Article
Multidisciplinary Sciences
Weiwei Wang, Zhangkuang Peng, Chunlei Guo, Qiang Li, Yanjiang Liu, Shaochun Hou, Hailong Jin
Summary: The aim of this study was to characterize the riebeckite type rare earth ore found in the Bayan Obo deposit and identify the distribution and occurrence of rare earths and gangue species within the ore. The analysis revealed that the primary rare earth minerals in the ore were bastnaesite and monazite, with huanghoite, parisite, aeschynite, and fergusonite identified as secondary rare earth minerals. The ore was rich in rare earth oxides with a 3.81 wt % grade, and potential methods for recovering rare earths from this ore have been identified.
Article
Chemistry, Applied
Peng Zu, Jie Li, Jingxuan Wu, Wenhao Zhang, Jiawei Lin, Shiwen Yi, Wenrou Su
Summary: This study investigates the roasting process of Bayan Obo rare earth concentrates mixed with Na2CO3. The phase change process and kinetic mechanism of each firing stage are analyzed. The results provide valuable insights for the recovery of elements and optimization of the production process.
JOURNAL OF RARE EARTHS
(2022)
Article
Metallurgy & Metallurgical Engineering
De-liang Meng, Xiao-wei Huang, Zong-yu Feng, Meng Wang, Chao Xia, Yan-yan Zhao
Summary: The thermal decomposition behavior of Bayan Obo mixed rare earth concentrate (BOMREC) under nitrogen atmosphere was studied to provide fundamental research for advanced technology in its metallurgy. The results showed that during roasting at 500-550 degrees C, there was approximately 10% mass loss and an activation energy of 148 kJ/mol. After roasting at 550 degrees C for 2 hours, bastnaesite in BOMREC completely decomposed into rare earth oxides and fluorine oxides, with a maximum cerium oxidation efficiency of 0.58% and a maximum leaching efficiency of REEs at 49.1% after thermal decomposition at 600 degrees C for 2 hours.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Article
Engineering, Chemical
Yan Zhou, Jianxing Liu, Gongjin Cheng, Xiangxin Xue, He Yang
Summary: This study investigated the selective concentration of Fe and rare earth minerals in Bayan Obo tailings through carbothermal reduction followed by sulfuric acid leaching. Results showed that under specific conditions, efficient metallization and magnetic separation of Fe and RE minerals can be achieved.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Environmental Sciences
Chen Zhao, Jianye Yang, Xingguang Zhang, Xin Fang, Nan Zhang, Xiong Su, Hui Pang, Wuyuntana Li, Fenghong Wang, Yunxia Pu, Yuan Xia
Summary: This study investigated and analyzed the exposure and health risks of rare earth elements in Bayan Obo mining area in China. The results showed that the contribution of food intake to health risks is low, but other exposure routes need further attention.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2023)
Article
Geochemistry & Geophysics
Burakhan Ersoy, Mehmet Umut Besirli, Selim Topal, Belma Soydas Soezer, Firat Burat
Summary: Rare earth elements (REE) are essential for various industries, and China is currently the world's largest supplier. This study focused on the material characterization and beneficiation of Malatya/Kuluncak rare earth ore. The results showed important indications about the behavior of REE-bearing minerals, which is significant for reducing China's influence on the REE market.
Article
Geology
Hai-Dong She, Hong-Rui Fan, Kui-Feng Yang, Xiao-Chun Li, Zhan-Feng Yang, Qi-Wei Wang, Li-Feng Zhang, Zhen-Jiang Wang
Summary: The Bayan Obo deposit, with its giant rare earth reserves, still lacks a unified understanding of the rare earth and niobium-bearing mineral evolution and mineralization stages due to the complicated metallogenic process. Through systematic studies of mineralogical composition and paragenesis, it was revealed that rare earth minerals transition from phosphate minerals to fluorcarbonate minerals before appearing in Ba-fluorcarbonate minerals. Niobium mineralization is found in the form of disseminated grains with no clear paragenetic relationship with other minerals. Geochemical data show positive anomalies of Ba and Nb, and negative anomalies of U, Ta, Sr, Zr and Y in all types of rocks and ores, indicating a continuous change in REE, Nb and Th content from coarse dolomitic facies to massive mineralization. Vein mineralization is considered to be the result of re-precipitation by Paleozoic fluids without the addition of exogenous metallogenic materials from the Mesoproterozoic igneous carbonatite.
