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| Occurrence characteristics and roasting thermodynamic analysis of calcium-bearing minerals in Bayan Obo |
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Received:September 04, 2024
Revised:November 18, 2024
Accepted:January 14, 2025
Published Online:August 05, 2025
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| DOI： |
| KeyWord:Fluorite, Bayan;Obo, Process;mineralogy, Thermodynamics, Roasting |
| Author | Institution |
| Kong Xiangyan |
School of Resources and Civil Engineering,Northeastern University |
| Sun Yongsheng |
School of Resources and Civil Engineering,Northeastern University |
| Han Yuexin |
School of Resources and Civil Engineering,Northeastern University |
| Gao Peng |
School of Resources and Civil Engineering,Northeastern University |
| Ma Hongwei |
School of Resources and Civil Engineering,Northeastern University |
| Zhang Qiang |
School of Resources and Civil Engineering,Northeastern University |
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| Abstract: |
| Bayan Obo ore, a world-famous large-scale complex polymetallic mine, is not only rich in iron and rare earth resources, but also an extra-large fluorite deposit. Due to the complex composition of minerals, its efficient sorting has been a world-class problem. Exploring the occurrence characteristics of minerals is beneficial to determine the subsequent sorting process. In this paper, the occurrence characteristics of the calcium-bearing minerals in Bayan Obo ore were analyzed by multi-element analysis,XRD, SEM-EDS, MLA and other methods. The results show that calcium-bearing minerals are mainly the useful mineral fluorite, the gangue minerals calcite and ferro-dolomite, of which fluorite has a higher content of 20.105%.The ore structure of fluorite in the Bayan Obo Ore is mainly lumpy and layered structure. The fluorite is mainly embedded in the form of fine or microfine grains, which is mainly contiguous with the minerals such as hematite (pseudomorphic ore), bastnaesite, magnetite, barite and so on. Therefore the sample should be finely ground if the fluorite to be completely dissociated. Calcite and ferro-dolomite are coarse-grained intercalation, and mainly embedded in plate or granular intercalation. By calculating the Gibbs free energy results of possible reactions of calcium-bearing minerals with hydrogen or oxygen during roasting, it is known that the calcium-bearing minerals of dolomite may decompose or react with oxygen during the roasting process, while fluorite will not undergo a phase change during the roasting process. The research results provide an important basis for comprehensive recovery and utilization of fluorite in Bayan Obo area. |
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