The surface features of activated stibnite surface with copper or lead ion
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State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming, 650093, Yunnan, PR China
Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, PR China
Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming, 650093, Yunnan, PR China
Corresponding author
Qinbo Cao   

Kunming University of Science and Technology, Faculty of Land Resources Engineering, Kunming University of Science and Technology, 650093 kunming, China
Physicochem. Probl. Miner. Process. 2018;54(3):763-770
Cu2+ and Pb2+ are widely used as activators for the flotation of stibnite. In this work, by the treatment of Cu2+ or Pb2+, the activation product and the thickness of activation layer on the stibnite surface were both investigated. Based on the flotation results, zeta potential analysis and X-ray photoelectron spectroscopy (XPS) study, it was found that Cu2+ was reduced to Cu+ at the stibnite surface and a layer of Cu2S was formed at the surface. While, a PbS layer presenting at the stibnite surface is responsible for the activation flotation of stibnite with Pb2+. Time of flight secondary ion mass spectrometry (TOF-SIMS) analysis further implies that, when stibnite was activated with 5×10-5 mol/dm3 of CuSO4 or Pb(NO3)2, the thickness of Cu2S layer on the Cu-activated surface was close to 2.7 nm, while the thickness of PbS layer was about 1.8 nm on the Pb-activated surface.
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