Bioleaching of the α-alumina layer of spent three-way catalysts as a pretreatment for the recovery of platinum group metals

Compagnone, Mariacristina; González-Cortés, José Joaquín; Yeste, María del Pilar; Cantero, Domingo; Ramírez, Martín

doi:10.1016/j.jenvman.2023.118825

Cited by 1 publication

(2 citation statements)

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“…In the context of PGM recovery from secondary sources, prior studies have indicated that higher recovery yields are achieved when employing lower percentages of solid pulps [12,14,69]. Therefore, a series of experiments was conducted by lowering the solid pulp concentration from 15 to 5%w/v, utilizing the previously optimized conditions (exp D, Figure 1).…”

Section: Comparative Analysis Of Pgm Recovery Using Lower Pulp Densit...mentioning

confidence: 99%

“…PGM recovery can be achieved through pyrometallurgical and hydrometallurgical methods. Pyrometallurgy involves pre-treatment steps combined with high-temperature processes that emit greenhouse gases and pollutants, making waste management challenging [7,12,13]. On the other hand, hydrometallurgy involves the use of uses corrosive chemicals, posing environmental and health risks, and requires resource-intensive chemical production [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Sustainable Recovery of Platinum Group Metals from Spent Automotive Three-Way Catalysts through a Biogenic Thiosulfate-Copper-Ammonia System

Compagnone,

González-Cortés,

Pilar Yeste

et al. 2023

Molecules

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This study explores an eco-friendly method for recovering platinum group metals from a synthetic automotive three-way catalyst (TWC). Bioleaching of palladium (Pd) using the thiosulfate-copper-ammonia leaching processes, with biogenic thiosulfate sourced from a bioreactor used for biogas biodesulfurization, is proposed as a sustainable alternative to conventional methods. Biogenic thiosulfate production was optimized in a gas-lift bioreactor by studying the pH (8–10) and operation modes (batch and continuous) under anoxic and microaerobic conditions for 35 d. The maximum concentration of 4.9 g S2O32− L−1 of biogenic thiosulfate was reached under optimal conditions (batch mode, pH = 10, and airflow rate 0.033 vvm). To optimize Pd bioleaching from a ground TWC, screening through a Plackett–Burman design determined that oxygen and temperature significantly affected the leaching yield negatively and positively, respectively. Based on these results, an optimization through an experimental design was performed, indicating the optimal conditions to be Na2S2O3 1.2 M, CuSO4 0.03 M, (NH4)2SO4 1.5 M, Na2SO3 0.2 M, pH 8, and 60 °C. A remarkable 96.2 and 93.2% of the total Pd was successfully extracted from the solid at 5% pulp density using both commercially available and biogenic thiosulfate, highlighting the method’s versatility for Pd bioleaching from both thiosulfate sources.

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Section: Comparative Analysis Of Pgm Recovery Using Lower Pulp Densit...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sustainable Recovery of Platinum Group Metals from Spent Automotive Three-Way Catalysts through a Biogenic Thiosulfate-Copper-Ammonia System

Compagnone,

González-Cortés,

Pilar Yeste

et al. 2023

Molecules

Self Cite

View full text Add to dashboard Cite

show abstract

Bioleaching of the α-alumina layer of spent three-way catalysts as a pretreatment for the recovery of platinum group metals

Cited by 1 publication

References 90 publications

Sustainable Recovery of Platinum Group Metals from Spent Automotive Three-Way Catalysts through a Biogenic Thiosulfate-Copper-Ammonia System

Sustainable Recovery of Platinum Group Metals from Spent Automotive Three-Way Catalysts through a Biogenic Thiosulfate-Copper-Ammonia System

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