Mahmoud, M.H.H; Barakat, M.A - In: Renewable Energy 23 (2001) 3, pp. 651-662
A zero emission process was established by treatment of a spent liquor resulting from frequent pickling of copper alloy rods in sulfuric acid. The spent liquor contains 35 g l−1 copper, 25 g l−1 zinc, 1.1 g l−1 chromium, 45 g l−1 sulfuric acid, and 135 g l−1 total sulfate. These...