EP0190088A1 - Vorrichtung zur Trennung und Gewinnung von Metallen in Lösung durch Elektrolyse - Google Patents

Vorrichtung zur Trennung und Gewinnung von Metallen in Lösung durch Elektrolyse Download PDF

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Publication number
EP0190088A1
EP0190088A1 EP86420017A EP86420017A EP0190088A1 EP 0190088 A1 EP0190088 A1 EP 0190088A1 EP 86420017 A EP86420017 A EP 86420017A EP 86420017 A EP86420017 A EP 86420017A EP 0190088 A1 EP0190088 A1 EP 0190088A1
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EP
European Patent Office
Prior art keywords
cathode
solution
walls
filtering
diameter
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.)
Granted
Application number
EP86420017A
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English (en)
French (fr)
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EP0190088B1 (de
Inventor
Gilles Muller
Yves Rivassou
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.)
Surfax A Responsabilite Ltee Ste
Original Assignee
Surfax A Responsabilite Ltee Ste
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 Surfax A Responsabilite Ltee Ste filed Critical Surfax A Responsabilite Ltee Ste
Priority to AT86420017T priority Critical patent/ATE42773T1/de
Publication of EP0190088A1 publication Critical patent/EP0190088A1/de
Application granted granted Critical
Publication of EP0190088B1 publication Critical patent/EP0190088B1/de
Expired legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells

