Article
Metallurgy & Metallurgical Engineering
Wen-wen Han, Hong-ying Yang, Lin-lin Tong
Summary: This study investigated the process mineralogy of gold cyanide residues and carried out cyanide removal using three chemical methods. The results revealed that the residues primarily contained Si, S, and Fe, with pyrite being the main metallic mineral. The presence of iron-complex cyanides made the removal process difficult. The study also found that Na2SO3 oxidation method was a new and efficient approach for removing cyanide in the residues.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Engineering, Environmental
Yong-Tao Li, Wan-Ying Du, Jing-Lin Chen, Jiu-Jiang Zhang, Xin-Yue Liu, Hao Liu, Yi-Lan Zhang, Yuan-Yuan Hu
Summary: This study evaluated the feasibility of N-methyldiethanolamine (MDEA) degradation through electrochemical activation of persulfate (PS). The results showed that the dosage of PS, voltage, and initial pH had an impact on the removal rate of MDEA, and the synergistic effect between SO4-. and the three-dimensional electrochemical system increased the removal rate. In addition, kinetic analysis revealed that the degradation process followed a pseudo-first-order model and the reaction rate increased with increasing voltage.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Sivasankar Annamalai, Ardie Septian, Jiyeon Choi, Won Sik Shin
Summary: The activation of persulfate (PS) with ball-milled colloidal activated carbon (CAC(BM)) is an effective method for the degradation of phenolic compounds in soil. The CAC(BM)/PS system showed outstanding degradation performance under optimal conditions and was efficient in both spiked and field-contaminated soils.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Chemistry, Multidisciplinary
Wanqian Cai, Chongbiao Zhang, Yourong Wu, Wei Wang, Mei Lin, Tengfei Lin, Cong Lin, Min Gao, Chunlin Zhao, Xiao Wu
Summary: Waste moxa ash was modified by ball milling in hydrogen peroxide, resulting in carbon-based materials with excellent adsorption performance. These materials showed ultrafast removal of the antineoplastic drug mitoxantrone from water, with removal efficiency reaching 97.66% in 1 minute and 99.72% in 30 minutes. The study provides a simple and environmentally friendly solution for controlling mitoxantrone pollution.
Article
Engineering, Multidisciplinary
Kai Fang, Ren-dang Yang
Summary: This study utilized heat-activated carbon for the adsorption and removal of furfural from wastewater, with the air oxidation activated carbon showing good adsorption performance. The study concluded that air oxidation activated carbon could be a cost-effective adsorbent for furfural removal from wastewater.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Acong Chen, Xianghong Guan, Zijun Pang, Xiong Ke, Zhi Qin, Yao Chen, Gengrui Wei, Haizhen Wu, Guanglei Qiu, Yun Hu, Chaohai Wei
Summary: This study proposes a mechanism using copper-loaded activated carbon to effectively remove stable and persistent low-concentration total cyanides (TCNs) in wastewater. The bimetallic synergy of copper-loaded activated carbon with zinc enhances cyanide removal capacity, surpassing most reported technologies. The weakening of conjugation effect and the presence of coupled metal ions contribute to the increased removal efficiency. Orbital hybridization plays a significant role in the recombination and deconjugation of conjugated pollutants, providing a new direction for the removal of refractory pollutants.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Environmental Sciences
Preeyanghaa Mani, Youngae Kim, Sandeep Kumar Lakhera, Bernaurdshaw Neppolian, Heechul Choi
Summary: The study investigated the efficient removal of arsenic from groundwater by oxidizing it with UV activated potassium persulfate (KPS) and subsequently adsorbing it on iron oxide impregnated granular activated carbon (FeO/GAC). The results showed nearly 100% removal efficiency was achieved within 1 hour for a 10 ppm arsenic solution, with the optimal pH range being 6.0-7.0. The presence of natural contaminants did not significantly affect the removal efficiency, with over 82% of arsenic removed in 90 minutes.
