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<p>Pyrite depression by oxidants has attracted much interest in the field of sulfide flotation separation. However, the mechanisms of oxidant action in seawater remain unclear from a radical-oxidation perspective. In this study, the influence of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) on pyrite flotation in seawater was systematically investigated. The results showed that pyrite was more significantly depressed by H<sub>2</sub>O<sub>2</sub> in seawater than in pure water; 0.05 vol.% H<sub>2</sub>O<sub>2</sub> resulted in unfloatable pyrite in seawater and decreased pyrite recovery from 81.05% to 60.81% in pure water. Contact angle, Fourier transform infrared spectroscopy (FTIR), and in situ scanning electrochemical microscopy (SECM) studies cross-confirmed that H<sub>2</sub>O<sub>2</sub> reduced the surface hydrophobicity and electrochemical reactivity of pyrite, preventing the adsorption of sodium butyl xanthate (SBX). Further UV-visible and electron paramagnetic resonance (EPR) analyses revealed that SBX was first oxidized to butyl xanthate peroxide and further decomposed into smaller molecules including CO<sub>2</sub>, H<sub>2</sub>O, and SO<sub>4</sub><sup>2−</sup> in seawater by the formed radical (<sup>•</sup>O<sub>2</sub><sup>−</sup> and <sup>•</sup>OH) via a Fenton-like oxidation pathway. Therefore, this study presents a novel radical oxidation perspective to understand pyrite depression using H<sub>2</sub>O<sub>2</sub> in low-alkaline seawater, providing scientific evidence for effective pyrite depression in seawater by a clean green oxidant.</p>

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Microscopic Mechanism of Pyrite Depression in a Seawater Flotation System: The Pathway of Radical Oxidation Due to Hydrogen Peroxide

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Zhonghong Wang,
  • Yubiao Li,
  • Wanqing Li,
  • Tianle Yin,
  • Jialong Zhao,
  • Wen Chen

摘要

Pyrite depression by oxidants has attracted much interest in the field of sulfide flotation separation. However, the mechanisms of oxidant action in seawater remain unclear from a radical-oxidation perspective. In this study, the influence of hydrogen peroxide (H2O2) on pyrite flotation in seawater was systematically investigated. The results showed that pyrite was more significantly depressed by H2O2 in seawater than in pure water; 0.05 vol.% H2O2 resulted in unfloatable pyrite in seawater and decreased pyrite recovery from 81.05% to 60.81% in pure water. Contact angle, Fourier transform infrared spectroscopy (FTIR), and in situ scanning electrochemical microscopy (SECM) studies cross-confirmed that H2O2 reduced the surface hydrophobicity and electrochemical reactivity of pyrite, preventing the adsorption of sodium butyl xanthate (SBX). Further UV-visible and electron paramagnetic resonance (EPR) analyses revealed that SBX was first oxidized to butyl xanthate peroxide and further decomposed into smaller molecules including CO2, H2O, and SO42− in seawater by the formed radical (•O2− and •OH) via a Fenton-like oxidation pathway. Therefore, this study presents a novel radical oxidation perspective to understand pyrite depression using H2O2 in low-alkaline seawater, providing scientific evidence for effective pyrite depression in seawater by a clean green oxidant.