Abstract
Type of inclusions in ESW metal and the relation between the existence ratios of these inclusions and CaF2 content in slag were investigated by scanning electron microscope observation and energy dispersive X-ray analysis. Existence ratio of oxide-type inclusion shows a minimum at the content of 8-19 mol% CaF2 in slag. The observation of the minimum can be attributed to the beginning of the formation of Ca-F bond at the content of 7-10 mol% CaF2 which is clarified by various spectroscopic methods such as X-ray photoelectron and emission X-ray spectroscopies. Refining effect of manganosilicate slags containing more than about 10 mol%. CaF2 on oxide inclusions decreases by the formation of Ca-F bond in the slags. Further, it is suggested that relations between existence ratios of oxide, oxysulfide and sulfide inclusions can be discussed in connection with sulfide capacity in slag.
