Purification of coal fly ash leach liquor by solvent extraction: Identification of influential factors using Design of Experiments

The maximum iron extraction achieved in the implemented design was 33.8% while 99% of titanium could be extracted from the coal fly ash leach solution. Extraction improvement tests showed that at a hydrogen ion concentration of 0.28 M, 88% iron and 99% titanium extraction from coal-fly ash leach solution could be achieved.