing, CAO Jianxin E-mail:1847455573@qq.com;cbfu@gzu.edu.cn;jxcao@gzu.edu.cn

Abstract:

Tongren Guizhou is located in the“Manganese Triangle” region of China.The reserves of manganese ore are abundant,mainly in the form of rhodochrosite.X-ray fluorescence spectrometer(XRF),X-ray diffractometer(XRD),simultaneous 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 pyrolysis properties of C,O,Mn,Ca and other elements in rhodochrosite.The results showed that the mass percentage of manganese 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 manganese 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.

Key words: rhodochrosite, mineralogical characteristics, occurrence state, manganese carbonate, pyrolysis characteristic

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