Title:
【発明の名称】パルプの過酸化物漂白による濾液の処理
Document Type and Number:
Japanese Patent JP2002511535
Kind Code:
A
Abstract:
A method in bleaching of pulp is described, in which the pulp is subjected to a peroxide bleaching step, whereupon the pulp is washed and the washing liquid from the washing is separated from the pulp in the form of a filtrate. The method is characterised in that the filtrate is treated with an aluminium compound, such as aluminium sulphate or polyaluminium sulphate, for precipitation of interfering substances, such as oxygen-demanding organic material and metals, that the precipitated material is removed from the filtrate, that the aluminium content of the filtrate after precipitation of interfering substances is adjusted to at most 20 ppm, and that the filtrate is then recirculated to the peroxide bleaching step. By the method, a reduced consumption of hydrogen peroxide in the peroxide bleaching step is achieved.
Inventors:
Hans, Terelius
Annette, Allson
Margareta, Nilsson
Jessica, Svenson
Christos, Lampotas
Annette, Allson
Margareta, Nilsson
Jessica, Svenson
Christos, Lampotas
Application Number:
JP2000543672A
Publication Date:
April 16, 2002
Filing Date:
April 07, 1999
Export Citation:
Assignee:
KEMIRA KEMI AB
International Classes:
D21C9/10; D21C9/16; D21C11/00; (IPC1-7): D21C9/16; D21C11/00
Attorney, Agent or Firm:
Kazuo Sato (3 others)