FINE BASALT FIBER AND METHOD OF MANUFACTURING ECOLOGICALLY CLEAN BASALT FIBROUS HEATER Russian patent published in 2001 - IPC

FIELD: manufacture of heat-insulating materials used in building materials industry. SUBSTANCE: basalt fiber based on basalt rock melt comprises wt %: SiO₂, 48-52: TiO₂, 2-3; Al₂O₃, 12.5-15.5; Fe₂O₃, 4-8; FeO, 6.5-10.5; CaO, 8.5-10.5; MgO, 5-7, MnO, 0.1-0.5; Na₂O, 1.5-3.5; K₂O, 0.5-2.5; P₂O₅, 0.2- 0.5; ZrO₂ 1-3; Cr₂O₃, CuO or mixture thereof; 0.5-2.0. Method comprises melting blend of above-indicated composition with optional addition of Li₂O, subsequently forming fibers, molding fibrous material, feeding ecologically clean composite binder, finishing carpet to final dimensions and drying said carpet. Lithium oxide is added in amount of 0.5-1 wt %, sum of Na₂O+K₂O+Li₂O being 2.5-7.0 wt %. EFFECT: reduced manufacturing cost, wider range of materials used, improved quality and better service characteristics of basalt fiber and basalt fibrous heater. 4 cl, 5 ex, 1 tbl