Iron outlet of oxygen-enriched shaft furnace

Abstract

The invention relates to an iron outlet of an oxygen-enriched shaft furnace. The iron outlet is a casting body produced by a refractory material castable; and a iron flowing hole is formed, and comprises an inner top surface, an inner bottom surface and a side surface. The iron outlet is characterized in that the refractory material castable consists of a first upper refractory layer, a second upper refractory layer and a lower refractory layer; the first upper refractory layer is positioned at the upper part of the inner top surface of the iron flowing hole, and is a nitrided silicon nitride castable; the second upper refractory layer is a silicon carbide castable, and is positioned on the first upper refractory layer; the lower refractory layer is positioned below the inner bottom surface of the iron outlet, and is a castable of a mixture of silicon carbide and aluminium oxide; the first upper refractory layer downwards extends on the side surface of the iron flowing hole; the lower refractory layer extends on the side surface of the iron flowing hole, and is contacted with the first upper refractory layer to form a lower interface surface; and the lower interface surface is higher than the lower bottom surface by 45-70 cm. The iron outlet of the oxygen-enriched shaft furnace is longer in service life.

Description

technical field [0001] The invention relates to an oxygen-enriched shaft furnace taphole. Background technique [0002] The oxygen-enriched shaft furnace is designed with two iron ports, one for use and the other for standby, and the slag and iron flow out at the same time. The furnace grade is low, resulting in more than 600kg of slag output per ton of iron, and the slag and iron flow out from the same outlet. The iron gate is subject to double erosion of iron and slag, as well as internal and external oxidation and reduction, and the service life of the iron gate is short. Become a bottleneck affecting the continuous production of the oxygen-enriched shaft furnace. [0003] The service life of the taphole is generally only about 3-5 days, and the taphole can be poured up to 10 times in one furnace operation (about 50 days), which seriously affects the continuity and stability of the shaft furnace production. At the same time, it increases the risk of starting the furnace...

AI Technical Summary

Problems solved by technology

The furnace grade is low, resulting in more than 600kg of slag output per ton of iron, and the slag and iron flow out from the same outlet. The iron gate is subject to double erosion of iron and slag, as well as internal and external oxidation and reduction, and the service life of the iron gate is short. Become a bottleneck affecting the continuous production of the oxygen-enriched shaft furnace

[0003] The service life of the taphole is generally only about 3-5 days, and the taphole can be poured up to 10 times in one furnace operation (about 50 days), which seriously affects the continuity and stability of the shaft furnace production

At the same time, it increases the risk of starting the furnace and the production cost of the shaft furnace. About 160 tons of heavy steel are needed for one furnace start-up, and the cost of one additional furnace start-up will increase by more than 400,000 yuan.

In addition, the frequent shutdown of the furnace also increases the failure rate of equipment, high operating costs, poor safety and stability

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