JPH05177342A - Method for removing deposition in molten metal vessel and removing burner - Google Patents

Abstract

PURPOSE:To easily and quickly remove deposition by injecting fuel and assisting gas into a molten metal vessel, burning and injecting an exothermic solid material, etc., to the deposition. CONSTITUTION:Metals 4a, 4b and steel slags 5a, 5b being the deposition in the molten metal vessel (tundish) 1 are melted and removed by using burners 7a, 7b. Then, the fuel and the assisting gas are injected into the molten metal vessel 1 from burners 7a, 7b and burnt. Together with the above, the exothermic solid material and/or oxygen gas are injected toward the deposition (steel slags 5a, 5b) from injecting pipes 8a, 8b inserted in the burners 7a, 7b to melt and remove the deposition. Then, the injecting pipe is made to freely reciprocate on the burner axis. By this method, the deposition can be removed in the case of applying to a ladle for steelmaking, converter, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a burner for removing deposits in a molten metal container. For more details,
The present invention is, for example, a continuous casting tundish, a ladle for steelmaking, a converter, and a method for removing deposits such as metal ingots and steel slag attached to molten metal containers such as vacuum degassing tanks and deposits. Regarding the removal burner.

[0002]

2. Description of the Related Art Conventionally, a technique for dissolving and removing deposits (for example, metal or steel slag) in a molten metal container such as a tundish for continuous casting, a ladle for steelmaking, a converter, and a vacuum degassing tank. For example, the technologies listed below are known.

(A) JP-A-54-4811 A burner is inserted into the vacuum degassing tank from the upper part and then ignited, and the combustion gas generated at that time maintains and heats the inside of the tank at a high temperature. This is a technique for dissolving and removing the deposits in the tank. The burner is supplied with fuel and combustion-supporting gas (air or oxygen-enriched air).

(B) Japanese Unexamined Patent Publication No. 58-185704 A long lance is moved up and down with respect to a shaft core in a molten metal processing container, and oxygen gas is jetted from the tip of the long lance to a deposited metal. Is a technique for dissolving and removing the adhered metal.

Incidentally, in this Japanese Patent Application Laid-Open No. 58-185704,
Although it is described that "fuel gas" is injected to the adhered metal, "fuel gas" in this publication is used in a very broad sense, and when ejected, it causes a combustion reaction on the adhered metal in a high temperature state. It is also clear from the description of the specification that it means "oxygen gas" as a fuel for the combustion reaction, that is, the fuel that causes the combustion reaction.

(C) Japanese Unexamined Patent Publication No. 62-127146 This is a technique for dissolving and removing deposits in a tundish for continuous casting by heating with a burner. The burner is supplied with fuel and combustion-supporting gas (air or oxygen-enriched air).

(D) Japanese Unexamined Patent Publication No. 1-107948 and No. 1-107949 Disclosure of metal and steel slag attached to the tundish for continuous casting
This is a technique of dissolving and removing by using a burner and an exhaust consumable lance (oxygen gas pipe) for injecting oxygen gas together.

[0008]

Generally, the deposits in the molten metal container include a metal mainly composed of iron and a steel slag containing a large amount of oxides such as Ca, Al and Si. In many cases, due to the difference in specific gravity, etc., the upper part of the metal is covered with a steel slag to form a layer.

Therefore, in order to apply the above-mentioned conventional technique to the removal of the deposits in the molten metal container, for example, the technique shown in (b) above is applied to the metal in a high temperature state. It is sufficient to inject a gas to dissolve and remove the metal by using the heat of oxidation reaction, but for a metal that is not in a high temperature state and a steel slag containing a large amount of oxides such as Ca, Al, and Si, it is simply oxygen gas. Since it is difficult to dissolve and remove it by only injecting, there is no rapid progress of oxidation reaction.For example, as in the technologies shown in (a) and (c) above, an oxygen-enriched burner or the like is used together to deposit It was necessary to heat up to the melting temperature or higher to dissolve and remove.

In other words, the technique shown in (b) above is a method of removing metal by simply injecting only oxygen gas and utilizing the heat of oxidation reaction of metal. In this technique, the deposits mainly consist of iron. In addition, since the ingots and the high temperature of the ingot are essential conditions, the ingot is not mainly composed of iron but is a steel slag containing a large amount of oxides such as Ca, Al and Si. In some cases or when the metal is not in a high temperature state, there is a problem that it is not easy to remove these deposits. That is, the technique shown in (b) above is insufficient from the viewpoint of easily and quickly removing the deposit.

