Article
Engineering, Chemical
Nor Kamariah, Demian Kalebic, Panagiotis Xanthopoulos, Rosie Blannin, Fernando P. Araujo, Steven-Friso Koelewijn, Wim Dehaen, Koen Binnemans, Jeroen Spooren
Summary: This study compared the effects of conventional roasting (CR) and microwave-assisted roasting (MR) on the transformation of sulfidic tailings. It was found that MR accelerated the oxidation rate of pyrite and resulted in a different reaction pathway compared to CR. The leaching experiments showed that CR extracted more targeted metals from the tailings compared to MR.
MINERALS ENGINEERING
(2022)
Article
Environmental Sciences
Haoyu Li, Jun Wang, Xuejun Zhu, Tao Yang, Jun Deng, Beilei Yan, Xuehua Mao, Yi Zhang, Shiwei Li
Summary: A novel microwave-assisted chlorination thermal treatment recovery technology was proposed in this paper for the clean treatment of refractory cyanide tailings containing sulfur. The study compared the treatment capacity of common chlorinated agents and found CaCl2 to be the best chlorination agent. The specific action mechanism of CaCl2 in the microwave roasting process was studied, and a method and mechanism for removing residual harmful substances in roasting slag were proposed based on environmental assessment.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Multidisciplinary Sciences
Long Hai, Xianglong Fang, Xin Zhao, Bo Xu, Tongjun Cheng
Summary: The cyanide content in gold tailings is seriously exceeding the standard due to the cyanide extraction process. To improve the resource utilization efficiency of gold tailings, a medium-temperature roasting experiment was conducted on the stock tailings of Paishanlou gold mine after washing and pressing filtration treatment. The research results provide a low-cost and efficient way for cyanide treatment, which is of great significance for promoting the resource utilization of gold tailings and other cyanide-containing wastes.
SCIENTIFIC REPORTS
(2023)
Article
Energy & Fuels
Haoyu Li, Jun Wang, Xuejun Zhu, Tao Yang, Jun Deng, Beilei Yan, Xuehua Mao, Yi Zhang, Shiwei Li
Summary: This paper explores the synergistic effect of chlorinating agent, atmosphere, and microwave fields for the green and efficient utilization of refractory cyanide tailings. By adding CaCl2 as the chlorinating agent and using O2 as the atmosphere, the dielectric properties of the material were significantly improved. The application of CaCl2 and air accelerated the industrialization process of cyanide tailings recovery and treatment, with high gold recovery rates and chlorine removal rates achieved.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Metallurgy & Metallurgical Engineering
Lei Zhang, Tao Jiang, Xue-yi Guo, Qing-hua Tian, Shui-ping Zhong, Li Dong, Hong Qin, Zuo-wei Liu, Brian Makuza
Summary: This study proposes an eco-friendly and efficient method to recover gold, iron, and silicon from cyanide tailings (CTs). By controlling the reduction atmosphere and temperature, >99% of cyanide can be selectively removed, along with 65.3% of encapsulated gold in iron oxide and sulfide. Mechanical activation reduces particle size and liberates 92.3% of gold encapsulated in silicate and iron oxide minerals, increasing the extraction efficiency of gold to 94.5% in a non-cyanide leaching process. Magnetic separation results in 60.9% grade and 74.6% recovery of iron concentrate, while the tailings with 28.4% Si grade can be used in building materials. This technology enables the harmless utilization of hazardous CTs and shows potential for industrial applications.
Article
Engineering, Chemical
Haoyu Li, Jun Wang, Xuejun Zhu, Tao Yang, Jun Deng, Beilei Yan, Xuehua Mao, Shiwei Li
Summary: This study explores the mechanism of microwave enhancement in the treatment of cyanide tailings using the microwave chlorination heat treatment process. The research finds that cyanide tailings have favorable microwave-absorbing performance and the heating efficiency and activation energy of gold chlorination reaction are significantly improved under the influence of iron oxide. The findings provide valuable references for the industrial application of microwave chlorination roasting on cyanide tailings.
Article
Engineering, Chemical
Lei Ye, Zhiwei Peng, Ran Tian, Huimin Tang, Jian Zhang, Mingjun Rao, Guanghui Li
Summary: A facile route for simultaneous activation and separation of boron and iron from ludwigite ore at low temperature was developed using the synergistic effect of microwave heating and sodium carbonate. The composite system absorbed microwave energy well and promoted the reduction of iron oxides, resulting in the formation of water-soluble metaborate and the restrain of lizardite decomposition. The separated boron-rich leachate and direct reduced iron powders had superior performance compared to conventional methods.
