Fused cast refractories for refining outside the furnace
Refractories for refining outside the furnace are a kind of materials with great resistance to thermal shock, creep, wear and corrosion of molten metal. They are widely used in the nonferrous metal refining industry because of the characteristics of the inherent properties that can effectively resist the physical and chemical phenomena caused by the extremely high temperatures of molten metal, slag, gas and other substances. This article will focus on the composition and application of fused cast refractories used in the refining outside the furnaces.
Fused cast refractories are made of high-alumina clinker and other additives. The high-alumina clinker is used as the basic component and is formed by electric furnace operation. The high-Al2O3 content of the clinker determines the chemical properties, physical properties and applicability of the refractory materials. In addition to high Al2O3 content, the additives are also necessary in the preparation of fused cast refractories. The added additives can increase the strength, permeability and density of the refractory material, and also can adjust the using temperature. The commonly used additives include oxides of magnesia, chrome, zirconium and fluoride.
When choosing fused cast refractories for refining outside the furnace, the high temperature slag environment and chemical reaction situation in the furnace must be taken into consideration. It is also necessary to consider the thermal shock resistance and basic slag resistance of the refractory material to ensure effective performance. In addition, it is also important to consider the cycle life, installation cost and maintainability of the refractory. In general, fused cast refractories used in refining outside the furnace should have good combination of high temperature strength and hot corrosion resistance.
In the refining outside the furnace, fused cast refractories used for different purposes have different properties. Using appropriate refractories with required basic material ratio, characteristics and improving measures can significantly reduce the cost of molten metal refining and improve the production quality. Fused cast refractories are applied in many areas in the refining outside the furnace, such as furnace interior, furnace wall, furnace bottom, furnace gate and furnace hearth. The linings made of fused cast refractories have the advantages of high temperature resistance, oxidation resistance and corrosion resistance, which can effectively protect the furnace and significantly reduce the cost.
In addition, fused cast refractories are also used in the cleaning lines of refined metals and alloys, such as aluminum, copper, magnesium and stainless steel. In these cleaning lines, fused cast refractories are used as anti-leaching molds and plugs, to ensure the purity of the metals and alloys. The special refractory products with good high temperature properties and corrosion resistance can also be used as pre-casting blocks and connectors for the casting of various refined metals and alloys.
Fused cast refractories are widely used in refining outside the furnace because of their good thermal shock resistance, corrosion resistance and wear resistance. With the ever-improving process technology, the variety and improve of application of fused cast refractories for refining outside the furnace are also increasing. In the future, fused cast refractories will continue to be widely used in the metallic non-ferrous metal refining industry, and provide better and better performance in the refining process.
