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Ultrafine Particle Recovery Using Thin Permeable Films.

Daniel J Borrow1, Kim van Netten1, Kevin P Galvin1

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Frontiers in Chemistry
|July 5, 2018
PubMed
Summary
This summary is machine-generated.

A novel water-in-oil emulsion binder enables selective recovery of ultrafine mineral particles (<1 μm). Pre-conditioning particles with emulsifier significantly reduces binder dosage and improves stability, validating predictive models.

Keywords:
agglomerationemulsionhydrophobicpermeable filmstabilizationultrafine particles

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Area of Science:

  • Mineral Processing and Extractive Metallurgy
  • Colloid and Surface Science
  • Materials Science

Background:

  • Selective recovery of ultrafine particles (<10 μm) is a major challenge in the minerals industry, leading to resource under-utilization.
  • Existing methods struggle with particles below 10 micrometers, often resulting in their loss to tailings.
  • Tailings impoundments represent economic losses and environmental concerns due to unrecovered valuable minerals.

Purpose of the Study:

  • To investigate a novel water-in-oil emulsion binder for selective recovery of ultrafine particles down to <1 μm.
  • To evaluate the role of particle conditioning on binder requirements and stability.
  • To validate a predictive model for binder dosage based on hydrophobic surface area.

Main Methods:

  • Utilized a high internal-phase water-in-oil emulsion binder, stabilized by sorbitan monooleate, for particle agglomeration.
  • Employed a model system of magnetite particles (Sauter mean diameter 11.4 μm) for agglomeration experiments.
  • Investigated the effect of pre-conditioning magnetite particles with sorbitan monooleate on binder dosage and stability.

Main Results:

  • The emulsion binder effectively agglomerated ultrafine magnetite particles, enabling recovery rates comparable to larger particles.
  • Initial high binder requirements were attributed to binder degradation by unconditioned magnetite particles.
  • Pre-conditioning magnetite with sorbitan monooleate significantly reduced binder dosage and enhanced binder stability, aligning with model predictions.

Conclusions:

  • The developed water-in-oil emulsion technique offers a promising solution for recovering sub-micron mineral particles.
  • Particle pre-conditioning with emulsifier is crucial for optimizing binder efficiency and stability.
  • The study validates the predictive model for binder dosage, facilitating broader application of this recovery technique.