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中南大学学报(自然科学版)

Journal of Central South University

第31卷    第1期    总第131期    2000年2月

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文章编号:1004-0609(2000)01-0101-04
砷化氢析出电势的探讨
仇勇海,唐仁衡,陈白珍

(中南工业大学资源环境与建筑工程学院,长沙 410083)

摘 要: 据热力学参数,计算得到砷酸、亚砷酸、单质砷析出砷化氢的标准平衡电势值分别为0.144 V, 0.005V,-0.238 V。在铜电解液净化工序中,砷酸优先于亚砷酸析出砷化氢,当阴极电势足够负时,三者共同放电析出砷化氢。计算结果与实测结果基本吻合,均表明砷化氢析出的标准平衡电势值正于-0.608 V。在铜净液工序中,采用控制阴极电势脱铜脱砷电积法,能有效抑制砷化氢的析出。

 

关键字: 砷化氢;析出电势;铜电解液

Evolution potential of arsine
QIU Yong-hai, TANG Ren-heng, CHEN Bai-zhen

College of Resource, Environment and Civil Engineering,
Central South University of Technology, Changsha 410083, P.R.China

Abstract:The standard equilibrium potentials of evolving AsH3 from arsenic acid, arsenious acid and element arsenic are thermodynamically calculated as 0.144V, 0.005V, -0.238 V respectively. In the processing of the purification of copper electrolyte, arsenic acid prior to arsenious acid evolves AsH3. When cathodic potential is negative enough, arsenic acid, arsenious acid and element arsenic co-discharge and AsH3 is evolved. The results of thermodynamical calculation are basically concordance with the measured results. The standard equilibrium potential of AsH3 evolution is absolutely more positive than -0.608V. In the processing of the purification of copper electrolyte, the separation of copper and arsenic by electrowinning of controlling cathodic potential can prevent AsH3 from evolving effectively.

 

Key words: arsine; evolution potential; copper electrolyte

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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