Article
Engineering, Chemical
Zheng Li, Koen Binnemans
Summary: The study found that the extraction performance of the C923/FeCl3 system is opposite to that of the TBP/FeCl3 system, mainly due to C923's strong extraction of Fe leading to a low concentration of [FeCl4](-), C923 in combination with IL strongly extracting Mg, and C923 extracting Mg by solvation, resulting in insufficient C923 concentration for Li extraction.
Article
Chemistry, Analytical
Hany Lotfy Weheish, Sherien Hussien Ahmed, Abdou Ali Abdou, Ahmed Hussien Orabi, Wagiha Hamed Mahmoud
Summary: Solvent impregnated silica gel material with the neutral phosphine oxide extractant cyanex-923 in toluene was successfully prepared for thorium recovery from aqueous nitrate solutions. The optimized conditions led to efficient thorium recovery, and the impregnated solid phase was validated for practical application.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2021)
Article
Metallurgy & Metallurgical Engineering
Jinrong Ju, Yali Feng, Haoran Li, Chenglong Xu, Shunliang Liu
Summary: In this paper, a solvent extraction-oxalic acid precipitation process was studied for the efficient recovery of vanadium, nickel, and aluminum from the acid leaching solution of spent hydrodesulfurization catalyst. The process conditions for extracting vanadium with Cyanex 272 and precipitating nickel using oxalic acid were explored. The results showed high extraction efficiency for vanadium and selective extraction of nickel from the solution containing a high concentration of aluminum. The proposed flowsheet may provide a new idea for the comprehensive recovery of valuable metals.
MINING METALLURGY & EXPLORATION
(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
Engineering, Chemical
Ziwen Ying, Manxing Huo, Guixuan Wu, Jie Li, Yun Ju, Qifeng Wei, Xiulian Ren
Summary: This study aimed to recover vanadium and chromium from the leaching solution of sodium roasting vanadium slag. EHEHPA was found to be the most suitable extractant for vanadium extraction, with a recovery rate of 99.91%. The study also investigated the effects of different parameters on the vanadium extraction process and the extraction mechanism.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Mustapha A. Raji, Alafara A. Baba, Abhilash
Summary: This study examined the extraction of uranium from sulphate pregnant solution using Cyanex (R) 272 in kerosene diluent. The parameters affecting the extraction mechanism, including Cyanex (R) 272 concentrations and equilibrium pH, were investigated. The results showed that under optimized conditions (0.3 mol/L Cyanex (R) 272, 27 +/- 2 degrees C, equilibrium pH range of 3-4), an extraction efficiency of 97.1 +/- 3% U(VI) could be achieved. Maximum stripping of U(VI) from the loaded organic phase was achieved using a 0.5 mol/L Na2CO3 solution, and the uranium was recovered as sodium diuranate.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2023)
Article
Engineering, Chemical
Alexandre Silva Guimaraes, Marcelo Borges Mansur
Summary: Selective solvent extraction of Mg and Ca from Ni-rich sulfate solutions was studied using different extractive systems. It was found that by adjusting the pH and concentration of the extractants, selective separation of Mg and Ca from Ni can be achieved.
MINERALS ENGINEERING
(2022)
Article
Engineering, Chemical
Amilton Barbosa Junior Botelho, Denise Crocce Romano Espinosa, Jorge Alberto Soares Tenorio
Summary: The study aimed at separating scandium and zirconium from Brazilian bauxite residue through acid leaching and solvent extraction experiments, achieving high separation factors after optimizing various process parameters.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Moheddine Wehbie, Guilhem Arrachart, Tamir Sukhbaatar, Xavier F. Le Goff, Iyad Karame, Stephane Pellet-Rostaing
Summary: The newly synthesized extractants showed higher efficiency in extracting uranium from sulfate media, with successful quantitative recovery of uranium after extraction.
Article
Metallurgy & Metallurgical Engineering
Jiashu Yao, Yali Li, C. Srinivasakannan, Jianfeng Ran, Shiwei Li, Shaohua Yin, Libo Zhang
Summary: This work proposes a solvent extraction process for removing chloride in slag flush wastewater. The effectiveness of the process was validated through experiments, and the number of stages required was predicted. A suitable stripping agent was used to increase the chloride concentration to facilitate precipitation.
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
Engineering, Chemical
Vera V. Belova, Yulia V. Tsareva, Yulia A. Zakhodyaeva, Vladimir K. Ivanov, Andrey A. Voshkin
Summary: A new extraction system containing a mixture of Cyanex 272 and caprylic acid was proposed for the extraction and separation of lanthanides(III) with high level of extraction ability and capacity. It was shown that the composition of the synergistic mixture of Cyanex 272-caprylic acid established demonstrates highly efficient separation of rare-earth metal ions, especially for La(III). The efficiency of lanthanum(III) extraction was affected by the pH changes in the aqueous phase.
