Concentrating Pt from a spent alumina carrier catalyst by a roast-leach process Haigang Dong, Jiachun Zhao, Weifeng Tong, Hao Cui and Yuedong Wu Metall. Res. Technol., 116 2 (2019) 204 Published online: 25 January 2019 DOI: 10.1051/metal/2018115