Glassy calcium silicate fibers made from phosphorus slag
AssigneeDyckerhoff Zementwerke Aktiengesellschaft
InventorEberhard Rauschenfels
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Abstract
In a building material comprising an inorganic binder selected from the group consisting of Portland cement, alumina cement, calcium silicate, lime and gypsum, structurally reinforced with glass fibers, the improvement which comprises employing as said glass fibers alkali-resistant calcium silicate glass fibers spun and drawn from molten phosphorus slag, said fibers consisting essentially of approximately ______________________________________ CaO 10-60% by weight SiO.sub.2 35-70 Al.sub.2 O.sub.3 1-10 ZnO+ZrO.sub.2 +Cr.sub.2 O.sub.3 +TiO.sub.2 0.1-10 Fe.sub.2 O.sub.3 and Na.sub.2 O <2. ______________________________________
Claims2
In the production of phosphorus wherein a phosphorus-containing material is electrothermally processed to produce phosphorus and a molten slag, the phosphorus is separated and the molten slag is solidified, the improvement which comprises adjusting the SiO.sub.2 content and adding to the separated slag at least one modifying oxide selected from the group consisting of ZnO, ZrO.sub.2, Cr.sub.2 O.sub.3 and TiO.sub.2 to form a molten mass having the approximate composition
- ______________________________________ CaO [10-60] 20-35 by weight SiO.sub.2 [35-70] 40-60 Al.sub.2 O.sub.3 1-10 ZnO+ZrO.sub.2 +Cr.sub.2 O.sub.3 +TiO.sub.2 0.1-10 oxide impurities, <2, Fe.sub.2 O.sub.3 and Na.sub.2 O ______________________________________
- the weight ratio for CaO:
- SiO.sub.2 being about 1:2, and solidifying said mass by melt spinning and attenuating to form calcium silicate glass fibers.
Dependencies are inferred from the claim text.