Article
Chemistry, Applied
Sheng Chang, Mei Li, Kai Gao, Dongliang Zhang, Haijun Duan, Linlin Ma, Zheng Ruan
Summary: The study investigated the mechanism of phthalic acid as a dicarboxylic acid collector in the flotation separation of fluorite and rare earth minerals. Experimental data showed that phthalic acid could efficiently separate the two minerals under weakly acidic conditions. The adsorption mechanism analysis revealed the formation of stable polycyclic calcium phthalate complex on the surface of fluorite.
JOURNAL OF RARE EARTHS
(2022)
Review
Engineering, Chemical
Peng Cen, Xue Bian, Zhannian Liu, Manyi Gu, Wenyuan Wu, Baokuan Li
Summary: Rare earth elements play an indispensable role in modern high technology, making the efficient exploitation and utilization of rare earth resources crucial. Current industrial processes are chemical and energy intensive, leading to negative impacts on the environment, thus further improvement towards cleaner production is necessary.
MINERALS ENGINEERING
(2021)
Article
Chemistry, Applied
Hongli Fan, Xianglin Yang, Jing Qi, Guangyi Liu, Jingqin Qin
Summary: This study investigated the flotation performance of bastnaesite using three phosphate collectors, with DEHPA showing the best flotation recovery. The research also suggested that DEHPA likely reacts with the Ce(III) atoms of bastnaesite interface to generate Ce-O-P bonds, aiding in the enrichment of bastnaesite through flotation.
JOURNAL OF RARE EARTHS
(2021)
Article
Chemistry, Applied
Hongcheng Zhang, Dairui Xie, Heng Zhang, Meng Jiang, Hao Huang, Yu Wan, Yang Liao, Shilin Zhao
Summary: The study investigated the mechanism of fluorine conversion to BF4- in sulphuric acid solution from bastnaesite using E-h-pH diagram and simulation experiments. The results showed that pH has a significant effect on the formation and hydrolysis of BF4-, while the presence of rare earth elements influences the formation of BF4- through LaF3 and HF-2.
JOURNAL OF RARE EARTHS
(2021)
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
Chemistry, Applied
Zhao Cao, Zeyu Cheng, Jieliang Wang, Yongdan Cao
Summary: This study investigates the effect of Ca2+ ions and sodium silicate individually or in combination on bastnaesite flotation. The results show that the combination of Ca2+ ions and sodium silicate more severely depresses bastnaesite due to their synergistic effect.
JOURNAL OF RARE EARTHS
(2022)
Article
Engineering, Chemical
Peng Liu, Zhihao Guo, Weidi Zhang, Mengjie Tian, Wei Sun
Summary: In this study, a novel hydroxamic acid NHOO was synthesized and used as a collector in bastnaesite flotation to address the challenges faced in the separation from associated gangue minerals like fluorite. The results showed that NHOO exhibited effective selectivity in neutral conditions, achieving a significant difference in recoveries between bastnaesite and fluorite during their separation. Zeta potential characterization, adsorption tests, and X-ray photoemission spectroscopy confirmed higher adsorption quantities of NHOO on bastnaesite surface compared to fluorite.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Chemistry, Applied
Shuchen Sun, Ying Yang, Ganfeng Tu, Faxin Xiao
Summary: The bastnaesite mineral was defluorinated through a steam roasting process, achieving separation from rare earth by removing fluorine in the form of hydrogen fluoride. The study investigated the effects of raw material particle size, roasting temperature, and time on the defluorination rate of bastnaesite. The optimal conditions for the steam roasting process were found to be a particle size less than 74 μm, a roasting temperature of 1000 degrees Celsius, and a roasting time of 4 hours.
JOURNAL OF RARE EARTHS
(2022)
Article
Engineering, Chemical
Chenhao Liu, Hepeng Zhang, Bing Luo, Liqing Li, Xiaoqi Sun
Summary: The extraction-precipitation method using N-lauroyl sarcosine as the precipitant shows a specific precipitation ability for rare earth, and a new enrichment process for bastnaesite leachate is developed to effectively remove impurities and reduce energy consumption and carbon emission.
