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Article

Comprehensive Study on the Mechanism of Sulfating Roasting of Zinc Plant Residue with Iron Sulfates

1
Laboratory of Physical Chemistry and Technology of Iron Ore Processing, A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Science, 49 Leninsky Prosp., 119334 Moscow, Russia
2
Department of Radiochemistry, Faculty of Chemistry, Lomonosov Moscow State University, 1-3 Leninskiye Gory, 119991 Moscow, Russia
3
Department of X-ray Investigation, Merzhanov Institute of Structural Macrokinetics and Materials Science (ISMAN), 8 Academician Osipyan Street, 142432 Chernogolovka, Moscow Region, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Radim Kocich
Materials 2021, 14(17), 5020; https://doi.org/10.3390/ma14175020
Received: 8 July 2021 / Revised: 30 August 2021 / Accepted: 31 August 2021 / Published: 2 September 2021
(This article belongs to the Special Issue Metallurgy of Non-ferrous, Rare and Precious Metals)
Zinc plant residue (ZPR) is a secondary material generated during hydrometallurgical zinc production that contains considerable contents of valuable elements such as Zn, Cu, Fe, Pb, Cd, Ag, In, Ga, Tl. Zinc, copper and accompanying elements in ZPR are in different minerals, mainly in the ferrites. A promising approach for recycling ZPR is the sulfating roasting using iron sulfates followed by water leaching. In this study, the composition of ZPR and the obtained products were thoroughly investigated by various methods including X-ray diffraction analysis (XRD), chemical phase analysis and Mössbauer spectroscopy. The effect of temperature, amount of iron sulfates and roasting time on the conversion of valuable metals into a water-soluble form was thermodynamically and experimentally studied both using pure ferrites and ZPR. Based on the results of time-resolved XRD analysis and synchronous thermal analysis (STA), a mechanism of the sulfation roasting was elucidated. The rate-controlling step of zinc and copper sulfation process during the ZPR roasting was estimated. The sulfating roasting at 600 °C during 180 min with the optimal Fe2(SO4)3∙9H2O addition followed by water leaching enables to recover 99% Zn and 80.3% Cu, while Fe, Pb, Ag, In, Ga retained almost fully in the residue. View Full-Text
Keywords: zinc plant residue; zinc ferrite residue; zinc ferrite; copper ferrite; iron sulfate; sulfating roasting; Mössbauer spectroscopy; time-resolved X-ray diffraction; chemical phase analysis zinc plant residue; zinc ferrite residue; zinc ferrite; copper ferrite; iron sulfate; sulfating roasting; Mössbauer spectroscopy; time-resolved X-ray diffraction; chemical phase analysis
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MDPI and ACS Style

Grudinsky, P.; Pankratov, D.; Kovalev, D.; Grigoreva, D.; Dyubanov, V. Comprehensive Study on the Mechanism of Sulfating Roasting of Zinc Plant Residue with Iron Sulfates. Materials 2021, 14, 5020. https://doi.org/10.3390/ma14175020

AMA Style

Grudinsky P, Pankratov D, Kovalev D, Grigoreva D, Dyubanov V. Comprehensive Study on the Mechanism of Sulfating Roasting of Zinc Plant Residue with Iron Sulfates. Materials. 2021; 14(17):5020. https://doi.org/10.3390/ma14175020

Chicago/Turabian Style

Grudinsky, Pavel, Denis Pankratov, Dmitry Kovalev, Darya Grigoreva, and Valery Dyubanov. 2021. "Comprehensive Study on the Mechanism of Sulfating Roasting of Zinc Plant Residue with Iron Sulfates" Materials 14, no. 17: 5020. https://doi.org/10.3390/ma14175020

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