Utilization of Waste Straw Biomass in Suspension Magnetization Roasting of Refractory Iron Ore: Iron Recovery, Gas Analysis and Roasted Product Characterization

Yue Cao, Yongsheng Sun (), Peng Gao and Wenbo Li
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Yue Cao: School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
Yongsheng Sun: School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
Peng Gao: School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
Wenbo Li: School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China

Sustainability, 2023, vol. 15, issue 22, 1-18

Abstract: The straw-type biomass, as a green and alternative reductant for the suspension magnetization roasting (SMR) of iron ores, is proposed. The roasted products are investigated at a roasting temperature of 750 °C, the roasting time of 7.5 min and the biomass dose of 25%. The iron phase results indicate that hematite ores were reduced to magnetite by the biomass, and the magnetization transformation increased from 0.64 A·m 2 ·g −1 to 36.93 A·m 2 ·g −1 . The iron ore microstructure evolutions of holes and fissures are detected by SEM-EDS. The biomass pyrolyzed to form CO 2 , CO, CH 4 , H 2 O, H 2 , C=O, benzene skeleton, C-Hand C-O compounds at 200–450 °C, while the mass loss of the magnetization roasting process occurred at 450–750 °C by using TG-FTIR. The GC/MS results showed that the organic gases preferred to produce the O-heterocycles at 329 °C while the hydrocarbons were dominant at the high temperature of 820 °C for the hematite ore and biomass mixture. The gas composition analysis explained that the reducing gaseous products (CO, CH 4 and H 2 ) were used as a reductant and consumed obviously by hematite ore in the SMR process. The innovative utilization of biomass waste was effective for iron recovery of hematite ore and contributes to the reduction of greenhouse gases and the protection of the environment.

Keywords: suspension magnetization roasting; biomass pyrolysis; gases evolution rules; phase transformation; microstructure evolution (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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