Turkey is very rich in clay deposits. The primary reason for this is that the geological structure of Turkey has a highly faulted and fractured tectonic structure. Hydrothermal solutions with different chemical compositions rising along the fractured crack surfaces along the fault zones cause alteration in the host rocks with which they interact and cause the formation of clay minerals as secondary minerals. Many of these hydrothermal clay formations have been identified geologically and chemically and their chemical compositions have been revealed by researchers.
In addition with the increase in the need for rare earth elements (REE) with the advancing technology around the world, the REE contents of clays and the extraction and techniques of REE from these materials have begun to be investigated. In this study, it was theoretically investigated that REE adsorbed on the clays of three different regions in Turkey can be recovered by ion exchange technique during extraction with monovalent salt solutions. Bursa/Orhaneli (smectite), Giresun/Tirebolu (smectite) and Çanakkale/Yenice (halloysite) clay deposits as a region were preferred because the studies conducted in the region contain detailed data. The REE contents of these quarries are 98 ppm, 175 ppm and 237 ppm, respectively (Erkoyun et al., 2022; Arslan et al., 2010; Ece et al., 2008). With the theoretical calculations, it was determined that the extraction efficiency changes according to the cation source used, and it was calculated that the yield would be between 90% and 60%, and as a result, it was calculated that maximum 88.2 ppm, 157.5 ppm and 213.3 ppm.
Anahtar Kelimeler: Alteration, Clay, Rare Earth Element, Extraction
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