Method for filling gap between tapping hole seating brick and tapping hole tubular brick and application of method in replacement of tapping hole

Abstract

The invention provides a gap filling method for a tapping hole seat brick and a tapping hole tubular brick and application of the gap filling method in replacement of a tapping hole. The gap filling method comprises the following steps: adding a repairing material which is uniformly stirred with water into a converter mouth of the converter. And the converter is shaken to reversely rotate by-91 degrees to-98 degrees, and the condition is kept for 5-8 minutes, so that the repairing material flows into and fills a gap between the tapping hole tubular brick and the tapping hole seating brick and then is cured. And the negative rotation direction is the downward direction of the converter towards the tapping hole. And rotating and resetting the converter. According to the gap filling method for the tapping hole seating brick and the tapping hole tubular brick, the repairing material is added from the furnace mouth, the converter is shaken to enable the repairing material to flow into the gap between the tapping hole tubular brick and the tapping hole seating brick under the action of gravity, and due to the fact that the repairing material flows in the converter, part of water evaporates, the water content is low, and the repairing material is prone to sinking, the repairing material flows into the gap under the waste heat of the converter. The drying is easy; the porosity is relatively low.

Description

Technical Field

[0001] The invention relates to the field of metallurgical equipment maintenance, in particular to a method for filling gaps between a tapping hole seat brick and a tapping hole pipe brick and an application thereof in replacing a tapping hole. Background Art

[0002] The taphole is the only channel connecting the converter and the ladle. It is responsible for smoothly draining the high-temperature molten steel from the converter and injecting it into the ladle for subsequent refining, pouring and other processes. The taphole is usually composed of two main parts: the taphole base brick and the taphole pipe brick. These two parts together form the channel for the flow of molten steel and ensure stable operation under extremely high temperatures and harsh environments.

[0003] When setting the tapping port, such as when replacing the tapping port or setting the tapping port in a new converter, it is necessary to directly fill the tapping port pipe brick and the tapping port seat brick with repair materials. The existing method of filling the gap between the tapping port seat brick and the tapping port pipe brick is to use a gunning gun to spray the repair materials between the tapping port seat brick and the tapping port pipe brick. However, this method takes a long time to operate, which affects the replacement efficiency of the converter tapping port and reduces production efficiency. Summary of the invention

[0004] The main purpose of the present invention is to provide a method for filling the gap between a tapping hole seat brick and a tapping hole pipe brick and an application in replacing a tapping hole, so as to solve the technical problem that the operation time of filling the gap between the tapping hole seat brick and the tapping hole pipe brick is long.

[0005] To achieve the above object, the present invention provides a method for filling the gap between a tapping hole seat brick and a tapping hole pipe brick, comprising the following steps:

[0006] Adding a repair material to the furnace mouth of the converter, wherein the water content of the repair material is 9-11wt%;

[0007] Shake the converter to rotate negatively by -91 to -98 degrees, and keep it for 5 to 8 minutes so that the repair material flows into and fills the gap between the steel outlet pipe brick and the steel outlet seat brick and then solidifies; the negative rotation direction is the direction in which the converter rotates until the steel outlet faces downward;

[0008] The converter is rotated and reset.

[0009] According to an embodiment of the present application, the amount of the repair material added is 2-3 tons / furnace.

[0010] According to the embodiment of the present application, the repair material includes water and a repair agent, and the repair agent, in terms of mass percentage, includes: SiO2≤12%, MgO≥82%, and the volume density of the repair agent is ≥2.5g / cm 3 , the flexural strength of the repair agent is ≥8MPa.

[0011] According to an implementation manner of the present application, the converter is in the early to middle stage of a furnace campaign, and the negative rotation angle of the converter is -91° to 95°.

[0012] According to an implementation manner of the present application, the converter is in the middle and late stages of its operation, and the negative rotation angle of the converter is -93° to -98°.

[0013] According to the implementation mode of the present application, it also includes:

[0014] If the repair material does not fill the gap between the outlet pipe brick and the outlet seat brick, the converter is rotated negatively to -100-108°, and the gunning material is gunned from the inside of the converter and then cured, wherein the water content of the gunning material is 14-16wt%.

[0015] According to an embodiment of the present application, a gap filling method is performed during the repair of the converter.

[0016] According to an embodiment of the present application, the step of adding a repairing material to the furnace mouth of the converter includes:

[0017] The converter is rotated forward to 50°, and repairing material is added to the furnace mouth of the converter.

[0018] The present application also provides an application of the above-mentioned gap filling method in replacing a steel tapping port, comprising the following steps:

[0019] Replace the tapping hole pipe brick of the tapping hole.

