EP0201837A1 - Verfahren Und Vorrichtung zum Regeln des Betriebspunktes einer Elektrolysezelle - Google Patents

Verfahren Und Vorrichtung zum Regeln des Betriebspunktes einer Elektrolysezelle Download PDF

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Publication number
EP0201837A1
EP0201837A1 EP86106133A EP86106133A EP0201837A1 EP 0201837 A1 EP0201837 A1 EP 0201837A1 EP 86106133 A EP86106133 A EP 86106133A EP 86106133 A EP86106133 A EP 86106133A EP 0201837 A1 EP0201837 A1 EP 0201837A1
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EP
European Patent Office
Prior art keywords
voltage
cell
current
periodic
cathode
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Granted
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EP86106133A
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English (en)
French (fr)
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EP0201837B1 (de
Inventor
René KODAK-PATHE Kaufmann
François KODAK-PATHE Mohier
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Kodak Pathe SA
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Kodak Pathe SA
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/02—Process control or regulation
    • 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

Definitions

  • the present invention relates to a method and a device for regulating the position of the operating point of an electrolysis cell and. more particularly, to such a method and such a device designed to maintain this operating point on a plate with a current-voltage characteristic of such a cell.
  • the recovery of the silver can also be carried out using cells with a porous, or volumetric, cathoae, such as those found in European Patent No. 37,325 issued in the name of Eastman Kodak Company.
  • the current-voltage characteristic of electrolysis has the appearance illustrated in FIG. 1A of the appended drawing. In this figure, it appears that this characteristic comprises an approximately rectilinear middle part, of slight slope, or "plateau". If the operating point is on the left of this plate, the electrolysis current is low and the electrolysis is slow. To the right of the plateau, the high relative intensity of the current causes the deposition on the electrodes of undesirable species such as silver sulphide. The best operating zone, from the point of view of the yield and the purity of the cathodic deposit, is therefore located on the current plateau, the intensity of the latter varying with the silver concentration of the electrolyzed fixer.
  • the present invention therefore aims to provide a method and a device for regulating the position of the operating point of a cell in which electrolysis of the current plate type described above takes place, which makes it possible to fix this point. in the best yield area. without using a reference electrode.
  • the method of the invention is a procedure for regulating the position of the operating bridge of a cell where electrolysis is carried out with current-voltage characteristic having a plate on which this point must be maintained. process by which a DC electrolysis voltage corresponding to a point on the plate is superimposed. a periodic tension of amplitude and shape. waveforms. We deduce from a possible deformation of the waveform of the periodic component of the cell output current, a drift of the operating point and we correct the DC supply voltage of the cell so as to reduce this drift and maintain the operating point of the cell on the platform.
  • the invention also makes it possible to produce a device for implementing this method, allowing the regulation of at least one anode-cathode voltage in a cell where electrolysis is carried out with current-voltage characteristic having a current plateau, of the type which comprises a) an electrical supply for establishing a stabilized DC voltage between the anode and the cathoce and b) a means for adjusting this voltage.
  • the device further comprises c) a source of periodic voltage auxiliary to the wire superimposing on the stabilized anode-cathode voltage a periodic voltage of determined amplitude and shape and (d) a regulator sensitive to the anode-cathode current to form a significant output signal of a difference between the waveform of the periodic comoosante of the anode-cathode current and that of the periodic voltage
  • FIG. 1 where there is shown in A the graph of the current-voltage characteristic of a cell with a porous cathode where electrolysis of silver salts takes place.
  • the operating point a of the cell be placed on the plateau of this characteristic, in its middle region.
  • advantage is taken of the non-linearity of the current-voltage characteristic to detect such drifts and to deduce therefrom a correction of the operating potential of the cell, capable of replacing the operating point of this cell in its position. the most favorable, namely the middle part of the plateau.
  • a periodic voltage of predetermined amplitude and waveform is superimposed on the operating voltage of the cell, the waveform of the periodic component is noted. of the cell current and the supply voltage of the cell is corrected as a function of the measured deformation of this waveform compared to that of the applied penetration voltage. so as to bring together the whole periodic excursion of tension on the characteristic olateau.
  • FIGS. 2, 3 and 4 show the means used, according to the present invention, to detect these deformations and to deduce therefrom a correction of the operating voltage of the cell.
  • FIG. 2 illustrates the general arrangement of the adjustment device according to the invention.
  • Electrodes 1,2 are immersed in a container 3 containing the solution 4 to be electrolyzed.
  • One of these electrodes is a porous cathode.
  • the electrodes 1,2 are connected to the terminals of a stabilized power supply 5.
  • the latter delivers an adjustable direct voltage established between the electrodes, as well as an adjustable periodic voltage having, for example, a triangular waveform.
  • This penetration voltage is supplied to the power supply 5 by a function generator 6.
  • the block diagram of the regulator is shown in FIG. 3. It includes first and second means (7, 8, 9, 10) and (11, 12) respectively, for forming signals in slots.
  • This signal B is then transformed into a slot signal C (FIG. 4), in a comparator 10, the other input of which is grounded, by detection of the passage of the signal to zero.
  • This slot signal has the same frequency as the starting signal A but its duty cycle is a function of the position of the cell operating point relative to the plateau of the current-voltage characteristic.
  • the modulation signal supplied by the function generator 6 is taken in the form of a signal A which is also amplified at 11 and processed at 12 with a comparator for detecting the passage of the signal at zero.
  • the signal in slots D obtained has, by definition, a duty cycle equal to 50%. Its amplitude is made equal to that of signal C by appropriate conventional means.
  • a comparator 13 forms a signal E corresponding to the difference of the signals in slots C and D.
  • this operating point has drifted towards one or the other of the ends of the plateau, it appears in the difference signal E series of pulses whose polarity is significant of the direction of the correction to be applied to the power supply 5 to bring the operating point of the cell back to the middle area of the plateau of the current-voltage characteristic.
  • pulses correctly amplified, supply an adjustment means such as a servomotor coupled to a potentiometer adjusting the operating point of the stabilized supply.
  • the regulation is then completely automatic.
  • FIG. 5 shows another embodiment of the invention suitable for regulating a multi-anode cell with a volume cathode.
  • this cell several anoaes 1 '. 1 ". 1" '. etc. are associated with a common 2 'cathode.
  • a generator of functions 6 ′ and a common stabilized power supply 5 ′ feed the anodes via regulators 7 ′. 7 ", 7" ', etc. according to the invention, which act separately on a separate anode, in order to polarize the latter optimally as a function of the local electrolysis conditions.
  • the present invention also finds application in other type of multi-electrode cells and in particular in those described in the aforementioned European patent n ° 37,325.
  • the present invention is applicable whenever the current-voltage characteristic of an electrolysis cell has a sufficiently large current plateau.

