Abstract

ROJAS-VARGAS, Armando; MAGANA-HAYNES, María Elena; TORO-ALVAREZ, Dania Del  and  SANCHEZ-GUILLEN, Crispín. Nickel removing of the system Ni(II)-NH₃-CO₂-SO₂-H₂O by electrocoagulation on an bank scale. Part II. RTQ [online]. 2023, vol.43, n.1, pp. 121-137.  Epub Jan 25, 2023. ISSN 2224-6185.

The nickel removal of the system Ni(II)-NH3-CO2-SO2-H2O was studied by electrocoagulation in a cylindrical reactor with agitation, of 25 L of useful capacity and two pair of Al/Al electrodes. Effluentliquor from the distillation process of the nickel-producer plant in Punta Gorda, Cuba, was processed with nickel concentration from 300 to 652 mg/L, at a current density of 8,3 mA/cm2, 60 ºC and pH 8,64 (+/-0,033). An average removal efficiency of 99,65 (+/-0,07) % was obtained, an equilibrium concentration less than 2 mg/L and an adsorption capacity between 3342 and 7264 mg/g. According to the kinetic and equilibrium analysis, it is considered that the process is probably under the control of the resistance of the chemical reaction mechanisms and its autocatalytic contribution. The operation costs for electrical energyand electrode consumption were between 11,122 y 16,022 CUP/kg of removed nickel and the specific energy consumption of 1,709 to 2,342 kW-h/kg of Al.

Keywords : adsorption; kinetic; electrocoagulation; nickel.

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