期刊
JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY
卷 55, 期 4, 页码 37-40出版社
MINERALS METALS MATERIALS SOC
DOI: 10.1007/s11837-003-0086-y
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A leaching process was established based on the ability of platinum-group metals to,form stable chloro-complexes in acidic chloride solutions. Industrial catalyst losses were examined for the recovery of platinum, palladium, and rhodium by leaching with a mixture of sulfuric acid and sodium chloride to avoid using aqua regia or autoclave conditions. Extraction of platinum and rhodium in 60% H2SO4 at 135degreesC steadily increased with increasing NaCl concentrations reaching 95% and 85%, respectively, at 0.1 M NaCl after two hours. By comparison, palladium was dissolved more quickly but also reached 85% under the same conditions. Extraction of each metal increased with temperatures up to 125degreesC but plateaued at higher temperatures. Similar behavior was observed with increasing H2SO4 concentrations up to 60%. More than 99% extraction of each metal was obtained after ten hours using 0.1 M NaCl and 60% H2SO4 at 125degreesC.
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