Abstract
We developed a cost-effective bleaching method for overcoming the brightness ceiling of thermomechanical pulp (TMP) made from mill chips containing predominantly mountain pine beetle-infested lodgepole pine. The method involves synergistic bleaching of the TMP in the refiner with hydrosulfite (Y) and diethylenetriaminepentaacetic acid (DTPA) as the chelating agent. The synergistic, in-refiner Y+DTPA bleaching, when followed by post-refiner Y or peroxide bleaching, can provide higher brightness gain or lower bleaching chemical cost for Y- or peroxide-bleached TMP from the mill chips. Estimated cost savings for Y bleaching to 60.0% ISO brightness and peroxide bleaching to 74.3% ISO brightness are USD 5.2/ton pulp and USD 5.2-6.2/ton pulp, respectively.
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