Abstract
Oxalate is a major source of scaling during the manufacturing process of bleached mechanical pulps and the majority is formed during the peroxide bleaching stage. In this paper, we investigated the effect of using Mg(OH)2 as an alkali source during peroxide bleaching on the formation of oxalate and its partition between soluble and precipitated oxalates. We found that at the same brightness target, the total amount of oxalate formed is similar between the Mg(OH)2‐based peroxide system and the conventional NaOH‐based system, however, almost all of the newly formed oxalate from the former was found in the soluble state, while in the NaOH‐based peroxide process, a large fraction is in the precipitate form. Therefore, the oxalate‐related scaling is significantly less or even negligible during the Mg(OH)2‐based peroxide process. The underlying mechanism accounting for the above observation will be discussed.
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