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Processamento de placas de circuito impresso de equipamentos eletroeletrônicos de pequeno porte

2013; Brazilian Chemical Society; Volume: 36; Issue: 4 Linguagem: Inglês

10.1590/s0100-40422013000400015

1678-7064

Sérgio de Souza Henrique Júnior, Felipe Pereira de Moura, Roger de Souza Corrêa, Júlio Carlos Afonso, Cláudio Augusto Vianna, José Luiz Mantovano,

Iron oxide chemistry and applications

ELECTRONIC DEVICES.A hydrometallurgical process applicable to printed circuit boards of small electrical and electronic devices was developed.This involved three leaching steps (60 o C, 2 h): 6 mol L -1 NaOH, 6 mol L -1 HCl and aqua regia.NaOH removed the resin and flame retardant that covered the circuit boards.HCl dissolved the most electropositive metals and a small amount of copper (~0.3 wt%).Aqua regia dissolved the noble metals.Silver precipitated as AgCl.Gold and platinum were quantitatively extracted with pure methylisobutylketone and Alamine 336 (10 % vol. in kerosene), respectively.Slow evaporation of the raffinate crystallized CuCl 2 .4H 2 O (89% yield).