Ladle breathable upper nozzle seat brick and method for controlling nozzle slag entrainment

Abstract

The invention relates to a ladle ventilating upper nozzle seat brick and a method for controlling nozzle slag volume, which comprises a ladle upper nozzle seat brick body, a ventilating ceramic rod and an air chamber box, the air chamber box is located at the bottom of the ventilating ceramic rod and connected with the ventilating ceramic rod Connected, there are a plurality of breathable ceramic rods, which are evenly arranged in the body of the upper nozzle block in a ring around the flow steel hole. The top of each breathable ceramic rod protrudes from the upper surface of the upper nozzle block body. A plurality of slots for fixing the air-permeable ceramic rods are provided, and the bottom end of each air-permeable ceramic rod extends into the slot of the air intake chamber box. When the molten steel in the ladle is at a low level, argon gas is blown in from the inlet pipe to form a ring-shaped air curtain barrier around the upper nozzle of the ladle to wash the molten steel that is about to enter the upper nozzle. The problem of eddy current slag entrainment at the nozzle not only improves the cleanliness of molten steel, but also reduces the amount of molten steel in the ladle injection surplus, a year-on-year decrease of more than 30%.

Description

Technical field [0001] The invention relates to a ladle air-permeable upper nozzle seat brick and a method for controlling slag entrapment at the nozzle, and belongs to the technical field of steelmaking in iron and steel metallurgy. Background technique [0002] In the production of the continuous caster, as the level of the molten steel in the ladle decreases, the molten steel is prone to eddy currents at the nozzle of the ladle, so that the slag on the surface of the molten steel is caught in and enters the tundish of the continuous caster, resulting in increased inclusions. Initiate slab quality defects. At present, the ladle slag detection technology is usually used to reduce the amount of slag under the ladle. The main methods for detecting the slag under the ladle are: the method of detecting the slag of the ladle based on the infrared principle, the method of detecting the slag of the ladle based on the electromagnetic coil and the method of detecting the slag based on th...

AI Technical Summary

Problems solved by technology

However, in the actual production process, the following problems are found: (1) The ladle has a large amount of injection, which increases the consumption and cost of steel materials; Solve the technical problem of eddy current slag entrainment in the upper nozzle of the ladle; (3) Although it can reduce the amount of slag under the ladle to a certain extent, it does not have the function of removing inclusions in molten steel and purifying molten steel

This patent has the following deficiencies: there is no ventilation element in the nozzle seat brick, there is no function of removing inclusions and purifying molten steel, and it cannot suppress the problem of slag rolling at the nozzle of the molten steel tank, and the amount of molten steel in the ladle is too much

This patent has the following disadvantages: the upper part of the breathable ceramic rod (2) is flush with the refractory body (1), the production and positioning of the breathable ceramic rod is difficult, and the product yield is low; The service life of the tapping nozzle and the nozzle block is low, which affects the life of the ladle and the consumption of refractory materials

Images