Extraction of niobium in one step from tin slag by NH4F-HCl leaching process - Anes, Iara Alves; Garjulli, Franco; Carvalho, Marcelo Siqueira de; Tenório, Jorge Alberto Soares; Espinosa, Denise Crocce Romano; Coleti, Jorge Luís (The Canadian Journal of Chemical Engineering, 2024)