EP2141265A1 - Stripping apparatus and method for removing an electrodeposited metal layer from a cathode plate - Google Patents

Stripping apparatus and method for removing an electrodeposited metal layer from a cathode plate Download PDF

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Publication number
EP2141265A1
EP2141265A1 EP08159745A EP08159745A EP2141265A1 EP 2141265 A1 EP2141265 A1 EP 2141265A1 EP 08159745 A EP08159745 A EP 08159745A EP 08159745 A EP08159745 A EP 08159745A EP 2141265 A1 EP2141265 A1 EP 2141265A1
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EP
European Patent Office
Prior art keywords
cathode
carousel
stripping
cathode plate
knives
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.)
Withdrawn
Application number
EP08159745A
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German (de)
English (en)
French (fr)
Inventor
Léon Crosset
Original Assignee
Technic One 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
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Application filed by Technic One SA filed Critical Technic One SA
Priority to EP08159745A priority Critical patent/EP2141265A1/en
Priority to CN200980125584.2A priority patent/CN102084036B/zh
Priority to PCT/EP2009/058149 priority patent/WO2010000717A2/en
Priority to BRPI0915708-5A priority patent/BRPI0915708B1/pt
Priority to EP09772417A priority patent/EP2318571B1/en
Priority to AU2009265804A priority patent/AU2009265804B2/en
Priority to ES09772417T priority patent/ES2390007T3/es
Publication of EP2141265A1 publication Critical patent/EP2141265A1/en
Withdrawn legal-status Critical Current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

