Förfarande för att fälla magnesium med aluminium vid grönlutsklarning

摘要

The invention relates to a method for improving the filterability of the green liquor in the kraft pulp process by means of adding aluminium in the form of elemental aluminium or an aluminium-containing chemical compound to the process in a quantity such that the major part of the magnesium content of the green liquor is precipitated out together with aluminium in the form of hydrotalcite.