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Chloride and potassium are known to have a negative impact on the kraft chemical recovery process. This has led to renewed interest in chloride and potassium removal. In addition to purging precipitator dust, there are six processes commercially available for the selective removal of chloride and potassium from the recovery cycle, employing four distinctly different technologies. This review has been prepared to assist pulp mills in evaluating the different technology options available to them, and to provide examples comparing the impact of each process on the kraft liquor cycle. The principles of operation, the advantages and disadvantages, the impact on the liquor cycle and the potential benefits of each process are discussed.
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Chloride and Potassium Removal Processes for Kraft Pulp Mills: A Technical Review, 2004 Internationa