Article
Geosciences, Multidisciplinary
Kaushik Mitra, Eleanor L. L. Moreland, Greg J. J. Ledingham, Jeffrey G. G. Catalano
Summary: In situ rover investigations on Mars have discovered manganese oxides as fracture-filling materials. Previous studies interpreted these minerals as indicators of atmospheric oxygen on early Mars. By contrast, the authors propose that the oxidation of manganese by oxygen is unlikely due to slow reaction kinetics and suggest oxyhalogen species as more plausible manganese oxidants on Mars. Experimental results show that oxyhalogen species induce substantially greater manganese oxidation rates than O-2 and precipitate the manganese oxide mineral nsutite, similar to dark manganese accumulations on Mars.
Article
Multidisciplinary Sciences
Xing Jin, Jinxiang Fu, Pengfei Yu, Di Luo
Summary: A new filter material called MOFCC was introduced and characterized for its ability to treat high concentrations of manganese from aqueous solutions. The removal of Mn(II) was found to be over 95.51% during a 30-day filtration experiment, indicating that MOFCC can effectively adsorb and oxidize manganese without the need for a start-up period. The surface properties of MOFCC were analyzed, and its specific surface area and pore size were determined to be 38.76 m2 g-1 and 3-40 nm, respectively. MOFCC has great potential as a manganese removal filter material for water treatment plants.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Analytical
Xu Zhao, Hongyang Xia, Yucheng Su, Hongqiang Wang, Eming Hu, Fang Hu, Zhiwu Lei, Qingliang Wang, Chunze Zhou, Boyuan Zheng, Pengfei Hu
Summary: This study investigated the removal of beryllium from uranium beryllium ore wastewater using hydrochloric acid pretreated activated carbon (H-AC). The adsorption efficiency of beryllium was found to be 99% under the conditions of pH = 5, adsorbent dosage of 2 g/L, and temperature of 25°C. The study also analyzed the impact of various coexisting ions on the adsorption capacity of H-AC, and the results demonstrated that the presence of these ions did not affect the adsorption of beryllium by H-AC. This research provides a new approach for removing beryllium from industrial wastewater and suggests that H-AC could be a potential adsorbent for this purpose.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2023)
Article
Chemistry, Analytical
M. S. Nagar, W. M. Morsy
Summary: The percolation technique was used to examine the leachability of uranium from El-Sela uranium mineralization, with various factors affecting the kinetics of uranium leaching studied and optimal operational parameters identified. The column leaching experiment's validity was confirmed through data fitting at the end of the study.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2021)
Article
Chemistry, Analytical
Xu Zhao, Hongyang Xia, Yucheng Su, Hongqiang Wang, Eming Hu, Fang Hu, Zhiwu Lei, Qingliang Wang, Chunze Zhou, Boyuan Zheng, Pengfei Hu
Summary: This study investigated the removal of beryllium from uranium beryllium ore wastewater using hydrochloric acid pretreatment activated carbon. The results showed that under suitable conditions, the pretreated activated carbon had a high adsorption capacity for removing beryllium from the wastewater.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2023)
Article
Engineering, Environmental
J. Magdalena Santana-Casiano, David Gonzalez-Santana, Quentin Devresse, Helmke Hepach, Carolina Santana-Gonzalez, Birgit Quack, Anja Engel, Melchor Gonzalez-Davila
Summary: The study investigated the iron(II) oxidation kinetic process in coastal seawater of the Macaronesia region, revealing deviations between measured and calculated values under different environmental conditions, largely attributed to the characteristics of organic matter.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Nuclear Science & Technology
Sheng Zeng, Yuan Shen, Bing Sun, Kaixuan Tan, Shuwen Zhang, Wenhao Ye
Summary: The fractal characteristics of the pore structure of uranium-bearing sandstone were studied, and their influence on the uranium leaching kinetics was analyzed. Fractal kinetic models for predicting the in-situ leaching kinetics were established based on the relationship between the fractal dimension of the sample's pore structure and the dissolution rate.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Pierre Trinh, Alesya Mikhailovskaya, Gregory Lefevre, Nadege Pantoustier, Patrick Perrin, Elise Lorenceau, Benjamin Dollet, Cecile Monteux
