Leak-proof steel structure and leak-proof steel process of steelmaking converter bottom

Abstract

The invention provides a leak-proof steel structure and a leak-proof steel process of a steelmaking converter bottom. The leak-proof steel process of the steelmaking converter bottom comprises the following steps that chromium corundum ramming mixes are poured at joint inner walls of a converter bottom working layer and a blank pressing part working layer after a converter molten pool is built, and a circular ring beam structure is formed and natural curing is carried out for 48 hours; a coke furnace is hung, then slag materials of cokes which are burnt are attached on the inner surface of a magnesium carbon brick working layer to form a coke slag material layer, and molten iron permeates the coke slag material layer to enter into the circular ring beam structure when a converter starts to smelt first furnace steels, so that the coke slag material layer and the circular ring beam structure are firmly combined with the magnesium carbon brick working layer of the converter to form a whole body to fully seal connecting parts of the converter bottom working layer and a converter body working layer. According to the invention, the circular ring beam structure, a slag material layer and a furnace lining magnesia carbon brick are combined into a whole through the molten steel, thereby sealing steel-leaking channels of blank pressing parts completely to avoid molten steel penetration, steel clamping phenomena and steel leakage accidents.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a leakage-proof steel structure at the bottom of a steelmaking converter and a process for treating the leakage-proof steel at the furnace bottom. Background technique [0002] The lining structure of the top-bottom compound oxygen blowing converter is composed of refractory materials, which are divided into permanent layer and working layer. Among them: the permanent layer lining bricks are mostly made of fired magnesia bricks, which have good physical and chemical properties and impact and erosion resistance, and have good heat insulation. The lining bricks of the working layer are mostly made of magnesia carbon bricks, which can withstand high temperature and severe temperature fluctuations, and have good resistance to chemical erosion of slag and mechanical impact and wear resistance of molten steel. [0003] However, due to the design defects of the lining structure...

AI Technical Summary

Problems solved by technology

The main reason is that the blanking part of the melting pool area has been subjected to strong erosion of molten steel during the smelting process. In the middle and late stages of the converter furnace, the lining of the blanking bricks is gradually thinned, and the magnesia carbon bricks in the bottom of the furnace and the working layer of the molten pool are more damaged. Severe, especially concentrated on the 1-2 layer of working layer bricks on the upper part of the edge-binder bricks in the molten pool. The step-back area is easily washed away by scrap steel and molten steel during the furnace opening stage, and it cannot be well pressed against the working layer bricks at the bottom of the furnace. Due to the mechanical stabilization effect, during the furnace shaking process, the working layer of the furnace bottom is loose, and gaps are formed in the blank holder, which is very prone to molten steel penetration, steel clamping, and steel leakage accidents

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