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Abstract
After high temperature reconstruction of converter steel slag, the content distributions of MgO are determined by chemical phase separation, and the decrystallisation degree of steel slag is tested by X-ray diffraction. The exothermic temperature of MgO crystallisation is measured combined with differential scanning calorimetry under heating rates of 5, 10, 15 and 20 K min−1, respectively. The results show that exothermic peak temperature of the MgO crystallisation increases with the increase of differential scanning calorimetry heating rates, mainly in the range of 1523–1618 K. The existence of mineraliser, manganese and phosphorus during the steel slag reconstruction can increase the crystallisation activation energy of free MgO, thus inhibit the crystallisation of MgO. The crystallisation reaction order of MgO increases with the increase of heating rates, but it still belongs to the first-order solid-state reaction. A mathematical model of the MgO crystallisation kinetics during the reconstruction process of steel slag is built.