Melting temperature and viscosity-temperature characteristics ofAl2O3-CaO base pre-molten re.ning slag

XU Ji-fang, ZHANG Jie-yu, SU Li-juan, SHENG Min-qi, WENG Wen-ping

Journal of Iron and Steel Research ›› 2015, Vol. 27 ›› Issue (8) : 17-23.

Journal of Iron and Steel Research ›› 2015, Vol. 27 ›› Issue (8) : 17-23. DOI: 10.13228/j.boyuan.issn1001-0963.20140208

Melting temperature and viscosity-temperature characteristics ofAl2O3-CaO base pre-molten re.ning slag

  • XU Ji-fang1, ZHANG Jie-yu2, SU Li-juan1, SHENG Min-qi1, WENG Wen-ping1
Author information +
History +

Abstract

Liquidus temperature of Al2O3-CaO base pre-molten refining slag was estimated from the activation energy for viscous flow, effects of wMgO, wCaO/wAl2O3 and wSiO2 on the liquidus temperature of slag were investigated. The estimated results were verified by melting experiments and theoretically calculated using the FactSage Software. Differences and connections of melting temperature and viscosity-temperature characteristics were analyzed. The results indicate that all of wMgO, wCaO/wAl2O3 and wSiO2 had obvious influence on the liquidus temperature of slag. The liquidus temperature decreased with increasing the MgO content, and following by an increase with further increasing wMgO, the trends that the liquidus temperature changed with wCaO/wAl2O3 and wSiO2 were the same as the trend that the liquidus temperature changed with wMgO. While wMgO is between 4% and 6%, wCaO/wAl2O3 is between 4% and 6%, and wSiO2 is between 6% and 10%, the characteristic temperatures of slag are suitable. The results also indicate that the variation of the characteristic temperatures for slag estimated from different method is agreed with the theoretical analysis. The finding confirms that estimate the liquidus temperatures from activation energies for viscous flow is reliable. And the liquidus temperature estimated from the activation energy for viscous flow was fall in between the value calculated using the thermodynamic software FactSage and the value verified by melting experiments.

Key words

refining slag / viscosity-temperature characteristics / FactSage / liquidus temperature

Cite this article

Download Citations
XU Ji-fang, ZHANG Jie-yu, SU Li-juan, SHENG Min-qi, WENG Wen-ping. Melting temperature and viscosity-temperature characteristics ofAl2O3-CaO base pre-molten re.ning slag[J]. Journal of Iron and Steel Research, 2015, 27(8): 17-23 https://doi.org/10.13228/j.boyuan.issn1001-0963.20140208

References

[1]. Paulo C E, Remy J, Christoph W, et al. Novel fluxing agents for slags in secondary steel ladles to improve refractory life time and steel quality [J]. Technol Metal Mater Miner, 2011, 8(4): 285.
[2]. Boettinger W J, Kattner U R, Moon K W, et al. DTA and heat-flux DSC measurements of alloy melting and freezing [M]. Amsterdam: Elsevier, 2007.
[3]. Mills K C, Yuan L, Jones R T. Estimating the physical properties of slags [J]. J. S. Afr. I. Min. Metall., 2011, 111(10): 649.
[4]. Seetharaman S, Du S C. Estimation of the viscosities of binary metallic melts using Gibbs energies of mixing [J]. Metall. Mater. Trans. B, 1994, 25(4): 589.
[5]. Seetharaman S, Sridhar S, Du S C, et al. Estimation of liquidus temperatures for multicomponent silicates from activation energies for viscous flow [J]. Metall. Mater. Trans. B, 2000,31(1): 111.
[6]. Wang Z, Shu Q F, Chou K C. Estimation of liquidus temperature for B2O3 and TiO2-containing fluoride-free mold fluxes from activation energy for viscous flow and DTA measurements [J]. Canadian Metallurgical Quarterly, 2013, 52(4): 405.
[7]. Xu J F, Tang L, Sheng M Q, et al., Determination of liquidus temperatures from viscosity for CaO-Al2O3 based slags [C]. // 4th international symposium on high-temperature metallurgical processing. Hoboken: John Wiley & Sons, Inc., 2013.
[8]. Xu J F, Zhang J Y, Jie C, et al. Experimental measurements and modeling of viscosity in the CaO-Al2O3-MgO slag system [J]. Ironmaking and Steelmaking, 2011, 38(5): 329.
[9]. Xu J F, Zeng T, Sheng M Q, et al. Viscosity of low silica CaO-5MgO-Al2O3-SiO2 slags [J]. Ironmaking and Steelmaking, 2014,DOI: 10.1179/1743281213Y.0000000142
[10]. Bale C W, Chartrand P, DegterovS A, et al. FactSage thermo-chemical software and databases[J]. Calphad, 2002, 26(2): 189.
[11]. 徐冉, 宋波, 毛璟红. CaO-SiO2-Al2O3 -MgO-TiO2钢渣体系熔化性能[J]. 北京科技大学学报,2010, 32(11): 1422.
[12]. Mohanty U K, Behera R C. Fusion behaviour of synthetic aluminothermic ferro-chrome slags [J]. ISIJ Int., 2003, 43(12): 1875.
[13]. Jonsson P G, Jonsson L, Du S C. Viscosities of LF slags and their impact on ladle refining [J]. ISIJ Int., 1997, 37(5): 484.
[14]. Hallstedt B. Thermodynamic assessment of the CaO-MgO-Al2O3 system [J]. J. Am. Ceram. Soc., 1995, 78(1): 193.
[15]. Eriksson G, Pelton A D. Critical evaluation and optimization of the thermodynamic properties and phase diagrams of the CaO-Al2O3, Al2O3-SiO2, and CaO-Al2O3-SiO2 systems [J]. Metall. Mater. Trans. B, 1993, 24(5): 807.
[16]. 许继芳, 盛敏奇, 万康, 等. CaO-5%MgO-Al2O3- SiO2-0.5FeO熔渣体系低SiO2区域熔化性能研究[J] 钢铁, 2014, 49(2): 19.
[17]. Haynes W M. CRC handbook of chemistry and physics (94th edition) [M]. Clevland: CRC Press, 2013.

Funding

National Natural Science Foundation of China ( NSFC )

42

Accesses

0

Citation

Detail

Sections
Recommended

/