Skip to main content
Log in

Fluidized bed electrodes Part IV. Electrodeposition of copper in a fluidized bed of copper-coated spheres

  • Papers
  • Published:
Journal of Applied Electrochemistry Aims and scope Submit manuscript

Abstract

The effective resistivity of the discontinuous metal phase in a fluidized bed copper electrode is derived from measurements of the potential distribution in the solution. The values are similar to those which have been previously observed for a fluidized bed of silver-coated particles and are compared with a theoretical expression based on a model of charge sharing during single particle elastic collisions. It is shown that the metal resistivity follows the predicted dependence on bed expansion and solution resistivity; the constant of proportionality is, however, different and this is attributed to a stagnation zone close to the feeder electrode. Such a stagnant zone is also indicated by comparison of the experimental and theoretically predicted distribution of potential in the metal phase.

The diffusion controlled removal of copper from 10−4 M copper sulphate is also shown to follow the theoretically predicted behaviour; the mass transfer coefficient indicates a high degree of turbulence within the bed. It is shown that scale-up factors of the order of 300 can be achieved in the processing of such dilute solutions. In view of the relatively high resistivity of the metal phase it is suggested that practical systems would arrange for a current and fluid flow to be at right angles to each other.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

Abbreviations

A :

surface area per unit volume of electrode (cm−1)

C :

double layer capacity (Farads cm−2)

c 0 :

concentration (moles cm−3)

D :

diffusion coefficient (cm2 s−1)

F :

the Faraday (coulombs mole−1)

I :

total current (A cm−2)

i :

local current density (A cm−2)

i o :

exchange current density (A cm−2)

K m :

mass transfer coefficient (cm s−1)

n :

equivalents per mole

R :

gas constant (volt coulomb deg−1 mole−1)

r :

particle radius (cm)

T :

absolute temperature

u :

superficial solution velocity (cm s−1)

V :

voidage

v p :

mean particle velocity (cm s−1)

x :

distance from feeder in direction of current flow (cm)

α :

electrochemical transfer coefficient for an anodic reaction

γ :

Young's modulus (dynes cm−2)

δ :

Solution-metal diffusion layer thickness (cm)

ε :

electrode length normalized w.r.t. the static bed length

η :

local overpotential (volts)

λ :

characteristic length (cm)

π :

solution-particle density difference (g cm−3)

π m :

effective specific resistivity of the discontinuous metal phase (ω cm)

π s :

effective specific resistivity of the solution phase (ω cm)

φ m :

metal potential (volts)

φ s :

solution potential (volts)

References

  1. British Patent 1,194,181.

  2. New Scientist,37 (1968) 303.

  3. F. R. Backhurst, F. Goodridge, R. E. Plimley, and M. Fleischmann,Nature,221 (1969) 55.

    Google Scholar 

  4. J. N. Hiddleston and A. F. Douglas,Nature,218 (1968) 601.

    Google Scholar 

  5. R. D. Armstrong, O. R. Brown, R. D. Giles, and J. A. Harrison,Nature,219 (1968) 94.

    Google Scholar 

  6. T. Berent, I. Fells and R. Mason,Nature,223 (1969) 1054.

    Google Scholar 

  7. J. R. Backhurst, J. M. Coulson, M. Fleischmann, F. Goodridge, and R. E. Plimley,J. Electrochem. Soc.,116 (1969) 1600.

    Google Scholar 

  8. M. Fleischmann and J. W. Oldfleld,J. Electroanal. Chem., in press.

  9. J. S. Newman and C. W. Tobias,J. Electrochem. Soc.,109 (1962) 1183.

    Google Scholar 

  10. E. A. Grenns II and C. W. Tobias,Electrochimica Acta,10 (1968) 761.

    Google Scholar 

  11. M. Fleischmann and J. W. Oldfield,J. Electroanal. Chem., in press.

  12. M. Fleischmann, J. W. Oldfield, and D. F. Porter,J. Electroanal. Chem., in press.

  13. O. R. Brown and H. R. Thirsk,Electrochimica Acta,10 (1965) 383.

    Google Scholar 

  14. E. Mattson and J. O'M Bockris,Trans Farad. Soc.,55 (1959) 1586.

    Google Scholar 

  15. R. Belcher and A. M. Cabrera,Anales. Real. Soc. Espan. Fisquim,54(5) (1963) 281.

    Google Scholar 

  16. V. I. Shorokhova and L. I. Kuzmin,Int. Chem. Eng.,4 (1969) 451.

    Google Scholar 

  17. N. Ibl and K. Schadegg,J. Electrochem. Soc.,114 (1967) 54.

    Google Scholar 

  18. L. Tennakoon, unpublished data.

Download references

Author information

Authors and Affiliations

Authors

Rights and permissions

Reprints and permissions

About this article

Cite this article

Fleischmann, M., Oldfield, J.W. & Tennakoon, L. Fluidized bed electrodes Part IV. Electrodeposition of copper in a fluidized bed of copper-coated spheres. J Appl Electrochem 1, 103–112 (1971). https://doi.org/10.1007/BF01111857

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF01111857

Keywords

Navigation