Abstract: Titanium-bearing blast furnace slag (TBFS) and copperas are two major solid wastes discharged from pig iron and titania production with vanadium-titanium magnetite ore as feedstock. Co-disposal of the above two wastes is of great importance for the development of ferrotitanium industry. In this study, a novel process for rutile beneficiation was proposed by using TBFS and copperas. TBFS and copperas were co-roasted, where copperas was thermally decomposed into sulfur dioxide and ferric oxide, and the sulfur dioxide continued to react with the CaTiO₃ and titanium-bearing diopside in TBFS. During the sulfation reaction of TBFS, the calcium and magnesium was converted into corresponding sulfates, while titanium was beneficiated to rutile. The effects of process parameters on beneficiation were studied systematically. It was found that addition of Na₂SO₄ significantly enhanced the conversion efficiency of Ti. Under the optimal conditions, i.e. a mass ratio of copperas to TBFS of 2, Na₂SO₄ dosage of 10%, roasting temperature of 650℃, roasting time of 4 h, the conversion efficiency of Ti reached 98%. The content of rutile reached 8.6%, which can be further beneficiated by flotation. The addition of Na₂SO₄ promoted the formation of molten Na₃Fe(SO₄)₃, which was able to penetrate inside the TBFS and proceed sulfation reaction with inner TBFS. And gas-liquid-solid phase reactions facilitated the beneficiation of titanium.