WO2022001874A1 - Slag-splashing fettling method - Google Patents

Abstract

Disclosed is a slag-splashing fettling method for maintenance of furnace bottom. When the height of erosion of a converter bottom lining does not exceed the first height of erosion, a slag-splashing operation is performed on a converter by using a slag pouring and splashing process; when the height of erosion of the converter bottom lining exceeds the first height of erosion but does not exceed the second height of erosion, the slag-splashing operation is performed on the converter by using a slag mixing and splashing process; when the height of erosion of the converter bottom lining exceeds the second height of erosion, a fettling operation is performed on the converter by using a fettling material rapid fettling process; and in the slag splashing and fettling process, bottom blowing supply is performed on the converter, and the air supply flow is adjusted gradually over time. Whether there is a depression at a bottom blowing port is determined by using the slag mixing and splashing process, and if there is a depression at the bottom blowing port, the fettling operation is performed on the converter by using the fettling material rapid fettling process. The slag-splashing fettling method of the present invention adopts a converter slag splashing and fettling process matching the converter production rhythm, improving the converter bottom blowing efficiency and prolonging the service life of the bottom blowing port.

Description

A method of slag splashing for furnace repair technical field

The invention relates to an iron and steel smelting technology, in particular to a slag splashing and repairing method for furnace bottom maintenance.

Background technique

In the process of converter steelmaking, the furnace lining in the converter will be eroded to varying degrees due to the high temperature and high oxidizing environment in the converter hearth. Especially in the smelting process of low carbon steel, the erosion and damage of the furnace lining is more serious. If the height of the furnace lining at the bottom of the furnace decreases, the furnace age will be shortened. In addition, since the current converters all use top-bottom combined blowing, the bottom of the converter is provided with a bottom blowing gas supply element. Although the bottom blowing of the converter can effectively promote the stirring of the metal molten pool, the increase in the strength of the bottom blowing gas supply is conducive to improving the stirring. However, the increase in the strength of the bottom blowing air supply will also lead to aggravated erosion of the bottom blowing port and its surrounding bricks, which will also lead to a shortening of the furnace age. Therefore, improving the maintenance effect of the furnace bottom lining and the bottom air outlet is an important way to prolong the furnace life.

The Chinese patent (CN106906329B) discloses a method for controlling the exposure of the bottom blowing gun of the converter. The method adopts ^{a large bottom blowing flow rate of 500-600 m 3} /h in the process of the converter tapping, and after the slag splashing operation is completed, the The bottom blowing flow rate of the bottom blowing gun is reduced to 150-200 m ³ /h, so that the mushroom head with low melting point can be formed above the bottom blowing gun. By adopting this method, in the early stage of converter blowing, the mushroom head with low melting point above the bottom blow gun can be rapidly melted, so as to ensure that the bottom blow gun is exposed, improve the bottom blow effect, and reduce the carbon and oxygen accumulation at the end of the converter.

Chinese patent application (CN110863076A) discloses a method of maintaining the converter bottom blowing tuyeres, the process is ended in the steel converter, down converter slag before, by bottom blowing converter element blown CH ₄ mixed gas of nitrogen gas and ambient air to cool the slag . Using the difference in cooling energy of the two gases to achieve specific cooling energy and gas supply intensity, different cooling energy can be achieved under the same bottom blowing flow rate, and it can be adjusted according to the requirements of the converter tuyere maintenance process, so as to realize the control of furnace bottom gold. Effective control of the slag mushroom head, thus realizing the maintenance of the converter tuyere.

The above-mentioned inventive methods all propose methods for exposing and maintaining the bottom tuyere, but neither the bottom blowing air supply control process nor the bottom blowing vent maintenance can achieve both erosion maintenance and ventilation effects.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a slag splashing and furnace repairing method that is beneficial to the maintenance of the furnace bottom. The slag splashing and furnace repairing method of the present invention improves the slag splashing and furnace repairing process, and adopts the converter slag splashing and furnace repairing that matches the production rhythm of the converter. The technology improves the bottom blowing efficiency of the converter and prolongs the life of the bottom blowing port.

