1981 Volume 67 Issue 2 Pages 323-332
As far as we use a blast furnace to produce hot metal, it is most important to control dephosphorization for the improvement of the present steel making process. In view of this, many refining processes to control dephosphorization economically have been studied.
We investigated the refining process of molten iron by using sodium carbonate, mainly for dephosphorization, and obtained the following results,
(i) When the sodium oxide type slag is used, the simultaneous dephosphorization and desulfurization occur, because dephosphorization proceeds in spite of its very low total iron content in comparison with the calcium oxide type slag.
(ii) The degree of dephosphorization is affected by the content of carbon and silicon in molten iron as well as temperature.
(iii) The prospect for a new steel making process based on the treatment by sodium carbonate depends upon the establishment of a technique to control desiliconization of hot metal, the simultaneous dephosphorization and desulfurization by sodium carbonate, and the development of a sodium carbonate recovery process from the slag.