Abstract
High-chromium vanadium-titanium magnetite (HCVTM) in the Hongge region has been used as an essential mineral resource in ironmaking. The effects of MgO on sintering performance and metallurgical properties were investigated by sintering pot tests, X-ray diffraction (XRD), and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS). HCVTM sinters with varying MgO contents (2.7–3.5%), which was achieved by adding dolomite, were tested for yield, strength, reduction degradation index (RDI), reduction index (RI), and softening-melting properties. The productivity and the comprehensive index were evaluated. The results show that yield and productivity increased, while the vertical sintering speed and the tumbler index (TI) initially increased then decreased with the increase of MgO content. The mineral structure of HCVTM sinter changed from a non-uniform state to a uniform state with increased MgO content. Most of the Mg2+ entered the magnetite lattice, while a small amount entered the perovskite and the calcium silicate. The increase of MgO content improved RDI and softening-melting properties while reducing RI. The best recommended amount of MgO was 3.3% from the comprehensive index.
Highlights
In recent years, a kind of high-chromium vanadium-titanium magnetite (HCVTM) was discovered in Hongge district, Sichuan Province, and the reserve exceeded 3.5 billion tons
High basicity sinter can be used as the main feedstock during ironmaking operation processes, and the valuable elements such as Ti, Cr, and V can be extracted from blast furnace (BF) slag and vanadium slag [6,7,8,9,10]
Gan et al [20] reported that the increased MgO content improved the properties of sinter, and the suitable MgO content was less than 3.7% in titaniferous magnetite sinter
Summary
A kind of high-chromium vanadium-titanium magnetite (HCVTM) was discovered in Hongge district, Sichuan Province, and the reserve exceeded 3.5 billion tons. HCVTM has a high content of valuable elements, which shows a comprehensive utilization value. Due to the insufficient supply of pellets and massive high-grade minerals in China, the reserves of vanadium-titanium magnetite in the southwestern region are enough, and it is necessary and meaningful to conduct comprehensive utilization research on HCVTM sintered ore [4,5]. Gan et al [20] reported that the increased MgO content improved the properties of sinter, and the suitable MgO content was less than 3.7% in titaniferous magnetite sinter. The sintering performance and the metallurgy property of HCVTM sinter were investigated with the increase of MgO content, and the mechanism of MgO influencing mineral compositions and sinter quality was revealed
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