Article
Engineering, Chemical
Mehdi Mostajeran, Jean-Michel Bondy, Nicolas Reynier, Rory Cameron
Summary: Global demand for rare earth elements (REEs) has increased due to rapid technological advancements, leading to attention on recovery from secondary sources. Selective separation techniques like ion exchange are required to overcome challenges in recovering REEs with low metal concentration from mine wastes and tailings. This study demonstrates the first attempt at selective recovery of Sc from coal fly ash using ion exchange separation technique.
MINERALS ENGINEERING
(2021)
Article
Engineering, Environmental
Sheila Gerardo, Artur R. Davletshin, Staci L. Loewy, Wen Song
Summary: This study investigates the microscale processes controlling the recovery of rare earth elements (REEs) from coal fly ash and reveals three distinct recovery mechanisms. The study emphasizes the critical role of the morphology and elemental makeup of the ash matrix in the accessibility of REEs, providing important knowledge for the design of cost-effective and environmentally friendly REEs recovery techniques.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Applied
Bo Yang, Chen Cheng, Yuanxin Li, Wei Cheng, Jingkun Zang, Xiangping Lai, Xiaorui Wang
Summary: Rare earth elements (REY) have been found to have high content in coal, mainly existing in kaolinite, possibly in the form of adsorption. The study provides scientific references for potential extraction of associated REY in coal.
JOURNAL OF RARE EARTHS
(2022)
Article
Geology
Shuang-Liang Liu, Hong-Rui Fan, Xuan Liu, Jianyin Meng, Alan R. Butcher, Lahaye Yann, Kui-Feng Yang, Xiao-Chun Li
Summary: Rare earth elements (REE) are critical raw materials in low-carbon technologies, and the global supply is being affected by new projects. However, comprehensive data on these projects are lacking, hindering investors and policymakers. This study establishes a new REE project database, presenting the current situation and future perspectives.
ORE GEOLOGY REVIEWS
(2023)
Article
Environmental Sciences
Guoqiang Wu, Nan Shi, Tao Wang, Chin-Min Cheng, Jiawei Wang, Chunxiao Tian, Wei-Ping Pan
Summary: Coal ash has been identified as an important alternative source of rare earth elements (REEs). This study investigated the enrichment and occurrence form of REEs in coal ash, specifically in coal fly ash (CFA) from power plants. The findings revealed the higher enrichment ratio of REEs in CFA compared to ashes from muffle furnace, which was attributed to several factors including the fractionation of coal ashes, higher combustion temperature, and longer residence time of fly ash. The study also highlighted the important role of aluminum in the occurrence form of REEs in CFA. These experimental and computational results provide valuable insights for understanding the distribution of REEs in CFA and optimizing their extraction processes.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Jinhe Pan, Tiancheng Nie, Changchun Zhou, Fan Yang, Ruibo Jia, Lei Zhang, Hangtao Liu
Summary: This study examined the mechanism and effects of calcination on the occurrence and leaching of rare earth elements (REE) in coal refuse. The results showed that calcination promotes the transformation and release of REE, leading to improved leaching efficiency.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Chemical
Qi Li, Wencai Zhang
Summary: Prior research has shown that calcination pretreatment can greatly enhance the recovery of rare earth elements (REEs) from coal. This study performed sequential chemical extraction tests on raw and calcined coals to investigate the effects of calcination temperature on the occurrence modes of REEs and other selected elements. The experimental results revealed that various reactions occurred during the calcination process, which collectively determined the occurrence modes of REEs. These findings contribute to the recovery and comprehensive utilization of REEs in coal.
Article
Environmental Sciences
Yuanyuan Wang, Liuqing He, Shiyong Dong, Haoyang Fu, Gaofeng Wang, Xiaoliang Liang, Wei Tan, Hongping He, Runliang Zhu, Jianxi Zhu
Summary: This study investigated the accumulation ability of four fern species for rare earth elements (REEs) in urban areas of South China. The results showed that Dicranopteris linearis and Blechnum orientale accumulated high concentrations of REEs in their aboveground parts, making them suitable for phytoremediation in natural environments. Despite lower REE concentrations, Pteris ensiformis and Cibotium barometz can still function as phytostabilizers in urban areas. The enrichment of REEs in ferns is influenced by the availability of various nutrients. These findings provide guidelines for addressing high REE levels in urban areas.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Engineering, Chemical
Orevaoghene Eterigho-Ikelegbe, Hamza Harrar, Samson Bada
Summary: This article discusses the current status and potential strategies for recovering REEs from coal and coal discard, including the feasibility of physical beneficiation and hydrometallurgical leaching. It highlights the abundance of REEs in coal but also the need to address processing costs and knowledge gaps to advance REEs recovery from these sources.
MINERALS ENGINEERING
(2021)
Article
Energy & Fuels
Juanjuan Ma, Shuyan Li, Jinxi Wang, Shuting Jiang, Balaji Panchal, Yuzhuang Sun
Summary: This study optimized the culture conditions and bioleaching process of Aspergillus niger for the extraction of rare earth elements (REEs) from coal fly ash (CFA). It was found that organic nitrogen sources influenced the morphology and acid production capacity of A. niger, with oxalic acid being the main acid secreted (4.05 mg/L). The initial pH value was identified as the most influential factor affecting the bioleaching process, and by optimizing it, a leaching rate of 30.91% for total REEs in CFA was achieved. The main mechanism of REEs bioleaching by A. niger from CFA was speculated to be proton exchange and organic ligand complexation.