In order to realize above-mentioned technical purpose, the present invention adopts following technical scheme:

A method for repairing furnace by splashing slag, comprising:

After each tap of the converter is completed, if the eroded height of the bottom lining of the converter does not exceed the first erosion height, the slag splashing process shall be used to perform the slag splashing operation on the converter. Bottom blowing air supply, the air supply flow rate is 1000Nm ³ /h ~ 1600Nm ³ /h (standard cubic meters per hour), and is gradually adjusted within the above interval with time.

After the tapping of each furnace of the converter, if the eroded height of the bottom lining of the converter exceeds the first erosion height but does not exceed the second erosion height, the slag splashing process shall be used to carry out the slag splashing operation on the converter. In the process, the bottom blowing gas supply is implemented to the converter, and the gas supply flow rate is 400Nm ³ /h～1200Nm ³ /h, and is gradually adjusted within the above interval with time.

After each tap of the converter is finished, if the eroded height of the bottom lining of the converter exceeds the second erosion height, the converter shall be repaired by the fast repairing process of the repairing material. During the repairing operation, the converter shall be repaired. Bottom blowing air supply, the air supply flow rate is 400Nm ³ /h ~ 1600Nm ³ /h, and is gradually adjusted within the above interval with time.

In the above technical solution, the reference zero position of the erosion height (thickness of the furnace bottom) changes according to the age of the converter, and is expressed according to the following empirical formula: H=H ₀ -a×L. In the formula, H represents the reference zero position (the thickness of the furnace bottom, mm), H ₀ represents the original furnace bottom thickness (mm), a is the coefficient (value range 0.06~0.08), L is the furnace age (value range 1~10000 , times; if the actual furnace age exceeds 10,000 times, it will be calculated as 10,000 times).

Further, the slag splashing repairing method further includes: when the eroded height of the bottom lining of the converter exceeds the first erosion height but does not exceed the second erosion height, after the slag splashing process is used to perform the slag splashing operation on the converter, It is judged whether there is a depression at the bottom air outlet. If there is a depression, the converter is repaired by the fast charging process of the charging material. If there is no depression, the converter is repaired by the slag repairing process.

Specifically, the slag repairing process includes: after the slag splashing operation is completed, the slag hanging operation of the shaking furnace is performed; after the slag hanging operation of the shaking furnace is completed, the slag cooling and repairing operation of the converter is performed after a period of standing time. Among them, the slag hanging operation of the shaking furnace refers to: by rotating the converter to the charging side and the tapping side, the molten slag is coated on the furnace bottom during the rotation process to achieve the purpose of uniformly increasing the thickness of the furnace bottom; the slag cooling and repairing operation refers to : Through slag cooling, the molten slag becomes solid slag and condenses on the bottom of the furnace and does not flow to achieve the purpose of repairing the furnace.

Specifically, the slag adjustment and splashing process includes: judging whether the amount of slag after the converter is tapped is greater than 1/10 of the capacity of the converter; To the slag splashing gun position, the oxygen lance is used to blow nitrogen and slag splashing on the slag; after the nitrogen slag splashing operation starts, limestone is added first, and then nitrogen is blown; dolomite is added during the slag splashing operation, and the oxygen lance is controlled to implement the sliding gun operate.

Specifically, the quick repairing process of the charging material includes: pouring out all the slag, then adding the charging charging into the furnace, shaking the furnace after the charging charging is melted, and making the charging charging flow to the position where the charging is required. Wherein, the charging material is a magnesium carbonaceous material with a mass percentage content of 75-77% of magnesium oxide and a particle size of 5-8 mm. The main components of the charging material are, for example, 75-77% by mass of magnesium oxide, 6-10% by mass of carbon, and a small amount of pitch and binder.

