Keywords: hydrometallurgy; jarosite treatment; roasting; water dissolution (water leaching); precipitation; indium recovery. eng http://creativecommons.org/licenses/by/4.0/legalcode application/pdf 6115369 bytes https://unilib.phaidrabg.rs/o:5245 doi:10.3390/min13040540 cobiss:134704649 ISSN: 2075-163X info:eu-repo/semantics/article Minerals vol. 13 br. 4 str. 1-16 2023 Indium recovery from jarosite Pb-Ag tailings waste (Part 1) Janošević, Miloš Conić, Vesna Božić, Dragana Avramović, Ljiljana Jovanović, Ivana Kamberović, Željko Marjanović, Saša Abstract: The processing of zinc ore using hydrometallurgical methods leads to the formation and accumulation of a by-product called jarosite, which contains concentrated precious metals. In this study, we propose the recovery of In and its separation from Cu, Zn, Fe, Pb, and Ag. This study also presents a proposal for a new technological procedure for jarosite treatment. First we roasted the jarosite, and then the calcine collected was leached in water. The leaching extraction values obtained for Cu, Zn, Fe, and In were 91.07%, 91.97%, 9.60%, and 100.0%, respectively. Following the leaching of the roasted material in water, Pb, Ag, and most of the Fe obtained remained in the solid residue. The leaching solution was treated further by a precipitation process using NaOH, where In and Fe were precipitated and consequently separated from Cu and Zn. The In (OH)3 and Fe(OH)3 precipitates were dissolved further in a diluted H2SO4 solution, and then the cementation of In with Al was performed. We used HCl acid to remove Al from the In, after which unwrought In was obtained.