Method for burning secondary sludge in a recovery boiler

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...

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162 3011, 162 31, 162DIG9, 210774, 210928, 159 473, D21C 1100

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active

059763183

ABSTRACT:
A method for burning secondary sludge in a recovery boiler, in which method secondary sludge is mixed with black liquor. According to the method, an alkali is added to the secondary sludge so as to obtain a mixture having a pH of over 7, whereafter the mixture of alkali and secondary sludge is heated to a temperature of over 80.degree. C. and kept at this temperature for over 30 minutes. Thereafter the heat treated mixture of alkali and secondary sludge is supplied to the thick end of a black liquor evaporation plant.

REFERENCES:
Frederick, W.J., "Disposal of . . . Recovery System", TAPPI, vol. 64, No. 1, pp. 59-62, Jan. 1981.
Smook, G.A. "Handbook . . . Tech", Angus Wilde Pub., pp. 133-140, 1992.

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