Effect of Seed Size on the Kinetics of Decomposition and Crystallization Reaction in Supersaturated Sodium Aluminate Solution
Al(OH)3 was introduced in the supersaturated sodium aluminate solution as the decomposition crystallization reaction seed.The influence of seed sizes on the apparent activation energy in the Arrhenius formula during the reaction process was investigated.The results demonstrated that the apparent activation energy decreases and the decomposition rate increases with the decrease of seed size.The morphology of the seed particles is assumed as ellipsoid.Based on this assumption,the apparent activation energy in the Arrhenius formula is modified by the specific surface energy calculated by ellipsoidal surface.The results showed a linear relationship between the apparent activation energy and the reciprocal of the seed size.It indicates that the decomposition rate increasing with the seed size decreasing is due to the introduction of additional specific surface energy.The specific surface energy reduces the apparent activation energy of the decomposition reaction process of sodium aluminate solution.Furthermore,the quantitative relationship between the seed sizes and the reaction decomposition rate was established,which provides a theoretical basis for the optimal control of the decomposition of supersaturated sodium aluminate solution.
sodium aluminate solutiondecomposition crystallizationseed sizeactivation energy
NETL
NSTL
万方数据
