Preparation of Magnesium Silicide from Recycled Materials for Energy Storage.

0468107 - ÚCHP 2017 RIV CZ eng C - Conference Paper (international conference)
Bumba, Jakub - Dytrych, Pavel - Šolcová, Olga - Koštejn, Martin - Fajgar, Radek - Maléterová, Ywetta - Kaštánek, František
Preparation of Magnesium Silicide from Recycled Materials for Energy Storage.
Proceedings of the 4th International Conference on Chemical Technology. Prague: Czech Society of Industrial Chemistry, 2016 - (Veselý, M.; Hrdlička, Z.; Hanika, J.; Lubojacký, J.), s. 407-411. ICCT. ISBN 978-80-86238-94-4. ISSN 2336-811X. E-ISSN 2336-8128.
[International Conference on Chemical Technology /4./. Mikulov (CZ), 25.04.2016-27.04.2016]
R&D Projects: GA ČR GA15-14228S
Institutional support: RVO:67985858
Keywords : magnesium silicide * multi-step technology * recycled materials
OECD category: Chemical process engineering

Recycling technologies help to save energy, materials and environment. This is the main reason of their popularity. The recovery of semiconductors and metals depends on recycling treatment. A new multi-step technology, which enables to obtain pure silicon and hydrogen from waste materials,is reported in this study. The only by-product is magnesium phosphate, which is a desired fertilizer. Magnesium silicide was successfully prepared from milled silicon photovoltaic (PV) panels and milled Mg obtained from the scrap. The formed magnesium silicide was then hydrolysed by phosphoric acid to form a mixture of silanes. Gaseous products (silanes) were separated by cooling below their boiling temperature by liquid nitrogen and then thermally decomposed by a hot wire, e.g. Pt.This treatment leads to pure silicon and hydrogen release. In this study a deep-in characterization by various methods spectroscopy, Scanning Electron Microscopy (SEM) with Energy Dispersive X- Ray spectroscopy (EDX), etc.) of prepared samples was also done to explain the individual influences, e.g. reaction temperature and atmosphere.
Permanent Link: http://hdl.handle.net/11104/0268243