Regenerative Energie
Raw materials, which are of great economic importance, but for which the risk of supply bottlenecks is valid, are considered as 'criticalâ€. Others, where this risk might occur due to market changes are called 'potentially critical†(FFG 2012). The following metals are defined as (potentially) critical raw materials either by the EU or by the FFG: Be, Mg, Mn, Ni, Co, Zn, Cr, Al, Ga, In, rare earth elements (REE), Ge, Sb, Nb, Ta, W, V, Mo, platinum group elements (PGE).
To counteract supply bottlenecks, critical metal recovery from waste and waste waters plays a crucialrole. While critical methods are already recovered from high-concentrated process waters, only recently low-concentration rinsing waters come into focus due to rising raw material prices. Within the project 'RECOMET - Recovery of Metals†it is be investigated which (potentially) critical raw materials can be fixed from rinsing waters by reduction-induced precipitation and/oradsorption using a fluidized-bed process with iron granules according to e.g.Fe0 + CrO42- + 4 H2O ↔ Fe(OH)3 + Cr(OH)3 + 2 OH- (1)Finally the fixed metals are separated from the solution by filtration. A fluidized-bed technology(ferroDECONT-process), which is approved for the remediation of contaminated sites, i.e. the reduction of chromate and the know-how in the field of waste water cleaning (AVR) are adaptedto the new field of critical metal recovery considering the transition from the 'disposal societyâ€to the 'recycling society†to lay the foundation of future R&D projects for metal recovery from rinsing Waters.
| Copyright: | © Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben |
| Quelle: | Depotech 2014 (November 2014) |
| Seiten: | 1 |
| Preis: | € 0,00 |
| Autor: | Assoz.Prof. Dipl.-Min. Dr.rer.nat. Daniel Vollprecht Peter Müller Robert Mischitz DI (FH) Tobias Olbrich DI Reinhard Olbrich |
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