It is challenging to separate between molybdenite and chalcopyrite due to their comparable hydrophobic characteristics. Inorganic depressants were previously used to separate two minerals, but the results were unsatisfactory and polluted the environment. In this study, the molybdenite and chalcopyrite were separated using a highly effective and ecologically safe depressant, 2,4-Diamino-6-hydroxypyrimidine (DAHP). According to the single mineral experiment, chalcopyrite is totally depressed while molybdenite has superior floatability. The efficacy of DAHP as the depressant was validated by further artificially mixed mineral flotation experiments, indicating the possibility of separating chalcopyrite and molybdenite. The adsorption capacity experiment results showed that the adsorption capacity of DAHP on the surface of chalcopyrite was greater than that on the surface of molybdenite. Zeta potential experiment results show that DAHP is adsorbed on the surface of chalcopyrite and molybdenite through static electrostatic interactions. X-ray photoelectron spectroscopy (XPS) experiment results show that DAHP is mainly adsorbed on chalcopyrite surface through –NH group, which hinders the adsorption of kerosene. The electrostatic contact between DAHP and molybdenite has the least effect on kerosene adsorption. This study shows that DAHP has the potential to separate chalcopyrite and molybdenite as an efficient and environmentally friendly depressant.

中文翻译：

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环保抑制剂2,4-二氨基-6-羟基嘧啶在黄铜矿和辉钼矿分离中的作用及机理


由于辉钼矿和黄铜矿的疏水特性相当，因此分离辉钼矿和黄铜矿具有挑战性。以前曾用无机抑制剂来分离两种矿物，但结果并不理想，而且污染了环境。在本研究中，使用高效且生态安全的抑制剂 2,4-二氨基-6-羟基嘧啶 (DAHP) 分离辉钼矿和黄铜矿。根据单矿物实验，黄铜矿完全被抑制，而辉钼矿具有优异的可浮性。通过进一步的人工混合矿物浮选实验验证了DAHP作为抑制剂的功效，表明了分离黄铜矿和辉钼矿的可能性。吸附容量实验结果表明，DAHP在黄铜矿表面的吸附容量大于在辉钼矿表面的吸附容量。 Zeta电位实验结果表明，DAHP通过静态静电相互作用吸附在黄铜矿和辉钼矿表面。 X射线光电子能谱（XPS）实验结果表明，DAHP主要通过-NH基团吸附在黄铜矿表面，阻碍了煤油的吸附。 DAHP与辉钼矿之间的静电接触对煤油吸附的影响最小。这项研究表明，DAHP 有潜力作为一种高效且环保的抑制剂来分离黄铜矿和辉钼矿。