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Recovery of critical resources from production waste of the specialised glass industry by gas-phase reaction
Glasses from the optical specialised glass industry often contain considerable amounts of rare earth elements (REE) like Lanthanum and Yttrium. These are usually bound in the shape of a silicate matrix.
Despite a selective mechanical treatment an additional chemical treatment, is necessary to selectively separate such elements from the matrix.
Inducing solid materials to change into the gas-phase offers the possibility to selectively transfer certain valuable metals into a gaseous compound and thus separate them from the matrix. For that matter the recycling material needs to be treated with a suitable reactant that is gaseous in most cases. Such reactions are not only interesting for the extraction of certain metals from mineral resources or concentrates, but can also be useful for the separation of pollutants.The gas required for this process can be recycled making both releasing and precipitation reactions with hazardous chemicals redundant. Beforehand, theoretical calculations help to estimate whether the separation and recovery of the respective elements via solid/gas-processes are possible and economically feasible. Subsequently the process is experimentally tested in the lab, and verified at pilot scale before optimizingit for the industrial scale.In this paper first results regarding the selective extraction of the mentioned rare earth elements from residues of the specialised glass production are presented.
| Copyright: | © Wasteconsult International | |
| Quelle: | Waste to Resources 2017 (Mai 2017) | |
| Seiten: | 13 | |
| Preis inkl. MwSt.: | € 0,00 | |
| Autor: | Dr. Gert Homm  Dr. Katrin Bokelmann Dr. Carsten Gellermann Prof. Dr. Rudolf Stauber Dr. rer. nat. Michael Dohlen | |
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