Black liquor

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It has been suggested that this article or section be merged into Kraft process. (Discuss)

Black liquor is a recycled byproduct formed during the Kraft process, the sulfate method of chemical pulping of wood in the papermaking industry. In this process, lignin is separated from cellulose, with the latter forming the paper fibers. Black liquor is the combination of the lignin residue with water and the chemicals used for the extraction.

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