ORE GEOLOGY REVIEWS
(2021)
Article
Metallurgy & Metallurgical Engineering
Jieliang Wang, Peng Zu, Shiwen Yi, Zhao Cao
Summary: Bayan Obo ore contains high levels of rare earth and fluorite, making it difficult to efficiently separate using conventional magnetic separation and flotation. A stepwise magnetic separation process can achieve high-purity preconcentrates, improving efficiency for subsequent flotation separation.
MINING METALLURGY & EXPLORATION
(2021)
Article
Geology
Chun-wan Wei, Cheng Xu, Miao Deng, Wen-lei Song, Aiguo Shi, Zhuoqi Li, Chaoxi Fan, Guangxi Kuang
Summary: The Bayan Obo REE-Fe-Nb deposit is the largest light rare earth element (REE) deposit in the world, which has experienced serious hydrothermal reworking processes. A detailed mineralogical and geochemical investigation on apatite from a drill core in the Bayan Obo deposit revealed that metasomatic fluids in the deposit originated from different sources, including Silurian Bainaimiao arc plutons and sedimentary materials. The variations in apatite types and isotopic compositions point to complex mineral assemblages and geochemical features in the deposit.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Yun-Xiang Zhan, Xiao-Chun Li, Bin Wu, Kui-Feng Yang, Hong-Rui Fan, Xian-Hua Li
Summary: The Bayan Obo deposit in China is the largest rare earth elements (REE) resource in the world. This study identifies four types of heavy REE (HREE)-rich minerals in the deposit and determines their HREE contents. The HREE-rich minerals are primarily precipitated from carbonatite-related fluids and occur in close association with light REE minerals, indicating no strong LREE-HREE fractionation. Approximately 25-57% of HREE can be hosted in the identified minerals, suggesting their significance for future HREE exploitation in the deposit.
ORE GEOLOGY REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Yifan Chai, Yingjie Fan, Zhichao Li, Jiayi Wu, Yunhao Zhang, Yici Wang, Guoping Luo, Shengli An
Summary: The reduction process of pellets prepared from Bayan Obo iron ore concentrate was explored using thermogravimetric experiments and kinetic calculations. The reason for the abnormal swelling of these pellets was analyzed from a kinetics perspective. The results showed that carbon deposition, interfacial chemical reaction, and internal diffusion controlled the three stages of reduction.
Article
Metallurgy & Metallurgical Engineering
Yingjie Fan, Yunhao Zhang, Zhichao Li, Yifan Chai, Yici Wang, Guoping Luo, Shengli An
Summary: This study investigates the swelling behavior of pellets prepared from Bayan Obo iron ore concentrate during the reduction process, providing valuable insights into the reduction swelling theory of pellets prepared from complex intergrowth minerals.
IRONMAKING & STEELMAKING
(2021)
Article
Geology
Xiao-Chun Li, Hong-Rui Fan, Xi Zeng, Kui-Feng Yang, Zhan-Feng Yang, Qi-Wei Wang, Hong-Tao Li
Summary: The Bayan Obo deposit in China is home to the largest rare earth elements (REE) resource in the world. The genesis of this deposit is still in debate due to uncertainties surrounding the mineralization age. Zircon grains found in the REE ore of Bayan Obo have unique compositional features and textures, suggesting a hydrothermal origin and providing important evidence for determining the timing of REE mineralization.
ORE GEOLOGY REVIEWS
(2021)
Article
Geochemistry & Geophysics
Chun-wan Wei, Miao Deng, Cheng Xu, Anton R. Chakhmouradian, Martin P. Smith, Jindrich Kynicky, Wen-lei Song, Wei Chen, Bin Fu
Summary: The formation and depositional events of the Bayan Obo giant rare earth element (REE) deposit have undergone dynamic recrystallization and decarbonation, and are related to the reaction with subduction fluids, without the need for external REE input.
