EP 0946765 A1 19991006 - HYDROMETALLURGICAL ZINC RECOVERY PROCESS AND APPARATUS
Title (en)
HYDROMETALLURGICAL ZINC RECOVERY PROCESS AND APPARATUS
Title (de)
HYDROMETALLURGISCHES VERFAHREN UND ANLAGE ZUR WIEDERGEWINNUNG VON ZINK
Title (fr)
PROCEDE ET DISPOSITIF DE RECUPERATION HYDROMETALLURGIQUE DU ZINC
Publication
Application
Priority
- GB 9702023 W 19970725
- GB 9615946 A 19960730
Abstract (en)
[origin: WO9804752A1] There is provided a process for recovering a desired product from a residue and apparatus therefor. The process includes the step of recirculating either a residue formed in one stage of the process to an earlier stage of the process or the solid-waste residue to a later stage of the process. The invention uses these residues as a reagent in the step to which the residue is recirculated and thus reduces the amount of reagents which have to be added to the overall process thus reducing the cost of running the process. The earlier stage of the process is prior to a treatment step where acid is added to lower the pH of the waste being treated. The recirculation of the residue has the advantage for example of reducing the amount of acid required.
IPC 1-7
C22B 3/00; C22B 7/02; C22B 7/04; C22B 19/28; C22B 19/30; C22B 3/02; C22B 3/06; C22B 3/44; C22B 11/00
IPC 8 full level
C22B 3/44 (2006.01); C22B 7/00 (2006.01); C22B 7/04 (2006.01); C22B 19/28 (2006.01); C22B 19/30 (2006.01); C22B 19/34 (2006.01)
CPC (source: EP)
C22B 3/44 (2013.01); C22B 7/006 (2013.01); C22B 7/007 (2013.01); C22B 7/04 (2013.01); C22B 19/28 (2013.01); C22B 19/30 (2013.01); C22B 19/34 (2013.01); Y02P 10/20 (2015.11)
Citation (search report)
See references of WO 9804752A1
Designated contracting state (EPC)
DE ES FR GB GR IT
DOCDB simple family (publication)
WO 9804752 A1 19980205; AU 3701197 A 19980220; EP 0946765 A1 19991006; GB 9615946 D0 19960911; ZA 976788 B 19980211
DOCDB simple family (application)
GB 9702023 W 19970725; AU 3701197 A 19970725; EP 97933768 A 19970725; GB 9615946 A 19960730; ZA 976788 A 19970730