WO2010000717A2 - Dispositif de décapage et procédé pour éliminer une couche de métal déposée électrolytiquement à partir d'une plaque de cathode - Google Patents

Dispositif de décapage et procédé pour éliminer une couche de métal déposée électrolytiquement à partir d'une plaque de cathode Download PDF

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Publication number
WO2010000717A2
WO2010000717A2 PCT/EP2009/058149 EP2009058149W WO2010000717A2 WO 2010000717 A2 WO2010000717 A2 WO 2010000717A2 EP 2009058149 W EP2009058149 W EP 2009058149W WO 2010000717 A2 WO2010000717 A2 WO 2010000717A2
Authority
WO
WIPO (PCT)
Prior art keywords
cathode
carousel
stripping
cathode plate
knives
Prior art date
Application number
PCT/EP2009/058149
Other languages
English (en)
Other versions
WO2010000717A3 (fr
Inventor
Léon Crosset
Original Assignee
Technic-One
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 filed Critical Technic-One
Priority to CN200980125584.2A priority Critical patent/CN102084036B/zh
Priority to AU2009265804A priority patent/AU2009265804B2/en
Priority to BRPI0915708-5A priority patent/BRPI0915708B1/pt
Priority to ES09772417T priority patent/ES2390007T3/es
Priority to EP09772417A priority patent/EP2318571B1/fr
Publication of WO2010000717A2 publication Critical patent/WO2010000717A2/fr
Publication of WO2010000717A3 publication Critical patent/WO2010000717A3/fr

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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.
  • the refined metal is recovered in the shape of sheets and is conveyed away for further processing, while the scraped electrode plates are removed, their surfaces cleaned and are returned to the electrodeposition unit.
  • a coated plate is lifted out of an electrolytic cell and as it is being lifted is engaged in a stripping device comprising fixed blades.
  • the relative movement of the raising cathode and the fixed knives causes the removal of the metal deposit from the surface of the cathode.
  • the relative movement of the stripping blades and the interface between the cathode and the metal coating consists of mobile blades running over the surface of a fixed cathode (cf. e.g., US 4,806,21 3).
  • US 3,996,1 27 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:
  • a feeding zone comprising a conveyor to convey coated cathode plates arranged in a face to face relationship to,
  • a metal stripping unit wherein the electrodeposited metal is stripped off the two main surfaces of the cathode plates with two knives;
  • first engaging means face the end of the conveyor feeding line so as to pivotally engage the first coated cathode plate present on said line;
  • 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 (l )-(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.
  • Figure 1 side view of a preferred stripping apparatus at a first stage, wherein a first cathode plate on the conveyor is engaged onto the carousel;
  • Figure 2 side view of a preferred stripping apparatus at a second stage, wherein the first cathode plate on the conveyor is being driven to the stripping unit by rotation of the carousel, and the scissor-like frame is open;
  • Figure 3 side view of a preferred stripping apparatus at a third stage, wherein the first cathode plate is at the stripping unit, the scissor-like frame is closed and the stripping knives in contact with the main surfaces of the cathode;
  • Figure 4 side view of a preferred stripping apparatus at a fourth stage, wherein the stripping knives are driven down along the interface between the cathode and the metal coating thus separating it from the cathode surfaces;
  • Figure 5 side view of a preferred stripping apparatus at a fifth stage, wherein the stripping knives are driven up again and the stripped metal sheet is collected by the guiding means;
  • Figure 6 front view of a preferred stripping apparatus at said third stage. Detailed description of the invention
  • the stripping apparatus of the present invention comprises four main sections: (a) a conveyor (1 0), (b) a stripping unit (1 1 ), (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 (1 2) and the next coated cathode plate (63) is being transferred from the conveyor (1 1 ) to the pair of slots (5).
  • clamping means (1 3) 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 (1 2).
  • 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 (1 1 ).
  • a simple and efficient alignment means (1 5) consists of curved handles positioned in the inner side of the carousel's walls, vis-a-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 (1 1 ).
  • 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 (1 4) 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 (1 2) 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.

