Research demonstrates spectral induced polarisation identifies metal inclusions in porous sand, highlighting potential for rare earth recovery.
The growing global demand of rare earth materials and efficient metal recovery techniques from natural resources highlight the significance of advanced methods for identifying and characterising metallic mineral in complex porous matrix. The study aims to characterise metal particles captured in a porous sand matrix using Spectral Induced Polarisation (SIP) method, mainly focusing on the sensitivity of SIP to variations in metal content. An experimental setup was designed to perform SIP measurements on pyrite-sand mixtures, specifically aimed at capturing the complex conductivity of the samples. This setup incorporated a custom-designed cup equipped with four embedded electrodes, facilitating four-point impedance measurements essential for analysing complex conductivity responses. Experiments were performed on sand, mixed with 3 distinct pyrite concentrations. All the measurements were performed three times to comment on the measurement variability. The SIP responses were found to vary with the concentration of pyrite particles. The results suggest that SIP is a promising method for identifying and measuring metal inclusions in porous geological materials.
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Mandloi et al. (2025) studied this question.
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