Selective recovery of platinum and palladium from Asahi's PLS in chloride medium

金、银和铂族金属（PGM），包括铂和钯，被称为“贵金属”，价格非常昂贵，不仅广泛用于传统的珠宝首饰，而且作为各种知名的先进材料（包括电子器件）的有用成分。旭炼油加拿大有限公司是旭控股的子公司，通过浸出来自采矿和回收行业（包括电子废物）的二次材料来生产贵金属（金和银）。浸出后，浸出液（PLS）在氯化物介质中含有金、银、铂、钯和一些贱金属。目前，朝日精炼只通过从这种浸出液中回收金属金和银来生产金属金和银，而在PLS中留下了所有其他昂贵的PGM，因为他们还没有合适的工艺来选择性地在该工艺条件下回收铂和钯。申请人（Alam博士），具有使用湿法冶金技术从氯化物介质中回收包括PGM在内的各种贵金属的丰富经验。在这个拟议的项目中，他将使用具有新型官能团的生物吸附剂，从Asahi的PLS中选择性地回收剩余的贵金属（铂和钯），这些生物吸附剂是从农业、森林和海洋资源的生物质废物中制备的。如果提议的具有成本效益，可持续和环保的工艺取得成功，它将是旭化成目前工艺流程中采用的一项创新技术，将产生额外的利润，并推动旭化成的贵金属回收业务。

Gold, silver and platinum group metals (PGM) including platinum and palladium are named as "Precious Metals", which are very expensive and are widely used not only as traditional jewelries but also as useful components in a variety of well-known advanced materials including electronic devices. Asahi Refining Canada Ltd., a subsidiary of Asahi Holdings, produces precious metals (gold and silver) by leaching secondary materials coming from the mining and recycling industries including electronic wastes (e-wastes). After leaching, the pregnant leach solution (PLS) contains gold, silver, platinum, palladium and some base metals in a chloride medium. Currently, Asahi Refining only produces metallic gold and silver by recovering them from this leach solution leaving behind all other expensive PGM in the PLS, because they do not have a suitable process yet to selectively recover platinum and palladium in that process conditions. The applicant (Dr. Alam), has extensive experiences recovering different kinds of precious metals including PGM from chloride media using hydrometallurgical techniques. In this proposed project, he will selectively recover the remaining precious metals (platinum and palladium) from the Asahi's PLS using bioadsorbents with novel functional groups prepared from biomass wastes derived from agriculture, forest and marine resources. If the proposed cost-effective, sustainable and environmentally friendly process is successful, it would be an innovative technique to adopt in Asahi's current process flowsheet that will generate extra profit and boost the precious metals recycling business of Asahi Refining.