Separation of PGMs Bearing Alumina Phase from Cordierite in Spent Automobile Catalyst by Thermal Shock

Liu, Gangfeng; Tokumaru, Ayumu; Owada, Shigeki

doi:10.4144/rpsj.60.28

Cited by 15 publications

(3 citation statements)

References 12 publications

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“…43) Furthermore, based on mathematical calculation and modeling, Owada's group reported that heating-quenching of spent catalysts will be a useful pretreatment step for the physical concentration of PGMs. 42,44) When spent catalysts are heated to 600800 °C and subsequently quenched in water, the interface between the catalyst layer and substrate cracks due to differences in their thermal expansion rates. After thermal shock and appropriate pulverization, PGMs are expected to be more efficiently concentrated by particle size sorting.…”

Section: Physical Concentration Of Pgms In Spent Catalystsmentioning

confidence: 99%

Trends of Technological Development of Platinum Group Metal Recycling: Solubilization and Physical Concentration Processes

Taninouchi

Okabe

2023

Mater. Trans.

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Spent automobile catalysts are the most important secondary resource for platinum group metals (PGMs), and their recycling is essential not only to ensure a steady supply of PGMs but also to preserve the natural environment. However, several factors limit the efficiency of PGM recovery in current recycling processes. Specifically, PGMs represent a small proportion of the entire catalyst and are difficult to dissolve in aqueous solutions for subsequent separation. In recent decades, multiple technologies have been developed to make the recycling of PGMs more efficient and environmentally-friendly. Herein, we introduce the typical industrial processes for recovering PGMs from spent catalysts, along with established and emerging trends in the technological development of PGM recycling. Furthermore, we review novel recycling techniques for converting PGMs in spent catalysts into more soluble states and/or physically concentrating PGMs from spent catalysts.

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Section: Physical Concentration Of Pgms In Spent Catalystsmentioning

confidence: 99%

Trends of Technological Development of Platinum Group Metal Recycling: Solubilization and Physical Concentration Processes

Taninouchi

Okabe

2023

Mater. Trans.

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“…Thus, some studies have been conducted on the enrichment process based on physical separation techniques. For example, magnetic separation after pulverization, 10,11) otation after pulverization, 11,12) selective grinding followed by size separation, 13,14) and selective grinding after a heating/quenching treatment 15) have been investigated for physically concentrating PGMs from spent automobile catalysts. Furthermore, physical concentration techniques involving chemical pretreatments, such as alloying, sulfurization, and electroless plating, have also been explored.…”

Section: Introductionmentioning

confidence: 99%

Effective Alloying Treatment for Platinum Using Iron Chloride Vapor

Taninouchi

Okabe

2018

Mater. Trans.

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An effective alloying treatment for Pt using FeCl x (x = 2, 3) vapor was demonstrated towards developing a novel recovery process for platinum group metals (PGMs) in catalyst scrap. Suitable reaction conditions were discussed from the perspective of thermodynamics, and its validity was con rmed experimentally. When pure Pt samples were reacted with FeCl 2 vapor at 1200 K under the coexistence of metallic Fe, an Fe-Pt alloy showing ferromagnetism was easily formed, even though the samples were not in physical contact with the metallic Fe. On the basis of thermodynamic considerations, alloying of Pt mainly proceeds via the disproportionation of FeCl 2 vapor, with the gaseous phase containing FeCl x acting as the medium to transport Fe from the metallic Fe to the Pt samples. When the alloyed sample was kept under FeCl 3 vapor at 1200 K, Fe was removed and ferromagnetism was lost. Therefore, it is concluded that FeCl 2 vapor treatment under the coexistence of Fe is a feasible and useful technique for alloying Pt and forming a ferromagnetic Fe-Pt alloy. The results obtained in this study indicate that treatment with FeCl 2 vapor followed by magnetic separation has potential as an effective technique for concentrating PGMs directly from catalyst scrap.

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“…The use of a heating/quenching process as a pretreatment to the selective-grinding process has also been explored. 21,22) Furthermore, techniques for the physical concentration of PGMs involving chemical pretreatments, such as alloying, sulfurization, and plating, have been proposed and studied recently. [23][24][25][26] The aim of this study was to experimentally demonstrate the feasibility of the novel process shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Platinum Group Metals from Spent Catalysts Using Electroless Nickel Plating and Magnetic Separation

2017

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This study demonstrates a new process for physically recovering platinum group metals (PGMs) directly from spent automobile catalysts. Automobile catalysts mostly consist of a honeycomb-structured ceramic substrate coated with a porous catalyst layer supporting ne particles of Pt, Pd, and Rh. In the proposed process, in order to magnetically separate and concentrate the PGMs, ferromagnetic Ni is deposited on the PGM particles (or the catalyst layer) using an electroless plating technique. Experiments were performed using samples that simulated an automobile catalyst. Using the electroless plating process, Ni could be coated on the porous catalyst layer without requiring complicated pretreatments such as sensitization and activation. Furthermore, the PGMs (Pt, Pd, and Rh) could be extracted and concentrated in the form of a magnetic powder through magnetic separation performed after Ni deposition and subsequent pulverization. Thus, the proposed physical concentration process is feasible and effective, and this process can be extended for making the recycling of automobile catalysts more ef cient and environmentally friendly.

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Separation of PGMs Bearing Alumina Phase from Cordierite in Spent Automobile Catalyst by Thermal Shock

Cited by 15 publications

References 12 publications

Trends of Technological Development of Platinum Group Metal Recycling: Solubilization and Physical Concentration Processes

Trends of Technological Development of Platinum Group Metal Recycling: Solubilization and Physical Concentration Processes

Effective Alloying Treatment for Platinum Using Iron Chloride Vapor

Recovery of Platinum Group Metals from Spent Catalysts Using Electroless Nickel Plating and Magnetic Separation

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