Special casting materials for triangular area prefabricated components of electric arc furnace roof

Abstract

The invention discloses special casting materials for triangular area prefabricated components of an electric arc furnace roof. The special casting materials are prepared from the following raw materials: 20-35 parts of highly pure aluminum bauxite, 10-25 parts of tabular corundum, 15-32 parts of chromium corundum, 3-5 parts of spinel fine powder, 1.5-2.5 parts of kyanite, 5-9 parts of active aluminum oxide micro powder, 1-3 parts of chromium oxide green fine powder, 2-4 parts of silicon micro powder, 3.11-5.25 parts of a bonding agent, 0.03-0.06 part of organic fibers and 0.5-1 part of stainless steel fibers. According to the special casting materials disclosed by the invention, scientific grain size distribution is adopted for main body granules, so that the triangular area prefabricatedcomponents are guaranteed to have good high temperature strength and good hot vibration stability; materials of the spinel micro powder, pure calcium aluminate cement, active aluminum oxide and chromium oxide green and the like, which are added, are compounded, and after casting moulding and baking, a high-strength low-temperature solidified combination liner is formed, so that the compactabilityand the volume stability of the prefabricated components are guaranteed; the chromium corundum (Al2O3+Cr2O3 greater than or equal to 95%) in the raw materials is slag for smelting electrofusion chromium metal; through the use of the raw materials, the cost of products can be reduced, discharge of industrial waste can be reduced, and cyclic utilization of the industrial waste can be effectively realized.

Description

technical field [0001] The invention relates to a refractory material for an electric arc furnace, in particular to a special pouring material for a prefabricated part in the triangular area of ​​the top of an electric arc furnace. Background technique [0002] Electric arc furnace is one of the important equipment used in iron and steel smelting. With the rapid development of my country's iron and steel industry, the smelting process is also constantly innovating, and the electric arc furnace is also developing towards large-scale and ultra-high power, and the requirements for electric arc furnace refractory materials are also getting higher and higher. The electric arc furnace cover (also known as furnace roof) is an extremely important part of the electric arc furnace. Its service life seriously affects the operation rate of the electric arc furnace, and has a great impact on the quality of molten steel and safe production. The structure of the electric arc furnace cover...

AI Technical Summary

Problems solved by technology

The structure of the electric arc furnace cover is as follows: figure 1 As shown, there are electrode holes and feeding holes on it. During its working process, the center of the furnace cover (commonly known as the triangle area of ​​the furnace roof) is unfavorable due to the structure, and is vulnerable to high-temperature radiation and slag erosion of the arc, and The alternating cycle of cold and heat causes the central area to be easily damaged, which in turn leads to the instability of the overall structure of the entire furnace cover and rapid damage, which reduces the service life of the furnace cover

In particular, the increase in high-power and ultra-high-power electric arc furnace steelmaking has greatly reduced the life of the electric arc furnace cover. Therefore, the traditional furnace cover triangular area made of high-alumina, aluminum-magnesium and other prefabricated bricks can no longer meet the needs of arc furnaces. Requirements for the use of furnace steelmaking

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