{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,7]],"date-time":"2026-05-07T13:15:34Z","timestamp":1778159734140,"version":"3.51.4"},"reference-count":19,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2023,9,1]],"date-time":"2023-09-01T00:00:00Z","timestamp":1693526400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Coordena\u00e7\u00e3o de Aperfei\u00e7oamento de Pessoal de N\u00edvel Superior\u2014Brasil (CAPES)","award":["capes\/pdse\/88881.190561\/2018-01"],"award-info":[{"award-number":["capes\/pdse\/88881.190561\/2018-01"]}]},{"name":"international cooperation program","award":["capes\/pdse\/88881.190561\/2018-01"],"award-info":[{"award-number":["capes\/pdse\/88881.190561\/2018-01"]}]},{"name":"Esp\u00edrito Santo Research and Innovation Support Foundation\u2014FAPES","award":["capes\/pdse\/88881.190561\/2018-01"],"award-info":[{"award-number":["capes\/pdse\/88881.190561\/2018-01"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sustainability"],"abstract":"<jats:p>The exponential growth in the consumption of electronics, in combination with the reduction in their useful life, has led to a significant increase in the volume of electronic materials which are discarded. Printed Circuit Boards (PCBs) are modules composed of ceramic, polymer, and metallic materials of high economic value and with a great potential for damage to biotic and anthropic environments when inadequately discarded. The aims of this work were to study the main environmental impacts and the efficiency of mechanical operations in the electronic waste recycling process in optimizing the concentration of metallic copper. For this, the samples obtained were characterized according to their morphology and chemical composition, and subjected to physical and mechanical treatments: dismantling, grinding, separation by granulometry, density, and magnetic property. The environment impacts were estimated by the Life Cycle Assessment of the pre-treatment processes, associated with copper extraction operations in Waste Printed Circuit Boards (WPCBs). According to the results obtained, it is possible to infer that the NM + 1 mm Concentrated product presents in its metallic composition around 78% copper, which contributes to the efficiency of the hydrometallurgical extraction processes. It is noteworthy that the Concentrated class represents about 14% of copper (wt) taking into account the amount of 3.789 kg of PCB waste input material. The potential for reinsertion of the dust in the material recovery process is highlighted, given that the chemical composition of this particulate has a significant presence of metals. In general, it was found that due to the higher concentration (wt%) of the sample being allocated in the range of \u22120.15 mm + 0.05 mm, the elements Fe (18.30%), Si (10.73%), Ca (9.21%), and Cu (8.89%) stand out regarding the participation of the elemental composition of this fraction and also regarding the general composition of the sample. Furthermore, the generation of dust during the fragmentation process can be associated with occupational respiratory diseases when not managed. About the Life Cycle Assessment, in seven of the nine categories evaluated, crushing and screening activities accounted for more than 90% of the recorded impact values. In general, it is estimated that in the pre-treatment phase it generated 15.4 kg CO2 eq.<\/jats:p>","DOI":"10.3390\/su151713175","type":"journal-article","created":{"date-parts":[[2023,9,1]],"date-time":"2023-09-01T08:19:39Z","timestamp":1693556379000},"page":"13175","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Environmental and Technological Assessment of Operations for Extraction and Concentration of Metals in Electronic Waste"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6865-851X","authenticated-orcid":false,"given":"Josinaldo","family":"Dias","sequence":"first","affiliation":[{"name":"Agricultural Sciences and Engineering Center, Federal University of Esp\u00edrito Santo, Alegre 29500-000, Brazil"}]},{"given":"Angelus Giuseppe Pereira","family":"Silva","sequence":"additional","affiliation":[{"name":"Laboratory of Advanced Materials, State University of the Northern Rio de Janeiro, Campos dos Goytacazes 28013-602, Brazil"}]},{"given":"Jos\u00e9 Nilson Fran\u00e7a","family":"de Holanda","sequence":"additional","affiliation":[{"name":"Laboratory of Advanced Materials, State University of the Northern Rio de Janeiro, Campos dos Goytacazes 28013-602, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1573-8353","authenticated-orcid":false,"given":"Fab\u00edola Martins","family":"Delatorre","sequence":"additional","affiliation":[{"name":"Agricultural Sciences and Engineering Center, Federal University of Esp\u00edrito Santo, Alegre 29500-000, Brazil"}]},{"given":"Amanda Oliveira","family":"da Concei\u00e7\u00e3o","sequence":"additional","affiliation":[{"name":"Agricultural Sciences and Engineering Center, Federal University of Esp\u00edrito Santo, Alegre 29500-000, Brazil"}]},{"given":"Gilson Mendon\u00e7a","family":"de Miranda J\u00fanior","sequence":"additional","affiliation":[{"name":"Agricultural Sciences and Engineering Center, Federal University of Esp\u00edrito Santo, Alegre 29500-000, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2484-4788","authenticated-orcid":false,"given":"Aurora","family":"Futuro","sequence":"additional","affiliation":[{"name":"LEPABE, Department of Metallurgical and Materials Engineering, Faculty of Engineering, University of Porto, 4169-007 Porto, Portugal"}]},{"given":"S\u00edlvia Cardinal","family":"Pinho","sequence":"additional","affiliation":[{"name":"LEPABE, Department of Metallurgical and Materials Engineering, Faculty of Engineering, University of Porto, 4169-007 Porto, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2023,9,1]]},"reference":[{"key":"ref_1","first-page":"22","article-title":"Minera\u00e7\u00e3o Urbana de res\u00edduos eletroeletr\u00f4nicos: Uma nova fronteira a explorar no Brasil","volume":"379","author":"Xavier","year":"2018","journal-title":"Bras. Miner."