Ladle gas-permeable upper nozzle pocket block and nozzle slag entrapment control method implemented by same

Abstract

The invention relates to a ladle gas-permeable upper nozzle pocket block and a nozzle slag entrapment control method implemented by the same. The ladle gas-permeable upper nozzle pocket block comprises a ladle upper nozzle pocket block body, a plurality of gas-permeable ceramic rods and a gas chamber box. The gas chamber box is positioned at the bottoms of the gas-permeable ceramic rods and is communicated with the gas-permeable ceramic rods, the multiple gas-permeable ceramic rods are annularly and uniformly arranged on the outer periphery of a runner hole to form a circle and are positioned in the upper nozzle pocket block body, the top of each gas-permeable ceramic rod extends out of the upper surface of the upper nozzle pocket block body, a plurality of slots which are used for fixing the gas-permeable ceramic rods are formed in the gas chamber box, and the bottom of each gas-permeable ceramic rod extends into the corresponding slot of the gas chamber box. The ladle gas-permeable upper nozzle pocket block and the nozzle slag entrapment control method have the advantages that argon starts to be blown into the ladle gas-permeable upper nozzle pocket block from a gas inlet pipe when molten steel in a ladle is positioned at a low liquid level, an annular gas curtain barrier is formed around an upper nozzle of the ladle, accordingly, molten steel which is about to flow into the upper nozzle can be subjected to gaseous washing, vortex slag entrapment of the upper nozzle of the ladle can be controlled and prevented, the cleanliness of the molten steel can be improved, and the quantity of residual injection molten steel in the ladle can be reduced and is comparably reduced by 30% at least.

Description

technical field [0001] The invention relates to a ladle breathable upper nozzle seat brick and a method for controlling nozzle slag entrainment, and belongs to the technical field of steelmaking technology in iron and steel metallurgy. Background technique [0002] In the production of continuous casting machine, as the liquid level of molten steel in the ladle decreases, the molten steel is prone to eddy current at the upper nozzle of the ladle, so that the slag on the surface of the molten steel is involved and enters the tundish of the continuous casting machine, resulting in increased inclusions, Cause quality defects of slab. At present, the ladle slag detection technology is usually used to reduce the amount of ladle slag detection. The main methods of ladle slag detection are: the method of detecting ladle slag based on the principle of infrared, the method of detecting ladle slag based on the electromagnetic coil and the method of detecting ladle slag based on the pr...

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

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