脱リンスラグの凝固初期段階における結晶化とリン分配(<特集>マルチフェーズフラックスを利用した新精錬プロセス技術)

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Basicity and the amount of Fe_tO were investigated for their effects on the crystallization behavior of the simulated dephosphorizing slags. Twelve kinds of slags were prepared (C/S=1.0-2.5, Fe_tO=10-20%, P_2O_5=5%). In the present experiment, the Hot Thermocouple Technique was used to melt and quench the samples. After quenching, the microstructure of the slag and the distributions of elements were examined by SEM and EDS analysis. The diameter of the crystal which precipitated in the sample increased with increasing basicity (C/S) and decreasing Fe_tO content. In addition, glassy regions were observed in the two samples whose Fe_tO content was 20% and whose basicity was 1.0 or 1.5. The samples (10% Fe_tO, 5%P_2O_5), whose basicity was 1.0 (sample-1) precipitated as a monocalcium silicate (CaO・SiO_2); the sample (10% Fe_tO, 5% P_2O_5) whose basicity was 1.5 (sample-4) precipitated as a dicalcium silicate (2CaO・SiO_2). In higher Fe_tO (15-20%) slags, the crystals of the solid solution between 3CaO・P_2O_5 and 2CaO・SiO_2 ((C_3P-C_2S)ss) were observed. When the amount of CaO increased from C/S=1.5 to C/S=2.5, 2CaO・SiO_2 appeared with phosphorous content, but phosphorous was not found in CaO・SiO_2.
社団法人日本鉄鋼協会の論文
2009-03-01