Zn-ZnS-H2S-S-H2S-SO2
Zn + S = ZnS ZnS + 2HCl = ZnCl₂ + H₂S↑ H₂S + 2HNO₃ = S + 2NO₂↑ + 2H₂O S + H₂ = H₂S↑ 2H₂S + 3O₂ = 2SO₂ + 2H₂O