Article
Energy & Fuels
Wangsheng Yu, Lei Zhang, He Xu, Hui Wang, Xu Peng, Shengji Wu, Wei Yang, Jie Zhou
Summary: Transition metal oxide-supported activated carbon prepared by non-thermal plasma treatment showed higher Hg-0 removal efficiency and stability compared to those prepared by conventional heat treatment in this study.
Article
Engineering, Environmental
Shahid Saqlain, Shufang Zhao, Soong Yeon Kim, Young Dok Kim
Summary: The study showed that pre-treating activated carbon with HNO3 can enhance toluene removal efficiency under light exposure. Shorter wavelengths of visible light were more effective in toluene removal compared to longer wavelengths. Activated carbon can sustain its photocatalytic activity when mixed with cement, indicating its potential applications in airpurifying building materials.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Yunmei Wei, Shuang Chen, Tingting Ren, Lianying Chen, Yuanyuan Liu, Junmin Gao, Yunyi Li
Summary: The study demonstrates the effectiveness of thermally activated PS oxidation technique for cyanide elimination from polluted soil, with the two-step oxidation process being more effective for the removal of iron-cyanide complexes. The presence of dissolved soil components increases PS consumption, while SO4 center dot- and HO center dot are identified as the principal reactive radicals responsible for Fe-CN degradation.
Article
Environmental Sciences
Lina Ramirez Arenas, Philippe Le Coustumer, Stephan Ramseier Gentile, Stephane Zimmermann, Serge Stoll
Summary: The presence of nanoparticles in drinking water raises concerns about their potential risks to human health and the efficacy of water treatment plants in removing them. This study examines the efficiency of granular activated carbon (GAC) in removing CeO2 nanoparticles. The results show that GAC has a good affinity for nanoparticles, with higher adsorption capacity and removal efficiency in lake water compared to ultrapure water. The adsorption mechanism is mainly controlled by electrostatic attractions, and mass transfer processes play a role in the removal of nanoparticles in lake water.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Jingwen Zhang, Shengjuan Shao, Xin Ding, Zhixing Li, Jiaxin Jing, Weizhou Jiao, Youzhi Liu
Summary: In this study, the high-gravity technique was employed to enhance the heterogeneous catalytic ozonation process using activated carbon as the catalyst for the removal of phenol from wastewater. The results showed that the high-gravity factors, inlet O3 concentration, liquid-gas ratio, and initial pH all had significant effects on the degradation and mineralization of phenol. The RPB/O3/AC system demonstrated higher mineralization rate compared to the bubbling reactor and RPB/O3 systems, indicating the synergistic effect of AC-catalyzed ozonation and high-gravity technique on the degradation of organic pollutants.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Junjie Chen, Jingjing Sun, Mingyu Luo, Yixin Li, Zhaoshou Wang, Yuanpeng Wang
Summary: In this study, a recyclable biofilm material was prepared by loading H. arsenicoxydans onto electrospun biomass-activated carbon nanofibers (H. arsenicoxydans-BACFs films). The biofilms showed a significant increase in As(III) removal rate and demonstrated biocompatibility, ideal catalytic As(III) oxidation, and recyclability. The improved catalytic efficiency is attributed to biomass accumulation and the electron transfer facilitated by the BACF films. The oxidation process of As(III) in the H. arsenicoxydans-BACFs composite biofilm reactor followed a first-order kinetic equation, with the fastest oxidation rate observed for H. arsenicoxydans-BACF0.4. The H. arsenicoxydans-BACF films outperformed traditional catalytic materials and could be used for the remediation of As(III)-contaminated wastewater.