On the other hand, as in the techniques shown in (a) and (c) above, the technique for dissolving and removing the deposits by using an oxygen-enriched burner in combination often uses oxides such as Ca, Al, and Si. Since the melting point of the contained steel slag is as high as around 1700 ° C, it takes a relatively long time to raise the temperature, and there is a problem that the deposits cannot be removed quickly.

Further, in the technique described in (d) above, since the deposits are removed by using the burner and the consumable lance for opening for injecting oxygen together, both the apparatus and the work for removing the deposits are complicated. In reality, there was a problem that it was not easy to implement. In particular, in Table 1 of JP-A-1-107949, it is shown in the Examples that the residual steel weight of 10 kg and the residual steel slag of 20 kg remained in the tundish even after heating and melting. It is described that it was used to prevent the ingot and steel slag from flowing into the nozzle at the start of the next continuous casting. As described above, this technique is not perfect for removing deposits, and there is a problem in that it requires the use of a start pipe.

The object of the present invention is to solve the above-mentioned problems in the prior art and to include a large amount of deposits in the molten metal container, that is, a metal mainly containing iron and oxides such as Ca, Al and Si. It is an object of the present invention to provide a method for removing deposits in a molten metal container and a burner for removing deposits, which are capable of easily and quickly melting and removing both the steel slags to be removed.

[0014]

SUMMARY OF THE INVENTION Here, the gist of the present invention is a method of dissolving and removing the deposits in a molten metal container by using a burner. (I) Fuel and combustion support from the burner A molten metal which is burned by injecting an oxidizing gas into the molten metal container, and (ii) the exothermic solid substance and / or oxygen gas is injected to the deposit to dissolve and remove the deposit. This is a method of removing deposits in the container.

In the above-mentioned present invention, the exothermic solid substance means a substance which dissolves and removes the deposit by causing an oxidative exothermic reaction on the surface of the deposit in the molten metal container which is being heated. For example, Fe powder and Al powder can be exemplified. From another aspect, the present invention is provided with a fuel injection hole, a combustion-supporting gas injection hole, and an injection pipe for injecting an exothermic solid substance and / or oxygen gas into a molten metal container. It is a burner for removing adhered substances. In the burner for removing deposits in the molten metal container according to the present invention described above, it is desirable that the injection pipe is reciprocally provided on the burner shaft center in order to protect the injection pipe.

[0016]

The operation of the present invention will be described in detail below. In the present invention, as in the prior art shown in (a) and (c) above, in order to burn the deposits in the molten metal container, the burner injects fuel and combustion-supporting gas. As a result, the inside of the molten metal becomes hot, regardless of whether the deposit is hot at the start of metal removal or whether it is a slag containing a large amount of oxides such as Ca, Al and Si. It is possible to dissolve and remove the attached matter.

However, if the burning is simply performed in this manner, the melting and removal of the steel slag takes a long time because it has a high melting point of about 1700 ° C. Therefore, in the present invention, the exothermic solid substance and / or oxygen gas is further jetted toward the deposit to cause an oxidative exothermic reaction on the surface of the deposit to heat the deposit.

Therefore, the combustion of the deposit is promoted, and the deposit is heated to the melting point in a short time. In this way, it is possible to easily and quickly heat and melt and remove both the base metal and the steel slag in the molten metal container. The exothermic solid substance and / or oxygen gas may be sprayed onto the deposit. That is, in the usual case, it is desirable that the heating can be performed in a short time by injecting the exothermic solid substance, but depending on the temperature of the adhered matter, even if only the oxygen gas is injected, the adhered matter will melt in a short time. Because it is heated sufficiently.

As described above, in order to supply the fuel, the combustion-supporting gas, the exothermic solid substance and / or the oxygen gas into the molten metal container, for example, the fuel injection hole, the combustion-supporting gas injection hole and the exothermic property are provided. An example is a burner having an injection pipe for injecting a solid substance and / or oxygen gas, and a device for removing deposits in a molten metal container provided with a device for supplying the exothermic solid substance and / or oxygen gas to the burner. To be done.

