| 摘要 |
<p>A process for removing S0<Sub>2</Sub> and NO, from waste gas and recovering sulfur comprising scrubbing the waste gases with a water slurry of FeS in the presence of FeSO, and Na<Sub>2</Sub>S0<Sub>4</Sub>- S0<Sub>2</Sub> is captured by the formation of FeS<Sub>2</Sub> and FeSO, in the scrubber. By thermal regeneration in a reducing atmosphere the FeS<Sub>2</Sub> is converted to FeS and Na<Sub>2</Sub>SO<Sub>4</Sub> to Na<Sub>2</Sub>S. The FeS is recycled to the scrubber. The Na<Sub>2</Sub>S is returned to the system reacting with FeSO<Sub>4</Sub> to form Na<Sub>2</Sub>SO<Sub>4</Sub> and FeS. The last reaction reduces the amount of FeSO<Sub>4</Sub>, entering the regenerator where by an undesirable side reaction, it may be partially converted to SO<Sub>2</Sub> and Fe<Sub>3</Sub>O<Sub>4</Sub>.</p> |
