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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.
Molecules (Basel, Switzerland)
|April 28, 2023
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.
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.
