A METHOD AND A DEVICE FOR PREPARING CELLULOSE PULP

摘要

A method and an apparatus for preparing cellulose pulp, in which a lignin-containing raw material is impregnated with impregnation liquor and the impregnated raw material is cooked. The black liquor obtained by cooking is concentrated in an evaporation plant (17) integrated in a chemical recovery plant. In the impregnation, the lignin-containing raw material is impregnated with a circulating alkaline impregnating liquor, which impregnating liquor is concentrated by evaporating water from it in at least one evaporator unit (17c) of the evaporation plant (17) arranged in the chemical recovery plant of a pulp mill.