Refractory products with alumina content greater than 90% and corundum as the main crystal phase. Very high normal temperature compressive strength (up to 340MPa). High load softening start temperature (more than 1700°C). Very good chemical stability, strong resistance to acidic or alkaline slag, metal and glass liquid. Thermal shock stability is related to its structure. The corrosion resistance of dense products is good, but thermal shock stability is poor. There are two types of sintered corundum bricks and fused corundum bricks. Sintered alumina and fused corundum can be used as raw materials, or bauxite clinker with high Al2O3/SiO2 ratio can be combined with sintered alumina and made by sintering method. Phosphoric acid or other bonding agents can also be used to make non-fired corundum bricks. Mainly used in iron-making blast furnaces and blast furnace hot-blast furnaces, refining furnaces outside steel-making furnaces, sliding water heaters, glass melting furnaces, and petrochemical industrial furnaces.
Corundum bricks are widely used in blast furnaces, hot blast furnaces in the metallurgical industry, secondary furnaces, gasifiers, gas generators, cracking furnaces in the petrochemical industry, and various high-temperature heating furnaces in various industries such as ceramics, building materials, military industry, and scientific research. In addition to being restricted by various technological conditions, the corundum bricks on various kilns are also subject to the erosion and destruction of high temperature, high pressure, slag and strong reducing gases. This chemical attack and structural damage to the corundum bricks reduces the service life of the corundum bricks.There are two types of sintered corundum bricks and fused corundum bricks. Sintered alumina and fused corundum can be used as raw materials, or bauxite clinker with high Al2O3/SiO2 ratio can be combined with sintered alumina and made by sintering method. Phosphoric acid or other bonding agents can also be used to make non-fired corundum bricks.
The corundum bricks are based on alumina and a small amount of additives are added to utilize the excellent anti-corrosion properties of alumina to improve the ability of the brick lining to resist high-temperature molten iron. At present, the application of corundum bricks is mainly in the form of ceramic cups and carbon bricks. The ceramic cup structure refers to the construction of ceramic materials on the inner side of the charcoal bricks of the hearth of the blast furnace. The excellent anti-corrosion ability of the ceramic materials is used to separate the charcoal bricks from the molten iron, slowing the corrosion of the molten iron to the sidewall of the hearth, and corroding the 800℃ isotherm. The thread stays in the ceramic cup, which reduces the corrosion of the alkali metal to the carbon brick.
In addition, due to the large temperature changes in the aluminum smelting process, the lining refractories used in the aluminum smelting furnace should have the characteristics of not peeling off under the condition of sudden temperature changes and good thermal shock resistance. It can be seen that a corundum refractory material that does not cause metal aluminum to be invaded by impurities and has high thermal shock resistance is an important refractory material for the production of high-purity aluminum. The Al2O3 content in this corundum refractory material is greater than 94%, and it has high thermal shock resistance.
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