Article
Engineering, Environmental
Jie Cheng, Hong-Yi Li, Xin-Mian Chen, Dong Hai, Jiang Diao, Bing Xie
Summary: This study proposes an eco-friendly method of Cr recovery based on low-dosage soda roasting, which reduces waste discharge from Cr-containing tailings. By controlling targeted phase conversion, efficient extraction and recovery of Cr are achieved.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Geochemistry & Geophysics
Liugen Sun, Kaixi Jiang, Feng Xie, Zhengyang Zhang, Jigang Tang, Jianguo Mi, Yunlong Bai, Luyang Han
Summary: The utilization of cyanide tailings as a resource has significant environmental and economic benefits. Through a chlorination roasting-flotation process, efficient recovery of gold from low-grade cyanide tailings was achieved. The optimized process parameters included specific levels of calcium chloride, internal and external coke, copper sulfide concentrate, kaolin, and roasting temperature, resulting in high recovery rates and low gold grade in the tailings. The study provides potential guiding significance for the efficient recovery of gold from cyanide tailings.
Review
Metallurgy & Metallurgical Engineering
Mohammad Mansouri, Gholam Reza Khayati, Esmaeel Darezereshki
Summary: The tailings of some mines contain a significant amount of aluminosilicate, which presents challenges in storage and disposal. Therefore, there is a motivation to process and produce alumina from these tailings. Various methods have been proposed, and one effective method is to use a combination of roasting and leaching processes. Roasting with the help of salts or in the air changes the structure of aluminosilicate, enabling its dissolution in acids or water and facilitating the production of alumina. This article categorizes the advantages, disadvantages, type of leaching solution, and operating temperature of the roasting and leaching processes for producing alumina from aluminosilicate-containing tailings.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2023)
Article
Green & Sustainable Science & Technology
Haoyu Li, Jinhui Peng, Hailin Long, Shiwei Li, Libo Zhang
Summary: This study investigated the use of CaCl2 as a chlorine source for the sustainable recovery of gold from gold-bearing tailings via chlorination heat treatment, demonstrating its superior chlorine supply capacity. Understanding the mechanism of gold recovery and chlorine removal at different temperatures, the research indicated that roasting tailings with 5 wt% CaCl2 at 1273 K yielded the best results, with an 85.99 wt% gold recovery and 82.84 wt% chlorine removal. Overall, this research contributes to the industrialization of secondary resources through clean treatment processes.
JOURNAL OF CLEANER PRODUCTION
(2021)
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
Construction & Building Technology
Bingjiang Chen, Lufeng Pang, Zaibo Zhou, Qingshan Chang, Peng Fu
Summary: This paper mainly studies the hydration properties of a mechanical-chemical-thermal coupling activated gold tailings-cement-granulated blast furnace slag ternary cementitious material system. The effect of the CGT-cement-GBFS cementitious material system on the mechanical properties and porosity of the mortar is studied. The research results show that the CGT-cement-GBFS cementitious material system improves the overall degree of hydration and compressive strength of the mortar.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Environmental
Alexandra Vasile, Adina Roxana Milasan, Adina Elena Andrei, Ramona Nicoleta Turcu, Marius Florin Dragoescu, Sorin Axinte, Maria Mihaly
Summary: Through a combined process of magnetic separation, microwave digestion, and microemulsion extraction, efficient recovery of iron, lead, zinc, and reduction of mine waste deposits and environmental pollution with heavy metals were achieved.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Environmental Sciences
V. Radomskaya, L. M. Pavlova, L. P. Shumilova, E. N. Voropaeva, N. A. Osipova
Summary: This article presents the results of predicting the behavior of toxicants in gold mining technogenic waste during drainage, using the tailings management facility of Tokur Mill in the Amur Region, Russia, as a case study. The predictive assessment was based on the geochemical composition, migration ability of elements, and acid-producing and acid-neutralizing potentials of the material. It was found that the tailings have a high acid-neutralizing potential and contribute to the formation of neutral and slightly alkaline drainage flows.
ENVIRONMENTAL EARTH SCIENCES
(2021)
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)