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Recovery of Critical Metals from Rinsing Water by Zero-Valent Iron

Raw materials, which are of great economic importance, but for which the risk of supply bottlenecks is valid, are considered as 'critical�. 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 society�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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