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"513","DOI":"10.1016\/j.jmrt.2018.05.003","article-title":"Copper and metals concentration from printed circuit boards using a zig-zag classifier","volume":"8","author":"Ribeiro","year":"2019","journal-title":"J. Mater. Res. Technol."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"823","DOI":"10.1016\/j.jhazmat.2009.10.083","article-title":"A new technology for recycling materials from waste printed circuit boards","volume":"175","author":"Zhou","year":"2010","journal-title":"J. Hazard. Mater."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"931","DOI":"10.1590\/0104-6632.20180353s20170291","article-title":"Gold recovery from printed circuit boards of mobile phones scraps using a leaching solution alternative to cyanide","volume":"35","author":"Kasper","year":"2018","journal-title":"Braz. J. Chem. Eng."},{"key":"ref_5","first-page":"657","article-title":"Recovering materials from waste mobile phones: Recent technological developments","volume":"136","author":"Gu","year":"2019","journal-title":"J. Clean. Prod."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"5","DOI":"10.1016\/j.jclepro.2015.02.024","article-title":"Waste Printed Circuit Boards Recycling: An Extensive Assessment of Current Status","volume":"94","author":"Ghosh","year":"2015","journal-title":"J. Clean. Prod."},{"key":"ref_7","unstructured":"Kaya, M. (2018). Reference Module in Materials Science and Materials Engineering\/Encyclopedia of Renewable and Sustainable Materials Volume, Elsevier."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"805","DOI":"10.1016\/j.jiec.2014.04.016","article-title":"Recycling of printed circuit boards (PCBs) to generate enriched rare metal concentrate","volume":"21","author":"Kumar","year":"2015","journal-title":"J. Ind. Eng. Chem."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1113","DOI":"10.1016\/j.jclepro.2018.02.250","article-title":"Two-step pre-processing enrichment of waste printed circuit boards: Mechanical milling and physical separation","volume":"184","author":"Nekouei","year":"2018","journal-title":"J. Clean. Prod."},{"key":"ref_10","unstructured":"Silvas, F.P.C. (2014). Utiliza\u00e7\u00e3o de Hidrometalurgia e Biohidrometalurgia para Reciclagem de Placas de Circuito Impresso\/F.P.C. Silvas.\u2014Tese (Doutorado)\u2014Escola Polit\u00e9cnica da Universidade de S\u00e3o Paulo, Departamento de Engenharia Qu\u00edmica."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"296","DOI":"10.1016\/j.resconrec.2017.07.031","article-title":"Electronic waste as a secondary source of critical metals: Management and recovery technologies","volume":"135","author":"Rene","year":"2018","journal-title":"Resour. Conserv. Recycl."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"477","DOI":"10.1016\/j.psep.2018.03.003","article-title":"A review on computer waste with its special insight to toxic elements, segregation and recycling techniques","volume":"116","author":"Suresh","year":"2018","journal-title":"Process Saf. Environ. Prot."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"2842","DOI":"10.1016\/j.wasman.2009.07.007","article-title":"The general utilization of scrapped PC board","volume":"29","author":"Liu","year":"2009","journal-title":"Waste Manag."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"76202","DOI":"10.1007\/s11356-022-21292-w","article-title":"Eco-friendly ceramic bricks: A comparative study of life cycle impact methods","volume":"29","author":"Dias","year":"2022","journal-title":"Environ. Sci. Pollut. Res."},{"key":"ref_15","unstructured":"(1995). Soil Quality\u2014Extraction of Trace Metals Soluble in Aqua Regia (Standard No. ISO 11466:1995)."},{"key":"ref_16","unstructured":"(2001). Characterization of Waste-Determination of Total Organic Carbon (TOC) in Waste, Sludges and Sediments (Standard No. EN 13137: 2001)."},{"key":"ref_17","unstructured":"(2006). Environmental Management Life Cycle Assessment\u2014Principles and Framework (Standard No. ISO 14040: 2006\/Amd 1:2020)."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"503","DOI":"10.1016\/j.wasman.2015.08.030","article-title":"Printed circuit board recycling: Physical processing and copper extraction by selective leaching","volume":"46","author":"Silvas","year":"2015","journal-title":"Waste Manag."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2134","DOI":"10.1016\/j.wasman.2012.03.029","article-title":"The Best-of-2-Worlds philosophy: Developing local dismantling and global infrastructure network for sustainable e-waste treatment in emerging economies","volume":"32","author":"Wang","year":"2012","journal-title":"Waste Manag."}],"container-title":["Sustainability"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2071-1050\/15\/17\/13175\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T20:45:01Z","timestamp":1760129101000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2071-1050\/15\/17\/13175"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,9,1]]},"references-count":19,"journal-issue":{"issue":"17","published-online":{"date-parts":[[2023,9]]}},"alternative-id":["su151713175"],"URL":"https:\/\/doi.org\/10.3390\/su151713175","relation":{},"ISSN":["2071-1050"],"issn-type":[{"value":"2071-1050","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,9,1]]}}}