In this test which is based on the basic aluminum sulfate desorption desulfurization method

the influence of Fe~(2+)

Fe~(3+)and Mn~(2+)on catalytic oxidation of S(Ⅳ)and SO_2 desorption rate was investigated.The results show that

when the concentration of Fe~(2+)

Fe~(3+)or Mn~(2+)in the solution was higher than0.06mol/L

0.04mol/L or 0.02mol/L respectively

the S(Ⅳ)would be oxidized catalytically into S(Ⅵ)

and the higher the ions concentration

the more dramatic the catalytic oxidation effects would be.Thus

the desorption rate of SO_2 would be decreased.Therefore

if the concentration of Fe~(2+)

Fe~(3+)and Mn~(2+)can be controlled within the above range respectively

the catalytic oxidation would be totally suppressed.