Iron Chloride Vapor Treatment for Leaching Platinum Group Metals from Spent Catalysts

IF 2.5 3区 材料科学 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Yu-ki Taninouchi, Kohei Sunagawa, Toru H. Okabe, Hiroaki Nakano
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Abstract

An efficient and environmentally friendly recovery of platinum group metals (PGMs) from secondary sources is necessary to ensure a sustainable supply of PGMs. In this study, contact with FeCl2 vapor in the presence of metallic Fe was investigated as a useful pretreatment for leaching PGMs from spent automobile catalysts. Fe-PGM alloys were efficiently formed when Pt, Pd, and Rh wires and Rh2O3 powder were subjected to FeCl2 vapor treatment at 1050 K (777 °C) for approximately 40 min. Further, the leachability of the PGMs in spent automobile catalyst samples increased after a similar vapor treatment was applied. When the pulverized spent catalyst sample without pretreatment was leached with aqua regia at 333 K (60 °C) for 60 min, 88% of Pt, 91% of Pd, and 37% of Rh were extracted. Meanwhile, after vapor treatment at 1050 K, 98% of Pt, 97% of Pd, and 87% of Rh were extracted under the same leaching conditions. Thus, the pretreatment with FeCl2 vapor, followed by leaching, is a feasible and effective technique for recovering PGMs from spent catalysts.

Graphical Abstract

Abstract Image

从废催化剂中沥滤铂族金属的氯化铁蒸汽处理技术
要确保铂族金属的可持续供应,就必须从二次资源中高效、环保地回收铂族金属(PGMs)。在本研究中,研究了在金属 Fe 存在的情况下与 FeCl2 蒸汽接触,作为从废汽车催化剂中沥滤 PGM 的有效预处理方法。铂、钯、铑丝和 Rh2O3 粉末在 1050 K(777 ℃)下经过约 40 分钟的 FeCl2 蒸汽处理后,可有效地形成铁-PGM 合金。此外,经过类似的气相处理后,废汽车催化剂样品中 PGM 的浸出率也有所提高。当在 333 K(60 °C)下用王水对未经预处理的废催化剂样品进行浸出 60 分钟后,88% 的铂、91% 的钯和 37% 的铑被提取出来。同时,在相同的浸出条件下,在 1050 K 下进行蒸气处理后,铂的提取率为 98%,钯的提取率为 97%,铑的提取率为 87%。因此,用 FeCl2 蒸汽进行预处理,然后进行浸出,是一种从废催化剂中回收 PGM 的可行而有效的技术。
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来源期刊
Journal of Sustainable Metallurgy
Journal of Sustainable Metallurgy Materials Science-Metals and Alloys
CiteScore
4.00
自引率
12.50%
发文量
151
期刊介绍: Journal of Sustainable Metallurgy is dedicated to presenting metallurgical processes and related research aimed at improving the sustainability of metal-producing industries, with a particular emphasis on materials recovery, reuse, and recycling. Its editorial scope encompasses new techniques, as well as optimization of existing processes, including utilization, treatment, and management of metallurgically generated residues. Articles on non-technical barriers and drivers that can affect sustainability will also be considered.
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