Review of Sodium Salt Scaling in the Liquid Streams of the Chemical Recovery Cycle of Kraft Pulp Mills, 2008 Engineering, Pulping and Environmental Conference

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Sodium salt scaling is common in black liquor evaporators, smelt dissolving tanks and green liquor lines. Sodium salts that precipitate include burkeite, sodium sulfate dicarbonate, sodium carbonate sulfate, sodium carbonate, sodium oxalate, pirssonite and sodium aluminosilicates. This paper provides an overview to understand when these various sodium salts will precipitate and provides mills with guidelines to avoid scaling problems associated with these salts.