CLOGGING-FREE NOZZLE CONDITIONS AND METALLURGICAL EFFECTS OF POWER INJECTION PRACTICE IN HOT METAL PRETREATMENT.

Abstract

Studies on power injection method and its metallurgical effects on hot metal pretreatment were carried out. To avoid the nozzle clogging, smooth powder transport from powder dispensor to nozzle is an important factor for powder injection practice and linear gas velocity higher than 330 m/s is necessary for gas stirring practice. The effective desiliconization and dephosphorization in hot metal can be obtained by injection method. Static pressure available in injection method, together with increasing interfacial area, increasing transitory reactions and preventing fume loss, accelerates desiliconization or dephosphorization in hot metal.