Simulation of an Alternative Direct Leaching Process for High Iron Content Zinc Concentrates

Oliveira, Caio César Spindola de; Pereira, Daniel Dayrell

doi:10.1007/978-3-030-37070-1_35

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“…It is deduced, based on the previous discussion, that sulfation process can be realized using both gaseous and solid sulfating agents. Although gaseous sulfation seems to be more promising due to a possible variation of the roasting temperature in a wider range than with the application of solid sulfating agents, authors [ 41 ] reported that industrial implementation of gaseous sulfation in a conventional fluidized bed reactor is impracticable because of sticking of formed sulfates to the reactor walls causing the maintenance problems. Moreover, gaseous sulfation requires a proper charge preparation and a binder addition for efficient operation in a selected metallurgical unit.…”

Section: Discussionmentioning

confidence: 99%

“…Sulfation method has several advantages compared with other methods. The main advantages are relatively low roasting temperature range, lack of fuel consumption due to exothermic sulfating reactions [ 41 ], the application of water leaching rather than acid leaching after the roasting to extract zinc and other valuable components. Some authors have studied iron sulfates as sulfating agents for roasting of zinc ferrite residues [ 42 , 43 ], copper slag [ 44 , 45 ], copper tailings [ 46 , 47 ] and electric arc furnace dust from steelmaking [ 48 ].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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Section: Discussionmentioning

confidence: 99%