CAJ | 학술논문

采用循环伏安、Tafel法及红外光谱分析研究了新型硫脲类捕收剂CPTU在黄铜矿及黄铁矿表面吸附的电化学行为及机理。试验结果表明，当pH值低于9．18时，黄铜矿电极从0 V左右开始氧化，出现了一个新的氧化峰，CPTU在黄铜矿表面电化学吸附形成疏水性产物Cu（ CPTU）和单质S；随着pH值增大，氧化峰电流减小，疏水性增强并产生钝化；当pH值高于11．0时，黄铜矿自身的氧化占据了主导地位。对于黄铁矿而言，在整个pH范围内，捕收剂CPTU的加入并未改变循环伏安曲线的形状。并且，碱性条件下黄铁矿腐蚀反应产物更容易在矿物表面形成氢氧化物沉淀，阻碍了CPTU在其表面电化学反应的进行，证明CPTU对黄铜矿和黄铁矿的捕收有选择性。红外光谱分析表明，CPTU在黄铜矿表面的吸附属于化学吸附，而在黄铁矿表面的吸附属于物理吸附。
채용순배복안、Tafel법급홍외광보분석연구료신형류뇨류포수제CPTU재황동광급황철광표면흡부적전화학행위급궤리。시험결과표명，당pH치저우9．18시，황동광전겁종0 V좌우개시양화，출현료일개신적양화봉，CPTU재황동광표면전화학흡부형성소수성산물Cu（ CPTU）화단질S；수착pH치증대，양화봉전류감소，소수성증강병산생둔화；당pH치고우11．0시，황동광자신적양화점거료주도지위。대우황철광이언，재정개pH범위내，포수제CPTU적가입병미개변순배복안곡선적형상。병차，감성조건하황철광부식반응산물경용역재광물표면형성경양화물침정，조애료CPTU재기표면전화학반응적진행，증명CPTU대황동광화황철광적포수유선택성。홍외광보분석표명，CPTU재황동광표면적흡부속우화학흡부，이재황철광표면적흡부속우물리흡부。
The electrochemical behavior and mechanism of a new type thiourea collector, CPTU, being adsorbed on the surface of chalcopyrite and pyrite were studied by Tafel, CA voltammetry and infrared spectroscopy. For chalcopyrite, an oxidation peak appeared from about 0 V with pH<9. 18, which meant that the hydrophobic entity Cu ( CPTU) and elemental S were formed thereon, and the oxidation peak currents decreased with the increasing of pH value, resulting in a strengthened hydrophobicity and surface passivation, while, its self-oxidation predominated at a pH value over 11.0. With regard to pyrite, the curve shape of CA voltammetry remained unchanged throughout the entire pH range in the presence of CPTU. Furthermore, as the hydroxide product of corrosion reaction was easier to deposit onto pyrite surface and therewith prevented its electrochemistry reaction with CPTU, the selectivity of CPTU in collecting chalcopyrite and pyrite could be explained. Infrared spectroscopy analysis indicated that CPTU is chemisorbed onto chalcopyrite and physisorbed onto pyrite.