Non-isothermal Reduction Kinetics of Carbon Coated Iron Powder

Iron-carbon solid-solid reduction reaction has always been a challenge for researcher,therefore,studying the solid-solid reaction kinetics has important practical significance.The mechanical grinding method was used to coat the magnetite with carbon and the differential thermal analysis was conducted on the ore powders with the milling time of 15 s,45 s,75 s and 105 s at a heating rate of 10 K/min.The mineral powder with the milling time of 105 s was selected to study the change rule of weight loss of coated ore powder under the condition of heating rate of 5 K/min,10 K/min,15 K/min and 20 K/min.The FWO method and the Coats-Redfern method were used to analyze the experimental data to get the related kinetic parameters of carbon-coated slag.The experimental results show that the weight loss of carbon coated slag is proportional to the temperature and grinding time within a certain range.The initial activation energy of solidification reaction of carbonaceous coated iron ore powder is 337 kJ/mol,the reaction model is three-dimensional diffusion model,the reaction model function is.