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    STUDIA CHEMIA - Issue no. 2, Tom II / 2019  
         
  Article:   SENSORS ARRAY FOR MONITORING AND AUTOMATION OF THE ELECTROCHEMICAL RECOVERY OF METALS FROM WASTE PRINTED CIRCUIT BOARDS .

Authors:  SORIN-AUREL DORNEANU, ENIKO COVACI, FLORICA IMRE-LUCACI, GRAZIELLA LIANA TURDEAN.
 
       
         
  Abstract:  There is increasing interest nowadays in using various electrochemical methods as alternative to the energy consuming physico -mechanical, hydrometallurgical and pyrometallurgical techniques for metals recovery from waste printed circuit boards (WPCBs). Thus, cyclic voltammetry (CV) and cyclic square-wave voltammetry (CSWV) methods were used for studying the electrochemistry of some metals (Cu, Sn, Pb, Fe, Zn) on glassy carbon electrode from synthetic leaching solutions containing known concentrations of metallic ions and in real solution obtained from dissolving 10 WPCBs. A good linear correlation was obtained between the parameters evaluated by ICP-OES and cyclic voltammetry. The influence of pH and oxidation/reduction potential (ORP) on the corrosion rate of the mentioned metals was studied gravimetrically. Based on the obtained results, a complex sensors array (amperometric, pH, temperature and ORP) was proposed to assure the accurate monitoring and control of the electrochemical process for metals recovery from WPCBs.

Keywords: waste printed circuit boards, metals recovery, sensor array, potentiometric and voltammetric sensors
 
         
     
         
         
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