基于差重法测定真空蒸馏过程中单质碲的蒸发特性
Vacuum
(
IF
3.9
)
Pub Date : 2022-12-05
, DOI:
10.1016/j.vacuum.2022.111726
Daxin Huang
1,
2,
3,
4
,
Wenlong Jiang
1,
2,
3,
4
,
Baoqiang Xu
1,
2,
3,
4
,
Guozheng Zha
1,
2,
3,
4
,
Bin Yang
1,
2,
3,
4
,
Guolong Chen
1,
2,
3,
4
Affiliation
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China
Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming, 650093, China
National Engineering Research Center of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming, 650093, China
State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, 650093, China
减压蒸馏是制备高纯碲必不可少的工序。然而，实际蒸发速率、临界压力和蒸发系数等碲蒸发的动力学数据尚未见报道。在这项工作中，测量了不同温度和系统压力条件下碲的实际挥发率。详细分析了碲的真空挥发，表明在系统压力一定的情况下，碲挥发率的自然对数与温度的倒数成线性关系。此外，当蒸馏温度一定时，碲蒸发速率与系统压力满足Logistics非线性关系( ω actu = (A 1-A 2 )/[1+( p /p 0 ) a ]+A 2 )。在 Te 的熔点以上，临界压力的对数与温度的倒数呈线性关系 (lg p crit = 3.26–937.19/ T )。采用极限法计算出碲的实验最大蒸发速率，蒸发系数α在0.4~10之间。本研究提供了基本的蒸发参数，描述了碲在减压蒸馏下的行为，为减压蒸馏精制提供了理论指导。碲。
"点击查看英文标题和摘要"
Evaporation characteristics of elemental tellurium in the vacuum distillation process based on differential weight method measurement
Vacuum distillation is an indispensable process in the preparation of high purity tellurium. However, kinetic data of tellurium evaporation such as the actual evaporation rate, critical pressure, and evaporation coefficient have not been reported. In this work, the actual volatilization rate of tellurium was measured under different temperature and system pressure conditions. The vacuum volatilization of tellurium was analyzed in detail, which shows that there is a linear relationship between the natural logarithm of tellurium evaporation rate and the reciprocal of temperature, while the system pressure is constant. Additionally, when the distillation temperature is fixed, the tellurium evaporation rate and the system pressure meet the Logistics nonlinear relationship (ωactu = (A1-A2)/[1+(p/p0)a]+A2). Above the melting point of Te, the logarithm of critical pressure is linearly related to the reciprocal of the temperature (lgpcrit = 3.26–937.19/T). The experimental maximum evaporation rate of tellurium is calculated by the method of limiting and the evaporation coefficient α is between 0.4 and 10. The present study provides basic evaporation parameters, describes the behavior of tellurium under vacuum distillation, and offers theoretical guidance for vacuum distillation refining of tellurium.
更新日期：2022-12-07