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- W2119252669 abstract "Abstract The present research evaluated lanthanide desorption levels from ion-adsorption clays subjected to thermal pre-treatment at various temperatures in the range 100–900 °C. The authors identified macro- and micro-structural changes occurring in the clays during heating and related the observed trends to the water content and rare earth elements (REE) desorption behavior during subsequent ion exchange leaching, in order to gain a better understanding of how temperature and moisture may affect the overall REE recovery, hence impacting the ore processing route. It was found that the total lanthanide extraction from clays pre-heated in the range 100–300 °C increased with the temperature, then decreased drastically, reaching near-zero levels for the range 700–900 °C. This trend was explained in terms of improved clay permeability achieved upon elimination of pore and adsorbed water molecules in the interval 100–300 °C, which facilitated better lixiviant access to the REE adsorption sites. The subsequent decrease in REE extraction in the interval 300–900 °C was related to the loss of hydroxyl groups from the aluminosilicate matrix (dehydroxylation), resulting in irreversible REE fixation to the surface and major structural changes such as layer collapse, loss of crystal structure and vitrification, with the ultimate result of completely blocking lixiviant access to the adsorbed cations." @default.
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- W2119252669 date "2015-12-01" @default.
- W2119252669 modified "2023-10-16" @default.
- W2119252669 title "Effects of thermal pre-treatment and ore dryness on the recovery of lanthanides from ion-adsorption clays" @default.
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- W2119252669 doi "https://doi.org/10.1016/j.hydromet.2015.10.029" @default.
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