Unshaped refractory material

Patent metadata

Field	Value
Publication number	US-10093576-B2
Application number	US-201415123025-A
Country	US
Kind code	B2
Filing date	Mar 3, 2014
Priority date	Mar 3, 2014
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

In order to address the technical problem of allowing an unshaped refractory material using a spinel-containing alumina cement to provide further improved corrosion resistance and slag infiltration resistance while reducing the occurrence of crack/peeling, an unshaped refractory material is provided which comprises a refractory raw material mixture having a particle size of 8 mm or less, with the refractory raw material mixture having an alumina cement at least a part of which is a spinel-containing alumina cement, and, with respect to 100 mass % of the refractory raw material mixture, the alumina cement contains CaO in an amount of 0.5 to 2.5 mass %, and the spinel-containing alumina cement contains spinel in an amount of 3.5 to 10.5 mass %.

First claim

The invention claimed is:

1. An unshaped refractory material including a refractory raw material mixture having a particle size of 8 mm or less, the refractory raw material mixture comprising:
an alumina cement, at least a part of which is a spinel-containing alumina cement, wherein, with respect to 100 mass % of the refractory raw material mixture, the alumina cement contains CaO in an amount of 0.5 to 2.5 mass %, and the spinel-containing alumina cement contains spinel in an amount of 3.5 to 10.5 mass %; and
a spinel raw material having a particle size of 0.1 mm or less, wherein, with respect to 100% mass of the refractory raw material mixture, a total content of the spinal raw material and the spinel contained in the spinel-containing alumina cement is in a range of 5.5 to 22 mass %.

2. The unshaped refractory material of claim 1 , wherein the refractory raw material mixture further comprises calcined alumina having a particle size of 3 μm or less, wherein, with respect to 100 mass % of the refractory raw material mixture, a content of the calcined alumina is 10 mass % or less.

3. The unshaped refractory material of claim 1 , wherein the refractory raw material mixture further comprises calcined alumina having a particle size of 3 μm or less, wherein, with respect to 100 mass % of the refractory raw material mixture, a content of the calcined alumina is less than 4 mass %.

4. The unshaped refractory material of claim 1 , wherein the refractory raw material mixture further comprises at least one of an alumina raw material and a spinel raw material, each having a particle size of greater than 0.1 mm to 8 mm, wherein, with respect to 100 mass % of the refractory raw material mixture, a total content of the at least one alumina raw material and the spinel raw material is in a range of 50 to 75 mass %.

5. The unshaped refractory material of claim 2 , wherein the refractory raw material mixture further comprises at least one of an alumina raw material and a spinel raw material, each having a particle size of greater than 0.1 mm to 8 mm, wherein, with respect to 100 mass % of the refractory raw material mixture, a total content of the at least one alumina raw material and the spinel raw material is in a range of 50 to 75 mass %.

6. The unshaped refractory material of claim 3 , wherein the refractory raw material mixture further comprises at least one of an alumina raw material and a spinel raw material, each having a particle size of greater than 0.1 mm to 8 mm, wherein, with respect to 100 mass % of the refractory raw material mixture, a total content of the at least one alumina raw material and the spinel raw material is in a range of 50 to 75 mass %.

7. An unshaped refractory material including a refractory raw material mixture having a particle size of 8 mm or less, the refractory raw material mixture comprising:
an alumina cement, at least a part of which is a spinel-containing alumina cement, wherein, with respect to 100 mass % of the refractory raw material mixture, the alumina cement contains CaO in an amount of 0.5 to 2.5 mass %, and the spinel-containing alumina cement contains spinel in an amount of 3.5 to 10.5 mass %; and
a magnesia raw material having a particle size of 0.1 mm or less, wherein, with respect to 100 mass % of the refractory raw material mixture, a content of the magnesia raw material is in a range of 2 to 9 mass %.

8. The unshaped refractory material of claim 7 , wherein the refractory raw material mixture further comprises calcined alumina having a particle size of 3 μm or less, wherein, with respect to 100 mass % of the refractory raw material mixture, a content of the calcined alumina is 10 mass % or less.

9. The unshaped refractory material of claim 7 , wherein the refractory raw material mixture further comprises calcined alumina having a particle size of 3 μm or less, wherein, with respect to 100 mass % of the refractory raw material mixture, a content of the calcined alumina is less than 4 mass %.

10. The unshaped refractory material of claim 7 , wherein the refractory raw material mixture further comprises at least one of an alumina raw material and a spinel raw material, each having a particle size of greater than 0.1 mm to 8 mm, wherein, with respect to 100 mass % of the refractory raw material mixture, a total content of the at least one alumina raw material and the spinel raw material is in a range of 50 to 75 mass %.

Assignees

• Krosakiharima Corp

Inventors

• Goda Koji
• Sasatani Yoshihiro
• Uemura Koichi

Classifications

• C04B2111/00431

  Refractory materials · CPC title

• C04B2235/3208

  Calcium oxide or oxide-forming salts thereof, e.g. lime · CPC title

• C04B2235/5427

  millimeter or submillimeter sized, i.e. larger than 0,1 mm · CPC title

• C04B2235/3418

  Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint · CPC title

• C04B35/62665

  Flame, plasma or melting treatment · CPC title