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Steel slag as byproduct of the steelmaking process, its discharge occupies much land and often causes circumstance problem, and therefore, the utilization of steel slag has been causing much attentions during past several decades all over the word. But owing to the poor grindability performance and tendency to pulverization, the utilization ratio of steel slag is very limited. It is reported the generation of the steel slag has already exceeded 13 billion tons until 2014 in China, but its utilization ratio is only around 10%.1) With the development of environmental protection policy, the requirement for utilization of steel slag are becoming very urgent. As well known, converter steel slag contains some available component like iron, manganese, and phosphorus coming from hot metal refining processing using basic oxygen converters. For the purpose to emission reduction and resource recovery, the treatment of steel slag by using carbothermal reduction or metallothermic reduction to recovery of valuable elements and dephosphorization has been studied. Li et al.2) investigated the recycling of iron element and dephosphorization at around 1 923 K and 2 073 K, respectively. Though the dephosphorization rate is 95%, vast energy supply to maintain high temperature is an adverse factor for carbothermal reduction. In addition, the formation of CO gas facilitate to form forming slag which restrict the deep reduction of FeO in the slag.3) For metallothermic reduction, the cost problem caused by the expensive metal aluminum is considered to be a restrictive Viscosity Property and Melt Structure of CaO–MgO–SiO2–Al2O3–FeO Slag System

Viscosity Property and Melt Structure of CaO–MgO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>–FeO Slag System