CN213570558U - Structure for laying graphite safety wall on hot surface of cooling wall of blast furnace hearth - Google Patents
Structure for laying graphite safety wall on hot surface of cooling wall of blast furnace hearth Download PDFInfo
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- CN213570558U CN213570558U CN202022032112.9U CN202022032112U CN213570558U CN 213570558 U CN213570558 U CN 213570558U CN 202022032112 U CN202022032112 U CN 202022032112U CN 213570558 U CN213570558 U CN 213570558U
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Abstract
The utility model discloses a structure for building a graphite safety wall on the hot surface of a cooling wall of a blast furnace hearth, which comprises a circumferential side wall, a containing space arranged in the circumferential side wall and a high-conductivity graphite brick safety wall arranged on the circumferential side wall; the furnace bottom is paved on 1-7 layers in a layered manner; the utility model discloses an increase high graphite brick and build by laying bricks or stones into the safety wall between hearth stave hot side and hearth carbon brick in design of blast furnace hearth and the refractory masonry of hearth, the theory on application intensive cooling formation condensation layer effectively resists "elephant foot shape" erosion of blast furnace hearth lateral wall, reaches the purpose that prolongs the blast furnace life-span, and the graphite brick safety wall of high heat conduction can effectively take precautions against the hearth and burn the accident in addition.
Description
Technical Field
The utility model relates to the technical field of blast furnace smelting protection, in particular to a structure of a graphite safety wall built on the hot surface of a cooling wall of a blast furnace hearth.
Background
The damage degree of the blast furnace bottom and the hearth determines the first-generation service life of the blast furnace, and in the practice of iron-making production, the corrosion mechanism of the blast furnace bottom and the hearth is researched a lot and mainly comprises mechanical corrosion and chemical corrosion. According to the analysis of erosion mechanism, the main factors influencing the service life of the carbon bricks of the hearth and the hearth of the furnace comprise high temperature, thermal reaction, alkali metal erosion, penetration of molten iron to the carbon bricks, oxidation reaction erosion of the carbon bricks, carbon deposition after CO decomposition, erosion of flowing unsaturated molten iron to the carbon bricks, design defects and construction quality of the hearth of the blast furnace, operation and maintenance of the blast furnace in normal production and the like.
The shapes of blast furnace bottom and hearth erosion mainly include two types, namely 'bottom of a boiler' erosion and 'foot-shaped' erosion. The 'pot bottom-shaped' corrosion is usually prevented by a solidified layer formed by cooling the furnace bottom, so that the furnace bottom and the furnace hearth of the blast furnace have longer service life. The foot-like corrosion is mainly caused by the poor air permeability and liquid permeability of a dead material column in the center of the blast furnace, the circulating flow of molten iron in a hearth develops, and molten iron at the edge of the corner of the furnace bottom invades into a seam and a side wall carbon brick to cause annular corrosion. If the erosion penetrates into the circumferential seams, the hearth is at risk of burning through.
At present, the structures of the hearth and the bottom of the blast furnace at home and abroad mainly have three forms: building a large carbon brick, and arranging a ceramic pad at the bottom of the furnace; hot pressing the small carbon bricks, and arranging a ceramic pad at the bottom of the furnace; the large and small carbon bricks are built in layers, and the bottom of the furnace is provided with a ceramic pad. The modern blast furnace hearth generally adopts a structure of laying high-conductivity graphite bricks, microporous carbon bricks, ultramicropore carbon bricks and ceramic pads in layers. The blast furnace with the structure has limited resistance to the foot-shaped erosion of the side wall of the hearth in the practice of iron-making production, and the blast furnace at the later stage of the campaign usually adopts furnace protection measures such as titanium ore furnace protection, local tuyere blockage, smelting strength control and the like due to high temperature of the side wall of the hearth, thereby influencing the economic and technical indexes of the blast furnace. The side wall of the hearth in the later stage of the furnace service has high temperature, and even hearth burnthrough accidents can happen if furnace protection measures are not in time or are not in place. The hearth burnthrough accident happens frequently in the production of blast furnaces at home and abroad, the current main measures for preventing the accident mainly control the temperature of the side wall of the hearth at the later stage of the furnace service and adopt effective furnace protection measures for development, and the precautionary measures for the accident are not provided in the process of constructing the blast furnace.
