	US 11,945,745 B2
	Mineral wool
Gerard Demott, Majcichov (SK); and Mitja Oresnik, Skofja Loka (SI)
Assigned to Knauf Insulation SPRL, Vise (BE)
Appl. No. 16/488,283
Filed by KNAUF INSULATION SPRL, Vise (BE)
PCT Filed Feb. 23, 2018, PCT No. PCT/EP2018/054581 § 371(c)(1), (2) Date Aug. 23, 2019, PCT Pub. No. WO2018/154077, PCT Pub. Date Aug. 30, 2018.
Claims priority of application No. 1703054 (GB), filed on Feb. 24, 2017.
Prior Publication US 2021/0139369 A1, May 13, 2021
Int. Cl. C03C 13/06 (2006.01); C03C 3/091 (2006.01); C03C 3/118 (2006.01)

CPC C03C 13/06 (2013.01) [C03C 3/091 (2013.01); C03C 3/118 (2013.01)]

16 Claims

1. A method of making mineral wool fibers comprising:

55 to 75 wt % SiO₂, and

5 to 20 wt % of the combination of CaO and MgO, and

5 to 20 wt % of the combination of Na₂O and K₂O, and

0 to 5 wt % Al₂O₃, and

up to 2 wt % total iron expressed as Fe₂O₃, and

an alkali/alkaline-earth ratio expressed in terms of wt % of alkali metal oxides/wt % of alkaline-earth metal oxides which is >1,

the method comprising:

introducing mineral batch materials in to a melter, the mineral batch materials comprising a first batch material and a second batch material, and melting the mineral batch materials to provide a melt and fiberizing the melt to form the mineral wool fibers,

wherein

the first batch material consists essentially of scrap from the manufacture of mineral fibers and which comprises:

52 to 62 wt % SiO₂, and

12 to 16 wt % Al₂O₃, and

16 to 25 wt % CaO, and

0 to 5 wt % MgO, and

4 to 10 wt % B₂O₃, and

0 to 2 wt % of the combination of Li₂O+Na₂O+K₂O, and

0 to 1.5 wt % TiO₂, and

0.005 to 1 wt % total iron expressed as Fe₂O₃, and

0 to 1 wt % fluoride.