Selective Recovery of Cadmium, Cobalt, and Nickel from Spent Ni–Cd Batteries Using Adogen® 464 and Mesoporous Silica Derivatives

Spent Ni–Cd batteries are now considered an important source for many valuable metals. The recovery of cadmium, cobalt, and nickel from spent Ni–Cd Batteries has been performed in this study. The optimum leaching process was achieved using 20% H2SO4, solid/liquid (S/L) 1/5 at 80 °C for 6 h. The leac...

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Published inInternational journal of molecular sciences Vol. 23; no. 15; p. 8677
Main Authors Weshahy, Ahmed R., Sakr, Ahmed K., Gouda, Ayman A., Atia, Bahig M., Somaily, H. H., Hanfi, Mohamed Y., Sayyed, M. I., El Sheikh, Ragaa, El-Sheikh, Enass M., Radwan, Hend A., Cheira, Mohamed F., Gado, Mohamed A.
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.08.2022
MDPI
Subjects
Adsorption
Ambient temperature
Ammonium hydroxide
Aqueous solutions
Batteries
Cadmium
Cobalt
Efficiency
Hydrochloric acid
Investigations
Kerosene
Leaching
Liquor
Materials recovery
Metals
nickel
Recycling
Room temperature
separation
Separation techniques
Sodium hydroxide
Sodium sulfide
Solvent extraction processes
spent Ni–Cd batteries
Sulfuric acid
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Summary:Spent Ni–Cd batteries are now considered an important source for many valuable metals. The recovery of cadmium, cobalt, and nickel from spent Ni–Cd Batteries has been performed in this study. The optimum leaching process was achieved using 20% H2SO4, solid/liquid (S/L) 1/5 at 80 °C for 6 h. The leaching efficiency of Fe, Cd, and Co was nearly 100%, whereas the leaching efficiency of Ni was 95%. The recovery of the concerned elements was attained using successive different separation techniques. Cd(II) ions were extracted by a solvent, namely, Adogen® 464, and precipitated as CdS with 0.5% Na2S solution at pH of 1.25 and room temperature. The extraction process corresponded to pseudo-2nd-order. The prepared PTU-MS silica was applied for adsorption of Co(II) ions from aqueous solution, while the desorption process was performed using 0.3 M H2SO4. Cobalt was precipitated at pH 9.0 as Co(OH)2 using NH4OH. The kinetic and thermodynamic parameters were also investigated. Nickel was directly precipitated at pH 8.25 using a 10% NaOH solution at ambient temperature. FTIR, SEM, and EDX confirm the structure of the products.
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ISSN:1422-0067
1661-6596
1422-0067
DOI:10.3390/ijms23158677