（1. School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing 100083， China 2. ?Wide-thickness Plate Technology Department， Shougang Research Institute of Technology， Beijing 100043， China 3. Laboratory of Green Recyclable Process for Iron and steel Production Technology， Beijing 100043， China ）
Abstract：In order to research the problems of low phosphorus steel smelting and the phenomenon of increased phosphorus in the steelmaking process， the slag phase of converter steelmaking was studied by SEM and the microstructure and the phase proportion of C2S（2CaO·SiO2） in slag were analyzed. The results shows that dephosphorization is composed of "oxidation dephosphorization" and "solid phosphorus". The influence factors of phosphorus accumulation in steel slag are analyzed. SiO2 has an impact on dephosphorization by affecting C2S volume. High FeO content in slag will decompose the C2S2 phase and result in rephosphorization. The interaction of high temperature and FeO the solid phase will cause the decomposition of solid phosphorus. The melting point of solid phase of phosphorus can be controlled higherly than the molten steel， and the significant result of low temperature tapping in traditional thermodynamics can be obtained.
吕延春，，王新华，秦登平， ，王海宝，. 转炉炼钢渣磷元素的富集及影响因素[J]. 钢铁, 2017, 52(10): 29-37.
Lü Yan-chun，，，WANG Xin-hua，QIN Deng-ping，，WANG Hai-bao，. Enrichment and influencing factors of phosphorus in slag of converter steelmaking. Iron and Steel, 2017, 52(10): 29-37.
Farshid PAHLEVANI, Shin-ya KITAMURA, Hiroyuki SHIBATA and Nobuhiro MARUOKA.Distribution of P2O5 between Solid Solution of 2CaO?SiO2–3CaO?P2O5 and Liquid Phase[J].J ISIJ International, 2010, 50(6):822-827
[1]
Xiao YANG, Hiroyuki MATSUURA and Fumitaka TSUKIHASHI.Condensation of P2O5 at the Interface between 2CaO?SiO2 and CaO–SiO2 –FeOx –P2O5 Slag[J].J ISIJ International, 2009, 49(9):1298-1305
[3]
Kohei YAJIMA, Hiroyuki MATSUURA and Fumitaka TSUKIHASHI.Effect of Simultaneous Addition of Al2O3 and MgO on the Liquidus of the CaO–SiO2–FeOx System with Various Oxygen Partial Pressures at 1573K[J].J ISIJ International, 2010, 50(2):191-197
[2]
Farshid PAHLEVANI, Shin-ya KITAMURA, Hiroyuki SHIBATA and Nobuhiro MARUOKA.Distribution of P2O5 between Solid Solution of 2CaO?SiO2–3CaO?P2O5 and Liquid Phase[J].J ISIJ International, 2010, 50(6):822-827
[4]
Shinya FUKAGAI, Tasuku HAMANO and Fumitaka TSUKIHASHI.Formation Reaction of Phosphate Compound in Multi Phase Flux at 1573K[J].ISIJ International, 2007, 47(1)1:187, 2007, 47(1):187-195
[5]
Hironari KUBO, Kazuyo MATSUBAE-YOKOYAMA and Tetsuya NAGASAKA.Magnetic Separation of Phosphorus Enriched Phase from Multiphase Dephosphorization Slag[J].J ISIJ International, 2010, 50(1):59-66
[3]
Kohei YAJIMA, Hiroyuki MATSUURA and Fumitaka TSUKIHASHI.Effect of Simultaneous Addition of Al2O3 and MgO on the Liquidus of the CaO–SiO2–FeOx System with Various Oxygen Partial Pressures at 1573K[J].J ISIJ International, 2010, 50(2):191-197
[6]
Hiroyuki MATSUURA, Makio KURASHIGE, Masahiro NAKA and Fumitaka TSUKIHASHI.Melting and Solidifying Behaviors of the CaO–SiO2–FeOx Slags at Various Oxygen Partial Pressures[J].J ISIJ International, 2009, 49(9):1283-1287
[4]
Shinya FUKAGAI, Tasuku HAMANO and Fumitaka TSUKIHASHI.Formation Reaction of Phosphate Compound in Multi Phase Flux at 1573K[J].ISIJ International, 2007, 47(1)1:187, 2007, 47(1):187-195
[7]
Deo B.Halder J[J].Snoeijer B. A. Overbosch and R. Boom. Effect of MgO and Al2O3 Variations in Oxygen Steelmaking(BOF) Slag on Slag Morphology and Phosphorus Distribution . J Ironmaking and Steelmaking, 2005, 32(1):54-63
[5]
Hironari KUBO, Kazuyo MATSUBAE-YOKOYAMA and Tetsuya NAGASAKA.Magnetic Separation of Phosphorus Enriched Phase from Multiphase Dephosphorization Slag[J].J ISIJ International, 2010, 50(1):59-66
[6]
Hiroyuki MATSUURA, Makio KURASHIGE, Masahiro NAKA and Fumitaka TSUKIHASHI.Melting and Solidifying Behaviors of the CaO–SiO2–FeOx Slags at Various Oxygen Partial Pressures[J].J ISIJ International, 2009, 49(9):1283-1287
[7]
Deo B.Halder J[J].Snoeijer B. A. Overbosch and R. Boom. Effect of MgO and Al2O3 Variations in Oxygen Steelmaking(BOF) Slag on Slag Morphology and Phosphorus Distribution . J Ironmaking and Steelmaking, 2005, 32(1):54-63
2017, Vol. 52 