Article
Chemistry, Multidisciplinary
Raja Norimie Raja Sulaiman, Norul Fatiha Mohd Noah, Norasikin Othman, Norela Jusoh, Muhammad Bukhari Rosly
Summary: The study demonstrated the effective extraction and reduction of toxic hexavalent chromium (Cr(VI)) from electroplating wastewater using a novel synergistic solvent extraction method with a mixture of organophosphorus acidic extractants Cyanex 272 and Cyanex 302. The organic phase could be reused up to 11 times for excellent extraction and stripping, showing stable performance over multiple cycles. The synergistic extraction system improved Cr(VI) extraction and reduced chemical consumption in the organic phase.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Nathalia Vieceli, Thomas Ottink, Srecko Stopic, Christian Dertmann, Thomas Swiontek, Claudia Vonderstein, Reiner Sojka, Niclas Reinhardt, Christian Ekberg, Bernd Friedrich, Martina Petranikova
Summary: This study aims to investigate the recovery of cobalt from spent lithium-ion batteries using solvent extraction. A real chloride-based solution obtained after the removal of manganese was used. By considering the effect of several variables, a model was developed to optimize the separation of cobalt and nickel. The results showed that 98% extraction efficiency for cobalt can be achieved in 1 to 2 extraction stages with low co-extraction of nickel (<5%) when using 0.6-0.8 M Cyanex 272, O:A ratio below 1, and pH below 5.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
Tirath Raj, K. Chandrasekhar, Jungsu Park, Sunita Varjani, Pooja Sharma, Deepak Kumar, Jeong-Jun Yoon, Ashok Pandey, Sang-Hyoun Kim
Summary: The leaching of cobalt and nickel into water streams has negative environmental and human health impacts. This study focuses on developing cost-effective and environmentally friendly technologies for recovering these heavy metals. Two new fatty acid-based ionic liquids were synthesized and successfully used to extract cobalt and nickel from aqueous solutions.
Article
Engineering, Chemical
Benjamin De Castro, Mostafa Benzaazoua, Soumali Roychowdhury, Aurelie Chopard, Francis Quintal Lauzon, Benoit Plante
Summary: This study proposes an innovative method using deep learning algorithm and reflected light optical imaging to automatically detect all particles and minerals in acrylic resin polished sections. The experimental results show that this method can accurately detect all mineral particles, including transparent minerals, under reflected light optical microscopy, and provide unbiased mineralogical quantification.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Qiushi Song, Xinyu Du, Changlu Shan, Hongwei Xie, Zhiqiang Ning, Kai Yu
Summary: This study investigated the effect of magnetic stirring on the microstructure of Co deposits during electrowinning in a chloride solution. It was found that magnetic stirring effectively reduced the negative influence of H2 bubbles on the structure of Co deposits and changed their nucleation and growth behavior, resulting in the preparation of high-quality columnar Co crystals.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Tao Ge, Xiaowei Zhou, Liang Xu, Yan Sun, Cheng Yang, Yongpan Tian, Zhuo Zhao
Summary: In this study, the extraction performance and complexation mechanism of p-di-ethyl-amino-methylthiacalix[4]arene (L) towards Pt(IV) were investigated. The results indicated that L had excellent complexation ability towards Pt(IV) and could selectively extract it from a solution containing multiple competing ions.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Yuan Li, Dirk van Zyl
Summary: This paper presents a modified Kynch's approach to explain the hindered settling behavior of suspensions impacted by segregation. The experimental data and predicted results confirm the effectiveness of the proposed method.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Yi Fang, Aurora Robledo-Cabrera, Changsheng Peng, Shan Huang, Qi Xiao, Alejandro Lopez-Valdivieso
Summary: With the assistance of mechanical ball milling, the partially oxidized micro-sponge iron (micro-Fe0@Fe2O3) achieves significantly improved removal of Cr(VI) across a broad pH range. Mechanical force eliminates the surface oxide layer and exposes the Fe0 core, leading to sustained reduction of Cr(VI). The efficiency of micro-Fe0@Fe2O3 is strongly influenced by dissolved oxygen, with higher DO resulting in the generation of stable reductant Fe(II) under acidic conditions, while DO consumption hinders the reduction of Cr(VI) under alkaline conditions due to increased pH. Parameters of ball milling operation, especially rotation speed, have a significant impact on the removal of Cr(VI).
