Sánchez-Palencia, YolandaBolonio, DavidOrtega, Marcelo F.García-Martínez, María JesúsOrtiz, José EugenioRayo, FernandoArregui García-Rovés, LucíaSerrano Barrero, Susana LourdesLlamas, Juan F.Canoira, Laureano2024-09-172024-09-172022Sánchez-Palencia, Yolanda, et al. «Iron Removal from Kaolin Waste Dumps by Chemical (Oxalic and Citric Acids) and Biological ( Bacillus Strain) Leaching». Clays and Clay Minerals, vol. 70, n.o 3, junio de 2022, pp. 386-404. DOI.org (Crossref), https://doi.org/10.1007/s42860-022-00192-7.0009-860410.1007/s42860-022-00192-7https://hdl.handle.net/20.500.14352/108194Acuerdo CRUE-CSIC con Springer Nature (2022)Kaolin waste dumps contain a huge volume of material that cannot be commercialized due to the presence of variable amounts of iron minerals, which impart a yellowish color to the kaolin. Elimination of iron from kaolin using either a chemical or a biological method was the aim of this study. The chemical leaching of iron from kaolin was carried out using response surface methodology to optimize the reaction conditions. Time was found to be the most influential variable, although oxalic acid must be present to leach 32% of the iron. Biological leaching was also assayed for 14 days using a Bacillus strain. The results of bacterial leaching of iron from kaolin showed <1% iron elimination.engAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/journal article1552-8367https://doi.org/10.1007/s42860-022-00192-7https://www.cambridge.org/core/journals/clays-and-clay-minerals/article/iron-removal-from-kaolin-waste-dumps-by-chemical-oxalic-and-citric-acids-and-biological-bacillus-strain-leaching/DD11AE9D2639F4139C6F408CAC4D1B45#open access579.66577679.861546.72BacillusIron leachingKaolin wasteOxalic acidResponse surface methodologyMicrobiología (Biología)Bioquímica (Biología)Mineralogía (Química)2414 Microbiología2403 Bioquímica2506.11 Mineralogía2303 Química Inorgánica