Fate of phosphorus in the recovery cycle of the kraft pulping process, TAPPI Journal March 2020



Application: This paper provides mills with an overview of phosphorus (P) in one mill, as well as some new experimental data, to help understand the P distribution in kraft pulp mills. This can be useful for mills evaluating P inputs and purges.

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Author: Maryam Sadegh Mousavi and Nikolai Demartini
Fate of phosphorus in the recovery cycle of the kraft pulpin
ABSTRACT: The accumulation of nonprocess elements in the recovery cycle is a common problem for kraft pulp mills trying to reduce their water closure or to utilize biofuels in their lime kiln. Nonprocess elements such as magnesium (Mg), manganese (Mn), silicon (Si), aluminum (Al), and phosphorus (P) enter the recovery cycle via wood, make-up chemicals, lime rock, biofuels, and process water. The main purge point for these elements is green liquor dregs and lime mud. If not purged, these elements can cause operational problems for the mill. Phosphorus reacts with calcium oxide (CaO) in the lime during slaking; as a result, part of the lime is unavailable for slaking reactions. The first part of this project, through laboratory work, identified rhenanite (NaCa(PO4)) as the form of P in the lime cycle and showed the negative effect of P on the availability of the lime. The second part of this project involved field studies and performing a mass balance for P at a Canadian kraft pulp mill.
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