A METHOD FOR THE PRODUCTION OF GREEN LIQUOR

摘要

The present invention concerns a method for production of green liquor in association with a causticizing process during recovery of chemicals in manufacture of sulphate pulp comprising: a) a first step of a smelt (14) of chemicals principally consisting of Na2S and Na2CO3 from a soda boiler (1), b) a second step of a weak liquor (15) that contains dissolved NaOH and CaO, and of c) a third step of a dissolving tank (2) in which the smelt (14) from the soda boiler (1) is dissolved in the weak liquor (15) in order to form a green liquor (16), whereby a solution of NaOH is added to the weak liquor (15) at a position before said weak liquor (15) is added to the dissolving tank, in order in this way to increase the concentration of NaOH in the weak liquor (15) such that a fraction of CaO that is present dissolved in the weak liquor (15) precipitates.