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Synthesis of Cordierite Powder from Blast Furnace Slag

We report a new process of synthesizing cordierite powder from blast furnace (BF) slag developed by using sol-gel route. The phase transformation of dried gel calcined under different temperatures was investigated by XRD and FTIR. It was found that one complicated silicic acid-sulphuric solutions system containing cations of Al3+ and Mg2+ was formed as the precursor of the cordierite by acid treatment of the slag. Cordierite powders with α-cordierite as the main crystalline phase can be obtained when dried gel was calcined in the 1200°-1300°C temperature range. A viable technology to recover the major constituents from BF slag was provided.