The wet process is the mainstream recycling process for waste palladium catalysts,as a classic traditional wet process,the roasting-leaching-displacement-purification process has both significant advantages and disadvantages.The experiment uses HCl-NaClO3 system to leach waste palladium catalyst,studies the influencing factors of sulfide precipitation,reveals the precipitation law of PdS,improves process parameters,achieves technical optimization,and provides a reliable theoretical basis for industrial application.Research has shown that the sulfide precipitation method can replace the iron displacement method,which produces a large amount of slag,the palladium precipitation rate can reach 99.99%,and the precious metal content in the tailings meets the relevant emission standards,and the palladium in the leachate can be efficiently enriched.
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