Abstract
The steelmaking process results in the by-product formation of electric arc furnace slag (EAFS). Slag is recovered at two different stages of the steelmaking process, the first recovery is black and the second is white mainly consisting of SiO2, CaF2, and CaO. Steel slag is a solid waste produced in the metallurgical industry. The present research focuses on the white slag from SONASID-Jorf steel in Morocco for preparation of fluorapatite (Ca5(PO4)3F)-tetracalcium phosphate (Ca4(PO4)2O; TTCP) phases. These phases were successfully synthesized by activated slag with alkali activator NaOH (Sodium hydroxide) and using a wet precipitation method with molar ratio of Ca/P = 1.67. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy measurement, and scanning electron microscopy (SEM) analysis techniques were performed on the samples to characterize the mineralogical and microstructural properties. The characterization of the developed phases indicates the formation of mixtures of dicalcium silicate (Ca2SiO4) with reinhardbraunsite (Ca5((SiO)4)2OH2) and cuspidine (Ca4Si2F2O7) phases in the white slag activated with alkali activator NaOH. Moreover, indicates the formation of the fluorapatite-TTCP phases synthesized by wet precipitation method. The micrographs obtained by SEM show the morphology of rounded particles in the form attributed to fluorapatite phase and like woven nets attributed to tetracalcium phosphate.
doi: 10.17756/nwj.2023-s2-014
Citation: Agourrame H, Ouzoun F, Ez-zaki H, Khachani N, Diouri A. 2023. Synthesis of Fluorapatite-tetracalcium Phosphate Mixtures from Electric Arc Furnace Slag. NanoWorld J 9(S2): S81-S86.
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