MSE 2022
Poster
Bibliometric analysis of the electrochemical recycling of metals for waste treatment
HK

Himanshu Dilip Khadse (M.Eng.)

SRH Berlin University Applied Science

Khadse, H. (Speaker)¹; Beck, G.¹; Pugalendran, M.¹
¹SRH Berlin University of Applied Sciences

Recycling of metals is gaining importance with arrival of the decade. Increasing application and demand of smart tech has driven demand for technology metals in past few years. Drive of self-reliant nation around the world and monopoly of certain countries on metal reserves are some factors for technology metals being critical raw materials (CRM) within EU, USA and many more countries. Due to this it is important to recover these metals from waste (particularly WEEE) within the nation’s borders. The cheap technology metals are seldom recovered in conventional pyrometallurgical recycling processes. Also, recycling of metals has an underlying challenge of obtaining purity of metals while recovery. As potential alternative for obtaining metals in pure form, electrochemical methods have gained more popularity among researchers. To develop understanding over research trends and countries involved in the research of electrochemical recycling process, a bibliometric study was carried out. From the SCOPUS database, research papers, secondary documents and patents were studied using statistical approach to find out emerging trends and collaboration between the countries using VOSviewer. Total of 616 documents including 275 research papers, 45 secondary documents and 296 patents were obtained from a time period of the past 30 years. In keywords (158) analysis it was found that methods like electrodeposition (71), cyclic voltammetry (25) and electrowinning (13) were among the frequently occurring and keywords like electrochemical recovery (1265) and electrodeposition (614) had highest link strength. Occurrence of metals like palladium (11), copper (30) nickel (15), and silver (24) were also recorded. Among 275 research papers most papers were published by researchers in USA (45) and China (39) followed by UK (20), South Korea (19) and Japan (16). In terms of citations of documents, it was recorded that US (1077) has more citations followed by China (627) and Brazil (533). Among the registered patents US (61%) was leading and Europe (10%) is trailing with least number of patents. The data was also analyzed to categorize documents on basis of recycling of base metals and technology metals. Within the technology metals it was differentiated between precious metals and other technology metals. This analysis reveals the potential of electrochemistry even in the field of recycling of cheap technology metals. Furthermore, electrochemical recovery of metals is gaining importance in every part of world with developing countries like Brazil, India and Mexico actively taking part in recycling research due to demand driven by technology. Methods like cyclic voltammetry, electrodeposition and electrowinning are prominent and widely practiced. Also, EU needs to strengthen the research as research links within EU nations are scarce.


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