Zeta potential of inorganic fine particle—Na-bentonite binder mixture systems

Akira Otsuki, Neil Lonio Hayagan

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The zeta potential of single and multi-inorganic fine particle mixtures (hematite and gangues, i.e., SiO2 + Al2O3) with Na-bentonite was investigated to understand and properly control the mineral surface properties relevant to pelletization of low-grade fine iron ores. The zeta potential of hematite-bentonite mixture showed more negative charge up to 1 wt.% bentonite dosage and became constant. In the multiparticle mixture systems with bentonite, the SiO2 amount in the system controlled the changes in zeta potential due to its high negative charge (−54.9 mV at natural pH) and the bentonite attachment on its surface based on the electrostatic interaction while Al2O3 had no effect due to its negligible surface charge (−1.6 mV at natural pH). This article reports the new insight into the characterization of surface chemistry of inorganic/mineral mixture systems to understand their surface charge properties in relation to fine mineral particle processing, and to show a direction toward the elucidation of particle dispersion/aggregation mechanism in complex ore systems aiming for their beneficiations.

Original languageEnglish
Pages (from-to)1405-1412
Number of pages8
Issue number16-17
StatePublished - 1 Sep 2020
Externally publishedYes


  • DLVO theory
  • Electrostatic interaction
  • Heterocoagulation
  • Low-grade ore
  • Surface charge


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