ORAL

SESSION: Non-ferrousTueAM-R1	Barrios International Symposium on Sustainable Non-ferrous Smelting and Hydro/Electrochemical Processing (5th Intl. Symp. on Sustainable Non-ferrous Smelting and Hydro/Electrochemical Processing)
Tue Oct, 24 2017	Room: Condesa II
Session Chairs: Yoshiei Kato; Takahiko Okura; Session Monitor: TBA

15:30: [Non-ferrousTueAM07] Plenary
New Ways of Utilizing Secondary Zinc Oxides in Zinc Production
Juergen Antrekowitsch¹ ; ¹Christian Doppler Laboratory for Optimization and Biomass Utilization in Heavy Metal Recycling, Leoben, Austria;
Paper Id: 166 [Abstract]

Huge amounts of low-quality secondary zinc oxides are produced by the recycling of steel mill dust or other zinc-containing residues. Due to different impurities the utilization of secondary zinc concentrates, such as waelz oxide, is currently limited to primary zinc industry, undergoing the whole process chain from roasting to winning electrolysis or alternatively solvent extraction and electrolysis. The paper discusses the background of the necessity of purification steps like roasting or solvent extraction as well as the disadvantages of these procedures. Furthermore, opportunities of how to bypass such steps and by doing this, give more value to the secondary zinc oxides, are described. In this special field, Montanuniversitaet Leoben was able to develop some important procedures whereof one is currently patented. Focus on the investigations was especially on the Zinc-Iron separation and the removal of fluorine-containing compounds. Results of various trials improving the zinc oxide quality are summarized and a discussion of economic aspects is performed within the paper. Also included is an evaluation of the world wide potential and an outlook of possible implementations of developed concepts.

SESSION: RecyclingWedPM-R4	5th Intl. Symp. on Sustainable Materials Recycling Processes and Products
Wed Oct, 25 2017	Room: Peninsula 4
Session Chairs: Juergen Antrekowitsch; Stefan Wegscheider; Session Monitor: TBA

14:30: [RecyclingWedPM05]
Recycling of Jarosite and Electric Arc Furnace Dust in a Metal Bath Process to Recover Valuable Metals
Stefan Wegscheider¹ ; Juergen Antrekowitsch² ; Stefan Steinlechner³ ; ¹Montauniversitaet Leoben, Leoben, Austria; ²Christian Doppler Laboratory for Optimization and Biomass Utilization in Heavy Metal Recycling, Leoben, Austria; ³Chair of Nonferrous Metallurgy, Leoben, Austria;
Paper Id: 57 [Abstract]

The recycling of hazardous metallurgical waste, such as jarosite, a precipitation residue from the hydrometallurgical zinc winning route and electric arc furnace dust (EAFD) from the iron and steel industry displays one aim for the future to open up new chances for secondary resources and to avoid landfilling. More than 50 % of the worldwide production of EAFD and the majority of the jarosite are still dumped, although there are valuable metals, such as zinc, lead, indium, silver and iron present in these by-products. Since the EAFD and the jarosite represent a high economical potential, a metal bath process offers a possibility to reprocess both residues together and to achieve a multi-metal recovery. The advantages of the process are that two residues can be treated together to recover valuable metals, while at the same time no more dumping of the waste is necessary. The products of the process include a metal-bearing off-gas, an iron alloy as well as a slag. This paper describes the concept of the developed metal bath process and shows first results of carried out lab-scale trials.