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公开(公告)号：US20230203688A1
公开(公告)日：2023-06-29
申请号：US18089539
申请日：2022-12-27
发明人： Tianyan XUE , Zhanpeng YAN , Hui ZHANG , Ying YU , Tao QI , Minghui LIU
摘要： A method for extracting palladium includes: (1) mixing a palladium-containing material with nitric acid and an alkali metal ion-containing catalyst to obtain a mixed solution, heating the mixed solution, and removing a resulting residue to obtain a palladium-containing leaching liquor; and (2) subjecting the palladium-containing leaching liquor obtained in step (1) to separative extraction to obtain metallic palladium or at least one palladium-containing product, and reusing a residual solution for step (1) in a subsequent extraction. The alkali metal ion-containing catalyst of the present disclosure can leach palladium at a higher rate than that when pure nitric acid of the same concentration is used and does not volatilize, such that the recycling of a mother liquor can be realized. The method involves simple operations, has low production costs, greatly shortens the palladium extraction time, does not lead to secondary pollution, and meets the requirements of environmental protection.
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公开(公告)号：US20230340681A1
公开(公告)日：2023-10-26
申请号：US18123319
申请日：2023-03-19
发明人： Hui ZHANG , Ying YU , Tianyan XUE , Zhanpeng YAN , Tao QI
CPC分类号： C25C1/20 , C22B11/042 , C22B3/08
摘要： A method for clean recovery of palladium is provided, including the following steps: mixing a palladium-containing material, a Ce4+-containing acidic solution, and an additive, subjecting a resulting mixture to leaching to obtain a Pd2+-containing solution, and subjecting the Pd2+-containing solution to electrolysis to obtain palladium. In the method, the palladium-containing material is subjected to solution leaching with Ce4+ as an oxidative leaching agent and a chlorine-containing additive. After leaching is complete, a Ce4+ and Pd2+-containing leaching liquor is subjected to electrolysis to realize the green regeneration of Ce4+ and palladium. The method of the present disclosure does not lead to the generation of NOx and waste liquid. The present disclosure can significantly reduce the environmental impact and production cost and has excellent economic benefits and application prospects.
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