Process and apparatus for recovery of sulfur from a...

Details Process and apparatus for recovery of sulfur from a... Process and apparatus for recovery of sulfur from a...

D - Textiles, Paper

21

C

9/37, 9/36.6

D21C 11/00 (2006.01)

Patent

CA 1053412

ABSTRACT OF THE DISCLOSURE A new chemical recovery process for a poly- sulfide pulping system is described wherein sulfur is recovered from the weak black liquor and is returned to the process, along with makeup sulfur, to recon- stitute the polysulfide solution. After the polysulfide digestion, the spent liquor is contacted with ferric oxide Fe2O3 whereby ferrous sulfide, FeS, is formed. After separation of the ferrous sulfide from the remaining liquid, the ferrous sulfide is oxidized to form elemental sulfur, and ferric oxide. After the melting of the sulfur and the separating of the products, the sulfur can be re- turned to the Sulfur Dissolving Tank wherein, along with makeup sulfur as required, the white liquor from the causticizing plant can be treated to form the polysulfide liquor for digestion. The ferric oxide can by reused for contacting the black liquor to form ferrous sulfide. The resulting smelt of reduced sul- fidity from the recovery furnace can be reprocessed to form the white liquor.

236934

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