Formation Mechanism and Distribution of Al and O in the Ferrotitanium with Different Ti Contents Prepared by Thermite Method
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Ferrotitanium is used as a deoxidizer, a degassing agent and an alloying element additive in the steel industry. The thermite method, as a way of preparing ferrotitanium, has the advantages of abundant raw material resources, low energy consumption, and low production costs. However, Al and O impurities in ferrotitanium prepared by this method change greatly with its Ti content. The distribution of Al and O residuals and their relationship with the Ti content of the ferrotitanium prepared by the thermite method were studied. The results show that Al and O residuals in the ferrotitanium prepared by the thermite method are mainly caused by intermetallic compounds and Al2O3 inclusion. The Al and O residuals are the quadric function of the Ti content in the alloy prepared by thermite reduction. With increasing Ti content in the ferrotitanium, the amount of intermetallic compounds and Al2O3 inclusions both increase. When the Ti content in the alloy is lower than about 30%, the Al residual in the ferrotitanium prepared by the thermite method is mainly caused by Fe-Al intermetallic compounds, while the O residual is mainly caused by the Al2O3 inclusion. When the Ti content in the alloy is higher than about 30%, the Al residual in the ferrotitanium prepared by the thermite method is caused by Ti-Al intermetallic compounds and Al2O3 inclusion, while the O residual is mainly caused by a great number of Al2O3 inclusions and sub-oxides, such as Ti4Fe2O.
This research was supported by the National Natural Science Foundation of China [51422403, 51504064], Fundamental Research Funds for the Central Universities [N162505002] and the National Basic Research Program of China [973 Program, No. 2013CB632606].
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