Summary: The hypothesis suggests that aqueous foams can be an effective medium for metal oxidation due to the transport properties of the reactants. The experiments confirmed that the dissolved copper mass exhibits a non-monotonic relationship with the foam liquid fraction. Through analytical modeling, it was found that this behavior is due to the competition between the advective flux of H+ ions and the diffusion of O2 through thin liquid films. This study provides insights for optimizing the structure and drainage flow in reactive foams.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Environmental
Hanquan Zhang, Guanhua Chen, Xiang Cai, Jintao Fu, Mingxia Liu, Pengfei Zhang, Hong Yu
Summary: A novel method for extracting copper and iron from Pyrite cinder was proposed in this paper, and promising results were obtained in the experiments. The maximum copper leaching recovery reached 82.18% under optimized conditions, and a high-quality iron concentrate was obtained subsequently from the leaching residuals through magnetic separation. The leaching process was controlled by mixed diffusion and chemical reaction, with an activation energy of 27.97 kJ/mol.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Shiyao Fan, Qi Xin, Yahui Zhang, Xu Zhao, Xinwei Liu, Xuanzhang Hao, Eming Hu, Hongqiang Wang, Junwen Lv, Zhiwu Lei, Qingliang Wang
Summary: This study proposed a new method for efficient and clean release of uranium and zirconium from hazardous uranium purification waste streams. By using alkali disaggregation coupled with acid leaching, the structure of the waste slag was destroyed, exposing the target elements. Under optimized conditions, the leaching rates of uranium and zirconium were enhanced to 99.12% and 96.77%, respectively, while the content of uranium and zirconium in the slags decreased significantly, meeting the internationally required clean release standard.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Environmental Sciences
Chongsheng Lu, Wei Xiu, Huaming Guo, Guoxi Lian, Bing Yang, Tianjing Zhang, Erping Bi, Zheming Shi
Summary: Although the mechanisms of uranium (U) mobilization and oxygen (O-2) consumption in the in situ leaching (ISL) of U in sandstone have remained unclear, this study found that the introduction of CO2 and O-2 efficiently stimulated U mobilization in the mining aquifer. The dissolution of carbonate minerals promoted by injected CO2 enhanced the formation of uranyl carbonate and facilitated U mobility. The results also emphasized the importance of increasing O-2 utilization efficiency to improve the performance of ISL operations.
WATER RESOURCES RESEARCH
(2023)
Article
Engineering, Environmental
Guiwei Li, Yuanyuan Zhao, Guangyu An, Baoyou Shi
Summary: This study investigated the effect of Fe(III) and Al(III) hydrolysis products on Mn(II) oxidation by free chlorine. The results showed that Fe3+ and Al-13 significantly catalyzed Mn(II) oxidation and formation of MnOx particles. The catalytic capacity of Al-13 aggregates was weaker compared to MnOx and Fe(OH)(3). Organic matter was identified as the main factor contributing to the lower Mn(II) oxidation rate.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Review
Engineering, Chemical
Atefeh Azizitorghabeh, Jingxiu Wang, Juliana A. Ramsay, Ahmad Ghahreman
Summary: Thiocyanate is a promising alternative gold lixiviant with low toxicity compared to cyanide, but its commercialization has been hindered by the higher redox potential required for the process. Gold leaching using thiocyanate is an electrochemical reaction that requires an oxidant, mainly ferric, and a specific molar ratio of oxidant to thiocyanate for efficient gold oxidation kinetics. Recovery of solubilized gold-thiocyanate species from the pregnant leach solution can be achieved through various methods, such as activated carbon adsorption and ion exchange.
MINERALS ENGINEERING
(2021)
Article
Engineering, Chemical
Ying Xu, Limin Wang, Xuebin Su, Meifang Chen, Wensheng Liao, Yu Ren, Zhiming Du, Ye Ding
Summary: In response to the issues of high acid consumption, blockage caused by iron ion precipitation, and low leaching rate in conventional acid leaching of sandstone-type uranium deposits, the author proposed research on low-acid and oxygen leaching technology. The study analyzed and investigated the oxidation mechanism of ferrous ion under acidic conditions, the factors influencing the ferrous ion oxidation process, the kinetic simulation of oxygen oxidizing uranium minerals, and the interaction of uranium and iron precipitation in acidic solution. The study explored the mechanism of oxygen oxidizing uranium and uranium leaching under low acid conditions. The results showed that under low acidity, the kinetics of ferrous oxidation by oxygen is between first-order and second-order reaction, reducing iron ion precipitation and improving uranium leaching rate. This study confirms the feasibility of oxygen oxidation of uranium and uranium leaching under low acidity conditions, providing valuable guidance for effectively leaching uranium deposits with high acid consumption.
