The Use of High-sulfur Coal in Copper Electrowinning.
Proc 1st Int'l Conf on Proces & Util of High Sulfur Coals Amsterdam 1985 :739-749
Research has been conducted to lower the energy requirement in copper electrowinning by replacing the anodic water oxidation reaction with a coal slurry oxidation system in a combined electrolysis cell. The cell, which employs a membrane to separate the two half-cells, was operated at 60 deg. C at a cell voltage of approximately 0.5 V. This represents a 67-pct reduction in voltage from the 1.5 V required for conventional electrowinning. Using acetone washing and baking, the low-voltage electrolysis using the high-sulfur Pittsburgh No. 8 Coal has been conducted for up to 102 h. Analytical results showed that the character of the coal remaining after electrolysis was only slightly lower in heat value while being significantly reduced in ash and sulfur content compared with the feed coal. Based upon the decrease in cell voltage, a decrease in the net cost of electrolysis energy could be achieved.
Proc. 1st Int'l Conf. on Proces. & Util. of High Sulfur Coals, Amsterdam, 1985, PP. 739-749