| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.24 ( April 1991 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Hot Metal Dephosphorization Treatment in Torpedo Car Yuki Nabeshima, Keizo Taoka, Sumio Yamada, Nozomu Tamura, Masuto Shimizu |
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Synopsis : Hot metal is dephosphorized in the torpedo car at Chiba Works. The main features of the process are (1) post-mixed flux injection, (2) improved torpedo-cleaning process and (3) use of large amount of oxygen gas. Post-mixed flux injection has reduced lime consumption, while the use of a large quantity of oxygen gas controls the temperature drop during dephosphorization. An investigation has disclosed that the dephosphorization behavior of the oxygen gas is nearly equivalent to that of iron oxide. With the establishment of this pretreatment system, the amount of hot metal dephosphorized now exceeds 250000 t/month, covering virtually all hot metal produced at Chiba Works. |
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