KR100489195B1 - Recycling Method of Residual Castables for Teeming Ladle - Google Patents

Abstract

An object of the present invention is to recycle the remaining influent and to reduce the construction time of the new influent.

Therefore, the present invention forms a slag coating layer on the surface of the residual inflow material having a thickness of about 50 mm using a ladle slag generated after the molten steel is removed to a thickness of 5 to 15 mm, and then cooled to room temperature. The new influent material is constructed with a thickness of 50 to 70 mm, and a residual inflow material addition method is provided, characterized in that preheating is performed at 1000 ° C to 1200 ° C under normal conditions.

Description

Recycling Method of Residual Castables for Teeming Ladle}

The present invention relates to a method of recycling residual influent for ladle, and more particularly, adding a residual influent for coating a ladle slag on the surface of the remaining influent and constructing a new influent. It is about a construction method.

In general, the inflow material for ladle is generated as a residual inflow material more than 50mm after use, in the prior art was mainly discarded by using a breaker (breaker).

In addition, in the method for repairing the internal refractories of a molten metal container with slag as in Japanese Patent Application Laid-Open No. JP9280746, after applying a slag modifier to reduce the melting point of the attached slag on the surface of the internal refractories in advance A repairing method for a built-in refractory metal container containing molten refractory materials has been disclosed.

However, the method of discarding the total amount of residual influent generated after use has the disadvantage of increasing the amount of waste generated and the amount of new influent input, and methods such as Japanese Patent Application Laid-Open No. JP9280746 require not only reforming but also reforming. Since it takes time to apply the ash has the disadvantages of unit cost rise and construction time increase.

Accordingly, the present invention has been made to overcome the above disadvantages, to recycle the remaining influent and to reduce the construction time of the new influent, using the ladle slag generated after the molten steel excretion through After the slag coating layer is formed on the surface of 5 ~ 15mm thickness, it is cooled to room temperature, and the new inflow material is constructed to a thickness of 50 ~ 70mm and the residual inflow material is added, which is preheated to 1000 ℃ ~ 1200 ℃ under normal conditions. The purpose is to provide a construction method.

Residual inlet material addition method of the present invention for achieving the object as described above, the step of coating the slag on the surface of the residual inlet material of the ladle after the molten steel removal operation, the step of cooling the slag coated ladle to room temperature, And constructing a new inflow material into the slag coating layer inside the ladle.

The slag coating is made through the furnace sloping, and the slag coating layer is formed on the surface of the remaining inflow material to a thickness of 5 to 15 mm, then cooled to room temperature, and the new inflow material is constructed to a thickness of 50 to 70 mm, and the general conditions are 1000 ℃ ~ It is preheated at 1200 ℃ and installed

In the present invention, the composition of the inflow material and ladle slag is not particularly limited, and an ordinary inflow material for ladle and ladle slag may be used.

In the present invention, the thickness of the slag coating layer formed on the surface of the residual inflow material should be 5 ~ 15mm. When the thickness of the slag coating layer is less than 5mm, the adhesive interface between the remaining inflow material and the new inflow material is weak, and the new inflow material is now infiltrated through the contact surface between the remaining inflow material and the new inflow material. When the thickness of the slag coating layer is 15 mm or more, the fire resistance of the adhesive layer formed on the interface between the remaining inflow material and the new inflow material is low, resulting in a sharp drop in the resistance when the interface is exposed to molten steel.

In the present invention, the construction thickness of the new inflow material should be 50 ~ 70mm. If the construction thickness is less than 50mm, the contents are degraded due to the increase in the thickness of the deteriorated layer of the new inflow material by the slag coating layer, and if it is more than 70mm, the adhesion interface between the remaining inflow material and the new inflow material decreases due to weak heat transfer during preheating. The current penetrates into the interface between the influent and the new inlet, resulting in the dropping of the new inlet.

In the present invention, there is no particular limitation to the preheating condition, and it is sufficient that 1200 ° C to 1200 ° C, which is a preheating condition commonly used to prevent the occurrence of thermal spalling during molten steel, is sufficient.

Hereinafter, the present invention will be described in detail through examples.

Example Comparative example One 2 One 2 3 4 Thickness of slag coating layer (mm) 5 15 2 20 10 5 Construction thickness of new incoming materials (mm) 50 70 70 50 40 80 Residual thickness of new influent after use of 120ch (mm) 10 15 none none none none Now penetrates the interface between remaining influent and new influent after 60ch none none Occur none none Occur

After using 260ch, the ladle of 300 ton capacity with average thickness of 50mm is tilted 15 times immediately after molten steel to make the thickness of slag coating layer formed on residual inflow material to be 5 ~ 15mm. Here, ch is an abbreviation for charge, and is defined as a unit which means one step of processing a desired process after lapping the waste water in a ladle, and then transferring to the next process.

After the cooling of the ladle was completed, a conventional alumina-magnesia inflow material was applied to a thickness of 50 to 70 mm, preheated to 1100 ° C., used up to 120 ch, and then Examples 1 to 2 were obtained.

Moreover, Comparative Examples 1-4 were obtained in the range outside the Example. Ladle slag generated after molten steel is used to form a slag coating layer on the surface of the remaining influent material by 5 to 15mm thickness through furnace sloping and then cooled to room temperature, and the new inflow material is constructed to a thickness of 50 ~ 70mm. Examples 1 to 2 preheated to 1000 ℃ ~ 1200 ℃ condition was achieved the object of the present invention, Comparative Examples 1 to 4 out of the scope of the present invention is the fall of the content of the new inlet material and dropping out due to the current penetration Occurred.

According to the method of adding the residual inflow material according to the present invention as described above, the remaining inflow material is recycled, thereby not only contributing to the reduction of waste, but also by improving the adhesive interface between the remaining inflow material and the new inflow material by simple work by rolling the furnace. And it is possible to obtain the effect of shortening the construction time.

Claims (3)

Tilting the ladle after molten steel to coat the slag in the ladle on the remaining inlet surface remaining in the ladle; Cooling the slag-coated ladle at room temperature; Constructing a new inflow material into the slag coating layer inside the ladle Residual influent addition construction method comprising a. The method of claim 1, wherein the slag coating layer has a thickness of 5 to 15 mm. The method according to claim 1, wherein the new inflow material has a thickness of 50 to 70 mm and is preheated to 1000 ° C to 1200 ° C.