Definitions

  • the present invention relates to a device for isolating and extracting metals in solution, by electrolytic means.
  • the present invention aims to remedy these drawbacks.
  • the cathode made of copper or of another material which is a good conductor of electricity
  • the cathode made of copper or of another material which is a good conductor of electricity
  • two filtering walls delimiting in part a completely closed enclosure for recovering metal adhering to the cathode detached from the latter, and made of a material which is not electrically conductive, the circulation of the solution containing the metal being produced in such a way that the latter continuously crosses the filtering surfaces.
  • metal will deposit on the surface of the cathode, while another part of the metal in powder form will be retained around the cathode by the filtering surfaces located on either side of this, or collected in the enclosure delimited by the two filtering walls.
  • the presence of the two filter walls is very interesting because it allows the use of high current densities which accelerate the electrolytic process, but which tend to produce deposits of powdery metal, which detach from the cathode and are subsequently found in suspension in the solution.
  • the presence of such particles is not a problem since they are retained by the filtering walls, or collected in the enclosure delimited by the two filtering walls. It should be noted that the volume of this enclosure is not critical and only depends on the amount of metal to be recovered.
  • the operating conditions of the device are such that the electrolyte-cathode contact cannot be established outside the part of the cathode surface comprised between the filtering walls.
  • the direction of circulation of the solution is directed from the anode to the cathode, and the cathode is arranged, inside the enclosure, as far as possible from the anode, which promotes the adhesion of the powdered metal. against the latter.
  • the flow rate of the liquid flow is chosen at a large value of the order of 10 to 40 1 / min and per dm 2 of cathode surface, which provides very advantageous performances allowing a reduction of the surface of the cathode very substantial compared to on the surface of the cathodes of traditional electrolysis cells.
  • the circulation of the solution is obtained using a pump, and produced in such a way that the electrolyte, once injected under pressure into the filtration chamber, passes under pressure through a filtering wall in the cathode enclosure, where it is subject to strong turbulence around the cathode.
  • the pressure and the flow rate of the electrolyte are such that the volume of the enclosure is renewed in 1 to 10 seconds. Given the rapid formation of a deposit on a reduced cathode surface, subjected to high current densities, the cathode is well protected and resists well to the chemical aggressiveness of certain electrolytes.
  • the filtering walls are made of fully combustible dielectric material, have a thickness of between 2 and 20 mm and have pores with a diameter of between 1 to 50 microns , and the cathode surface is between 1 and 10 dm 2.
  • the cathodic current density is between 0.1 and 20 A / dm 2 .
  • the two filtering walls are of cylindrical shape, arranged concentrically to each other, and joined by two end pieces made of an electrical insulating material, one of which has a diameter equal to the outside diameter of the outer wall, and is constituted by a solid disc and the other, of the same outer diameter, is in the form of an annular crown whose central opening has a diameter substantially equal to the inner diameter of the inner wall, the cathode being housed in the annular space formed between the two walls and being connected to a supply wire passing through one of the two end pieces.
  • the direction of circulation of the solution is oriented from the outside towards the inside of the cell delimited by the filtering walls. This results, taking into account the increase in the speed of the solution in the external filtering wall and the convergence of the flow of the solution, an improvement in the plating of the metal particles against the cathode.
  • the assembly constituted by the filtering walls, the cathode and the ends, can advantageously be shaped to have the dimensions of a filter cartridge of "standard" dimensions.
  • This cartridge can thus be mounted inside a traditional cylindrical filtration chamber in which is mounted an anode, preferably insoluble, placed in the space provided between the cartridge and the outer wall of the chamber and whose cover is modified to allow the passage of the electrical connections of the anode and the cathode.
  • the cathode consists of two rods made of a conductive material such as copper, arranged longitudinally to the inner wall, and held in contact with the latter by a conductive wire such as copper, coiled helically, one of the rods having a length at most equal to that of the filtering walls, and the other rod having a longer length, so as to pass through one of the end pieces to make the electrical connection.
  • a conductive wire such as copper, coiled helically
  • This interesting device by its simplicity, its moderate cost and its performance, makes it possible economically to recover metal, for example, when it comes to recovering 20 to 50 g of gold during an operation.
  • this device can be used for the decontamination of effluents polluted by dissolved heavy metals such as cadmium, zinc, lead, nickel, copper, etc. , or to the regeneration of pickling baths of copper and copper alloy saturated with metal.
  • the solution (2) to be treated is located in a reservoir (3).
  • a centrifugal pump (4) brings the solution from this tank to a filtration chamber (5).
  • the chamber (5) is divided into two compartments, respectively, lower (6) and upper (7), by two horizontal filter walls parallel to each other, respectively, a lower filter wall (8) and a filter wall upper (9), the wall (9).
  • a cathode (10) is connected to the negative pole of a direct current source, which is located inside the filtration chamber, by a conductive wire (12) housed inside a sealed sheath (13 ) in the part located inside of the filtration chamber (5).
  • anode (14) connected to the positive pole of the direct current source by a wire (15) housed inside a sheath (16), in the part which passes through the upper compartment of bedroom.
  • the filtration chamber (5) is equipped, at its upper end, with an overflow (17) returning the liquid having passed through the filtering walls to the reservoir (3).
  • the filter walls (8) and (9) are made of a porous material, such as a porous plastic or felt material, stiffened by a perforated plastic wall.
  • the thicknesses of the filtering walls vary from 2 to 20 mm approximately, and the diameter of the pores varies between 1 and 50 microns.
  • the electrodes are put under a voltage of 5 volts for example.
  • the solution (2) to be treated passes through the filtering walls (8) and (9) and passes into contact with the cathode.
  • the flow of the liquid is of the order of 10 to 40 1 / min per dm 2 of cathodic surface, the cathodic current density being of the order of 0.1 to 20 A / dm 2 depending on the chemical nature of the electrolyte and according to its metal concentration.
  • the isolated metal will be, partly, retained on the cathode and, in part, retained around the cathode in a pulverulent form, these latter particles being trapped in the porosities of the wall (9), or remaining in the space between the two walls (8) and (9).
  • Figures 2 and 3 show an embodiment of an electrolysis cell constituted by the two filter walls and the cathode.
  • This cell comprises two cylindrical and concentric walls (I8) and (19), each having a length of 250 mm, the diameter of the external wall (18) being 70 mm and the diameter of the internal wall (19) being 30 mm.
  • the thickness of the wall (18) is 2 mm, while the thickness of the wall (19) is of the order of 5 to 7 mm.
  • the two walls (18) and (19) are made integral with one another by two end pieces (20) and (22) fixed at their ends, the end piece (20) being in the form of a solid disc. , while the end piece (22) is in the form of a crown having a central opening (23) of diameter substantially equal to the inside diameter of the internal filtering wall (19).
  • the length of the rod (25) is of the order of 200 mm, while that of the rod (24) is of the order of 300 mm, so that it passes through the end piece (20) for the making the electrical connection.
  • the rods (24, 25) are fixed to the tube (19) forming the inner filtering wall, by means of a copper wire (26) wound helically.
  • the length of the copper wire is calculated, so that the surface of the rods (24, 25) increased by the surface of the wire is of the order of 1 dm 2 .
  • This cell is advantageously made from combustible materials.
  • the cell shown in Figures 2 and 3 can be mounted inside a cylindrical filtration chamber (27) of standard dimensions, in which is arranged an insoluble anode (28), disposed between the cartridge and the inner wall of the bedroom.
  • a cylindrical filtration chamber (27) of standard dimensions, in which is arranged an insoluble anode (28), disposed between the cartridge and the inner wall of the bedroom.
  • the installation also comprises, as shown in FIG. 4, a prefiltration chamber (30) and a centrifugal pump (32), the liquid discharged from the center of the filtering wall (19) being recycled inside the installation by centrifugal pump (32).
  • the volume of the solution is about 100 liters, the flow of the pump of 2000 1 / h and the amperage of 20 Amps on average.
  • the invention brings a great improvement to the existing technique by providing a device of simple design, of moderate cost price, and very efficient, which can be implemented for numerous metal recovery applications. in ionic solution.
  • the cathode could be constituted by a metal cylinder having regularly distributed openings to achieve a transverse passage of the solution, without the this goes beyond the scope of the invention.

