EP4321652A1 - Vorrichtung zur extraktion eines auf einer kathode elektrolytisch aufgebrachten metalls - Google Patents

Vorrichtung zur extraktion eines auf einer kathode elektrolytisch aufgebrachten metalls Download PDF

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Publication number
EP4321652A1
EP4321652A1 EP22190058.2A EP22190058A EP4321652A1 EP 4321652 A1 EP4321652 A1 EP 4321652A1 EP 22190058 A EP22190058 A EP 22190058A EP 4321652 A1 EP4321652 A1 EP 4321652A1
Authority
EP
European Patent Office
Prior art keywords
consumable
cathode
metal
cell
extraction
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.)
Pending
Application number
EP22190058.2A
Other languages
English (en)
French (fr)
Inventor
Luc VAN HEE
Andrea Baldini
Cédric FLANDRE
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.)
John Cockerill SA
Original Assignee
John Cockerill 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 John Cockerill SA filed Critical John Cockerill SA
Priority to EP22190058.2A priority Critical patent/EP4321652A1/de
Priority to CA3208452A priority patent/CA3208452A1/en
Priority to US18/365,255 priority patent/US20240052511A1/en
Priority to CN202310988418.7A priority patent/CN117587465A/zh
Publication of EP4321652A1 publication Critical patent/EP4321652A1/de
Pending legal-status Critical Current

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Classifications

    • 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
    • C25C7/06—Operating or servicing
    • C25C7/08—Separating of deposited metals from the cathode
    • 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
    • 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
    • C25C7/02—Electrodes; Connections thereof
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
    • C25C1/06—Electrolytic production, recovery or refining of metals by electrolysis of solutions or iron group metals, refractory metals or manganese
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
    • C25C1/06—Electrolytic production, recovery or refining of metals by electrolysis of solutions or iron group metals, refractory metals or manganese
    • C25C1/08—Electrolytic production, recovery or refining of metals by electrolysis of solutions or iron group metals, refractory metals or manganese of nickel or cobalt
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
    • C25C1/12—Electrolytic production, recovery or refining of metals by electrolysis of solutions of copper
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
    • C25C1/16—Electrolytic production, recovery or refining of metals by electrolysis of solutions of zinc, cadmium or mercury