Abstract

L'invention concerne un dispositif et un procédé pour éliminer une couche de métal déposée électrolytiquement à partir d'une plaque de cathode, qui comprend une zone d'alimentation, une unité de décapage de métal, une zone de décharge et un carrousel présentant un axe de rotation sensiblement horizontal et qui comprend des moyens de contact, de sorte que: (1) dans une première position, des premiers moyens de contact se situent face à l'extrémité de la chaîne d'alimentation d'un convoyeur afin d'entrer en contact pivotant avec la première plaque de cathode revêtue présente sur ladite chaîne; (2) dans une deuxième position, ladite première cathode est amenée en position dans l'unité de décapage par rotation du carrousel, pendant qu'une deuxième cathode revêtue vient en contact avec les moyens de contact suivants du carrousel; et (3) dans une troisième position, la première plaque de cathode décapée est déchargée sur la zone de décharge par une rotation supplémentaire du carrousel pendant que la deuxième cathode est amenée en position dans l'unité de décapage, et une troisième cathode revêtue vient en contact avec les moyens de contact suivants se situant face à la chaîne d'alimentation du convoyeur.
PCT/EP2009/058149 2008-07-04 2009-06-30 Dispositif de décapage et procédé pour éliminer une couche de métal déposée électrolytiquement à partir d'une plaque de cathode WO2010000717A2 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
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
AU2009265804A AU2009265804B2 (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
ES09772417T ES2390007T3 (es) 2008-07-04 2009-06-30 Método y aparato de decapado para retirar una capa metálica electrodepositada de una placa catódica
EP09772417A EP2318571B1 (fr) 2008-07-04 2009-06-30 Appareil de décapage et procédé d'enlèvement d'une couche de métal déposée par voie galvanique à partir d'une plaque de cathode

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP08159745.2 2008-07-04
EP08159745A EP2141265A1 (fr) 2008-07-04 2008-07-04 Appareil de décapage et procédé d'enlèvement d'une couche de métal déposée par voie galvanique à partir d'une plaque de cathode

Publications (2)

Publication Number Publication Date
WO2010000717A2 true WO2010000717A2 (fr) 2010-01-07
WO2010000717A3 WO2010000717A3 (fr) 2010-04-22

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PCT/EP2009/058149 WO2010000717A2 (fr) 2008-07-04 2009-06-30 Dispositif de décapage et procédé pour éliminer une couche de métal déposée électrolytiquement à partir d'une plaque de cathode

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

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CN107699924A (zh) * 2017-11-13 2018-02-16 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
CN109487304A (zh) * 2018-11-30 2019-03-19 丁慧 阴极板剥片设备
CN112210799A (zh) * 2019-07-12 2021-01-12 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
CN112210800A (zh) * 2019-07-12 2021-01-12 莱昂·克罗塞特 包括预剥离设备的电解沉积生产线

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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
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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
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
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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Publication number Priority date Publication date Assignee Title
CN107699924A (zh) * 2017-11-13 2018-02-16 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
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
CN109487304A (zh) * 2018-11-30 2019-03-19 丁慧 阴极板剥片设备
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
CN112210799A (zh) * 2019-07-12 2021-01-12 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
CN112210800A (zh) * 2019-07-12 2021-01-12 莱昂·克罗塞特 包括预剥离设备的电解沉积生产线
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

Also Published As

Publication number Publication date
CN102084036B (zh) 2014-02-12
BRPI0915708A2 (pt) 2015-10-27
EP2141265A1 (fr) 2010-01-06
BRPI0915708B1 (pt) 2019-11-05
AU2009265804B2 (en) 2014-06-26
CN102084036A (zh) 2011-06-01
ES2390007T3 (es) 2012-11-05
EP2318571B1 (fr) 2012-06-20
WO2010000717A3 (fr) 2010-04-22
AU2009265804A1 (en) 2010-01-07
EP2318571A2 (fr) 2011-05-11

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