PRE-TREATMENT OF SULFITE PULP BEFORE BLEACHING WITH OXYGEN CONTAINING CHEMICALS

摘要

This invention relates to the pre-treatment ofsulfite pulp. More particularly, this invention relatesto a novel process for caustic extraction of unbleachedsulfite pulp to reduce metallic impurities in the pulp.The process of reducing metallic impurities in unbleachedsulfite pulp comprises subjecting the pulp to causticextraction.