A method of processing recycled cellulosic textile waste material containing colouring substance to obtained decolourized material

Abstract

Method of processing cellulosic waste material, decolourized cellulosic pulp and the use thereof. The method comprises providing cellulosic waste material containing colouring substances, such as colour pigments, dyes, colourants and combinations thereof, pulping the waste material to produce cellulosic pulp, and decolourizing the pulp with ozone under alkaline conditions. By subjecting recycled textile waste materials, after pulping, to an ozone treatment carried out in the alkaline range excellent whiteness of the pulp is reached, without significantly impairing the viscosity of the pulp.