Method of Baking Newly Laid Ladle with Waste Heat of Steel Slag

Abstract

The invention discloses a method of applying steel slag waste heat to bake a new-built ladle. The method comprises the steps that liquid state steel slag of a converter is splashed in the middle of a slag pond in a hot splashing way, and a certain amount of solidified red hot state steel slag after hot splashing is selected to be loaded into a slag tank; the red hot state steel slag is used for baking the ladle according to the baking curve of the ladle; the opening of the ladle is covered by a ladle cover, thermal energy is prevented from being lost, after baking for 8h, an infrared thermometry gun is used for measuring the baking temperature of a refractory matter, wherein the temperature of the refractory matter reaches 180+ / -50 DEG C, and new hot state slag is added to enter a next temperature baking phase; after baking for 16h, the baking temperature of the refractory matter in the ladle is measured to reach 300+ / -50 DEG C, the slag in the ladle is poured, the red hot state slag is added into the ladle to continue baking, the temperature is measured after 8h, if the temperature of the refractory matter in the ladle reaches 500+ / -50 DEG C, the slag in the ladle is poured, the ladle is sequentially baked to 900 DEG C by using fuel gas or fuel oil, and the ladle can be used according to a normal technology.

Description

technical field [0001] The invention relates to a method for baking a newly built ladle by using residual heat of steel slag. Background technique [0002] The outer shell of the ladle used in steelmaking is made of pressure vessel steel, and the inner wall is usually composed of permanent layer, heat insulation layer and working layer. The permanent layer is cast with magnesium-aluminum castables or aluminum-carbon castables; the insulation layer is made of lightweight magnesia bricks or silica bricks, and the working layer is refractory bricks in contact with molten iron, usually made of aluminum-carbon bricks. build. Since water is used as a binder in the process of repairing, the middle of the newly repaired ladle contains a certain amount of water; in addition, in the production process of aluminum carbon, the middle of the binder used contains a certain amount of volatile matter. Used in contact with hot molten iron, the moisture and volatile matter in the middle of ...

AI Technical Summary

Problems solved by technology

[0005] It can be seen from the above literature description that steel slag has not been applied to the baking process of ladle at present

[0006] In addition, liquid steel slag directly enters the ladle, which will have the following negative effects: 1. Erosion of refractory bricks, and slag adheres to the surface of refractory materials, making it difficult to peel off

Since the slag contains iron oxide and manganese oxide, etc., when the molten iron ladle is filled with molten iron, the iron oxide in the middle of the ladle will directly react with the molten iron, causing an accident of molten iron overflowing in the ladle

2. The refractory material in the ladle is suddenly heated, and the moisture and volatile matter in the middle of the refractory material escape in a large amount in a short period of time, resulting in the cracking and collapse of the refractory material, and the scrapping of the newly built ladle

Therefore, liquid steel slag cannot be applied to the baking of ladle

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