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2020
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06
Refractory Materials and Performance Requirements for Side-Blown Furnaces
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The side-blown furnace is rectangular and consists primarily of a furnace bottom, furnace shell, hearth, furnace body, and furnace roof. Inside the furnace body are spray guns and a molten pool area, while the exterior is encased in a robust steel shell reinforced by water-cooled jackets. The interior is lined with refractory materials, which directly endure exposure to high-temperature slag, molten lead, and intense combustion flames. Consequently, the service life of these refractory materials directly determines the overall lifespan of the reduction furnace.
Side-blown furnace It is rectangular and primarily consists of the furnace bottom, furnace shell, hearth, furnace body, and furnace roof. Inside the furnace body are the burner nozzles and the molten pool area, while the exterior is encased in a robust steel shell reinforced by a water jacket. Internally, the structure is built with refractory materials. Since these refractories are in direct contact with high-temperature slag, molten lead, and burning flames, the service life of the refractory materials directly determines the operational lifespan of the reduction furnace.
Side-blown furnace The refractory material used is magnesium oxide brick, made from magnesium oxide. MgO ) and chromium trioxide ( CrO2 ) is primarily composed of perovskite and spinel as its main mineral constituents. It exhibits high refractoriness, superior strength at elevated temperatures, strong resistance to alkaline slags, excellent thermal stability, and a degree of adaptability to acidic slags.
Commonly used Side-blown furnace The physicochemical indicators of the refractory material are:
( 1 ) Refractoriness: The ability to resist softening or melting at sufficiently high temperatures, characterized by the refractoriness index.
( 2 ) Load softening temperature: The ability to withstand heavy loads and other thermomechanical stresses at high temperatures without losing structural strength or collapsing. The characteristic indicator is the load softening temperature.
( 3 ) High-temperature volume stability: During operation, there should be no excessive expansion or contraction in volume, as this could compromise the structural integrity or sealing performance of high-temperature equipment. The key indicator for assessing this property is the change in the re-burning line.
( 4 ) Thermal shock resistance: The ability to withstand rapid temperature changes without cracking or spalling, characterized by the coefficient of thermal expansion and the thermal shock resistance index.
( 5 ) Slag resistance: The ability to withstand the chemical action of various corrosive substances without damage during use.
( 6 ) Wear resistance: The ability to withstand direct erosion or abrasion caused by high-speed flowing flames, flue gases containing solid particles, liquid metals, slag, and solid materials.
Side-blown furnace The physicochemical indicators for magnesia-chrome refractory bricks are: softening start temperature ≥ 1700 ℃, Thermal Shock Stability 1100 ℃, Water cooling ≥ 7 Twice, bulk density 3.44 g/cm³ 。
Side-blown furnace
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