Study on the High-Temperature Sintering Characteristics and Sintering Mechanism of Sea Sand Vanadium Titanomagnetite Based on Micro-sintering

Abstract

The sea sand vanadium titanomagnetite has the problems of coarse particles, difficult agglomeration, and poor sintering performance. It is difficult for iron and steel enterprises to use it as an ironmaking raw material in large quantities. In this work, different methods were adopted to optimize the high-temperature sintering characteristics of sea sand vanadium titanomagnetite to increase the usage of sea sand ore. Based on the characterization and analysis of the basic physical and chemical properties of sea sand ore, the effects of adding limestone, ludwigite, and fine powder on the high-temperature sintering characteristics of sea sand ore were discussed. The proportion of sea sand ore was varied and its effect on the high-temperature sintering characteristics was studied. The phase composition and microstructure of sintered blocks with sea sand ore were analyzed by XRD and SEM–EDS, and the high-temperature sintering mechanism was studied. The results show that the high-temperature sintering characteristics of sea sand ore can be optimized to a certain extent by adding limestone, ludwigite, and fine powder. It is suggested that 15–35 wt% of sea sand ore was appropriate. The experimental results provided some reference methods for iron and steel enterprises to improve the utilization rate of sea sand ore in the actual sintering process.