本文应用流化床内固体浓度差产生的浮力与具有不同物性颗粒的扩散之间的动态平衡原理,研究铁珠与黄砂系统在内径为38mm 移动流化床内的混合与分级,包括流化速度和颗粒移动速度对分级的影响。采用的分级指数定义为:N=S~*/Z·X_v=1-in...本文应用流化床内固体浓度差产生的浮力与具有不同物性颗粒的扩散之间的动态平衡原理,研究铁珠与黄砂系统在内径为38mm 移动流化床内的混合与分级,包括流化速度和颗粒移动速度对分级的影响。采用的分级指数定义为:N=S~*/Z·X_v=1-integral from 0 to Z XvdZ/Z·integral from 0 to 1 XvdZ分级指数的范围为0<N<1;完全分级时 N=1,完全混合时 N=0。展开更多
The single crystal growth rates of potassium sulfate in pure aqueous solution under different conditions were determined by photomicrography in a flow system for crystal growth. The effects of the main controlling fac...The single crystal growth rates of potassium sulfate in pure aqueous solution under different conditions were determined by photomicrography in a flow system for crystal growth. The effects of the main controlling factors, such as supersaturation, crystal size, solution velocity and crystal growth temperature, on crystal growth rates of potassium sulfate were discussed in detail by using non-linear regression from the experimental data, and several empirical relationships were given.The results showed that the growth rates of crystals increased with supersaturation, crystal size, solution velocity and temperature. Moreover supersaturation was the most important controlling factor influencing growth rates of crystals,crystal size and solution velocity were the secondary and temperature was the least. Furthermore, It was found that the growth rate of crystals along the crystallographic axis was higher than that along the in the same condition. The effect of every factor on crystal growth rates along the crystallographic axis was stronger than that along the .展开更多
The growth of vitamin C single crystals was studied by direct observation In flowing solution, the linear growth rates of three orientations (, , ) were measured for vitamin C water system The experiments were designe...The growth of vitamin C single crystals was studied by direct observation In flowing solution, the linear growth rates of three orientations (, , ) were measured for vitamin C water system The experiments were designed as orthogonal test to investigate the effect of various factors Comparing with temperature and velocity, supersaturation is the most important factor And the relations between growth and supersaturation were different with crystal directions, which obviously show anisotropy The order of magnitude of G , G , G and their dependency on supersaturation ( g , g , g ) were in good agreement with analysis of maximum difference The effect of solution diffusion could be neglected and crystal growth was controlled by surface reaction According to the growth models, the growth mechanism was展开更多
文摘本文应用流化床内固体浓度差产生的浮力与具有不同物性颗粒的扩散之间的动态平衡原理,研究铁珠与黄砂系统在内径为38mm 移动流化床内的混合与分级,包括流化速度和颗粒移动速度对分级的影响。采用的分级指数定义为:N=S~*/Z·X_v=1-integral from 0 to Z XvdZ/Z·integral from 0 to 1 XvdZ分级指数的范围为0<N<1;完全分级时 N=1,完全混合时 N=0。
文摘The single crystal growth rates of potassium sulfate in pure aqueous solution under different conditions were determined by photomicrography in a flow system for crystal growth. The effects of the main controlling factors, such as supersaturation, crystal size, solution velocity and crystal growth temperature, on crystal growth rates of potassium sulfate were discussed in detail by using non-linear regression from the experimental data, and several empirical relationships were given.The results showed that the growth rates of crystals increased with supersaturation, crystal size, solution velocity and temperature. Moreover supersaturation was the most important controlling factor influencing growth rates of crystals,crystal size and solution velocity were the secondary and temperature was the least. Furthermore, It was found that the growth rate of crystals along the crystallographic axis was higher than that along the in the same condition. The effect of every factor on crystal growth rates along the crystallographic axis was stronger than that along the .
文摘The growth of vitamin C single crystals was studied by direct observation In flowing solution, the linear growth rates of three orientations (, , ) were measured for vitamin C water system The experiments were designed as orthogonal test to investigate the effect of various factors Comparing with temperature and velocity, supersaturation is the most important factor And the relations between growth and supersaturation were different with crystal directions, which obviously show anisotropy The order of magnitude of G , G , G and their dependency on supersaturation ( g , g , g ) were in good agreement with analysis of maximum difference The effect of solution diffusion could be neglected and crystal growth was controlled by surface reaction According to the growth models, the growth mechanism was
