Performance and analysis of key factors on the design of melt crystallization‐based separation process

Abstract

This study combines theoretical models with experiments to analyze the impurity migration mechanism and obtain the key factors of separation optimization for the design of layer melt crystallization. The fractal slice model was used to explore pore structure formation and calculate the heat properties of the crystal layer. It was found that the fractal characteristics approached the features of Euclidean geometry with increasing porosity, and the thermal conductivity showed a linear decrease with the porosity. Three kinetic models were established based on the temperature difference to reveal quantitative correlations with the degree of supercooling (or superheating). The effects of the pore structure, kinetic behavior, and sweating intensity on the separation process are highlighted. Finally, this work analyzed the important roles of kinetic factors and impurity migration distribution, where a qualitative analysis revealed that the kinetic effect was important in impurity migration in the sweating process.