Placas De Circuito Impresso Caracterizac

This work has the purpose of characterizing four different lots of printed circuit boards (PCBs) of the scrap market, identifying and quantifying metals in them to establish a relation with the value associated with each of the lots. To achieve the proposed objective, comminution was performed in a cutting mill, followed by analysis in stereoscope to verify the release of metals. Subsequently, two routes of acid leaching for metal fraction characterization were tested: leaching in aqua regia, followed by leaching in nitric acid and also leaching in inverse aqua regia. The quantitative chemical analyses were performed by ICP-OES, and loss on ignition was also performed to quantify the polymer and ceramic fractions. For lot A, 33.6% of metal material was found, 42.01% for lot B, 24.27% for lot C, and 26.04 for lot D. The most abundant metal in all the lots was copper, and percentages of gold with high associated value were found. Considering 100% of the metal recovered in the lots studied, it would be possible to obtain for lot A 27,643.42 dollars, for lot B 8,585.22 dollars, for lot C 10,187.76 dollars and for lot D 6,409.17 dollars per ton. The difference between the values of the lots, which can reach 21,234.25 dollars when comparing A and D, justifies a better analysis of the plates, with subsequent separation by type before selling to recycling industries.