TY - JOUR
T1 - Effect of microwave heating on the microstructures and kinetics of carbothermal reduction of pyrolusite ore
AU - Ye, Qianxu
AU - Chen, Jin
AU - Chen, Guo
AU - Peng, Jinhui
AU - Srinivasakannan, C.
AU - Ruan, Rongsheng
PY - 2018/8
Y1 - 2018/8
N2 - This article focuses on the development of phase transformation and morphology of low-grade pyrolusite during carbothermal reduction using microwave heating. The XRD, SEM and EDS results show that selective carbothermal reduction of MnxOy and FexOy in pyrolusite is easy to realize with microwave heating, which can reduce MnO2 to MnO, and Fe2O3 to Fe3O4, rather than FeO. It was also observed that the phases of Mn2O3, Mn3O4 and MnO appear at 300 °C, 450 °C and 500 °C, respectively. The MnO phase, formed by the accumulation of MnO sphere particle with a diameter of 266.75–420.05 nm, is loose and porous. At a temperature of 750 °C, the Mn2SiO4 layer of about 316 nm in thickness, tightly wrapping SiO2 particle is generated at the interface between MnO and SiO2 embedded with MnO. Above 650 °C, Fe2O3 in pyrolusite can be transformed into a very dense Fe3O4 phase.
AB - This article focuses on the development of phase transformation and morphology of low-grade pyrolusite during carbothermal reduction using microwave heating. The XRD, SEM and EDS results show that selective carbothermal reduction of MnxOy and FexOy in pyrolusite is easy to realize with microwave heating, which can reduce MnO2 to MnO, and Fe2O3 to Fe3O4, rather than FeO. It was also observed that the phases of Mn2O3, Mn3O4 and MnO appear at 300 °C, 450 °C and 500 °C, respectively. The MnO phase, formed by the accumulation of MnO sphere particle with a diameter of 266.75–420.05 nm, is loose and porous. At a temperature of 750 °C, the Mn2SiO4 layer of about 316 nm in thickness, tightly wrapping SiO2 particle is generated at the interface between MnO and SiO2 embedded with MnO. Above 650 °C, Fe2O3 in pyrolusite can be transformed into a very dense Fe3O4 phase.
KW - Carbothermal reduction
KW - Microwave heating
KW - Phase transformation
KW - Pyrolusite
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U2 - 10.1016/j.apt.2018.04.025
DO - 10.1016/j.apt.2018.04.025
M3 - Article
AN - SCOPUS:85046793745
VL - 29
SP - 1871
EP - 1878
JO - Advanced Powder Technology
JF - Advanced Powder Technology
SN - 0921-8831
IS - 8
ER -