Investigations of MgO on Sintering Performance and Metallurgical Property of High-Chromium Vanadium-Titanium Magnetite

• Published in: Minerals (Basel) Vol. 9; no. 5; p. 324
• Main Authors: Zhang, Liheng, Yang, Songtao, Tang, Weidong, Xue, Xiangxin
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.05.2019
• Subjects: Aluminum oxide; Bearing materials; Calcium; Calcium ferrites; Chemical properties; Chemicophysical properties; Chromium; Fracture toughness; Garnet; Glass; high-chromium vanadium-titanium magnetite; Iron compounds; Laboratories; Magnesium oxide; Magnetic properties; Magnetite; metallurgical property; Metallurgy; MgO; Microstructure; Mineralogy; Minerals; Organic chemistry; Permeability; Productivity; Raw materials; Silicates; Silicon; Sintering; sintering performance; sintering pot test; Steel industry; Temperature; Titanium; Titanium dioxide; Vanadium; China
• ISSN: 2075-163X; 2075-163X
• DOI: 10.3390/min9050324

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.