Article
Metallurgy & Metallurgical Engineering
Dmitry Valeev, Denis Pankratov, Andrei Shoppert, Artem Sokolov, Alexandr Kasikov, Alexandra Mikhailova, Cristian Salazar-Concha, Ilia Rodionov
Summary: The chemical and mineral compositions of bauxite from Severoonezhsk Bauxite Mine in Russia were analyzed, with the discovery of iron-containing minerals such as alumogoethite, alumohematite, alumoakaganeite, and chromite. The extraction efficiency of iron from bauxite by HCl leaching was found to be 82.5%, with aluminum loss below 4.5% and diffusion identified as the limiting stage in the process. The residue after leaching contained traces of certain iron oxides, with a decrease in chromium and calcium oxides, and the iron chloride liquor contained rare earth elements.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Metallurgy & Metallurgical Engineering
Michael J. Nicol
Article
Metallurgy & Metallurgical Engineering
Kojo T. Konadu, Ryotaro Sakai, Diego M. Mendoza, Chitiphon Chuaicham, Hajime Miki, Keiko Sasaki
Article
Engineering, Chemical
Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Shigeto Kuroiwa, Yuji Aoki
MINERALS ENGINEERING
(2020)
Article
Metallurgy & Metallurgical Engineering
Keishi Oyama, Kazuhiko Shimada, Jun-ichiro Ishibashi, Keiko Sasaki, Hajime Miki, Naoko Okibe
Article
Engineering, Chemical
Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki
MINERALS ENGINEERING
(2020)
Article
Metallurgy & Metallurgical Engineering
Michael Nicol
Summary: The study used an electrochemical method to measure the oxidative dissolution rates of chalcopyrite, finding higher rates in chloride solutions and a limited effect of solution nature. Additionally, temperature was shown to have a significant impact on dissolution rates.
Article
Geochemistry & Geophysics
Yoshiyuki Tanaka, Hajime Miki, Gde Suyantara, Yuji Aoki, Tsuyoshi Hirajima
Summary: The study investigates the floatability of copper-molybdenum (Cu-Mo) ores in Chilean copper porphyry deposits and the behavior of blended ores in seawater. It was found that the recovery of copper and molybdenum decreases with the increasing copper oxidation degree, and the recovery of blended ore can be predicted using the flotation rate equation. Additionally, the total copper and molybdenum recovery are strongly affected by the degree of copper oxidation, as the mineral fraction in the ore varies greatly depending on the oxidation degree.
Article
Engineering, Chemical
Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Shigeto Kuroiwa, Yuji Aoki
Summary: The research shows that the treatment with PAX and Na2SO3 may enable the separation of chalcopyrite and enargite, with higher recovery rates for enargite in flotation.
MINERALS ENGINEERING
(2021)
Article
Geochemistry & Geophysics
Yuki Semoto, Gde Pandhe Wisnu Suyantara, Hajime Miki, Keiko Sasaki, Tsuyoshi Hirajima, Yoshiyuki Tanaka, Yuji Aoki, Kumika Ura
Summary: In this study, sodium metabisulfite (MBS) was used for selective flotation of chalcopyrite and molybdenite. Results showed that MBS treatment significantly depressed the floatability of chalcopyrite and slightly reduced the floatability of molybdenite. Additionally, the addition of diesel oil or kerosene could significantly improve the separation efficiency of selective flotation of chalcopyrite and molybdenite using MBS treatment. These findings provide insights into the mechanism underlying the selective depressing effect of MBS on the flotation of chalcopyrite and molybdenite.
