The RecoDust Process—Upscale of a Pilot Plant

Reiter, Wolfgang; Rieger, Johannes; Lasser, Marlene; Raupenstrauch, Harald; Tappeiner, Tamara

doi:10.1002/srin.202000191

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…The process is funded within the Austrian COMET program K1-MET and is currently in the pilot plant stage (300 kg/h throughput) and transfers the iron content into a slag phase to be used as a secondary iron resource for the sintering plant or the BF. The zinc content in this product stays below 0.5 wt.% [19][20][21]. The crude zinc oxide, which is separated with a bag filter (representing the second product), is treated using a leaching step and shows a low halide content (chlorine and fluorine~0.1 wt.% each).…”

Section: Pyrometallurgical Processesmentioning

confidence: 99%

“…With upscaling to 1000 kg/h being the current focus of the development project, a new pneumatic conveying system was installed; it uses natural gas as the conveying medium. The main benefit of RecoDust is that no carbonaceous solid reducing agents are required since the reducing atmosphere is only adjusted via the natural gas/oxygen flame [19][20][21].…”

Section: Pyrometallurgical Processesmentioning

confidence: 99%

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Residue Valorization in the Iron and Steel Industries: Sustainable Solutions for a Cleaner and More Competitive Future Europe

Rieger¹,

Colla

Matino

et al. 2021

Metals

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The steel industry is an important engine for sustainable growth, added value, and high-quality employment within the European Union. It is committed to reducing its CO2 emissions due to production by up to 50% by 2030 compared to 1990′s level by developing and upscaling the technologies required to contribute to European initiatives, such as the Circular Economy Action Plan (CEAP) and the European Green Deal (EGD). The Clean Steel Partnership (CSP, a public–private partnership), which is led by the European Steel Association (EUROFER) and the European Steel Technology Platform (ESTEP), defined technological CO2 mitigation pathways comprising carbon direct avoidance (CDA), smart carbon usage SCU), and a circular economy (CE). CE approaches ensure competitiveness through increased resource efficiency and sustainability and consist of different issues, such as the valorization of steelmaking residues (dusts, slags, sludge) for internal recycling in the steelmaking process, enhanced steel recycling (scrap use), the use of secondary carbon carriers from non-steel sectors as a reducing agent and energy source in the steelmaking process chain, and CE business models (supply chain analyses). The current paper gives an overview of different technological CE approaches as obtained in a dedicated workshop called “Resi4Future—Residue valorization in iron and steel industry: sustainable solutions for a cleaner and more competitive future Europe” that was organized by ESTEP to focus on future challenges toward the final goal of industrial deployment.

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Section: Pyrometallurgical Processesmentioning

confidence: 99%

Section: Pyrometallurgical Processesmentioning

confidence: 99%

Residue Valorization in the Iron and Steel Industries: Sustainable Solutions for a Cleaner and More Competitive Future Europe

Rieger¹,

Colla

Matino

et al. 2021

Metals

Self Cite

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“…In the trials shown here, the zinc content of the RDS equaling to 0.4 wt.% demonstrated the ability that RecoDust can produce an Fe-rich product with enough quality for an internal recycling as secondary iron source. The 0.4 wt.% zinc is much lower than that of the commissioning phase of the pneumatic conveying system (when starting the pneumatic conveying system, zinc content of 3.1 wt.% was obtained in the RDS) [25]. This low zinc content now being obtained in the RDS is due to the stable uniform dust dosing rate managed by the pneumatic conveying system.…”

Section: Discussionmentioning

confidence: 86%

Recovery of Valuable Materials with the RecoDust Process

Reiter¹,

Rieger²,

Raupenstrauch

et al. 2023

Metals

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The RecoDust process is a pyrometallurgical process for treating steel mill dusts that cannot be recycled internally due to their zinc content, providing numerous benefits compared to conventional processes. State-of-the-art processes often face the problem of recycling only zinc, but not iron, which is frequently landfilled and withdrawn from a closed loop. Furthermore, these processes are also often limited to a specific zinc content in the feedstock. Within the described RecoDust smelting campaigns, basic oxygen converter dust with about 15 wt.% zinc was taken as feedstock. After high-temperature treatment of the input material, the RecoDust slag (RDS) has a zinc content of 0.4 wt.% and the crude zinc oxide (CZO) has a ZnO content of up to 80 wt.%. The RDS is suitable for use in the sinter plant as a secondary raw material. To investigate the influence of adding RDS to a common sintering mixture, sintering pot tests followed by RDI (reduction disintegration indices) tests were carried out. The influence of the admixture of RDS on the RDI values is not detectable. The CZO was fed into a soda extraction system for halogen removal. The halogen removal of this two-stage leaching was highly efficient with over 90% for chlorine.

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“…Zinc can be obtained from zinc ferrite by acid leaching under elevated pressure 9 or using pyrometallurgical processes, such as the Waelz kiln process and its modification and the RecoDust process based on the reduction of heavy metal-containing basic oxygen furnace dust by H 2 and CO, as described in 10 and 11 , respectively. Pickles 12 investigated the selective reduction by iron, reporting an optimal temperature and pressure range for zinc and lead recovery.…”

mentioning

confidence: 99%

Electrochemical characterization of leached steel-making sludge

Langová

Kostura

Raška

et al. 2022

Sci Rep

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In this work, the electrochemical properties of the leached sludge, magnetite and zinc ferrite were studied. Acetic acid was used as a leaching reagent because, in recent years, there has been a surge of interest in using zinc-containing materials as photocatalysts, with acetic acid finding application in their preparation. Various methodological approaches were used, but the best results were achieved with a combination of 1–3 h leaching in 0.01 M acetic acid with a solid/liquid ratio of 500. In this arrangement, zincite was almost completely removed from the sludge, while zinc ferrite and magnetite remained in the solid residue. Ex situ analyses of the main leaching products were performed by X-ray diffraction, infrared spectroscopy, and thermogravimetry. The electrochemical behaviour of solid residue and model systems, that are micromagnetite and zinc ferrite, was studied in alkaline media by means of modified carbon paste electrodes, cyclic voltammetry, and chronocoulometry, with a suitable potential window ranging from 0 to 1.5 V. In summary, a linear dependence of the anodic and cathodic peak height on the square root of the scan rate was found. The position of the anodic and cathodic peaks shifted slightly with scan rate, only at low rates, up to 25 mV/s, the individual peaks coincided. The electrochemical response suggested a quasireversible process.

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The RecoDust Process—Upscale of a Pilot Plant

Cited by 4 publications

References 5 publications

Residue Valorization in the Iron and Steel Industries: Sustainable Solutions for a Cleaner and More Competitive Future Europe

Residue Valorization in the Iron and Steel Industries: Sustainable Solutions for a Cleaner and More Competitive Future Europe

Recovery of Valuable Materials with the RecoDust Process

Electrochemical characterization of leached steel-making sludge

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