晶种粒度对过饱和铝酸钠溶液分解结晶反应动力学过程的影响  

Effect of Seed Size on the Kinetics of Decomposition and Crystallization Reaction in Supersaturated Sodium Aluminate Solution

作　　者：蒋斌 苏向东[1,3] 周念 张建刚 JIANG Bin;SU Xiangdong;ZHOU Nian;ZHANG Jiangang(College of Materials and Metallurgy,Guizhou University,Guiyang 550025,China;School of Materials and Energy Engineering,Guizhou Institute of Technology,Guiyang 550003,China;Guizhou Key Laboratory of Light Metal Materials Preparation Technology,Guizhou Institute of Technology,Guiyang 550003,China)

机构地区：[1]贵州大学材料与冶金学院,贵阳550025 [2]贵州理工学院材料与能源工程学院,贵阳550003 [3]贵州省轻金属材料制备技术重点实验室,贵阳550003

出　　处：《有色金属工程》2024年第9期86-93,共8页Nonferrous Metals Engineering

基　　金：贵州省科技计划项目(ZK-[2022]一般192);贵州省教育厅科技创新人才团队(黔教技[2023]078);贵州省高等学校流程性工业新过程工程研究中心(黔教技[2022]034)。

摘　　要：以过饱和铝酸钠溶液为研究体系,以氢氧化铝为诱导分解结晶反应晶种,研究分析反应过程中晶种粒度对表观活化能的影响。结果表明,随着晶种粒度减小,表观活化能降低,分解率升高。晶种颗粒形貌近似于椭球形模型,基于该模型引入了比表面能对Arrhenius公式中的表观活化能进行修正,表观活化能与晶种粒度的倒数之间呈线性关系。这一结果表明,降低诱导结晶的晶种粒度使分解率升高的机理是由于晶种引入了额外比表面能,该比表面能降低了铝酸钠溶液分解反应过程的表观活化能,从而使分解率升高。建立了晶种粒度与反应分解率之间的定量关系,为过饱和铝酸钠溶液分解过程的优化控制提供了理论依据。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.

关 键 词：铝酸钠溶液 分解结晶 晶种粒度 活化能 

分 类 号：TF821[冶金工程—有色金属冶金] TF111