Definitions

  • the present invention relates to the field of metal production by cathodic electrodeposition and in particular to the removal of the electrodeposited metal coating from the cathodic support plate.
  • Metal refinement by electrolysis is a well known technique applied for the production of metals like zinc, copper, silver, etc. and consists of inserting a cathode into an electrolytic cell containing a solution including an ion of the metal to be refined. Upon application of an electric field across the cell, metal is electrolytically deposited onto the surfaces of the cathode in contact with the solution to form a metal coating. The top of the cathode is generally located above the level of the solution so as to leave an area of the cathode which remains uncoated. When the metal coating has grown to the desired thickness, it must be scraped or stripped off the cathode.
  • the metal coating is scraped off the surface of the cathode while the latter is still immersed in the electrolytic solution.
  • the cathode In US 3,772,003 the cathode is in the shape of a rotating drum partially immersed in the electrolytic solution. The deposited metal is removed continuously as the cathode drum rotates by a scraping blade tangently contacting the surface thereof which stands out of the solution level.
  • disc-shaped cathodes are rotatably mounted in an electrolytic cell such as to be partially immersed in the elecrolytic solution. As the cathode rotates, a metal coating is formed on the surface thereof and is scraped by a blade immersed in the solution.
  • EP 436,602 discloses a cathode in the shape of e.g., a drum which is lifted out of an electrolytic cell when the coating is of a sufficient thickness.
  • scraping knives located below the drum and mounted on hinges so as to form a funnel or truncated cone are displayed such that when the cathode is driven down, the metal coating deposited on its inner surface is scraped off by the funnel forming blades and recovered in the centre thereof as the drum is immersed again for further coating.
  • US 3,996,127 discloses an apparatus wherein a plurality of coated cathode plates are conveyed to a stripping unit in a conveying line wherein the plates are hung side by side, forming a garland.
  • this equipment allows the coated cathode plates to be delivered to the stripping unit in an automated step-by-step process, the side-by-side arrangement of the cathodes is not compatible with today's productivity requirements and space restrictions.
  • most stripping apparatuses comprise a conveyor wherein the coated cathodes are arranged in a face-to-face relationship instead.
  • the plates are arranged in a face-to-face relationship in all these apparatuses, they must be separated from one another by a distance sufficient to allow the insertion of the stripping blades in between.
  • many apparatuses comprise a supply line where the coated cathode plates are arranged in a close packed face-to-face arrangement and further comprise a transfer device to transfer individual plates from the supply line to the stripping unit.
  • US 3,689,396 describes a first step-by-step conveyor in connection with a second, continuous conveyor to convey individual plates from the first conveyor to the stripping unit.
  • a carousel loading individual cathode plates from the conveyor to various processing stations were proposed in EP 482,258 .
  • the rotating axis of the carousel in this document is substantially vertical, and the stripping operation requires several stages which are too long according to today's standards.
  • the present invention is defined in the appended independent claims. Preferred embodiments are defined in the dependent claims.
  • the present invention provides a novel apparatus for removing an electrodeposited metal layer from a cathode plate comprising:
  • the coated cathodes are fed individually to the stripping unit by a carousel having a substantially horizontal axis of rotation.
  • the present invention is compact since the coated cathode plates are conveyed in a close packed arrangement prior to being fed to the stripping unit, and the carousel width is substantially flush with the rest of the apparatus and occupies little area on the floor compared with a carousel rotating around a vertical axis as in EP 482,258 .
  • a stripping device particularly suitable for removing an electrodeposited metal layer from a cathode plate comprises:
  • An apparatus according to the present invention further comprising a stripping device as described above is preferred and is particularly advantageous because it allows the stripping cycle to be completed with a total of five moves: (1) first rotation of the carousel to bring the coated cathode into position; (2) closing of the scissor-like frame to bring the stripping knives into contact with the top of the cathode; (3) driving the knives down along the interface between the metal coating and the cathode plate to remove the metal sheet; (4) driving the knives up again and open the scissor like frame; and (5) with a second rotation of the carousel bring the uncoated cathode plate to a discharge zone.
  • the total stripping cycle (1)-(5) for one cathode can be as short as less than 7 s, preferably less than 5 s, and most preferably, less than 4 s.
  • the stripping apparatus of the present invention comprises four main sections: (a) a conveyor (10), (b) a stripping unit (11), (c) a receiving unit (14) for receiving the stripped metal sheets, and (d) a discharge conveyor for bringing the cathode plates to further processing (e.g., the surface of plates can be cleaned for further immersion into an electrolytic cell and start the cycle again).
  • the cathode plates are arranged on the conveyor in a face-to-face arrangement. They may be fixed to the conveying line by any means known in the art. For example, they can be hung to a single or a pair of chain or rail conveyors.
  • the electrodes may be fixed to a support comprising fixing means to the conveyor, or the fixing means can be integral to the cathode plates, without any external support frame.
  • the conveyor drives the cathode plates step-by-step towards the stripping unit.
  • the downstream side of the conveyor transfers the first cathode plate (62) present onto the carousel (7) of the stripping unit.
  • the step-by-step frequency of the conveyor is in phase with the step-by-step rotation of the carousel as defined below.
  • the stripping unit comprises a carousel (7) for bringing each cathode plate one by one to its stripping position and a pair of knives run through the whole interface between the cathode plate and the metal coating.
  • the carousel (7) rotates over a substantially horizontal axis which is located not higher than the conveyor line.
  • the conveyor line is at a level comprised between the horizontal axis of rotation of the carousel and its top ridge as illustrated in the Figures.
  • the conveyor line connects with engaging means, such as a pair of slots (1) of the carousel (7) to transfer and pivotally hang a coated cathode plate (62) thereto as illustrated in Figure 1 .
  • Figure 1 shows a cathode plate (61) after stripping.
  • the coated cathode plate (62) loaded on pair of slots (1) is brought into stripping position within range of the stripping knives, whilst at the same time the cathode plate (61) which was stripped before is driven onto the discharge line (12) and the next coated cathode plate (63) is being transferred from the conveyor (11) to the pair of slots (5).
  • clamping means (13) are illustrated as connecting with slots (3) and (4) located below the axis of rotation of the carousel, but any clamping system preventing carousel (7) from rotating can be used instead.
  • the carousel could also be clamped through the motor controlling its rotation, but this solution requires the use of powerful motors which add to the cost of the apparatus.
  • a pair of stripping knives (8) is brought into contact with the two main surfaces of the cathode, at a level located above the coating line.
  • the knives (8) are mounted at the end of long arms (20) connecting to form a scissor-like frame, said arms being long enough to allow the knives to be run from the top to the bottom of the cathode plate.
  • the scissor-like frame (20) is open during rotation of the carousel (7) to give clearance to the coming coated (62) and to the departing stripped cathode plates (61) as illustrated in Figure 2 .
  • the scissor-like frame closes its arms thus bringing the knives (8) into contact with the uncoated top section of the cathode plate (cf. Figure 3 ).
  • the scissor-like frame is then driven down to run the knives through the interface between the metal coating and the cathode plate (cf. Figure 4 ).
  • a wedge like tool (31) can be positioned ahead of the knives to initiate a crack at the interface and allow the knives to run into this crack (cf. Figure 6 ).
  • Stripping devices of other types can be conveniently used with the stripping apparatus of the present invention, but the one described above, with the knives mounted at the end of a scissor-like frame is particularly preferred as it allows to substantially reduce the size of the equipment and reduce the number of knives movements required to carry out the stripping operation: closing the scissor-like frame, driving it down, driving it up, and opening the scissor-like frame.
  • Such economy of movements allows the control unit to be simpler and saves a lot of time.
  • the time required for one stripping cycle with the apparatus of the present invention is estimated between 3 and 7 s, preferably between 3 and 6 s, most preferably between 3 and 5 s, leading to stripping cycle time reductions of up to 70% with respect to existing stripping lines.
  • Figure 6 illustrates a front view of the stripping unit showing cathode plates (62) and (61) hanging on the carousel (7), the former at its stripping position and the latter at its transfer position onto the discharge zone (12).
  • the carousel's rotation is driven by motor (30).
  • the knives (8) are shown in stripping position, contacting the uncoated top section of the cathode plate (62). It can be appreciated from Figure 5 that the alignment of the cathode plate (62) to be stripped and the stripping knives (8) is critical for the stripping operation. For this reason it may be advantageous to provide the carousel with alignment means (1 5) for bringing the cathode in alignment with the stripping knives (8) as the cathode is driven to the stripping unit (11).
  • a simple and efficient alignment means (15) consists of curved handles positioned in the inner side of the carousel's walls, vis-à-vis each slot and such that a cathode (62) loaded on a pair of slots (5) is progressively and smoothly being aligned as it pivots around its hanging hinges upon rotation of the carousel (7) until it reaches its stripping position in stripping unit (11).
  • Other alignment means can be used, but this is so simple and flawless that it is particularly preferred.
  • the coating sheets (6b) are made of purified metal which is usually very ductile and can weigh a couple of hundreds of kilograms. As the stripping knives (8) run down along the coating-cathode interface the metal sheet (6b) detaches itself from its support (6a) and eventually falls down.
  • the receiving unit (14) serves to ensure that the falling metal sheet (6b) does not crash and crumple under the impact.
  • Several types of receiving units exist in the market as for instance the ones described in US2007/0272561 or in US 3,625,806 , and can be conveniently used in the present invention.
  • a receiving unit (14) comprising a series of wheels facing each other and mounted with rubber tyres to damp the impact.
  • the series of wheels are so arranged as to bring the falling metal sheet (6b) from a substantially vertical position as it falls to a horizontal one as it is laid down onto a conveying belt or any other receiving element. Usually a number of sheets are stacked on said receiving element before being conveyed away for further processing.
  • a metal sheet (6b) When stripped off the cathode surfaces (6a), a metal sheet (6b) is folded in two, the folding line corresponding to the bottom edge of the cathode which was immersed in an electrolytic cell. If all the folded metal sheets are stacked with the folding line on the same side, the pile will tilt on one side and will be unstable. In order to increase the stability of a stack of metal sheets, it is preferred that the arrangement of the series of wheels is suitable for laying the metal sheets onto the receiving element with their folding lines with alternating orientations.
  • first series of facing wheels in alignment with the hanging cathode to catch the falling metal sheet and a second series of facing wheels alternatingly guiding the metal sheets so as to lay them onto the receiving element once with the folding line positioned upstream and next with the folding line positioned downstream with respect to the direction of motion of the line for each new falling sheet.
  • the second series of facing wheels may be mounted on a carriage, itself pivotally mounted below the first series of wheels. By oscillating said carriage with each new metal sheet, the folding line thereof is led downstream or upstream to achieve the desired effect.
  • the discharge line (12) is located downstream of the carousel (7) and is adapted to receive the stripped cathode plates being evacuated from their stripping position.
  • the discharge zone comprises a conveyor similar to the one described in point (a) supra.
  • the stripped cathodes are conveyed away step-by-step from the carousel for further handling. Generally the surfaces of the cathode plates are treated and then the plates are brought back to the electrolytic cells for further electrolytic metal deposition.

