Short communicationSelective separation of copper-molybdenum sulfides using Humic acid (cas 1415-93-6)s

Add time:09/28/2019    Source:sciencedirect.com

Humic acids (HA), a major component of humus or soil, was explored as a selective depressant for molybdenite during the flotation separation of molybdenite and chalcopyrite. Microflotation tests on single minerals revealed that chalcopyrite flotation was not affected by HA from pH 3 to 11, while molybdenite was strongly depressed by HA in the same pH range. Microflotation tests on chalcopyrite-molybdenite mixtures proved that HA could selectively depress the molybdenite flotation without significantly affecting the flotation of chalcopyrite. Infrared spectroscopy revealed that HA strongly adsorbs on molybdenite surfaces while no detectable HA was observed on chalcopyrite surfaces after being wash thoroughly with Milli-Q water. In addition, the infrared spectroscopy also indicates the adsorption of HA on molybdenite (basal planes) is likely governed by hydrophobic interaction while chemical interaction is absent. However, the interactions between HA and chalcopyrite are most likely to be weak interactions such as electrostatic interaction etc., and the adsorbed HA are likely detached (or partially detached) after rinsing or xanthate addition. Our work showed that HA could be utilized as a promising depressant for molybdenite during the flotation separation of copper-molybdenum sulfides over a wide range of pH.

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