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Slag viscosity is one of the most important physicochemical properties governing gas permeability,1,2) slag/ metal separation3,4) and desulfuration5) in the blast furnace. So viscous behavior of the slag plays a critical role in determining the stability and productivity in the blast furnace operation. Thus, it is necessary to understand the slag viscosity and the influence factors for improving the stability and productivity. Recently, iron ore containing high Al2O3 content has been largely used as the raw material in the blast furnace. Thus, the Al2O3 content in the slag will be certainly increased, and then the viscous behavior of the slag will be variation.6,7) It is well known that Al2O3 is an amphoteric oxide.8,9) Al2O3 behave as either a basic oxide or an acidic oxide depending on the slag composition.10–15) In order to improve the properties of slag containing high Al2O3 content, some researchers have investigated the effect of MgO addition on the viscosity.16) In CaO–MgO–SiO2–Al2O3 slag system, the viscosity decreases firstly and then increases with increasing MgO content.17) In CaO-MgO-SiO2-20 mass% Al2O3 slag system, the viscosity decreased significantly with the MgO content Influence of Al2O3 and MgO on the Viscosity and Stability of CaO– MgO–SiO2–Al2O3 Slags with CaO/SiO2 =1.0

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Influence of Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; and MgO on the Viscosity and Stability of CaO–MgO–SiO&lt;sub&gt;2&lt;/sub&gt;–Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Slags with CaO/SiO&lt;sub&gt;2&lt;/sub&gt;=1.0