Y. Ghorbani, A.N. Mainza
The application of comminution technology such as the High-pressure grinding rolls (HPGR), which is able to generate a high density of cracks in the ore particles, is favourable for leaching processes. Extraction of metallic values by the heap leach process can occur on particles with partial exposure of mineral grains if sufficient surface front is available for chemical attack by leaching solution. This study aimed to assess the benefits of high crack density in ore particles produced using HPGR and how inadequate percolation of the leaching agent could diminish these benefits. Zinc ore was comminuted using HPGR and a cone crusher for comparison. Subsamples from specific size fractions were characterized and used in leach reactors. Periodic investigations monitored crack and micro-crack growth effects on metal extraction using X-ray computed tomography (CT), validated by traditional techniques like SEM and QEMSCAN. Results indicated significant changes in particle size distribution (PSD) toward finer sizes, with HPGR leach reactors yielding up to 10.3% more fine particles compared to those fed by cone crusher products. This reflects the integral role of crack density in enhancing leaching efficiency.
@article{6c31c7d7-84f1-46e8-9bf6-9b7dd1f179a1,
title={Investigation of particles with high cra},
author={Y. Ghorbani and A.N. Mainza},
year={2026},
language={en}
}TY - JOUR TI - Investigation of particles with high cra AU - Y. Ghorbani AU - A.N. Mainza PY - 2026 LA - en ER -
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