MgO-FeO phase incorporated with CaO could potentially lead to expansion in a short time. 1 2 T he relationships between the petrological features ofThe objective of the present work is to establish the the Mg bearing RO phase in electric arc furnace slag, relationship between the petrological features of the Mg its hydrothermalreactivity, and the autoclave expansion bearing RO phase and autoclave expansion and hydrobehaviour of steel slag are discussed. T he Mg bearing thermal products. R O phase can be classi ed into M g poor wustite, Mg rich wustite, ferropericlase, and periclase, according to EXPERIMENTAL PROCEDURESthe FeO/MgO ratio in the RO phase. Both the reactivity of the M g bearing R O phase with water and its Steel slag samples expansion under autoclave conditions are controlled byThere is usually some free CaO in BOF slag, and this can the FeO/M gO ratio. Mg poor wustite phase remains clearly aVect the expansion of the material. For this reason, stable even after treatment at 5 M Pa for 72 h. In only EAF samples were selected for testing, since EAF slag contrast, Mg rich wustite and ferropericlase react with usually contains little free CaO. Several dozen EAF slag water to form brucite and undergo uniform microexpansamples from seven steel companies were examined and sion under autoclave conditions even though they have tested. After analysing the chemical compositions, the minpoorer reactivity with water than periclase. BCT /493 eral phases of all samples were characterised by polarised light microscopy, SEM-EDX, and XRD. The experimental Dr Qian

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