MINERALS ENGINEERING
(2022)
Article
Chemistry, Physical
Qingmin Nie, Tingsheng Qiu, Huashan Yan, Yonggai Li
Summary: In this study, an eco-friendly depressant polyepoxysuccinic acid (PESA) was used for the flotation separation of bastnaesite from fluorite. The results showed that PESA had a strong depression effect on fluorite while having a negligible impact on bastnaesite. The addition of PESA also impeded the adsorption of octyl hydroxamic acid (OHA) on fluorite surface, which confirmed the selective depressant effect of PESA.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Chemical
Emmy Muhoza, Kayla Gibson, Wencai Zhang, Seyed Hassan Amini
Summary: This study developed an environmentally benign flotation reagent scheme using organic acids to enhance bastnaesite flotation while selectively depressing calcite. The results demonstrated the potential of organic acids as effective calcite depressants in the bastnaesite flotation system.
MINERALS ENGINEERING
(2023)
Article
Engineering, Chemical
Mohammed Hakkar, Fatima Ezzahra Arhouni, Ahmed Mahrou, Essaid Bilal, Martin Bertau, Amit Roy, Gerald Steiner, Nils Haneklaus, Hamid Mazouz, Aziz Boukhair, Mohammed Benjelloun
Summary: Adding fly ash and silica can enhance the transfer of rare earth elements from phosphate rock to phosphoric acid during wet phosphoric acid production.
MINERALS ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Sourav Pramanik, Soumik Mondal, Alexander Chinarev, Nicolai V. Bovin, Jaideep Saha
Summary: The reaction repertoire for forming transient aziridinone or azaoxyallyl cations from α-halohydroxamate is extended to design Kdo-glycosyl donors by installing the hydroxamate moiety at an anomeric center, which is highly effective for stereoselective access to β-Kdo glycosides. The pivotal roles of hydroxamate over amide are revealed in control experiments.
CHEMICAL COMMUNICATIONS
(2023)
Article
Engineering, Chemical
Zhihao Guo, Sultan Ahmed Khoso, Jinggang Wang, Chenyang Zhang, Zhiyong Gao, Wei Sun, Mengjie Tian, Yuling Liu
Summary: This manuscript investigates the performance and interaction mechanism of 2-hydroxy-3-naphthyl hydmxamic acid (2-OH-3-NHA) and 1-hydroxy-2-naphthyl hydmxamic acid (1-OH-2-NHA) as flotation collectors for the separation of bastnaesite/fluorite. The results show the excellent selectivities of NHAs and the better selectivity of 1-OH-2-NHA than 2-OH-3-NHA. Zeta potential measurements and first-principles calculations provide insights into the adsorption behavior and selectivity.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Physical
Zhihao Guo, Mengjie Tian, Gongming Qian, You Zhou, Zhiyong Gao, Wei Sun
Summary: This study investigated the flotation separation of bastnaesite and fluorite, two important minerals containing light rare earth elements (LREEs). Styrylphosphonic acid (SPA) and cinnamohydroxamic acid (CHA) were used as the collectors. The results showed that SPA and CHA exhibited certain selectivities, with CHA having stronger collecting ability but poorer selectivity compared to SPA. The adsorption mechanisms of SPA and CHA on the surfaces of bastnaesite and fluorite were also examined using various tests and calculations.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Materials Science, Multidisciplinary
Chao Wang, Hui Xu, Weiping Liu, Pengcheng Han, Xiyun Yang, Xuming Wang
Article
Geochemistry & Geophysics
Ying Lu, Weiping Liu, Xuming Wang, Huaigang Cheng, Fangqin Cheng, Jan D. Miller
Article
Geochemistry & Geophysics
Lei Pan, Sean Golden, Shoeleh Assemi, Marc Freddy Sime, Xuming Wang, Yuesheng Gao, Jan Miller
Summary: Respirable coal mine dust particles, especially the nano-sized fraction, can cause severe lung diseases in coal miners, and the characterization of these particles in terms of size and chemical composition is still ongoing.