Specifically, the process of pouring slag first and then splashing slag includes: pouring out 1/3-1/2 of the amount of slag slag; lowering the height of the oxygen lance to the cooling lance position, and the oxygen lance performs a nitrogen blowing cooling operation on the slag; The height of the oxygen lance reaches the slag splashing lance position, and the oxygen lance performs nitrogen blowing and slag splashing operation on the slag.

Further, in a converter with a capacity of 100-350t, the first erosion height can be set in the range of 80-120 mm, and the second erosion height can be set in the range of 180-220 mm. Specifically, the first erosion height was 100 mm, and the second erosion height was 200 mm.

In the slag splashing repairing method provided by the present disclosure, when the eroded height of the bottom lining of the converter does not exceed the first erosion height, that is, in the initial stage of the converter furnace, the slag splashing process can be shortened by first pouring the slag and then splashing the slag. By adopting this process, the retention time of slag in the converter is not long, and the time for erosion of the bottom air outlet and furnace lining of the converter is short, so that the bottom air vent and furnace bottom lining of the converter can be well maintained, and splashing can be reduced. Slag cost.

In the slag splashing repair method provided by the present disclosure, when the eroded height of the bottom lining of the converter exceeds the first erosion height but does not exceed the second erosion height, that is, in the middle stage of the converter furnace, the slag slag splashing process is adopted, and the slag splashing process is adopted. The content of MgO in the slag can reduce the erosion rate of the bottom air outlet and the bottom lining of the converter, and at the same time, it can also shorten the slag splashing time and improve the operating efficiency of the converter. Further, the slag filling furnace process can also be used, and the slag slag after slag splashing has the characteristics of high MgO content. After a period of standing time, a layer of slag can be covered on the bottom air outlet and the furnace bottom lining, thereby slowing down the bottom air blowing of the converter. The erosion rate of the refractory material at the mouth and the bottom of the furnace, while maintaining the air permeability of the bottom air outlet.

In the slag splashing repairing method provided by the present disclosure, when the eroded height of the bottom lining of the converter exceeds the second erosion height, that is, in the later stage of the converter's furnace operation, the furnace repairing process is adopted. The fluidity of the charging material is good, and the sintering speed is fast. Using the charging material to repair the furnace is fast, the repairing quality of the depression in the bottom of the furnace is high, and the corrosion resistance is good. .

Compared with the prior art, the slag splashing and furnace repairing method provided by the present disclosure has the beneficial effects of shortening the slag splashing time by improving the slag splashing and furnace repairing processes. The converter slag splashing and repairing process matched with the production rhythm not only controls the erosion rate of the bottom lining and bottom blowing port of the converter, but also ensures the metallurgical effect of the bottom blowing port, thereby improving the bottom blowing efficiency of the converter and prolonging the bottom blowing rate. The life of the air outlet realizes the purpose of synchronizing the life of the bottom air outlet with the furnace age of the converter.

detailed description

The present invention is further described below by specific embodiment:

This embodiment provides a slag splashing repairing method that is beneficial to furnace bottom maintenance. The implementation background of this embodiment is a converter steelmaking operation area of an iron and steel enterprise, and the slag splashing repairing method is implemented for a 300t converter in the operation area. Generally speaking, after the new furnace operation of the converter is started, that is, after the new furnace lining is started, after the tapping of each furnace is completed, the slag splashing repair method provided by the present disclosure is implemented on the converter.

The slag splashing and furnace repairing method includes:

After each tap of the converter is completed, if the eroded height of the bottom lining of the converter does not exceed the first erosion height, the slag splashing operation is performed on the converter by the process of pouring slag first and then slag splashing. Bottom blowing air supply, the air supply flow is gradually adjusted over time.

After the tapping of each furnace of the converter, if the eroded height of the bottom lining of the converter exceeds the first erosion height but does not exceed the second erosion height, the slag splashing process is used to carry out the slag splashing operation on the converter. During the slag splashing process , the bottom blowing gas supply is implemented to the converter, and the gas supply flow is gradually adjusted over time.

