US 11,746,053 B2
Refractory compositions and in situ anti-oxidation barrier layers
Beda Mohanty, Perrysburg, OH (US); Daniel T Schaner, Medina, OH (US); and Roger L Maddalena, Pittsburgh, PA (US)
Assigned to Vesuvius USA Corporation, Champaign, IL (US)
Appl. No. 16/961,823
Filed by VESUVIUS USA CORPORATION, Champaign, IL (US)
PCT Filed Jan. 29, 2019, PCT No. PCT/US2019/015580
§ 371(c)(1), (2) Date Jul. 13, 2020,
PCT Pub. No. WO2019/156845, PCT Pub. Date Aug. 15, 2019.
Claims priority of provisional application 62/628,487, filed on Feb. 9, 2018.
Prior Publication US 2021/0002176 A1, Jan. 7, 2021
Int. Cl. C04B 35/101 (2006.01); C04B 35/622 (2006.01); B22D 41/02 (2006.01); C22C 1/10 (2006.01)
CPC C04B 35/1015 (2013.01) [B22D 41/02 (2013.01); C04B 35/62222 (2013.01); C22C 1/1015 (2013.01); C22C 1/1036 (2013.01); C04B 2235/3201 (2013.01); C04B 2235/3206 (2013.01); C04B 2235/3208 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/3232 (2013.01); C04B 2235/3272 (2013.01); C04B 2235/3418 (2013.01); C04B 2235/786 (2013.01); C04B 2235/9676 (2013.01); C22C 1/1021 (2023.01)] 14 Claims
 
1. A refractory composition for forming a working lining in a metallurgical vessel, the refractory composition comprising, in percent by total mass of the refractory composition:
at least 20.0% coarse-grain refractory particles having a particle size of at least 150 micrometers (+100 mesh), wherein the coarse-grain refractory particles include alumina particles, and further comprises magnesia particles, magnesium aluminate spinel particles, zirconia particles, or doloma particles, or a combination of any thereof;
at least 0.25% titanium dioxide; and
one or more of:
(i) at least 0.5% additive calcium oxide, fine-grain refractory particles having a particle size of less than 150 micrometers (-100 mesh); or
(ii) at least 5.0% low-magnesia oxide, fine-grain refractory particles having a particle size of less than 150 micrometers (-100 mesh), the low-magnesia oxide containing less than 50% magnesia by total mass of the low-magnesia oxide; or
(iii) at least 0.25% additive calcium oxide and at least 5.0% low-magnesia oxide, fine-grain refractory particles having a particle size of less than 150 micrometers (-100 mesh); and
wherein the refractory composition comprises, in percent by total mass of the refractory composition:
at least 80.0% alumina comprising coarse-grain alumina particles and fine-grain alumina particles, wherein the coarse-grain alumina particles of the at least 80% alumina concurrently include the alumina particles comprised within the at least 20.0% coarse-grain refractory particles having the particle size of at least 150 micrometers (+100 mesh);
up to 3.0% silica;
up to 0.5% iron (III) oxide;
0.5-5.0% calcium oxide;
at least 0.1% magnesia;
up to 1.0% alkali oxides; and
from 0.25 up to 15.0% titanium dioxide.