Electrolytic Reduction of Chromium (VI) and Copper Using Coke Electrodes

摘要

Solutions containing Cr(6+) and sulfuric acid are used in a number of surface-finishing operations. Substantial quantities of chromium and copper are lost and pollution problems are created when the spent solutions are discarded. To minimize the undesirable environmental effects while improving secondary resource recovery technology, the Bureau of Mines is conducting research to detoxify and recover metals from these solutions. Spent etchants are treated to remove copper and reduce Cr(6+) to Cr(3+) in an electrolytic cell.