After the tapping of each heat of the converter, if the eroded height of the bottom lining of the converter exceeds the second erosion height, the converter shall be repaired by the fast repairing process with the repairing material. During the repairing process, the bottom of the converter shall be repaired. Blow air supply, and the air supply flow is gradually adjusted over time.

In the process of slag splashing and furnace repair provided by the present disclosure, bottom blowing gas supply is implemented to the converter, and the gas supply flow rate is gradually adjusted over time. Maintaining a certain bottom blowing flow rate can prevent the bottom blowing port from being blocked during the slag splashing repair process, and since the viscosity of the slag will change during the slag splash repairing process, the flow rate needs to be adjusted during the gas supply process. Generally speaking, the slag will become more viscous with time, so the bottom blowing flow is usually increased gradually with time; however, when the slag adjustment and slag splashing process is implemented, the heat of the slag is needed to melt the intermediate process of slag splashing. When adding dolomite and other slag-adjusting materials, it is necessary to adjust the bottom blowing air supply flow to reduce the heat loss of the slag and facilitate the melting of the dolomite, and then increase the flow. In the control system of bottom blowing gas supply, automatic control modes are set for the process of pouring slag first and then splashing slag, adjusting slag and splashing slag, repairing slag, and quickly repairing the furnace. Automatic control adjustment of air supply flow.

In the above process, the first erosion height and the second erosion height can be adjusted according to the actual situation of the converter. Generally speaking, in order to maintain the uniformity of the erosion of the converter lining and the safety of the use of the furnace lining, the first erosion height and the second erosion height can be adjusted according to the actual situation of the converter. For converters with long furnace age, the first erosion height and the second erosion height can be reduced. If the converter age is greater than 8000 times, the first erosion height can be 80mm, and the second erosion height can be 180mm; if the converter age is less than 4000 times, the second erosion height The first erosion height may be 120mm, and the second erosion height may be 220mm. In this embodiment, the first erosion height is preferably 100 mm, and the second erosion height is preferably 200 mm.

Preferably, the slag splashing repairing method further comprises: when the eroded height of the bottom lining of the converter exceeds the first erosion height but does not exceed the second erosion height, after the slag splashing operation is performed on the converter using the slag-adjusting and slag-splashing process, It is judged whether there is a depression at the bottom air outlet. If there is a depression, the converter is repaired by the fast charging process of the charging material. If there is no depression, the converter is repaired by the slag repairing process. In the normal high-rhythm continuous production process of the converter, under the condition that the converter does not stop, there is not too much time for the repairing operation, so only the slag-adjusting and slag-splashing process is used to carry out the slag splashing operation on the converter; however, when the production rhythm is slow , the converter has a stop time, in this case, the converter can be repaired after the slag splashing operation, so that the converter can be fully maintained.

The process of pouring the slag first and then splashing the slag includes: pouring out 1/3-1/2 of the amount of slag; lowering the height of the oxygen lance to the cooling lance position, and the oxygen lance performs a nitrogen blowing cooling operation on the slag; then, lowering the height of the oxygen lance To the slag splashing gun position, the oxygen lance performs nitrogen blowing and slag splashing operation on the slag. The advantage of the process of pouring slag first and then splashing slag is that the time of slag splashing can be shortened. The furnace bottom lining is well maintained and the cost of slag splashing is reduced.

The slag adjusting and splashing process includes: judging whether the amount of slag is sufficient after the converter is tapped, and the basis for judging whether the amount of slag is sufficient is whether the amount of slag is greater than 1/10 of the capacity of the converter, and if so, first pour out 1/3 of the amount of slag ～1/2; then, lower the height of the oxygen lance to the slag splashing lance position, and the oxygen lance performs nitrogen blowing and slag splashing operation on the slag. After the nitrogen blowing slag splashing operation starts, usually within 1min, add limestone 500～1000kg; then, 500-1000kg of dolomite was added during the nitrogen blowing and slag splashing operation, and the oxygen lance was controlled to carry out the sliding lance operation. The advantage of the slag adjustment and splashing process is that by adjusting the slag, the content of MgO in the slag is increased, the erosion rate of the air outlet at the bottom of the converter and the lining of the furnace bottom is reduced, and the slag splashing time is shortened and the operation efficiency of the converter is improved.

