N-异丁氧羰基硫脲浮选黄铜矿的机理

发布时间：2018-03-27 06:23

  本文选题：N-异丁氧羰基硫脲　切入点：黄铜矿　出处：《中国有色金属学报》2017年01期

【摘要】：合成一种新型的表面活性剂——N-异丁氧羰基硫脲(iBCTU),对其结构进行红外和核磁共振表征,并考察其对黄铜矿的浮选性能以及在黄铜矿表面的吸附热力学和机理。浮选和吸附结果表明:在pH 3~11的范围内,iBCTU对黄铜矿具有良好捕收能力,且黄铜矿对iBCTU的吸附量随着温度的升高而增大。热力学分析表明:iBCTU在黄铜矿表面的吸附等温线符合Langmuir模型,吸附焓变△H为56.42 kJ/mol,熵变△S为284.76 J/(mol·K),吸附自由能变△G为-29.12 kJ/mol(298K),iBCTU在黄铜矿表面的吸附为自发、吸热化学吸附过程。XPS分析进一步说明iBCTU可能通过其硫代羰基的硫原子和-NH_2基氮原子与黄铜矿表面的铜原子结合生成iBCTU-Cu(Ⅰ)表面络合物吸附在黄铜矿表面。
[Abstract]:A new surfactant, N- isobutoxycarbonyl thiourea iBCTU, was synthesized, and its structure was characterized by IR and NMR. The flotation properties of chalcopyrite and its adsorption thermodynamics and mechanism on the surface of chalcopyrite were investigated. The results of flotation and adsorption showed that iBCTU had a good trapping capacity for chalcopyrite in the range of pH 3 ~ (11). The adsorption amount of iBCTU on chalcopyrite increases with the increase of temperature. Thermodynamic analysis shows that the adsorption isotherm of iBCTU on the surface of chalcopyrite accords with the Langmuir model. The adsorption enthalpy H is 56.42 KJ / mol, the entropy change is 284.76 J/(mol KN, and the adsorption free energy is -29.12 KJ / mol / mol 298KN BCTU on the surface of chalcopyrite. The endothermic chemisorption process. XPS analysis further indicates that iBCTU may form iBCTU-Cu( 鈪，

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