Preparation of Ferrosilicochromium by Silicothermic Reduction of Cr-Bearing Electroplating Sludge

In this study, a novel process for recovering Cr from Cr-bearing electroplating sludge (ES) was proposed, which involved the desulfurization stage and reduction-smelting stage. stage, decomposition of CaSO4 in ES promoted by adding certain amount carbon. It found that ratio increased first then decreased as increasing C/S (molar ratio) 0.5 to 2, while it monotonously temperature raised. The product with highest (89.71%) lowest residual sulfur (0.47 wt%) obtained when reaction 1100 ℃ 1.5. desulfurized deeply reduced Si. Si Cr2O3 metallic formed liquid Fe–Cr–Si alloy (ferrosilicochromium). ferrosilicochromium separated molten slag gravity, recovery ratios Fe reached 98.9% 98.7%, respectively. carbon contents prepared were 0.01 0.009 wt%, respectively, requirement commercial (C ≤ 0.02 S wt%). addition, SiO2 produced silicothermic reduction facilitated vitrification slag, harmless glassy finally obtained.