Fired pyrophyllite silicon carbide brick and preparation method thereof

Abstract

The invention provides a fired pyrophyllite silicon carbide brick, which comprises pyrophyllite raw ore (Al2O3.4SiO2.H2O), SiC, light clay, and additives. The preparation method of the fired pyrophyllite silicon carbide brick invention realizes energy consumption lowering and pollution reduction.

Description

technical field [0001] The invention belongs to the technical field of preparation of refractory inner lining materials, and in particular relates to a preparation method of fired alabaster silicon carbide bricks. Background technique [0002] In the iron and steel smelting process, the ladle is a container for high-temperature molten iron (1400-1500°C). The inner layer of the ladle is provided with a working layer of refractory material, and the refractory material of the working layer is in direct contact with the high-temperature molten iron during use. , the refractory material of the working layer below the molten iron level is required to have high refractoriness, strength, resistance to molten iron erosion, high resistance to chemical erosion of molten iron or iron slag, and low porosity; it is required to be above the molten iron level The refractory material of the working layer has high strength, resistance to molten iron erosion, and non-sticky slag. [0003] At ...

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Problems solved by technology

[0004] However, this type of refractory material has the following problems: the graphite in the refractory material of the working layer of the ladle will be oxidized during the use of the ladle, and the high-temperature molten iron contains free oxygen, which will produce carbon monoxide or carbon dioxide, and the generated gas will cause pollution. Environmental protection is inconsistent; Al 2 o 3 -The brown corundum and super-grade high-alumina bauxite raw materials used in the production of SiC-C bricks are made by processing high-alumina bauxite raw ore through high-temperature firing and electric melting. A large amount of polluting gas and high energy consumption; the above-mentioned oxidation reaction causes pores or holes in the refractory material of the working layer. When in use, high-temperature molten iron or slag liquid is more likely to penetrate into the refractory material and cause erosion and damage to the refractory material. At the same time, the refractory material The particles and fine powder on the surface are exposed in the high-temperature molten iron and are gradually washed away, causing damage to the refractory material; the refractory mineral particles, fine powder and unoxidized graphite entering the high-temperature molten iron pollute the high-temperature molten iron, enabling The consumption increases due to the removal of these impurities in the molten iron; the graphite powder is relatively light, and it is easy to generate dust during the production of this type of refractory material, which increases the burden of dust removal on the job site and is not good for the health of the workers on the production site; the molten iron is pretreated A large amount of slag is produced during the process, and the slag floats above the surface of the molten iron. The slag has a high viscosity and adheres to the surface of the inner layer. It is necessary to carry out slag removal operations, and at the same time destroy the surface layer of the inner refractory material, so that the inner layer above the molten iron level The first layer of refractory material is damaged quickly, and maintenance is required to increase the use of refractory materials and increase the consumption of resources