Study on desulfurization capacity of high alumina blast furnace slag at 1773 K using slag-metal equilibrium technique

In the current paper, we have determined the desulfurization ability of a CaO MgO SiO2 Al2O3 slag system using slag-metal equilibrium technique. The chemical composition of slag samples consists of Al2O3 in the range of 25 30 wt%, CaO/SiO2 ratio (0.8 1.6) and MgO (8 16 wt%). All the experiments are conducted at a temperature of 1773 K. The sulphur content in the slag as well as in metal after desulfurization reaction is analyzed using XRF (X-ray Fluorescence Spectroscopy) for calculating sulphur partition ratio (L-s) of the slags. The influence of Al2O3, CaO/SiO(2 )ratio and MgO content on L(s )have been studied. It is observed that L-s increase with an increase in CaO/SiO2 ratio and MgO content, but it reduces as the Al2O3 content increase in slag. Also, the amount of bridge oxygen ( [BO]) represented by (O-0) decreases with increase in basicity and MgO content. However, O-0 increases with increase in Al2O3. It is witnessed that the experimental values closely fit with the values obtained from corrected optical basicity model.