Article
Metallurgy & Metallurgical Engineering
Pablo Ortega-Tong, James Jamieson, Benjamin C. Bostick, Andy Fourie, Henning Prommer
Summary: Electrokinetic in situ leaching (EK-ISL) is a novel mining technology that aims to recover copper from orebodies without physical excavation, thereby reducing the environmental impact of mining. The formation of secondary layers is a critical issue affecting the efficiency of copper sulphide leaching. This study characterized the formation of secondary leaching products under EK-ISL conditions and found that the sustained dissolution of polysulphides during leaching exposes new mineral surfaces, leading to enhanced copper recovery.
Article
Engineering, Chemical
G. T. Mohanraj, M. R. Rahman, S. B. Arya, Ranju Barman, P. Krishnendu, Sher Singh Meena
Summary: This study conducted characterization studies on low grade copper ore and optimized the leaching parameters and solvent extraction method to achieve efficient copper recovery.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Engineering, Chemical
Ankit Verma, David R. Corbin, Mark B. Shiflett
Summary: The study found that three oxalate reagents can effectively extract aluminum and iron, and selectively precipitate them through hydrolysis of the aqueous phase and acidification of the filtrate, as well as recover the aqueous acid using a cation-exchange resin, providing an energy-efficient, cost-effective, and environmentally friendly closed-loop process for extracting Al and Fe from bauxite ore.
Article
Chemistry, Physical
Jinjia Du, Yanqiong Zhang, Jiajia Lu, Jin Chen, Lei Gao, Shenghui Guo, Mamdouh Omran, Guo Chen
Summary: This study introduced microwave technology combined with pyrite in order to efficiently leach manganese elements from low-grade manganese ore. The microwave leaching method achieved a leaching rate of 98.6% under optimal conditions, while conventional leaching methods only achieved 92.0%. The kinetic behavior of manganese leaching was found to be describable by the chemical reaction control model.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Chemistry, Multidisciplinary
Abdul Hapid, Siti Zullaikah, Adji Mahfud, Adji Kawigraha, Yanto Sudiyanto, Ratika Benita Nareswari, Armando T. Quitain
Summary: The recovery of gold from refractory ore is crucial for the sustainable development of the gold industry. Current research focuses on the pretreatment of refractory gold ore using microwave-assisted roasting, investigating the effects of microwave power, additives, and water on the oxidation and decomposition of sulfide minerals. This method allows for high oxidation and low sulfur emissions.
ARABIAN JOURNAL OF CHEMISTRY
(2024)
Article
Environmental Sciences
Qiang Song, Min Zhang, Wen Zhong, Zhipeng Yin, Chuanyong Jing
Summary: This study investigated the leachability mechanism of tungsten (W) from tungsten ore processing residue (TOPR) using characterization techniques and leaching experiments. The results showed that the dissolved Fe concentration was positively correlated with W leachability, while Ca concentration was negatively correlated. Additionally, organic acids significantly improved the bioaccessibility of W from TOPR.
Article
Engineering, Chemical
Hector M. Lizama
Summary: Copper dump leaching involves irrigating run-of-mine ore with acidic solution to generate aqueous cupric ions. Despite the large size of the ore particles being leached, the process is effective due to particle breakage, continuous generation of fines, and fresh mineral surfaces for leaching. The rate of copper leaching in dumps is determined by the rate of fines generation and leaching of the fines.
MINERALS ENGINEERING
(2021)
Article
Engineering, Chemical
Xiaoyi Shen, Hongmei Shao, Yan Liu, Yuchun Zhai
Summary: The study investigated the processing of nickel-chromium mixed metal oxidized ore through (NH4)2SO4 roasting followed by water leaching, achieving high metal extraction efficiencies. The transformation of mineral phases at different temperatures and the different reaction mechanisms were identified.
MINERALS ENGINEERING
(2021)
Article
Environmental Sciences
Shunda Lin, Lei Gao, Yong Yang, Renlong Liu, Jin Chen, Shenghui Guo, Mamdouh Omran, Guo Chen
Summary: Microwave heating is used to enhance the efficiency of Mn2+ extraction from pyrolusite. The optimized leaching conditions resulted in a higher extraction rate compared to conventional heating, and microwave heating was found to change the process and direction of chemical reactions, reducing reaction time.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Chemical
Hao Wu, Yali Feng, Haoran Li, Hailong Li, Jinrong Ju
Summary: By adding sodium carbonate, the oxidation rate of pyrite in the gold self-leaching process was improved, leading to an enhancement in gold extraction efficiency. The buffering capacity of sodium carbonate can prevent thiosulfate decomposition and increase thiosulfate concentration.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Borbor A. K. K. Gibson, Glen Nwaila, Jochen Petersen
Summary: The study on synthetic silver ore revealed that the inner-particle pores were not continuous, and coarse particle leaching extraction was limited to near-surface regions, resulting in low extraction rates. Utilizing coarse synthetic particles for leaching could be a potential deterministic technique for understanding reaction performance in coarse particle heap leaching.
MINERALS ENGINEERING
(2021)
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
Chemistry, Analytical
Zixuan Bai, Xiaosheng Zhao, Jun Zhang, Fangfang Wu, Quan Tang
Summary: In order to improve the utilisation of uranium resources and reduce the radioactive contamination of uranium slag by Ra-226, the effects of various factors on uranium-radium co-leaching from uranium ore were investigated. The optimal conditions for nitric acid agitation leaching were found to be 80 mesh ore, 4 mol L-1 nitric acid, 40 degrees C, and 4 hours with a liquid-to-solid ratio of 3, resulting in uranium leaching rate of >99% and radium leaching rate of >93% with low standard deviations of <0.04% and <0.7% respectively. Thus, this approach enables simultaneous high-rate leaching of uranium and radium.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2023)
Article
Environmental Sciences
Prashant Ram Jadhao, Ashish Pandey, K. K. Pant, K. D. P. Nigam
Summary: The study utilized a hydrometallurgical approach to extract copper and nickel from waste printed circuit boards of mobile phones, achieving efficient recovery through ammonia-ammonium sulfate leaching. Optimal reaction parameters were identified and kinetic modeling was used to determine the rate-controlling step for metal extraction, ultimately leading to high-purity copper recovery.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Review
Chemistry, Physical
Manuel Saldana, Edelmira Galvez, Pedro Robles, Jonathan Castillo, Norman Toro
Summary: This paper provides an introduction to the theoretical background of mathematical modeling in the leaching process of copper minerals, summarizes the scientific literature on technological developments and representative mathematical models, and identifies the challenges and potential contributions of comprehensive models representing the dynamics of copper mineral leaching.
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.