“…If there is no FeO contained in the slag, a small amount of volatile compounds can still be generated, and the volatilization ratios of the CaF 2 -containing and CaCl 2 -containing slags are very close. Similar results were obtained by Wang et al [39] and Park et al [40] It is noted that in the studies of Wang et al [39] and Park et al [40], the volatilization ratios of CaCl 2 and CaF 2 were calculated according to the composition changes of the slags. In contrast, the total mass change of the CaCl 2 -containing BOF slag system was measured in the present study.…”
Section: Resultssupporting
confidence: 85%
“…Even though, the FeO content was still found to have a significant impact on the volatilization behaviours of the BOF slag. Since almost no FeO was contained in the slags of Wang et al [39] and Park et al [40], the volatilization behaviours of CaCl 2 -containing BOF slag system should be different in this study. Figure 7. Effect of FeO content on measured volatilization ratio.…”
Section: Resultsmentioning
confidence: 97%
“…Park et al [40] proposed that SiF 4 might be the main volatile compound of CaO–SiO 2 –MnO–CaF 2 slag, and the volatilization ratio of this slag was smaller than 15%. Meanwhile, Wang et al [39] pointed out that the volatilization ratio was lower than 15% in the case of CaO–SiO 2 –CaCl 2 slag. Based on the study of Park et al [40], Wang et al [39] believed that volatile gas such as SiCl 4 would be generated from the CaCl 2 -containing slags.…”
Section: Resultsmentioning
confidence: 99%
“…Meanwhile, Wang et al [39] pointed out that the volatilization ratio was lower than 15% in the case of CaO–SiO 2 –CaCl 2 slag. Based on the study of Park et al [40], Wang et al [39] believed that volatile gas such as SiCl 4 would be generated from the CaCl 2 -containing slags. According to Figure 3 and Figure 6, the volatile compound of CaCl 2 -containing BOF slags is confirmed to be FeCl 2 mainly.…”
The volatilization behaviour of CaCl 2 -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 CaCl 2 -containing slags, and the volatilization ratio was also calculated by the thermodynamic software HSC. It was found that volatilization takes place in both CaCl 2 -containing and CaF 2 -containing BOF slags, but their influential mechanisms are different. FeCl 2 is the main volatile compound in CaCl 2 -containing BOF slags. The increasing contents of CaCl 2 and FeO in these slags are favourable for volatilization, while higher slag basicity plays the opposite role. In the case of CaF 2 -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 CaCl 2 -containing BOF slag.
“…If there is no FeO contained in the slag, a small amount of volatile compounds can still be generated, and the volatilization ratios of the CaF 2 -containing and CaCl 2 -containing slags are very close. Similar results were obtained by Wang et al [39] and Park et al [40] It is noted that in the studies of Wang et al [39] and Park et al [40], the volatilization ratios of CaCl 2 and CaF 2 were calculated according to the composition changes of the slags. In contrast, the total mass change of the CaCl 2 -containing BOF slag system was measured in the present study.…”
Section: Resultssupporting
confidence: 85%
“…Even though, the FeO content was still found to have a significant impact on the volatilization behaviours of the BOF slag. Since almost no FeO was contained in the slags of Wang et al [39] and Park et al [40], the volatilization behaviours of CaCl 2 -containing BOF slag system should be different in this study. Figure 7. Effect of FeO content on measured volatilization ratio.…”
Section: Resultsmentioning
confidence: 97%
“…Park et al [40] proposed that SiF 4 might be the main volatile compound of CaO–SiO 2 –MnO–CaF 2 slag, and the volatilization ratio of this slag was smaller than 15%. Meanwhile, Wang et al [39] pointed out that the volatilization ratio was lower than 15% in the case of CaO–SiO 2 –CaCl 2 slag. Based on the study of Park et al [40], Wang et al [39] believed that volatile gas such as SiCl 4 would be generated from the CaCl 2 -containing slags.…”
Section: Resultsmentioning
confidence: 99%
“…Meanwhile, Wang et al [39] pointed out that the volatilization ratio was lower than 15% in the case of CaO–SiO 2 –CaCl 2 slag. Based on the study of Park et al [40], Wang et al [39] believed that volatile gas such as SiCl 4 would be generated from the CaCl 2 -containing slags. According to Figure 3 and Figure 6, the volatile compound of CaCl 2 -containing BOF slags is confirmed to be FeCl 2 mainly.…”
The volatilization behaviour of CaCl 2 -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 CaCl 2 -containing slags, and the volatilization ratio was also calculated by the thermodynamic software HSC. It was found that volatilization takes place in both CaCl 2 -containing and CaF 2 -containing BOF slags, but their influential mechanisms are different. FeCl 2 is the main volatile compound in CaCl 2 -containing BOF slags. The increasing contents of CaCl 2 and FeO in these slags are favourable for volatilization, while higher slag basicity plays the opposite role. In the case of CaF 2 -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 CaCl 2 -containing BOF slag.
“…Park et al [29] measured the viscosity of CaO–SiO 2 (–MgO)–(≤15 wt-%) CaF 2 slags and the effect of CaF 2 on the viscous flow of molten slags was consequent on a decrease in the degree of polymerization by F − and O 2− ions confirmed by the IR spectra of the quenched slags. The higher content of CaF 2 contributed to lower critical temperature of the slags, and the decrease in the viscosity of slag at a certain high temperature [30,31]. In addition, the CaF 2 in the blast furnace slag mainly exists in the form of 3CaO·CaF 2 ·2SiO 2 (cuspidine) or CaF 2 , the increase of the CaF 2 content will bring about the increase of the content of these two phases in the slag.…”
The interface reaction between carbon composite brick and blast furnace slag was investigated to clarify the formation and evolution mechanism of slag-rich protective layer on the brick's surface in blast furnace. The wettability, microscopic morphology, phase components and thickness of the reaction layer between the original/modified brick and slag with different basicities, MnO, CaF 2 and FeO additions were analyzed respectively. The results revealed that the mechanism of the deposition process of the slag-rich protective layer was relevant to the ash in the brick and coke, and the slag entrained by coke, the wettability between the brick and slag and the oxides such as MnO and FeO in the slag, the precipitated Ti(C,N) from the molten iron, etc.
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