首页|Selective depression of Pb2+-activated sphalerite by potassium ferricyanide in Pb-Zn sulfides flotation separation
Selective depression of Pb2+-activated sphalerite by potassium ferricyanide in Pb-Zn sulfides flotation separation
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NSTL
Elsevier
The depression of sphalerite in the flotation separation of galena and sphalerite is usually difficult, especially when sphalerite is activated by Pb2+ ions dissolved from lead-bearing minerals. In this study, the cheap, efficient, and environmentally friendly regent of potassium ferricyanide (K-3[Fe(CN)(6)]) was used for the first time to efficiently separate galena from Pb2+ -activated sphalerite at neutral pH. Micro-flotation experiments, adsorption tests, contact angles, zeta potential analysis, X-ray photoelectron spectroscopy (XPS) analysis, and time-of-flight secondary ion mass (ToF-SIMS) were performed to investigate the depression mechanism of K-3[Fe(CN)(6)]. The micro-flotation test results showed that K-3[Fe(CN)(6)] had a considerable depression effect on Pb2+-activated sphalerite. Adsorption tests showed that competitive adsorption between K-3[Fe(CN)(6)] and sodium butyl xanthate (SBX) on the sphalerite surface reduced the amount of SBX adsorbed on the surface of Pb2+ -activated sphalerite, thereby depressing sphalerite. Contact angles analysis indicated that K-3[Fe(CN)(6)] treatment reduced the contact angle of Pb2+-activated sphalerite surface and weakened its hydrophobicity, providing a favorable condition for the separation of galena and Pb2+-activated sphalerite. Zeta potential measurements suggested that the KAFe (CN)(6)] effectively prevented the adsorption and interaction of sodium butyl xanthate (SBX) on the surface of Pb2+-activated sphalerite. Time-of-flight secondary ion mass (ToF-SIMS) and XPS analysis indicated that K-3[Fe(CN)(6)] could chemisorb onto the Zn sites on the surface of Pb2+-activated sphalerite and form hydrophilic precipitates containing Zn-3[Fe(CH)(6)](2), Zn3K2[Fe(CN)(6)](2), and Pb(OH)(2), which further generate a hydrophilic passivation layer, and reduced the floatability of Pb2+-activated sphalerite.
NSTL
Elsevier
