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根据热力学平衡理论及实验观测结果，探讨了铜电积过程中砷的电化学行为．得知：在采用不溶性阳极电积脱铜脱砷传统工艺流程中，砷酸在阴极发生还原反应形成亚砷酸，亚砷酸又与阳极产生的氧气发生氧化反应形成砷酸．在铜含量较低时阴极析出大量氢气，阳极析出氧气，极大地浪费了电能；在析出氢气的同时逸出砷化氢，砷酸、亚砷酸在阴极直接发生还原反应也产生砷化氢气体，从而严重地污染了环境．
According to the thermodynamic equilibrium theory and experimental observations, the electrochemical behavior of arsenic during copper electrowinning was discussed. It is known that in the traditional process of decarburization and arsenic removal using insoluble anode electrodeposition, arsenic acid is reduced to form arsenous acid in the cathode, and the arsenous acid is oxidized with oxygen generated in the anode to form arsenic acid. When the content of copper is low, a large amount of hydrogen is precipitated in the cathode and oxygen is precipitated in the anode, which greatly wastes power. Hydrogen arsenide, arsenic acid and arsenous acid escape simultaneously at the cathode to generate hydrogen arsine gas , Thus seriously polluting the environment.