Platinum Recovered from Automotive Heavy-Duty Diesel Engine Exhaust Systems in Hydrometallurgical Operation

Metals

Ekaterini Polyzou¹  Iakovos Yakoumis¹  Sotiria Papagianni¹  Anastasia-Maria Moschovi¹ 

[1] MONOLITHOS Catalysts and Recycling Ltd., Vrilissou 83, 114 76 Athens, Greece;

关键词: platinum group metals;    hydrometallurgy;    c-DPF;    DOC;    leaching;   

DOI  :  10.3390/met12010031

来源: DOAJ

【 摘 要 】

The current study is focused on platinum recovery from the secondary sources of end-of-life heavy-duty diesel oxidation catalysts (DOCs) and heavy-duty catalyzed diesel particulate filters (c-DPFs) in order to reduce the supply–demand gap within the European Union. The extraction of platinum was based on a hydrometallurgical single-step low acidity leaching system (HCl-H₂O₂-NaCl) and a calcination step that takes place before the leaching process. The parameters of calcination and leaching process were thoroughly investigated in order to optimize recovery efficiency. The optimized results proved that a calcination step (at 800 °C for 2 h) improves the recovery efficiency by a factor of 40%. In addition, optimal Pt recovery yield was achieved after 3 h of leaching at 70 °C, with a solid-to-liquid (S/L) ratio of 70 g/100 mL (70%) and 3 M HCl-1% vol H₂O₂-4.5 M NaCl as leaching conditions. The optimum Pt recovery yield was 95% and 75% for DOC and c-DPF, respectively. Since the secondary feedstock investigated is highly concentrated in platinum, the pregnant solution can be used as a precursor for developing new Pt-based catalytic systems.

【 授权许可】

Unknown