Prefabricated member and large blast furnace swing spout employing same

Abstract

The invention discloses a large blast furnace swing spout. The large blast furnace swing spout comprises a steel mould, a brick layer, working layers and the prefabricated member; the steel mould and the brick layer respectively have two side faces and a bottom; the brick layer is paved in the steel mould; the working layers are poured on inner sides of the two side faces of the brick layer; and the prefabricated member is arranged on the bottom of the brick layer, and comprises the following components in percentage by mass: 50 to 55 percent of compact alumina or brown alumina, 18 to 22 percent of silicon carbide, 8 to 12 percent of white alumina, 6 to 9 percent of alpha-Al2O3 micropowder, 1 to 3 percent of silica micropowder, 2 to 4 percent of pure calcium aluminate cement, 1 to 5 percent of ball pitch, 2 to 4 percent of silicon metal powder, 1 to 1.5 percent of nano silica-alumina gel powder, 0.5 to 0.8 percent of boron nitride, 1 to 1.2 percent of yttrium oxide, 0.5 to 0.8 percent of zirconium oxide, 2 to 2.5 percent of compound additive and 0.3 to 0.5 percent of compound anti-blasting material. By the invention, the consumption of refractory materials and the labor intensity of workers are reduced, the service life of the whole swing spout is prolonged, and the economic benefit of a steel mill is improved.

Description

【Technical field】 [0001] The invention relates to the field of refractory materials for blast furnace ironmaking, in particular to the improvement of the structure and formula of the falling iron part (or called: the falling iron point) of a swing nozzle of a large blast furnace. 【Background technique】 [0002] In recent years, in response to the country's energy-saving and emission-reduction requirements, newly-built blast furnaces have been developing toward large-scale and automated development, while reducing harmful gas emissions, reducing the labor intensity of furnace front workers, and improving the safety of production sites have also received widespread attention. This makes higher requirements for various production and construction processes including the swing nozzle. [0003] At the present stage, the main construction technology of the swing nozzle is to use ramming material or castable as a whole for pouring. When the iron is tapped, a certain amount of molte...

AI Technical Summary

Problems solved by technology

Since the falling iron point is the main part of the swing nozzle wear, while other parts wear very little, so the overall service life of the swing nozzle is greatly limited, and the swing nozzle needs to be repaired as a whole, resulting in frequent repairs and labor-intensive workers. Large, high consumption of refractory materials

After the repair is completed, if the baking is not done properly, it is easy to form cracks, which brings safety hazards to the normal tapping of the blast furnace.

At this stage, there are also manufacturers on the market that make the overall prefabricated part of the swing nozzle, which is characterized by a short replacement time, but due to the large size, it is inconvenient to install and replace, and when repairing the position of the iron drop point, the swing nozzle needs to be repaired and maintained as a whole or Replacement does not fundamentally solve the shortcoming of the short service time of the iron point of the swing nozzle, and the waste of materials is large

[0004] Therefore, how to develop a construction and repair technology for the falling iron point of the swing nozzle, and properly solve the disadvantages of excessive wear at the falling iron point of the swing nozzle, thereby prolonging the overall service life of the swing nozzle and solving the contradiction between repair and blast furnace production, It is the key to the technical upgrading and transformation of the current swing nozzle products, energy saving and emission reduction

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