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)
EP86420017A 1985-01-22 1986-01-21 Vorrichtung zur Trennung und Gewinnung von Metallen in Lösung durch Elektrolyse Expired EP0190088B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86420017T ATE42773T1 (de) 1985-01-22 1986-01-21 Vorrichtung zur trennung und gewinnung von metallen in loesung durch elektrolyse.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8501242 1985-01-22
FR8501242A FR2576326B1 (fr) 1985-01-22 1985-01-22 Dispositif d'isolement et d'extraction de metaux en solution, par voie electrolytique

Publications (2)

Publication Number Publication Date
EP0190088A1 true EP0190088A1 (de) 1986-08-06
EP0190088B1 EP0190088B1 (de) 1989-05-03

Family

ID=9315735

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86420017A Expired EP0190088B1 (de) 1985-01-22 1986-01-21 Vorrichtung zur Trennung und Gewinnung von Metallen in Lösung durch Elektrolyse

Country Status (5)

Country Link
US (1) US4702806A (de)
EP (1) EP0190088B1 (de)
AT (1) ATE42773T1 (de)
DE (1) DE3663152D1 (de)
FR (1) FR2576326B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2607832A1 (fr) * 1986-12-08 1988-06-10 Jehanno Jean Daniel Dispositif de recuperation electrolytique de metaux en solutions diluees
EP0428918A1 (de) * 1989-11-17 1991-05-29 WUE UMWELT-ENGINEERING GmbH Verfahren und Vorrichtung zur Abscheidung und Rückgewinnung hochwertiger Metalle, insbesondere von Edelmetallen und Quecksilber, aus gebrauchten Lösungen
WO1995007375A1 (en) * 1993-09-10 1995-03-16 Ea Technology Ltd. Cell for the recovery of metals from dilute solutions

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4948489A (en) * 1989-04-19 1990-08-14 Environmetal Recovery Systems, Inc. Electrolytic treatment apparatus
US5348629A (en) * 1989-11-17 1994-09-20 Khudenko Boris M Method and apparatus for electrolytic processing of materials
US6086733A (en) * 1998-10-27 2000-07-11 Eastman Kodak Company Electrochemical cell for metal recovery
US6149797A (en) * 1998-10-27 2000-11-21 Eastman Kodak Company Method of metal recovery using electrochemical cell
AU2001229798A1 (en) * 2000-01-10 2001-07-24 Michael John Sole Removal of metals from solution
DE10216944A1 (de) * 2002-04-17 2003-11-06 Starck H C Gmbh Verfahren zur elektrochemischen Auflösung von Pulvern und dafür geeignete Elektrolysezellen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2543600A1 (de) * 1975-09-30 1977-04-07 Siemens Ag Vorrichtung zur elektrolytischen rueckgewinnung von metallen aus waessrigen loesungen
GB1598306A (en) * 1976-12-07 1981-09-16 Kodak Ltd Electrolytic method and apparatus
US4367127A (en) * 1981-06-29 1983-01-04 Vanguard Research Associates, Inc. Metals recovery cell and electrode assembly for same
US4384939A (en) * 1981-03-12 1983-05-24 Bell Telephone Laboratories, Incorporated Gold recovery system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US881527A (en) * 1906-05-01 1908-03-10 Ernest E Armstrong Process for treating complex cobalt ores and for refining cobalt from nickel, arsenical, and silver-bearing ores.
US1052256A (en) * 1912-01-05 1913-02-04 Noak Victor Hybinette Electrolysis of metal-salt solutions.
US1358858A (en) * 1920-01-16 1920-11-16 Milo W Krejci Diaphragm for electrolytic cells
US2563903A (en) * 1949-12-07 1951-08-14 Zadra John Benjamin Electrolytic cell for the deposition of gold and/or silver from solutions

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2543600A1 (de) * 1975-09-30 1977-04-07 Siemens Ag Vorrichtung zur elektrolytischen rueckgewinnung von metallen aus waessrigen loesungen
GB1598306A (en) * 1976-12-07 1981-09-16 Kodak Ltd Electrolytic method and apparatus
US4384939A (en) * 1981-03-12 1983-05-24 Bell Telephone Laboratories, Incorporated Gold recovery system
US4367127A (en) * 1981-06-29 1983-01-04 Vanguard Research Associates, Inc. Metals recovery cell and electrode assembly for same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2607832A1 (fr) * 1986-12-08 1988-06-10 Jehanno Jean Daniel Dispositif de recuperation electrolytique de metaux en solutions diluees
EP0428918A1 (de) * 1989-11-17 1991-05-29 WUE UMWELT-ENGINEERING GmbH Verfahren und Vorrichtung zur Abscheidung und Rückgewinnung hochwertiger Metalle, insbesondere von Edelmetallen und Quecksilber, aus gebrauchten Lösungen
WO1995007375A1 (en) * 1993-09-10 1995-03-16 Ea Technology Ltd. Cell for the recovery of metals from dilute solutions
GB2296720A (en) * 1993-09-10 1996-07-10 Ea Tech Ltd Cell for the recovery of metals from dilute solutions

Also Published As

Publication number Publication date
FR2576326B1 (fr) 1990-08-03
ATE42773T1 (de) 1989-05-15
FR2576326A1 (fr) 1986-07-25
US4702806A (en) 1987-10-27
DE3663152D1 (en) 1989-06-08
EP0190088B1 (de) 1989-05-03

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