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Recovery of platinum from spent automotive catalyst based on Hydrometallurgy

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Rare Metals 2023年第4期42卷 1118-1137页

作者： Tao Ge Jin-Dong He Liang Xu Yan-Hang Xiong Ling Wang Xiao-Wei Zhou Yong-Pan Tian Zhuo Zhao School of Metallurgical Engineering Anhui University of TechnologyMa’anshan243032China State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming650093China Low-Carbon Research Institute Anhui University of TechnologyMa’anshan243032China

Platinum(Pt)is a critical raw material for automotive catalytic converters due to its high-temperature stability,corrosion resistance and catalytic activity,whereas its limited primary resources and uneven distribution make it hard to meet the growing demand of platinum.Spent automotive catalyst(SAC)is currently the most important secondary resource of platinum,of which the platinum content is much higher than that of the primary platinum resources.The recovery process of platinum from spent automobile catalyst mainly consists of pretreatment followed by enrichment and refining,involving pyro-and hydrometallurgical techniques,among which enrichment and refining processes are extremely important for platinum recovery from spent automobile catalyst.This paper provides an overview of the technologies for platinum recovery from spent automotive catalyst.The emphasis is placed on the processes of enrichment and refining based on hydrometallurgical techniques.Future directions of research and development of platinum recovery from spent automobile catalyst are also proposed.

关键词： Platinum(Pt) Platinum group metals Spent automotive catalyst(SAC) Hydrometallurgy Solvent extraction Separation and purification

Technology development for rare earth cleaner Hydrometallurgy in China

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Rare Metals 2015年第4期34卷 215-222页

作者： Xiao-Wei Huang Zhi-Qi Long Liang-Shi Wang Zong-Yu Feng National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals Grirem Advanced Materials Co. Ltd.

China is the global leader in rare earth （RE） production using hydrometallurgical processes. Advantageous extraction techniques of rare earths from Baotou mixed rare earth minerals, bastnaesite, and ion-adsorption clays of rare earth deposits have been developed in China. The separation and purification technologies have also achieved rapid development. The industrial application processes for rare earth Hydrometallurgy were summarized in the present paper. With the large demands and rapid development of rare earths, the issues of resources and environment are more prominent. This review gives an overview of the main processes that were developed in the past toward greener Hydrometallurgy of rare earths in China. Based on the development of the rare earth industry, comprehensive utilization and cleaner production should still be focused on in the future, to support the sustainable development.

关键词： Rare earths Cleaner production Separation and purification Hydrometallurgy

Process modeling issues arising in zinc Hydrometallurgy

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Science Foundation in China 2015年第2期23卷 66-80页

作者： YANG ChunHua ZHOU XiaoJun ZHU HongQiu LI YongGang GUI WeiHua School of Information Science and Engineering Central South University

As typical nonferrous metallurgical processes,hydrometallurgical processes are used extensively to recover elemental zinc from raw ores.Accurate system models must be established to increase automation of hydrometallurgical zinc processes with strict energy and environmental requirements.However,the modeling of such processes is hindered by their complex production characteristics and process mechanisms.In this review,we summarize some process modeling issues arising in zinc Hydrometallurgy and provide several possible solutions from the perspective of our research work.

关键词： Zinc Hydrometallurgy Process modeling Integrated modeling Nonferrous metallurgy

Expert fault diagnosis system for leaching process in zinc Hydrometallurgy

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中国有色金属学会会刊：英文版 2000年第5期10卷 699-703页

作者：吴敏唐朝晖桂卫华中南工业大学湖南长沙

Leaching process is the first step in zinc Hydrometallurgy, which involves the complex chemical reactions for dissolving zinc bearing material in dilute sulfuric acid. Ensuring the safe running of the process is a key point in the operation. An expert fault diagnosis system for the leaching process was proposed, which has been implemented in a nonferrous metals smeltery. The system architecture and the diagnosis procedure were presented, and the rule models with the certainty factor were constructed based on the empirical knowledge, empirical data and statistical results on past fault countermeasures, and an expert reasoning strategy was proposed which employs the rule models and Beyes presentation and combines forward chaining and backward chaining. [

关键词： zinc Hydrometallurgy leaching process fault diagnosis expert systems rule models Beyes presentation

Non-toxic, high selectivity process for the extraction of precious metals from waste printed circuit boards

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Frontiers of Environmental Science & Engineering 2023年第10期17卷 65-74页

作者： Giulia Merli Alessandro Becci Alessia Amato Francesca Beolchini Department of Life and Environmental Sciences Polytechnic University of MarcheAncona 60131Italy

