Several models have been proposed to estimate the viscosity of molten slag using optical basicity. In this work, a new method for viscosity estimation of silicate slag using optical basicity has been proposed. The temperature dependence of viscosity was described by the general Arrhenius equation, and the contributions of bridging oxygen (O 0 ), non-bridging oxygen (O 2 ) and free oxygen (O 22 ) to viscous activation energy in this equation were taken into account. Compositions of three types of oxygen were calculated from optical basicity using the Toop-Samis model combined with the method proposed by Ottonello and Moretti. The present method has been applied to estimate the viscosity of silicate slag in CaO-FeO-MgO-MnO-SiO 2 system. The comparison between estimated and experimental values shows good agreements, with a mean deviation of ,20%.

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