Nickel removing of the system Ni(II)-NH3-CO2-SO2-H2O by electrocoagulation on an bank scale. Part I

Keywords: kinetic; electrocoagulation; nickel.

Abstract

The nickel removal from the Ni(II)-NH3-CO2-SO2-H2O system was studied by bench-scale electrocoagulation in a stirred cylindrical reactor, with a useful capacity of 25 L and two pairs of Al/Al electrodes. Effluent liquor from the distillation process of the nickel-producer plant in Punta Gorda, Cuba, and synthetic liquor prepared in the laboratory was used. The operating parameters were: pH 8,6, density of current 8,3 mA/cm2, 40 min of electrolysis, 60 ºC and initial concentration of dissolved nickel between 300 and 652 mg/L. An average removal efficiency of 99,67 (+/-0,06) % was obtained for the effluent liquor, resulting a maximum equilibrium concentration of 7 mg/L. The analysis of the reaction kinetics suggests that the removal is determined by the simultaneous contribution of the resistance of the mechanisms: nucleation, external diffusion, the chemical reaction and a possible autocatalytic effect by the Roginskii-Shultz equation.

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Published
2022-01-05
How to Cite
Rojas-Vargas, A., Ricardo-Riverón, A., Magaña-Haynes, M. E., Toro-Alvarez, D. D., & Sánchez-Guillen, C. (2022). Nickel removing of the system Ni(II)-NH3-CO2-SO2-H2O by electrocoagulation on an bank scale. Part I. Chemical Technology, 42(1), 114-130. Retrieved from https://tecnologiaquimica.uo.edu.cu/index.php/tq/article/view/5227
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