The influence of different calcium-based additions on desulphurisation andinclusion characteristics

The size, distribution, and composition of inclusions during the desulphuri sation and deoxidation steps were studied in laboratory experiments. 3 diff erent calcium-based desulphurisation mixtures were used. The number of incl usions and composition of inclusions were then determined using optical mic roscopy and scanning electron microscopy, respectively. The results show th at 2 of the 3 proposed desulphurisation mixtures managed to render lower an d roughly equivalent inclusion counts. The results also show that the compo sition of the inclusions in all 3 samples varied from the beginning to the end of the desulphurisation process. A desulphurisation mixture consisting of Al, CaO, CaCO3 and CaSi produced the overall best results with respect t o desulphurisation and inclusion characteristics.