SUMMERY OF THE UTILITY MODEL
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract of the specification and the title of the application to avoid obscuring the purpose of this section, the abstract of the specification and the title of the application, and such simplifications or omissions are not intended to limit the scope of the invention.
In view of the problems existing in the prior art, the utility model discloses a.
Therefore, the utility model solves the technical problems of the erosion of the side wall of the blast furnace hearth like a foot, and the burning-through accidents of the hearth caused by serious erosion of the carbon bricks at the later stage of the blast furnace hearth and high temperature of the side wall of the hearth.
In order to solve the technical problem, the utility model provides a following technical scheme: a structure for building a graphite safety wall on the hot surface of a cooling wall of a blast furnace hearth comprises a circumferential side wall, a containing space and a high-conductivity graphite brick safety wall, wherein the containing space is arranged in the circumferential side wall; and the furnace bottom is paved on 1 to 7 layers in a layered manner.
As an optimized scheme of the structure of the graphite safety wall built on the hot surface of the cooling wall of the blast furnace hearth, wherein: and a first high-conductivity graphite brick, a microporous carbon brick, a ultramicropore carbon brick and a ceramic pad are sequentially paved at the bottom of the furnace from bottom to top.
As an optimized scheme of the structure of the graphite safety wall built on the hot surface of the cooling wall of the blast furnace hearth, wherein: the ceramic pad comprises a first corundum mullite ceramic pad and a second corundum mullite ceramic pad; the first high-conductivity graphite brick is laid on the 1 st layer, the microporous carbon bricks are laid on the 2 nd, 3 rd and 5 th layers, the ultramicropore carbon bricks are laid on the 4 th layer, and the first corundum mullite ceramic pad and the second corundum mullite ceramic pad are laid on the 6 th and 7 th layers from inside to outside.
As an optimized scheme of the structure of the graphite safety wall built on the hot surface of the cooling wall of the blast furnace hearth, wherein: the accommodating space is located above the furnace bottom, and the high-conductivity graphite brick safety wall is circumferentially laid outside the accommodating space and arranged on the fourth layer to the fourteenth layer.
As an optimized scheme of the structure of the graphite safety wall built on the hot surface of the cooling wall of the blast furnace hearth, wherein: and the high-conductivity graphite brick safety wall is paved with a microporous corundum ceramic cup, an ultramicropore carbon brick and a second high-conductivity graphite brick from inside to outside.
As an optimized scheme of the structure of the graphite safety wall built on the hot surface of the cooling wall of the blast furnace hearth, wherein: the micropore corundum ceramic cup is laid on 6-14 layers of the high-conductivity graphite brick safety wall.
As an optimized scheme of the structure of the graphite safety wall built on the hot surface of the cooling wall of the blast furnace hearth, wherein: and a hearth cooling wall is arranged on the outer side of the circumferential side wall, and a high-heat-conduction ramming material is filled between the ultramicropore carbon brick and the second high-heat-conduction graphite brick.
As an optimized scheme of the structure of the graphite safety wall built on the hot surface of the cooling wall of the blast furnace hearth, wherein: any position outside the high-conductivity graphite brick safety wall is provided with an iron notch, and the iron notch is positioned on the 12 th to 14 th layers.
As an optimized scheme of the structure of the graphite safety wall built on the hot surface of the cooling wall of the blast furnace hearth, wherein: the iron notch is communicated with the accommodating space, corundum castable is poured on the upper side and the lower side of the iron notch, and inlet castable is poured between the second corundum mullite ceramic pad on the furnace bottom and the microporous corundum ceramic cup of the high-conductivity graphite brick safety wall and at the bottom of the first high-conductivity graphite brick on the furnace bottom.
As an optimized scheme of the structure of the graphite safety wall built on the hot surface of the cooling wall of the blast furnace hearth, wherein: and microporous carbon bricks are laid above the high-conductivity graphite brick safety wall.
