Shaping refractory material converter protection method for converter

Abstract

The invention discloses a shaping refractory material converter protection method for a converter. The method specifically comprises the following steps of: (1), selecting waste shaping refractory materials; (2), selecting slag and determining the allowance of the slag; and (3), fettling by using the shaping refractory materials. The converter protection method is simple and easy to implement; after the tapping of the converter is finished, how much of the slag to be reserved in the converter is determined according to the size of the slag and the required amount of the shaping refractory materials, the slag is quickly cooled and bonded together after a waste magnesia carbon brick or magnesite is added in, and the slag is integrated with converter lining by utilizing the temperature difference of the slag and the interface of the converter lining and through mutual diffusion among minerals, so that the fettling effect is achieved, the erosion rate of a working layer of the converter lining is slowed down, smoothness of a bottom blowing pipeline is protected, and long-acting visual operation of bottom blowing is achieved

Description

technical field [0001] The invention belongs to the technical field of iron and steel, and relates to a method for protecting a converter with shaped refractory materials. Background technique [0002] Nangang’s 150-ton converter smelting steel has a complex steel structure, a large proportion of low-carbon and low-phosphorus steel, high oxygen content in molten steel at the end of converter smelting, and strong oxidation of the final slag, which leads to a rapid decline in furnace bottom erosion. In order to maintain a certain furnace bottom thickness, In the later stage of the furnace operation, the bottom blowing flow rate and pressure were forced to be reduced, and at the same time, a padding time was applied to maintain a certain furnace bottom thickness. There are 6 air-permeable core bricks at the bottom of the converter, and each air-permeable core brick is distributed with 23 stainless steel capillaries with a diameter of 3mm. Conventional furnace repair process: us...

AI Technical Summary

Problems solved by technology

There are 6 air-permeable core bricks at the bottom of the converter, and each air-permeable core brick is distributed with 23 stainless steel capillaries with a diameter of 3mm. Conventional furnace repair process: use scrap steel bucket and manual throwing method to add furnace repair materials into the furnace and shake the furnace Body, use the waste heat of the converter to make the repair material have a certain fluidity, so that it can spread on the damaged part of the furnace lining or slag layer, and play the role of protecting the furnace lining; it takes about 50 to 60 minutes at a time, and the shutdown time is long, which restricts the continuous production of the converter; and The use cost is high, the environment is polluted, and there are potential safety hazards; it is easy to cause the repair material to block the bottom blowing capillary, which affects the ventilation effect

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