Recuperação de cobre de placas de circuito impresso através do processo de lixiviação em ácido sulfúrico

• Autor(a) principal: Silva, Gabriel Saraiva da
• Data de Publicação: 2022
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/70063
• topic: Recuperação de cobre; Lixiviação; Placa de circuito impresso

The production of electronic waste has been growing in the world along with technological development, which is a problem because the recovery measures for these materials do not grow in the same proportions. Brazil is one of the countries that produce the most electronic waste, and the system for recycling them is inefficient and almost non-existent. Given this problem, the Núcleo de Tecnologia e Qualidade Industrial do Ceará (NUTEC) in association with the Laboratório de Pesquisa em Corrosão (LPC) of the Departamento de Engenharia Metalúrgica e de Materiais at the Universidade Federal do Ceará, created a project in a partnership that aims to the development of e-waste recovery technology. This work is an integral part of this project and aims to develop a procedure with simple instrumentation that allows the recovery of copper from printed circuit boards and to identify the variables of this process. In this work, printed circuit boards from obsolete computers, already coarsely ground in a cutting mill, were separated into homogeneous samples and dissolved in aqua regia for 24 hours, of the resulting liquor was taken as a sample, and characterization was performed through the Inductively Coupled Plasma Optical Emission Spectrometry (ICP OES) analysis, and the rest of the material was burned and macerated, to carry out a complementary characterization with x-ray fluorescence, all the above to determine the total amount of copper in the samples. From the characterization, it was possible to verify that the composition of the material received was around 30% metals, 30% polymers, and 40% ceramics. After the characterization, a leaching procedure of 3 samples in a solution containing sulfuric acid in an oxidizing medium for 6 hours was elaborated and executed and the results were compared with those of the initial characterization to identify the efficiency of the process. The results had some variations, but an average copper recovery of 60% was found.