Abstract

The sintering pot test was used to investigate the effect of TiO2 on the sintering behavior of chromium-bearing vanadium–titanium magnetite (CVTM) sinter. The main characterization methods of X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy-energy disperse spectroscopy (SEM-EDS), and metallographic microscopy were employed. In this study, yield, tumbler index (TI), vertical sintering speed, productivity, reduction degradation index (RDI), and reduction index (RI) were tested and calculated. The yield first increases from 82.87% to 84.37% and then decreases to 83.65%, vertical sintering speed first increases from 17.00 mm·min−1 to 23.45 mm·min−1 and then decreases to 20.61 mm·min−1, and productivity first increases from 2.33 t·m−2·h−1 to 3.14 t·m−2·h−1 and then decreases to 2.69 t·m−2·h−1 with increasing TiO2 content. The TI increases from 45.81% to 52.09%, and RDI increases from 74.99% to 96.74%, while RI decreases from 67.92% to 47.15% with increasing TiO2 content.

Highlights

  • Chromium-bearing vanadium–titanium magnetite (CVTM) iron ore containing Fe, Ti, Cr, and V is a special and valuable iron ore as known by the exploitation of vanadium–titanium magnetite (VTM), ilmenite, and chromite [1,2]

  • The tumbler index (TI) increases from 45.81% to 52.09%, and reduction degradation index (RDI) increases from 74.99% to 96.74%, while reduction index (RI) decreases from 67.92% to 47.15% with increasing TiO2 content

  • As part of continuing work to study the utilization of CVTM in the blast furnace (BF) process, the effect of TiO2 on sintering behavior of CVTM was explored in this paper

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Summary

Introduction

Chromium-bearing vanadium–titanium magnetite (CVTM) iron ore containing Fe, Ti, Cr, and V is a special and valuable iron ore as known by the exploitation of vanadium–titanium magnetite (VTM), ilmenite, and chromite [1,2]. Similar types of ores are mainly distributed in Russia, Canada, Australia and other places [3,4] As it is known, many studies have been done for the ordinary VTM, while the studies on CVTM with complex phase compositions and different properties are scarce [5,6]. As part of continuing work to study the utilization of CVTM in the BF process, the effect of TiO2 on sintering behavior of CVTM was explored in this paper. The mineral compositions and microstructures of CVTM sinter with different TiO2 contents were studied. These results will provide theoretical and technical bases for the effective production of the CVTM sinter and facilitate its exploitation

Raw Materials and Characterisation Methods
Experiments
Productivity
Reduction Degradation Index
Reduction Index
Chemical Assays and Characterisation
Effect of TiO2 on the Properties of CVTM Sinters
The ICSD numbers phases sinters generate
Microstructure
Particle
Mg42TiO
Theinsilicate phases areBalso in dark grey points
Conclusions
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