Abstract
Manganese ferrite spinel (MnxFe3-xO4) has been synthesized by multi-step roasting and magnetic separation from ferruginous manganese ore (FeMn ore). In the current work, during the carbothermic reduction process, the reduction behavior of FeMn ore at the high temperature was investigated. Then, the reduced FeMn ore was separated by two-step magnetic separation. The morphologies and properties of the obtained FexMn1-xO products with various x-values by two-step magnetic separation were characterized by XRD and SEM-EDS analysis to further understand the formation mechanism of FexMn1-xO from FeMn ore. In the end, the intermediates were magnetized in an oxidizing roasting step. Based on the experimental results and the thermodynamic calculations, the high temperature (above 950 °C) and long reduction time were conducted to promote the formation of MnxFe3-xO4. The formation mechanism of spinel-type MnxFe3-xO4 was also described in this paper. The morphology and the property evolution of manganese ferrite (MnxFe3-xO4) synthesized by multi-step roasting and magnetic separation were investigated in air atmosphere. The synthesized FexMn3-xO4 product with saturation magnetization was achieved when the intermediates were roasted at 1000 °C for 90 min in air. These findings can provide theoretical support for the reasonable utilization of FeMn ore by multi-step roasting and magnetic separation.
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