Exploration of hydrogen-based suspension magnetization roasting for refractory iron ore towards a carbon-neutral future: A pilot-scale study. (19th April 2022)

• Record Type: Journal Article
• Authors: Tang, Zhidong; Xiao, Hanxin; Sun, Yongsheng; Gao, Peng; Zhang, Yahui
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 33(2022)
• Page Start: 15074
• Page End: 15083
• Publication Date: 2022-04-19
• Subjects: Refractory iron ore -- Hydrogen-based suspension magnetization roasting -- Clean reducing agent -- Phase transformation -- Magnetic separation; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.02.219
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In the iron and steel industry, magnetization roasting technology is one of the effective methods to realize the efficient development and utilization of refractory iron ores, but global warming requires us to reduce greenhouse gas emissions. Therefore, switching to the clean reducing agent for the magnetization roasting of iron ores is of significance. In this study, hydrogen was used as reductant for the pilot-scale study of suspension magnetization roasting of a refractory iron ore, and the roasted products were processed with magnetic separation. The results showed that the continuous stability experiments obtained a magnetic separation concentrate with an average iron grade of 65.68% and an average iron recovery of 91.64% under the optimal roasting conditions of temperature 470 °C, hydrogen concentration 22%, feeding rate 140 kg/h and total gas flow rate 18 m 3 /h. The phase composition and changes of the ore during roasting, as well as the magnetic characteristics, were analyzed by X-ray diffraction, Mössbauer spectroscopy, and vibrating sample magnetometer, respectively. Besides, the microscopic morphology and micro-area element content of the ore were observed by a field emission scanning electron microscope equipped with an EDS unit. This study provides a reference for the efficient and clean utilization of refractory iron ores towards a carbon-neutral future. Highlights: H2 was used as reducing agent in magnetization roasting of refractory iron ore. HSMR pilot-sale test of refractory iron ore was successfully carried out. Iron minerals were separated efficiently by HSMR process from refractory iron ore. The cracks produced during roasting process of ore promoted the reduction reaction. Iron concentrate with Fe grade of 65.68% and Fe recovery of 91.64% was obtained.