Corundum refractory products, Al2O3 98% or more, self-bonded solid phase sintered high-purity corundum brick products, the bonding phase is mainly corundum, and there is a small amount of mullite, etc. Mainly used in petrochemical industry gasification furnace, carbon black reactor, gasification furnace, ammonia decomposition furnace, two-stage reforming furnace, high temperature and ultra-high temperature kiln in refractory ceramic industry, blast furnace in metallurgical industry, etc.
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| Rongsheng Corundum Bricks |
Corundum Bricks Shaped Products
Modified high alumina bricks
①Low creep high alumina bricks: For high alumina bricks with a creep temperature of 1500℃-1550℃, adding some fused corundum and silica raw materials can produce low creep rate high alumina bricks.
②Phosphate bonded high alumina bricks: Special-grade or first-grade high alumina bauxite clinker is used as the main raw material, and phosphoric acid solution or aluminum phosphate solution is used as the binder. A small amount of fused corundum, mullite, etc. is added to strengthen the matrix. Chemically bonded refractory products made by heat treatment at 400-600℃. Mainly used in ironmaking hot blast furnaces, cement kilns, electric furnace tops, ladles, etc.
Corundum mullite bricks
Use fused white corundum, plate-shaped corundum, fused mullite and other raw materials. After batching, mixing, high-pressure molding, and firing in a high-temperature kiln. The main crystal phase of corundum mullite brick products is corundum, and the bonding phase is mullite. Corundum mullite bricks are mainly used in high-temperature firing kilns and kiln tools such as push plates and firing plates in the ceramic industry.
Plate-shaped corundum mullite brick
Plate-shaped corundum mullite brick is made of plate-shaped corundum as the main raw material and mullite as the auxiliary raw material. It is made by adding appropriate amounts of high-purity alumina, ultrafine silicon oxide powder and additives. It is strongly pressed and formed by a 300t friction press and fired at high temperature in an oxidizing atmosphere. Plate-shaped corundum mullite brick can be used for a long time in a high temperature environment of 1700 degrees. Characteristics of plate-shaped corundum mullite brick:
(1) The Al2O3 of plate-shaped corundum mullite brick is ≥82%, which has good high temperature resistance, high refractory temperature, and load softening temperature as high as 1700 degrees.
(2) Resistant to chemical erosion, with strong resistance to acidic solutions or slag.
(3) The Fe2O3 content in plate-shaped corundum mullite brick is ≤0.5%, which is resistant to oxidation. It is not easy to react chemically with gases such as O2, H2, and CO.
(4) Good thermal stability, high temperature volume stability, and not easy to expand or shrink.
(5) Good thermal shock resistance, 1100℃ water cooling ≥30 times, resistant to rapid cooling and heating, not easy to peel off.
(6) High compressive strength at room temperature, ≥ 85 MPa, not easy to wear during transportation or unloading.
Physical and chemical indicators of plate-shaped corundum mullite bricks
Project indicators Al2O3, %≥82Fe2O3, %≤0.5Load softening temperature, ℃1700 (0 deformation) Thermal shock stability, times, 1100℃ water cooling ≥30 Normal temperature compressive strength, MPa≥85 Creep rate, %, 1450℃×50h-0.05 High temperature flexural strength, MPa, 1450℃×0.5h≥10
Application of plate-shaped corundum mullite bricks
Plate-shaped corundum mullite bricks can directly contact flames, resist peeling, and resist high temperatures. It can be used as the thermal insulation lining of high-temperature industrial furnaces and as the working layer of other industrial high-temperature kilns. It is mainly used in petrochemical industry, large and medium-sized synthetic ammonia gasification furnaces and magnetic material gas furnace materials, high-temperature industrial kiln supporting facilities materials, etc. Rongsheng Refractory can customize refractory bricks and products of various materials and shapes according to the customer's high-temperature equipment requirements.
