Abstract
High-quality oxidized pellets are the basis to achieve high-efficiency utilization of vanadium–titanium magnetite (VTM) ores. Bentonite was used as a binder of VTM. The main phase composition of VTM is titanomagnetite and ilmenite. When the amount of bentonite is 1%, the compressive strength and dropping strength of VTM pellets can meet the requirements. To improve metallurgical properties, the pellets need to be roasted. The best conditions for roasting are as follows: calcination temperature of 1523 K and a calcination time of 20 min. The consolidation mechanism, phase transformation, and crystal structure transformation of VTM in the process of oxidation roasting are also explained.
Highlights
Vanadium (V), titanium (Ti), and iron (Fe) are important metal elements recognized worldwide
Fe in Vanadium-titanium magnetite (VTM) is mainly found in TTM and a small part exists in ilmenite
No independent mineral of vanadium is found in VTM
Summary
Vanadium (V), titanium (Ti), and iron (Fe) are important metal elements recognized worldwide. There are many direct reduction ironmaking processes in the world, but the gas-based shaft furnace direct reduction ironmaking process is dominant in direct reduction iron production due to its high productivity, low energy consumption, low carbon content, and environmental protection. As the primary charging form for BF, sintering plays an important role in the gas-based shaft furnace direct reduction ironmaking process. The phase composition of VTM is very complex, whereby iron, vanadium, and titanium closely co-exist in a stable structure, so their reduction is more difficult. To solve this problem, scholars have proposed a method of oxidation sintering of VTM to improve its reduction performance and mechanical properties.
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