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Recovery of pickling effluents by electrochemical oxidation of ferrous to ferric chloride

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Abstract

The characteristics of the effluents from the preparatory pickling step of zinc plating are presented and the various methods of oxidizing ferrous to ferric chloride are briefly considered. An electrochemical oxidation method is proposed to recover these effluents by using an electrochemical cell with three-dimensional electrodes and an anion selective membrane. A near exhausted hydrochloric acid solution was used as catholyte. The experimental data obtained from the proposed cell show a faradic yield of 100% and easy control of the parasitic reactions. The three-dimensional anode was modelled and it is shown that at high values of current only the felt entrance region works efficiently.

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Abbreviations

A :

membrane surface (cm2)

a :

specific felt surface (cm−1)

ΔC :

concentration difference (mol dm-−3)

D :

average diffusion coefficient through the membrane (cm2 s−1)

i n :

felt wall flux of species (mol cm−2 s−1)

j :

total current density (A cm−2)

j 0 :

exchange current density (A cm−2)

j 1 :

current density in matrix (A cm−2)

j 2 :

current density in felt solution (A cm−2)

j n :

transfer current density (A cm−2)

L :

thickness of felt electrode (cm)

L m :

thickness of membrane (cm)

M :

transport of ferrous and ferric ions through the membrane (mol)

N :

superficial flux of ion reactant (mol cm−2 s−1)

u :

superficial fluid velocity (cm s−1)

x :

distance through felt electrode (cm)

R :

universal gas constant (8.3143 J mol−1 K−1)

T :

absolute temperature (K)

t :

time (s)

αa, αc :

anodic and cathodic transfer coefficient

η:

local overpotential (η = Φ1 − Φ2) (V)

κ:

conductivity of solution (mS cm−1)

µ:

solution viscosity (Pa s)

ϱ:

solution density (g cm−3)

σ:

conductivity of solid matrix (mS cm−1)

Φ1 :

electrostatic potential in matrix phase (V)

Φ2 :

electrostatic potential in solution (V)

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Authors and Affiliations

  1. Dipartimento di Ingegneria Chimica, Chimica Industriale e Scienza dei Materiali, Università di Pisa, via Diotisalvi 2, 56100, Pisa, Italy

    P. F. Marconi, V. Meunier & N. Vatistas

Authors
  1. P. F. Marconi
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  2. V. Meunier
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  3. N. Vatistas
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Marconi, P.F., Meunier, V. & Vatistas, N. Recovery of pickling effluents by electrochemical oxidation of ferrous to ferric chloride. J Appl Electrochem 26, 693–701 (1996). https://doi.org/10.1007/BF00241510

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  • DOI: https://doi.org/10.1007/BF00241510

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