Chromia-containing refractory
View Patent ↗A high-chromia refractory, comprised of: about 60% to about 99% by weight of refractory grain, wherein the refractory grain is comprised of grains having about 20% to 100% by weight chromia; 0% to about 35% by weight of a fine particulate, the fine particulate selected from chromic oxide, alumina, ceria, yttria, lanthanum oxide, or combinations thereof; and about 1% to about 8% of a liquid resin or pitch.
1. A high-chromia refractory, comprised of:
a mixture of,
about 60% to about 99% by weight of refractory grain, wherein said refractory grain is comprised of grains having about 20% to 100% by weight chromia;
0% to about 35% by weight of a fine particulate, said fine particulate selected from chromic oxide, alumina, ceria, yttria, lanthanum oxide, or combinations thereof; and
carbon derived from the pyrolysis of resin or pitch, said resin or pitch present in said refractory prior to pyrolysis in an amount of about 1% to about 8% by weight, said refractory grain, said fine particulate and said carbon being mixed and uniformly distributed in said refractory.
2. A high-chromia refractory, comprising:
about 60% to about 99% by weight of refractory grain, wherein said refractory grain is comprised of about 20% to 100% by weight chromia;
0% to about 35% by weight of a fine particulate, said fine particulate selected from chromic oxide, alumina, ceria, yttria, lanthanum oxide, or combinations thereof;
about 1% to about 8% by weight of a liquid resin or pitch; and
0.1% to about 10% added carbon.
3. A high-chromia refractory, comprising:
about 60% to about 99% by weight of refractory grain, wherein said refractory grain is comprised of about 20% to 100% by weight chromia;
0% to about 35% by weight of a fine particulate, said fine particulate selected from chromic oxide, alumina, ceria, yttria, lanthanum oxide, or combinations thereof;
about 1% to about 8% by weight of a liquid resin or pitch; and
0.1% to about 8% metal powders, said metal powders selected from Si, Al, Fe, Cr, Mg, alloys of Si, Al, Fe, Cr, Mg, or combinations thereof.
4. A refractory as defined in claim 1 , 2 or 3 , further comprising:
0.1% to 20% by weight of a non-chromia grain having a particle size of about 3 Tyler mesh (6.70 mm) or finer.
5. A refractory as defined in claim 4 , wherein said non-chromia grain is comprised of alumina or magnesia.
6. A refractory as defined in claim 2 , wherein said added carbon is comprised of a material selected from carbon black, graphite, coke, powdered resin, powdered pitch, or combinations thereof.
7. A refractory as defined in claim 1 , 2 or 3 , wherein said fine particulate has a particle size finer than 65 Tyler mesh (212 μm).
8. A refractory as defined in claim 1 , 2 or 3 , wherein said refractory grain is comprised of chromia-alumina.
9. A high-chromia refractory as defined in claim 1 , wherein said grain is comprised of:
about 60% to about 99% by weight of refractory grain, wherein said refractory grain is comprised of picrochromite;
0% to about 35% by weight of a fine particulate, said fine particulate selected from chromic oxide, alumina, ceria, yttria, lanthanum oxide, or combinations thereof; and
about 1% to about 8% of a liquid resin or pitch.
10. A refractory as defined in claim 1 , 2 or 3 , wherein said refractory grain is comprised of coarse grains having a particle size between about 3 Tyler mesh (6.70 mm) and 325 Tyler mesh (45 gm).
11. A refractory as defined in claim 3 , wherein said non-chromia grain has a particle size less than 3 Tyler mesh (6.70 mm).
12. A refractory as defined in claim 1 , 2 or 3 , wherein said refractory grain is comprised of refractory grains having about 65% to 100% by weight chromia.
13. A refractory as defined in claim 1 , 2 or 3 , wherein said refractory grain is comprised of grains having the same chromia content.
14. A refractory, comprised of:
about 60% to about 99% by weight of a refractory grain, wherein said refractory grain is comprised of grains having chromia contents of about 20% to about 100% by weight;
about 1% to about 6% resin or pitch;
a carbonaceous material;
metal powders selected from Si, Al, Fe, Cr, Mg, alloys of Si, Al, Fe, Cr, Mg or combinations thereof;
a fine particulate selected from chromic oxide, alumina, ceria, yttria, lanthanum oxide, or combinations thereof; and
picrochromite.
15. A refractory as defined in claim 14 , wherein said refractory grain is comprised of grains having about 65% to 100% by weight chromia.
16. A refractory as defined in claim 14 , wherein said fine particulate has a particle size less than 65 Tyler mesh.
17. A refractory as defined in claim 14 , wherein said carbonaceous material is selected from carbon black, graphite, coke, powdered resin, powdered pitch, or combinations thereof.