Article
Chemistry, Physical
Jiaqi Jin, Pranay Asai, Xuming Wang, Jan D. Miller, Milind Deo
Summary: Water flow in nanopores is influenced by pore wettability and interfacial water properties. Simulations showed enhanced water flow and a positive slip length at hydrophobic surfaces, while hydrophilic surfaces exhibited zero flow velocity. The presence of a water exclusion zone and differences in slip lengths between simulation and experimental results were observed.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Energy & Fuels
Jiaqi Jin, Chen-Luh Lin, Shoeleh Assemi, Jan D. Miller, Darryl P. Butt, Taylor Jordan, Milind D. Deo, Viktoriya Semeykina
Summary: The study simulated fluid flow through nanopore structures using pressure-assembled colloidal silica spheres and characterized them using X-ray computed tomography. The nanopore networks exhibited pore size distributions corresponding to the particle sizes, but the simulated permeability was lower than experimental values, highlighting the need to consider the complex packing and surface chemistry issues of silica spheres in future research.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Jiaqi Jin, Shoeleh Assemi, Hassnain Asgar, Greeshma Gadikota, Thang Tran, William Nguyen, John D. McLennan, Jan D. Miller
Summary: The strength and hardness of naturally consolidated HNTs depend on the presence of impurities, with about one-third of the porosity attributed to inter-HNT pores. The pore network information is crucial for investigating the effects of surface characteristics on confined fluid flow.
Article
Geochemistry & Geophysics
Weiping Liu, Jan Dean Miller, Wei Sun, Yuehua Hu
Summary: This article examines the improvement in selectivity during the flotation of pyrite and gold by adding MTP. The adsorption of MTP and DTP is studied using density functional theory and molecular dynamics simulation. The results show that replacing the collector can improve gold recovery.
Article
Geochemistry & Geophysics
Shoeleh Assemi, Lei Pan, Xuming Wang, Titilayo Akinseye, Jan D. Miller
Summary: Nanoparticles with a size below 100 nm in respirable coal mine dust (RCMD) may have significant adverse health effects by penetrating deep into the lung and triggering oxidative stress formation and inducing inflammation. Researchers used a particle separation technique to analyze RCMD nanoparticles collected from an underground mine in the United States. The study provides valuable data on the size, morphology, and composition of RCMD nanoparticles below 100 nm.
Article
Engineering, Chemical
Weiping Liu, Jan D. Miller, Wei Sun, Yuehua Hu
Summary: CaF2 has limited electrokinetic sensitivity to fluoride ions in solution, and the positive CaF2 surface charge is not reversed at high fluoride ion concentration. FTIR-IRS results show that AgCl/water interface has a water structure-breaking tendency, while CaF2/water interface has a structure-making tendency. The speculation that strong hydrogen bonding between fluoride ions and water prevents the accommodation of excess fluoride ions at surface lattice sites of fluorite is examined by molecular dynamics simulations (MDS) in this study.
MINERALS ENGINEERING
(2023)
Review
Metallurgy & Metallurgical Engineering
Weiping Liu, Yujie Zhao, Junfeng Chen, Muhammad Azam, David Asubonteng, Michael Ngoie, Shangyong Lin, Wei Sun
Summary: Copper concentrates are commonly used in smelting operations worldwide, but they often contain hazardous impurities, such as fluorine ions, which can lead to various complications during the smelting process. This comprehensive review evaluates current techniques for removing fluorine from copper concentrate and analyzes the advantages and disadvantages of existing methods. The review provides valuable insights into the current state of fluorine removal from copper concentrates and serves as a practical guide for researchers and industry professionals.
MINING METALLURGY & EXPLORATION
(2023)
Article
Chemistry, Physical
Chen Zhang, Xuming Wang, Jiaqi Jin, Lixia Li, Jan D. Miller
Summary: Most slip length measurements have been made on synthetic or modified synthetic materials, with few reports on unmodified natural mineral surfaces. Slip length measurements were conducted on the silica face surfaces of talc and mica using atomic force microscopy (AFM). Results showed contrasting slip length conditions between the hydrophobic silica surface of talc and the hydrophilic silica surface of mica.
COLLOIDS AND INTERFACES
(2021)
