Leaching of iron oxides from kaolin: Synergistic effect of citrate-thiosulfate and kinetic analysis

- Iron dissolution from kaolin, using citric acid and thiosulfate was studied.
- A shrinking particle/core model was developed to describe the iron extraction.
- Increasing temperature boosted the reducing power of the bisulfate in solution.
- Ilmenite, magnetite and greigite were dissolved at distinct reactions rates.
- Iron extraction for these phases was found to be controlled by chemical kinetics.