Article
Chemistry, Multidisciplinary
Omid Marzoughi, Lin Li, Chris Pickles, Ahmad Ghahreman
Summary: This study investigates the removal of elemental sulfur from chalcopyrite concentrates and proposes toluene as a promising solvent for this process. The results show that toluene exhibits higher sulfur removal efficiency and has a minor impact on the behavior of recycled AF 5 in the leaching process. Additionally, after multiple cycles, the sulfur absorption capacity and the copper and iron leaching recoveries remain stable.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Environmental Sciences
Omid Marzoughi, Lin Li, Chris Pickles, Ahmad Ghahreman
Summary: This study investigates the use of Lanxess Lewatit(R) AF 5 catalyst to eliminate elemental sulfur during the leaching process in acidic Albion. AF 5 showed high recoveries of copper and iron, and collected 100% of the elemental sulfur. High temperature treatment successfully removed sulfur from the catalyst, and the regenerated catalyst could be reused without significant loss in sulfur absorption. The activation energy for AF 5 desulfurization was found to be 164.5 kJ/mol.
Article
Multidisciplinary Sciences
Omid Marzoughi, Chris Pickles, Ahmad Ghahreman
Summary: In this study, a series of leaching experiments were conducted to investigate the removal of elemental sulfur using Lanxess Lewatit (R) AF 5 resin. It was found that 100% of the sulfur could be adsorbed by the AF 5 resin from the acidic Albion leaching process. Adsorption isotherms were determined using Langmuir and Freundlich models, and the maximum sorption capacity of AF 5 at 95 degrees C was 488 mg/g. The kinetics of sulfur adsorption were best described by the pseudo-first order model, and the spontaneous and exothermic nature of the adsorption process was confirmed by the negative free energy and enthalpy changes.
Article
Materials Science, Multidisciplinary
Antonino Runci, John L. Provis, Marijana Serdar
Summary: The long-term corrosion behavior of reinforcing steel in alkali-activated mortars (AAMs) with different binder compositions was studied over a 360-day period. Electrochemical techniques were used to determine corrosion potential, polarisation resistance, and Tafel slopes. The study proposes new limits for passive and active corrosion in AAMs based on the time evolution of corrosion parameters.
Article
Metallurgy & Metallurgical Engineering
L. Velasquez-Yevenes, Ricardo Lasnibat
Summary: This study investigated the extraction of copper and manganese from exotic-Cu ores using cane molasses as a reducing agent in the presence of chloride ions and diluted sulfuric acid media. The presence of NaCl and cane molasses enhanced the dissolution of copper from the exotic copper ore, while the dissolution of manganese associated with copper wad was independent of the copper dissolution. Further investigation is needed on the behavior and fate of wad-associated copper.
Article
Engineering, Chemical
Leiming Wang, Shenghua Yin, Bona Deng, Aixiang Wu
Summary: The paper critically discusses the utilization of acidic seawater-based media (ASM) in copper hydrometallurgical industries, highlighting its catalytic effects in chemical/bio leaching processes. It also explores the pivotal ions and compounds present in ASM, their regeneration behavior, and the impact on redox potential, reaction activation energy, and leaching kinetics. Furthermore, the potential of ASM as an alternative to freshwater for accelerating copper sulfide leaching in water-scarce areas is highlighted based on previous studies and reviews.
MINERALS ENGINEERING
(2022)
Article
Metallurgy & Metallurgical Engineering
Rafael Padilla, Milton E. Copa, Maria C. Ruiz
Summary: Adding sodium chloride to the direct atmospheric leaching of marmatite significantly improves the zinc dissolution rate. The concentration of sulfuric acid and non-oxidative dissolution play important roles in the rate of dissolution. This research has significant implications for zinc extraction from marmatite.
Article
Green & Sustainable Science & Technology
Gautam, Satyabrata Sahoo
Summary: A comprehensive analysis was conducted to identify the best reactor configuration for CO2-activated carbon sorption systems, with reactors of different aspect ratios (AR) analyzed. The study found that the reactor with AR=7.8 showed the best performance in terms of CO2 adsorption/desorption, resulting in increased CO2 uptake and reduced maximum bed temperature compared to reactors with other ARs.
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(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).
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.
