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Thermal Recycling of Waelz Oxide Using Concentrated Solar Energy

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Abstract

The dominating Zn recycling process is the so-called Waelz process. Waelz oxide (WOX), containing 55–65% Zn in oxidic form, is mainly derived from electric arc furnace dust produced during recycling of galvanized steel. After its wash treatment to separate off chlorides, WOX is used as feedstock along with ZnS concentrates for the electrolytic production of high-grade zinc. Novel and environmentally cleaner routes for the purification of WOX and the production of Zn are investigated using concentrated solar energy as the source of high-temperature process heat. The solar-driven clinkering of WOX and its carbothermal reduction were experimentally demonstrated using a 10 kWth packed-bed solar reactor. Solar clinkering at above 1265°C reduced the amount of impurities below 0.1 wt.%. Solar carbothermal reduction using biocharcoal as reducing agent in the 1170–1320°C range yielded 90 wt.% Zn.

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Authors and Affiliations

  1. Solar Technology Laboratory, Paul Scherrer Institute, 5232, Villigen, Switzerland

    N. Tzouganatos, C. Wieckert & A. Steinfeld

  2. Department of Mechanical and Process Engineering, ETH Zurich, 8092, Zurich, Switzerland

    R. Matter & A. Steinfeld

  3. Department of Metallurgy, Montan University, 8700, Leoben, Austria

    J. Antrekowitsch

  4. Befesa Steel Services GmbH, 47269, Duisburg, Germany

    M. Gamroth

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  1. N. Tzouganatos
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  2. R. Matter
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  3. C. Wieckert
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  4. J. Antrekowitsch
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  5. M. Gamroth
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  6. A. Steinfeld
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Correspondence to A. Steinfeld.

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Tzouganatos, N., Matter, R., Wieckert, C. et al. Thermal Recycling of Waelz Oxide Using Concentrated Solar Energy. JOM 65, 1733–1743 (2013). https://doi.org/10.1007/s11837-013-0778-x

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  • DOI: https://doi.org/10.1007/s11837-013-0778-x

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