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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)
  • Electroplating Methods And Accessories (AREA)
EP08159745A 2008-07-04 2008-07-04 Stripping apparatus and method for removing an electrodeposited metal layer from a cathode plate Withdrawn EP2141265A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP08159745A EP2141265A1 (en) 2008-07-04 2008-07-04 Stripping apparatus and method for removing an electrodeposited metal layer from a cathode plate
CN200980125584.2A CN102084036B (zh) 2008-07-04 2009-06-30 从阴极板上去除电沉积的金属层的剥离设备及方法
PCT/EP2009/058149 WO2010000717A2 (en) 2008-07-04 2009-06-30 Stripping apparatus and method for removing an electrodeposited metal layer from a cathode plate
BRPI0915708-5A BRPI0915708B1 (pt) 2008-07-04 2009-06-30 instrumento de remoção e processo para remoção de uma camada metálica eletrodepositada a partir de uma placa de cátodo
EP09772417A EP2318571B1 (en) 2008-07-04 2009-06-30 Stripping apparatus and method for removing an electrodeposited metal layer from a cathode plate
AU2009265804A AU2009265804B2 (en) 2008-07-04 2009-06-30 Stripping apparatus and method for removing an electrodeposited metal layer from a cathode plate
ES09772417T ES2390007T3 (es) 2008-07-04 2009-06-30 Método y aparato de decapado para retirar una capa metálica electrodepositada de una placa catódica