Article
Chemistry, Physical
Jing Guo, Ming Wen, Jie Li, Xunhai Hong, Wenhao Zhang, Yonglun Wang
Summary: This study investigated the fluorine fixation of Bayan Obo rare-earth iron ores using different sodium agents under the action of microwaves. The results showed that sodium bicarbonate was the most effective sodium agent, and the optimal conditions for the fluorine fixation process were determined. These findings have important implications for the development of green and economic recovery processes for Bayan Obo rare-earth iron ores.
PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING
(2022)
Article
Polymer Science
Guangtan Fan, Renliang Lyu, Xiao Gao, Cheng Liang, Cunwen Wang
JOURNAL OF APPLIED POLYMER SCIENCE
(2018)
Article
Chemistry, Multidisciplinary
Yanju Qiu, Sufang Chen, Cunwen Wang, Renliang Lyu, Daohong Zhang, Chengchao Liu, Yuhua Zhang, Jinlin Li
NEW JOURNAL OF CHEMISTRY
(2017)
Article
Materials Science, Composites
Lichun Wang, Gangwei Pan, Renliang Lyu
PLASTICS RUBBER AND COMPOSITES
(2020)
Article
Chemistry, Applied
Renliang Lyu, Ting Xia, Cheng Liang, Cheng Zhang, Zeqin Li, Lichun Wang, Yi Wang, Ming Wu, Xiaogang Luo, Jiayu Ma, Cunwen Wang, Caili Xu
CARBOHYDRATE POLYMERS
(2020)
Article
Chemistry, Physical
Renliang Lyu, Cheng Zhang, Ting Xia, Sufang Chen, Ze Wang, Xiaogang Luo, Lichun Wang, Yi Wang, Junxia Yu, CunWen Wang
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2020)
Article
Chemistry, Physical
Yaqi Gong, Liming Liu, Fen Wang, Ying Pei, Shilin Liu, Renliang Lyu, Xiaogang Luo
Summary: Aminated chitosan/cellulose nanocomposite microspheres were successfully prepared for low concentration SMX removal, achieving high removal efficiency and analyzing the adsorption mechanism through kinetic and isothermal models. The stability and adsorption performance of ACNM were verified through cycling and column adsorption experiments.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Materials Science, Ceramics
Ruizhen Liu, Qing Wang, Ping Li, Huaiyuan Jiang, Binglin Mai, Liuyong Zhao, Zhiqi Zhang, Yutian Fan, Jian Cheng, Renliang Lyu
Summary: Ternary-structured photocatalysts composed of Bi2MoO6 nanosheets, graphite-carbon nitride quantum dots (g-CNQDs), and SiO2 photonic crystals (PCs) were prepared to enhance light utilization and photocatalytic activity. The photocatalytic activity of Bi2MoO6/g-CNQDs/SiO2 PCs was 5.56 times higher than that of pure Bi2MoO6 when the photonic band gap (PBG) of PCs was located near the absorption peak of g-CNQDs. This study provides a new approach to construct highly active multiple-structured photocatalysts and confirms the significant enhancement of photocatalyst activity through precisely tuned band gap PCs.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Caili Xu, Ting Xia, Ping Li, Jianfei Yin, Liu Chen, Sufang Chen, Ru'an Chi, Qingwen Han, Xiaogang Luo, Renliang Lyu
Summary: In this study, novel modified mesoporous silica absorbents were prepared and used to treat glyphosate wastewater. The results showed that the adsorption material could effectively remove glyphosate in water. This work provides guidance for the modification and application of mesoporous silica in pesticide wastewater treatment.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Ping Li, Huaiyuan Jiang, Qing Wang, Ruizhen Liu, Yutian Fan, Ru'an Chi, Jian Cheng, Renliang Lyu
Summary: A ternary-structured photocatalyst of g-CNQDs/TNTs on PCs was fabricated successfully to achieve higher photodegradation efficiency of dyes in wastewater. The optimized hydrothermal compositing conditions were 160 degrees C for 20 h and with a loading ratio of 1:8 of g-CNQDs to TNTs. The photodegradation performance of g-CNQDs/TNTs and g-CNQDs/TNTs/PCs was significantly enhanced by the synergistic effect of quantum dots and PCs.
NEW JOURNAL OF CHEMISTRY
(2023)
