Kinetics and reduction mechanism of high-basicity electric arc furnace dust by carbothermal reduction
In order to investigate the kinetics and reduction mechanism of carbothermal reduction reaction of high-basicity electric arc furnace dust(EAFD),the phase transition process of carbon containing high-basicity EAFD via XRD under different temperatures was analyzed.The high-basicity EAFD with different carbon contents and basicities were analyzed by the thermogravimetric analysis method.The results show that the carbon content and basicity can promote the carbothermal reduction reaction of EAFD,and increasing basicity can reduce the temperature required for the reaction.Finally,the kinetics of high-basicity EAFD was analyzed by a non-isothermal kinetic analysis method.Based on the KAS method and Coats-Redfern methods,the kinetic parameters and mechanism function were determined.The carbothermal reduction process of high-basicity EAFD was divided into three stages on the basis of the conversion rate(α):α=0-0.082,α=0.082-0.5,and α=0.5-1.0.The average activation energy of the first stage was 380.68 kJ/mol,and the reaction mechanism was one-dimensional diffusion.The average activation energy was 318.79 kJ/mol for the second stage and 264.42 kJ/mol for the third stage.The chemical reaction function was discovered as the most suitable mechanism in the second and third stage.
electric arc furnace dustcarbothermal reductionbasicitynon-isothermal kinetics
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