[0020] The gap filling method described above is used.

[0021] According to an embodiment of the present application, the step of replacing the tapping hole pipe brick comprises:

[0022] The converter is rotated forward to 159-161°, and the slide mechanism and the pressure plate on the converter are disassembled.

[0023] The converter is rotated to 164-166 degrees, the tapping port is drilled out, the old and damaged tapping port pipe bricks are removed, and the slag in the tapping port is poured out.

[0024] The converter is rotated forward to 159-161 degrees, and a tapping hole pipe brick is installed at the position of the tapping hole.

[0025] In the above-mentioned method for filling the gap between the tap hole seat brick and the tap hole pipe brick, the repair material is added from the furnace mouth, and the converter is shaken to make the repair material flow into the gap between the tap hole pipe brick and the tap hole seat brick under the action of gravity. Since the water content of the repair material is low, it is easy to sink. Under the waste heat of the converter, it is easy to dry and has a low porosity. The conventional gunning method is a segmented gunning method in which the gunning material of the previous section sinks and dries before continuing the gunning. The gap filling method of the present application is a continuous repair, so it is more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of a converter according to an embodiment of the present application;

[0028] Figure 2 This is a schematic structural diagram of a converter rotating -91 to 98 degrees according to an embodiment of the present application;

[0029] Figure 3 yes Figure 2 A local enlarged schematic diagram of point A in the middle.

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings.

[0031] 100, converter; 110, tapping port; 111, tapping port base brick; 112, tapping port pipe brick; 113, gap; 120, furnace mouth; DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0035] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] A method for filling the gap between a tapping hole seat brick and a tapping hole pipe brick comprises the following steps:

[0037] S100: adding a repair material to the furnace mouth of the converter, wherein the water content of the repair material is 9-11wt%.

[0038] The conventional process of replacing the taphole of a converter is: taphole drilling - taphole pipe brick installation - filling the gap between the taphole base brick and the taphole pipe brick. Filling the gap between the taphole base brick and the taphole pipe brick is the main process of taphole replacement, which generally takes ≥20 minutes. Generally, gunning is used to fill the gap with gunning material.

[0039] Research has found that the gunning method requires the gunning material to have good fluidity, so the water content is high. However, due to the high water content of the gunning material and the small gap between the tapping hole seat brick and the tapping hole pipe brick, the gunning gun must stop when the gunning material overflows the tapping hole, and continue to spray after the gunning material sinks and dries. This operation needs to be repeated many times to fill the gap between the tapping hole seat brick and the tapping hole pipe brick, so it takes a long time. In addition, during the gunning process, compressed air needs to be blown to stir the gunning material and blow it into the gap.

[0040] Based on this, in this application, the method of gunning is abandoned, and a method for filling the gap between the tapping hole seat brick and the tapping hole pipe brick is re-studied.

[0041] After the installation of the tapping hole pipe brick is completed, if the tapping hole is replaced with a new tapping hole pipe brick or the tapping hole pipe brick of the new converter is set with a tapping hole, a repair material is added from the furnace mouth of the converter in step S100. The repair material is a material mixed evenly with water and a repair agent (such as a high-efficiency repair agent). Since the repair material mainly uses the property of flowing into the gap between the tapping hole pipe brick and the tapping hole seat brick under the action of gravity, the fluidity requirement of the repair material is reduced. Accordingly, the water content of the repair material is 9-11wt%. In some more specific embodiments, the water content of the repair material is 8-12wt%, such as 8wt%, 10wt%, and 11wt%.

[0042] The water content of the above-mentioned repair material is appropriate, so that the repair material has appropriate fluidity. That is, it is ensured that the repair material can smoothly flow into the gap between the steel outlet pipe brick and the steel outlet seat brick to fill the gap, and the curing time is shortened. If the water content of the repair material is too low, the repair material is difficult to flow into the gap between the steel outlet pipe brick and the steel outlet seat brick, and the gap may not be filled. If the water content of the repair material is too high, the curing time is longer.

[0043] The repair material is a mixture obtained by stirring the repair agent and water, and has good fluidity, short baking time and strong corrosion resistance. The repair agent, in terms of mass percentage, includes: SiO2≤12%, MgO≥82%, and the volume density of the repair agent is ≥2.5g / cm 3 , the flexural strength of the repair agent is ≥8MPa. In some specific embodiments, the repair agent is a high-efficiency rapid repair material of Hongye Furnace Material Co., Ltd. in Loudi City, Hunan Province. After adding water, the material adjusts the fluidity of the water-based material, improves the sintering performance, can be used to fill the gap between the steel outlet seat brick and the steel outlet pipe brick, and can ensure good anti-corrosion performance.

