Alkaline Leaching and Concurrent Cementation of Dissolved Pb and Zn from Zinc Plant Leach Residues

Silwamba, Marthias; Ito, Mayumi; Hiroyoshi, Naoki; Tabelin, Carlito Baltazar; Hashizume, Ryota; Fukushima, Tetsuya; Park, Ilhwan; Jeon, Sanghee; Igarashi, Toshifumi; Satō, Tsutomu; Nyambe, Imasiku; Nakata, Hokuto; Nakayama, Shouta M.M.; Ishizuka, Mayumi

doi:10.3390/min12040393

Cited by 11 publications

(3 citation statements)

References 41 publications

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“…Alkaline leaching of metals from concentrate, ores, or waste (mine waste and ewaste) achieves the selective solubilization of amphoteric elements-Al, Pb, Au, and Zn, among others-leaving the iron (Fe), calcium (Ca), and magnesium (Mg) host minerals that may constitute a large percentage of the processed materials. The challenge, however, is that solid-liquid separation by filtration, especially for strong alkaline, is difficult [15]. Silwamba et al [15] investigated the concurrent recovery of dissolved Pb and Zn by cementation on aluminium metal powder from alkaline pulp (i.e., when zinc leach plant residues were leached using NaOH solution) before filtration.…”

Section: Extraction Of Critical Metals By Hydrometallurgy 221 Alkalin...mentioning

confidence: 99%

“…The challenge, however, is that solid-liquid separation by filtration, especially for strong alkaline, is difficult [15]. Silwamba et al [15] investigated the concurrent recovery of dissolved Pb and Zn by cementation on aluminium metal powder from alkaline pulp (i.e., when zinc leach plant residues were leached using NaOH solution) before filtration. The results showed that around 100% of the dissolved Pb was cemented in the leaching pulp when Al metal powder was added.…”

Section: Extraction Of Critical Metals By Hydrometallurgy 221 Alkalin...mentioning

confidence: 99%

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Editorial for Special Issue “Sustainable Production of Metals for Low-Carbon Technologies”

Park

Silwamba

2023

Minerals

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Section: Extraction Of Critical Metals By Hydrometallurgy 221 Alkalin...mentioning

confidence: 99%

Section: Extraction Of Critical Metals By Hydrometallurgy 221 Alkalin...mentioning

confidence: 99%

Editorial for Special Issue “Sustainable Production of Metals for Low-Carbon Technologies”

Park

Silwamba

2023

Minerals

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“…This is possible since Pb and Zn can both form complexes with hydroxyl ions (OH − ) [ 55 ]. Alkaline leaching presents the advantage of lower dissolution of iron and contamination of the leaching solution [ 56 ]. It also avoids the risk of formation of gel due to the collapse of silicate structures in acidic medium [ 57 ].…”

Section: Recommended Processing Routes For the Recovery Of Valuable M...mentioning

confidence: 99%

Mineralogical Characterization of Historic Copper Slag to Guide the Recovery of Valuable Metals: A Namibian Case Study

Dzinomwa,

Mapani,

Nghipulile

et al. 2023

Materials

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The depletion of the ore reserves in the world necessitates the search for secondary sources such as waste products (tailings and slag). The treatment and cleaning up of such secondary sources also has a positive impact on the environment. A smelter in Namibia we examined had historic slag which accumulated over decades of its operating life, thus posing the challenge of how best to collect representative samples to evaluate and propose viable methods of recovering contained metals. In this study, analytical and mineralogical characterization of the slag was performed using X-ray fluorescence (XRF) analysis, atomic absorption spectrometer (AAS), ICP-OES, scanning electron microscopy energy dispersive spectroscopy (SEM-EDS) analysis, and optical microscopy analysis. The chemical analyses showed that the metal values contained in the slag were mainly copper, lead, and zinc whose average contents were approximately 0.35% Cu, 3% Pb, and 5.5% Zn. About 10.5% Fe was also contained in the slag. Germanium was detected by scanning electron microscopy, but was however below detection limits of the chemical analysis equipment used. Based on the results, approximate conditions under which the different slag phases were formed were estimated and the recovery routes for the various metals were proposed. Analysis by both optical and scanning electron microscopy revealed that Zn and Fe occurred mainly in association with O as oxides, while Cu and Pb were mainly associated with S as sulphides. The slag consisted of three different phases, namely the silicate phase (slag), metallic phase and the sulphide phases. The phases in the slag were mainly silicate phases as well as metallic and sulphide phases. It was observed that the metallic and sulphide phases were dominant in the finer size fractions (−75 µm) whereas the sulphide phase was also present in the coarser size fractions (+300 µm). An important finding from the microscopy examination was that the sulphide phases were interstitial and could be liberated from the slag. This finding meant that liberation and subsequent concentration of the sulphide phases was feasible using conventional processing techniques.

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Greener and Sustainable Production: Production of Industrial Zinc (II) Acetate Solution and Recovery of Some Metals (Zn, Pb, Ag) from Zinc Plant Residue by Ultrasound-Assisted Leaching

Sarı

2024

J. Sustain. Metall.

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Zinc plant residue (ZPR) contains significant amounts of valuable metal (Zn, Pb, Ag, etc.) compounds, as well as various heavy metals and harmful compounds that pollute the environment. Processing such residues allows for the recovery and reuse of valuable metals, which is crucial for sustainable resource management. This study investigated a two-stage leaching process of Zn, Pb, and Ag recovery from ZPR. The first stage of ultrasonic-assisted leaching of ZPR was applied to produce an industrial selective zinc acetate solution. Leaching experiments were carried out with an ultrasonic device in the presence of acetic acid, known as organic acid. Under optimum leaching conditions, the extraction of Zn and Fe metals was obtained as 76.13% and 1.32% Fe, respectively. According to the Brunauer–Emmett–Teller (BET) analysis results on the original sample and ultrasonic leaching residue (ULR), the BET surface area and micropore area increased. However, the mean adsorption pore width decreased. In the second stage, conventional sodium chloride leaching was applied to recover lead and silver from the remaining solid after the first stage. Under the optimum conditions in this stage, 80.12% of Pb and 96.2% of Ag were extracted. The presence of coordination between Zn2+/AcO− (acetate) and Pb2+/Cl− complexes in the leaching solution was revealed by Raman spectroscopy. Finally, according to the characterization analysis of the final leaching residue, it was determined that iron oxides and silicate species accumulated in the solid. In conclusion, a significant reduction in the rate of pollution and toxic metals in ZPR was noticed. Graphical Abstract

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Alkaline Leaching and Concurrent Cementation of Dissolved Pb and Zn from Zinc Plant Leach Residues

Cited by 11 publications

References 41 publications

Editorial for Special Issue “Sustainable Production of Metals for Low-Carbon Technologies”

Editorial for Special Issue “Sustainable Production of Metals for Low-Carbon Technologies”

Mineralogical Characterization of Historic Copper Slag to Guide the Recovery of Valuable Metals: A Namibian Case Study

Greener and Sustainable Production: Production of Industrial Zinc (II) Acetate Solution and Recovery of Some Metals (Zn, Pb, Ag) from Zinc Plant Residue by Ultrasound-Assisted Leaching

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