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Browsing TFBor by Subject "acid leaching"

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    Cobalt recovery from spent lithium-ion batteries by leaching in H2SO4-N2 and H2SO4-O2 systems followed by electrochemical deposition
    (Association of Chemical Engineers of Serbia, 2024) Medić, Dragana; Tasić, Žaklina; Nujkić, Maja; Dimitrijević, Silvana; Đorđievski, Stefan; Alagić, Slađana; Milić, Snežana
    This paper is focused on cobalt valorization from the cathode material of spent lithium-ion batteries (LIBs) by using leaching and electrochemical deposition methods. During the leaching experiments, the degrees of cathode material dissolution in H2SO4-N2and H2SO4-O2 systems were compared. Maximal degrees of cobalt extraction were 40 % in the former and 47 % in the latter system under following experimental conditions: H2SO4 concentration of 2mol dm-3, nitrogen/oxygen volumetric flow of 2 L min-1, solid phase concentration of 33gL-1, and temperature of 85 °C. The rate of cobalt extraction from the cathode material in both investigated systems was the most favorable in the first 15 min, after which there was a sudden decrease in the reaction rate. Cobalt from the leaching solution was deposited on a copper substrate by galvanostatic electrochemical deposition with a current efficiency of 84%. The energy consumption was 5.8 kWh kg-1of deposited Co. The cyclic voltammetry (CV) method was used to determine the potential of cobalt deposition, as well as side reactions taking place in the system. Scanning electron microscopy with energy dispersive spectrometry has shown that during the process of electrochemical deposition agglomeration of cobalt particles occurred (in the shape of cauliflower), while the metal was deposited in its elemental state, which was also confirmed by the results of X-ray diffraction analysis.
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    Influence of oxidant concentration on the leaching of flotation tailings in acidic medium
    (Association of Metallurgical Engineers of Serbia (AMES), 2025) Bogdanović, Grozdanka; Marilović, Dragana; Nedelkovski, Vladan; Stevanović, Zoran; Sokić, Miroslav
    The reprocessing of sulphide minerals in flotation tailings is an attractive option for sustainable mine waste management. Conventional mineral processing methods often encounter difficulties when processing tailings, mainly due to factors such as particle size and surface oxidation of minerals. In most cases, copper is extracted from such raw materials using leaching processes. The paper presents an investigation of the leaching of flotation tailings using 0.1 mol/dm3 H2SO4 solution in which ferric ions and hydrogen peroxide play the role of oxidants. The influence of oxidant concentration on the leaching of copper and iron was investigated. It was found that the addition of ferric ions influenced the leaching of copper, with approximately 79% of copper was leached with 5 g/dm3 of Fe(III) ions. It has also been shown that the concentration of hydrogen peroxide affects the leaching of copper and iron. The total copper extraction of 85.31% and iron extraction of 7.66% were achieved with 0.3 mol/dm3 H2O2 during 120 minutes of reaction time.