[0044] S200: Shake the converter to rotate negatively by -91 to 98 degrees, and keep it for 5 to 8 minutes so that the repair material flows into and fills the gap between the outlet pipe brick and the outlet seat brick and then solidifies. The negative rotation direction is the direction in which the converter rotates until the outlet faces downward.

[0045] Reference Figure 1 , the angle of the converter in a vertical position is defined as 0°. The converter rotating in a direction with the tapping port facing downward is defined as negative rotation, and the converter rotating in a direction with the tapping port facing upward is defined as positive rotation.

[0046] Reference Figure 2 When the converter rotates negatively by -91°~-98°, the converter is close to a horizontal state, and the steel outlet is basically vertically downward. The repair material flows to the steel outlet position of the converter as the converter rotates. In the process of flowing to the steel outlet position, the residual heat of the converter will evaporate part of the water in the repair material. It should be noted that after the steel outlet pipe bricks are installed, the external gap of the steel outlet is filled with refractory mud, that is, before S200, the above action is completed to prevent the repair material from flowing out.

[0047] Reference Figure 3 , the converter maintains a state of -91°~-98° for 5~8 minutes. In the first stage, after the repair material flows to the tapping port position of the converter, the repair material is filled into the gap between the tapping port pipe brick and the tapping port seat brick under the action of gravity. This process takes about 0.5~2 minutes. Of course, some water will evaporate in this process. In the first stage, the repair material continues to flow into the gap between the tapping port seat brick and the tapping port pipe brick to fill it, without stopping in the middle. In this way, the repair material flows in the converter, which can actually complete the furnace repair work.

[0048] In the second stage, after the repair material is filled into the gap between the tap hole pipe brick and the tap hole seat brick, it is baked under the residual heat of the converter, the water evaporates and reaches a dry state. This process generally takes less than 6 minutes. Therefore, the total duration of the first and second stages is the duration of the converter being kept at -91 to -98°. In this way, the gap between the tap hole seat brick and the tap hole pipe brick is filled. In this way, the repair material flows in the converter, which can actually complete the furnace repair work.

[0049] In step S200, in most cases, the gap between the steel outlet pipe brick and the steel outlet seat brick can be completely filled. In a few cases, a small amount of the gap between the steel outlet pipe brick and the steel outlet seat brick on the side close to the converter is not filled. The unfilled part can be repaired by other methods, such as spraying.

[0050] The method can fill the gap between the tapping hole seat brick and the tapping hole pipe brick quickly without stopping in the middle, and can directly use the high-temperature lining of the converter for baking, and can simultaneously maintain the rear large surface (i.e. the surface inside the converter), greatly shortening the filling time between the tapping hole seat brick and the tapping hole pipe brick, thereby saving the converter refilling time.

[0051] In the above-mentioned method for filling the gap between the tap hole seat brick and the tap hole pipe brick, the repair material is added from the furnace mouth, and the converter is shaken to make the repair material flow into the gap between the tap hole pipe brick and the tap hole seat brick under the action of gravity. Since the water content of the repair material is low, it is easy to sink. Under the waste heat of the converter, it is easy to dry and has a low porosity. The conventional gunning method is a segmented gunning method in which the gunning is continued after the previous section of the repair material sinks and dries. The gap filling method of the present application is a continuous repair, so it is more efficient.

[0052] According to an implementation of the present application, the amount of the repair material added is 2 to 3 tons per furnace.

[0053] In this way, the repair material flows in the converter and can actually complete the furnace repair work. Therefore, relatively more repair material is needed, and the amount of repair material added is 2 to 3 tons per furnace.

[0054] According to the embodiment of the present application, the repair material includes water and a repair agent, and the repair agent, in terms of mass percentage, includes: SiO2≤12%, MgO≥82%, and the volume density of the repair agent is ≥2.5g / cm 3 , the flexural strength of the repair agent is ≥8MPa.

[0055] In some embodiments, the converter is in the early to mid-stage of the furnace operation, and the negative rotation angle of the converter is -91° to -95°. In some specific embodiments, the angle is -92°.

[0056] The erosion degree of the large surface is very small in the early, middle and late stages. The length of the tapping port can be kept below the furnace lining, and the angle can be slightly higher by 2° to prevent the tapping port from being too high.

[0057] In some embodiments, the converter is in the middle and late stages of operation, and the negative rotation angle of the converter is -95°.

