Filling fire clay for assembling tundish upper water gate iron shell and preparation method thereof

Abstract

The invention discloses filling fire clay for assembling a tundish upper water gate iron shell. The filling fire clay comprises the following components: 3-7% of brown fused alumina, 3-7% of 85 alumina, 65-75% of quartz, 3-7% of kyanite, 3-7% of a ceramic plastic adhesive, 2-5% of Suzhou clay, 1-3% of spinel, 1-2% of potassium feldspar, 0.1-0.3% of methylcellulose, 2-5% of 92 magnesia, 0.2-0.5% ofsodium alginate, 0.3-0.7% of starch and 12-18% of alumina sol. The invention aims to provide the filling fire clay for assembling the tundish upper water gate iron shell of an anti-seepage steel structure, wherein the service life of tundish refractory materials is prolonged, and the steel seepage problem is fundamentally solved under a high continuous casting condition.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic refractory materials, and more particularly relates to a filling fire mud for assembling a tundish upper nozzle iron shell and a preparation method thereof. Background technique [0002] Continuous casting is the main process of iron and steel metallurgy production at present. The tundish is the most important equipment in the continuous casting process. During the whole pouring process, the tundish is in a fixed state, and the molten steel is received from the ladle, and then combined with the stopper rod and the runner. The formed valve injects molten steel into the mold according to the set drawing speed. The stopper rod and the upper nozzle, the key components for controlling the flow rate, are in contact with molten steel with a temperature of over 1500 degrees Celsius for a long time, so the quality of the two products must be guaranteed. In particular, the upper nozzle placed at the b...

AI Technical Summary

Problems solved by technology

[0003] Usually in some steel mills, in the process of using the upper nozzle of the tundish, there will often be steel seepage in the gap between the upper nozzle and the block, which will affect the normal production of the steel factory

In view of this situation that often occurs, we conducted an analysis between the upper nozzle, the seat brick, and the fire clay. We believe that the reason for this is that there are fine cracks caused by the dry shrinkage of the fire clay during baking and use. In the steel pouring process, due to the pressure of the stopper rod and the molten steel, the high temperature molten steel gradually penetrates from the fine cracks in the cement. As time goes on, the molten steel finally seeps into the mechanism, which will seriously damage the mechanism, and even more equipment accidents, and even personal safety accidents

For the conventionally manufactured upper nozzle, the surface of the inclined surface is smooth, and the inner wall of the seat brick is also smooth, and the fire clay is filled in the middle. Under the action of temperature and external force, penetrating micro cracks of the fire clay are caused, resulting in steel penetration.

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