Although azurite is one of the most important copper oxide minerals, the recovery of this mineral via sulfidization–xanthate flota-tion is typically unsatisfactory. The present work demonstrated the enhanced sulfidization of azurite surfaces using ammonia phosphate ((NH4)3PO4) together with Na2S, based on micro-flotation experiments, time-of-flight secondary ion mass spectrometry (ToF-SIMS), X-ray photoelectron spectroscopy (XPS), zeta-potential measurements, contact angle measurements, Fourier-transform infrared (FT-IR) spectro-scopy, and ultraviolet–visible (UV–Vis) spectroscopy. Micro-flotation experiments showed that the floatability of azurite was increased fol-lowing the simultaneous addition of (NH4)3PO4 and Na2S. ToF-SIMS and XPS analyses demonstrated the formation of a high content of S spe-cies on the azurite surface and an increase in the number of Cu(I) species after exposure to (NH4)3PO4 and Na2S, compared with the azurite–Na2S system. The zeta potential of azurite particles was negatively shifted and the contact angle on the azurite surface was increased with the addition of (NH4)3PO4 prior to Na2S. These results indicate that treatment with (NH4)3PO4 enhances the sulfidization of azurite sur-faces, which in turn promotes xanthate attachment. FT-IR and UV–Vis analyses confirmed that the addition of (NH4)3PO4 increased the ad-sorption of xanthate with reducing the consumption of xanthate during the azurite flotation process. Thus, (NH4)3PO4 has a beneficial effect on the sulfidization flotation of azurite.

Qian Zhang;Shuming Wen;Qicheng Feng;Han Wang

State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Faculty of Land Resource Engineering,Kunming University of Science and Tech-nology,Kunming 650093,China

矿物冶金与材料学报

[1]Qian Zhang;Shuming Wen;Qicheng Feng;Han Wang-.Enhanced sulfidization of azurite surfaces by ammonium phosphate and its effect on flotation)[J].矿物冶金与材料学报,2022(06):1150-1160

sulfidization,azurite,flota

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