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April 26, 2026Minerals Engineering0 citationsOpen Access

Tailored Oxidised Starch Derivatives Enhance Pyrrhotite Depression in Flotation

Tailored oxidised starch derivatives for enhanced selectivity of pyrrhotite depression in gold-copper flotation

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Authors

FRFoad RajiARAlireza RezvaniRLRichard Li Jie Lee

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Overview

Randomized trial demonstrates selective pyrrhotite depression using tailored oxidised starch in flotation, indicating a sustainable solution for complex sulphide ores.

Key Points

  • To evaluate the effectiveness of oxidised starch derivatives as selective depressants for pyrrhotite in gold-copper flotation.
  • Native wheat starch was oxidised using NaClO or H2O2 to produce functional derivatives.
  • Flotation tests measured the effectiveness of each derivative in depressing pyrrhotite recovery.
  • Synchrotron-XRD and DFT analyses assessed the relationship between functional groups and flotation performance.
  • Total pyrrhotite recovery significantly decreased from 39.6% (baseline) to 10.7% (NaClO-OS).
  • NaClO-OS consistently outperformed H2O2-OS, demonstrating stronger binding due to carboxyl groups.
  • Depressant performance was dictated by functional group chemistry rather than pyrrhotite crystallography.

Cite This Study

Raji et al. (2026) studied this question.

synapsesocial.com/papers/69edab424a46254e215b3501https://doi.org/10.1016/j.mineng.2026.110316
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