Effects of Dissolved Organic Carry-Over on Pulp Bound Metals When Closing the Bleach Plant, 1996 Pulping Conference Proceedings

Patrick S. Bryant

Chemicals AB

Louis L. Edwards

University of Idaho

Mill and laboratory studies indicate that carry-over or carry-back of dissolved solids into the acid wash (A) or acid chelation (Q) stage improves manganese removal from pulp. This improvement in manganese removal may be a result of ion exchange with sodium and a poorly understood reaction between dissolved organics and cations that occurs under acidic conditions. It appears that under acidic conditions, dissolved organics irreversibly bind to metal cations forming a colloidal suspension. This irreversible reaction reduces the amount of free dissolved cations that can participate in ion exchange with the pulp fibers.

Effects of Dissolved Organic Carry-Over on Pulp Bound Metals
Effects of Dissolved Organic Carry-Over on Pulp Bound Metals When Closing the Bleach Plant, 1996 Pulping Conference Proceedings
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