Oxidation of carbon and silicon in Nb-bearing hot metal
XU Zhang-yin1，2， LI Bao-wei2， ZHAO Zeng-wu2
（1. College of Materials Science and Engineering， Inner Mongolia University of Technology， Hohhot 010051，Nei Mongol， China； 2. School of Materials and Metallurgy， Inner Mongolia University of Science and
Technology， Baotou 014010， Nei Mongol， China）
Abstract：In order to investigate the oxidation pattern of the Nb in Nb-bearing hot metal， the oxidizing relation among Si， C and Nb in the hot metal at 1 550 ℃ was studied by the bottom-blown oxygen atmosphere in an intermediate frequency furnace with no slag or CaO-SiO2-Al2O3 slag with basicity of 0.538 or 1.5； equilibrium calculations about Si， C and other elements in the hot metal during blowing process were also carried out using FactSage software with various basicity of slag and without slag at various temperatures. The results show that C is oxidized in preference to Si in hot metal with the relatively low basicity slag at high temperature while Si is oxidized in preference to C with the high basicity slag at low temperature. The transition temperature of Si and C oxidization is 1 490 ℃. At blowing end in experiments， Nb couldn't be oxidized in the hot metal until the mass percent of Si decreases to 0.138% with the slag of basicity of 1.5. Moreover，the mass percent of Nb doesn't change when the mass percent of Si increases to 0.56% and the mass percent of C decreases to 0.61% in the case of the slag basicity of 0.538. The Nb-contained hot metal can be made to Nb-steel with low basicity slag at a high blowing temperature.
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2019, Vol. 54 
