Article
Chemistry, Applied
Deliang Meng, Meng Wang, Zongyu Feng, Chao Xia, Yanyan Zhao, Xiaowei Huang
Summary: This study aims to analyze the phase change behavior of Baotou mixed rare earth concentrate during oxidative roasting at 450-800 degrees Celsius. The results show that with the increase of roasting temperature, the decomposition of bastnaesite in the concentrate becomes more complete, leading to a decrease in the leaching rate of La during the subsequent HCl leaching process.
JOURNAL OF RARE EARTHS
(2022)
Article
Chemistry, Analytical
Lina Qiu, Jiandi Li, Weiwei Zhang, Aijun Gong, Xiaotao Yuan, Yang Liu
Summary: The study investigated the extraction and back-extraction effects of TODGA on various rare earth elements, achieving optimal experimental conditions by adjusting parameters. The results showed that TODGA had good separation effects on La(III), Ce(III), Pr(III), Nd(III), and mixed rare earths.
Article
Chemistry, Applied
Dan Zou, Hailian Li, Ji Chen, Deqian Li
Summary: This study investigates the extraction of Ce and F from bastnaesite, determining the extraction mechanisms of the complex system and discovering synergistic and antagonistic effects between B-F and Ce(IV)-F. The results show that adding H3BO3 can improve the recovery of Ce and F while reducing environmental pollution.
JOURNAL OF RARE EARTHS
(2021)
Article
Metallurgy & Metallurgical Engineering
Arsyad Maulana Dzulqornain, Ana Belen Cueva-Sola, Kyeong Woo Chung, Jin-Young Lee, Rajesh Kumar Jyothi
Summary: This study presents a hydrometallurgical process for the separation of light rare earth elements (LREEs) using oxidation, precipitation, solvent extraction, and stripping techniques. Selective oxidation with potassium permanganate was employed for the separation of cerium (III). Solvent extraction with Cyanex 572 and cross-current scrubbing were used to achieve the separation of lanthanum (III) from neodymium (III) and praseodymium (III).
Review
Chemistry, Physical
Chang Liu, Longhua Xu, Jiushuai Deng, Jia Tian, Donghui Wang, Kai Xue, Xi Zhang, Yan Wang, Jinmei Fang, Jiongtian Liu
Summary: Rare earth elements are indispensable and valuable for scientific and technological advancements in the 21st century, making the extraction of high-quality rare earth resources a global priority. Bastnasite-(Ce) is a significant rare earth mineral, and research efforts have focused on separating it from gangue minerals using the flotation process, with flotation reagents playing a critical role. This paper provides a detailed summary of current research on the behavior of bastnasite-(Ce) flotation agents on minerals and their interaction with mineral surfaces during flotation separation, and outlines future prospects for further research.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Environmental
Guoqiang Li, Siqi Chai, Guojie Zhang, Jun Liu, Yongfa Zhang, Yongkang Lv, Ying Wang, Yuqiong Zhao
Summary: In this study, Ce-modified Cu-based carbon materials (Cu-Ce/AC) were prepared and used as catalysts for the catalytic wet air oxidation (CWAO) degradation of phenol wastewater. The research found that the stability of Cu-Ce/AC catalyst was weaker in acidic environment and maintained high activity in alkaline environment. The incomplete degradation intermediate products accumulated and blocked the active sites of the catalyst, leading to its deactivation. Additionally, a redox cycle between Cu and Ce was observed during phenol degradation, promoting the formation of oxygen vacancies and enhancing the degradation process.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Shuainan Ni, Hepeng Zhang, Chenhao Liu, Yun Gao, Hao Su, Xiaoqi Sun
Summary: This study aims to improve the extraction process for efficient and clean extraction of rare earths from ion-absorbed rare earth deposits. The extraction-precipitation strategy based on long-chain saturated fatty acids as precipitants successfully recovered rare earths from the leach solutions. This strategy offers advantages in terms of low cost, simplicity, high efficiency, sustainability, and low energy consumption.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Materials Science, Multidisciplinary
Wen-Cheng Gao, Jian-Kang Wen, Biao Wu, He Shang, Xue Liu
Summary: In this study, a novel approach using a KHSO4-H2SO4 system was experimentally studied for leaching valuable metals from low-grade niobium-bearing ore. The results showed that the roasting KHSO4-H2SO4-ore system is an effective method to extract Nb, Y and Ce with high recovery rates. The leaching kinetics of the calcined Nb-bearing ore in oxalic acid solution was successfully modeled by a chemical reaction model.
