Combining Recovering Iron with Activating the Residual Slag Process for Electric Arc Furnace (EAF) Slag

Electric arc furnace (EAF) slag is the byproduct of electric arc furnace in the process of metallurgy. In this paper, a recovering iron process combined with an activating residual slag process for EAF slag has been put forward. Researches show that increasing fineness of EAF slag is adverse to recover iron from the slag and 21.27% of the EAF slag could be separated as recovered iron concentrate with grade of 64.34%. The residual slag after magnetic separation process could be activated through mixing activating agent. Hemihydrates gypsum was the best activating agent to improve reactivity of the residual slag, which could meet the requirement of the first grade of steel slag powder in national standard. Then residual slag cements had been successfully prepared with 30% of activated residual slag and a 28-day compressive strength of 44.46MPa.