硫脲在碱性介质中的电化学行为  

Electrochemical behaviors of thiourea in alkaline medium

作　　者：王云燕[1] 柴立元[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083

出　　处：《中国有色金属学报》2008年第4期733-737,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50004009)

摘　　要：为表征硫脲在碱性介质中的电化学行为并为碱性硫脲浸金提供理论依据,采用稳态极化法和循环伏安法等电化学测试技术,系统研究碱性介质中硫脲的氧化分解电势、硫脲分解与浓度的关系。结果表明:硫脲的阳极氧化分解为不可逆反应,其氧化分解峰电流对应的电势约为0.5 V。硫脲浓度由0.05 mol/L增加至0.15 mol/L,其氧化分解的峰电流由1.559×10-4 A增大至9.068×10-4 A,峰电势由0.505 V负移至0.430 V,硫脲分解加剧。随pH值的升高,硫脲的氧化分解趋于严重,碱性介质中硫脲易于分解。In order to describe electrochemical behaviors of thiourea and provide fundamental for gold ore leached by alkaline thiourea system, the decomposed potential of thiourea oxidized in alkaline medium and the relationship between decomposition and concentration ofthiourea were studied in detail by the methods of electrochemical techniques, such as stable polarization and cyclic voltammetry. The results indicate that the decomposition of thiourea is irreversible, and the corresponding decomposition potential is 0.5 V. With the addition of thiourea concentration from 0.05 mol/L up to 0.15 mol/L, the decomposition of thiourea is accelerated, the peak current increases from 1.559×10^4 A up to 9.068×10^4 A and the peak potential moves from 0.505 V down to 0.430 V. The decomposition of thiourea becomes serious with increasing pH value of system.

关 键 词：硫脲 碱性介质 分解 电化学行为 

分 类 号：TF801[冶金工程—有色金属冶金]