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Experimental and Simulation Studies on Hematite Interaction with Na-Metasilicate Pentahydrate.

Gonzalo R Quezada1, Norman Toro2, R S Krishna3

  • 1Escuela de Ingeniería Química, Facultad de Ingeniería, Universidad del Bío-Bío, Concepción 4081112, Chile.

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|April 28, 2023
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Summary

Sodium metasilicate reduces iron ore slurry yield stress, lowering pumping energy costs. This sustainable solution enhances iron ore processing by improving particle dispersion and reducing pollution from mining.

Keywords:
hematiteinteraction mechanismsmolecular dynamicsrheologysodium metasilicate

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Mining Engineering

Background:

  • Iron ore processing faces environmental challenges due to pollution and decreasing ore concentration.
  • Sustainable solutions like reprocessing and reusing iron ore sources are crucial for the industry.

Purpose of the Study:

  • To investigate the rheological effects of sodium metasilicate on concentrated iron ore pulps.
  • To understand the molecular mechanisms of sodium metasilicate adsorption on hematite surfaces.

Main Methods:

  • Rheological analysis using an Anton Paar MCR 102 rheometer.
  • Computational simulations including quantum calculations and molecular dynamics.
  • Modeling of adsorption behavior using the Slips model.

Main Results:

  • Sodium metasilicate significantly reduces slurry yield stress, indicating lower energy requirements for pumping.
  • Adsorption of sodium metasilicate on hematite is stable and concentration-dependent, forming cation and hydrogen bridges.
  • Adsorbed sodium metasilicate increases surface charge, leading to particle dispersion and reduced rheology.

Conclusions:

  • Sodium metasilicate offers a sustainable approach to improve iron ore processing efficiency.
  • The findings provide insights into the interaction of additives with mineral surfaces for industrial applications.
  • Reduced rheology and energy consumption contribute to more environmentally friendly iron ore transportation.