The utility model has the advantages that: the utility model discloses an increase high graphite brick and build by laying bricks or stones into the safety wall between hearth stave hot side and hearth carbon brick in design of blast furnace hearth and the refractory masonry of hearth, the theory on application intensive cooling formation condensation layer effectively resists "elephant foot shape" erosion of blast furnace hearth lateral wall, reaches the purpose that prolongs the blast furnace life-span, and the graphite brick safety wall of high heat conduction can effectively take precautions against the hearth and burn the accident in addition.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor. Wherein:
FIG. 1 is a view of a first embodiment of a furnace floor and circumferential sidewall configuration combination.
Fig. 2 is a structural view of a side wall where a taphole is located in the second embodiment.
Fig. 3 is a structure diagram of a high-conductivity graphite brick security wall in a second embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying the present invention are described in detail below with reference to the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, the references herein to "one embodiment" or "an embodiment" refer to a particular feature, structure, or characteristic that may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1, in order to provide a first embodiment of the present invention, this embodiment provides a structure for constructing a graphite safety wall on a hot surface of a cooling wall of a blast furnace hearth, which includes a circumferential side wall 100 and a furnace bottom 200, wherein the circumferential side wall 100 is disposed on the upper periphery of the furnace bottom 200; the circumferential side wall 100 includes a high-conductivity graphite brick safety wall 102 and a receiving space 101.
The stove bottom 200 is laid on 1 to 7 layers in layers, specifically, the stove bottom 200 is "circular" and laid on the bottom, from bottom to top, the first high graphite brick 201, the micropore carbon brick 202, the ultramicropore carbon brick 102b and the ceramic pad 204 are laid in layers in sequence, the first high graphite brick 201 is laid on the 1 st layer of the stove bottom, the micropore carbon brick 202 is laid on the 2 nd and 3 rd layers above the first high graphite brick 201, and the laid micropore carbon brick 202 covers the first high graphite brick 201 at the bottom.
Further, the high-conductivity graphite brick safety wall 102 is disposed on the 4 th to 14 th layers, specifically, the high-conductivity graphite brick safety wall 102 is formed by laying a microporous corundum ceramic cup 102a, an ultra-microporous carbon brick 102b and a second high-conductivity graphite brick 102c from inside to outside, the 4 th to 7 th layers coincide with the furnace bottom 200, the 4 th to 7 th layers of the furnace bottom 200 are laid in the middle of the circumference, and the 4 th to 7 th layers of the high-conductivity graphite brick safety wall 102 are disposed on the periphery of the circumference.
Further, the 5 th layer to the 7 th layer of the hearth are respectively composed of the hearth 200 and the high-conductivity graphite brick safety wall 102, specifically, the microporous carbon brick 202 of the hearth 200 is laid in the central area of the 5 th layer, and the ultramicropore carbon brick 102b of the high-conductivity graphite brick safety wall 102 is laid on the outer side; the 6 th layer and the 7 th layer are arranged identically, the ceramic pad 204 of the furnace bottom 200 is laid below the furnace hearth accommodating space 101 from inside to outside, the ceramic pad 204 comprises a first corundum mullite ceramic pad 204a and a second corundum mullite ceramic pad 204b, the first corundum mullite ceramic pad 204a is laid in the central area of the 6 th to 7 th layers of the furnace bottom, and the second corundum mullite ceramic pad 204b is laid in the outer area and abuts against the high-conductivity graphite brick safety wall 102.
Further, 8 to 14 layers of the hearth are provided with a microporous corundum ceramic cup 102a, an ultramicropore carbon brick 102b and a second high-conductivity graphite brick 102c of the high-conductivity graphite brick safety wall 102 from inside to outside, the periphery of the high-conductivity graphite brick safety wall 102 is arranged at the periphery of the hearth, a containing space 101 is enclosed in the center, and in 6 to 7 layers, an inlet castable material 205 is filled between a second corundum mullite ceramic pad 204b and the ultramicropore carbon brick 102b of the high-conductivity graphite brick safety wall 102, so that the second corundum mullite ceramic pad 204b and the high-conductivity graphite brick safety wall 102 are tightly attached to prevent the side wall angle of the inner space of the hearth from being corroded during iron-making production.
