The volatilization behaviour of CaCl2-containing basic oxygen furnace (BOF) slags was investigated in laboratory at steelmaking temperature. During the melting process, the volatilization ratio was measured, and the volatile compounds were collected with some conductive tapes. Thermogravimetric analysis was conducted to clarify the volatilization of CaCl2-containing slags, and the volatilization ratio was also calculated by the thermodynamic software HSC. It was found that volatilization takes place in both CaCl2-containing and CaF2-containing BOF slags, but their influential mechanisms are different. FeCl2 is the main volatile compound in CaCl2-containing BOF slags. The increasing contents of CaCl2 and FeO in these slags are favourable for volatilization, while higher slag basicity plays the opposite role. In the case of CaF2-containing BOF slags, the volatilization compounds have little relation to the FeO content in the slags, and the volatilization ratio is smaller than that of CaCl2-containing BOF slag.
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References
1.
KimWHSohnIMinDJ.A study on the viscous behaviour with K2O additions in the CaO-SiO2-Al2O3-MgO-K2O quinary slag system. Steel Res Int. 2010;81(9):735–741. doi:10.1002/srin.201000067
2.
JinZLvJYangH.Effect of K2O on phase relation and viscosity of the CaO-SiO2-ZnO-FeO-Al2O3 system slags. Russ J Non-Ferrous Metals. 2020;61(2):153–161. doi:10.3103/S1067821220020078
3.
QiJLiuCJiangM.Role of Li2O on the structure and viscosity in CaO-Al2O3-Li2O-Ce2O3 melts. J Non-Cryst Solids. 2017;475:101–107. doi:10.1016/j.jnoncrysol.2017.09.014
4.
ShiCShinSZhengDet al.Development of low-fluoride slag for electroslag remelting: role of Li2O on the viscosity and structure of the slag. Metall Mater Trans B. 2016;47(6):3343–3349. doi:10.1007/s11663-016-0826-3
5.
ZhouLLiHWangWet al.Effect of Li2O on the behavior of melting, crystallization, and structure for CaO-Al2O3-based mold fluxes. Metall Mater Trans B. 2018;49(5):2232–2240. doi:10.1007/s11663-018-1327-3
6.
ChangZJiaoKNingXet al.Novel approach to studying influences of Na2O and K2O additions on viscosity and thermodynamic properties of BF slags. Metall Mater Trans B. 2019;50(3):1399–1406. doi:10.1007/s11663-019-01565-5
7.
HanFYuLWenGet al.Effect of Na2O on the sintering and melting behavior of CaO-SiO2-CaF2 slag. J Mater Res Technol. 2022;19:866–876. doi:10.1016/j.jmrt.2022.05.080
8.
KimHKimWHParkJHet al.A study on the effect of Na2O on the viscosity for ironmaking slags. Steel Res Int. 2010;81(1):17–24. doi:10.1002/srin.200900118
9.
KimHSohnI.Effect of CaF2 and Li2O additives on the viscosity of CaO-SiO2-Na2O slags. ISIJ Int. 2011;51(1):1–8. doi:10.2355/isijinternational.51.1
10.
LiFLiXYangSet al.Distribution ratios of phosphorus between CaO-FeO-SiO2-Al2O3/Na2O/TiO2 slags and carbon-saturated iron. Metall Mater Trans B. 2017;48(5):2367–2378. doi:10.1007/s11663-017-1023-8
11.
ShahbazianFSichenDSeetharamanS.The effect of addition of Al2O3 on the viscosity of CaO-‘FeO’-SiO2-CaF2 slags. ISIJ Int. 2002;42(2):155–162. doi:10.2355/isijinternational.42.155
12.
TakedaOOkawaraTSatoY.Development of a new viscometer based on rotating crucible method and viscosity measurement of SiO2-CaO-CaF2 system. ISIJ Int. 2012;52(9):1544–1549. doi:10.2355/isijinternational.52.1544
13.
ZaitsevAILeitesAVLrtvinaADet al.Investigation of the mould powder volatiles during continuous casting. Steel Res. 1994;65(9):368–374. doi:10.1002/srin.199401179
14.
ViswanathanNNFatemehSSichenDet al.Estimation of escape rate of volatile components from slags containing CaF2 during viscosity measurement. Steel Res. 1999;70(2):53–58. doi:10.1002/srin.199905600
15.
VazquezFJDe Los SantosEUMendoza-RangelJMet al.High performance reinforced concrete, corrosion-resistant into aggressive industrial environments. Rev Rom Mat. 2017;47(4):505–513.
16.
NielsenHPFrandsenFJDam-JohansenKet al.The implications of chlorine-associated corrosion on the operation of biomass-fired boilers. Prog Energy Combust Sci. 2000;26(3):283–298. doi:10.1016/S0360-1285(00)00003-4
17.
DavidssonKOAmandLELecknerBet al.Potassium, chlorine, and sulfur in ash, particles, deposits, and corrosion during wood combustion in a circulating fluidized-bed boiler. Energy Fuels. 2007;21(1):71–81. doi:10.1021/ef060306c
18.
ShahbazianFSichenDSeetharamanS.Viscosities of some fayalitic slags containing CaF2. ISIJ Int. 1999;39(7):687–696. doi:10.2355/isijinternational.39.687
19.
