论文部分内容阅读
使用同步热分析仪,以10K/min的升温速率对CaF2-SiO2-CaO三元渣系的失重率进行测定,采用非等温热分析方法对渣系挥发反应动力学进行了研究,确定了渣系挥发的反应机理函数f(α),分析了挥发反应机理,并对建立的动力学模型进行验证.结果表明,渣系挥发性与其液相线及物相组成密切相关,而碱度对其影响较小;引起渣系成分改变的挥发过程可分为1373～1573K和1573～1773K两个阶段,前者属三维扩散型机理函数,其微分形式为f(α)=3/2(1-α)4/3[(1-α)-1/3-1]-1,后者属随机成核和随后生长型机理函数,其微分形式为f(α)=1/4(1-α)[-ln(1-α)]-3.70%CaF2-30%SiO2渣系2个阶段的反应活化能分别为550.10和376.16kJ/mol,指前因子1gA分别为16.55和8.4.实验结果与模型计算结果吻合很好.
Using the synchronous thermal analyzer, the weight loss rate of CaF2-SiO2-CaO ternary slag system was measured at a heating rate of 10K / min. The kinetics of volatilization reaction was studied by non-isothermal thermal analysis method. The volatile reaction mechanism function f (α) was analyzed, and the volatilization reaction mechanism was analyzed, and the established kinetic model was validated.The results showed that the volatility of slag system was closely related to its liquidus and phase composition, The former is a three-dimensional diffusion mechanism, the differential form f (α) = 3/2 (1-α ) 4/3 [(1-α) -1 / 3-1] -1, which belongs to the mechanism of random nucleation and growth followed by a derivative of f (α) = 1/4 (1-α) The reaction activation energies of [-ln (1-α)] - 3.70% CaF2-30% SiO2 slag system in two stages were 550.10 and 376.16 kJ / mol respectively, and the pre-exponential factors 1gA were 16.55 and 8.4 respectively. The result is very good.