铜电解液中的As、Sb、Bi离子含量是影响阴极铜质量的重要因素,现有的电解沉积法电耗高、铜损失量大,萃取方法和离子交换法存在液量大的缺陷。本文利用SO_(2)还原As^(5+)和Sb^(5+)、H_(2)O_(2)氧化As3+和Sb3+调整化合价,促使砷锑铋形成...铜电解液中的As、Sb、Bi离子含量是影响阴极铜质量的重要因素,现有的电解沉积法电耗高、铜损失量大,萃取方法和离子交换法存在液量大的缺陷。本文利用SO_(2)还原As^(5+)和Sb^(5+)、H_(2)O_(2)氧化As3+和Sb3+调整化合价,促使砷锑铋形成沉淀阳极泥的原理,进行了二氧化硫和双氧水并流沉淀方法降低铜电解液中砷锑铋杂质离子的实验研究,结果表明:一定条件下,单独向铜电解液中通入SO_(2)可以降低Sb离子浓度,但As、Bi离子浓度的变化幅度不大;单独向铜电解液中通入H_(2)O_(2)可以降低As、Sb离子浓度,但也会降低Cu、Bi离子浓度,严重时导致阳极钝化;在最佳条件下,H_(2)O_(2)采用滴加方式、加入量为4 m L/L、SO_(2)进气浓度为0.125 g/L、搅拌速度为250 r/min、反应温度为50℃,并流沉淀技术可以实现降低铜电解液中砷锑铋杂质离子的目的,且不会出现阳极钝化现象。展开更多
The corrosion behavior of pure copper exposed to the atmosphere of Nansha Islands for 21 months was studied by mass loss method,composition analysis,morphology observation and electrochemical measurements.The results ...The corrosion behavior of pure copper exposed to the atmosphere of Nansha Islands for 21 months was studied by mass loss method,composition analysis,morphology observation and electrochemical measurements.The results showed that the average corrosion rate of copper exposed for one year was approximately 7.85μm/a,implying that Nansha Islands was classified as a corrosion category of CX.The structure and properties of the corrosion product layer generated on the front and back sides of the exposed sample differed significantly.The inner corrosion product layer(Cu2O)on the front side was relatively thick and dense,whereas the outer product layer(Cu2Cl(OH)3)was extremely thin.However,the outer product layer on the back side was thicker than the inner layer.Electrochemical measurements indicated that the protection afforded by the corrosion product layer on the front side was improved gradually,while that on the back side was deteriorated.展开更多
文摘铜电解液中的As、Sb、Bi离子含量是影响阴极铜质量的重要因素,现有的电解沉积法电耗高、铜损失量大,萃取方法和离子交换法存在液量大的缺陷。本文利用SO_(2)还原As^(5+)和Sb^(5+)、H_(2)O_(2)氧化As3+和Sb3+调整化合价,促使砷锑铋形成沉淀阳极泥的原理,进行了二氧化硫和双氧水并流沉淀方法降低铜电解液中砷锑铋杂质离子的实验研究,结果表明:一定条件下,单独向铜电解液中通入SO_(2)可以降低Sb离子浓度,但As、Bi离子浓度的变化幅度不大;单独向铜电解液中通入H_(2)O_(2)可以降低As、Sb离子浓度,但也会降低Cu、Bi离子浓度,严重时导致阳极钝化;在最佳条件下,H_(2)O_(2)采用滴加方式、加入量为4 m L/L、SO_(2)进气浓度为0.125 g/L、搅拌速度为250 r/min、反应温度为50℃,并流沉淀技术可以实现降低铜电解液中砷锑铋杂质离子的目的,且不会出现阳极钝化现象。
基金The authors are grateful for the financial supports from National Natural Science Foundation of China(51671197)Strategic Priority Research Program of Chinese Academy of Sciences(13040502).
文摘The corrosion behavior of pure copper exposed to the atmosphere of Nansha Islands for 21 months was studied by mass loss method,composition analysis,morphology observation and electrochemical measurements.The results showed that the average corrosion rate of copper exposed for one year was approximately 7.85μm/a,implying that Nansha Islands was classified as a corrosion category of CX.The structure and properties of the corrosion product layer generated on the front and back sides of the exposed sample differed significantly.The inner corrosion product layer(Cu2O)on the front side was relatively thick and dense,whereas the outer product layer(Cu2Cl(OH)3)was extremely thin.However,the outer product layer on the back side was thicker than the inner layer.Electrochemical measurements indicated that the protection afforded by the corrosion product layer on the front side was improved gradually,while that on the back side was deteriorated.
