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Extraction of rare earth elements from a South American ionic clay

Journal of Rare Earths 2023年第9期41卷 1408-1418,I0005页

作者： John Anawati Gisele Azimi Laboratory for Strategic Materials Department of Chemical Engineering and Applied ChemistryUniversity of Toronto200 College StreetTorontoOntarioM5S3E5Canada Department of Materials Science and Engineering University of Toronto184 College StreetTorontoOntarioM5S 3E4Canada

ionic clays,formed by the natural weathering of REE-bearing minerals and the adsorption of the resulting liberated REE ions onto the clay surface,are an important resource for critical rare earth elements(REEs).Here,a two-step desorption process using ammonium sulfate with active pH adjustment using sulfuric acid was developed to extract REEs from a South American *** desorption process was optimized using response surface methodology approach and the optimum operating conditions were determined to be 0.15 mol/L ammonium sulfate,pH 3,liquid to solid ratio of 3/1,and 25℃ with20 min residence *** is shown that this ionic clay is significantly different from previously reported clays,e.g.,from southern China,as it consists of three modes of REEs,including ion-exchanged REEs physically adsorbed on the clay surface,hydrolyzed REEs chemically adsorbed on the clay surface,and mineralized(non-desorbable) REEs within the *** investigations through progressive acidification during desorption and adsorption isotherms show that REE desorption/adsorption occurs due to the combined action of physical ion exchange adsorption and surface complexation chemical adsorption,with their relative importance depending on the pH of the system and the amount of sulfate anions present within the *** work supports overall efforts to utilize ionic clays as a relatively new resource for REEs to empower the development and adoption of modern green technologies such as wind turbines and electric vehicles.

关键词： ionic clay ion-exchange desorption Surface complexation Ammonium sulfate leaching Rare earths

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