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Chemical Process In Kiln And Mill

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The white liquor NaOH and Na2S from the clarifier is recycled to the digesters in the pulping area of the mill. At about 7 percent of kraft mills, neutral sulfite semi-chemical NSSC pulping is also practiced. The NSSC process involves pulping wood chips in a solution of sodium sulfite and sodium bicarbonate, followed by mechanical de-fibrating.

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