【摘要】 针对蓝辉铜矿、铜蓝和硫砷铜矿开展了表面选择性氧化浮选分离研究,并通过矿物表面接触角变化及XPS表面分析,阐明了3种矿物表面选择性氧化反应机制。结果显示,氧化剂次氯酸钙和高锰酸钾均可有效抑制蓝辉铜矿和铜蓝上浮,但对硫砷铜矿可浮性无影响;在丁铵黑药作用下,硫砷铜矿和蓝辉铜矿接触角均达到90°,经次氯酸钙氧化后,蓝辉铜矿接触角降至15°～30°,硫砷铜矿接触角仍高于86°;XPS分析结果表明,次氯酸促进了蓝辉铜矿表面的氧化,硫元素被氧化为SO₄^2-,以CuSO₄形式覆盖在矿物表面,增加了表面亲水性,而硫砷铜矿表面As、Cu和S元素并未发生明显的氧化反应,矿物表面维持较高的疏水性。次氯酸钙实现了蓝辉铜矿与硫砷铜矿表面选择性氧化,强化了两者的浮选分离。更多还原

【Abstract】 The flotation separation of enargite from digenite and covellite by selective surface oxidation was studied. Their selective oxidation mechanism was clarified by XPS analysis and measuring the change of surface contact angle（CA）. The results show that oxidants such as calcium hypochlorite and potassium permanganate can effectively depress the flotation of digenite and covellite, while the floatability of enargite remains unaffected. After the reaction with ammonium butyrate, both enargite and digenite have the CA of 90°. While after being oxidized by sodium hypochlorite, digenite has its CA decreased to 15°～30°, and enargite has its CA still higher than 86°. XPS results show that hypochlorite can enhance the surface oxidation of digenit. The sulfur thereon is oxidized to SO₄^2- and covered on the mineral in the form of CuSO₄, which can increase the surface hydrophilicity. However, there is no obvious oxidation observed for As, Cu and S elements on enargite, and the mineral surface maintains a high hydrophobicity. It is shown that calcium hypochlorite can realize the selective oxidation on the surface of enargite and digenite, thus enhance their flotation separation.更多还原