石灰系スラグからの復りん防止による溶銑脱りんの促進

概要

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In order to improve dephosphorization, rephosphorization behavior of hot metal which contacts with CaO-Fe_tO-SiO_2-CaF_2-P_2O_5 slag has been studied at 1350℃. The results obtained in this work are summarized as follows ; 1) The rate of rephosphorization in Ar proceeds faster than that in air. 2) The content of (Fe_tO) in slag required to prevent rephosphorization is about 1% for slag with CaO/SiO_2 of 4.66, and is about 2-3% for slag with CaO/SiO_2 of 2.51. 3) In dephosphorization process using injection method, addition of iron oxide to top slag, which increase (Fe_tO) contents in slag, is quite important for improving dephosphorization. 4) In dephosphorization of hot metal, the value of (T.Fe) is not available for index of oxygen potential in slag. Because the slag contains much iron particle with micron size. Therefore, the particle must be removed chemically before analyzing.
社団法人日本鉄鋼協会の論文
1992-05-01