| 摘要 |
The present invention relates to a process of producing man-made glass fibers having a composition which contains at least 14 percent aluminium measured as weight Ali2Oi3 based on oxides, comprising providing in a shaft furnace a self-supporting stack of mineral charge which includes at least partially briquettes, melting the charge to provide a melt at the base of the furnace having the composition of the fibers, removing the melt from the base of the furnace and spinning 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 percent by weight of metallic aluminium, 50 to 90 percent by weight of alumina Ali2Oi3 and 0 to 49.5 percent by weight of other materials. |
