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Location DB > Canada > Ontario > Cornwall > Domtar > Powder House and Lab > yellow stripe.JPG 7 / 23   yellow stripe.JPG Description The "Liquor Lounge" corridor was leading to what we think is the paper whitening building Controls Return to Main Location Page Return to Gallery Overview Edit this Gallery Edit this Picture Subscribe this Picture Comments Posted by Samurai 4/19/2007 8:09 PM | remove   this must be their recaust section Posted by Samurai 4/20/2007 12:03 PM | remove   Paper isn't whitened, per se... it's called a bleaching process... basically your brown pulp (at our mill) goes into one brown stock washer where the black liquor is washed out of it, then on to a 2nd brown stock washer. From there, it goes through a series of screens (hardwood or softwood... they have different screens) and then on to the deckers. From the deckers, the pulp goes to the first tower (#10), where it gets zapped with chlorine dioxide, which starts the bleaching process... the pulp goes into #15 washer, then out to #20 tower where it gets hit with more caustic, then back into 25 washer and then into #30 tower, more ClO2 then 35 washer, out to 40 tower (caustic) 45 washer, 50 tower (this is where our own 'secret sauce' and hydrogen peroxide get added) and then to 55 washer... from 55 washer, the pulp (which is uber bright white now) goes to either #7 or #10 silo (hardwood) or #9 silo (softwood). #8 silo is a swing silo which contains both hardwood and softwood. working in the wet end or back end of a paper mill is just like working in a chemical plant. If you'd like to add a comment, please login or register. All content and images copyright © 2002-2024 UER.CA and respective creators. Graphical Design by Crossfire. To contact webmaster, or click to email with problems or other questions about this site: UER CONTACT View Terms of Service | View Privacy Policy | Server colocation provided by Beanfield This page was generated for you in 406 milliseconds. Since June 23, 2002, a total of 739484757 pages have been generated.