転炉を用いた脱りん脱炭連続処理プロセスの開発

抄録

The authors proposed a new refining process. In this process, the hot metal is dephosphorized and decarburized continuously with intermediate deslagging after dephosphorization in the same converter. The slag after decarburization is remained in the converter and reused to the dephosphorization of the next charge, so as to minimize the amount of exhausted slag. The experiments with 8-ton scale converter were performed to make clear the properties of this process. The high productivity was confirmed, because the dephosphorization rate could be increased with the high oxygen blowing rate and the addition of iron ore. The lime consumption was relatively low due to the dephosphorization with low basicity slag and hot recycling of decarburization slag to the next dephosphorization. The proper conditions, such as slag composition in dephosphorization, the rate of oxygen supply, bottom stirring and the intermediate deslagging rate, were also discussed by the basis of experimental results.