Chloride and potassium removal efficiency of an ash leaching system

Copyright Pulp & Paper Canada. Reprinted with permission from Annex Business Media.Results of an analysis of the operating data of an ash leaching system show that the system removed 90% of the chloride (Cl) and 82% of the potassium (K) introduced to the system with the precipitator ash. The Cl concentration in the ash was significantly lower, compared to that before the ash system installation, while the K concentration remained at about the same level as before, when the mill was purging ash. The dramatic decrease in Cl concentration and the insignificant change in K concentration in the precipitator ash are likely due to the ash leaching system installation and the high sulphidity operation of the mill