The fuel injection holes, the combustion-supporting gas injection holes and the injection pipes provided in the burner are not limited in any manner. Further, the structures of the fuel injection hole, the fuel supply system, the combustion-supporting gas injection hole, and the combustion-supporting gas supply system are not limited at all, and known ones may be used. Further, the structure of the injection pipe is not particularly limited as long as it is a structure capable of supplying the exothermic solid substance and / or oxygen gas. In the burner for removing deposits in the molten metal container according to the present invention, the injection pipe is reciprocally provided on the axis of the burner to protect the injection pipe when not in use. Desirable for.

The present invention will be described in detail with reference to the accompanying drawings. 1, FIG. 2 and FIG. 3 are explanatory views for explaining an embodiment of the present invention, and FIG. 1 is a plan view showing a state when the tundish is tilted by 90 ° and heating by the burners 7a, 7b is started. 2 is a vertical cross section A- in FIG.
FIG. 3 is an explanatory view showing A ′ and FIG. 3 is a vertical sectional view taken along the line BB ′ in FIG. 1.

Reference numeral 1 is a tundish, reference numerals 2a and 2b are nozzles, reference numerals 3a, 3b and 3c are tundish lids,
Reference numerals 4a and 4b are ingots mainly composed of iron, and reference numerals 5a and
5b is a steel slag containing a large amount of oxides such as Ca, Al and Si.

In order to dissolve and remove the deposits in the tundish according to the present invention, for example, as shown in FIG. 1, the tundish 1 tilted as shown in FIG. 1 is provided with burners from the respective openings 6a and 6b of the tundish lids 3a and 3c. 7a, 7b facing, burner 7a, 7b
Fuel and combustion-supporting gas to be burned in the tundish, and exothermic solid substance and / or oxygen gas are injected into the burners 7a and 7b from the injection pipes 8a and 8b, respectively.
By injecting toward the 5a and 5b, the metal and steel slag are dissolved and removed, and through the discharge holes 9a and 9b provided on the upper side surface of the tundish 1, the recovery container 11a arranged in the pit 10
, 11b, respectively. The hot exhaust gas generated by combustion is the molten metal injection hole provided in the tundish lid 3b.
It is discharged from the tundish 1 through the exhaust gas pipe 13 fitted by using 12. Reference numerals 14a and 14b are carts and reference numerals.
15a and 15b are cylinders, and the burners 7a and 7b can be brought into the tundish 1 through the openings 6a and 6b provided in the tundish lids 3a and 3c by the forward movement of the carriages 14a and 14b, respectively. It is configured to be possible.

Further, the injection pipes 8a and 8b provided in the burners 7a and 7b, respectively, can freely move within the burners 7a and 7b on their axes by the operation of the cylinders 15a and 15b, respectively. Reference numerals 16a and 16b are connecting fittings for connecting the injection pipes 8a and 8b and the cylinders 15a and 15b. Reference numeral 17 in FIG. 2 is a locking metal fitting for preventing the tundish lid 3 from falling off when the tundish 1 is tilted.

FIG. 4 schematically shows an example of the structure of the burner according to the present invention. In FIG. 1, the tundish 1 is provided with two burners 7a and 7b, but since these configurations are completely the same, in the explanation of FIG. Instead, use one instead. Therefore, a and b in the reference numerals are omitted.

In the figure, reference numeral 18 is a fuel supply pipe, reference numeral
Reference numeral 19 is a fuel flow path, reference numerals 19 and 20 are combustion-supporting gas (air or oxygen-enriched air) supply pipes, and reference numeral 19
Indicates the primary side and reference numeral 20 indicates the secondary side. The combustion-supporting gas is distributed and passes through the primary-side combustion-supporting gas flow path 22 and the secondary-side combustion-supporting gas 23 flow path, respectively, and is injected from the tip of the burner. It is designed to burn.

The injection pipe 8 for injecting the exothermic solid substance and / or the oxygen gas is internally provided at the center of the fuel flow path 21, that is, on the axis of the burner 7, and partially on the circumference of the injection pipe 8. It is fixed so as not to be displaced in the circumferential direction from the shaft center by a spacer 24 fixed to the end of the fuel passage 21. A portion of the injection pipe 8 which penetrates the end of the fuel flow passage 21 is prevented from leaking of fuel by a seal 25. I am trying to do it. 26 is a burner tile and 27 is a heat shield. A fuel injection hole is provided at the tip of the fuel supply pipe 18.
18a and the combustion-supporting gas injection hole 19a is provided at the tip of the combustion-supporting gas supply pipe 19, respectively, similarly to the known burner.

