Copper Transfer from Molten Iron to Sodium Sulfide through Silver

抄録

The transport phenomena of copper through successive phases of molten iron, silver and sodium sulfide has been investigated at 1473 K in order to investigate the possibility of copper removal in iron. The dependence of the distribution ratio of copper between sodium sulfide and iron, L_Cu (=(mass%Cu)_{in Na2S}/[mass%Cu]_{in Fe}) on the sulfur content of iron is investigated at 1473K. Silver can keep iron from being sulfurized, which enables to maintain the high copper capacity of sodium sulfide. For this reason, the L_Cu value increases with an increase of sulfur potential. The copper transfer proceeds at lower 0.1 mass%Cu in iron, and the copper content of iron decreases to 0.068 mass%. The silver also prevents sulfur from being transferred into the iron, and the sulfur content of iron can be kept lower.