Definitions

  • the present invention relates to a device for producing iron or other pure metals or even alloys by electrolytic means, and in particular to the means used for the extraction of metal plates deposited at the cathode of an electrolytic cell.
  • the invention also relates to specific uses of the device.
  • cast iron which is an alloy of iron and carbon with a content greater than 2%
  • DRI direct iron reduction
  • methane natural gas
  • One of the promising sectors implemented consists of replacing carbon monoxide with dihydrogen as a reducing gas for the ore.
  • the gas composed mainly of H 2 and CO currently used in direct reduction processes is replaced by pure dihydrogen during the manufacture of "pre-reduced" iron, which can then be charged into electric arc furnaces.
  • the performance in terms of CO 2 emissions is promising, namely less than 300kg CO 2 per tonne of steel (instead of 1850kg with the traditional sector), in the case where hydrogen is produced by electrolysis of water with “green” electricity.
  • electro-refining which consists of electrolytically dissolving an impure metal anode in an acid or alkaline bath, the pure metal ions then being deposited on the cathode in the metallic state under the action of an electric current.
  • This method can purify metals like copper, nickel, zinc, manganese, etc. but many purification steps are often necessary.
  • the electrodes are generally arranged vertically and the deposits are made at very low current density.
  • the applied voltage can be high, which implies unfavorable efficiency, due to sensitivity to the anode/cathode distance.
  • the cathodes are generally coated on both sides with an adherent deposit and are replaced when the quantity of metal produced is sufficient.
  • the cathodes, inert are reusable and the extraction, most often in clusters, is carried out on an overhead crane or by means of robotic machines, the extraction being followed by stripping, which is the stage of separation of the deposited metal plate from the cathode support using mechanical means.
  • the cathode is sacrificial. A fine deposit of a given metal can be generated initially in a parallel die on an inert cathode and then detached to itself serve as a cathode in the production process. In this case, the cathode consists exclusively of the desired metal.
  • the electrolytic process is especially interesting for materials presenting only one valence state (e.g. Zn 2+ ), but this is not the case for iron (Fe 2+ and Iron 3+ ). To avoid losing a significant part of the yield by looping Fe 2+ ⁇ Fe 3+ then vice versa, we could use separator and ion exchange membranes.
  • the electrolytic reaction generates pure iron plates at the cathode and oxygen gas at the anode. These iron plates can then be melted with other elements or scrap metal in an electric furnace to produce steel.
  • the cell In addition, to have the lowest possible energy consumption, the cell must have a limited distance between the electrodes. The difficulty with closed cells is then the extraction of the metal deposited on the cathode, especially for large sizes (>1 m 2 ), because the cathode must remain permanently in the cell. This in situ extraction also implies that the deposits are non-adherent or easily detachable from the cathodes to best facilitate mechanical extraction through a limited opening in the cell.
  • the present invention aims to provide a solution making it possible to overcome the disadvantages of the state of the art.
  • the invention aims to provide a means for separating in a practical and easy manner the metal plates deposited on the cathodes in electrolytic production processes, this extraction necessarily being in situ because it must take into account the physical constraints imposed on the electrolytic cell, such as having a closed cell, without dismantling the cell, a short anode-cathode distance to maintain good energy efficiency, etc.
  • a first aspect of the present invention relates to a device for the production of a pure metal or an alloy of this metal by electrolytic reduction of an ore of this metal or of a substance containing an oxidized form of this metal , said device comprising a cell provided with an anode, a cathode, an electrolyte and a removable system for closing the cell, characterized in that the cathode is provided with a non-adherent coating for the metal electrolytically deposited and in that the device further comprises an electrically conductive consumable element intended to facilitate the extraction of a plate of said metal electrolytically deposited on the cathode, said consumable being placed in the cell in the extension of the cathode or in partial overlap with it, with mechanical and therefore electrical contact at one end with the cathode and protruding from the electrolytic zone of the cell, so as to allow, in operation, a simultaneous deposition of said metal on the cathode and on part of the consumable and to allow the subsequent extraction from the cell of the assembly consist
  • Another aspect of the invention relates to a use of the device described above, in which, after extraction, the consumable is either separated from said pure metal or alloy of the deposited metal in order to avoid any pollution, or subsequently melted with the deposited metal.
  • the use concerns the electrolytic deposition of iron in a basic medium, where the consumable is a low-carbon steel sheet.
  • the use relates to the electrorefining of zinc, nickel or copper, in an acidic medium, the consumable being respectively a zinc, nickel or copper plate.
  • FIG. 1 schematically represents a closed iron electrowinning cell according to one embodiment of the present invention, during the production phase of the metal deposit.
  • FIG. 2 schematically represents an open iron electroextraction cell according to one embodiment of the present invention, during the iron plate extraction phase.
  • FIG. 3 represents an example of a realistic mode of execution of the present invention comprising an electrolytic cell with a removable closure system and a system for recovering the iron plate deposited at the cathode.
  • FIG. 4 shows an example of moving the removable cell closing system.
  • FIG. 5 shows a detailed view in an example of the system allowing the extraction of the iron plate.
  • the present invention consists not only of carrying out an electrolytic metallic deposition on a cathode, but also of co-depositing the metal in an adherent manner on at least part of an electrically conductive consumable, produced for example in the form of a steel plate. which may be compatible for the subsequent stages of metal melting.
  • the consumable element is introduced into the electrolytic cell before starting the deposition and is positioned such that electrical contact with the cathode is ensured. This allows extraction of the deposit, this being carried out simultaneously on the cathode and on the consumable, thanks to the use of a gripping system such as pliers or similar elements preferably positioned on a part of the consumable which will not have received no deposit or a very low deposit.
  • the cell will preferably be positioned in an inclined manner so that the consumable will be located in a lower part and the cathode in a higher part of the cell, with at least one part of the consumable not covered by the deposit, which will allow seizure mechanics of the consumable, when opening the cell at the lower part, after emptying and rinsing the cell.
  • the extraction of the deposited metal is therefore carried out by removing the consumable part concomitantly with the complete deposit which does not adhere to the cathode, preferably thanks to a particular coating of the latter, such as a carbon or graphite base. low roughness.
  • the extraction of the metal is then done by a guided translation movement.
  • the deposited metal/consumable plate is then transferred to a table which supports it in order to avoid material breakage during the extraction process.
  • the cell can be oriented at an angle going from horizontal to vertical, but preferably at an angle between 20° and 60° relative to the horizontal to take advantage of the effect of gravity and also in order to limit the bulk.
  • the cell preferably has a height of between 50 mm and 700 mm, and more preferably between 100 mm and 300 mm. Its length will be 1 m to 4 m, and preferably between 1 m and 3.5 m.
  • the width of the cell will be 1 m to 2 m, and preferably 1 m to 1.5 m.
  • the length of the consumable part is less than 50% of the length of the cathode, preferably less than 20% thereof and still preferably less than 10% thereof.
  • the width of the consumable part must be at least approximately equal to that of the cathode with which it is in contact.
  • the expected thickness for the deposit will be between 2 mm and 50 mm, preferably between 3 mm and 5 mm, depending on the surface of the cathode in order to present a plate of sufficient resistance for extraction while maintaining a minimum anode-cathode distance during the entire deposition phase.
  • FIG. 1 schematically represents a configuration of electrolytic cell 1, adapted for the electroextraction of iron, during the production phase using the device according to the invention.
  • one end of the anode 2 is positioned on the one hand opposite a part of the cathode 3 and on the other hand opposite a part of the consumable 5 which adjoins or covers the lower edge of the cathode 3, with which it is physically in contact, which ensures perfect electrical continuity between the cathode 3 and the consumable 5.
  • the consumable 5 is therefore dimensioned to protrude downwards from the area of the cell which contains the electrolyte 8. A part of the consumable 5 will therefore not be covered by the electrolytically deposited metal and the protruding part 5 " consumable 5 will make it easier to grip.
  • the electrolytic cell 1 is constantly closed during its operation and a removable closing system 6 serves to close the cell 1.
  • the connection between the cell 1 and the closing system 6 is waterproof to prevent any escape of electrolyte 8.
  • a table on slides 7 is able to approach the cell 1 and to tilt rotatably at an angle making it parallel to the cell ( figure 2 ).
  • three pneumatic grippers 10 equipping the table 7 ( figure 5 ) grab the consumable 5 and pull it out of the cell.
  • the table 7 can rotate back to a horizontal position and the plate can then be transferred to a cart to be used in the next step of the treatment process.
  • the table could already be inclined and position itself in this way before leaving again. The deposit plate would then remain tilted until removed.
  • FIG 2 schematically shows an embodiment for extracting the iron plate 4 at the end of the production process.
  • Cell 1 was previously emptied of its electrolyte 8 to prevent it from flowing out when the plate was extracted.
  • the removable closure and collection system 6 is for example moved in a horizontal translation, to allow access to the consumable 5 and its recovery (see figure 4 ).
  • the cathode will be made of a material with poor adhesion to iron, such as a material based on carbon, graphite with low roughness, graphite impregnated or coated with filler or pure metals such as silver or copper and some of their alloys, possibly coated.
  • plate 4 cannot be lifted to be detached directly from cathode 3 as in state stripping methods. art.
  • cell 1 When cell 1 is open, part of the consumable 5 must be able to exit by overflowing, as indicated above, in order to allow its recovery by a mobile system 7 for gripping and recovering the plate, such as a table.
  • the removable system 6 will then be used to bring a new consumable 5 into contact with the cathode 3.
  • the plate 4 with the consumable 5 is grasped by pliers, clamps or similar elements 10 and is then pulled by a guided translation movement, parallel to the cell.
  • the metallic deposit “glued” to the consumable 5 but not to the cathode 3, which is non-adherent, detaches from the cathode 3 and is driven by the consumable 5 out of the cell in its translation movement (see figure 5 ).
  • the iron plate 4 is then transferred to a table during its extraction, as described above.