Article
Engineering, Chemical
Gde Pandhe Wisnu Suyantara, Yuki Semoto, Hajime Miki, Tsuyoshi Hirajima, Keiko Sasaki, Daishi Ochi, Yuji Aoki, Daniyarov Berdakh, Kumika Ura
Summary: The flotation behavior and surface properties of chalcopyrite after treatment with sodium metabisulfite (SMBS) in the presence of calcium ions were investigated. The results showed that both SMBS treatment and the addition of calcium hydroxide (Ca(OH)(2)) had a depressing effect on the floatability of chalcopyrite, which was reduced in the presence of potassium amyl xanthate (PAX). However, the combination of SMBS treatment and Ca(OH)(2) resulted in a significant decrease in the recovery of chalcopyrite.
Article
Engineering, Chemical
Keiko Sasaki, Ikumi Suyama, Yuji Aoki, Kojo T. Konadu, Chitiphon Chuaicham, Hajime Miki, Tsuyoshi Hirajima, Tsuyoshi Hirajima
Summary: Environmentally friendly ligands, such as thiourea (TU) and ethylene thiourea (ETU), were used to examine the leaching characteristics of gold from different types of gold ores. The study found that TU leaching was most effective for the lowest Fe-bearing gold ore, while ETU leaching was more difficult for the highest Fe-bearing gold ore. The addition of Na2SO3 improved Au extraction from Fe-rich gold ores by reducing Fe3+ to Fe2+. ETU also formed more stable complexes with Au compared to TU, making it a potential alternative for cyanide-free leaching.
MINERALS ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Yoshiyuki Tanaka, Hajime Miki, Gde Pandhe Wisnu Suyantara, Yuji Aoki, Hideyuki Okamoto, Kumika Ura, Tsuyoshi Hirajima
Summary: The effects of pH and precipitations on copper-molybdenum ore rougher flotation in seawater were investigated. The results showed that the effect of pH on maximum recovery of copper and molybdenum flotation was limited, but it had a significant influence on the kinetic constant. The precipitation effect in seawater was found to be limited below pH 9. Turbidity measurements and XRD analysis confirmed the presence of precipitations, mainly CaCO3, CaSO4, and Mg(OH)2, even at pH below 9. The influence of turbidity on maximum recovery was limited, while its effect on kinetic was more pronounced. These findings suggest that the precipitation effect needs to be considered more for flotation kinetic in seawater flotation.
MATERIALS TRANSACTIONS
(2023)
Article
Geochemistry & Geophysics
Ahmed M. Elmahdy, Hajime Miki, Keiko Sasaki, Mohsen Farahat
Summary: The effect of microwave pre-treatment on the magnetic properties of tennantite and enargite was investigated. Magnetic susceptibility, XRD, and XPS characterization were conducted to explore the changes in their magnetic properties. Magnetic separation of chalcopyrite binary mixtures with enargite and tennantite was performed, showing significant arsenic rejection rates of 84.2% and 76.3% respectively.
Article
Mining & Mineral Processing
Gde Pandhe Wisnu Suyantara, Daniyarov Berdakh, Hajime Miki, Tsuyoshi Hirajima, Keiko Sasaki, Daishi Ochi, Yuji Aoki
Summary: This study investigated the effect of hydrogen peroxide treatment on the flotation behavior of chalcocite and enargite. The results showed that hydrogen peroxide treatment can reduce the floatability of chalcocite and enargite, and it can also selectively separate these two minerals.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Environmental
Gde Pandhe Wisnu Suyantara, Intan Nurul Rizki, Akbarshokh Ulmaszoda, Hajime Miki, Keiko Sasaki
Summary: Chalcopyrite flotation can be selectively depressed by oxidation treatment. The presence of ferric oxyhydroxide on the surface of chalcopyrite after oxidation treatment is a key factor in depressing chalcopyrite flotation. Goethite (α-FeOOH) nanoparticles were found to physically adsorb on the chalcopyrite surface and render it hydrophilic, thereby reducing the chalcopyrite flotation recovery.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
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).
Article
Metallurgy & Metallurgical Engineering
Bo Chen, Shenxu Bao, Yimin Zhang
Summary: This study investigated the effects of Al, Fe, P, Si and Na on the precipitation characteristics of vanadium in the ultrasound precipitation system. The concentration upper limits and the negative influence on the precipitation kinetics were determined for each impurity. The findings provide theoretical and technical support for the industrial application of ultrasound precipitation technology.
