Abstract
To explore the feasibility of hot metal desulfurization using red mud, the sulfur distribution ratio (LS) between CaO-SiO2-Al2O3-Na2O-TiO2 slag and carbon-saturated iron is evaluated in this paper. First, the theoretical liquid areas of the CaO-SiO2-Al2O3 (-Na2O-TiO2) slag are discussed and the fluxing effects of Al2O3, Na2O, and TiO2 are confirmed. Then, LS is measured via slag-metal equilibrium experiments. The experimental results show that LS significantly increases with the increase of temperature, basicity, and Na2O content, whereas it decreases with the increase of Al2O3 and TiO2 content. Na2O in the slag will volatilize with high temperatures and reducing conditions. Furthermore, based on experimental data for the sulfur distribution ratio between CaO-SiO2-Al2O3-Na2O-TiO2 slag and the carbon-saturated iron, the following fitting formula is obtained: log L S = 45.584 Λ + 10568.406 − 17184.041 Λ T − 8.529
Highlights
Sulfur often deteriorates metal properties [1,2], especially metals’ toughness
CaF2 is widely added as an additive to decrease the melting point and improve the solubility of lime [5]
Niekerk and Dippenaar [5] determined that the Na2 O equivalent of CaO was 0.30, and adding Na2 O could significantly increase the sulfide capacity of silicate and lime-based slag
Summary
To realize the deep desulfurization of steel [3,4], the process of hot metal desulfurization has become an economical and efficient method [2]. During this process, traditional lime-based slag has a high melting point. CaF2 is widely added as an additive to decrease the melting point and improve the solubility of lime [5]. Pak and Fruehan [6] reported that the addition of Na2 O lowered the melting point and improved the fluidity of lime-based slag
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