Theoretical Study on the Separation of Impurity Tellurium from Crude Selenium by Vacuum Distillation

Theoretical research on the separation of telluriumTellurium by vacuum distillationVacuum distillation from crude seleniumCrude selenium could provide further key data support for industrial production. In this work, theoretical and experimental studies on the separation of telluriumTellurium impurities from crude seleniumCrude selenium by vacuum distillationVacuum distillation were systematically carried out. The saturated vapor pressure, separation coefficient, vapor–liquid equilibrium composition, average molecular free path, and evaporation rate characteristics of selenium and telluriumTellurium under different distillationDistillation conditions were calculated theoretically. We conducted research on the volatilization characteristics of crude seleniumCrude selenium and measured the volatilization rate of crude seleniumCrude selenium under pressures of 498–573 K and 10–500 Pa using the vacuum differential method. The volatilization rate values of crude seleniumCrude selenium under different conditions were obtained, and the influences of distillationDistillation temperature and system pressure on the volatilization rate of crude seleniumCrude selenium were uncovered.