液相沉淀法制备微粉氢氧化铝动力学分析  

Kinetic Analysis on Preparation of Micro Power Aluminum Hydroxide by Liquid Precipitation Process

作　　者：王鹏[1] 魏徳洲[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2014年第7期1023-1027,1038,共6页Journal of Northeastern University(Natural Science)

基　　金：国家科技支撑计划项目(2012BAB01B00)

摘　　要：应用响应曲面法(RSM)和结晶宏观动力学对液相沉淀法制备微粉氢氧化铝过程进行了分析.响应曲面法研究表明:影响中位径的最主要因素为反应温度,其次依次为反应时间、分散剂的量和溶液的pH值;影响分形维数的最主要因素为分散剂的量,其次依次为溶液的pH值、反应温度和反应时间.结晶宏观动力学的研究表明:硫酸铝与氨水反应过程分为晶核生长期和晶粒长大期两个阶段;两个阶段的宏观结晶动力学方程均符合二级反应速率方程,表观活化能分别为0.51和1.27 kJ/mol.晶体生长机制研究表明,扩散控制机制是氢氧化铝晶核生长和晶粒长大的主导机制.Response surface methodology and kinetic analysis were introduced to study the process of cultivating micro power aluminum hydroxide by liquid precipitation process.The results from the response surface methodology show that the most important factor influencing median diameter is the reaction temperature,followed by reaction time,amount of dispersant and pH value,and the most important factor influencing fractal dimension is the amount of dispersant,followed by the pH value,reaction temperature and reaction time.According to the analysis of kinetics,aluminum sulfate and ammonia reaction process is divided into the crystal nucleus growth and grain growth period.The equations of crystallization kinetics accord with the second-order reaction rate equation,and the apparent activation energy are 0.51 and 1.27 kJ /mol,respectively.Crystal growth mechanism research indicates that diffusion control mechanism determines the crystal nucleus growth and crystal grain growth.

关 键 词：响应曲面法 微粉氢氧化铝 动力学 晶核生长 晶粒长大 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]