Advances in Mineral Processing and Hydrometallurgy

Anderson, Corby; Cui, Hao

doi:10.3390/met11091393

Metals

2021

DOI: 10.3390/met11091393

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Advances in Mineral Processing and Hydrometallurgy

Corby Anderson¹,

Hao Cui²

Abstract: A Special Issue of Metals was commissioned that was devoted to aspects of Mineral Processing and Hydrometallurgy [...]

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2022

2024

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Cited by 2 publications

References 31 publications

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Recovery of Platinum Group Metals from Leach Solutions of Spent Catalytic Converters Using Custom-Made Resins

2022

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Platinum group metals (PGMs) play a key role in modern society as they find application in clean technologies and other high-tech equipment. Spent catalytic converters as a secondary resource contain higher PGM concentrations and the recovery of these metals via leaching is continuously being improved but efforts are also directed at the purification of individual metal ions. The study presents the recovery of PGMs, namely, rhodium (Rh), platinum (Pt) and palladium (Pd) as well as base metals, namely, zinc (Zn), nickel (Ni), iron (Fe), manganese (Mn) and chromium (Cr) using leachates from spent diesel and petrol catalytic converters. The largest amount of Pt was leached from the diesel catalytic converter while the petrol gave the highest amount of Pd when leached with aqua regia. Merrifield beads (M) were functionalized with triethylenetetramine (TETA), ethane-1,2-dithiol (SS) and bis((1H-benzimidazol-2-yl)methyl)sulfide (NSN) to form M-TETA, M-SS and M-NSN, respectively, for recovery of PGMs and base metals from the leach solutions. The adsorption and loading capacities of the PGMs and base metals were investigated using column studies at 1 M HCl concentration. The loading capacity was observed in the increasing order of Pd to be 64.93 mmol/g (M-SS), 177.07 mmol/g (M-NSN), and 192.0 mmol/g (M-TETA), respectively, from a petrol catalytic converter. The M-NSN beads also had a much higher loading capacity for Fe (489.55 mmol/g) compared to other base metals. The finding showed that functionalized Merrifield resins were effective for the simultaneous recovery of PGMs and base metals from spent catalytic converters.

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Recovery of Platinum Group Metals from Leach Solutions of Spent Catalytic Converters Using Custom-Made Resins

2022

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Princípios de química verde aplicados na redução hidrometalúrgica de processamento de minérios de Co e Mn auxiliado por ferramentas de aprendizado de máquina

Araújo,

Gois,

Luna

2024

Cad. Pedagógico

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Foi investigado a redução hidrometalúrgica do minério de Mn (máximo de 40% m/m) com soluções de H2O2 e H2SO4, visando o beneficiamento deste minério. Utilizou-se o planejamento experimental Plackett- Burman para a seleção dos fatores: o volume da solução de H2SO4, o volume da solução de H2O2, o tempo de lixiviação (min) e a temperatura de lixiviação (°C), em dois níveis. As variáveis de resposta investigadas foram a recuperação de Manganês (Mn,% m/m) e a recuperação de Cobalto (Co,% m/m). A regressão linear múltipla (MLR) não gerou um bom modelo para prever o teor dos metais . Foi observado que as variáveis de resposta apresentaram distribuições bimodais, o que explica o fato de que os modelos de MLR não se mostrarem adequados. Posteriormente, foi utilizado o planejamento Box-Behnken para os mesmos fatores com três níveis. Foram misturados os ensaios destes planejamentos e aplicaram-se os modelos de regressão multivariada: MLR, máquina de vetor de suporte (SVM), polinomial por spline, florestas aleatórias (RF) e extreme gradiente boosting (XGBoost). O melhor modelo foi aquele obtido por RF para a recuperação do mangânes, enquanto que para a recuperação do cobalto o melhor foi o XGBoost. Os parâmetros de mérito foram R2 ajustado iguais a 0,900 e 0,810, RMSEP de 5,9% e 5,5% e MAE de 5,3% e 4,5% para a Mn, % m/m e Co, % m/m, respectivamente.

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Advances in Mineral Processing and Hydrometallurgy

Abstract: A Special Issue of Metals was commissioned that was devoted to aspects of Mineral Processing and Hydrometallurgy [...]

Cited by 2 publications

References 31 publications

Recovery of Platinum Group Metals from Leach Solutions of Spent Catalytic Converters Using Custom-Made Resins

Recovery of Platinum Group Metals from Leach Solutions of Spent Catalytic Converters Using Custom-Made Resins

Princípios de química verde aplicados na redução hidrometalúrgica de processamento de minérios de Co e Mn auxiliado por ferramentas de aprendizado de máquina

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