(中南大学 化学化工学院，长沙 410083)
摘 要: 以异丙基钠黄药、苄基氯、乙胺、二硫化碳和氢氧化钠为原料合成苄基三硫代碳酸钠(BTTC)和乙硫氨酯(IPETC)捕收剂，对BTTC进行结构表征，考察BTTC对黄铜矿的浮选性能及其在黄铜矿表面的吸附机理。结果表明：在三硫代碳酸盐分子中引入第3个硫原子有利于增强捕收剂的捕收能力，BTTC对黄铜矿的捕收性能优于异丁基钠黄药(SIBX)和苄基钠黄药(BzX)。红外光谱、X射线光电子能谱(XPS)分析以及密度泛函理论(DFT)计算表明，BTTC分子中的硫原子与矿物表面的金属Cu作用，形成BTTC-Cu的表面络合物，从而以化学方式吸附在黄铜矿的表面。
关键字: 苄基三硫代碳酸钠；黄铜矿；浮选；DFT计算
（College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:Sodium benzyl trithiocarbonate (BTTC) and O-isopropyl-N-ethyl thionocarbamate (IPETC) were synthesized via reaction of sodium isopropyl xanthate, benzyl chloride, ethylamine, carbon disulfide and sodium hydroxide, and characterized by a variety of techniques. The flotation performance and adsorption mechanism of BTTC on the chalcopyrite were investigated. The flotation results show that BTTC exhibits better collecting performance relative to sodium isobutyl xanthate (SIBX) and sodiun benzyl xanthate (BzX). It is concluded that when all three sulphur atoms in BTTC bond to the mineral surface, an increased hydrophobicity results when compared to xanthates where the oxygen does not bond to the surface. The results of FTIR spectra, XPS density functional theory (DFT) calculation indicate that BTTC might bond with the copper atoms on the chalcopyrite surface through its sulfur atoms to form BTTC-Cu surface complexes.
Key words: sodium benzyl trithiocarbonate; chalcopyrite; flotation; DFT calculation
