Recovering metals from motherboard and memory board waste through sulfuric leaching

Autor(es)

Goncalves Martins, Thamiris Auxiliadora ^[1] ; Kohler Caldas, Marcos Paulo ^[2] ; de Moraes, Viviane Tavares ^[3] ; Soares Tenorio, Jorge Alberto ^[1] ; Romano Espinosa, Denise Crocce ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Chem Engn, Polytech Sch, Lago St 250, BR-05508080 Sao Paulo, SP - Brazil

^[2] Fed Inst Educ Sci & Technol Espirito Santo IFES, Rodovia ES-010, Km 6-5, BR-29173087 Serra, ES - Brazil

^[3] Maua Inst Technol, Praca Maua 1, BR-09580900 Sao Caetano do Sul, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 9, n. 6 DEC 2021.
• Citações Web of Science: 0

Resumo

Printed circuit boards represent a source of urban mining for the reuse of resources in a circular economy. The number of metals in these boards can vary according to the model, year of manufacture, and function, making these scraps a complex residue for the application of recovery routes. In the present study, the leaching process was evaluated as an alternative to the magnetic separation step of the current hydrometallurgical routes for the recovery of iron and copper in these waste in which recovery of the metals present was carried out. The first stage of the hydrometallurgical route was leaching in sulfuric acid, for the recovery of iron. Subsequently, the copper recovery study was carried out, through the second stage of acid leaching in an oxidizing medium. The third stage was carried out in a nitric medium for the solubilization of the remaining metals. After using the same solid/liquid ratio for the solubilization of the metals present in the two types of boards, it was found that for the board with the highest concentration of metals that this ratio should be changed for greater extraction results. The percentage of leaching for the motherboard samples increased (to about 98 wt%) together with the residue/ acid ratio, and this showed that for each type of waste, according to its composition, the metal/acid ratio must be established for complete solubilization of the metals of interest. The recovery of this waste, depending on the type of scrap, can reach at least US\$ 1,230,000.00 /t waste. (AU)

• Processo FAPESP: 19/11866-5 - Desenvolvimento de processos inovadores para recuperação de metais críticos
• Beneficiário: Denise Crocce Romano Espinosa
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 12/51871-9 - Estudo de novas tecnologias e rotas de processamento para o tratamento e reciclagem de resíduos sólidos
• Beneficiário: Jorge Alberto Soares Tenório
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 18/07461-7 - Síntese e caracterização de nanopartículas de cobre a partir da lixiviação de resíduos de equipamentos eletroeletrônicos
• Beneficiário: Viviane Tavares de Moraes
• Modalidade de apoio: Auxílio à Pesquisa - Regular