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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)
  • Automation & Control Theory (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
EP19860106133 1985-05-14 1986-05-05 Verfahren Und Vorrichtung zum Regeln des Betriebspunktes einer Elektrolysezelle Expired EP0201837B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8507269A FR2582022B1 (fr) 1985-05-14 1985-05-14 Procede et dispositif de regulation de la position du point de fonctionnement d'une cellule d'electrolyse
FR8507269 1985-05-14

Publications (2)

Publication Number Publication Date
EP0201837A1 true EP0201837A1 (de) 1986-11-20
EP0201837B1 EP0201837B1 (de) 1989-03-08

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Family Applications (1)

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EP19860106133 Expired EP0201837B1 (de) 1985-05-14 1986-05-05 Verfahren Und Vorrichtung zum Regeln des Betriebspunktes einer Elektrolysezelle

Country Status (3)

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EP (1) EP0201837B1 (de)
DE (1) DE3662279D1 (de)
FR (1) FR2582022B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0754780A1 (de) 1995-07-15 1997-01-22 Agfa-Gevaert N.V. Verfahren und Vorrichtung zur Entsilberung von Lösungen
US5759377A (en) * 1995-07-15 1998-06-02 Agfa-Gevaert Process for de-silvering of a silver-containing solution
EP0999296A2 (de) * 1998-09-04 2000-05-10 Gebr. Schmid GmbH & Co. Einrichtung zum Abtrag einer Beschichtung von Gegenständen
US6187167B1 (en) 1998-07-13 2001-02-13 Eastman Kodak Company Recovery of metal from solution
US6207037B1 (en) 1998-07-13 2001-03-27 Eastman Kodak Company Recovery of metal from solution
WO2006105981A2 (en) * 2005-04-07 2006-10-12 Industrie De Nora S.P.A. Method for electrochemical deposition of metals

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013213982A1 (de) * 2013-07-17 2015-03-12 Bayer Materialscience Ag Verfahren und System zur Überwachung der Funktionsfähigkeit von Elektrolysezellen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2296705A1 (fr) * 1974-12-30 1976-07-30 Solvay Procede et dispositif pour deceler un contact entre une anode et la cathode d'une cellule a mercure
US4263108A (en) * 1980-03-27 1981-04-21 Foresight Enterprises, Incorporated Control system for the electrolytic recovery of silver from photographic fixing solution
EP0035008A2 (de) * 1980-02-21 1981-09-02 Esterol A.G. Verfahren und Apparat zur Aufbereitung photographischer Lösungen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2296705A1 (fr) * 1974-12-30 1976-07-30 Solvay Procede et dispositif pour deceler un contact entre une anode et la cathode d'une cellule a mercure
EP0035008A2 (de) * 1980-02-21 1981-09-02 Esterol A.G. Verfahren und Apparat zur Aufbereitung photographischer Lösungen
US4263108A (en) * 1980-03-27 1981-04-21 Foresight Enterprises, Incorporated Control system for the electrolytic recovery of silver from photographic fixing solution

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0754780A1 (de) 1995-07-15 1997-01-22 Agfa-Gevaert N.V. Verfahren und Vorrichtung zur Entsilberung von Lösungen
US5759377A (en) * 1995-07-15 1998-06-02 Agfa-Gevaert Process for de-silvering of a silver-containing solution
US6187167B1 (en) 1998-07-13 2001-02-13 Eastman Kodak Company Recovery of metal from solution
US6207037B1 (en) 1998-07-13 2001-03-27 Eastman Kodak Company Recovery of metal from solution
EP0999296A2 (de) * 1998-09-04 2000-05-10 Gebr. Schmid GmbH & Co. Einrichtung zum Abtrag einer Beschichtung von Gegenständen
EP0999296A3 (de) * 1998-09-04 2000-12-13 Gebr. Schmid GmbH & Co. Einrichtung zum Abtrag einer Beschichtung von Gegenständen
WO2006105981A2 (en) * 2005-04-07 2006-10-12 Industrie De Nora S.P.A. Method for electrochemical deposition of metals
WO2006105981A3 (en) * 2005-04-07 2007-07-12 De Nora Elettrodi Spa Method for electrochemical deposition of metals

Also Published As

Publication number Publication date
FR2582022B1 (fr) 1988-02-19
EP0201837B1 (de) 1989-03-08
FR2582022A1 (fr) 1986-11-21
DE3662279D1 (en) 1989-04-13

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