Study on Catalytic Reduction Kinetics of Micro-fine Lean Hematite by Thermal Analysis Method

The non-isothermal kinetics study is implemented on micro fine lean hematite to investigate the rate-determining system of chemical reaction and the effect of alkali salt on the reduction process.The results show that the reduction process is decided by the interface reaction and catalyzed by alkali salt which lowers the reaction of activation energy.Both alkali-metal salt and compound alkali metal salt have the capability to accelerate the reduction process.The stronger the metallicity of cationic is,the weaker the electronegativity and the stability of halogen will be.Besides,the activation energy will abate more at high temperature and the catalyst will perform better.If the stability of compound salt lessens,the catalytic effect will be stronger.Therefore,as addition of the catalyst increases,the reaction rate will increase and the activation energy at high temperature will decrease,which will promote the reduction process.