(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 為表征硫脲在堿性介質(zhì)中的電化學(xué)行為并為堿性硫脲浸金提供理論依據(jù)，采用穩(wěn)態(tài)極化法和循環(huán)伏安法等電化學(xué)測(cè)試技術(shù)，系統(tǒng)研究堿性介質(zhì)中硫脲的氧化分解電勢(shì)、硫脲分解與濃度的關(guān)系。結(jié)果表明：硫脲的陽(yáng)極氧化分解為不可逆反應(yīng)，其氧化分解峰電流對(duì)應(yīng)的電勢(shì)約為0.5 V。硫脲濃度由0.05 mol/L增加至0.15 mol/L，其氧化分解的峰電流由1.559×10−
關(guān)鍵字: 硫脲；堿性介質(zhì)；分解；電化學(xué)行為
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract: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 of thiourea 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.
Key words: thiourea; alkaline medium; decomposition; electrochemical behavior
