Search International and National Patent Collections

1. (WO2018125976) ELECTRO-CERAMIC COATING BATH CLEANUP BY A HYBRID ION EXCHANGE PRECIPITATION PROCESS

Pub. No.:    WO/2018/125976    International Application No.:    PCT/US2017/068658
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Fri Dec 29 00:59:59 CET 2017
IPC: C25D 21/18
C25D 21/22
C02F 1/42
Applicants: HENKEL AG & CO. KGAA
KOZAK, William G.
Inventors: KOZAK, William G.
KUHNS, Eric C.
LEPA, Klaus
Title: ELECTRO-CERAMIC COATING BATH CLEANUP BY A HYBRID ION EXCHANGE PRECIPITATION PROCESS
Abstract:
A process and a system for cleaning excess aluminum from coating baths, e.g. anodization bath solutions, so that they can be reused in an effective manner is provided. The process comprises first passing a portion of the anodization bath solution having excess aluminum through a strong acid cation exchange column in a Na+ form, allowing the effluent to age thereby precipitating cryolite from the effluent; removing the precipitated cryolite from the effluent and then passing the effluent through a strong acid cation exchange column in the NH4+ form, in a preferred embodiment back through the first column, to restore NH4+ to the anodization bath solution and then adding the effluent back in to the anodization bath solution.