Viscosity of slag determines the production efficiency, energy consumption and distribution of elements between metal and slag, which is very important for pyrometallurgy. Slag of gold-antimony ore blast furnace smelting has seldom been studied. In this paper, the viscosities of gold-antimony ore smelting slags of different composition have been studied by the rotating cylinder method. The results showed that, for a slag of 38.95% SiO_2, 16.17% CaO, 25.97% FeO, 10.25% Al_2O_3, 5.17% MgO, the viscosity can be decreased by reducing 3.24%-8.5% SiO_2 or increasing 3.31%-9.56% CaO content. Complex Si_xO_y~(z-) from SiO_2 acts as the main cause for the high viscosity in a slag of high SiO_2. The increasing of CaO causes the decreasing of the amount of Si_xO_y~(z-) and the O~(2-) dissociated from CaO breaks the complex Si_xO_y~(z-), which can decrease the viscosity. Viscosity of different composition slag in the appropriate range temperature can be calculated from the Arrhenius equation.
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