Fe2O3->Fe2(SO4)3->Fe(OH)3->FeCl3->Fe2S3->H2S
Fe2O3+3 H2SO4 = Fe2(SO4)3+3 H2O
Fe2(SO4)3+6 KOH = 2 Fe(OH)3+3 K2SO4
Fe(OH)3 +3 HCl = FeCl3+3 H2O
2 FeCl3+3 H2S = Fe2S3+6 HCl
Fe2S3+3 H2 = 2 Fe+3 H2S
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Fe2O3->Fe2(SO4)3->Fe(OH)3->FeCl3->Fe2S3->H2S
Fe2O3+3 H2SO4 = Fe2(SO4)3+3 H2O
Fe2(SO4)3+6 KOH = 2 Fe(OH)3+3 K2SO4
Fe(OH)3 +3 HCl = FeCl3+3 H2O
2 FeCl3+3 H2S = Fe2S3+6 HCl
Fe2S3+3 H2 = 2 Fe+3 H2S