Original scientific paper
https://doi.org/10.5599/jese.1376
Removal of nickel from Ni(II)-NH3-SO2-CO2-H2O system by electrocoagulation, sedimentation and filtration processes
Armando Rojas Vargas
; Universidad de Holguín “Oscar Lucero Moya”, Holguín, Cuba
María Elena Magaña Haynes
; Centro de Investigaciones del Níquel “Alberto Fernández Monte de Oca”, Holguín, Cuba
Crispin Sánchez Guillen
; Centro de Investigaciones del Níquel “Alberto Fernández Monte de Oca”, Holguín, Cuba
Forat Yasir AlJaberi AlJaberi
; Chemical Engineering Department, Chemical Engineering Department, College of Engineering, Al-Muthanna University, Al-Muthanna, Iraq
Abstract
The nickel removal by electrocoagulation of Ni(II)-NH3-CO2-SO2-H2O system was studied in a batch reactor of 50 L useful volume, with stirring and two pairs of aluminum electrodes. The operating parameters were nickel concentration between 255 and 342 mg L-1, current density of 11.0 and 16.6 mA cm-2, pH 8.34±0.06, mean temperature 58.4±3.9 °C and retention time of 50 min. The maximum nickel removal was 99.7 % at 11.0 mA cm-2, specific energy consumption 16.86 kWh kg-1 of Al3+, 2.438 kWh kg-1 of Ni and the adsorption capacity 5819 mg Ni g-1 of Al3+. The precipitate contained a nickel content of 37.2 % and a true density of 2720 kg m-3, hydrotalcite-like structure layered double hydroxides. The unit area of sedimentation was between 0.25 and 1.96 m2 t-1 day, at a density from 971 to 1019 kg m-1 and 53±4 °C. A model for predicting the specific cake resistance was estimated as a function of pressure drop and suspension concentration at 44.45 kPa and 59.52 kg m-3, resulting in the value of 6.47±107 m kg-1. The average cake humidity was 88 % base humid.
Keywords
Electrocoagulation; kinetics; nickel removal; layered double hydroxide
Hrčak ID:
294874
URI
Publication date:
1.3.2023.
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