WangHYangLLiGet al.Effects of B2O3 and CaF2 on melting temperatures of CaO-SiO2-Fe2O3 system fluxes. J Iron Steel Res Int. 2013;20(6):21–24. doi:10.1016/S1006-706X(13)60106-5
20.
ZhangXLiuCJiangM.Molecular dynamics simulations of melt structure properties of CaO-Al2O3-Na2O slag. Metall Mater Trans B. 2021;52(4):2604–2611. doi:10.1007/s11663-021-02184-9
21.
LiTLiGLiuYet al.Effect of MgO on the fluoride vaporization and crystallization of CaF2-CaO-Al2O2-(MgO) slag for vacuum electroslag remelting. J Therm Anal Calorim. 2022;147(20):11445–11455. doi:10.1007/s10973-022-11347-y
22.
ZhaoZZhaoJTanZet al.The volatilization behaviour of typical fluorine-containing slag in steelmaking. R Soc Open Sci. 2020;7(8):200704. doi:10.1098/rsos.200704
23.
LiuYRaoJLiGet al.Dissolution of Al2O3-C bricks in 45 wt% CaO-45 wt% SiO2-x wt% CaF2-(10-x) wt% Na2O slag. Ceram Int. 2022;48(13):19068–19072. doi:10.1016/j.ceramint.2022.03.195
24.
ZhaoJWangZZhaoZet al.Influence of fluoride evaporates on melting point of molding powder for continuous casting. Iron Steel. 2019;54(8):181–186. doi:10.13228/j.boyuan.issn0449-749x.20180459.
25.
LuRLiGLiuCet al.Effects of slag composition and additive type on desulfurization of rejected electrolytic manganese metal scrap by Na2O-containing electroslag. J Iron Steel Res Int. 2021;28(12):1515–1529. doi:10.1007/s42243-021-00680-5
26.
TongZFQiaoJLJiangXY.Kinetics of Na2O evaporation from CaO-Al2O3-SiO2-MgO-TiO2-Na2O slags. Ironmak Steelmak. 2017;44(4):237–245. doi:10.1080/03019233.2016.1210354
27.
JuJJiGTangCet al.The effect of Li2O on the evaporation and structure of low-fluoride slag for vacuum electroslag remelting. Vacuum. 2021;183:109920. doi:10.1016/j.vacuum.2020.109920
28.
ZhengDLiJShiC.Development of low-fluoride slag for electroslag remelting: role of Li2O on the crystallization and evaporation of the slag. ISIJ Int. 2020;60(5):840–847. doi:10.2355/isijinternational.ISIJINT-2019-575
29.
YanZDengZZhuM.Effect of CaCl2 addition on the viscosity of CaO–SiO2–FeOx steelmaking slag system. Metall Mater Trans B. 2021;52(4):2474–2483. doi:10.1007/s11663-021-02199-2
30.
YanZDengZZhuM.Effect of CaCl2 addition on phosphorus distribution between CaO-SiO2-FeOx-P2O5 slag and carbon-saturated iron at steelmaking temperature. Metall Mater Trans B. 2021;52(4):2806–2815. doi:10.1007/s11663-021-02236-0
31.
YanZDengZZhuMet al.Effect of CaCl2 addition on the melting behaviors of CaO-SiO2-FeOx steelmaking slag system. Metall Mater Trans B. 2021;52(2):1142–1153. doi:10.1007/s11663-021-02088-8
32.
YaoXYuQBXieHQet al.The production of hydrogen through steam reforming of bio-oil model compounds recovering waste heat from blast furnace slag. J Therm Anal Calorim. 2018;131:2951–5962. doi:10.1007/s10973-017-6804-4
33.
XieHQLiRQWangZYet al.Hydrogen production of bio-oil steam reforming combining heat recovery of blast furnace slag: thermodynamic analysis. Int J Hydrog Energy. 2019;44(47):25514–25523. doi:10.1016/j.ijhydene.2019.08.014
34.
ForoulisZA.Corrosion in chlorine environments. Anti-Corros Methods Mater. 1988;35(6):4–12. doi:10.1108/eb020667
35.
QuZZhongRWangLet al. Research progress on high temperature corrosion mechanism of waste incineration power generation boiler, IOP Conference Series: Earth and Environmental Science. IOP Publishing, 2020; 012008.
36.
AratoTTokudaMOhtaniM.Measurement of the activity of FeTO in Na2O-CaO-SiO2-FeTO and CaO-CaCl2-FeTO melts by the EMP method. Trans. Jpn Inst. Metals. 1984;25(9):649–656. doi:10.2320/matertrans1960.25.649
37.
TurkdoganET.Physical chemistry of high temperature technology. New York: Academic Press; 1980.
38.
ShahbazianFSichenDMillsKCet al.Experimental studies of viscosities of some CaO-CaF2-SiO2 slags. Ironmak Steelmak. 1999;26(3):193–199. doi:10.1179/030192399677068
39.
WangCZhangJLiuZet al.Effect of chlorine on the viscosities and structures of CaO-SiO2-CaCl2 slags. Metall Mater Trans B. 2016;48(1):328–334. doi:10.1007/s11663-016-0846-z
40.
ParkJHKoKYKimTS.Influence of CaF2 on the viscosity and structure of manganese ferroalloys smelting slags. Metall Mater Trans B. 2014;46(2):741–748. doi:10.1007/s11663-014-0269-7
41.
GuilloryJK.CRC handbook of chemistry and physics, 2009-2010. 90th ed.Boca Raton: CRC Press; 2009.