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08159745A EP2141265A1 (en) 2008-07-04 2008-07-04 Stripping apparatus and method for removing an electrodeposited metal layer from a cathode plate

Publications (1)

Publication Number Publication Date
EP2141265A1 true EP2141265A1 (en) 2010-01-06

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ID=40032513

Family Applications (2)

Application Number Title Priority Date Filing Date
EP08159745A Withdrawn EP2141265A1 (en) 2008-07-04 2008-07-04 Stripping apparatus and method for removing an electrodeposited metal layer from a cathode plate
EP09772417A Active EP2318571B1 (en) 2008-07-04 2009-06-30 Stripping apparatus and method for removing an electrodeposited metal layer from a cathode plate

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP09772417A Active EP2318571B1 (en) 2008-07-04 2009-06-30 Stripping apparatus and method for removing an electrodeposited metal layer from a cathode plate

Country Status (6)

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EP (2) EP2141265A1 (es)
CN (1) CN102084036B (es)
AU (1) AU2009265804B2 (es)
BR (1) BRPI0915708B1 (es)
ES (1) ES2390007T3 (es)
WO (1) WO2010000717A2 (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102146572A (zh) * 2011-01-29 2011-08-10 湖南江冶机电科技有限公司 海绵铅成型生产线
WO2017144740A1 (es) * 2016-02-25 2017-08-31 Yves Lefevre Máquina de arrancado de cátodos
CN110408962A (zh) * 2019-09-16 2019-11-05 宜昌市烨赫机械制造有限公司 一种用于剥离阴极板上电解锰的装置及方法