FIG. 5 is an explanatory view for explaining the burner structure of the embodiment similarly to FIG. 4, and FIG. 4 is a position in which the position of the injection pipe 8 is retracted by retreating on the burner shaft center. In contrast to the state shown in FIG. 5, FIG. 5 shows the state in which the position of the injection pipe 8 is at the position advanced on the burner shaft center.

As shown in FIG. 4, the reason for retreating the injection pipe 8 on the burner shaft center is that when the exothermic solid substance or oxygen gas need not be injected from the injection pipe 8, the fuel and the combustion-supporting gas are mixed. This is to protect the tip of the injection pipe 8 from the heat of combustion,
Further, as shown in FIG. 5, the reason for advancing the injection pipe 8 on the burner shaft core is that when the exothermic solid substance or oxygen gas is injected from the injection pipe 8, the exothermic solid substance and the air or the injection pipe ejected from the burner. The oxygen injected from the burner and the fuel injected from the burner may cause a strong oxidation reaction in the vicinity of the burner tip, and may not work effectively on the ingot or steel slag. This is because the oxidation reaction is suppressed and the oxidation reaction is surely caused in the vicinity of the deposit. The reference numerals in FIG. 5 are the same as those in FIG. Next, the operation content of the method according to the present invention will be described in detail.

In FIG. 1, the deposits on the tundish 1 are generally composed of about 1 to 5 tons of metal 4a and 4b and about 0.1 to 0.5 tons of steel slag 5a and 5b which covers and covers them. Become. Therefore, in the initial stage of heating when the deposits are dissolved and removed using the burner 7, the steel slags 5a and 5b containing a large amount of oxides such as Ca, Al and Si and having a relatively high melting temperature are first removed by dissolution. Is needed. Therefore, in the present invention,
Fuel and combustion-supporting gas are injected from the burners 7a and 7b to burn and heat in the tundish 1, and exothermic solid substances such as powders of iron and aluminum are injected into the injection pipes 8a and 8b.
From the steel slag 5a, 5b is sprayed appropriately (heating process). As a result, the heat of the oxidation reaction of the exothermic solid substance is supplied to the surface of the steel slag and the temperature of the steel slags 5a and 5b rapidly rises and easily reaches the melting temperature or higher, so that the steel slag 5 is easily and quickly dissolved and removed. can do.

Next, when the steel slag 5 is removed and the metal 4 is exposed on the surface, the burner 7 injects the fuel and the combustion-supporting gas, burns them, raises the temperature, and injects them from the injection pipe 8. By switching the substance from the exothermic solid substance to oxygen gas and appropriately injecting it toward the ingot 4, the heat of oxidation reaction between the ingot and oxygen gas is also used, and the ingot 4 can be easily manufactured at low cost. And it can be rapidly dissolved and removed.

In the above heating step, it is desirable to inject both the exothermic solid substance and the oxygen gas from the viewpoint of the effect, but the amount and components of the deposits or the speed of removal of the deposits are not sufficient. It is also possible to inject only one of the exothermic solid substance and the oxygen gas in consideration of the importance or cost.

When injecting a heat-generating solid substance or oxygen gas from the injection pipes 8a and 8b as described above, the injection pipes 8a and 8b are moved forward on the burner 7a and 7b on the respective axial cores. It can be adjusted to a position where it can be brought close to gold or the like and most effectively removes metal, etc., and if it is not necessary to inject the heat-generating solid substance or oxygen gas from the injection pipes 8a, 8b, the injection pipe 8
It is possible to move the a and 8b to the rear of the burner on the shaft cores of the burners 7a and 7b and to retreat to a position where heat is less likely to be affected.

The structure of the injection pipe 8 is, for example, a single pipe made of stainless steel pipe as shown in FIGS. 4 and 5, or, although not shown, an inner pipe for appropriately injecting a heat-generating solid substance or oxygen gas and air. A double pipe or the like including an outer pipe for cooling the inner pipe by appropriately injecting argon gas, nitrogen gas or the like can be exemplified.

FIG. 6 is a vertical section C- of the burner shown in FIG.
It is explanatory drawing which expands and shows C '.

