Effect of ultrasonic treatment on the surface hydrophobicity of pyrite: Properties and mechanism of ultrasonic products

[Display omitted] •Ultrasonic-generated Fe ions and suspended substances reduce pyrite hydrophobicity.•Fe2+ oxidation to Fe3+ via dissolved oxygen consumption enhances pyrite oxidation.•Suspended substances outcompete pyrite in sodium butyl xanthate adsorption.•The hydrophobicity of pyrite is poor i...

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Published inMinerals engineering Vol. 233; p. 109661
Main Authors Lin, Qiqiang, Sun, Lei, Cao, Yang, Xiang, Meitao, Guo, Yuanhao, Gao, Zhiyong, Xie, Jie, Sun, Wei
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.11.2025
Subjects
Dissolved oxygen
Hydrophobicity
Phenanthroline spectrophotometry
Pyrite
Ultrasonic
Phenanthroline spectrophotometry
Pyrite
Hydrophobicity
Dissolved oxygen
Ultrasonic
Online AccessGet full text
ISSN0892-6875
DOI10.1016/j.mineng.2025.109661

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Abstract [Display omitted] •Ultrasonic-generated Fe ions and suspended substances reduce pyrite hydrophobicity.•Fe2+ oxidation to Fe3+ via dissolved oxygen consumption enhances pyrite oxidation.•Suspended substances outcompete pyrite in sodium butyl xanthate adsorption.•The hydrophobicity of pyrite is poor in ultrasonic pulp but remains good in clean pulp.•The phenomenon of ultrasonic products of pyrite was first proposed and studied. The conventional depression of pyrite via excessive lime addition in flotation systems leads to persistent mineral residues in tailings, while simultaneously hindering timely reactivation for recovery. These residual pyrite-bearing tailings undergo progressive oxidative dissolution when exposed to meteoric water, inducing acid mine drainage generation through sustained proton release. Ultrasonic treatment and its derived products were found to effectively inhibit pyrite, eliminating the requirement for high lime dosages. In this study, pyrite was selected as the research subject to investigate the effects of ultrasonic products on their hydrophobicity—specifically, whether the removal of dissolved Fe2+ and Fe3+ ions and suspended substances in the turbid pulp after ultrasonic treatment affected the hydrophobicity of the pyrite surface. The experimental results indicated that the ultrasonic pulp contained 6.94 × 10-3 mol/L of Fe2+ and 5.42 × 10-3 mol/L of Fe3+, which facilitated the oxidation of pyrite. This process not only increased the proportion of Fe(III) on the pyrite surface but also led to the formation of hydrophilic precipitation of SOn2-, thereby reducing the hydrophobicity of pyrite. Additionally, the suspended substances in the ultrasonic pulp preferentially interacted with the collector, sodium butyl xanthate, hindering its adsorption on the surface of pyrite and exacerbating the reduction in hydrophobicity. Ultrasonic-generated Fe ions and suspended substances reduce pyrite hydrophobicity.
AbstractList [Display omitted] •Ultrasonic-generated Fe ions and suspended substances reduce pyrite hydrophobicity.•Fe2+ oxidation to Fe3+ via dissolved oxygen consumption enhances pyrite oxidation.•Suspended substances outcompete pyrite in sodium butyl xanthate adsorption.•The hydrophobicity of pyrite is poor in ultrasonic pulp but remains good in clean pulp.•The phenomenon of ultrasonic products of pyrite was first proposed and studied. The conventional depression of pyrite via excessive lime addition in flotation systems leads to persistent mineral residues in tailings, while simultaneously hindering timely reactivation for recovery. These residual pyrite-bearing tailings undergo progressive oxidative dissolution when exposed to meteoric water, inducing acid mine drainage generation through sustained proton release. Ultrasonic treatment and its derived products were found to effectively inhibit pyrite, eliminating the requirement for high lime dosages. In this study, pyrite was selected as the research subject to investigate the effects of ultrasonic products on their hydrophobicity—specifically, whether the removal of dissolved Fe2+ and Fe3+ ions and suspended substances in the turbid pulp after ultrasonic treatment affected the hydrophobicity of the pyrite surface. The experimental results indicated that the ultrasonic pulp contained 6.94 × 10-3 mol/L of Fe2+ and 5.42 × 10-3 mol/L of Fe3+, which facilitated the oxidation of pyrite. This process not only increased the proportion of Fe(III) on the pyrite surface but also led to the formation of hydrophilic precipitation of SOn2-, thereby reducing the hydrophobicity of pyrite. Additionally, the suspended substances in the ultrasonic pulp preferentially interacted with the collector, sodium butyl xanthate, hindering its adsorption on the surface of pyrite and exacerbating the reduction in hydrophobicity. Ultrasonic-generated Fe ions and suspended substances reduce pyrite hydrophobicity.
ArticleNumber 109661
Author Sun, Wei
Xie, Jie
Lin, Qiqiang
Cao, Yang
Gao, Zhiyong
Xiang, Meitao
Sun, Lei
Guo, Yuanhao
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  fullname: Lin, Qiqiang
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  givenname: Lei
  surname: Sun
  fullname: Sun, Lei
  email: sunlei@csu.edu.cn
  organization: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
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  givenname: Yang
  surname: Cao
  fullname: Cao, Yang
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  givenname: Jie
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  organization: Jinchuan Group Co.,Ltd, Jinchang 737100, China
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  surname: Sun
  fullname: Sun, Wei
  organization: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
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Keywords Phenanthroline spectrophotometry
Pyrite
Hydrophobicity
Dissolved oxygen
Ultrasonic
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Snippet [Display omitted] •Ultrasonic-generated Fe ions and suspended substances reduce pyrite hydrophobicity.•Fe2+ oxidation to Fe3+ via dissolved oxygen consumption...
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StartPage 109661
SubjectTerms Dissolved oxygen
Hydrophobicity
Phenanthroline spectrophotometry
Pyrite
Ultrasonic
Title Effect of ultrasonic treatment on the surface hydrophobicity of pyrite: Properties and mechanism of ultrasonic products
URI https://dx.doi.org/10.1016/j.mineng.2025.109661
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