Abstract
Abstract B 2O 3 is selected as fluxing agent of CaO-based ladle refining slag to decrease the melting temperature as well as to improve the speed of slag forming and the refining efficiency. The effects of B 2O 3 on the melting temperature of two series of refining slags including the low basicity slags (the mass ratio of CaO/SiO 2 is 3 — 4) and the high basicity slags (the mass ratio of CaO/SiO 2 is 5 — 8.75) were investigated. The slag melting temperature was measured using the hemisphere method. The results indicate that the fluxing action of B 2O 3 is better than that of CaF 2 and Al 2O 3. For the CaO-based refining slag with low basicity, the melting temperature is decreased effectively when B 2O 3 is used to substitute for equal mass of CaF 2, Al 2O 3 and SiO 2, respectively. For the CaO-based refining slag with high basicity, when CaF 2 is substituted by B 2O 3, the melting temperature can be decreased remarkably. Especially, when the mass ratios of CaO/Al 2O 3 and CaO/SiO 2 are in the range of 1.1 — 4.0 and 5.25 — 8.0, respectively, the slag melting temperature is lower than 1 300 °C. Therefore, the B 2O 3-containing refining slags with high ratios of CaO/Al 2O 3 and CaO/SiO 2 have ultra low melting temperature.
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