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Open AccessArticle

Modifications and Improvements to the Collector Metal Method Using an mhd Pump for Recovering Platinum from Used Car Catalysts

1
Faculty of Materials Engineering and Metallurgy, Silesian University of Technology, 44-100 Gliwice, Poland
2
Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 30-059 Cracow, Poland
*
Author to whom correspondence should be addressed.
Catalysts 2020, 10(8), 880; https://doi.org/10.3390/catal10080880
Received: 11 July 2020 / Revised: 28 July 2020 / Accepted: 29 July 2020 / Published: 4 August 2020
(This article belongs to the Special Issue Recent Advances Utilized in the Recycling of Catalysts)
Today recovery of platinum from used auto catalysts has become a necessity due to great demand for this catalytic metal. There are many methods of recovering platinum from used catalysts on the market, one of them is the original collector metal method using the magneto-hydrodynamic (mhd) pump. This method is based on the continuous flow of the collector metal (lead) in the channel of the device, which can be obtained by using the mhd pump at the device operating temperature of 673 K. Proper selection of process parameters such as power frequency (25–100 Hz), inductor current density (20 A, 40 A, 60 A), gaps between the inductor and the liquid metal channel (2,4,8), flow velocity, secondary voltage (19 V, 40 V, 60 V) ensures proper efficiency of the device. Some parameters were selected on the basis of numerical simulations, others were experimentally verified—the tests were carried out for different washing out times (600 s to 3600 s), and different secondary voltage and inductor supply frequency (25 Hz to 45 Hz). Platinum washing out efficiency of up to 98% was obtained with a relatively short washing out time and low values of secondary voltage and inductor frequency. To improve the efficiency of the process, the thermal efficiency of the device was increased by 8% by insulating the cover of the device. Further modifications to the process include changing the collector metal—preliminary studies show that the addition of lithium increases the extraction of platinum from thin catalytic layers as a result of reduced surface tension of the extraction liquid. The preliminary results of the PbLi alloy spread on platinum coated surface seem to be very promising. View Full-Text
Keywords: car catalyst; platinum recovery; collector metal method; mhd pump car catalyst; platinum recovery; collector metal method; mhd pump
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Saternus, M.; Fornalczyk, A.; Gąsior, W.; Dębski, A.; Terlicka, S. Modifications and Improvements to the Collector Metal Method Using an mhd Pump for Recovering Platinum from Used Car Catalysts. Catalysts 2020, 10, 880.

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