Maintenance method of converter bottom of top-bottom combined blowing converter

Abstract

The invention provides a maintenance method of a converter bottom of a top-bottom combined blowing converter. Low-pressure and low-flow nitrogen are blown into the converter through an oxygen lance, and heat of converter gas in the converter is timely replaced and discharged, so that a small amount of converter slag left in the converter is rapidly cooled so as to be chilled, solidified and adhered to the converter bottom; and after steel scraps or iron blocks are added, the heat of the converter slag and the added steel scraps or iron blocks are further subjected to heat exchange, so that thecooling and solidification of the converter slag are accelerated, therefore the converter bottom is rapidly patched with the slag, and the purpose of maintaining the converter bottom is achieved; themaintenance method does not need modification of equipment and process, and is simple and practical in steps and low in cost, on the premise of ensuring operation safety and maintenance effect, the cost investment of refractory materials such as converter fettling materials is not needed, and adverse effects on converter fettling and molten steel pollution problems caused by too long or too shortsintering time no longer exist; and the maintenance method has the characteristics of being fast in maintenance speed, good in fettling effect, little in influence on the molten steel quality, low inmaintenance cost, simple, practical, safe and environmental-friendly, and the like.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, in particular to a method for maintaining the furnace bottom of a top-bottom combined blowing converter. Background technique [0002] During the blowing process of the converter, extremely complex and intense physical and chemical reactions and mechanical movements are going on in the furnace. Due to various reasons such as mechanical erosion, high temperature, chemical erosion, peeling, etc., it is easy to cause damage and accelerated erosion of the converter lining. [0003] Due to the oxidation of the bottom blowing components, the long time of contact with high temperature molten steel, and the large temperature difference, the corrosion rate of the top and bottom combined blowing converter is relatively fast. The erosion of the furnace lining is more serious, resulting in accelerated erosion of the refractory material at the bottom of the furnace and a decrease in the height ...

AI Technical Summary

Problems solved by technology

This maintenance method must be operated when the converter is empty, and at the same time, sufficient sintering time must be ensured, which not only consumes a large amount of repair materials or magnesia carbon bricks, but also has the disadvantage of poor sintering and solidification effect of repair materials. Potential safety hazards and the fall-off of repair materials affect the quality of molten steel

In the above-mentioned traditional furnace bottom maintenance method, the quality of repairing materials or magnesia carbon bricks directly affects the maintenance effect of the furnace bottom. At the same time, the sintering time is not enough, which will easily cause the repairing materials to peel off and pollute the molten steel, and there are great safety hazards. At the same time, there are more or less partial corrosion and peeling of the repair charge, which enters the molten steel and affects the quality of the molten steel.