Reference numeral 21 is a fuel flow path, reference numeral 22 is a primary side flow path of the combustion supporting gas, and reference numeral 23 is a secondary flow path of the combustion supporting gas.
Reference numeral 8 indicates an exothermic solid substance or oxygen gas injection pipe, and reference numeral 24 indicates a spacer partially provided on the circumference of the injection pipe 8.

FIG. 7 shows the injection pipe 8 installed in the burner 7,
It is explanatory drawing for demonstrating the Example of the supply apparatus which switches and supplies an exothermic solid substance or oxygen gas at any time.
In the figure, reference numeral 28 indicates a hopper, reference numeral 29 indicates a heat-generating solid substance, and the heat-generating solid substance 29 is injected by a carrier gas supplied from a carrier gas supply pipe 30 through a transport pipe 31 and a flexible hose 33. 8 is configured to be supplied. Further, oxygen is supplied to the injection pipe 8 by the oxygen gas supply pipe 32. Before switching between the exothermic solid substance and oxygen or after transportation is completed, the purging gas is supplied from the purging gas supply pipe 34 to the transportation pipe 31, the flexible ho
It is preferable to introduce the gas into the nozzle 33 and the injection pipe 8 to purge the inside thereof.

The kind of the exothermic solid substance 29 is preferably powder such as iron or aluminum, and the kind of carrier gas supplied to the carrier gas supply pipe for transporting the powder is, for example, air or nitrogen. Alternatively, carbon dioxide gas or the like can be used, and the type of purge gas supplied to the purge gas supply pipe 34 for purging the oxygen gas or the powder is, for example, nitrogen gas, air, or carbon dioxide gas. Can be used. Furthermore, the present invention will be described in detail with reference to examples, but this is merely an example of the present invention, and the present invention is not limited thereby.

[0039]

Embodiment 1 In one embodiment of the present invention, the capacity of 45 tons is shown in FIG.
Approximately 5 tons of metal and 0.5 tons of steel slag attached to the tundish of the shape shown in Fig. 4 are used, and the burner 7 having the structure shown in Figs. 4 and 5 is operated as shown in both figures. It was dissolved and removed in a heating time of 15 minutes. FIG. 8 is a graph showing a heating pattern, where the horizontal axis represents the heating time by the burner,
The vertical axis is the fuel (coke oven gas) supplied to the burner,
It shows the amount of each of the combustion-supporting gas (air enriched with oxygen with an oxygen concentration of 50%) and the iron powder and oxygen gas supplied and injected to the injection pipe installed in the burner. Air was used as the type of carrier gas for transporting the iron powder.

In about 2 minutes immediately after the start of heating, fuel 8
Other Nm ³ / min and the burning-supporting gas 16 Nm ³ / min, iron powder 3 kg / min
By injecting to dissolve and remove the steel slag having a relatively high melting temperature, and then 2 minutes after the start of heating, the fuel flow rate is 10 Nm ³
min, the flow rate of combustion-supporting gas was increased to 20 Nm ³ / min. In addition, during the heating time of about 4 minutes to about 6 minutes, the steel slag was dissolved and removed, and the metal appeared at the surface, and the type of substance injected from the injection pipe was ³ Nm ³ / min of oxygen gas. The metal was also dissolved and removed by utilizing the heat of oxidation reaction with oxygen. After a heating time of 15 minutes, there was no residue of metal or slag in the tundish, and heating was completed.

[0041]

Second Embodiment Another embodiment of the present invention will be described.
FIG. 9 is an explanatory view for explaining an embodiment of the present invention in the RH vacuum degassing tank. Reference numeral 35 is a RH vacuum degassing tank, reference numeral 36 is a burner, that is, a fuel injection hole, a combustion-supporting gas injection hole, and an injection pipe for injecting an exothermic solid substance and / or oxygen gas. The burners are shown respectively. Further, an exothermic solid substance or oxygen gas was switched at any time and supplied to the burner by a device similar to that shown in FIG. Further, the burner 36 can freely move in the vertical direction inside the RH vacuum degassing tank 35 and can be tilted as shown in FIG. 9 by freely changing the angle formed by the burner shaft center and the vertical. Is becoming Reference numeral 37 is a deposit, which is mainly composed of steel slag, and its temperature before heating is about 300 ° C to 400 ° C. The deposit of reference numeral 38 is a metal mainly composed of iron, and its temperature before heating is about 400 ° C to 700 ° C.
℃.

