Article
Engineering, Chemical
Zidong Tan, Yong Zhen, Chang Wei, Xin Jin, Xingbin Li, Gang Fan, Xingguo Luo
Summary: In this study, germanium was selectively extracted using an organic phase containing YW100, D2EHPA, N235, and kerosene. The extraction process achieved a high extraction ratio and the addition of N235 improved the phase separation performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zidong Tan, Xin Jin, Yong Zhen, Chang Wei, Xingbin Li, Zhigan Deng, Minting Li
Summary: Selective extraction of indium and selective precipitation of germanium using D2EHPA and tannin were studied in this paper. The extraction of indium was achieved using 15% D2EHPA in kerosene, followed by washing with 0.5 M H2SO4 and stripping with 4 M HCl. The precipitation of germanium was achieved by adjusting the pH of the raffinate, mixing it with tannin, and then baking the tannin-germanium complex at 500 degrees C. This proposed process flow provides a selective recovery method for germanium and indium from In-Ge residue leaching solutions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Review
Environmental Sciences
Erkang Feng, Dongjing Gao, Yutong Wang, Fengshan Yu, Chunxia Wang, Jiawei Wen, Yangqin Gao, Guoyong Huang, Shengming Xu
Summary: The exploitation and utilization of secondary resources have social benefits such as resource conservation, pollution reduction, and cost reduction in production. However, less than 20% of titanium secondary resources are currently recyclable, and there is limited research on titanium secondary resource recovery. This article provides an overview of the global distribution of titanium resources, market supply and demand, and technical studies on titanium extraction from different titanium-bearing secondary slags. It compares various methods of secondary resource recovery, points out the future development direction of titanium recycling, and emphasizes the need for attention to lithium titanate waste recycling.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Review
Environmental Sciences
Hossein Kamran Haghighi, Mehdi Irannajad
Summary: Germanium, a strategic metalloid, is mainly sourced from rare zinc minerals and coal-related products, with recycling materials also playing an increasing role. 70% of global germanium production comes from primary resources, while the rest is from recycled materials, driving the industry to explore alternative resources and extraction technologies.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Yifan Wang, Yonghui Song, Yifan Li, Jin Li, Jin Bao, Xinwei Zhang, Bo Li
Summary: Efficient and sustainable recovery of precious metals from acidic leaching solution can be achieved using a hydrophobic deep eutectic solvent (HDES) synthesized from trioctylmethylammonium chloride (N263) and oleic acid (OA). The study investigated the effects of different experimental conditions on the extraction process and analyzed the reaction mechanisms using various characterization techniques. The results demonstrated that HDES has a high saturation extraction capacity and can effectively recover precious metals.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Review
Metallurgy & Metallurgical Engineering
Pratima Meshram, Abhilash
Summary: This review discusses the availability and recovery methods of germanium in primary and secondary resources. It highlights the high demand for germanium in fiber optics and the scarcity of resources, resulting in the global consumption exceeding primary production. Various resources such as zinc plant residues, coal and coal plant waste, spent optical fibers, and copper flue dust have been examined for germanium recovery. Chemical precipitation, solvent extraction, ion exchange, membrane processes, and biological approaches have been explored for the separation of germanium.
MINING METALLURGY & EXPLORATION
(2022)
Article
Engineering, Chemical
Mudila Dhanunjaya Rao, Kamalesh K. Singh, Carole A. Morrison, Jason B. Love
Summary: The new hydrometallurgical route allows for the complete recycling of copper and gold from WPCBs under relatively benign laboratory conditions, serving as a proof of concept for liberating valuable and critical metals back into active service from end-of-life electronic devices.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Arina V. V. Kozhevnikova, Inna V. V. Zinov'eva, Yulia A. A. Zakhodyaeva, Vasilisa B. B. Baranovskaya, Andrey A. A. Voshkin
Summary: This paper presents the results of using hydrophobic deep eutectic solvents (HDESs) to extract metal ions from different types of Li-ion battery cathode solutions. The results show that all elements can be efficiently extracted through cross-current extraction and stepwise separation using HDESs. This method has the potential to be used in recycling end-of-life Li-ion batteries.
Article
Green & Sustainable Science & Technology
Yuanlin Chen, Guangsheng Huo, Xueyi Guo, Qinmeng Wang
Summary: This study introduces a process of extracting tungsten from acid digestion product, achieving the preparation of pure (NH4)(2)WO4 solution through leaching-solvent extraction and raffinate circulation. By optimizing the selection of solvents and stripping agents, as well as the recycling of raffinate, the discharge of wastewater is reduced.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Chemical
Pengcheng Wang, Zhihong Liu, Tao Zhang, Zhiyong Liu, Deqing Zhu, Tao Jiang
Summary: With the increasing demand for germanium in high-technology fields, the study investigated the mechanism of Ge(IV) extraction from a sulfuric acid solution using the tertiary amines (N235) and trioctyl phosphate (TOP) system. The extraction process followed an anion exchange mechanism and Ge(IV) was extracted as a Ge(OH)(HL)3 anion complex. Tartaric acid coordinated to Ge(IV) via a C-O bond from the carboxylate group. The extracted complex species were identified as Ge(OH)(HL)(2)L center dot HN(R-1)(3) and Ge(OH)(HL)L-2 center dot[HN(R-1)(3)](2) (R=C8H17).
