BRIQUETAS PARA LA PRODUCCION DE FIBRAS MINERALES Y SU UTILIZACION

Procedimiento de producción de fibras vítreas artificiales que comprende proporcionar una carga mineral que incluye briquetas, fundir la carga para proporcionar una masa fundida, y transformar la masa fundida en fibras, caracterizado porque las briquetas comprenden por lo menos el 5% en peso de la briqueta del mineral que contiene alúmina en partículas que contiene entre 0, 5 y 10% en peso de aluminio metálico, entre 50 y 90% en peso de alúmina Al2O3 y entre 0 y 49, 5% en peso de otros materiales. The present invention relates to a process of producing man-made vitreous fibres having a composition which contains at least 14% aluminium measured as weight Al 2 O 3 based on oxides, comprising providing in a shaft furnace a self-supporting stack of mineral charge which includes briquettes, melting the charge to provide a melt at the base of the furnace having the composition of the fibres, removing melt from the base of the furnace and fiberising the melt, characterised in that at least one quarter of the aluminium in the charge is introduced as particulate alumina-containing mineral in briquettes and the particulate alumina-containing mineral contains from 0.5 to 10 wt.% metallic aluminium, 50 to 90 wt.% alumina Al 2 O 3 and 0 to 49.5 wt.% other materials.