Fused cast refractory materials refer to materials made by melting, crystallization, annealing and cold working of raw material batches. Since the energy used in the melting of batches is mainly electric energy (resistance heat, arc heat and high frequency energy of electromagnetic field), such materials are usually called fused refractory materials.
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Fusion cast refractories are classified as follows.
①According to the melting process, it can be divided into reduction casting materials and oxidation casting materials.
②According to the casting method, it can be divided into 5 categories: ordinary casting method, inclined casting method, quasi-no shrinkage casting method, no shrinkage casting method and special casting method (such as RX method). a method.
③ According to the product geometry, it is divided into 4 categories: general type, special type, special type and special type.
④According to the chemical composition and phase composition, it can be divided into 9 series, namely, fused Al2O3 series, fused Al2O3-ZrO2 series, fused A12O3-SiO2-ZrO2-Cr2O3 series, fused ZrO2 series, fused MgO series, and fused MgO series. Fused system, fused MgO-Cr2O3 system, fused Al2O3-SiO2 system and fused silica. The first four kinds of melting and casting materials are mainly used in the glass industry, and the latter are mostly used to produce high-purity raw materials to produce fused and recombined products or to be used in non-ferrous metal smelting furnaces.
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Features of different casting and fused cast refractory products:
(1) Ordinary casting (PT) products
Due to the volume shrinkage and rapid crystallization of the liquid-solid transition, the product has a certain volume of shrinkage cavities under the riser. By controlling the bulk density of the product, the products whose shrinkage cavities normally meet the technical requirements can be obtained.
(2) Inclined casting (QX) products
The inclined casting method of fused cast refractory products can make the internal shrinkage cavities deviated to the side of the product, and the bulk density of the product is equivalent to that of the PT cast product. However, the inclined casting method should not be adopted when the product length is less than 900mm.
(3) Quasi-No Shrinkage Casting (ZwS) Products
Due to the quasi-shrinkage-free casting method, most of the shrinkage cavities remain in the product riser, and only a small amount of small shrinkage cavities or loose crystals remain in the product after the riser is removed. First, by observing the size and depth of the residual shrinkage cavity, and then measuring the bulk density of the product to judge whether the product is qualified or not.
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(4) No shrinkage casting (WS) products
Due to the non-shrinkage casting method, the melt in the riser can be fully replenished into the product, and the shrinkage cavity of the product can be cut off.
The cutting surface of qualified products should have no residual shrinkage cavities, and the bulk density of the products should meet the technical requirements.
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