[0058] In the middle and late stages, the large surface erosion is serious, and the tapping port is basically maintained at the same level or slightly higher than the furnace lining, and the angle will be slightly lowered by 2° to ensure that the tapping port is covered under the repair material and the tapping port is flat. In some specific embodiments, the angle is -93°.

[0059] In some embodiments, it also includes:

[0060] If the repair material does not fill the gap between the outlet pipe brick and the outlet seat brick, the converter is rotated negatively to -100-108°, and the gunning material is gunned from the inside of the converter and then cured, wherein the water content of the gunning material is 14-16wt%.

[0061] The gunning material includes water and a repair agent, wherein the repair agent, in terms of mass percentage, includes: SiO2≤12%, MgO≥82%, and the volume density of the repair agent is ≥2.5g / cm 3 , the flexural strength of the repair agent is ≥8MPa.

[0062] In some embodiments, the gap filling method is performed during the reheating of the converter.

[0063] The converter refilling operation is an important part of the steelmaking process, which aims to repair the damaged part of the converter lining to extend the service life of the converter and improve production efficiency. During the converter refilling, the gap filling method is carried out. Not only the refilling is completed, but also the tapping port can be replaced, which improves work efficiency.

[0064] In some embodiments, the step of adding a repairing material to the furnace mouth of the converter includes:

[0065] The converter is rotated forward to 50°, and repairing material is added to the furnace mouth of the converter.

[0066] The present application also provides an application of the above-mentioned gap filling method in replacing a steel tapping port, comprising the following steps:

[0067] Replace the tapping hole pipe brick of the tapping hole.

[0068] The gap filling method described above is used.

[0069] In some embodiments, the step of replacing the tapping hole pipe brick comprises:

[0070] The converter is rotated forward to 159-161°, and the slide mechanism and the pressure plate on the converter are disassembled.

[0071] The converter is rotated to 164-166 degrees, the tapping port is drilled out, the old and damaged tapping port pipe bricks are removed, and the slag in the tapping port is poured out.

[0072] The converter is rotated forward to 159-161 degrees, and a tapping hole pipe brick is installed at the position of the tapping hole.

[0073] In some embodiments, the steps include:

[0074] After the gap is filled, the slide plate mechanism and the pressure plate are installed, and then the converter is rotated and reset, that is, the converter is rotated forward to reset the converter to a state of 0°, and the converter is restored to a state of normal use.

[0075] Example 1

[0076] The taphole maintenance process of the converter includes the following steps:

[0077] Preliminary preparation: shake the converter to 159°, disassemble the slide mechanism and the pressure plate, shake the converter to 166° and start drilling the taphole. After the taphole is drilled through, pour out the slag at the taphole, with a slag pouring angle of -110°. Then shake it to 160° and install the taphole pipe brick.

[0078] Gap filling: shake the converter to 50°, add 2.5 tons of repair material, wherein the water content of the repair material is 10wt%, and the repair material is obtained by mixing high-efficiency repair material and water. The repair agent, in terms of mass percentage, includes: SiO2≤12%, MgO≥82%, and the volume density of the repair agent is ≥2.5g / cm 3 The flexural strength of the repair agent is ≥8MPa. The converter is shaken to -95° and maintained for 8 minutes to allow the repair material to flow into and fill the gap between the outlet pipe brick and the outlet seat brick and solidify. The entire gap filling time is 9 minutes.

[0079] Post-processing work: shake the converter to 159°, install the slide mechanism, and reset the converter to 0°.

[0080] Example 2

[0081] The difference from Example 1 is only the gap filling step, and the other steps are the same. In the gap filling step, the amount of repair material added is 3 tons. The water content of the repair material is 15wt%. The converter is shaken to -98° and maintained for 6 minutes to allow the repair material to flow into and fill the gap between the outlet pipe brick and the outlet seat brick and solidify. The entire gap filling time is 7 minutes.

[0082] Example 3

[0083] The difference between Example 3 and Example 1 is only the gap filling step, and the other steps are the same. In the gap filling step, the amount of repair material added is 2 tons. The water content of the repair material is 8wt%. The converter is shaken to -92° and maintained for 5 minutes so that the repair material flows into and fills the gap between the outlet pipe brick and the outlet seat brick and then solidifies. The entire gap filling time is 6 minutes.

[0084] Example 4

[0085] The difference between Example 4 and Example 1 is only the gap filling step, and the other steps are the same. In the gap filling step, the amount of repair material added is 2 tons. The water content of the repair material is 5wt%. The converter is shaken to -92° and maintained for 6 minutes to allow the repair material to flow into and fill the gap between the outlet pipe brick and the outlet seat brick and solidify. The entire gap filling time is 7 minutes.

