Solid-phase decarburization of high-carbon ferromanganese powders(HCFPs)was conducted using calcium carbonate powders(CCPs)as a decarburizer by microwave heating.Solid-phase decarburization kinetics was investigated by isothermal method.The results show that the HCFPs show excellent microwave absorption at a higher average heating rate of 80 ℃/min,while CCPs exhibit poor microwave absorption at a lower heating rate of 5-20℃/min;the heating characteristics are in-between when HCFPs and CCPs are mixed.The average heating rates of the mixture are 32.14,31.25,31.43,and 30.77 ℃/min when the mixture is heated up to 900,1 000,1 100,and 1 200℃,respectively.The good microwave absorption property of the mixed material lays the foundation for the solidphase decarburization of HCFPs containing CCPs.Solid-phase decarburization of HCFPs containing CCPs is a firstorder reaction by microwave heating.Apparent activation energy of solid-phase decarburization is 55.07kJ/mol,which is far less than that of ordinary carbon gasification reaction and that of solid-phase decarburization under the same decarburization condition by conventional heating.It indicates that microwave heating not only produces thermal effect,but also has non-thermal effect. Solid-phase decarburization of high-carbon ferromanganese powders (HCFPs) was conducted using calcium carbonate powders (CCPs) as a decarburizer by microwave heating. Solid-phase decarburization kinetics was investigated by isothermal method. The results show that the HCFPs show excellent microwave absorption at a higher average heating rate of 80 ° C / min, while CCPs exhibit poor microwave absorption at a lower heating rate of 5-20 ° C / min; the heating characteristics are in-between when HCFPs and CCPs are mixed. average heating rates of the mixtures are 32.14, 31.25, 31.43, and 30.77 ° C / min when the mixture is heated up to 900,1 000,1 100, and 1 200 ° C, respectively. The good microwave absorption property of the mixed material lays the foundation for the solidphase decarburization of HCFPs containing CCPs. Solid-phase decarburization of HCFPs containing CCPs is a first order reaction by microwave heating. Apparent activation energy of solid-phase decarburization is 55.07 kJ / mol, which is far less than than that of ordinary carbon gasification reaction and that of solid-phase decarburization under the same decarburization condition by conventional heating .It indicates that microwave heating not only produces a thermal effect, but also has a non-thermal effect.