Verification of the theoretical considerations and numerical modeling of the powder injection process in conditions of pneumatic injection of ferroalloys into liquid cast iron

The problem of pneumatic powder injection into liquid alloys has been analyzed by authors in previous theoretical, model and numerical experiments what was reported in previous articles. Here an issue of semi-industrial hot experiments has been presented. The grey cast iron was melted in laboratory electric induction crucible furnace and then powdered ferrosilicon was pneumatically introduced into liquid bath. A method with lance not submerged in liquid was analyzed as better way in cases when less temperature decrease and less carrier gas introduction into molten metal is desirable e.g. for small metal volumes treatment. The results for various process parameters (carrier gas pressure, diphase jet concentration, ferroalloy grains parameters etc.) have been presented and compared with these obtained by the way of theoretical and numerical considerations. Both the typical steel lance and lance of new design (reported in earlier works) have been verified in semi-industrial conditions. The possibility of successful powder introduction as well as some hypotheses and mathematical assumptions have been proven during the researches. The practical guides how to perform properly the pneumatic powder injection process with non-submerged lance with good efficiency and other parameters have been presented, too. These results finish the wide (four years) experimental plan of development in pneumatic powder injection process to make it ready to wider industrial usage.