Treatment of melt in a recovery boiler

Details Treatment of melt in a recovery boiler Treatment of melt in a recovery boiler

D - Textiles, Paper

21

C

D21C 11/06 (2006.01) D21C 11/00 (2006.01) D21C 11/12 (2006.01)

Patent

CA 2078958

ABSTRACT OF THE DISCLOSURE The sulphur content and/or the sulphur compound composition of a melt in a recovery boiler of a pulp mill is adjusted by bringing a gas into contact with the melt. The gas may be a gaseous sulphur compound or a reducing gas. Bringing the gas into contact with the melt increases the sodium sulphide content of the melt while decreasing the sodium carbonate content, so that the sulphidity of the melt increases. The sulphur-containing gas may be produced by pressure heat treatment of black liquor, so that the black liquor burned in the recovery boiler has a lower sulphur content and thereby reduces the boiler sulphur emissions, and boiler corrosion problems.

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