FOERFARANDE FOER REGLERING AV KAUSTICERINGSGRADEN VID FRAMSTAELLNING AV VITLUT JAEMTE ANORDNING FOER UTFOERANDE AV FOERFARANDET

摘要

Process is provided for controlling the degree of causticization of white liquor in its preparation from green liquor by the addition of calcium oxide, which comprises determining the sodium carbonate concentration of green liquor fed to the causticization; determining the sodium carbonate concentration of white liquor resulting from the causticization; and controlling the degree of causticization within a predetermined range while taking both sodium carbonate concentrations into account, so as to maintain the degree of causticization of the white liquor within the range despite variations in sodium carbonate concentration of the green liquor and variations in calcium oxide content of the calcium oxide added for causticization.