固体CaO-溶融スラグ界面におけるP_2O_5含有相の微視的生成機構(<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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It is quite important to reveal the microscopic reaction mechanisms and the role of the solid and liquid phases in the solid CaO coexisting flux in the hot metal dephosphorization process. In the present study, solid CaO piece and FeO_x-CaO-SiO_2-P_2O_5 slag with various FeO_x and P_2O_5 contents, and CaO/SiO_2 ratios of the slag were reacted at 1573 and 1673K. The interface between solid CaO and molten slag was observed and analyzed by SEM/EDS. Microscopic reaction mechanisms between solid CaO and molten slag was discussed with changing reaction times, slag compositions and temperatures. The CaO-FeO_x phase adjacent to solid CaO, and the CaO-SiO_2 or CaO SiO_2-P_2O_5 solid phase coexisting with the FeO_x-CaO-SiO_2 liquid slag next to the CaO-FeO_x phase were observed for all slag compositions, temperatures and reaction times. Phosphorus was condensed as 2CaO・SiO_2-3CaO・P_2O_5 phase more easily in the case of higher CaO/SiO_2 ratio and higher FeO_x content in slag. There was a linear relationship between P_2O_5 content in 2CaO・SiO_2-3CaO・P_2O_5 phase and the distance from CaO-FeO_x phase to 2CaO・SiO_2-3CaO・P_2O_5 phase. The P_2O_5 content increased from CaO-FeO_x boundary toward bulk slag, and P_2O_5 content in the condensed phase near the CaO-FeO_x phase increased with increasing reaction time. This P_2O_5 concentration gradient tended to diminish. These results suggest that the condensation of phosphorus as 2CaO・SiO_2-3CaO・P_2O_5 phase was controlled by P_2O_5 diffusion from bulk slag to reaction interface, not by absorption of P_2O_5 into 2CaO・SiO_2 particle.
2009-03-01

固体CaO-溶融スラグ界面におけるP_2O_5含有相の微視的生成機構(<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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