Study of the enrichment characteristics of sinter by alkali metal vapors Xiaozhe Wang, Zhiwu Yan, Rongrong Wang, Donghui Liu, Jianliang Zhang and Zhengjian Liu Metall. Res. Technol., 115 3 (2018) 310 Published online: 16 July 2018 DOI: 10.1051/metal/2018014