EP 0693144 A1 19960124 - METHOD OF TREATING PROCESS WATER
Title (en)
METHOD OF TREATING PROCESS WATER
Title (de)
VERFAHREN ZUR BEHANDLUNG VON WASSER BENUTZT BEI DER FERTIGUNG
Title (fr)
PROCEDE D'EPURATION D'EAU DE TRAITEMENT
Publication
Application
Priority
- SE 9400130 W 19940217
- SE 9301161 A 19930407
Abstract (en)
[origin: WO9423122A1] A method of treating process water containing metal ions in connection with bleaching pulp of ligno-cellulose-containing material. The process water is brought into contact with an alkaline liquid, which preferably also contains sulphide, whereby metal ions precipitate in the form of difficultly soluble metal compounds. The precipitated metal compounds thereafter are separated from the process water.
IPC 1-7
IPC 8 full level
C02F 1/64 (2006.01); D21C 9/10 (2006.01); D21C 11/00 (2006.01)
CPC (source: EP)
D21C 9/1005 (2013.01); D21C 9/1026 (2013.01); D21C 11/0028 (2013.01)
Citation (search report)
See references of WO 9423122A1
Designated contracting state (EPC)
AT DE ES FR PT SE
DOCDB simple family (publication)
WO 9423122 A1 19941013; AU 6387694 A 19941024; AU 672501 B2 19961003; BR 9406105 A 19951212; CA 2160123 A1 19941013; CN 1120358 A 19960410; EP 0693144 A1 19960124; FI 954766 A0 19951006; FI 954766 A 19951006; JP H08508546 A 19960910; NO 953993 D0 19951006; NO 953993 L 19951006; NZ 263264 A 19960827; SE 9301161 D0 19930407; SE 9301161 L 19941008; ZA 941235 B 19940920
DOCDB simple family (application)
SE 9400130 W 19940217; AU 6387694 A 19940217; BR 9406105 A 19940217; CA 2160123 A 19940217; CN 94191676 A 19940217; EP 94911328 A 19940217; FI 954766 A 19951006; JP 52196994 A 19940217; NO 953993 A 19951006; NZ 26326494 A 19940217; SE 9301161 A 19930407; ZA 941235 A 19940223