抄録
Effect of a flux addition method on hot metal desulfurization by a mechanical stirring was investigated in a 1/12-water model and a 70 kg hot metal desulfurization tests. Following flux addition method was employed; top addition on bath surface at the first period of desulfurization, continuous addition from the top and powder blasting with nitrogen gas. Desulfurization rate of powder blasting is larger than continuous addition and top addition. The obtained aggregated slag (desulfurization flux) particle diameters after desulfurization were 0.76 mm (top addition) and 0.38~0.44 mm (powder blasting), respectively. Desulfurization behavior was analyzed assuming the interfacial area between the flux and the hot metal is proportional to the estimated aggregated slag particle size. Based on the analysis, the effect of powder blasting with nitrogen gas on improvement of desulfurization efficiency was interpreted to be the combined results of a) promotion of flux dispersion, avoiding aggregation at the time of flux addition and b) prevention of slag particle aggregation in hot metal during stirring.
