The Study of Hot Metal Dephosphorization by Replacing Part of Lime with Limestone
The study of hot metal dephosphorization by replacing part of lime with limestone at temperature of 1350–1400 °C has been carried out in this work, and the effects of slag temperature and substitution proportion of limestone were examined. Moreover, the influence of limestone decomposition and dissolution on the dephosphorization rate of hot metal was also investigated. It was found that adding limestone instead 50% in mass of lime and the intensive endothermic reaction of limestone decomposition would reduce the slag temperature and increase the slag viscosity. The dynamic condition of dephosphorization was obviously deteriorated, and the dephosphorization rate of hot metal decreased at 1350 °C, while the thermodynamic condition of dephosphorization could be improved and the dephosphorization rate of hot metal increased at 1400 °C.
KeywordsDephosphorization Limestone Hot metal Decomposition
The authors gratefully acknowledge the National Natural Science Foundation of China (51574065, 51574066, 51774072 and 51774073) and the National Key R&D Program of China (No. 2017YFB0304201, 2017YFB0304203, 2016YFB0300602) which have made this research possible.
- 1.Xuan XY, Shi S, Qi X, Cai JW (2015) Study on dephosphorization of high-phosphorus hot metal in CaO–SiO2–FeO–Na2O–Al2O3 slag system. Ming Metall 24(2):51–54Google Scholar
- 4.Bo H, Dong JJ, Ren QQ, Zhang YZ (2016) Effect of activity and microstructure of lime on dephosphorization of hot metal. Special Steel 37(5):10–13Google Scholar
- 5.Pan Y, Wen G, Zhou H, Tang P, Hou Z (2016) Study on final slag composition control for highly efficient dephosphorization of 80 t converter in CISC. Steelmaking 32(1):15–19Google Scholar
- 7.Pan C (1997) The metallurgical effects of activated lime made by rotary kiln. Steelmaking 13(3):24–28Google Scholar
- 8.Qing DP, Yang JP, Wei SH, Zhang JS, Sun JG (2014) Analysis and process practice on steelmaking technology of 100 t top-blown oxygen converter by limestone for slag making. Special Steel 35(5):34–37Google Scholar
- 9.Dong DX, Feng J, Nian W, Li H, Liang M (2013) Experimental study on using limestone instead of lime for slagging in 60 t converter. China Metall 23(11):58–62Google Scholar
- 10.Huang XH (2010) Principles of steel metallurgy. Metallurgical Industry Press, BeijingGoogle Scholar