Article
Energy & Fuels
James C. Hower, Cortland F. Eble, Michelle N. Johnston, Leslie F. Ruppert, Shelley D. Hopps, Tonya D. Morgan
Summary: The Leatherwood coal in eastern Kentucky is an important energy resource in the region. The coal sample contains elements such as Ge and Ga, which are enriched near the adjacent rocks. Arsenic and other chalcophile elements are concentrated at the top and bottom of the seam profiles. Manganese enrichment is found in bright lithologies at one site. The coal samples have a light rare earth element (LREE) enrichment, while the basal lithotype has a heavy rare earth element (HREE) enrichment.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Chemistry, Multidisciplinary
K. Anand Rao, Serajuddin Md, G. RamaDevi, Sayan G Thakurta, T. Sreenivas
Summary: Fly ash from a lignite coal-based power plant in southern India was found to have a high concentration of total rare earth elements (TREE), with a significant portion of lighter rare earth elements (LREE) occurring in the form of zircon and monazite minerals. Direct leaching of the fly ash resulted in differential solubilization of LREE (50%) and heavier rare earth elements (HREE) (90%), achieving a 60% recovery of TREE under optimal conditions.
SEPARATION SCIENCE AND TECHNOLOGY
(2021)
Review
Environmental Sciences
Mory Traore, Yafei He, Yiwen Wang, Aijun Gong, Lina Qiu, Yuzhen Bai, Yang Liu, Min Zhang, Yifan Chen, Xinyu Huang
Summary: This study reviewed the content and distribution of rare earth elements (REE) in rivers and lakes in China. The sequence distribution of REE in rivers water showed a decreasing trend. Pearl River and the Jiulong River were significant reservoirs of sediments REE with higher concentrations than the global river average. The Liaohe River was one of the most polluted rivers in China, with higher REE concentrations in water.
MARINE POLLUTION BULLETIN
(2023)
Article
Engineering, Environmental
Yilin Zhang, Jiajun Yan, Jiang Xu, Chong Tian, Krzysztof Matyjaszewski, Robert D. Tilton, Gregory Lowry
Summary: A phosphate polymer nanogel (PPN) was developed for selectively recovering REEs from low REE content waste streams. The PPN exhibited high REE sorption capacity and selectivity, as well as good durability in real waste streams. This material shows potential for recovering REEs from a broad range of secondary REE stocks.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Environmental Sciences
Marcella Barbera, Pierpaolo Zuddas, Eristanna Palazzolo, Filippo Saiano
Summary: Contaminated soil can significantly affect plant growth; although enrichment of REE in the soil can induce a physiological response in plants, the amount of REE in leaves is not influenced by substrate enrichment; Light-REE are enriched by more than one order of magnitude compared to Heavy-REE in contaminated soil, indicating a specific response of plants to stress.
Article
Polymer Science
Victor A. Kusuma, Elliot A. Roth, William P. Clafshenkel, Steven S. Klara, Xu Zhou, Surendar R. Venna, Erik Albenze, David R. Luebke, Meagan S. Mauter, Richard R. Koepsel, Alan J. Russell, David Hopkinson, Hunaid B. Nulwala
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
(2015)
Article
Chemistry, Multidisciplinary
John D. Watkins, Elliot A. Roth, Michael Lartey, Erik Albenze, Mingjiang Zhong, David R. Luebke, Hunaid B. Nulwala
NEW JOURNAL OF CHEMISTRY
(2015)
Article
Chemistry, Physical
M. Lartey, J. Meyer-Ilse, D. Watkins, E. A. Roth, S. Bowser, V. A. Kusuma, K. Damodaran, X. Zhou, M. Haranczyk, E. Albenze, D. R. Luebke, D. Hopkinson, J. B. Kortright, H. B. Nulwala
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2015)
Article
Polymer Science
Hongkun He, Heesung Chung, Elliot Roth, David Luebke, David Hopkinson, Hunaid Nulwala, Krzysztof Matyjaszewski
POLYMERS FOR ADVANCED TECHNOLOGIES
(2015)
Article
Chemistry, Multidisciplinary
Anna S. Ivanova, Thomas Brinzer, Elliot A. Roth, Victor A. Kusuma, John D. Watkins, Xu Zhou, David Luebke, David Hopkinson, Newell R. Washburn, Sean Garrett-Roe, Hunaid B. Nulwala
Article
Chemistry, Multidisciplinary
Ali K. Sekizkardes, Victor A. Kusuma, Ganpat Dahe, Elliot A. Roth, Lawrence J. Hill, Anne Marti, Megan Macala, Surendar R. Venna, David Hopkinson
CHEMICAL COMMUNICATIONS
(2016)
Article
Polymer Science
Xu Zhou, Mona M. Obadia, Surendar R. Venna, Elliot A. Roth, Anatoli Serghei, David R. Luebke, Christina Myers, Zhengmian Chang, Robert Enick, Eric Drockenmuller, Hunaid B. Nulwala
EUROPEAN POLYMER JOURNAL
(2016)
Article
Energy & Fuels
Robert L. Thompson, Tracy Bank, Elliot Roth, Evan Granite
Article
Green & Sustainable Science & Technology
N. S. Siefert, S. Agarwal, F. Shi, W. Shi, E. A. Roth, D. Hopkinson, V. A. Kusuma, R. L. Thompson, D. R. Luebke, H. B. Nulwala
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2016)
Article
Energy & Fuels
Elliot Roth, Tracy Bank, Bret Howard, Evan Granite
Article
Energy & Fuels
Ronghong Lin, Bret H. Howard, Elliot A. Roth, Tracy L. Bank, Evan J. Granite, Yee Soong
Article
Energy & Fuels
Elliot A. Roth, Sushant Agarwal, Rakesh K. Gupta
Article
Polymer Science
Hongkun He, Saadyah Averick, Elliot Roth, David Luebke, Hunaid Nulwala, Krzysztof Matyjaszewski