Patent ID: 11945745
Assignee: KNAUF INSULATION SPRL
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 15:
16. 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 submerged combustion melter, melting the mineral batch materials in the submerged combustion melter to provide a melt and fiberizing the melt to form the mineral wool fibers,
wherein the mineral batch materials introduced in to the melter comprise a first batch material and wherein:
a) the first batch material 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
0.05 to 1 wt % total iron expressed as Fe2O3, and
0 to 1 wt % fluoride; and
b) the first batch material comprises loose fibers derived from the manufacture of continuous fibers; and
c) the moisture content of the first batch material when introduced in to the submerged combustion melter is at least 10 wt %.