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Activation mechanism of zinc ions in cassiterite flotation with benzohydroxamic acid as a collector

Yang Cao, Lei Sun

2017enflotationcassiteritezinccollectorminerals

Abstract

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The presence of Pb2+ can activate cassiterite flotation; however, its biotoxicity may lead to environmental issues. Therefore, this study investigates the feasibility of using Zn2+ instead of Pb2+ in cassiterite flotation. The effects and mechanism of Zn2+ on the floatability of cassiterite were analyzed using benzohydroxamic acid (BHA) as the collector. Results indicated a higher recovery of cassiterite in the presence of Zn2+ than in the presence of Pb2+. The maximum recovery of cassiterite in the presence of Zn2+ reached 90.54%, attributed to an increase in the adsorption quantity of BHA on the cassiterite surface with Zn2+. Further chemical analyses indicated that BHA and Zn2+ were primarily present in the form of BHA molecules and Zn(OH)+ at pH 7.5–8.0. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) confirmed that Zn(OH)+ reacted with OH– on the cassiterite surface to form a Zn-O bond. This metallic bonding, in combination with BHA molecules, generated a new chelate ring structure (-Sn-O-Zn-BHA), allowing for a firmer attachment of BHA on the cassiterite surface, resulting in increased cassiterite recovery.

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Cite This Work

@article{1ff647af-c20b-494a-add2-9980736419a0,
  title={Activation mechanism of zinc ions in cassiterite flotation with benzohydroxamic acid as a collector},
  author={Yang Cao and Lei Sun},
  year={2017},
  language={en}
}
TY  - JOUR
TI  - Activation mechanism of zinc ions in cassiterite flotation with benzohydroxamic acid as a collector
AU  - Yang Cao
AU  - Lei Sun
PY  - 2017
LA  - en
ER  -

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