| 摘要 |
Man-made vitreous fibres having a composition comprising 16 to 23 % alumina and 4 to 8 % alkali oxides are produced from a charge which comprises molded briquettes comprising at least 5 wt.% of a material selected from (a) alkali feldspar, nepheline, leucite and sodalite (mineral concentrates), (b) syenite nepheline syenite, phonolite, alkali basalt and other natural rocks containing at least 40 % alkali feldspar and (c) front screen glass waste and mixtures thereof. |
