In this work, 2-((5-mercapto-1,3,4-thiadiazol-2-yl)thio)acetic acid (MTAA), a stable and eco-friendly organic small-molecule reagent, was introduced as chalcopyrite depressant for selective flotation separation of molybdenite from chalcopyrite. In the flotation experiments of single mineral and artificially mixed mineral, the recovery of chalcopyrite reduces from 90% to 5% in the pH range of 5 to 10 when MTAA (8 mg/L) is added. The results of IR and zeta potential show that there are two tautomers (thione and thiol) in solid MTAA, while in aqueous solution, MTAA is mainly in the form of thiol and reacts with copper ions. The results of XPS and Tof-SIMS measurements indicate that MTAA may react with copper ions to form a quaternary chelate structure via the S and N atoms. The DFT calculation results also show that MTAA is more likely to react with copper ions than iron ions.

在这项工作中，2-((5-mercapto-1,3,4-thiadiazol-2-yl)thio)乙酸（MTAA）是一种稳定且环保的有机小分子试剂，被引入作为黄铜矿抑制剂辉钼矿与黄铜矿的选择性浮选分离。在单一矿物和人工混合矿物的浮选实验中，加入MTAA（8 mg/L）后，在pH 5～10范围内，黄铜矿的回收率从90%降低到5%。IR和zeta电位结果表明，固体MTAA中存在两种互变异构体（硫酮和硫醇），而在水溶液中，MTAA主要以硫醇的形式与铜离子发生反应。XPS 和 Tof-SIMS 测量的结果表明，MTAA 可以与铜离子反应，通过 S 和 N 原子形成四元螯合物结构。