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研究一水铝石(包括一水软铝石和一水硬铝石)在氢氧化钠溶液中溶出过程的机理函数并确定相应的动力学参数。将一水铝石矿和氢氧化钠溶液在高压DSC设备中以10℃/min的速度加热,用微分方程法分析得到DSC曲线,同时借助Matlab程序利用迭代法和线性最小二乘法计算微分方程,从30种机理函数的微分形式中分别逻辑地选择了两种一水铝石矿和苛性碱溶液的反应过程的最可能的机理函数。计算结果表明:一水软铝石溶解于苛性碱溶液的最可能的机理函数为f(α)=1-α,表观活化能为79.178kJ/mol,指前因子为1.031×108mol/s,反应级数为1;一水硬铝石在苛性碱溶液中溶解的最可能的机理函数为f(α)=2(1-α)3/2,表观活化能为73.858kJ/mol,指前因子为5.752×107mol/s,反应级数为1.5。
The mechanism of digestion of diaspore (including boehmite and diaspore) in sodium hydroxide solution was studied and the corresponding kinetic parameters were determined. The diaspore and sodium hydroxide solution were heated in a high-pressure DSC apparatus at a rate of 10 ° C / min, and the DSC curve was obtained by using the differential equation method. At the same time, differential equations were calculated by iterative method and linear least square method with Matlab program, The most probable mechanism functions of the reaction processes of two kinds of diaspore and caustic solution were logically selected from the differential forms of 30 kinds of mechanism functions respectively. The calculated results show that the most possible mechanism function for the dissolution of boehmite in caustic solution is f (α) = 1-α, the apparent activation energy is 79.178kJ / mol, the pre-exponential factor is 1.031 × 108mol / s, The reaction order is 1. The most possible mechanism of dissolution of diaspore in caustic solution is f (α) = 2 (1-α) 3/2, and the apparent activation energy is 73.858 kJ / mol, which means The former factor is 5.752 × 107mol / s, the reaction order is 1.5.