KR100515600B1 - 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 comprises the steps of mixing the siliceous raw material in the ladle after the molten steel removal operation, coating the mixture of the slag and the siliceous raw material on the surface of the residual inlet material of the ladle, cooling the slag coated ladle to room temperature It provides an additional construction method of the remaining inlet material using the slag comprising the step, the new input material in the slag coating layer inside the ladle.

Description

Recycling Method of Residual Castables for Teeming Ladle}

The present invention relates to a method for recycling the residual inflow material for ladle, and more particularly, by mixing the siliceous raw material in the ladle slag (slag) to modify the slag with a low base, and then coating the surface of the remaining inflow material ( The present invention relates to a method for adding residual influent materials by using slag to coat new influent materials.

In general, the inflow material for ladle is generated as a residual inflow material having a thickness of 50 mm or more after use. In the past, the entire amount of the inlay material is discarded using a breaker, or the slag-attached molten metal container as in JP9280746. In the method for repairing the interior refractories, there is a method for repairing the interior metal refractory of a molten metal container, wherein a slag modifier for lowering the melting point of the adhered slag is applied to the surface of the interior refractories in advance and then an amorphous refractory is constructed.

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 was devised to solve the above disadvantages, and 50: 1 by weight of ladle slag and siliceous raw material generated after molten steel removal in order to recycle the remaining influent and to shorten the construction time of the new influent. After mixing so that it becomes ~ 100: 1, the slag coating layer is formed on the surface of the residual inflow material by 3-10mm thickness through the furnace sloping, cooled to room temperature, and the new inflow material is constructed to a thickness of 50-70mm and It is an object of the present invention to provide a method for adding a residual inflow material using slag, which is preheated to 1000 ° C to 1200 ° C.

Residual inflow material addition construction method using the slag of the present invention for achieving the object as described above, the step of mixing the siliceous raw material in the ladle after the molten steel excavation, and the mixture of the slag and the siliceous raw material Coating the remaining inlet material surface, cooling the slag coated ladle to room temperature, and constructing a new inlet material in the slag coating layer inside the ladle.

Here, the coating of the mixture of slag and siliceous raw material is made through the stirring of the furnace body, and after mixing the ladle slag and the siliceous raw material generated after the molten steel to be 50: 1 ~ 100: 1 in weight ratio, After forming the slag coating layer on the surface of the residual inlet material 3 ~ 10mm thick, and cooled to room temperature, the new inlet material is constructed to a thickness of 50 ~ 70mm and preheated to 1000 ℃ ~ 1200 ℃ the normal conditions to complete.

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 addition, the siliceous raw material mixed with the ladle slag is not particularly limited, but the purity is 90% or more and the average particle size is preferably 10 mm.

In the present invention, the siliceous raw material mixed with the ladle slag should be 50: 1 to 100: 1 by weight ratio of ladle slag and silica. When the mixing ratio is 50: 1 or less, the viscosity of the slag coating agent is lowered to increase the fluidity, which causes a problem in that it is difficult to form the slag coating layer on the surface of the remaining inflow material. When the mixing ratio is more than 100: 1, the adhesion interface of the remaining inflow material and the new inflow material decreases in the area where the thickness of the slag coating layer is 10 mm or less, and now it penetrates into the adhesive surface when used, causing turbidity of the new inflow material. Even if it is 10 mm or more, the fire resistance of the adhesive layer formed at the interface between the remaining inflow material and the new inflow material is low, resulting in a rapid decrease in the contents when the interface is exposed to molten steel.

In the present invention, the thickness of the slag coating layer formed on the surface of the residual inflow material should be 3 ~ 10mm. When the thickness of the slag coating layer is less than 3mm, 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 more than 10mm, the fire resistance of the adhesive layer formed on the interface between the remaining inflow material and the new inflow material is weak, resulting in a sharp decrease in the contents 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 3 4 One 2 3 4 5 6 Mixing ratio of slag and silica (weight ratio) 50: 1 100: 1 70: 1 80: 1 40: 1 110: 1 50: 1 100: 1 70: 1 80: 1 Thickness of slag coating layer (mm) 7 9 3 10 - 3 12 One 3 10 Construction thickness of new incoming materials (mm) 50 70 60 50 - 70 70 70 80 40 Residual thickness of new influent after use of 120ch (mm) 10 9 15 10 - none none none none none Coating layer formation Good Good Good Good Difficulty Good Good Good Good Good Now penetrates the interface of remaining influent and new inlet after 60ch none none none none - Occur none Occur none none

After using 260ch, the ladle of 300 ton capacity with the average thickness of 50mm is injected into the remaining slag immediately after molten steel, and the ratio of slag and silica is 50: 1 ~ 100: 1 by weight ratio, and the ladle is tilted 15 times. The thickness of the slag coating layer formed on the residual inflow material to be 3 ~ 10mm and then the remaining slag was removed and the ladle was cooled to room temperature. After the cooling of the ladle was completed, a conventional alumina-magnesia inlet was applied to a thickness of 50 to 70 mm, preheated to 1100 ° C., used up to 120 ch, and the following Examples 1 to 4 were obtained.

Moreover, Comparative Examples 1-6 were obtained in the range outside the Example. Ladle slag and silica produced after molten steel should be added at a ratio of 50: 1 to 100: 1, and a slag coating layer is formed on the surface of the remaining inflow material by 3-10 mm thickness through the furnace tilting, and then cooled to room temperature. Examples 1 to 4, in which ash was applied to a thickness of 50 to 70 mm and preheated to 1000 ° C. to 1200 ° C. under normal conditions, have achieved the object of the present invention, but Comparative Examples 1 to 6 are outside the scope of the present invention. Reduction of ash content and dropout due to infiltration now occurred.

As described above, the method of adding the residual inflow material using slag according to the present invention recycles the remaining inflow material, thereby not only contributing to the reduction of waste, but also enhancing the interfacial adhesion between the remaining inflow material and the new inflow material by simple work by the furnace tilting. It is possible to obtain the effect of reducing the construction cost and construction time.

Claims (5)

Mixing the siliceous raw material in the ladle after the molten steel removal operation; Coating a mixture of slag and siliceous raw material in the ladle on the surface of the remaining inlet of the ladle; Cooling the slag coated ladle to room temperature; Constructing a new inflow material into the slag coating layer in the ladle; Residual influent addition construction method using a slag comprising a. The method of claim 1, wherein the slag and the siliceous raw material are mixed in a weight ratio of 50: 1 to 100: 1. The method of claim 1, wherein the slag coating layer has a thickness of 3 to 10 mm. The method of claim 1, wherein the new inflow material has a thickness of 50 to 70 mm and is preheated to 1000 ° C to 1200 ° C. The method according to claim 1, wherein the siliceous raw material has a residual inflow material using slag, wherein the average particle size is 10 mm.