(1. 青島農(nóng)業(yè)大學 化學與藥學院，青島 266109； 2. 中國科學院 過程工程研究所，北京 100080)
摘 要: 對鋁酸鉀溶液碳酸化分解過程進行研究，建立碳酸化分解過程的動力學模型。借鑒拜耳法晶種分解的動力學模型，對碳分動力學數(shù)據(jù)進行多元回歸，得到動力學方程。結(jié)果表明：碳酸化分解的表觀活化能為39.2708 kJ/mol，說明鋁酸鉀溶液碳酸化分解需要突破的壁壘小；瞬時晶種量對碳酸化分解過程的影響較小；相比鋁酸鈉溶液碳酸化分解，苛堿濃度對鋁酸鉀溶液分解的影響更大。鋁酸鉀溶液在40~80℃碳化分解，所得氫氧化鋁為拜耳石型。
關(guān)鍵字: 鋁酸鉀溶液；碳酸化分解；動力學模型；多元線性回歸；表觀活化能
（1. College of Chemistry and Pharmacy, Qingdao Agricultural University, Qingdao 266109, China; 2. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China）
Abstract:The kinetics of carbonation decomposition of potassium aluminate solution was investigated and the kinetic model was established. Referencing seeded precipitation model, the kinetic equation was deduced through multiple linear regression according to experimental data. The equation shows that the apparent activation energy is 39.2708 kJ/mol, demonstrating that the carbonation decomposition reaction of potassium aluminate solution is easier than that of sodium aluminate solution. The instantaneous seed quantity has a small effect on the process of carbonation decomposition; the alkali concentration has more significant impact on the carbonation decomposition of potassium aluminate solution than that of sodium aluminate solution. XRD analysis demonstrates that the obtained products at 40-80 ℃ belong to Gibbsite Al(OH)3.
Key words: potassium aluminate solution; carbonation decomposition; kinetic model; multiple linear regression; apparent activation energy
