Abstract
Adding MgO to sinter is considered to be a popular counter measure to cope with the use of high Al2O3 ores. The purpose of this paper is to investigate the effect of the MgO content on the reduction melting behavior in order to clarify the main mechanism of melting and dripping under simulated blast furnace (BF) conditions. It was found that reduction behavior was inhibited with an increased MgO content; the reduction mechanism was further investigated by means of XRD, SEM, and kinetic analysis. The influence of MgO on the melting mechanism of high basicity sinter was also studied. The softening start temperature and softening temperature increased, and the softening zone increased as a whole with the increased MgO contents from 1.3 to 2.0 wt%. The melting temperature was similar, because the MgO remained in an unslagged state and existed in wustite as FeO-MgO solid solution. The dripping temperature was increased; the main reason for this was that high melting-point slags appeared, and that it was more difficult for carburization to occur with increased MgO content. The most appropriate MgO content in the sinter was 1.3 wt% according to principal component analysis (PCA).
Highlights
In recent years, Al2 O3 in slag has been improved with an increased imported ore, which is an enormous challenge for blast furnace [1]
The most appropriate MgO content in the sinter was 1.3 wt% according to principal component analysis (PCA)
The results provide a theoretical foundation and experimental reference for the effects of MgO on reduction-melting of high basicity sinter in blast furnace (BF)
Summary
Al2 O3 in slag has been improved with an increased imported ore, which is an enormous challenge for blast furnace [1]. To cope with the use of high Al2 O3 ores, adding MgO to sinter is considered to be a popular counter measure. The purpose of adding MgO is mainly to guarantee appropriate basicity, increase viscosity, and improve the ability of slag to desulfurization, whereas there is a negative influence for ironmaking, such as iron ore strength, reduction, and melting-dripping properties. Softening-melting, an important characteristics, can influence the ironmaking process, and the burden of better softening-melting increases the permeability index and ensures smooth operation of blast furnace; production efficiency is improved and economic benefits are generated.
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