Refractory material used for lance for molten iron pretreatment and application thereof

Abstract

The invention discloses a refractory material used for a lance for molten iron pretreatment, and the material comprises the following components on a mass basis: 35-41% of mullite, 30-40% of andalusite, 9-12% of white corundum, 3-6% of alumina fine powder, 2-3% of silicon fine powder, 5% of binders, and 3% of steel fibers; the sum of the above components is 100%; in addition, the material also comprises other additives; other additives comprise 0.14% of water reducers, 0.1% of explosion-proof materials, and 0.2% of dispersants. Compared with the prior art, the lance for molten iron pretreatment of the invention has the following beneficial effect and obvious characteristics: a) the refractory material has quite good mutual adaptability with steel tubes from room temperature to 1500 DEG C; b) the refractory material has good thermal stability, erosion resistance against molten iron, and high strength and volume stability from room temperature to 1500 DEG C; c) steel tubes have quite high service strength from room temperature to 1500 DEG C.

Description

technical field [0001] The invention relates to a refractory material, in particular to a refractory material used in a molten iron pretreatment spray gun. Background technique [0002] The spray gun is made by pouring a layer of refractory material on the outer wall of the steel pipe. When in use, insert the spray gun into the molten iron, and then spray desulfurization, phosphorus, silicon and other powders into the molten iron through the steel pipe. It is mainly used in the pretreatment process of molten iron. As a bridge connecting steelmaking and blast furnace, hot metal pretreatment is an important technological means to improve the quality of steel products, expand steel varieties, reduce costs, and optimize the steelmaking process. Desulfurization, phosphorus, and silicon are very important tasks for hot metal pretreatment. The spray gun has become an important part of the molten iron pretreatment equipment, and various iron and steel industries at home and abroad h...

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Problems solved by technology

[0003] The characteristics of the spray gun used by the existing torpedo tank molten iron truck are that the steel pipe is as small as the outer diameter of Φ60.5cm, the thickness is 5mm, and the length is about 4.5m. The thickness of the gun wall is about 1.5cm to 3cm. When the injection operation is carried out at 1380°C±50°C, the spray gun enters and exits the torpedo tank with the injection, expands at high temperature and contracts at low temperature, and the asynchronous volume change caused by the difference in material properties between refractory materials (inorganic materials) and steel pipes (metal materials) will lead to The peeling of the refractory material makes the spray gun very easy to damage, so that the service life of the spray gun is not high, and the service life of the spray gun affects the time of the entire steelmaking process, which is very important to reduce the cost of steel per ton. Key objectives for R&D and improvement

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