Flexible self-expansion temperature-resistant sealing element for continuously casted long nozzle and preparation method thereof

Abstract

The invention discloses a flexible self-expansion temperature-resistant sealing element for continuously casted long nozzle and a preparation method thereof. The sealing element comprises a sealing element body composed of a flexible self-expansion inorganic sealing material and graphite paper arranged on the surface of the body. The flexible self-expansion inorganic sealing material includes inorganic lean powder with certain components, expanded graphite, clay, reinforcing fibers and a carbon material and additionally includes an organic binder, a sintering auxiliary agent, an anti-oxidant,a dispersant, a film-forming auxiliary agent and a flame retardant. The method includes the steps: preparing the raw materials according to the mass percentage, fully mixing evenly, adding the organicbinder and wet-milling fully, to obtain the flexible self-expansion inorganic sealing material; putting the material into a stamping die, clamping the die, and stamping to obtain the sealing elementbody; and after demoulding, drying and solidifying to obtain the sealing element finished product. The sealing element has the advantages of good sealing performance, good temperature resistance, corrosion resistance, friction resistance, flexible self-expansion, and low cost. The method is convenient to manufacture and has certain versatility.

Description

technical field [0001] The invention relates to the technical field of continuous casting seals and their production, in particular to a flexible self-expanding heat-resistant sealing element for continuous casting shrouds and a preparation method thereof. Background technique [0002] In the continuous casting process, the steel end of the long nozzle is connected to the lower nozzle of the ladle sliding mechanism, and the tapping end is immersed in the molten steel in the tundish. The molten steel is injected into the shroud from the ladle through the lower nozzle and flows quickly in the inner cavity of the shroud. The Venturi effect causes the inner cavity of the shroud to form a "vacuum area", and the negative pressure is generated at the connection of the steel end, which is very easy to inhale air and cause oxidation of the molten steel. Nitrogen increases, and some steel types are also prone to nodulation and blockage of submerged nozzles. [0003] The non-oxidation...

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Problems solved by technology

[0008] Chinese patent application (CN101856719A) discloses a sealing bowl refractory material for continuous casting ladle shroud and its manufacturing method. In this application, inorganic refractory material is introduced into the shroud sealing element instead of fiber, but it lacks self-expandability and requires compounding technology

[0009] Chinese patent application (CN105202183A) discloses a high-temperature-resistant sealing gasket for casting. This gasket may be suitable for the casting system of the sandbox casting, but it cannot be applied to the high-temperature sealing of the continuous casting shroud due to the use of rubber.

[0010] The invention patent application of the Chinese patent (CN1916450A) discloses a high-temperature resistant inorganic gasket and its preparation method. The gasket is suitable for equipment covers with a high temperature of 420°C, and cannot be applied to the sealing of continuous casting steel shrouds.

These two sealing elements are based on high-alumina clinker, graphite is a flexible material, clay provides a certain degree of plasticity, metal aluminum powder is used as an antioxidant to prevent oxidation of carbon materials, and glass components strengthen high-temperature sintering and block pores, but do not have Self-expanding and good separation performance

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