| Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences | Host |
| Citation: |
WANG Weiwei, LI Erdou, HOU Shaochun, GUO Chunlei. Research on Occurrence State of Iron and Rare Earth in Mica Type Iron Ore in Bayan Obo[J]. Conservation and Utilization of Mineral Resources, 2020, 40(5): 44-48. doi: 10.13779/j.cnki.issn1001-0076.2020.07.009
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Research on Occurrence State of Iron and Rare Earth in Mica Type Iron Ore in Bayan Obo
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Abstract
The grade of TFe and REO in Bayan Obo mica type iron ore is 17.48% and 2.46%, respectively. The mineral composition of the ore is complex. The iron minerals are mainly magnetite and hematite, with a small amount of niobium, pyrite, etc. The rare-earth minerals are mainly bastnaesite and monazite. The ore structure is mainly composed of schistose structure, patchy structure and disseminated structure formed by directional arrangement of biotite. The minerals are mainly automorphic and semi automorphic granular structure, allomorphic granular structure, angular structure, metasomatic residual structure and veinlet structure. The magnetite is mostly in the form of semi automorphic to allomorphic granular crystalloblastic structure, some of which are in the form of breccia aggregate and mica. The hematite is mostly in the form of half automorphic and other granular structure, and some of hematite is embedded in gangue minerals in the form of fine grains. The bastnaesite and monazite are granular, which are closely associated with other surrounding minerals and have complex inlaying relationship. The distribution granularity of magnetite and hematite is uneven. The distribution granularity of bastnaesite and monazite is finer. Some fine-grained iron ores and rare-earth minerals are embedded in gangue minerals. Some iron ores also contain fine-grained rare-earth minerals. When the grinding fineness of -0.074 mm accounts for 90%, the monomer dissociation of magnetite, hematite, bastnaesite and monazite is only 51.54%, 58.36%, 52.27% and 63.64%, respectively. Therefore, it is an effective way to solve the problem of low concentrate grade and recovery rate by strengthening fine grinding and high efficiency separation of fine particles.
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Keywords:
- Bayan Obo /
- mica type /
- iron /
- rare earth /
- occurrence state
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References
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WANG Weiwei, LI Erdou, HOU Shaochun, GUO Chunlei. Research on Occurrence State of Iron and Rare Earth in Mica Type Iron Ore in Bayan Obo[J]. Conservation and Utilization of Mineral Resources, 2020, 40(5): 44-48. doi: 10.13779/j.cnki.issn1001-0076.2020.07.009
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Figure 1.
The magnetite which is semi-automorphic to its granular shape, some are densely disseminated
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Figure 2.
The magnetite which is disseminated in the fissures of mica and fluorite in stripes
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Figure 3.
The hematite which is disseminated with other types and fine particles
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Figure 4.
The monazite which is disseminated in the mica with fine particles
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Figure 5.
The intergrowth of niobite, bastnaesite and mica
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Figure 6.
The intergrowth of bastnaesite, magnetite and mica
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Figure 7.
The intergrowth of bastnaesite and hematite
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Figure 8.
The intergrowth of magnetite and monazite