Reciclagem de agregados das minas da Panasqueira como revestimento refratário da fundição de metais

Abstract

Nas minas da Panasqueira (Covilhã, Portugal) acumulam-se montes de resíduos (agregados) provenientes da extração de tungsténio sem qualquer aplicação. Este trabalho pretende contribuir para implementar um novo uso para estes resíduos integrando-os como revestimento refratário no processo de moldação a verde da fundição de metais não ferrosos. Os resultados mostram o potencial do uso destes resíduos da fundição de metais não ferrosos.

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 notferrous 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.