16 Fe2O3 + FeS2 → 2 SO2 + 11 Fe3O4
This is an oxidation-reduction (redox) reaction:
2 S-I - 10 e- → 2 SIV (oxidation)
FeII - 2/3 e- → Fe8/3 (oxidation)
32 FeIII + 32/3 e- → 32 Fe8/3 (reduction)
FeS2 is a reducing agent, FeS2 is a reducing agent, Fe2O3 is an oxidizing agent.
Reactants:
- Fe2O3 – Iron(III) oxide
- Other names: Ferric oxide , Hematite , Ferric iron
- Appearance: Red-brown solid ; Reddish brown-to-black crystals or powder ; Reddish-brown solid. [Note: Exposure to fume may occur during the arc-welding of iron.] ; A fine, red powder of ferric oxide. [Note: Usually used in cake form or impregnated in paper or cloth.]
- FeS2
Products:
- SO2 – Sulfur dioxide
- Other names: Sulfurous anhydride , Sulphur dioxide , Sulfurous acid anhydride
- Appearance: Colorless gas ; Colourless gas or compressed liquefied gas with pungent odour ; Colorless gas with a characteristic, irritating, pungent odor. [Note: A liquid below 14°F. Shipped as a liquefied compressed gas.]
- Fe3O4 – Iron(II) iron(III) oxide