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CN103388162B (zh) * 2013-08-09 2015-09-30 赤峰云铜有色金属有限公司 种板剥离机组
CN104499005B (zh) * 2014-12-04 2017-02-22 株洲优瑞科有色装备有限公司 剥锌后机器人剔板、补板、转运装置及方法及剥锌生产线
CN104357882B (zh) * 2014-12-09 2016-09-07 株洲优瑞科有色装备有限公司 用于阴极板金属层的快速剥离装置及剥离设备及剥离方法
CN104762640B (zh) * 2015-04-28 2017-11-21 北京矿冶研究总院 电沉积金属预剥离装置
CN105926009B (zh) * 2016-05-30 2018-01-30 北矿机电科技有限责任公司 阴极板间距调整装置及调整方法
CN106591895A (zh) * 2016-12-15 2017-04-26 天津鑫胜宏塔新材料科技有限公司 一种电解铜粉刮板装置
CN107699924B (zh) * 2017-11-13 2024-04-02 温岭市忠盛金属材料有限公司 一种碱性电解金属锌粉中的阴极板剥离金属锌粉设备
CN109487304B (zh) * 2018-11-30 2023-09-08 江西创恩机械设备有限公司 阴极板剥片设备
CN109853005B (zh) * 2019-04-08 2019-12-27 林时本 一种电解铜生产用铜板刮粉装置及其使用方法
CN112210800B (zh) * 2019-07-12 2023-08-25 莱昂·克罗塞特 包括预剥离设备的电解沉积生产线
CN112210799B (zh) * 2019-07-12 2023-06-23 莱昂·克罗塞特 包括运输阴极板和阳极板的升降设备的电解沉积生产线

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US1553080A (en) 1921-11-25 1925-09-08 Us Metals Refining Company Automatic stripping machine
US3625806A (en) 1968-01-30 1971-12-07 Olov Carl Gustav Wennberg Machine for stripping off the copper coating from a basic plate for the production of start sheets for electrolytic refinement of copper
US3689396A (en) 1969-11-10 1972-09-05 Monteponi & Montevecchio Spa Apparatus for stripping metal layers from metallic supports
US3772003A (en) 1972-02-07 1973-11-13 J Gordy Process for the electrolytic recovery of lead, silver and zinc from their ore
US3847779A (en) 1972-10-26 1974-11-12 Dowa Mining Co Automatic apparatus for stripping deposited metal from a cathode plate in electrowinning process
US3996127A (en) 1973-10-17 1976-12-07 Outokumpu Oy Device for detaching an electrolytically precipitated metal sheet from a cathode
JPS5518584B2 (es) 1976-05-17 1980-05-20
US4209379A (en) * 1979-06-18 1980-06-24 Texasgulf Canada Ltd. Cathode stripping system
US4273640A (en) 1977-12-22 1981-06-16 Ross Richard H C Leb Zinc extraction apparatus
JPS62224694A (ja) 1986-03-26 1987-10-02 Mitsubishi Metal Corp カソ−ド析出物の剥離方法および装置
US4806213A (en) 1986-10-03 1989-02-21 Outokumpu Oy Method and apparatus for stripping electrolytic precipitate from supporting structures
EP0436602A1 (en) 1988-09-27 1991-07-17 Kodak Ag METAL RECOVERY DEVICE.
EP0470033A2 (en) 1990-08-01 1992-02-05 Asturiana De Zinc, S.A. Installation for removing the zinc deposited by electrolysis on aluminium plates
EP0482258A1 (en) 1990-10-25 1992-04-29 Falconbridge Limited Cathode stripping apparatus
US5565083A (en) 1990-12-31 1996-10-15 Electric Fuel (E.F.L.) Ltd. Process and scraper for removing deposits from an electrode
JP3138388B2 (ja) 1994-07-27 2001-02-26 株式会社不二工機 温度膨張弁
WO2002097170A2 (en) 2001-05-30 2002-12-05 Aisco Systems, Inc. Mobile zinc cathode stripping system
US20070272561A1 (en) 2004-08-27 2007-11-29 Bengt Mornholm Device and Method for Handling Metal Sheets

