Removal of impurities from crude lead with high impurities by vacuum distillation and its analysis

被引：37
|
作者：
Kong, XiangFeng [1 ,3 ]
Yang, Bin [1 ,3 ]
Xiong, Heng [1 ,2 ,3 ]
Liu, DaChun [1 ,2 ,3 ]
Xu, BaoQiang [1 ,2 ,3 ]
机构：
[1] Kunming Univ Sci & Technol, Natl Engn Lab Vacuum Met, Kunming 650093, Yunnan, Peoples R China
[2] State Key Lab Breeding Base Complex Nonferrous Me, Kunming 650093, Yunnan, Peoples R China
[3] Key Lab Vacuum Met Nonferrous Met Yunnan Prov, Kunming 650093, Yunnan, Peoples R China
来源：
VACUUM | 2014年 / 105卷
关键词：
Vacuum distillation; Crude lead; Removal; Separation;
D O I：
10.1016/j.vacuum.2014.01.012
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A novel technology was developed to remove impurities from crude lead with high impurities by vacuum distillation. Refined lead (purity over 99%) was achieved through vacuum distillation using crude lead (92.88%) with high impurities as input material under a dynamic vacuum of 5-15 Pa. The results show that vacuum distillation should be taken to obtain lead from crude lead matrix, in which low-volatile impurities namely Cu, Sn, Ag and partial Sb are concentrated in residue at the first fraction stage of 1373 K. Volatilized lead containing high-volatile impurities such as Zn and As is distilled to remove these impurities at the second fraction stage of 973 K. But the property of impurity Bi is similar to lead that can not be separated from crude lead. The separation coefficient (beta i) and the activity coefficient (gamma i) of impurity elements are calculated according to the experiments to fill the inadequate data of the thermodynamics. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：17 / 20
页数：4
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