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PC board scraps were leached to recover Cu, Ag, Au and Pd. Due to the high cost of the shredding and to avoid secondary pollution from dusts, board scraps were cut into 5×5cm 2 pieces. Nitric acid was used and effect of leaching parameters; the leachant concentration, temperature, time and L/S were studied and optimized using response surface methodology (RSM). Silver (87wt.%) and copper (98wt...