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Review
Green & Sustainable Science & Technology
Guillermo Alvial-Hein, Harshit Mahandra, Ahmad Ghahreman
Summary: The increasing demand for cobalt and nickel due to advanced technologies has highlighted the need for efficient recycling from secondary resources through solvent extraction processes. This review discusses the applicability of different extractants for better separation and recovery of these metals, aiming to maintain the stability of the supply chain.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Hyeonseok Lee, Caleb Stetson, Christopher J. Orme, Miranda W. Kuns, Jeffrey A. Lacey, Lorenzo Vega-Montoto, Seth W. Snyder, Joseph R. Wilbanks, Julie L. Bowen, Aaron D. Wilson
Summary: As primary feedstocks deplete, it is crucial to develop energy- and reagent-efficient methods for material reuse. This study addresses the challenge of recycling soiled pizza boxes and other complex materials by using an environmentally friendly organic solvent. The results indicate the potential for efficient separation of components, paving the way for clean production in a circular economy.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Chemical
Yingjie Xu, Daokai Qu, Hongying Xia, Qi Zhang, Libo Zhang
Summary: This study analyzed the occurrence and migration of germanium in the process of zinc hydrometallurgy in lead-zinc sulfide ore. It was found that roasting in the process led to the transformation of soluble GeO2 to insoluble GeO2, and certain substances carried germanium into lead slag. Solutions were proposed to introduce green additives and oxidants or reducing agents in the germanium recovery process.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zhongqi Ren, Xiaoyu Wei, Rujie Li, Wanhang Wang, Yangyang Wang, Zhiyong Zhou
Summary: This study developed a new method for selectively extracting lithium ions from high Mg/Li salt lake brine, achieving efficient extraction and separation under optimized conditions with new co-extractant and diluent. The extraction system demonstrated excellent stability and reusability, showing potential for further research and industrial applications.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Haibing Xiao, Liang Chen, Zhifeng Qin, Rentao Yin, Dingsong Weng, Zhenghao Wang, Dongmei Luo
Summary: An efficient method is proposed to separate vanadium, molybdenum, and tungsten from the leachate of hydrometallurgical treated spent SCR catalysts. This method involves acidified primary amine N1923 extraction and selective stripping using sulfuric acid and ammonia solution.
Article
Green & Sustainable Science & Technology
Lars odegaard Bentsen, Narada Dilp Warakagoda, Roy Stenbro, Paal Engelstad
Summary: This study investigates uncertainty modeling in wind power forecasting using different parametric and non-parametric methods. Johnson's SU distribution is found to outperform Gaussian distributions in predicting wind power. This research contributes to the literature by introducing Johnson's SU distribution as a candidate for probabilistic wind forecasting.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Xing Liu, Qiuchen Wang, Yunhao Wen, Long Li, Xinfang Zhang, Yi Wang
Summary: This study analyzes the characteristics of process parameters in three lean gas ethane recovery processes and establishes a prediction and multiobjective optimization model for ethane recovery and system energy consumption. A new method for comparing ethane recovery processes for lean gas is proposed, and the addition of extra coolers improves the ethane recovery. The support vector regression model based on grey wolf optimization demonstrates the highest prediction accuracy, and the multiobjective multiverse optimization algorithm shows the best optimization performance and diversity in the solutions.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Cairong Song, Haidong Yang, Xian-Bing Meng, Pan Yang, Jianyang Cai, Hao Bao, Kangkang Xu
Summary: The paper proposes a novel deep learning-based prediction framework, aTCN-LSTM, for accurate cooling load predictions. The framework utilizes a gate-controlled multi-head temporal convolutional network and a sparse probabilistic self-attention mechanism with a bidirectional long short-term memory network to capture both temporal and long-term dependencies in the cooling load sequences. Experimental results demonstrate the effectiveness and superiority of the proposed method, which can serve as an effective guide for HVAC chiller scheduling and demand management initiatives.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Zhe Chen, Xiaojing Li, Xianli Xia, Jizhou Zhang
Summary: This study uses survey data from the Loess Plateau in China to evaluate the impact of social interaction on the adoption of soil and water conservation (SWC) technology by farmers. The study finds that social interaction increases the likelihood of farmers adopting SWC, and internet use moderates this effect. The positive impact of social interaction on SWC adoption is more pronounced for farmers in larger villages and those who join cooperative societies.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Chenghua Zhang, Yunfei Yan, Kaiming Shen, Zongguo Xue, Jingxiang You, Yonghong Wu, Ziqiang He
Summary: This paper reports a novel method that significantly improves combustion performance, including heat transfer enhancement under steady-state conditions and adaptive stable flame regulation under velocity sudden increase.
JOURNAL OF CLEANER PRODUCTION
(2024)