We studied on the reducibilities of the several zinc compounds such as zinc oxide (ZnO), zinc-ferrite (ZnFe
2O
4), zinc-ferrous-silicate (ZnFeSiO
4) and zinc-silicate (Zn
2SiO
4) which were considered to be existed in lead smelter slag, under CO atmosphere. The samples and carbon powder were mixed with or without CaCO
3. Under these conditions, ZnO, ZnFe
2O
4, ZnFeSiO
4, and Zn
2SiO
4were reduced completely at about 800°, 920°, 1, 050°, and over 1, 150° respectively. By the results of the reducibility of zinc compound in lead slag of Kamioka Smelter, we considered that the greater part of zinc compound contained in slag was zinc-ferrous-silicate.
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