The slag repairing process includes: after the slag splashing operation is completed, the shaking furnace slag hanging operation is performed; after the shaking furnace slag hanging operation is completed and a period of standing time is passed, the slag cooling and furnace repairing operation is performed. The advantage of the slag repair process is that the slag after slag splashing has a high content of MgO. After a period of standing time, a layer of slag can be covered on the bottom air vent and the furnace bottom lining to slow down the converter bottom air vent and furnace bottom refractories. erosion rate while maintaining the breathability of the bottom air vents.

The rapid furnace repairing process of the charging material includes: pouring out all the slag; adding the charging charging material into the furnace, and shaking the furnace after the charging charging material is melted, so that the charging charging material flows to the position where the charging furnace is required. The advantages of the quick repairing process with the repairing charge are that the fluidity of the repairing charge is good and the sintering speed is fast, so the speed of repairing the furnace with the repairing charge is fast, the repair quality of the depression in the bottom of the furnace is high, and the corrosion resistance is good, which can slow down the bottom of the converter. Melting loss rate of blow vent and furnace bottom lining.

In the present embodiment, although only the eroded height of the furnace bottom lining is judged, the eroded height of the furnace bottom lining can actually reflect the degree of erosion of the bottom blowing port. That is to say, the maintenance objects targeted by the slag splashing and furnace repairing method in this embodiment include the furnace bottom and the bottom air outlet.

The slag splashing and furnace repairing method of the present embodiment shortens the slag splashing time by improving the slag splashing and furnace repairing processes, and adopts the converter slag splashing and repairing methods that match the production rhythm of the converter according to the blowing port at the bottom of the converter and the erosion rate of the furnace bottom lining. The furnace process not only controls the erosion rate of the bottom lining of the converter and the bottom blowing port, but also ensures the metallurgical effect of the bottom blowing port, thereby improving the bottom blowing efficiency of the converter, prolonging the life of the bottom blowing port, and realizing the bottom blowing port. The purpose of synchronizing the service life with the age of the converter.

Specific examples are given below for different furnace bottom erosion conditions.

Example 1:

Taking a converter with a nominal capacity of 300 t (tons) and bottom blowing 8 branches as an example, the converter is implemented with the slag splashing repair method of the present invention.

The first erosion height is set to 100mm. When the eroded height of the converter bottom lining is less than 100mm, that is, the eroded height of the converter bottom lining does not exceed the first erosion height, the process of pouring slag first and then splashing slag is implemented. The implementation process is as follows:

After the converter tapping is completed, shake the furnace and observe the amount of slag, and then continue to shake the furnace to pour out 1/3 of the amount of slag.

Shake the furnace to the zero position, lower the height of the oxygen lance to the cooling lance position, and open the oxygen lance to blow nitrogen to cool the slag. The cooling operation is maintained for 10 to 30 seconds.

Lower the height of the oxygen lance to the position of the slag splashing lance, and the oxygen lance performs the nitrogen blowing and slag splashing operation on the slag, and the slag splashing operation is maintained for 60-120 seconds.

During the above-mentioned slag splashing process, the converter implements bottom blowing air supply, and the air supply flow is gradually increased with time, specifically: 1200Nm ³ /h in the stage of 0-60 ^{seconds; 1400Nm 3} /h in the stage of 60-120 seconds; 120 seconds ^{1600Nm 3} /h to the end stage.

Example 2:

Taking a converter with a nominal capacity of 300t and 8 branches of bottom blowing as an example, the converter is implemented with the slag splashing repair method of the present invention.

