Method for aluminum reduction in recycled pulp and paper

Details Method for aluminum reduction in recycled pulp and paper Method for aluminum reduction in recycled pulp and paper

D - Textiles, Paper

21

C

D21C 5/02 (2006.01)

Patent

CA 2186321

This invention relates to recently developed systems which produced bleached recycled fibers from high lignin content recovered paper materials such as old corrugated containers and old newspapers. Such systems of this type, generally, use chemical digestion (e.g., the kraft process) to reduce the lignin content prior to bleaching. Since recovered paper materials normally have high levels of aluminum, which are derived from the paper sizing and pH control chemical, aluminum sulfate; and since soluble aluminum causes scaling of evaporators in the kraft digestion-chemical recovery cycle, there is a need for a means to remove soluble aluminum from the recovered paper materials prior to digestion.

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