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Montoya Herrera, J.
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article
Recycling of aggregates of Panasqueira mines as refractory lining of metal casting [Reciclagem de agregados das minas da Panasqueira como revestimento refratário da fundição de metais]
Abstract
Over the years, in the Panasqueira mines (Covilhã, Portugal) were accumulated mountains of stones (wastes) has a result of the tungsten extraction without any application. This research aims to assist in the implementation of these wastes, using it as refractory lining in foundry (green moulding process), particular in foundry of non-ferrous metals. Experimental methodology consisted in mineralogical characterization (XRF and XRD), as well as the evaluation of the permeability to water vapour, fundamental aspect to be considered in the materials which constitute the moulds with refractory properties for metal casting. Two compositions have been considered and subsequently assessed by scanning electron microscopy (SEM), his behaviour as not-ferrous cast metal container, studying both the contact area and the contiguous zone of thermal diffusion. The results show that wastes can be used as a main component in the manufacture of refractory mould for casting non-ferrous metals moulded in green. © 2013 Sociedade Portuguesa de Materiais (SPM).