Influence of basicity and Fe₂O₃ on crystallisation characteristics of CaO–MgO–SiO₂–Al₂O₃–Cr₂O₃–Fe₂O₃ system

Abstract

CaO–MgO–SiO₂–Al₂O₃–Cr₂O₃–Fe₂O₃ slag systems with different basicities and different Fe₂O₃ contents were prepared using reagent powders and experimented cooling from melt to 1400°C for crystallisation. X-ray diffraction, Scanning Electronic Microscopy and Energy Dispersive Spectrometer were used for slag sample characterisation. It was established that the basicity of the slag changed the mineralogical phases, while variation of Fe₂O₃ content in slag with the same basicity did not affect the main crystalline phases. The results showed that most of the Cr₂O₃ was incorporated into Mg(Al,Fe,Cr)₂O₄ spinel solid solution and content of Cr₂O₃ in spinel phase decreased with increasing of the basicity (CaO/SiO₂) and the Fe₂O₃ content.

Keywords:

• Crystallisation
• Chromium oxide
• Basicity
• Spinel solid solution