FIG. 10 is a graph for explaining an example of a heating pattern in the RH vacuum degassing tank 35,
The notation format is the same as in FIG. About 16 tons of metal can be removed in 50 minutes of heating time, and R can be removed after 50 minutes of heating.
No metal or steel slag remained inside the H vacuum degassing tank. The embodiment of the present invention shown in FIGS. 8 and 10 is an embodiment in a tundish or RH vacuum degassing tank,
The flow rates and times of the combustion-supporting gas, iron powder and oxygen gas may be appropriately selected according to the types of containers, the amount of deposits, the melting temperature and other characteristics.

[0043]

As described in detail above, in the present invention, not only the fuel and the combustion-supporting gas are injected from the burner to burn, but also the exothermic solid substance and oxygen gas are injected from the injection pipe provided inside the burner. Injecting, to dissolve and remove the ingot and steel slag attached to the molten metal container, according to the present invention, by a relatively simple method, ingot mainly composed of iron and Ca, A
It is possible to easily and quickly remove deposits even when both steel slags containing a large amount of oxides such as l and Si are present, or even when the temperature of the base metal or steel slag before heating is relatively low. It will be possible.

The method and burner for removing the deposits in the molten metal container according to the present invention are not limited to the tundish for continuous casting and the vacuum degassing tank, and other molten metal containers such as a ladle for steelmaking and It can also be applied to converters and the like. The significance of the present invention having such effects is extremely remarkable.

[Brief description of drawings]

FIG. 1 is an explanatory view illustrating an embodiment of the present invention related to a tundish for continuous casting.

FIG. 2 is an explanatory diagram illustrating a vertical section AA ′ shown in FIG.

FIG. 3 is an explanatory diagram illustrating a vertical section BB ′ shown in FIG. 1.

FIG. 4 is an explanatory view showing an example of a burner according to the present invention, showing a state in which the injection pipe is retracted.

FIG. 5 is an explanatory view showing an example of a burner according to the present invention, showing a state in which the injection pipe is moving forward.

6 is an explanatory diagram showing a vertical cross section CC ′ shown in FIG. 4. FIG.

FIG. 7 is an explanatory diagram showing a part of the configuration of a device for removing deposits in a molten metal container according to the present invention.

FIG. 8 is a graph showing a part of the operating conditions of the tundish for continuous casting in the example of the present invention.

FIG. 9 is an explanatory diagram illustrating an example in which the present invention is applied to an RH vacuum degassing tank.

FIG. 10 is a graph showing a part of the operating conditions of the RH vacuum degassing tank in the example of the present invention.

[Explanation of symbols]

1: Tundish 2a, 2b: Nozzle 3a, 3b, 3c: Tundish lid 4a, 4b: Metal 5a, 5b: Steel slag 6a, 6b: Opening hole 7a, 7b: Burner 8, 8a, 8b: Injection pipe 9a , 9b: Discharge hole 10: Pits 11a, 11b: Recovery container 12: Molten metal injection hole 13: Exhaust gas pipes 14a, 14b: Trucks 15a, 15b: Cylinders 16a, 16b: Connecting metal fittings 17: Locking metal fittings 18: Fuel supply pipe 18a : Fuel injection hole 19a: Combustion-supporting gas injection holes 19, 20: Combustion-supporting gas supply pipe 21: Fuel flow path 22: Primary-side combustion-supporting gas flow path 23: Secondary-side combustion-supporting gas path 24: Spacer 25: Seal 26: Burner tile 27: Heat shield 28: Hopper 29: Exothermic solid substance 30: Carrier gas supply pipe 31: Transport pipe 32: Oxygen gas supply pipe 33: Flexible hose 34: Purging gas supply pipe 35: RH vacuum degassing tank 36: Burner

Claims (3)

[Claims] 1. A method for dissolving and removing deposits in a molten metal container by using a burner, comprising: (i) burning by injecting fuel and combustion-supporting gas from the burner into the molten metal container; (ii) A method for removing deposits in a molten metal container, which comprises dissolving and removing the deposits by injecting an exothermic solid substance and / or oxygen gas onto the deposits. 2. A burner for removing deposits in a molten metal container, comprising a fuel injection hole, a combustion-supporting gas injection hole, and an injection pipe for injecting an exothermic solid substance and / or oxygen gas. .. 3. The burner for removing deposits in a molten metal container according to claim 2, wherein the injection pipe is reciprocally provided on a burner shaft core.