2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 3: Non-ferrous & Iron_Steel
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 522 pages |
| ISBN: | 978-1-987820-05-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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A sustainable recycling process for simultaneous recovery of Zn, Pb and Ag from a dumped slag
Alois Unger1; Stefan Steinlechner2; Juergen Antrekowitsch3;1UNIVERSITY OF LEOBEN, Leoben, Austria; 2MONTANUNIVERSITAT, Leoben, Australia; 3CHRISTIAN DOPPLER LABORATORY FOR OPTIMIZATION AND BIOMASS UTILIZATION IN HEAVY METAL RECYCLING, Leoben, Austria;
Type of Paper: Regular
Id Paper: 34
Topic: 3
Abstract:
In this thesis, a pyrometallurgical recycling technique to recover valuable metals from a dumped residue, which was generated in the primary lead-, zinc- production is investigated. Within this process, the residue is charged on a lead bath and the containing valuables like zinc, lead and silver, if present, as well as other oxides, are reduced. The products of the process are a lead alloy, dust with a high content of zinc oxide and an inert-slag with a low concentration of disturbing heavy metals. In the lead alloy, the valuable metals like silver and lead are collected and can be recovered during the lead refining steps. Due to the process temperature, the reduced zinc is in gas phase and leaves the process setup trough the off-gas system. The zinc-vapor is post-combusted with air and the generated dust is collected in the bag house filter.
The paper includes the characterization of the zinc-lead blast furnace slag from the metallurgical point of view. Additionally, thermodynamic calculations are mentioned, which cope with the phase equilibrium under reducing conditions and ternary systems with the focus on slag formation and melting conditions during the recycling process. Furthermore, the setup and the results of laboratory scale trials, with the aim to determine best process conditions, are described. According to this, a process evaluation for technical scale trials, in a Top-Blown-Rotary-Converter (TBRC) and in a DC-Submerged-Arc-Furnace (SAF) is studied.