EP 1337471 A2 20030827 - TREATMENT OF NICKEL-CONTAINING WASTE WATER ON PHOSPHATING
Title (en)
TREATMENT OF NICKEL-CONTAINING WASTE WATER ON PHOSPHATING
Title (de)
AUFBEREITUNG VON NICKELHALTIGEM ABWASSER BEI DER PHOSPHATIERUNG
Title (fr)
TRAITEMENT D'EAUX RESIDUAIRES RENFERMANT DU NICKEL LORS D'UNE PHOSPHATATION
Publication
Application
Priority
- DE 10056629 A 20001115
- EP 0112814 W 20011106
Abstract (en)
[origin: DE10056629C1] Production of a nickel-containing solution consisting of a phosphating bath overflow and/or rinsing water comprises phosphating using an acidic phosphatizing solution containing 3-50 g/l phosphate ions, 0.2-3 g/l zinc ions, 0.01-2.5 g/l nickel ions and optionally further metal ions and an accelerator. The bath overflow and/or the rinsing water is passed over a weakly acidic ion exchanger after phosphating. The acid groups of the ion exchanger are neutralized to not more than 15 % with alkali metal ions. The nickel-containing aqueous solution has a pH of 2.5-6.0 on charging to the ion exchanger. Preferred Features: The bath overflow and/or the rinsing water is subjected to membrane filtration in the form of ultrafiltration, nanofiltration, reverse osmosis or other filtering process, and the aqueous solution is fed over the ion exchanger after filtering. The weakly acidic ion exchanger binds nickel ions stronger than zinc ions. The ion exchanger supports chelate-forming iminodiacetic acid groups.
IPC 1-7
IPC 8 full level
B01D 61/02 (2006.01); B01D 61/14 (2006.01); B01J 39/04 (2006.01); B01J 39/07 (2017.01); B01J 45/00 (2006.01); B01J 49/00 (2006.01); C02F 1/42 (2006.01); C23C 22/22 (2006.01); C23C 22/86 (2006.01)
CPC (source: EP US)
B01J 39/07 (2016.12 - EP US); B01J 45/00 (2013.01 - EP US); C02F 1/42 (2013.01 - EP US); C23C 22/86 (2013.01 - EP US)
Citation (search report)
See references of WO 0240405A2
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
DE 10056629 C1 20020404; AU 1907702 A 20020527; BR 0115363 A 20030826; CA 2429156 A1 20020523; CN 1498193 A 20040519; EP 1337471 A2 20030827; JP 2004514055 A 20040513; US 2004037765 A1 20040226; WO 0240405 A2 20020523; WO 0240405 A3 20020725
DOCDB simple family (application)
DE 10056629 A 20001115; AU 1907702 A 20011106; BR 0115363 A 20011106; CA 2429156 A 20011106; CN 01818847 A 20011106; EP 0112814 W 20011106; EP 01996515 A 20011106; JP 2002542739 A 20011106; US 41610303 A 20030827