製鋼スラグにおける燐酸の分配

概要

論文の詳細を見る
Most of the steelmaking slag compositions are located in 2CaO-SiO_2 (C_2S) saturated region, and it is known that in solid C_2S phase, 3CaO-P_2O_5 (C_3P) can be dissolved. By using this phenomenon, during the dephosphorization treatment, P_2O_5 in liquid slag phase can be kept in low concentration as it dissolves in the precipitated solid C_2S phase. In this report, mineral structure and phosphorous content in each phase were investigated by EPMA for hot metal dephosphorization slag and BOF decarburization slag. The following results were obtained; (1) in the as received granular dephosphorization slag, the basicity in the observed area did not increase although the basicity by chemical analysis increased. In the annealed dephosphorization slag and BOF decarburization slag, the basicity in the observed area were almost the same value as the basicity by chemical analysis, (2) in hot metal dephosphorization slag, partition ratio of phosphorous between liquid slag and C_2S phases increased as the increase in the basicity and their values were very similar to that observed in laboratory experiments, although the partition ratio in BOF decarburization slag were very high. According to these results, the importance to increase the lime dissolution rate in slag can be pointed out for hot metal deposporization treatment.報文Original Paper
東北大学の論文