Fe3O4+HNO3---Fe(NO3)3+NO+H2O.
Na2Sx(多硫化钠)+NaClO+NaOH---Na2SO4+NaCl+H2O
3Fe3O4+28HNO3---9Fe(NO3)3+NO+14H2O
Na2Sx(多硫化钠)+(3x-1)NaClO+(2x-2)NaOH---xNa2SO4+(3x-1)NaCl+(x-1)H2O