摘要:
通过对微细粒贫赤铁矿进行非等温动力学研究,考察其反应控速环节,并探究碱金属盐对还原过程的影响,研究结果表明:还原过程由界面反应控制;碱金属盐对还原具有催化作用,降低了反应活化能。碱金属卤盐、碱金属复合盐均具有促进作用,阳离子金属性越强,卤素电负性越小,稳定性越差,高温段表观活化能降低越多,催化性能越好。复合盐稳定性越差,催化效果越强。随催化剂添加量增大,反应速率增大,高温段表观活化能降低,对还原起到促进作用。
Abstract:
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.
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