11 Na₂O₂ + 2 FeS₂ → 7 Na₂O + Fe₂O₃ + 4 Na₂SO₃

This is an oxidation-reduction (redox) reaction:

FeS₂ is a reducing agent, Na₂O₂ is an oxidizing agent, FeS₂ is a reducing agent.

Reactants:

• Na₂O₂
  • Names: Sodium peroxide , Disodium dioxide , Flocool ... show moreSolozone , Disodium peroxide , Sodium dioxide , Sodium superoxide show less
  • Appearance: Yellow to white powder ; Yellow-to-white powder
• FeS₂
  • Names: Ferrous disulfide , Fool's gold , Iron disulfide ... show moreIron persulfide , FeS2 show less

Products:

• Na₂O – Sodium oxide
  • Other names: Disodium oxide , Sodium monoxide , Disodium monoxide
  • Appearance: White solid ; White lumps or powder
• Fe₂O₃ – Iron(III) oxide
  • Other names: Ferric oxide , Hematite , Ferric iron ... show moreRed iron oxide , Rouge , Maghemite , Colcothar , Iron sesquioxide , Rust , Ochre , Iron oxide dust and fume (as Fe) , Iron oxide red , Red oxide , Anhydrous ferric oxide , Iron (III) oxide , Diiron trioxide , Iron trioxide , Ferric sesquioxide , Iron(III) oxide [Iron oxide dust and fume (as Fe)] , Iron(III)oxide [Rouge] show less
  • 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.]
• Na₂SO₃ – Sodium sulfite
  • Other names: Sodium sulphite , Hypo clear (photography) , E221 ... show moreNa2SO3 , Anhydrous sodium sulfite , Sodium sulfite anhydrous , Sulfurous acid, disodium salt , Dried sodium sulfite , Disodium sulfite show less
  • Appearance: White solid ; White crystals or powder