摘要
在铋盐水解制备氯氧化铋的反应结晶过程中,控制氯氧化铋晶体成核和生长速率可影响氯氧化铋晶体的形貌、粒径和分散性。为此,选用间歇动态法研究了氯氧化铋晶体成核与生长动力学,采用矩量变换法建立了结晶过程动力学模型,并用最小二乘法对实验数据进行多元线性回归,获取了动力学模型参数。研究结果表明:当氯氧化铋晶体粒度≥3μm时,其晶体生长速率符合粒度无关生长模型;晶浆悬浮密度和过饱和度对成核速率均有显著影响;溶液过饱和度对成核速率的影响较生长速率的影响更为显著。
In the preparation of bismuth oxychloride （BiOC1） by hydrolysis method and with bismuth salt as raw material, the morphology,particle size, and dispersibility of BLOCl crystals would be influenced by the crystal nucleation and growth rate of BiOCl.In allusion to the problems ,the crystal nucleation and growth kinetics of BiOCl were investigated by intermittent dynamic method ,the dynamic model of crystallization process was established by moment transformation method and the kinetic parameters were obtained by least square method for the multivariate linear regression.Results showed that the growth of BiOCl obeyed the size-independent growth model when the particle size was larger than 3 μm;and that both of the suspension density and supersaturation had significant effect on the nucleation rate ; and the supersaturation had a greater effect on nucleation rate than on the growth rate.
出处
《无机盐工业》
CAS
北大核心
2014年第9期16-20,共5页
Inorganic Chemicals Industry
基金
国家自然科学基金资助项目(21376251)
国家高技术研究发展计划(863计划)资助项目(2011AA060702)
国家重点基础研究计划(973计划)资助项目(2013CB632600)
关键词
氯氧化铋
反应结晶
动力学
间歇动态法
bismuth oxychloride
reaction crystallization
kinetics
intermittent dynamic method
