Ramming material for blast-furnace tapping channel and preparation method thereof

Abstract

The invention relates to a ramming material for a blast-furnace tapping channel and a preparation method thereof. The preparation method comprises the following steps of: mixing 0 to 25 percent of brown aluminum oxide by weight, 45 to 70 percent of aluminum silicate material by weight, 5 to 15 percent of silicon carbide by weight, 3 to 5 percent of high-temperature asphalt by weight, 3 to 6 percent of Si powder by weight, 2 to 4 percent of alumina micropowder by weight and 1 to 10 percent of titanium-containing blast-furnace slag, adding 4 to 7 percent of thermosetting phenolic resin in mixture by weight, mixing and grinding for 5 to 10min, evenly stirring, and packaging for later use. The ramming material has the advantages of easily-obtained material, low cost, baking avoidance, convenient construction, high tapping efficiency and comprehensively-utilized titanium-containing blast-furnace slag; and the ramming material solves the problems of serious adherent slag and poor oxidation resistance in the tapping process of the tapping channel at the same time of obtaining better high-temperature strength, ensures that the service life is prolonged by 30 to 50 percent, and is particularly suitable for the tapping channel of the blast furnace for melting vanadium titano-magnetite.

Description

technical field [0001] The invention belongs to the technical field of refractory ramming materials. In particular, it relates to a ramming material for a blast furnace tapping channel and a preparation method thereof. Background technique [0002] Blast furnace iron trough is the channel through which high-temperature molten iron or slag flows repeatedly from the blast furnace furnace. It is mainly composed of main iron trough, branch iron trough, slag ditch and slag skimmer. The durability of materials directly affects the normal production of blast furnace ironmaking , so it is one of the most important links in ironmaking production. [0003] The melting temperature of the titanium-containing blast furnace slag formed during the smelting process of vanadium-titanium magnetite is high, generally 1380-1450 °C in the possible alkaline range, which is about 100 °C higher than ordinary blast furnace slag, and the viscosity is very high at high temperature Low, generally onl...

AI Technical Summary

Problems solved by technology

During the tapping process, the viscosity of titanium-containing blast furnace slag increases rapidly with the decrease of temperature, and it is easy to adhere to the refractory material after the temperature drops; Al in the refractory material 2 o 3 Dissolving in the slag will cause the viscosity of the slag to increase, and the flow rate will slow down to make the slag easy to adhere; in addition, the slag reacts with the refractory material to form a high-melting point mineral phase, which makes it difficult to re-dissolve the adhered slag, and the more it is on the iron trench. Therefore, the workload of cleaning slag in front of the furnace is very large; at the same time, improper slag cleaning operation shortens the life of the iron channel material, resulting in low iron flow, repeated trench repairs, and high labor intensity for workers.

[0004] In view of the above problems, the iron trench ramming material used for smelting vanadium-titanium magnetite is usually composed of brown corundum, silicon carbide, high-temperature pitch, Si powder and binder phenolic resin, etc., and a small amount of boron-containing additives are added on this basis. Additives form a phase with a relatively low melting point at the contact interface between refractories and slag-iron, which is beneficial to solve the problem of slag sticking in iron trenches, but the cost is high

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