Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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A Study on the Viscosity of $CaO-SiO_2\;(-MgO)-CaF_2$ Slags

$CaO-SiO_2\;(-MgO)-CaF_2$ 슬래그의 점성에 관한 연구

Park, Joo-Hyun;Song, Hyo-Seok;Min, Dong-Joon
박주현;송효석;민동준

  • Published : 2002.10.23
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Abstract

The viscosity of $CaO-SiO_2(-MgO)-CaF_2$ slags was measured to clarify the effect of $CaF_2$ on the viscous flow of molten slags at high temperatures and the solidification behavior of slags. The theoretical analysis for the relationship between solid fraction and viscosity of slags was also conducted. CaF 2 generally decreases the critical temperature $(T_{CR})$ of slags. The TCR of $CaO-SiO_2-CaF_2(B=1.0)$ slags decreased about 150-200K by addition of 10 mass% MgO. On the other hand, the TCR of the slags with higher basicity (B=1.3) increased about 100 K by MgO addition. The viscosity of $CaO-SiO_2(-MgO)-CaF_2$ slags (B=1.0 and 1.3) decreased with increasing $CaF_2$ content up to 15 mass% at 1823 K. The effect of $CaO/SiO_2$ ratio on slag viscosity was not significant in $CaO-SiO_2-CaF_2$ slags. The effect of $CaF_2$ addition on the viscosity of $CaO-SiO_2-10$ $(mass%)MgO-CaF_2(B=1.0)$ slags was negligible. However, the effect of $CaF_2$ on the viscosity of the slags with higher basicity (B=1.3) was significant. A theoretical calculation indicated that the apparent viscosity of heterogeneous slags (solid/liquid mixture) exponentially decreased with increasing $CaF_2$ content.

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