Flotation and electrochemical behaviors of chalcopyrite and pyrite in the presence of N-propyl-N′-ethoxycarbonyl thiourea

The characteristics of N-propyl-N′-ethoxycarbonyl thiourea（PECTU） were studied in the flotation experiments of chalcopyrite and pyrite compared with butyl xanthate（BX）. The interaction mechanism between mineral and PECTU was investigated according to zeta potential and electrochemistry measurements in the presence of PECTU. The results proved that PECTU performed a stronger ability to capture chalcopyrite and a better selectivity against pyrite. The zeta potential of chalcopyrite was positively shifted after interacting with PECTU, which indicated that the collector PECTU was obviously adsorbed on chalcopyrite surface. The cyclic voltammetry and Tafel curves results indicated that the oxidation and corrosion rates of chalcopyrite surface were limited in the presence of PECTU, while the effect of PECTU on pyrite in weak alkaline solution can be neglected basically according to the results of zeta potential and electrochemical tests.

N-丁氧丙基-N′-乙氧羰基硫脲对硫化矿物的浮选行为与吸附机理

通过考察N-丁氧丙基-N′-乙氧羰基硫脲（BOPECTU）对黄铜矿、黄铁矿和闪锌矿的浮选行为,研究其与Cu2＋、Zn^2＋、Fe^3＋或Fe^2＋的作用及其在这3种硫化矿物表面的吸附机理。结果表明：BOPECTU可通过其分子中的硫和氮原子与溶液中的Cu^2＋作用而生成螯合物,而BOPECTU与Zn^2＋、Fe^3＋或Fe^2＋之间的作用较弱,实验条件下可能不存在化学作用。BOPECTU是黄铜矿的优良捕收剂,其浮选黄铜矿适宜的pH值范围为6.0-10.0,而其对黄铁矿和闪锌矿的捕收能力较弱。红外光谱结果表明,BOPECTU主要以化学作用方式吸附在黄铜矿表面,而其在黄铁矿和闪锌矿表面的吸附可能为物理吸附。