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1. WO1996002689 - PROCESS FOR ELECTROCHEMICALLY DISSOLVING A METAL SUCH AS ZINC OR TIN

Publication Number WO/1996/002689
Publication Date 01.02.1996
International Application No. PCT/EP1995/002838
International Filing Date 19.07.1995
Chapter 2 Demand Filed 10.01.1996
IPC
C22B 3/04 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
3Extraction of metal compounds from ores or concentrates by wet processes
04by leaching
C22B 7/00 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
7Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof
C22B 19/30 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
19Obtaining zinc or zinc oxide
30from metallic residues or scraps
C22B 25/06 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
25Obtaining tin
06from scrap, especially tin scrap
C25F 5/00 2006.01
CCHEMISTRY; METALLURGY
25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
FPROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
5Electrolytic stripping of metallic layers or coatings
CPC
C22B 19/30
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
19Obtaining zinc or zinc oxide
30from metallic residues or scraps
C22B 25/06
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
25Obtaining tin
06from scrap, especially tin scrap
C22B 3/045
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
3Extraction of metal compounds from ores or concentrates by wet processes
04by leaching
045Leaching using electrochemical processes
C22B 7/006
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
7Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; ; Methods of a general interest or applied to the winning of more than two metals
006Wet processes
C25F 5/00
CCHEMISTRY; METALLURGY
25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
FPROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
5Electrolytic stripping of metallic layers or coatings
Y02P 10/228
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
10Technologies related to metal processing
20Process efficiency
21by recovering materials
212Recovering metals from waste
214by pyro metallurgy
228of Sn
Applicants
  • HOOGOVENS STAAL B.V. [NL/NL]; P.O. Box 10.000 NL-1970 CA IJmuiden, NL (AllExceptUS)
  • MOOIJ, Joop, Nicolaas [NL/NL]; NL (UsOnly)
  • WIJENBERG, Jacques, Hubert, Olga, Joseph [NL/NL]; NL (UsOnly)
Inventors
  • MOOIJ, Joop, Nicolaas; NL
  • WIJENBERG, Jacques, Hubert, Olga, Joseph; NL
Agents
  • HANSEN, Willem, Joseph, Maria; Hoogovens Corporate Services B.V. P.O. Box 10.000 NL-1970 CA IJmuiden, NL
Priority Data
94202103.119.07.1994EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) PROCESS FOR ELECTROCHEMICALLY DISSOLVING A METAL SUCH AS ZINC OR TIN
(FR) PROCEDE POUR LA DISSOLUTION ELECTROCHIMIQUE D'UN METAL TEL QUE LE ZINC OU L'ETAIN
Abstract
(EN)
The object of the invention is to provide for an improved electrochemical dissolution process for electrochemically dissolving a first metal by simultaneously creating hydrogen evolution at a second metal, the second metal being a metal that has a larger current exchange density for hydrogen evolution than the first metal, both metals being immersed in an aqueous electrolyte system, wherein the first metal and the second metal are galvanically coupled. By taking measures to reduce inhibition of said hydrogen evolution at said second metal the rate of dissolution of the first metal is enhanced. The measures to reduce said inhibition comprise suitably selecting temperatures and concentrations of the electrolyte, dividing the electrolyte into two fluids coupled by a selectively permeable device and suitably selecting the resistance value of a connecting means electrically connecting the first and the second metal. The invention is particularly useful for removing Zn or Sn from Zn- or Sn- containing steel scrap.
(FR)
L'invention concerne un procédé perfectionné pour la dissolution électrochimique d'un premier métal en créant simultanément un dégagement d'hydrogène au niveau d'un deuxième métal, ce deuxième métal étant un métal présentant une densité d'échange de courant pour le dégagement d'hydrogène plus importante que le premier métal, les deux métaux étant immergés dans un système électrolytique aqueux permettant le couplage galvanique du premier métal et du deuxième métal. Des dispositions destinées à réduire l'inhibition de ce dégagement d'hydrogène au niveau du deuxième métal permettent d'augmenter la vitesse de dissolution du premier métal. Ces dispositions consistent à choisir convenablement les températures et les concentrations de l'électrolyte, à le diviser en deux fluides couplés par un dispositif à perméabilité sélective, et à choisir convenablement la valeur de résistance d'un moyen de connexion reliant électriquement le premier et le deuxième métal. L'invention est particulièrement utile pour éliminer le zinc ou l'étain contenu dans la ferraille d'acier.
Also published as
KR1019970700446
Latest bibliographic data on file with the International Bureau