Method for systematically prolonging service life of bottom-spraying of converter

Abstract

The invention belongs to the technical field of steelmaking production, and discloses a method for systematically prolonging the service life of bottom-spraying of a converter. The method adopts a machining process route of an existing seat brick, and changes a core raw material of the seat brick, ensures the strength and oxidation resistance of a core; in the service period of the converter, a seventh ring brick is embedded with a trunnion connecting line as a starting point, one point is distributed every 30 degrees, a total of 12 seat bricks are embedded in a seventh ring brick, and the seventh ring brick is used in subsequent grouping and selecting points; by adopting an existing spray gun manufacturing process, the thickness of a coated refractory material is changed in stages, so that the diameter of a powder spray gun is matched with a drilling hole, the clearance between a powder spray gun body and the seat brick is controlled to be about 5 mm, the higher strength of a joint part is guaranteed, and the strength of the joint position of the seat brick and an outer brick of the spray gun is guaranteed each time; by combining the multi-point brick distribution and grouping usemethods, the operation is repeated, the service life of the original single point is doubled, and the method has important significance for ensuring the stability and long service life of the bottompowder spraying process technology.

Description

technical field [0001] The invention belongs to the technical field of steelmaking production, and in particular relates to a method for systematically improving the service life of a converter bottom spray. Background technique [0002] The powder spraying process at the bottom of the converter is a new process for smelting by spraying powder and carrier gas into the molten pool through the spray gun at the bottom of the furnace. In this process, since the powder is sprayed from the bottom, the contact area between the powder and the molten metal is significantly enlarged, and the local concentration of the powder is increased. At the same time, the injected oxygen forms a local high iron oxide, which creates good conditions for the dephosphorization reaction; the stirring of the gas The effect accelerates the mass transfer process, greatly improves the kinetic conditions of the reaction in the molten pool, and accelerates the reaction speed of the early dephosphorization. ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for systematically improving the service life of the bottom spraying process of the converter, so as to solve the problem that the technology for systematically improving the service life of the bottom spraying process in the above-mentioned background technology is still blank.

Images