Article
Metallurgy & Metallurgical Engineering
Chunlin He, Mingwei Qi, Yun Liu, Zunzhang Liu, Yuezhou Wei, Toyohisa Fujita, Guifang Wang, Shaojian Ma, Wenchao Yang, Junyuan Gan
Summary: In this study, D201 x 7 resin and tartaric acid were used as materials and complexing agents for the separation of germanium from sulfuric acid solution. The study successfully achieved the separation of germanium and demonstrated the high selectivity and adsorption performance of the resin.
Article
Metallurgy & Metallurgical Engineering
Xiaobo Zhu, Yue Liu, Chen Ma, Wang Li
Summary: A selective and highly effective method for the extraction and separation of V(IV) and Fe(III) using N235 and P507 as solvent extractants is proposed. The pH, composition, and concentration of the extractant mixture have significant effects on the extraction efficiency and separation factor. The mixing of P507 and N235 generates the P507 monomer, which enhances the extraction efficiency and weakens the stability of vanadium containing extraction complex. Cation exchange process forms the extraction complexes.
Article
Metallurgy & Metallurgical Engineering
B. Behnajady, J. Yousefi Seyf, S. Karimi, M. Moradi, M. Sohrabi
Summary: Deep eutectic solvents (DES) have potential as environmentally-friendly solvents for recovering metals from spent lithium-ion batteries (LIBs). Experimental and molecular dynamics simulation results showed that the chloride ions in DES can form complexes with lithium, manganese, and nickel ions, facilitating their extraction.
Review
Metallurgy & Metallurgical Engineering
Sebastian Kinas, Dorota Jermakowicz-Bartkowiak, Anna Dzimitrowicz, Piotr Cyganowski
Summary: The high demand for platinum-group metals (PGMs) and Re in economical and industrial applications related to environmental protection and energy conversion/storage has led to resource scarcity. Thus, it is crucial to recover and recycle these rare metals. This study critically reviews the recent progress in the effective recovery of PGMs and Re from materials relevant to sustainable technologies, emphasizing practical aspects, environmental impact, and issues related to the unit processes of recovery.
Article
Metallurgy & Metallurgical Engineering
Guopeng Yang, Qinggang Li, Guiqing Zhang, Mingyu Wang, Zuoying Cao, Wenjuan Guan, Jiawei Du, Shengxi Wu
Summary: The study proposes an efficient, clean, and economical process for recovering V2O5 from titanium-white waste through hydrogen peroxide stripping and precipitation of vanadium products by heating. Experimental results show that the use of D2EHPA as a modifier prolongs the duration of maximum stripping efficiency, enabling continuous operation.
Article
Metallurgy & Metallurgical Engineering
Guisu Yu, Shuainan Ni, Yun Gao, Ditang Mo, Zhiyuan Zeng, Xiaoqi Sun
Summary: This research proposes a novel green process for the selective recovery of rare earth elements (RE) from spent NdFeB permanent magnet using hydrophobic deep eutectic solvent (HDES). Through optimization of extraction conditions and stripping method, efficient and clean separation and recovery have been achieved.
Article
Metallurgy & Metallurgical Engineering
Jia Li, Xinsheng Wu, Xiaozhou Zhou, Li Zeng, Shengxi Wu, Mingyu Wang, Wenjuan Guan, Zuoying Cao, Qinggang Li, Guiqing Zhang
Summary: This paper presents a complete hydrometallurgical route for the full-component utilization of deep-sea polymetallic nodules (DPN), achieving high recovery efficiency and near-zero waste production with low energy consumption.
Article
Metallurgy & Metallurgical Engineering
Sanae Elmisaoui, Abderrazak M. Latifi, Lhachmi Khamar
Summary: A first principles model is developed to describe the dissolution mechanism of phosphate ore particles in a solution of phosphoric acid. The model accounts for non-uniform size of ore particles using particle size distributions and quantifies their influence on the model predictions. A global estimability analysis is carried out to determine the estimable parameters from experimental data, and the predictions show good agreement with the experimental data. The computed activation energy indicates that diffusion is the rate limiting step of the dissolution process.
