Petrie van Wyk, Steven Bradshaw
Rare earth elements (REEs) have been identified as valuable and critical raw materials, vital for numerous technologies and applications. With the increasing demand for and supply gap in REEs, many research studies have focused on alternative sources of REEs. This study involved an elemental and mineralogical characterisation of discarded coal from a coal plant and coal fly ash (CFA) from a power station in South Africa for REE presence. XRD results revealed that the discard coal sample consisted mainly of kaolinite, pyrite, siderite, quartz, calcite, gypsum, and muscovite, whereas CFA contained abundant glassy amorphous phases, alumina silicates, quartz, gypsum, calcite, and minute levels of muscovite and hematite. SEM-EDAX showed REE-carrying grains containing phosphorus in both discard coal and CFA samples. This was followed by investigating the leaching potential of REEs using hydrochloric acid from discard coal and CFA. This research’s potential impact is possibly providing a new and sustainable source of REEs. For that purpose, multiple batch leaching tests were performed to investigate the effects of temperature and acid concentration on the leaching efficiencies of REEs from discard coal and CFA.
@article{f59e828c-0596-43e5-b70e-7796e84632db,
title={2024 van Wyk Hydrochloric acid leaching of rare earths from coal ash},
author={Petrie van Wyk and Steven Bradshaw},
year={2026},
language={en}
}TY - JOUR TI - 2024 van Wyk Hydrochloric acid leaching of rare earths from coal ash AU - Petrie van Wyk AU - Steven Bradshaw PY - 2026 LA - en ER -
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