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Improvement of the performance of porous electrodes using ionic conducting particles: Application to silver recovery

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Abstract

Experimental measurements are reported for a complex conducting porous electrode system consisting of electronic and ionic conducting particles. A very large value of the ionic conductivity within the electrode is its main characteristic. The complex conducting electrodes and traditional graphitic granular electrodes were used separately to recover silver from a silver plating rinse water. The former displayed excellent performance. A packed-bed reactor composed of the complex conducting electrodes has been successfully tested on a plating line.

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Abbreviations

a :

specific interfacial area of the electrode bed

c :

concentration of reactants

c o :

initial concentration of reactants

F :

Faraday constant

I :

cell current

i 0 :

exchange current density

L :

thickness of electrode bed

p :

electric power

Q :

volume flow rate

R :

universal gas constant

r :

percentage recovery of silver

s :

space velocity (i.e. the number of dm3 solution per dm3 volume of electrode per hour)

S :

normalized space velocity (i.e. the number of dm3 solution whose concentration could be reduced tenfold per dm3 volume of electrode per hour)

T :

absolute temperature

U :

cell voltage

αa :

transfer coefficient for anode

αc :

transfer coefficient for cathode

ε:

porosity or void fraction of bed

ɛ:

average current efficiency

k :

effective conductivity of solution

\(\bar \eta \) :

intrinsic conductivity of solution

ν:

square root of dimensionless exchange current

δ:

effective conductivity of conducting solid matrix

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Authors and Affiliations

  1. The Eleventh Design & Research Institute of the Ministry of Electronic Industry, P. O. Box 107, Mianyang, Sichuan, People's Republic of China

    Yang Bingkun

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  1. Yang Bingkun
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Bingkun, Y. Improvement of the performance of porous electrodes using ionic conducting particles: Application to silver recovery. J Appl Electrochem 20, 974–977 (1990). https://doi.org/10.1007/BF01019574

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  • DOI: https://doi.org/10.1007/BF01019574

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