Tratamento físico-químico de placas de circuito impresso de computadores obsoletos da UFRN

• Autor(a) principal: Gomes, Arthur Mendes Mariano
• Data de Publicação: 2017
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/38712
• topic: placas de circuito impresso; água régia; processamento hidrotermal; lixo eletrônico; leaching; printed circuit boards; hydrothermal process; water regia; electronic waste; Engenharias.

The large amount of electronic waste produced as a result of the increasing use of electronic equipment has caused unsustainable problems for the environment due to the pollution generated by its constituents. Printed circuit boards, for example, have several precious metals (silver, gold, etc.), base metals (copper, tin, etc.) and heavy metals (lead, chromium, etc.). In order to minimize these environmental impacts, it is necessary to develop means of reuse of this type of waste. For this reason, the main objective of this work was to develop an alternative method for the extraction of metals through hydrothermal treatment and processing of PCB using royal water in low concentrations at high pressure and temperature. The plates were mechanically processed until they reached the powder morphology and were subsequently contacted with solutions of royal water at different concentration and temperature conditions in a high pressure environment for several time intervals. The leached material was analyzed gravimetrically to determine the percentages of leached mass and the tests were executed following a factorial experimental design and a kinetic study so that a statistical analysis of the achieved results was done later. It was found that the concentration and temperature were considered significant factors, as well as the interaction of these two factors, in relation to the response variable. The tests also showed that significant leaching rates were achieved using small concentrations of royal water.