Kinetics study of iron leaching from Kaolinitic clay using oxalic acid european

The kinetics study of iron leaching from kaolin clay from the Countyof Agua Blanca (Mexico) was carried out using solutions of oxalic acid foriron dissolution. The effects of acid concentration and temperature werestudied to determinate kinetics parameters during iron leaching in oxalic acidmedia. It was found that iron dissolution rate increased with increasing ofconcentration and temperature, respectively. Leaching results showed thatiron dissolution from the kaolin clay could be due to a chemical reactioncontrol. The energy of activation calculated in this work was of 50.32 kJ ?mol-1, for the interval of temperatures from 273 to 333 K; which ischaracteristic of a process controlled by chemical reaction. According to theresults shown above, iron removal is possible, and this can improve theeconomic value for this kind of kaolin clay, being possible its use in theceramic and paper industries as raw material of high quality.