论文部分内容阅读
采用非等温热分析法对红土镍矿固相还原动力学进行了研究,由热失重曲线确定了红土镍矿固相还原的反应机理函数f(a),在此基础上求解出动力学参数,并对建立的动力学模型进行了验证,分析了红土镍矿固相还原机理.结果表明,红土镍矿失重率与加热温度密切相关,而升温速率对其影响很小;模型计算值与实测值具有良好的相关性;固相还原过程可分为473～773和773～1223K两个阶段,反应活化能分别为171.91和52.75kJ/mol,与挥发分的析出和镍、铁氧化物的还原对应;反应属随机成核和随后生长型机理函数,其微分形式为f(a)=1/4(1-a)[-ln(1-a)]-3,反应速率主要由碳气化反应控制.
The kinetics of solid-phase reduction of laterite nickel ore was studied by using non-isothermal thermal analysis method. The reaction mechanism function f (a) of solid-phase reduction of lateritic nickel ore was determined from the thermogravimetric curve. On this basis, kinetic parameters were solved, The kinetic model was established and the mechanism of solid phase reduction was analyzed.The results show that the weight loss rate of lateritic nickel ore is closely related to the heating temperature and the heating rate has little effect on it.The calculated values and measured values The solid state reduction process can be divided into two stages of 473-773 and 773-1223K, the activation energies of reaction are 171.91 and 52.75kJ / mol, respectively, which are related to the precipitation of volatiles and the reduction of nickel and iron oxides (1-a) [- ln (1-a)] - 3, the reaction rate is mainly composed of carbon gasification reaction control.