Cu2+对磁化蒸馏水改善辉钼矿浮选效果的影响

Effect of Cu2+ on improvement of molybdenite floatability in magnetized distilled water

通过单矿物浮选实验、Zeta电位测试及X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和能谱(EDS)分析,研究了Cu2+对磁化蒸馏水改善辉钼矿浮选效果的影响。结果表明,用磁化蒸馏水浮选时,在煤油用量160 mg/L及2#油用量80 mg/L的条件下,Cu2+浓度为320 mg/L时辉钼矿回收率可达83.06%,比Cu2+浓度为0时的回收率增加了3.14个百分点,Cu2+对磁化蒸馏水改善辉钼矿浮选效果的影响较小。Cu2+和Cu(OH)+吸附在辉钼矿表面使其Zeta电位正向增大,有利于煤油在辉钼矿表面的吸附。辉钼矿表面上吸附的Cu2+和Cu(OH)+与溶液中的MoO42-反应生成CuMoO4沉淀并覆盖在辉钼矿断裂面上,抑制了辉钼矿断裂面中钼元素和硫元素的氧化反应及氧化钼溶解,最终对磁化蒸馏水改善辉钼矿浮选效果有积极影响。

Magnetized water can improve the flotation behaviors of sulfide minerals such as molybdenite effectively, but the beneficiation index was unstable in flotation process of molybdenite by use of magnetized water. In order to investigate the effect of Cu2+ on the improvement molybdenite floatability in magnetized distilled water, different samples were characterized by means of the flotation test of pure molybdenite, Zeta potential, X-ray photoelectron spectroscopy(XPS),scanning electron microscope(SEM) and energy dispersive spectrometer(EDS). The results showed that the floatability of molybdenite in magnetized distilledwater was improved with the addition of copper ion when the amount of kerosene was 160 mg/L and the amount of 2# oil was 80 mg/L. Furthermore, the molybdenite recovery rate reached 83.06% when the concentration of dissolved copper ion in magnetized distilled water was 320 mg/L. Compared with Cu2+ concentration of 0 mg/L, the flotation recovery rate of molybdenite increased by 3.14 percentage point. The Zeta potential of molybdenite in magnetized distilled water obviously increased positively direction because Cu2+ and Cu(OH)+ adsorbed on the surface of molybdenite. The Zeta potential of molybdenite increased with the increase of copper ions dosage which was beneficial to the adsorption of kerosene on molybdenite surface in local positive charge. The Cu2+ and Cu(OH)+adsorbed on the fracture surface of molybdenite interacted with MoO2-4 in magnetized distilled water formed copper molybdate which covered on molybdenite surface, which decreased amount and reaction probability of reactive molybdenum and sulfur on molybdenite surface then inhibited the oxidation of molybdenum and sulfur elements on molybdenite fracture surface and the dissolution reaction of molybdenum oxide into solution. Therefore it highly improved the flotation behaviors of molybdenite. This work provided a certain theoretical basis for improving the flotation efficiency of molybdenite with magnetized water, and it also provided some degree of reference for the application of magnetized water in the process of ore.