EP 0465822 B1 19940817 - Recovery of sodium hydroxide and aluminium hydroxide from etching waste.
Title (en)
Recovery of sodium hydroxide and aluminium hydroxide from etching waste.
Title (de)
Zurückgewinnung von Natriumhydroxid und Aluminiumhydroxid aus Ätzabfall.
Title (fr)
Récupération de soude et de l'hydroxyde d'aluminium à partir de solutions de décapage usées.
Publication
Application
Priority
US 54939690 A 19900706
Abstract (en)
[origin: EP0465822A1] A method for the recovery and recycling of sodium hydroxide from the waste solution of aluminum etching operations. The method utilizes a dialysis membrane column or stack to initially remove sodium hydroxide from the waste solution and return it to the etch tank base solution sufficiently concentrated to carry on the basic etching operation. The method permits the recovery of salable quantities of aluminum hydroxide.
IPC 1-7
IPC 8 full level
B01D 61/26 (2006.01); B01D 61/32 (2006.01); C01D 1/38 (2006.01); C02F 1/14 (2006.01); C02F 1/20 (2006.01); C02F 1/44 (2006.01); C23F 1/46 (2006.01)
CPC (source: EP)
C23F 1/46 (2013.01)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0465822 A1 19920115; EP 0465822 B1 19940817; AT E110123 T1 19940915; AU 634661 B2 19930225; AU 7948091 A 19920109; CA 2043717 A1 19920107; DE 69103486 D1 19940922; DE 69103486 T2 19941208; ES 2057668 T3 19941016; JP H05115871 A 19930514; MX 9100096 A 19920228
DOCDB simple family (application)
EP 91109027 A 19910603; AT 91109027 T 19910603; AU 7948091 A 19910701; CA 2043717 A 19910531; DE 69103486 T 19910603; ES 91109027 T 19910603; JP 14374591 A 19910617; MX 9100096 A 19910705