CaO-CaF_2 系フラックスを用いた含クロム溶銑の脱りんの最適フラックス組成と酸化条件

概要

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Removal of phosphorous from chromium-containing hot metal by using CaO-CaF_2-based fluxes was investigated at 1480±20℃. Experiments were carried out using a 300kg induction furnace in which the fluxes were injected into the metal by using a gas mixture of O_2+Ar. Experimental results showed that the optimum ratios of CaO/CaF_2 and O_2/(CaO+CaF_2) for dephosphorization were approximately 1/1 and 40 Nl/kg, respectively. Under these conditions, about 50 percent of phosphorous was removed by using 70kg/ton of the flux from the metal containing ∿6mass% of carbon and 28∿29mass% of chromium. The contents of Cr_2O_3 of the slag after the treatment were as low as 1∿2mass%. When the ratio of O_2/(CaO+CaF_2) was increased to more than 40Nl/kg, the loss of chromium by oxidation was increased without any favorable effect on the degree of dephosphorization. In addition, when chromium contents are more than 17mass%, the observed value of L_P((mass%P)/[mass%P]) was good agreement with the calculated one on the assumption that the oxygen potential is determined by the reaction of CaO・Cr_2O_3 formation.
社団法人日本鉄鋼協会の論文
1992-06-01