Low-heat-conduction fused cast zirconia-corundum compound bricks and production method thereof

Abstract

The invention discloses low-heat-conduction fused cast zirconia-corundum compound bricks and a production method thereof, wherein the dense parts of the compound bricks are groove-shaped fused cast zirconia-corundum bricks, and aluminum oxide hollow ball bricks or foamed aluminum oxide products are embedded in the groove parts. The batch formula of the fused cast zirconia-corundum groove bricks comprises 10-30% of fused cast zirconia-corundum clinker and the balance of fused cast zirconia-corundum brick formula raw materials same as the recycled clinker, wherein the clinker is prepared from 32.50% of ZrO2, 49.95% of Al2O3, 15.50% of SiO2, 1.45% of Na2O and 0.60% of other ingredients and the fused cast zirconia-corundum brick formula raw materials same as the recycled clinker comprises 34.09-43.84% of industrial aluminum oxide, 34.51-44.36% of zircon sand and 0.92-1.19% of sodium carbonate. The production method comprises dosing, fusing, casting and molding, annealing, cold machining and combining and the preparation method is characterized by fusing the batch by utilizing high-voltage and high-current fusing technology comprising synchronous oxygen blowing in the fusing period, then casting and molding, annealing and cold machining and finally compounding so as to prepare the products, wherein the fusing voltage is 260-360V, the fusing current is 2300-6000A, the casting temperature is 1760-1850 DEG C, and the casting speed is 150-1500kg / min, silicon aluminum hollow balls are used as heat preservation media in the annealing step, the temperature reduction speed in the annealing step is 0.053-0.098 DEG C / kg.h, a resin integrated sand mold is used as casting mold for casting and molding, and heat-insulation high-temperature-resistant degenerated aluminum oxide hollow ball bricks or foamed aluminum oxide products are adopted and directly embedded in the manufactured fused and cast zirconia-corundum compound brick grooves in the compounding step.

Description

Technical field: [0001] The invention belongs to the category of refractory materials, and relates to a low heat conduction fused-cast zirconium corundum composite brick and a production method. The product is mainly used for masonry superstructure of modern glass melting furnaces. Background technique: [0002] The main function of the upper structure of the glass melting furnace is to ensure the smooth spread of the combustion flame and good heat conduction, the proper temperature distribution in the furnace and the reasonable discharge of exhaust gas. Fused-cast zirconium corundum materials are widely used in the lining of the upper structure of the furnace, which can increase the life of the furnace and meet the requirements of glass melting and clarification temperature rise. Due to the melting and casting of zirconium corundum, the refractory material has a high thermal conductivity under high temperature conditions, such as 3.8-4.0W·(m·k) at 1000°C. -1 above. In ord...

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