EP0149938B1 - Procédé électrochimique pour enlever la gangue entourant des éléments métalliques dans des matériaux en vrac - Google Patents

Procédé électrochimique pour enlever la gangue entourant des éléments métalliques dans des matériaux en vrac Download PDF

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Publication number
EP0149938B1
EP0149938B1 EP19840402618 EP84402618A EP0149938B1 EP 0149938 B1 EP0149938 B1 EP 0149938B1 EP 19840402618 EP19840402618 EP 19840402618 EP 84402618 A EP84402618 A EP 84402618A EP 0149938 B1 EP0149938 B1 EP 0149938B1
Authority
EP
European Patent Office
Prior art keywords
basket
gangue
process according
metallic elements
metallic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19840402618
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0149938A2 (fr
EP0149938A3 (en
Inventor
Noel Lacoudre
Jacques Montlucon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electricite de France SA
Original Assignee
Electricite de France SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electricite de France SA filed Critical Electricite de France SA
Publication of EP0149938A2 publication Critical patent/EP0149938A2/fr
Publication of EP0149938A3 publication Critical patent/EP0149938A3/fr
Application granted granted Critical
Publication of EP0149938B1 publication Critical patent/EP0149938B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating

Definitions

  • the present invention relates to an electrochemical process for removing the gangue surrounding metallic elements in bulk materials, notably originating from archaeological excavations and, more particularly, from marine archaeological excavations.
  • the present invention aims to provide a method allowing the treatment of large quantities of bulk materials to separate the metallic elements, thus making possible the treatment of materials from marine archaeological excavations.
  • the cathodic treatment can be improved by placing cathodic conductive elements within the basket, for example vertical grids in addition to the central metallic part. It is also possible to add, during filling with the bulk materials, metallic chains or flexible metallic mesh which are thus embedded in the bulk mass.
  • the anode is advantageously of cylindrical symmetry and arranged around the basket.
  • the conductors forming the cathode and the anode can be made of any low-destructible material having sufficient conductivity. Iron or steel can be used, for example.
  • the basket is preferably made of a material which does not conduct electricity to allow the anions (chlorides, sulphides) to migrate from the interior of the basket to the external anode. It can be made in particular of plastic.
  • the basic aqueous bath which is contained in the cell is advantageously a bath containing from 8 to 40 grams of OH- / 1 ions.
  • Solutions for water-soluble hydroxides or carbonates, for example KOH, NaOH, Na 2 CO 3 , LiOH, can be used for this purpose.
  • the treatment can generally be carried out at a temperature close to room temperature (from 15 to 50 ° C).
  • the treatment time depends on the nature of the gangue and its size on the surface and in volume. Generally, the processing time can vary from a few tens of hours to a few hundred hours and is typically 100 to 600 hours.
  • An additional dechlorination treatment can be carried out in a conventional manner if necessary.
  • the method according to the present invention also finds application in the processing of ores containing native metals and, in particular, precious metals such as gold or silver.
  • the electrolysis cell 1 comprises a tank 2 of cylindrical shape. This tank contains an aqueous bath 3 consisting of an aqueous solution of potassium hydroxide at 5% by weight.
  • a basket 4 of cylindrical plastic shape In the center of this tank is placed a basket 4 of cylindrical plastic shape, the side walls of which are pierced with holes.
  • the assembly of the rod 5 and the grids 6 and 7 forms the cathode.
  • a cylindrical grid 8 of stainless steel is arranged around the basket 4. This grid forms the anode.
  • the basket can have a diameter of 40 cm and a height of 50 cm.
  • a polarization is imposed between the anode and the cathode leading to a significant release of hydrogen by a current of 10A at approximately 3V of voltage.
  • the polarization is maintained for 500 hours. Then, a rinse is carried out in the electrolysis tank, the basket is removed and the elements of the gangue are easily released.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
EP19840402618 1984-01-20 1984-12-17 Procédé électrochimique pour enlever la gangue entourant des éléments métalliques dans des matériaux en vrac Expired EP0149938B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8400922 1984-01-20
FR8400922A FR2558486B1 (fr) 1984-01-20 1984-01-20 Procede electrochimique pour enlever la gangue entourant des elements metalliques dans des materiaux en vrac

Publications (3)

Publication Number Publication Date
EP0149938A2 EP0149938A2 (fr) 1985-07-31
EP0149938A3 EP0149938A3 (en) 1985-08-21
EP0149938B1 true EP0149938B1 (fr) 1987-07-08

Family

ID=9300345

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840402618 Expired EP0149938B1 (fr) 1984-01-20 1984-12-17 Procédé électrochimique pour enlever la gangue entourant des éléments métalliques dans des matériaux en vrac

Country Status (7)

Country Link
EP (1) EP0149938B1 (enrdf_load_stackoverflow)
EG (1) EG16769A (enrdf_load_stackoverflow)
ES (1) ES8605304A1 (enrdf_load_stackoverflow)
FR (1) FR2558486B1 (enrdf_load_stackoverflow)
GR (1) GR850103B (enrdf_load_stackoverflow)
TR (1) TR22020A (enrdf_load_stackoverflow)
YU (1) YU7585A (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2626586B1 (fr) * 1988-02-01 1991-11-29 Electricite De France Procede electrochimique pour le nettoyage de materiaux en feuille et dispositifs pour sa mise en oeuvre
GB9019216D0 (en) * 1990-08-31 1990-10-17 Atomic Energy Authority Uk Filter cleaning
GB2356870A (en) * 1999-12-01 2001-06-06 Secr Defence Dissolution of metal structures

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB505273A (en) * 1936-08-01 1939-05-01 John Galbraith Quiros Worledge Electro-chemical process for renovating table plate and other metal surfaces
US3497445A (en) * 1967-07-28 1970-02-24 Economics Lab Apparatus for cleaning and detarnishing silverware

Also Published As

Publication number Publication date
FR2558486A1 (fr) 1985-07-26
ES539612A0 (es) 1986-04-01
ES8605304A1 (es) 1986-04-01
GR850103B (enrdf_load_stackoverflow) 1985-05-16
TR22020A (tr) 1986-01-13
EP0149938A2 (fr) 1985-07-31
EG16769A (en) 1993-04-30
EP0149938A3 (en) 1985-08-21
YU7585A (en) 1988-04-30
FR2558486B1 (fr) 1986-06-13

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