[0086] Example 5

[0087] The difference between Example 5 and Example 1 is only the gap filling step, and the other steps are the same. In the gap filling step, the amount of repair material added is 2 tons. The water content of the repair material is 5wt%. The converter is shaken to -92° and maintained for 6 minutes to allow the repair material to flow into and fill the gap between the steel outlet pipe brick and the steel outlet seat brick and then solidify. After observing that there is a small amount of unfilled gap between the steel outlet pipe brick and the steel outlet seat brick after solidification, the converter is rotated negatively to -100~-108°, and the gunning material is gunned from the inside of the converter and then solidified. The water content of the gunning material is 14-16wt%. The entire gap filling time is 9 minutes.

[0088] Comparative Example 1

[0089] The only difference from Example 1 is that in the gap filling step, the water content of the repair material is 2wt%, and the rest is exactly the same. After curing, it is found that the gap between the tapping port pipe brick and the tapping port seat brick is not fully filled, and there are a lot of voids.

[0090] Comparative Example 2

[0091] The only difference from Example 1 is that in the gap filling step, the water content of the repair material is 18 wt %, and the rest is exactly the same. Under this condition, the repair material is not cured.

[0092] Comparative Example 3

[0093] The only difference from Example 1 is in the gap filling step.

[0094] Gap filling: shake the converter to -101°, and use gunning material for gunning, the water content of the gunning material is 15wt%. The gunning material is obtained by mixing high-efficiency fast-filling material and water. The repair agent, in terms of mass percentage, includes: SiO2≤12%, MgO≥82%, and the volume density of the repair agent is ≥2.5g / cm 3 , the flexural strength of the repair agent is ≥8MPa.

[0095] During the repair process, the repair was performed in sections for multiple times, with a total of 3 repairs. The curing time for each repair was 10 minutes. The total time for filling the gap was 30 minutes.

[0096] The above technical solutions of the present invention are only preferred embodiments of the present invention, and the patent scope of the present invention is not limited thereto. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for filling the gap between a tapping hole seat brick and a tapping hole pipe brick, characterized in that: The following steps are involved: Adding a repair material to the furnace mouth of the converter, wherein the water content of the repair material is 9-11wt%; The converter is shaken to rotate negatively by -91 to -98 degrees, and maintained for 5 to 8 minutes to allow the repair material to flow into and fill the gap between the outlet pipe brick and the outlet seat brick and then solidify; the negative rotation direction is the direction in which the converter rotates until the outlet faces downward.

2. The gap filling method according to claim 1, characterized in that: The amount of the repair material added is 2 to 3 tons per furnace.

3. The gap filling method according to claim 1, characterized in that: The repair material includes water and a repair agent, wherein the repair agent, in terms of mass percentage, includes: SiO2≤12%, MgO≥82%, and the volume density of the repair agent is ≥2.5g / cm 3 , the flexural strength of the repair agent is ≥8MPa.

4. The gap filling method according to claim 1, characterized in that: The converter is in the early to middle stage of furnace service, and the negative rotation angle of the converter is -91° to -95°.

5. The gap filling method according to claim 1, characterized in that: The converter is in the middle and late stages of furnace operation, and the negative rotation angle of the converter is -93° to -98°.

6. The gap filling method according to claim 1, characterized in that: Also includes: If the repair material does not fill the gap between the outlet pipe brick and the outlet seat brick, the converter is rotated negatively to -100 to -108°, and the gunning material is gunned from the inside of the converter and then cured, wherein the water content of the gunning material is 14-16wt%.

7. The gap filling method according to claim 1, characterized in that: During the converter repair period, the gap filling method is carried out.

8. The gap filling method according to claim 1, characterized in that: The step of adding a repairing material to the furnace mouth of the converter comprises: The converter is rotated forward to 50°, and repairing material is added to the furnace mouth of the converter.

9. Application of the gap filling method according to any one of claims 1 to 7 in replacing a steel tapping hole, characterized in that: The following steps are involved: Replacing the tapping hole pipe brick of the tapping hole; A gap filling method according to any one of claims 1 to 8 is adopted.

10. The use according to claim 9, characterized in that: The step of replacing the tapping hole pipe brick comprises: Rotate the converter forward to 159-161°, and remove the slide mechanism and the pressing plate on the converter; The converter is rotated to 164-166 degrees, the tapping hole is drilled out, the old and damaged tapping hole pipe bricks are broken, and the slag in the tapping hole is poured out; The converter is rotated forward to 159-161 degrees, and a tapping hole pipe brick is installed at the position of the tapping hole.

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