Experimental Investigation of Pyrometallurgical Treatment of Zinc Residue

Minna Rämä, Ari Jokilaakso, Lassi Klemettinen, Justin Salminen, Pekka Taskinen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

187 Downloads (Pure)


Iron containing leach residues like jarosite and goethite from electrolytic zinc production contain many valuable metals and harmful substances. These metals and substances should be removed in order to obtain an acceptable, stable and reusable product, and maximize economic feasibility as well as minimize environmental footprint. In this work, the processing of jarosite leach residue was studied in laboratory scale experiments under oxidizing and reducing conditions at high temperatures. First, the pretreated material was melted and oxidized to produce a melt of metal oxides. Second, the oxide melt was reduced in CO –CO2 atmosphere. Target after the reduction step was to obtain a clean slag and a liquid metal or speiss phase that collects the valuable metals , such as silver . The kinetics of the thermal processing were studied for determining optimal times and conditions for the aforementioned process steps. The preliminary results show that the process is thermodynamically feasible, and the desired phases can be obtained in the experimental conditions investigated.
Original languageEnglish
Title of host publicationExtraction 2018
Subtitle of host publicationProceedings of the First Global Conference on Extractive Metallurgy
EditorsBoyd Davis, M Moats, S Wang
Place of PublicationWarrendale
Number of pages12
ISBN (Electronic)978-3-319-95022-8
ISBN (Print)978-3-319-95021-1
Publication statusPublished - 2018
MoE publication typeA4 Conference publication
EventGlobal Conference on Extractive Metallurgy - Ottawa, Canada
Duration: 26 Aug 201829 Aug 2018
Conference number: 1

Publication series

NameThe Minerals, Metals & Materials Series


ConferenceGlobal Conference on Extractive Metallurgy
Internet address


  • Jarosite smelting ⋅ Thermal processing ⋅ Circular economy Slag valorization


Dive into the research topics of 'Experimental Investigation of Pyrometallurgical Treatment of Zinc Residue'. Together they form a unique fingerprint.

Cite this