1973 Volume 59 Issue 3 Pages 414-430
The fundamental aspect of the development of the NRIM multi-stage trough type continuous steelmaking process and the results of its recent operations are presented in this paper. Though the scale of the plant used was small (hot metal flow rate 7.8t/hr), a suitable separation of the steelmaking reactions to each stage of the continuous steelmaking furnace and the know-how of its operation were satisfactorily obtained. The industrialization of this process is confirmed to be feasible. As the result of the separation, that is, silicon and phosphorus were mostly removed in the first stage so that the final carbon level was controlled mainly in the second stage, the product with phosphorus as low as 0.005%(dephosphorization ratio 96%) was obtained with comparable amount of lime to that of the conventional batch type steelmaking processes.
