Classifications

• • 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
• • 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
  • C25C7/002—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells of cells comprising at least an electrode made of particles
• • 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
  • C25C7/007—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells of cells comprising at least a movable electrode

Definitions

• the present invention concerns a process for electrolysis wherein there is used a movable electrode in addition to one loose and freely moving solid medium present in the electrode, and a device for performing the process.
• anode at such electrolysis is placed inside a rotatable, for instance cylindrical, cathode, it might be expected that the cathode gradually would grow solid and become useless from the deposited metal.
• a freely movable, solid medium inside the cathode drum may inter alia comprise metal particles or -spheres of the same metal as in the electrolyte, or of another conducting or non-conducting or inert material.
• a freely movable medium may inter alia comprise metal particles or -spheres of the same metal as in the electrolyte, or of another conducting or non-conducting or inert material.
• sepa ⁇ rated material will be deposited on the inner medium (spheres) and not on the cathode surface.
• the free, solid medium inside the cathode drum need not necessarily be round or sperical, but can have any shape which accomplishes the above mentioned effects, and which makes the metal deposit on the particle surface of the medium.
• the medium inside the the rotating or otherwise movable, f.ex. shaking or vibrating, cathode also may comprise other devices, f.ex. scrapes or knives, which accomplishes a similar effect as the above mentioned solid medium.
• an electrolyte optionall containing free particles of solid medium
• Fig. 1 shows a cathode drum with anode discs therein reaching down into the electrolyte.
• Fig. 2 shows a cathode drum as in fig. 1, but seen from the side and with marked roll bearings.
• Fig. 3 shows another embodiment of a drum cathode which i ⁇ shown in fig. 1, but where the anode comprises an anode tube with holes for adding and discharging electrolyte and gasses
• Fig. 4 shows an additional embodiment of a cathode drum, where the drum is placed obliquely for suitable sedimentatio of the particle material, and where the anode tube is sur ⁇ rounded by a non-conducting sheet for refining electrolysis.
• a suited device for performing the electrolysis according to the present invention is shown in fig. 1 and 2, wherein the rotating cathode drum 1 with electrically isolated end plates 2 is suspended on roll bearings 3.
• the penetrating anode comprises a conducting anode rod 4 with anode plates 5, optionally made of lead or some other siuted material, hanging down into the electrolyte.
• the anode rod is connect to a positive terminal of a not shown current source.
• the freely movable, particulate medium inside the rotatable end rotating cathode drum 1, is given by the reference number 7.
• the particle material does not have any direct contact with the anode plate 5.
• Electrolyte 8 which electrolyte may be drained, optionall together with produced silt and/or waste material, through a drinage opening 10, where the elctrolyte which is drained at 10 is poor in the current cation which is being electro ⁇ lysed.
• Electrolyte for electrolysis, and possibly containing particulate solid medium, is supplied at 9, and the drum cathode 1 is connected to a negative terminal of a not shown current scource at 11, f.ex. inter a/lia through a sliding connection .
• the direction of rotation for the cathode drum is given by outer arrows i fig. 2, and the current movement of the particulate medium is given by inner arrows in fig. 2.
• Another possible embodiment of the device according to the invention is where the side walls 2 are removed, and where the particulate material may migrate towards the open ends of the cathode drum 1, and from there be taken out during rotation or shaking/vibrating of the cathode drum.
• FIG. 3 Another embodiment of the device according to the present invention is depicted in fig. 3, where each part is provided with the same reference numbers as in figs. 1 and 2, but where the anode does not encompass anode plates, but only a tube which is perforated, and where the electrolyte solution stands in direct contact with the tube 4.
• This embodiment makes it simple to remove produced gass by suction or blowing at 10.
• FIG. 4 Yet another device for performing the process by electro- lysis according to the invention is given in fig. 4, wherein the anode tube 4 is perforated here as well, but where the middle anode section 16-17 is provided with a non ⁇ conducting cloth 18 and where this section 14 has separate supplying devices 13 and exit devices 15 for particulate material, silt and solutions.
• suc a device may be used for refining of metals or electrolysis where so- called red/ox-pairs are present, such as in f.ex.
• the purpose for this experiment vas to determine the effect of the process according to the invention during production of metal, i.e. to determine whether metal did not deposit on the cathode walls but on the particulate material in the cathode drum only.
• the anode comprised in this trial 19 lead anode plates with a mutual distance of 5 cm inside the cathode drum.
• the electrolysis device was mounted on rolls, and a variable motor rotated the drum with 17 rpm while the anode was stationary.
• the device was heated by help of heating cables placed around the drum (2 x 400 W) and received their energy via two sliding contacts of 220 V.
• a contact thermostate regulated the temperature with 5 C accuracy.
• the positive end of a rectifier was connected to the anode rod which protruded from openings in the end walls of the cathode drum.
• the negative pole was connected to a 5 mm lead plate which slided against teh rotating cylinder and was kept in place by a spring, somehting which gave good contact without tendencies to spark production.
• the system coud withstand 200 A. Elelctrolyte was supplied through the one end of the cathode drum, and drained from the other end. Current was supplied when the working temperature was reached while the drum rotated continously. 5 Continous repacement of the particulate medium was not performed in htis experiment, and the particles were allowed to grow. The experiment was done during 9k hours at only 25-28 C by using 60 A. This gave a current density of
• the current density was increased to 800 A/m , while the temperature was kept to 55-60°C with a supply of 32 g/1 Cu.
• the trial was performed with a cell voltage of 3,0-3,6 V,
• Experiment 5 shows as in experiment 4 that the drained solution contains very little metal ions, and that the selectivity for depositing copper against antimony and arsenic is very good. Table 5.

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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)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Discharge Heating (AREA)

Applications Claiming Priority (4)

Publications (1)

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• 1987
  • 1987-06-05 NO NO872388A patent/NO164921C/no unknown
• 1988
  • 1988-01-08 WO PCT/NO1988/000002 patent/WO1988009399A1/en not_active Ceased
  • 1988-01-08 EP EP88900854A patent/EP0319552A1/de not_active Withdrawn
  • 1988-01-08 AU AU11554/88A patent/AU598097B2/en not_active Ceased
  • 1988-01-08 JP JP63501054A patent/JPH01501951A/ja active Pending
  • 1988-04-04 MX MX010977A patent/MX170337B/es unknown
  • 1988-05-26 CA CA000567777A patent/CA1335435C/en not_active Expired - Fee Related
  • 1988-05-26 CN CN198888103116A patent/CN88103116A/zh active Pending
• 1989
  • 1989-01-24 FI FI890338A patent/FI88178C/fi not_active IP Right Cessation

Non-Patent Citations (1)

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