Physical and Chemical Fundamentals and Technical Solutions for Recovery of Non-ferrous and Rare Metals from Industrial Wastes


The increasing demand for zinc and a range of zinc-related metals (for example: lead; indium; tin; cadmium; and copper) in the Russian Federation cannot be satisfied by the existing production plants due to the lack of raw materials. At the same time, ferrous and non-ferrous metallurgy and the chemical industry have accumulated hundreds of millions of tons of zinc wastes (falling into the hazard categories 2 to 4), the processing of which could not only make up the raw material base, but also improve the environmental situation. In the world, over 85% of ferrous dust is recycled using the Waelz process. The Waeltz process is used for distilling separation of elements under reducing conditions. In this study, a block diagram for production of the following elements from industrial wastes is proposed: zinc, cadmium and indium in form of massive metals; zinc and indium in the form of fine powders; and clinker as a raw material for cement production. The technical and scientific details of this new process have been patented in the Russian Federation and abroad. For the first time, the following operations have been implemented with the use of large-sized Waelz kilns: vapour-oxidized Waeltz treatment of polymetallic wastes; recycling of heat from gases and solid products with generation of process fumes; and implementation of alternative flux (dolomite) and alternative fuel (petroleum coke).

Keywords: Waelz process, industrial wastes, heat recycling, vapour-oxidized Waelz processing

[1] Leontiev, L. I. (2013). No Further Accumulation of Metallurgy Waste. Ecology and Industry of Russia, issue 1, pp. 1-3.

[2] Piret, N. L. and Muller, D. (1993). Beurteilungskriterien der Verarbeitung von Reststoffen mit niedrigem Zinkgehalt aus der Eisen und Stahlproduction. Erzmettal, vol. 46, issue 6, pp. 364-368.

[3] Zunkel, A. D. (1999). EAF DustTreatment Technologies and Processes: A Status Report. In Proc. Rewas’99—Global Symposium on Recycling, Waste Treatment and Clean Technology, vol. II. TMS, San Sebastian, pp.1453–1461.

[4] Rutten, J. T. (2009). Ist der Walzprozess fur EAF Staub noch zeitgemab? Stand der Technic und Herausforderungen, Vemetzung von Zink und Stahl. Presented at 2. GDMB Seminar, Leoben, Heft 118 der Schriftenreihe der GDMB, Leoben, Österreich, S. 137-149.

[5] Nakamura, T. (2005, October). Zink Recycling Technology Now and in the Future. Presented at the International Symposium on Lead & Zinc., Kyoto, Japan. Kyoto: MMIJ. Vol. 1, pp. 123-137.

[6] Yakornov, S. A., et al. (2017). Features of the Decomposition of Zinc Ferrite with Lime in Dust of Electric Arc Melting Steel. Problems of ferrous metallurgy and materials science, issue 3, pp. 29-33.

[7] Kozlov, P. A. (2003). The Waels Process. Moscow: Ore and Metals.

[8] Kozlov, P. A., Panshin, A. M. and Yakornov, S. A. (2017, June). Research, Development and Implementation of Processing Zinc Oxidized Raw Material for Zinc and Indium Recovery at Chelyabinsk Zinc Plant. Presented at European Metallurgical Conference EMC 2017, Leipzig, Germany. Clausthal- Zellerfeld: GDMB Verlag GmbH. Vol. 4, pp. 1669-1679.

[9] Panshin, A. M., et al. (2015). The Main Directions for Improving Zinc Production at Chelyabinsk Zinc Plant PJSC. Non-ferrous metals, issue 5, pp. 19-21.

[10] Yakornov, S. A., et al. (2017). Development of a Granulation Technology for a Mixture Based on Dust from Electric Arc Furnaces for Pyrometallurgical Processing in Rotary Kilns. Metallurgist, issue 7, pp. 25-29.

[11] Urkunderuber die Eintragung des Gebrauchsmusters No 202014008166.2 Einsatsgutzum Walzen vonzinkbleizinnhaltigen Materiallen. Tag der Almeldung 17.09.2014. Tag der Eintragung 03.11.2014.

[12] Kozlov, P. A., et al. (2019). Development of Technology for the Use of Petroleum Coke in the Waelz Process. Non-ferrous metals, issue 4, pp. 28-32.

[13] Degtyarev, A. M., et al. (2015). Mastering Waelz OxideCalcination Technology in a Tubular Rotary Kiln. Non-ferrous metals, issue 5, pp. 31-35.

[14] Panshin, A. M., et al. (2015). Research and Development of Hydrometallurgical Redistribution in the Technology of Processing Waste from the Copper Industry with the Extraction of Tin into Tin Concentrate. Non-ferrous metals, issue 5, pp. 46-50.

[15] Kozlov, P. A., Panshin, A. M. and Yakornov, S. A. (2019, June). Research and Development of Pyrohydrometallurgical Technology of Ferrous Dust Treatment with Zinc Powder Production. Presented at European Metallurgical Conference EMC 2019, Germany. Clausthal Zellerfeld: GDMB Verlag GmbH. Vol. 1, pp. 199-210.