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Ce travail a pour objectif d’appliquer la technique d’electrodialyse a l’epuration d’une solution synthetique d’acide sulfurique chargee en cations Fe (II), dont la composition est proche a celle d’un bain acide use. L’etude a ete menee sur une solution synthetique d’acide sulfurique contenant du Fe(II) comme impurete metallique. L’influence de quelques parametres tels que la densite de courant, le debit, la nature de la membrane, la concentration de l’acide (H 2 SO 4 ) et la temperature sur l’efficacite d’elimination de Fe(II) a ete etudiee. Les resultats obtenus montrent que le taux d’epuration de l’acide sulfurique augmente avec la densite de courant, le debit de circulation de la solution et la temperature et diminue avec l’augmentation de la concentration de l’acide de la solution a traiter. Cette etude a permis de montrer qu’il est possible, sous les conditions operatoires suivantes: CMX ; 20 mA.cm -2 ; 25°C ; 7 h, d’epurer a 66,32% par electrodialyse une solution acide sulfurique contaminee par les ions Fe (II). Mots cles: decapage chimique- electrodialyse –membrane – epuration - acide sulfurique. Elimination by electrodialysis of Fe (II) ions with a sulfuric acid solution This work was aimed at applying the electrodialysis technique for the purification of a synthetic solution of sulfuric acid charged by cations of Fe(II), where the composition content is close to that of reel industrial acid bath. The study was conducted on a synthetic solution of sulfuric acid containing Fe(II) as a metal impurity. The influence of some parameters such as current density, flow, nature of the membrane, the concentration of acid (H 2 SO 4 ) and the temperature on the removal efficiency of Fe (II) was studied. The results obtained showed that the treatment rate of the sulfuric acid increases with the current density of the solution circulating flow rate and temperature and decreases with increasing acid concentration of the solution to be treated. In conclusion this study has shown the possibility, under the following operating conditions: CMX; 20 mA.cm -2 ; 25°C; 7 h, to purify the sulfuric acid solution contaminated by Fe (II) with a rate of around 66.32% by electrodialysis Keywords: pickling- electrodialysis- membrane – purification - sulfuric acid.

synthèse

Elimination par Électrodialyse des Ions Fe ( II ) d’une Solution d’Acide Sulfurique = Elimination by Electrodialysis of Fe ( II ) Ions with a Sulfuric Acid Solution