METHOD OF MANUFACTURING MINERAL FIBERS FROM BASALT ROCKS Russian patent published in 2004 - IPC

FIELD: mineral fibers. SUBSTANCE: invention relates to manufacture of continuous and staple mineral fibers from basalt rocks with elevated strength and chemical stability, which may find use in manufacture of building materials with heat- and sound-insulation properties, in power engineering, and other areas. Rock used in claimed method includes SiO₂, Al₂O₃, CaO, MgO, Fe₂O₃, K₂O and Na₂O, and principal glass-forming and alkali metal oxides are contained in following proportions: 61- 64% SiO₂ and 9.0-9.2% K₂O+Na₂O. EFFECT: increased strength and chemical stability. 1 tbl, 3 ex