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 PDFInfo
- 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
Links
Images
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.
Landscapes
- 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)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8400922A FR2558486B1 (fr) | 1984-01-20 | 1984-01-20 | Procede electrochimique pour enlever la gangue entourant des elements metalliques dans des materiaux en vrac |
FR8400922 | 1984-01-20 |
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 (es) |
EG (1) | EG16769A (es) |
ES (1) | ES8605304A1 (es) |
FR (1) | FR2558486B1 (es) |
GR (1) | GR850103B (es) |
TR (1) | TR22020A (es) |
YU (1) | YU7585A (es) |
Families Citing this family (3)
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)
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 |
-
1984
- 1984-01-20 FR FR8400922A patent/FR2558486B1/fr not_active Expired
- 1984-12-17 EP EP19840402618 patent/EP0149938B1/fr not_active Expired
- 1984-12-21 TR TR2202084A patent/TR22020A/xx unknown
-
1985
- 1985-01-15 GR GR850103A patent/GR850103B/el unknown
- 1985-01-16 ES ES539612A patent/ES8605304A1/es not_active Expired
- 1985-01-18 YU YU7585A patent/YU7585A/xx unknown
- 1985-01-19 EG EG2985A patent/EG16769A/xx active
Also Published As
Publication number | Publication date |
---|---|
EG16769A (en) | 1993-04-30 |
ES8605304A1 (es) | 1986-04-01 |
ES539612A0 (es) | 1986-04-01 |
EP0149938A3 (en) | 1985-08-21 |
YU7585A (en) | 1988-04-30 |
GR850103B (es) | 1985-05-16 |
TR22020A (tr) | 1986-01-13 |
EP0149938A2 (fr) | 1985-07-31 |
FR2558486B1 (fr) | 1986-06-13 |
FR2558486A1 (fr) | 1985-07-26 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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