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Viscous behaviour of CaO-SiO 2-Al 2 O 3-MgO-FeO slag
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lee, Yo Seob Kim, Jong Ryeol |
| Copyright Year | 2004 |
| Abstract | 225 Introduction Viscous behaviour of blast furnace (BF) slags plays an important role that affects operation efficiency since the flow pattern of molten slags has a significant influence on gas permeability, heat transfer, and the reduction of SiO2 and FeO. Since the reduction of iron ores and the formation of slags with coke/coal ash proceed in the BF, basicity (CaO/SiO2) and FeO content in slags continuously change from the composition of initial sintered ore. Because the slags do not fully assimilate with ash in the bosh region of the blast furnace, they exhibit relatively high CaO/SiO2 (C/S) ratios of about C/S=1.4–1.6 and 5–20 percent FeO,1,2 which is compared with C/S 1.2 and FeO ≤ 0.2 mass% in tapped blast furnace slags.3 A relatively high basicity of slag in the bosh region is one of the main causes of slag formation problems.4 Although the viscosities of CaO-SiO2-Al2O3(-MgO) slags have been measured by several researchers5-7, the range of basicity in these studies was limited to approximately C/S 0.6–1.3 in view of tapped slag composition. Recently, the viscosities of the CaO-SiO2-Al2O3-MgO-FeO slags with C/S=1.2–1.5 were measured by Sugiyama.2 However, the viscosities of slags containing FeO were measured only at CaO/SiO2=1.2, and these results were applied to other basicity regions by extrapolation. Therefore, in the present study, the viscosities of CaOSiO2-Al2O3-MgO-FeO slags were measured to understand the viscous behaviour of slag in BF under conditions of C/S=1.15–1.6, 10–13 percent Al2O3, 5–10 percent MgO and 5–20 percent FeO. In addition, the thermodynamic approach based on experimental results was carried out in order to obtain the relationship between viscosity and slag components. Experimental The rotating cylindrical method was employed for viscosity measurement. The experimental apparatus is shown in Figure 1. A Brookfield digital viscometer (model LVDVII+, Middleboro, MA) was used in the present study. The LEE, Y.S., KIM, J.R., YI, S.H. and MIN, D.J. Viscous behaviour of CaO-SiO2-Al2O3-MgO-FeO slag. VII International Conference on Molten Slags Fluxes and Salts, The South African Institute of Mining and Metallurgy, 2004. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.saimm.co.za/Conferences/Slags2004/033_LEE.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
