2017 Fiscal Year Final Research Report
Thermochemical properties of low-basicity dephosphorization slags -Liquidus compositions and activities in CaO-SiO2-P2O5-FeO heterogeneous slags-
| Project/Area Number |
15K06524
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Metal making/Resorce production engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Research Collaborator |
MIWA Kohei
MATSUGI Ryota
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | 低塩基度スラグ / 状態図 / 活量 / リン分配比 |
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| Outline of Final Research Achievements |
In steelmaking processes, there are incentives to reduce slag volume and CaO consumption. Towards better understanding of the phosphorus removal from hot metal with low-basicity slags, electrochemical technique incorporating MgO-stabilized zirconia was conducted to measure simultaneously the activities of FeO and P2O5 within heterogeneous CaO-SiO2-P2O5-FeO slags. The FeO activity was fairly insensitive to the variation of Ca3P2O8 content in solid solutions between Ca2SiO4-Ca3P2O8, while the P2O5 activity increased with an increase in Ca3P2O8 content. In this study, the liquidus compositions were also determined in the quaternary system CaO-SiO2-P2O5-FexO at 1573 K. By using the present experimental results, phosphorus distribution ratios were estimated between molten slag and carbon-saturated iron. The relationship between phosphorus distribution ratio and FeO content in molten slag was consistent with the phase diagram of the pseudo-ternary CaO-(SiO2+P2O5)-FeO system.
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| Free Research Field |
化学熱力学
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