Abstract
Continuous pre-dephosphorization process with 300kg trough type furnace was examined; with the hot metal input rate: 33-38kg/min, oxygen blowing rate: 0.7Nm3/min, and flux rate: 4-5kg/min. The slag was co-current with the metal. As the result of one and two lance-operations, it became clear that the two lance-operation was more advantageous for slag-metal reactions as predicted from the characteristics of the resistance model. Moreover, from a theoretical analysis it was proved that the slag-metal reactions could proceed most effectively when the gas-liquid flow rate ratio { (oxygen blowing rate +CO gas generating rate) / hot metal rate} of each lance was kept equal.
By utilizing the result of this investigation it would be possible to develop a continuous pre-treatment process of hot metal with higher dephosphorization ability by optimizing the physical conditions of the process and by the operation such as the adoption of countercurrent.
