Iron Removal from Kaolin Waste Dumps by Chemical (Oxalic and Citric Acids) and Biological (Bacillus Strain) Leaching

Abstract Kaolin waste dumps contain a huge volume of material that cannot be commercialized due to the presence variable amounts iron minerals, which impart yellowish color kaolin. Elimination from kaolin using either chemical or biological method was aim this study. The leaching carried out response surface methodology optimize reaction conditions. Time found most influential variable, although oxalic acid must present leach 32% iron. Biological also assayed for 14 days Bacillus strain. results bacterial showed <1% elimination.