铋熔体真空脱锌新工艺
来源期刊：中南大学学报(自然科学版)2012年第10期
论文作者：许妍 丘克强
文章页码：3769 - 3773
关键词：真空蒸馏；脱锌；铋熔体
Key words：vacuum refining; dezincification; bismuth melts
摘 要：对Bi-Zn二元系真空分离Zn的热力学原理进行分析和计算，同时研究温度、时间以及真空度等因素对真空分离锌效果的影响。研究结果表明：在温度为923 K、时间为30 min、体系压强为20 Pa的实验条件下，Zn含量3.71%(质量分数)的铋熔体蒸发率为4.1%，蒸余物中Zn含量降低到0.22%，Bi的纯度富集到99.78%。另外，Zn含量为1.02%~4.66%的铋熔体经过真空处理，Bi的纯度达到99.7%以上。铋熔体可通过真空方法有效除Zn，金属回收率高，并且对环境无污染，得到的Zn还可返回粗铋加锌提银工段再使用。
Abstract: The thermodynamics of vacuum refining bismuth melts to remove zinc was analyzed and calculated. The effects of temperature, refining time and vacuum degree on vacuum separation efficiency of zinc were also studied. The results show that the evaporation rate of zinc is 4.1% and bismuth in the residues is 99.78% when Bi-Zn alloy containing 3.71% (mass fraction) zinc is refined for 30 min at 923 K and 20 Pa. For Bi-Zn alloy containing 1.02%-4.66% zinc, bismuth in the residues is higher than 99.7% after vacuum refining. Impurity zinc can satisfactorily be removed from bismuth melts by vacuum refining. Moreover, vacuum treatment eliminates much of the air pollution and metal losses associated with other refining method, and so it has certain advantages over the existing techniques. Zinc obtained can be recycled in the section of extracting silver from crude bismuth by adding zinc.
许妍，丘克强
(中南大学 化学化工学院，有色金属资源化学教育部重点实验室，湖南 长沙，410083)
摘 要：对Bi-Zn二元系真空分离Zn的热力学原理进行分析和计算，同时研究温度、时间以及真空度等因素对真空分离锌效果的影响。研究结果表明：在温度为923 K、时间为30 min、体系压强为20 Pa的实验条件下，Zn含量3.71%(质量分数)的铋熔体蒸发率为4.1%，蒸余物中Zn含量降低到0.22%，Bi的纯度富集到99.78%。另外，Zn含量为1.02%~4.66%的铋熔体经过真空处理，Bi的纯度达到99.7%以上。铋熔体可通过真空方法有效除Zn，金属回收率高，并且对环境无污染，得到的Zn还可返回粗铋加锌提银工段再使用。
关键词：真空蒸馏；脱锌；铋熔体
XU Yan, QIU Ke-qiang
(Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education,
School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China)
Abstract:The thermodynamics of vacuum refining bismuth melts to remove zinc was analyzed and calculated. The effects of temperature, refining time and vacuum degree on vacuum separation efficiency of zinc were also studied. The results show that the evaporation rate of zinc is 4.1% and bismuth in the residues is 99.78% when Bi-Zn alloy containing 3.71% (mass fraction) zinc is refined for 30 min at 923 K and 20 Pa. For Bi-Zn alloy containing 1.02%-4.66% zinc, bismuth in the residues is higher than 99.7% after vacuum refining. Impurity zinc can satisfactorily be removed from bismuth melts by vacuum refining. Moreover, vacuum treatment eliminates much of the air pollution and metal losses associated with other refining method, and so it has certain advantages over the existing techniques. Zinc obtained can be recycled in the section of extracting silver from crude bismuth by adding zinc.
Key words:vacuum refining; dezincification; bismuth melts
