高镁贫镍红土矿碳还原动力学  

The kinetics of cabon reduction of high magnesium low nickel laterite ore

作　　者：彭博 王宇鲲 魏永刚[1,2] PENG Bo;WANG Yu-kun;WEI Yong-gang(State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming University of Science and Technology,Kunming 650093,China;Faculty of Metallurgy and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学省部共建复杂有色金属资源清洁利用国家重点实验室,昆明650093 [2]昆明理工大学冶金与能源工程学院,昆明650093

出　　处：《矿冶》2021年第1期46-51,共6页Mining And Metallurgy

基　　金：国家自然科学基金资助项目(U1302274,51304091)。

摘　　要：首先由多重升温速率热重实验获得样品质量随温度的变化关系,并计算出碳热还原反应转化率及反应速率,随后采用热分析动力学微分法(Kissinger)和积分法(Flynn-Wall-Ozawa)分析还原过程动力学参数,最终明确了高镁贫镍红土矿碳还原过程反应动力学特征。结果表明,碳热反应过程分为两步:第一步在500~800℃,对应金属氧化物与固相还原剂的反应,生成磁性铁、镍和CO,对应反应表观活化能为260.4kJ/mol;第二步在为800℃至反应结束,主要是CO与磁性铁反应生成FeO,FeO、NiO与CO反应生成镍铁合金,以及CO2和C发生布多尔反应生成CO,对应活化能为191.2kJ/mol。由此证实了高镁贫镍红土矿碳热还原多步反应的动力学特征。First,the relationship between sample mass and temperature was obtained by multiple heating rate thermogravimetric experiment,the conversion rate and reaction rate of carbothermal reduction reaction were calculated.Then the kinetic parameters of the reduction process were calculated by Kissinger method and Flynn-Wall-Ozawa(FWO)method,and the kinetics characteristics of carbon reduction process of high magnesium low nickel laterite ore were determined.The analysis shows that the reaction process is divided into two steps:the first step is the reaction of corresponding metal oxide with solid reducing agent in 500~800℃to produce magnetic iron,nickel and Co,with the apparent activation energy of 260.4 kJ/mol,and the second step is the reaction CO of with magnetic iron from 800℃to the end of the reaction to produce FeO,the reaction of FeO and NiO with CO to produce nickel iron alloy,and the budol reaction of CO2 and C to produce CO,with the corresponding activation energy of 191.2 kJ/mol.The above results have confirmed dynamic characteristics of carbon thermal reduction multi-step reaction of high magnesium and low nickel laterite ore.

关 键 词：热分析动力学 还原 红土镍矿 活化能 

分 类 号：TF815[冶金工程—有色金属冶金]