Innovative Concept for the Recovery of Silver and Indium by a Combined Treatment of Jarosite and Electric Arc Furnace Dust

Wegscheider, Stefan; Steinlechner, Stefan; Leuchtenmüller, Manuel

doi:10.1007/s11837-016-2192-7

Cited by 20 publications

(9 citation statements)

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“…Thus, they can be regarded as the limiting minimum values in the industrial operations as well, see, e.g., Hughes [34]. Additionally the selected slag-to-metal ratio determines the maximum recoveries in the collector metal, in the absence of volatilization [35]. The trace element solubilities in the slags from Cu + 1 wt% Me copper alloy obtained in this study indicate a general decreasing trend when silica concentration is increased.…”

Section: Solubilities Of the Trace Elements In The Slagmentioning

confidence: 62%

Slag Cleaning Equilibria in Iron Silicate Slag–Copper Systems

Hellstén

Klemettinen

Sukhomlinov

et al. 2019

J. Sustain. Metall.

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In this study, the equilibrium distributions of selected trace elements between molten iron-saturated copper alloy and selected iron silicate slags were measured, and the effects of silica fluxing on them. In addition to the copper and iron main components of the system, trace elements like antimony, gallium, germanium, gold, indium, and silver were added in experiments that spanned the temperature range of 1473-1573 K (1200-1300 °C). Experimental charges were quenched and prepared in polished mounts. In situ analyses of the resulting phases were made directly on the mounts without the need of phase separation prior to analysis. Electron probe X-ray microanalysis was used for concentrations at or above approximately 100 ppmw, and laser ablation-inductively coupled plasma-mass spectrometry for the lower concentrations in the slags. The very low slag concentrations of germanium, antimony, and indium obtained indicate that these elements can be removed from the slag by reduction, whereas gallium concentrations in the slag were high. Consequently, gallium removal from iron residues, such as zinc smelting jarosite, is difficult without volatilization. Based on the present observations, the industrial reduction processes for the treatment of smelting and refining slags as well as for the processing of iron residues, and extracting the reducible metal oxides and their metal values can be optimized. The target in fluxing should be to maintain the slag compositions with a silica concentration higher than about 28 wt%.

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Section: Solubilities Of the Trace Elements In The Slagmentioning

confidence: 62%

Slag Cleaning Equilibria in Iron Silicate Slag–Copper Systems

Hellstén

Klemettinen

Sukhomlinov

et al. 2019

J. Sustain. Metall.

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“…However, the overall goal to improve yields and resource efficiency, legislative matters, as well as the aim towards a circular economy have increased the interest in processing these residues into a usable form. The goal is to produce an inert slag that could be used for construction purposes and, simultaneously, to recover the valuable metals from the residue [9,10]. Some production sites have already started to treat the generated residues with different pyrometallurgical technologies [2,11,12].…”

Section: Introductionmentioning

confidence: 99%

“…First of all, large amounts of already stockpiled or continuously produced iron-rich residues could be utilized, for example in road building or other construction material applications, instead of being disposed of [11,13]. The availability of land for this kind of hazardous waste landfilling is also limited, and causes additional costs [10,13,14]. In addition, recycling of the valuable metals within the residues is hindered due to the present practice, which results in these metals ending up in the landfills.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Processing of Jarosite Leach Residue for a Safe Disposable Slag and Valuable Metals Recovery

Rämä

Nurmi

Jokilaakso

et al. 2018

Metals

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In electrolytic production of zinc, the iron levels in the solutions are controlled by precipitation of jarosite or goethite. These precipitates also co-precipitate unrecovered valuable metals (Zn, Pb, Cu, Ag) as well as elements of concern (As, Cd, Hg). After stabilization, the residues are traditionally landfilled. This work investigates pyrometallurgical treatment of jarosite residue to convert the material into reusable clean slag and to recover the valuable metals within the residue. The pyrometallurgical treatment is divided into two functional steps. First, the material is melted in an oxidizing atmosphere, after which the oxide melt is reduced to produce an inert, clean slag. Then, a liquid metal or speiss phase collects the valuable metals, such as silver. The aim was to examine the optimal process conditions for reaching the target values for remaining metals in the slag; Pb < 0.03 wt %, Zn < 1 wt %. As a conclusion, the limiting factor in sulfur, lead, and zinc removal is the contact between the oxidizing or reducing gas and the molten sample. The mass transfer and volatile metals removal were significantly improved with a gas lance installation. The improved gas-liquid interaction enabled the first steps of gas flow rate optimization and ensured the sufficiently low end-concentrations of the aforementioned elements.

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“…The formula of the equilibrium constant, K, for the general vaporization reaction above can be transformed according to the vapor pressure, p. Based on the assumption of pure substances, the activity can be set to 1, resulting in the simplified Equation (12) for the vapor pressure of a compound at the temperature assumed for the calculation of the equilibrium constant:…”

Section: Thermodynamic Considerations Of the Behavior Of Indium And Smentioning

confidence: 99%

Thermodynamic Considerations for a Pyrometallurgical Extraction of Indium and Silver from a Jarosite Residue

Steinlechner

Antrekowitsch

2018

Metals

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Indium and silver are technologically important, critical metals, and in the majority of cases, they are extracted as a by-product of another carrier metal. The importance of indium has seen recent growth, and for technological reasons, these metals can be found in industrial residues from primary zinc production, such as the iron precipitate-jarosite. To secure the supply of such metals in Europe, and with the idea of a circular economy and the sustainable use of raw materials, the recycling of such industrial residues is coming into focus. Due to the low value of jarosite, the focus must lie simultaneously on the recovery of valuable metals and the production of high-quality products in order to pursue an economical process. The objective of this article is to give the fundamentals for the development of a successful process to extract the minor elements from roasted jarosite. As such, we use thermodynamic calculations to show the behavior of indium and silver, leading to a recommendation for the required conditions for a successful extraction process. In summary, the formation of chlorine compounds shows high potential to meet the challenge of simultaneously recovering these metals together with zinc at the lowest possible energy input.

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Innovative Concept for the Recovery of Silver and Indium by a Combined Treatment of Jarosite and Electric Arc Furnace Dust

Cited by 20 publications

References 0 publications

Slag Cleaning Equilibria in Iron Silicate Slag–Copper Systems

Slag Cleaning Equilibria in Iron Silicate Slag–Copper Systems

Thermal Processing of Jarosite Leach Residue for a Safe Disposable Slag and Valuable Metals Recovery

Thermodynamic Considerations for a Pyrometallurgical Extraction of Indium and Silver from a Jarosite Residue

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