The first erosion height is set to 100mm, and the second erosion height is set to 200mm. When the eroded height of the converter bottom lining is greater than 100mm but less than 200mm, that is, the eroded height of the converter bottom lining exceeds the first erosion height but does not exceed the first erosion height. Second, when the erosion height is high and the production rhythm of the converter is tense, the slag adjustment and slag splashing process is implemented. The implementation process is as follows:

After the converter is tapped, shake the furnace and observe whether the amount of slag is sufficient, that is, to determine whether the amount of slag is greater than 1/10 of the capacity of the converter, and if the amount of slag is sufficient, continue to shake the furnace to pour out 1/2 of the amount of slag.

Shake the furnace to the zero position, lower the height of the oxygen lance to the slag splashing lance position, and the oxygen lance performs nitrogen blowing and slag splashing operation on the slag. After the nitrogen blowing and slag splashing operation starts, 500kg of limestone is added.

When the nitrogen blowing and splashing operation is carried out to the stage of 30 to 90 seconds, 1000 kg of dolomite is added.

Control the oxygen lance position for slide gun operation.

In the process of slag splashing, gas bottom blowing converter embodiments, gas flow rate gradually adjusted over time, specifically: 0 to 30 seconds stage 1000Nm ³ / h; 30 ~ 120 seconds stage 800Nm ³ / h; 120 seconds The end stage is 1200Nm ³ /h. Among them, the bottom blowing air supply flow rate was reduced in the 30-120 second stage, in order to fully melt the dolomite added in this stage by using the heat of the slag. If the air supply flow rate is high, it is not conducive to the melting of the dolomite.

Example 3

Taking a converter with a nominal capacity of 300t and 8 branches of bottom blowing as an example, the converter is implemented with the slag splashing repair method of the present invention.

The first erosion height is set to 100mm, and the second erosion height is set to 200mm. When the eroded height of the converter bottom lining is greater than 100mm but less than 200mm, that is, the eroded height of the converter bottom lining exceeds the first erosion height but does not exceed the first erosion height. Second, when the erosion height is high, and the production rhythm of the converter is not tense, and the converter has a stop time, the slag adjustment and slag splashing process is carried out and then the slag repair process is carried out. The implementation process is as follows:

When the converter is finished tapping, if it is judged that the amount of slag is not sufficient, the slag will not be poured.

Shake the furnace to the zero position, lower the height of the oxygen lance to the slag splashing lance position, and the oxygen lance performs nitrogen blowing and slag splashing operation on the slag. After the nitrogen blowing slag splashing operation starts, 1000kg of limestone is added.

When the nitrogen blowing slag splashing operation is carried out to the stage of 60 to 120 seconds, 1000 kg of dolomite is added.

Control the oxygen lance for slide gun operation.

During the above-mentioned nitrogen blowing and slag splashing operation, the converter implements bottom blowing and gas supply, and the gas supply flow rate is gradually adjusted over time, and the specific flow rate is the same as that in Example 2.

After the slag splashing operation is completed, the slag hanging operation of the shaking furnace is carried out, and the slag hanging back and forth of the shaking furnace is 1 to 3 times.

After the slag hanging operation of the shaking furnace is completed, the furnace is shaken to the zero position, and the slag cooling and furnace repairing operation is carried out after a period of 20-40 minutes of standing time.

During the standing time and the subsequent slag cooling and repairing process, the converter continues to implement bottom blowing gas supply, and the gas supply flow rate is gradually increased with time. The specific flow rate is: 560Nm ³ /h in the stage of 0-5 minutes; The minute stage is 640Nm ³ /h; the 10-20 minute stage is 800Nm ³ /h; the 20-minute to end stage is 1000Nm ³ /h.

Example 4

Taking a converter with a nominal capacity of 300t and 8 branches of bottom blowing as an example, the converter is implemented with the slag splashing repair method of the present invention.

The second erosion height is set to 200mm. When the eroded height of the converter bottom lining is greater than 200mm, that is, the eroded height of the converter bottom lining exceeds the second erosion height, the fast-repairing process of the charging material is implemented. The implementation process is as follows:

After the tapping of the converter is completed, all the slag is poured out by shaking the furnace.