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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)
EP22190058.2A 2022-08-11 2022-08-11 Vorrichtung zur extraktion eines auf einer kathode elektrolytisch aufgebrachten metalls Pending EP4321652A1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP22190058.2A EP4321652A1 (de) 2022-08-11 2022-08-11 Vorrichtung zur extraktion eines auf einer kathode elektrolytisch aufgebrachten metalls
CA3208452A CA3208452A1 (en) 2022-08-11 2023-08-01 Device for extracting a metal electrolytically deposited on a cathode
US18/365,255 US20240052511A1 (en) 2022-08-11 2023-08-04 Device for extracting a metal electrolytically deposited on a cathode
CN202310988418.7A CN117587465A (zh) 2022-08-11 2023-08-07 用于抽取电解沉积在阴极上的金属的设备

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22190058.2A EP4321652A1 (de) 2022-08-11 2022-08-11 Vorrichtung zur extraktion eines auf einer kathode elektrolytisch aufgebrachten metalls

Publications (1)

Publication Number Publication Date
EP4321652A1 true EP4321652A1 (de) 2024-02-14

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EP22190058.2A Pending EP4321652A1 (de) 2022-08-11 2022-08-11 Vorrichtung zur extraktion eines auf einer kathode elektrolytisch aufgebrachten metalls

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Country Link
US (1) US20240052511A1 (de)
EP (1) EP4321652A1 (de)
CN (1) CN117587465A (de)
CA (1) CA3208452A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3523873A (en) * 1965-12-14 1970-08-11 Canadian Copper Refiners Ltd Electrodeposition of strippable metal coatings and compositions and artiticles useful therefor
FR2556359A1 (fr) * 1983-12-12 1985-06-14 Sayer Bruno Revetement pelable et conducteur en electrometallurgie et procede pour son obtention
US6632333B1 (en) * 1998-11-27 2003-10-14 Outokumpu Oyj Device for separating metal deposit from a cathode
US8764962B2 (en) 2010-08-23 2014-07-01 Massachusetts Institute Of Technology Extraction of liquid elements by electrolysis of oxides

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3523873A (en) * 1965-12-14 1970-08-11 Canadian Copper Refiners Ltd Electrodeposition of strippable metal coatings and compositions and artiticles useful therefor
FR2556359A1 (fr) * 1983-12-12 1985-06-14 Sayer Bruno Revetement pelable et conducteur en electrometallurgie et procede pour son obtention
US6632333B1 (en) * 1998-11-27 2003-10-14 Outokumpu Oyj Device for separating metal deposit from a cathode
US8764962B2 (en) 2010-08-23 2014-07-01 Massachusetts Institute Of Technology Extraction of liquid elements by electrolysis of oxides

Also Published As

Publication number Publication date
CA3208452A1 (en) 2024-02-11
CN117587465A (zh) 2024-02-23
US20240052511A1 (en) 2024-02-15

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