Abstract: In order to study themagnetization reaction of FeO in the thermal decomposition process of siderite， and provide theoretical guidance for the optimization of the magnetron roasting process of siderite， the kinetics of FeO magnetization in the thermal decomposition of siderite was studied by gas composition analysis system. The results showed that With the increase of reaction temperature, the time to realize same reaction fraction become shorter, and the magnetization reaction rate increase with temperature increases. Under different magnetization reaction temperatures， the reaction fraction showed a similar law with time； the magnetization reaction rate changed the same with the reaction fraction. At the same time， the model data was analyzed by model matching method indicated kinetics of FeO magnetization reaction was in accordance with the kinetic model equation: G（α）=[-ln(1-α)][12]， and the magnetization of the reaction kinetics FeO activation energy was 56.01 kJ/mol， A was 6.07 s-1. The limiting part of FeO magnetization reaction process in the thermal decomposition process of siderite is gas diffusion and interface reaction control.

Key words: Siderite, FeO, Magnetization Reaction, Kinetics, Limiting link