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Alton F. Grabsch, Phillip D. Fawell, Michael G. Davies
Summary: High molecular weight partially hydrolysed polyacrylamide (PHPA) is commonly used in mineral exploration drilling to increase fluid viscosity and help maintain the suspension of fine particles. However, clarifying these suspensions can be difficult, and previous studies have found that anionic flocculants are ineffective. This study confirmed that nonionic flocculants can successfully aggregate the particles, indicating that the charged tails of adsorbed PHPA prevent anionic flocculants from accessing the particle surfaces.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
J. S. Guiral-Vega, L. Perez-Barnuevo, J. Bouchard, A. Ure, E. Poulin, C. Du Breuil
Summary: This paper introduces an approach that combines particle properties and process modeling to describe the behavior of iron ore in a laboratory-scale drum-type magnetic separator. Early information on iron ore processing behavior can be obtained through laboratory testing, automated mineralogy analysis, and process modeling.
MINERALS ENGINEERING
(2024)
Review
Engineering, Chemical
Sayed Janishar Anzoom, Ghislain Bournival, Seher Ata
Summary: This review discusses the benefits and challenges of coarse particle flotation, as well as recent developments in improving the process. Coarse particle flotation has various applications and offers advantages in technical, economic, and sustainability aspects. However, it also faces challenges such as particle detachment, transfer between phases, and persistence in the froth phase. Technological advancements, such as fluidized-bed flotation and processes enhancing bubble-particle attachment, have shown promising results in efficiently recovering larger particles.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Yimei Xiao, Jinchan Feng, Bingqiao Yang, Huihua Luo, Fang Zhou
Summary: In this study, the use of fulvic acid as a depressant for the flotation separation of chalcopyrite from arsenopyrite was investigated. It was found that fulvic acid strongly depressed arsenopyrite while having little influence on chalcopyrite flotation. The addition of calcium hypochlorite facilitated the adsorption of fulvic acid on arsenopyrite surface.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Bo Hao, Minqiang Fan
Summary: Particle-bubble attachment is crucial in coal and mineral flotation processes. In this study, the attachment process of low-rank coal particles to the bubble surface was simulated, revealing the important role of water film rupture in particle attachment.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Shuwei Wu, Shuai Wang, Guoqiang Wang, Longfei Fan, Jianbo Guo, Zhengbin Liu, Haoyan Zhang, Wei Guan, Yukuan Wang, Yewei Wu
Summary: This study analyzes the motion mode of eccentric roller crushers and proposes a calculation method for productivity. Through laboratory experiments, the results indicate that the proposed method can effectively estimate the productivity of eccentric roll crushers.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Hanna Miettinen, Malin Bomberg, Ozlem Bicak, Zafir Ekmekci, Paivi Kinnunen
Summary: Mineral processing requires large amounts of water, and reducing water consumption through recirculation and closing water loops is important. However, this can lead to the accumulation of contaminants in the process water, which can negatively affect the process performance. In this study, the impact of microorganisms on flotation performance was investigated, and ion exchange was evaluated for removing dissolved sulfur species and microorganisms from water. The results showed that adding microorganisms had a positive effect on flotation selectivity, especially for nickel. Different water types, process water and final tailings water, behaved slightly differently. Ion exchange proved to be effective in removing sulfur species and microorganisms, and dissolved air flotation was a successful pretreatment for ion exchange in removing microorganisms.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Canneng Chen, Song Zhang, Quanjun Liu, Luzheng Chen, Yongjun Xian, Yijie Wang
Summary: This study introduces the use of ultrasonic pretreatment to enhance the flotation separation of elemental sulfur and silver-bearing lead minerals from ultrafine residue. The results show that ultrasonic pretreatment effectively liberates associated sulfur and improves the separation of sulfur and silver-bearing lead minerals. Under optimized conditions, ultrasonic pretreatment significantly improves the recovery and grade of sulfur in the concentrate, as well as the recovery of lead and silver in the tailings.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Genzhuang Li, Fisher Wang, Bern Klein, Michael Deal, Aaron Wright, Hector Mezquita
Summary: This paper presents a stress-based approach for predicting and improving large-scale HIG mill performance through experimental testing and model calibration.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Runpeng Liao, Shuming Wen, Jian Liu, Shaojun Bai, Qicheng Feng
Summary: This study demonstrates that the use of a DDA/DDTC mixed collector system can significantly improve the flotation performance of smithsonite. The synergistic effect between DDA and DDTC is confirmed, and the mixed collector system contributes to a decrease in solution surface tension. The use of FT-IR and XPS confirms the simultaneous physisorption and chemisorption of DDA and DDTC on the smithsonite surface, and contact angle measurements show that the mixed collector effectively enhances the hydrophobicity of smithsonite. Molecular dynamics simulations reveal the multilayer adsorption of DDTC and DDA on the smithsonite surface, with DDTC promoting the adsorption of DDA.
MINERALS ENGINEERING
(2024)