DISTRIBUTION EQUILIBRIA OF SELENIUM BETWEEN LIQUID COPPER AND NA2O-B2O3-CAO SLAGS

The effect of CaO additions on selenium distribution between sodium-borate slag and copper metal phases was studied at 1473 K under reducing conditions. It was noted that with increase in CaO content (10 to 50 mass%) in slag, the Se distribution coefficient increases. It also increases with increase in initial Se concentration in Cu (0.35 to 0.45 mass%) The results show that the Se distribution coefficient 'L' increased by about two times (3 to 5.9) on addition of 50 mass%CaO to sodium-borate slag (Na2O mass%/B2O3 mass% = 0.86) for Cu-0.45 mass% Se alloy.