Effects of reductant type on coal-based direct reduction of iron ore tailings

Effects of reductant type on coal-based direct reduction of iron ore tailings

Wei Wang Pengfei Ye Xiaoli Zhou Changlong Wang Zekun Huo Kaifan Zhang Xiuqing Meng 

Logistics Department, Hebei University of Engineering, Handan 056038, China

School of Civil Engineering, Hebei University of Engineering, Handan 056038, China

Jiangxi Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China

Tianjin Sunenergy Sega Environmental Science & Technology Co. Ltd., Tianjin 300380, China

Beijing Carbon Fibre Engineering Technology Research Centre, Beijing Bluestar Cleaning Co. Ltd, Beijing 101318, China

Corresponding Author Email: 
baistuwong@139.com
Page: 
453-466
|
DOI: 
https://doi.org/10.3166/ACSM.42.453-466
Received: 
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Accepted: 
|
Published: 
30 September 2018
| Citation

OPEN ACCESS

Abstract: 

This paper explores the effects of reductant type, flux, reduction temperature, and reduction time on coal-based direct reduction of iron ore tailings. A series of tests were designed and implemented on ore tailing samples containing 14.51% of iron. The results show that the most ideal coal reductant for the direct reduction of iron ore tailings should be rich in fixed carbon and poor in volatile matters; with anthracite as reductant and CaO as flux, the tailing samples roasted and magnetically separated for 180min at 1,300 oC yielded high iron content (90.12%) and iron recovery rate (72.21%). Then, the components of the product was analysed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). According to the XRD, SEM and EDX spectra, the product consists of lots of metallic irons and a few α-cristobalite and magnetite. The metallic irons were obtained through direct reduction, while the α-cristobalite and magnetite came from the secondary oxidization of metallic iron. The research findings shed new light on the reduction and recovery of iron in iron ore tailings

Keywords: 

iron ore tailings, coal-based direct reduction, reductant type, roasting

1. Introduction
2. Materials and Methods
3. Results and discussion
4. Conclusions
Acknowledgment

This paper is made possible thanks to the generous support from China Postdoctoral Science Foundation (Grant No.: 2016M602082), Natural Science Foundation of Hebei Province (Grant No.: E2018402119), Science and Technology Research Project of Higher Education Universities in Hebei Province (Grant No.: ZD2016014; QN2016115), Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources (Grant No.:  2017SKY-WK008), Handan Science and Technology Research and Development Plan Program (Grant No.: 1621211040-3), Jiangxi Postdoctoral Daily Fund Project (Grant No.: 2016RC30) and Jiangxi Postdoctoral Research Project (Grant No.: 2017KY19)

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