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A pulp mill digester is a pressure vessel used in the pulping process to break down wood chips into cellulose fibers. It operates by cooking the wood chips in a chemical solution, typically consisting of sodium hydroxide and sodium sulfide, at high temperatures and pressures. This process, known as alkaline pulping or kraft pulping, removes lignin and other non-cellulosic components, transforming the wood into a slurry of cellulose fibers. After digestion, the mixture is processed further to separate the fibers from the spent liquor for subsequent washing and bleaching.

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