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FI982569A (fi) * 1998-11-27 2000-05-28 Outokumpu Oy Laite metallisaostuman erottamiseksi katodilta
FI108048B (fi) * 1999-06-10 2001-11-15 Outokumpu Oy Laite elektrolyyttisessä puhdistuksessa syntyneen saostuman irrottamiseksi
AU2004314225B2 (en) * 2004-01-21 2010-04-01 Falconbridge Limited Method and apparatus for stripping electrodeposited metal sheets from permanent cathodes

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1553080A (en) 1921-11-25 1925-09-08 Us Metals Refining Company Automatic stripping machine
US3625806A (en) 1968-01-30 1971-12-07 Olov Carl Gustav Wennberg Machine for stripping off the copper coating from a basic plate for the production of start sheets for electrolytic refinement of copper
US3689396A (en) 1969-11-10 1972-09-05 Monteponi & Montevecchio Spa Apparatus for stripping metal layers from metallic supports
US3772003A (en) 1972-02-07 1973-11-13 J Gordy Process for the electrolytic recovery of lead, silver and zinc from their ore
US3847779A (en) 1972-10-26 1974-11-12 Dowa Mining Co Automatic apparatus for stripping deposited metal from a cathode plate in electrowinning process
US3996127A (en) 1973-10-17 1976-12-07 Outokumpu Oy Device for detaching an electrolytically precipitated metal sheet from a cathode
JPS5518584B2 (es) 1976-05-17 1980-05-20
US4273640A (en) 1977-12-22 1981-06-16 Ross Richard H C Leb Zinc extraction apparatus
US4209379A (en) * 1979-06-18 1980-06-24 Texasgulf Canada Ltd. Cathode stripping system
JPS62224694A (ja) 1986-03-26 1987-10-02 Mitsubishi Metal Corp カソ−ド析出物の剥離方法および装置
US4806213A (en) 1986-10-03 1989-02-21 Outokumpu Oy Method and apparatus for stripping electrolytic precipitate from supporting structures
EP0436602A1 (en) 1988-09-27 1991-07-17 Kodak Ag METAL RECOVERY DEVICE.
EP0470033A2 (en) 1990-08-01 1992-02-05 Asturiana De Zinc, S.A. Installation for removing the zinc deposited by electrolysis on aluminium plates
EP0482258A1 (en) 1990-10-25 1992-04-29 Falconbridge Limited Cathode stripping apparatus
US5565083A (en) 1990-12-31 1996-10-15 Electric Fuel (E.F.L.) Ltd. Process and scraper for removing deposits from an electrode
JP3138388B2 (ja) 1994-07-27 2001-02-26 株式会社不二工機 温度膨張弁
WO2002097170A2 (en) 2001-05-30 2002-12-05 Aisco Systems, Inc. Mobile zinc cathode stripping system
US20070272561A1 (en) 2004-08-27 2007-11-29 Bengt Mornholm Device and Method for Handling Metal Sheets

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102146572A (zh) * 2011-01-29 2011-08-10 湖南江冶机电科技有限公司 海绵铅成型生产线
WO2017144740A1 (es) * 2016-02-25 2017-08-31 Yves Lefevre Máquina de arrancado de cátodos
CN110408962A (zh) * 2019-09-16 2019-11-05 宜昌市烨赫机械制造有限公司 一种用于剥离阴极板上电解锰的装置及方法

Also Published As

Publication number Publication date
WO2010000717A3 (en) 2010-04-22
BRPI0915708A2 (pt) 2015-10-27
AU2009265804B2 (en) 2014-06-26
CN102084036A (zh) 2011-06-01
WO2010000717A2 (en) 2010-01-07
EP2318571B1 (en) 2012-06-20
CN102084036B (zh) 2014-02-12
EP2318571A2 (en) 2011-05-11
BRPI0915708B1 (pt) 2019-11-05
ES2390007T3 (es) 2012-11-05
AU2009265804A1 (en) 2010-01-07

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