Method of bleaching de-inked pulp

Details Method of bleaching de-inked pulp Method of bleaching de-inked pulp

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21C 5/02 (2006.01)

Patent

CA 2093182

Deinked paper pulp is subjected to bleaching with sulfite or bisulfite ions and a reducing agent, preferably sodium bisulfite and sodium borohydride in aqueous alkaline solution. To assist the removal of ink particles, steam is bubbled through the pulp causing the ink particles to rise to the surface as a black foam which can be continuously removed.

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