A Shubo, Sun Shuchen, Tu Ganfeng, Liu Ronghui, Xiao Faxin, Shi Ruifeng, Sui Chengfu, Yu Kuopei
School of Metallurgy, Northeastern University, Shenyang, People's Republic of China.
National Engineering Research Center for Rare Earth, General research Institute for Nonferrous Metals, Beijing, People's Republic of China.
Environ Technol. 2025 Apr;46(10):1666-1678. doi: 10.1080/09593330.2024.2398809. Epub 2024 Sep 27.
Automotive catalysts are the largest consumption source of platinum group metals (PGMs). When it exceeds its useful life, spent automotive catalysts (SACs) are the most important secondary PGMs resource and are classified as hazardous solid waste. Recycling SAC is a promising solution to alleviate the shortage of PGMs resources for projects and reduce environmental pollution. The technology for recovering PGMs by iron-melting collection can obtain Fe-PGMs alloy and harmless glass slag. In this paper, the spontaneous aggregation and growth behaviour of Fe and PGMs in slag at melting temperature were studied, and the settling velocity of Fe-PGMs particles in the slag was calculated to be 6.68 × 10 m/s. The effects of melting time, melting temperature and Fe dosage on PGMs recovery were determined, and the optimal conditions were 10 wt% Fe, 1500°C and 40 min. The toxicity test verifies that the slag obtained is a clean slag harmless to the environment. This work explains the mechanism of Fe collection of PGMs and provides a pathway for efficient and harmless recovery of PGMs from SAC.
汽车催化剂是铂族金属（PGMs）的最大消费来源。当汽车催化剂超过其使用寿命时，废汽车催化剂（SACs）是最重要的二次铂族金属资源，并被归类为危险固体废物。回收SAC是缓解项目中铂族金属资源短缺和减少环境污染的一个有前景的解决方案。通过铁熔析回收铂族金属的技术可以得到铁-铂族金属合金和无害玻璃渣。本文研究了铁和铂族金属在熔化温度下在炉渣中的自发聚集和生长行为，并计算出铁-铂族金属颗粒在炉渣中的沉降速度为6.68×10米/秒。确定了熔化时间、熔化温度和铁用量对铂族金属回收率的影响，最佳条件为10 wt%铁、1500°C和40分钟。毒性测试验证了所得到的炉渣是对环境无害的清洁炉渣。这项工作解释了铁收集铂族金属的机理，并为从SAC中高效无害地回收铂族金属提供了一条途径。