The work presented here focused on the extraction of gold (Au), silver (Ag) and palladium (Pd) from electronic waste using a solution of ammonium thiosulfate. Thiosulfate was used as a valid alternative to cyanide for precious metal extractions, due to its non-toxicity and high selectivity. The interactions between sodium thiosulfate, total ammonia/ammonium, precious metal concentrations and the particle size of the waste printed circuit boards (WPCBs) were studied by the response surface methodology (RSM) and the principal component analysis (PCA) to maximize precious metal mobilization. Au extraction reached a high efficiency with a granulometry of less than 0.25 mm, but the consumption of reagents was high. On the other hand, Ag extraction depended neither on thiosulfate/ammonia concentration nor granulometry of WPCBs and it showed efficiency of 90% also with the biggest particle size (0.50 < Ø < 1.00 mm). Pd extraction, similarly to Au, showed the best efficiency with the smallest and the medium WPCB sizes, but required less reagents compared to Au. The results showed that precious metal leaching is a complex process (mainly for Au, which requires more severe conditions in order to achieve high extraction efficiencies) correlated with reagent concentrations, precious metal concentrations and WPCB particle sizes. These results have great potentiality, suggesting the possibility of a more selective recovery of precious metals based on the different granulometry of the WPCBs. Furthermore, the high extraction efficiencies obtained for all the metals bode well in the perspective of large-scale applications.

关键词： Thiosulfate Printed circuit boards Precious metals Leaching Hydrometallurgy

EXPERT OPTIMIZED CONTROL TECHNIQUE FOR ELECTROLYTIC DEPOSITION PROCESS OF Hydrometallurgy OF ZINC

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中国有色金属学会会刊：英文版 1997年第4期7卷 134-138页

作者： Yang Chunhua, Gui Weihua, Ye Wenwu Information Engineering Institute, Central South University of Technology, Changsha 410083

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关键词： Hydrometallurgy of zinc electrolytic deposit process expert optimization self learning real time control

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离子交换树脂在湿法冶金中的应用

离子交换与吸附 1993年第3期 250-260页

作者：马建标何炳林南开大学高分子化学研究所南开大学高分子化学研究所天津 300071

本文简要综述了离子交换树脂在贵金属、稀有金属、稀土金属、铀及其它放射性核素等金属的湿法提取分离与纯化中的应用。

关键词： ion exchange resins Hydrometallurgy noble metal rare-earth metal uranium.

Development Status and Research Progress in Rare Earth Hydrometallurgy in China

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Journal of Rare Earths 2006年第2期24卷 154-154页

作者： Huang Xiaowei Li Hongwei Xue Xiangxin Zhang Guocheng National Engineering Center for Rare Earth Materials General Research Institute for Non-Ferrous Metals Beijing 100088 China Grirem Advanced Materials Co. Ltd. Beijing China Institute of Metallurgical Resources ＆ Environmental Engineering Northeastern University Shenyang 110004 China

Characteristic and Hydrometallurgy processes for Baotou mixed-type rare earth concentrate, bastnasite, and ionic adsorption deposit in China were reviewed. The R ＆ D circumstance and new progresses in extraction and separation of RE element in China were introduced. Moreover, the development trend of RE Hydrometallurgy was predicted. The direction and emphasised fields of research and development are also brought forward as： to R ＆ D high efficient green progresses in Hydrometallurgy and separation of RE ore, resolve the waste pollution problem of water, slagand gas, reduce the chemical material consumption and improve comprehensive efficiency of resources; to R ＆ D preparation technology for RE compounds with ultra high-purity and special physical property for extending application fields of RE.

关键词： Hydrometallurgy review rare earths

Sustainable recycling of titanium from TiO_(2) in spent SCR denitration catalyst via molten salt electrolysis

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Journal of Energy Chemistry 2021年第7期30卷 557-563页

作者： Xuyang Bai Xiaojia Shang Heli Wan Yusi Che Bin Yang Jilin He Jianxun Song Henan Province Industrial Technology Research Institute of Resources and Materials Zhengzhou University450001 ZhengzhouHenanChina National Engineering Laboratory of Vacuum Metallurgy Kunming University of Science and Technology650093 KunmingYunnanChina State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization 650093 KunmingYunnanChina

Spent catalyst used for denitration by selective catalytic reduction(spent SCR denitration catalysts) is one of the important urban mines due to the high content of TiO_(2)(~85 wt%) and the massive accumulation amount(over 100,000 tons),therefore,value-added reutilization of titanium in spent SCR catalysts is considerably meaningful.In this paper,a novel method is proposed for converting the titanium oxide in spent SCR denitration catalysts to metallic titanium.Specifically,titanium dioxide(TiO_(2)) was firstly obtained from spent SCR denitration catalysts after removing the impurities by Hydrometallurgy process.Then,TiO_(2) is converted to Ti_(2)CO by carbothermic reduction method,and Ti_(2)CO was further purified by oleic acid capture.Finally,by utilizing the as-prepared Ti_(2)CO as the consumable anode in the NaCl-KCl molten salt,high-purity metallic titanium was deposited at cathode,all confirming the feasibility for the conversion of low-grade TiO_(2) in the spent catalysts,from 60 wt% to high-purity metallic Ti(99.5 wt%), furthermore,the energy consumption of this process is 3950 kWh tonne-1 Ti,which is lower than that of most traditional titanium metallurgy methods.The method herein can provide new insights for the value-added recycling of titanium resources in urban mines.

关键词： Spent SCR denitration catalyst Hydrometallurgy Impurity Ti_(2)CO Molten salt