Shake the furnace until the mouth of the furnace faces the side, and add 2 bags (700kg per bag) of fast charging materials into the furnace.

When the charging material is melted, shake the furnace to make the charging material flow to the pit of the required charging furnace, or shake the furnace back and forth so that the charging charging material is coated on the bottom of the furnace.

In the fettling process gas bottom blowing converter embodiments, gas flow rate over time to gradually turn up, specifically: Phase 0 to 5 minutes was 480Nm ³ / h; 5 ~ 10 minutes in a stepwise was 720Nm ³ / h; 10 ~ 20 minutes stage 800Nm ³ / h; 20 minutes to end phase of 1000Nm ³ / h.

The above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the present invention. within the scope of protection of the invention.

Claims (8)

A method for repairing furnace by splashing slag, characterized in that: After the tapping of each furnace of the converter, if the eroded height of the bottom lining of the converter does not exceed the first erosion height, the slag splashing operation is performed on the converter by the process of pouring slag first and then slag splashing. Blow air supply, the air supply flow is gradually adjusted with time; After the tapping of each furnace of the converter, if the eroded height of the bottom lining of the converter exceeds the first erosion height but does not exceed the second erosion height, the slag splashing process shall be used to carry out the slag splashing operation on the converter. , implement bottom blowing gas supply to the converter, and the gas supply flow is gradually adjusted over time; After each tap of the converter, if the eroded height of the bottom lining of the converter exceeds the second erosion height, the converter shall be repaired by the fast repairing process with the repairing material. During the repairing operation, the bottom of the converter shall be repaired. Blow air supply, and the air supply flow is gradually adjusted over time. The method for repairing furnace with slag splashing according to claim 1, wherein the method for repairing furnace with slag splashing further comprises: if the eroded height of the bottom lining of the converter exceeds the first erosion height but does not exceed the second erosion height After the slag splashing operation is performed on the converter using the slag-adjusting and slag-splashing process, it is judged whether there is a depression at the bottom air outlet. The slag patching process implements patching operations on the converter. The slag splashing and furnace repairing method according to claim 2, characterized in that, the slag repairing furnace process comprises: after the slag splashing operation is completed, a slag-removing operation is performed; After the time, the slag cooling and repairing operation is carried out. The slag splashing repairing method according to claim 1 or 2, wherein the slag adjusting and slag splashing process comprises: judging whether the amount of slag after tapping in the converter is greater than 1/10 of the capacity of the converter, and if so, pouring out the slag first 1/3 to 1/2 of the amount of slag slag; then, lower the height of the oxygen lance to the slag splashing lance position, and the oxygen lance performs nitrogen blowing and slag splashing operation on the slag, and limestone is added after the nitrogen blowing and slag splashing operation starts; Dolomite was added during the nitrogen blowing and slag splashing operation, and the oxygen lance was controlled to implement the slide gun operation. The slag splashing repairing method according to claim 1 or 2, characterized in that, the fast repairing process of the blasting material comprises: after all the slag is poured out, adding blasting blasting charge into the furnace, and shaking the furnace after the blasting blasting blasting charge is melted. The refill material flows to the position where the refill is required. The slag splashing repairing method according to claim 1, wherein the process of pouring slag first and then splashing slag comprises: pouring out 1/3-1/2 of the amount of slag; reducing the height of the oxygen lance to the cooling lance position , the oxygen lance performs nitrogen blowing cooling operation on the slag; then, the height of the oxygen lance is lowered to the slag splashing lance position, and the oxygen lance performs nitrogen blowing and slag splashing operation on the slag. The method according to claim 1, wherein in a converter with a capacity of 100-350t, the first erosion height is set in the range of 80-120 mm, and the second erosion height is set in the range of 80-120 mm. Within the range of 180 to 220mm. The slag splash repairing method according to claim 1, characterized in that, in a converter with a capacity of 100-350t, the first erosion height is 100 mm, and the second erosion height is 200 mm.