Leaching Platinum Group Metals from Simulated Spent Auto-Catalyst Material Using Ozone and Hydrochloric Acid

被引:0
作者
Knight, Marcus [1 ]
van Wyk, Petrie [1 ]
Akdogan, Guven [1 ]
Bradshaw, Steven [1 ]
机构
[1] Stellenbosch Univ, Dept Chem Engn, ZA-7602 Stellenbosch, South Africa
关键词
leaching; auto-catalysts; platinum group metals; ELECTRONIC WASTE; RECOVERY; PALLADIUM; GOLD;
D O I
10.3390/min14100998
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
This paper reports the development of a process for leaching Pt, Pd, and Rh from simulated spent auto-catalyst material using ozone and hydrochloric acid in order to produce a pregnant leach solution that could be fed to an industrial precious metal refinery. The effects of O3 mass flow, initial acid concentration, and temperature were investigated using a Box-Behnken experimental design with three centre-point runs and a total leach time of 6 h. Set points of 3.34, 5.01, and 6.68 g/h; 1.0 M, 3.0 M, and 5.0 M; and 30, 60, and 90 degrees C were used for O3 mass flow, hydrochloric acid concentration, and temperature, respectively. The optimal extractions for Pt, Pd, and Rh were 80%, 85%, and 42%, respectively, at 5.01 g/h O3, 5.0 M HCl, and 90 degrees C. Statistical analyses indicated high dependencies of Pd and Rh on hydrochloric acid concentration and temperature, with only Pt displaying a significant dependence on O3 mass flow.
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页数:11
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