Title:
【発明の名称】プロセス水の処理方法
Document Type and Number:
Japanese Patent JP2002506134
Kind Code:
A
Abstract:
A method treats process water containing metal ions, in connection with bleaching of lignocellulosic pulp. The method is characterized by the steps of a) adjusting the Mg2+ content of the process water to form a flocculating base for metals and an organic substance; b) supplying a carbonate source to the process water to precipiate calcium as calcium carbonate; c) increasing the pH of the process water by adding white liquor to precipipate metals such as metal hydroxides; d) adding a flocculating agent to the process water; and e) separating the precipitated, flocculated metal compounds from the process water by flotation.
More Like This:
| WO/1987/007314 | PROCEDURE FOR PREBLEACHING CHEMICAL CELLULOSE PULPS |
| WO/1995/012029 | AMINOALKANE DIPHOSPHONIC ACIDS IN PULP BLEACHING |
| WO/1995/029997 | USE OF A THERMOSTABLE ENZYME AS A FEED ADDITIVE |
Inventors:
Christos, Lampotas
Viveka, Svenson
Johnny Hanson
Margareta, Nilsson
Viveka, Svenson
Johnny Hanson
Margareta, Nilsson
Application Number:
JP2000534718A
Publication Date:
February 26, 2002
Filing Date:
January 18, 1999
Export Citation:
Assignee:
KEMIRA KEMI AB
International Classes:
D21C9/10; C02F9/04; D21C11/00; C02F1/24; C02F1/52; C02F1/54; C02F101/20; C02F103/28; (IPC1-7): D21C9/10; D21C11/00
Attorney, Agent or Firm:
Kazuo Sato (3 others)