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Minerals 2017, 7(11), 220; doi:10.3390/min7110220

Preparation of Direct Reduced Iron and Titanium Nitride from Panzhihua Titanomagnetite Concentrate Through Carbothermic Reduction-Magnetic Separation

1
Faculty of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2
School of Architectural and Surveying and Mapping Engineering, Jiangxi University of Science and Technology; Ganzhou 341000, China
*
Author to whom correspondence should be addressed.
Received: 30 August 2017 / Revised: 31 October 2017 / Accepted: 6 November 2017 / Published: 10 November 2017
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Abstract

A novel process for preparing direct reduction iron (DRI) and titanium nitride (TiN) from Panzhihua titanomagnetite concentrate is proposed. This process involves pelletizing, direct reduction roasting and magnetic separation. The effects of reduction temperature, coal dosage and reduction time on the phase transformation of composite pellets were investigated by X-ray diffraction. Results show that TiN formation proceeds less easily than metallic iron formation. Increasing the reduction temperature, reduction time and coal dosage can promote the transformation of titanium to TiN. Titanium was almost completely transformed into TiN under the conditions of 1300 °C reduction temperature, 26 wt % coal dosage and 90 min reduction time. The scanning electron microscopy (SEM) analysis showed that near-spherical metallic iron particles with diameters from dozens of microns to about 300 μm were formed in the reduced pellets, whereas the TiN particles generally measured less than 10 μm. The energy dispersive spectroscopy (EDS) results revealed that the TiN phase contains a certain amount of vanadium and carbon, and traces of other impurities. The reduced composite pellets under the optimum conditions were processed by grinding and subsequent magnetic separation. As a result, a DRI with 92.88 wt % Fe, 1.00 wt % Ti, and 0.13 wt % V was obtained, and the recoveries of Fe, Ti, and V were 92.85 wt %, 9.00 wt %, and 19.40 wt %, respectively. 91.00 wt % Ti and 80.60 wt % V were concentrated in the rough TiN concentrate. View Full-Text
Keywords: titanomagnetite; carbothermic reduction; magnetic separation; direct reduction iron; titanium nitride titanomagnetite; carbothermic reduction; magnetic separation; direct reduction iron; titanium nitride
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MDPI and ACS Style

Yu, W.; Wen, X.; Chen, J.; Kuang, J.; Tang, Q.; Tian, Y.; Fu, J.; Huang, W.; Qiu, T. Preparation of Direct Reduced Iron and Titanium Nitride from Panzhihua Titanomagnetite Concentrate Through Carbothermic Reduction-Magnetic Separation. Minerals 2017, 7, 220.

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