Article
Environmental Sciences
P. Eskandari, M. Farhadian, A. R. Solaimany Nazar, A. Goshadrou
Summary: The study demonstrated that modifying activated carbon with nanocrystalline metal oxides can enhance adsorption capacity and removal efficiency. The Langmuir model was found to be the most suitable isotherm model, while kinetic modeling showed that cyanide adsorption followed a pseudo second-order mechanism.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Physical
Miyeon Jeong, Shufang Zhao, Yujing Ji, Sher Ali Khan, Shahid Saqlain, Young Dok Kim
Summary: The removal efficiencies of benzene and ammonia using commercial activated carbon were studied under different relative humidity conditions and with or without visible light irradiation. The results showed that light could enhance the removal efficiency of benzene even under nitrogen, and the effect was more significant in the presence of water and oxygen. It was also found that visible light irradiation could enhance the ammonia removal efficiency under optimal humidity conditions. The study further suggested that light and water facilitated more efficient migration of NH3 through the nanoporous channels of activated carbon. Fourier-transform infrared (FT-IR) analyses revealed the changes in surface structure of activated carbon caused by oxidizing agents generated with light irradiation and other reagents.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Farid Halet, Ahmed Reda Yeddou, Abdelmalek Chergui, Salima Chergui, Boubekeur Nadjemi, Aissa Ould-Dris
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
(2015)
Article
Environmental Sciences
Salima Chergui, Ahmed Reda Yeddou, Abdelmalek Chergui, Farid Halet, Hamza Amaouche, Boubekeur Nadjemi, Aissa Ould-Dris
TOXICOLOGICAL AND ENVIRONMENTAL CHEMISTRY
(2015)
Article
Engineering, Chemical
Abdelali Gherbia, Abdelmalek Chergui, Ahmed Reda Yeddou, Ammar Selatnia, Charlotte Hurel, Nicolas Marmier, Rabah Kerbachi, Boubekeur Nadjemi
DESALINATION AND WATER TREATMENT
(2016)
Article
Engineering, Chemical
Mohamed Nasser Sahmoune, Ahmed Reda Yeddou
DESALINATION AND WATER TREATMENT
(2016)
Article
Engineering, Chemical
Hadj Daoud Bouras, Ahmed Reda Yeddou, Noureddine Bouras, Djamila Hellel, Michael D. Holtz, Nasserdine Sabaou, Abdelmalek Chergui, Boubekeur Nadjemi
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2017)
Article
Engineering, Chemical
Ahmed Reda Yeddou, Salima Chergui, Abdelmalek Chergui, Farid Halet, Amaouche Hamza, Boubekeur Nadjemi, Aissa Ould-Dris, Jamal Belkouch
MINERALS ENGINEERING
(2011)
Article
Engineering, Environmental
Hamza Amaouche, Salima Chergui, Farid Halet, Ahmed Reda Yeddou, Abdelmalek Chergui, Boubekeur Nadjemi, Aissa Ould-Dris
WATER SCIENCE AND TECHNOLOGY
(2019)
Article
Engineering, Environmental
Ali Alouache, Ammar Selatnia, Abdelouhab Lefkir, Farid Halet, Houssem Eddine Sayah, Boubekeur Nadjemi
WATER SCIENCE AND TECHNOLOGY
(2019)
Article
Engineering, Environmental
Salima Chergui, Ahmed Reda Yeddou, Abdelmalek Chergui, Farid Halet, Boubekeur Nadjemi, Aissa Ould-Dris
Summary: This study investigates the potential of sorghum stems as an alternative and cost-effective adsorbent for cyanide adsorption. The results demonstrate that sorghum stems have high adsorption capacity and easy preparation, making them an interesting candidate for adsorption.
JOURNAL OF HAZARDOUS TOXIC AND RADIOACTIVE WASTE
(2022)
Article
Environmental Sciences
A. Gherbia, A. Chergui, A. R. Yeddou, Selatnia S. Ammar, N. Boubekeur
GLOBAL NEST JOURNAL
(2019)
Proceedings Paper
Engineering, Environmental
A. Alouache, A. Selatnia, F. Halet
FRONTIERS IN WASTEWATER TREATMENT AND MODELLING, FICWTM 2017
(2017)
Article
Biochemistry & Molecular Biology
Mohamed Hachi, Abdelmalek Chergui, Ahmed Reda Yeddou, Ammar Selatnia, Hubert Cabana
BIOCATALYSIS AND BIOTRANSFORMATION
(2017)
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)