Article
Chemistry, Multidisciplinary
Zhen Zhang, Rui Li, Chuanglong Guo, Xueling Chen, Junmei Sun, Yonggang Zhi, Bo Zhang
Summary: In this study, a novel extractant HA was synthesized and showed excellent performance in extracting rare-earth metals. FT-IR spectroscopy revealed that all REs were loaded as REs(A)(3). Stripping test demonstrated that HA is an effective extractant and can effectively strip the loaded REs.
Article
Chemistry, Multidisciplinary
Aditya Ranjan Ray, Sujata Mishra
Summary: Modern scientific progress has made rare earth elements more important due to their specific chemical and physical properties. Proper handling and recovery of valuable products like rare earths will address environmental and societal issues caused by mining and industrial waste.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2023)
Article
Engineering, Environmental
Lin Wang, Huan Li, Jiabai Cai
Summary: Microplastics are emerging contaminants in ecology and environment. Wet air oxidation (WAO) technology has the potential to degrade microplastics. This study investigated the degradation of three common microplastics (PE, PS, and PET) in WAO experiments and confirmed the advantage and potential of WAO in controlling the release of microplastics from sludge to the environment.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Applied
Ye Zhang, Yong Gao, Peng Wang, Duo Na, Zhenming Yang, Jinsong Zhang
Summary: SiC foam is a promising material for extraction reactors in the field of rare earths extraction and separation. This study designed a static mixer reactor based on SiC foam and investigated the structure-performance relationship using experimental and computational fluid dynamics (CFD) simulation. The results demonstrate that SiC foam exhibits superior extraction and mass transfer performance, making it a suitable candidate for efficient and high-throughput extraction and separation of rare earths.
JOURNAL OF RARE EARTHS
(2022)
Article
Chemistry, Multidisciplinary
Xingjie Wang, Kieran Brunson, Haomiao Xie, Ian Colliard, Megan C. Wasson, Xinyi Gong, Kaikai Ma, Yufang Wu, Florencia A. Son, Karam B. Idrees, Xuan Zhang, Justin M. Notestein, May Nyman, Omar K. Farha
Summary: New Ce12V6 oxo clusters with different capping ligands were designed and synthesized, showing enhanced solubility and catalytic activity compared to the nonporous Ce12V6-SO4. The introduction of organic ligands improved the accessibility of catalytic sites and influenced the electronic environment, affecting the reactivity of the cluster. This study provides a strategy to fully utilize the catalytic sites within inorganic sulfate capped clusters through the introduction of organic ligands.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Engineering, Chemical
Lu Xing, Hanmeng Yuan, Xifei Ma, Hongshuai Gao, Yi Nie
Summary: This study successfully achieved the selective separation of neodymium (Nd) from light rare earth elements (LREEs) using three designed phosphate-functionalized ionic liquids. The synthesized ILs showed high extraction efficiency for Nd and maintained a high extraction capacity even after recycling. The density functional theory analysis revealed the interaction mechanism between the ILs and rare earth elements.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Environmental
Jie Cheng, Hong-Yi Li, Dong Hai, Xin-Mian Chen, Jiang Diao, Bing Xie
Summary: In order to minimize the toxicity of vanadium extraction tailings, the vanadium extraction efficiency should be as high as possible. This study explores the kinetics of a novel magnesiation roasting technique for vanadium slag, revealing the microscopic mechanism and proposing macroscopic kinetic models. The intensified roasting kinetics achieved a vanadium extraction efficiency of 96.65%, providing guidelines for the industrial application of this technique.
JOURNAL OF HAZARDOUS MATERIALS
(2023)