Example 2
Referring to fig. 2 and 3, in order to provide a second embodiment of the present invention, the second embodiment is based on the previous embodiment, and a hearth cooling wall 103 is provided outside the furnace bottom 200 and the circumferential side wall 100.
The hearth cooling wall 103 is laid on the first high-conductivity graphite bricks 201 of the furnace bottom 200, the hearth cooling wall 103 is also laid on the outer side of the circumferential side wall 100, and specifically, the second high-conductivity graphite bricks 102c are arranged between the ultra-microporous carbon bricks 102b of the high-conductivity graphite brick safety wall 102 and the hearth cooling wall 103.
Further, an iron notch 104 is arranged at any position on the high-conductivity graphite brick safety wall 102, the iron notch 104 is positioned at the 12 th layer to the 13 th layer of the high-conductivity graphite brick safety wall 102, and the iron notch 104 is communicated with the outer space of the hearth and the accommodating space 101.
Further, the taphole 104 is arranged on the outer side of the high-conductivity graphite brick safety wall 102, corundum castable 104a is poured on the upper side and the lower side of the taphole 104, the high-conductivity graphite brick safety wall 102 on one side of the taphole 104 is laid on the 4 th to 11 th layers, and compared with other high-conductivity graphite brick safety walls 102, the taphole 104 is arranged on the 12 th to 13 th layers.
The circumferential side wall 100 further comprises microporous carbon bricks 202 laid above the high-conductivity graphite brick safety wall 102, hearth cooling walls 103 are also laid outside the microporous carbon bricks 202, a high-conductivity ramming material 105 is filled between the hearth cooling walls 103 and the microporous carbon bricks 202, and similarly, the high-conductivity ramming material 105 is also filled between a second high-conductivity graphite brick 102c and an ultra-microporous carbon brick 102b in the high-conductivity graphite brick safety wall 102.
Further, a high-conductivity graphite brick safety wall 102 is tightly attached to the hearth cooling wall 103, and the thickness is 200 mm; before the high-conductivity graphite brick safety wall 102 is built, the hot surface of the hearth cooling wall 103 is cleaned, all thermocouple short pipes and grouting hole short pipes are cut to be flush with the hot surface of the hearth cooling wall 103, hot high-pressure quartz sand blasting is adopted to remove rust on the surface of the hearth cooling wall 103, and finally a grinding wheel is used for grinding and leveling the hot surface of the hearth cooling wall 103.
Further, the construction of the carbon bricks on the 1 st to 3 rd layers of the furnace bottom 200 is completed, A part of phenolic resin and B part of graphite powder are prepared to be used as a binder, the high-conductivity graphite brick safety wall 102 is constructed by clinging to the hot surface of the furnace hearth cooling wall 103 along the outer ring of the furnace hearth, the gap between the wall brick of the high-conductivity graphite brick safety wall 102 and the furnace hearth cooling wall 103 is required to be within 3mm, the brick is ground when the local staggering of the furnace hearth cooling wall 103 is performed, and the gap is subjected to seam plugging treatment by using a copper sheet when the gap exceeds 3 mm.
In the hearth iron-making process, the edge of the circumferential side wall 100 of the hearth is built into a high-heat-conductivity refractory system by utilizing the good heat conductivity and thermal shock resistance of the high-conductivity graphite brick safety wall 102, the heat of the hearth carbon bricks is rapidly transferred to the cooling wall 103 of the hearth and is taken out of the furnace, the temperature gradient of the circumferential side wall 100 of the hearth is reduced, a stable condensation protective layer is formed on the hot surface of the furnace lining of the circumferential side wall 100 of the hearth, and the foot-shaped erosion of the circumferential side wall 100 of the blast furnace hearth is effectively resisted.
In addition, when the carbon bricks are seriously corroded in the later stage of the blast furnace campaign and the temperature of the circumferential side wall 100 of the hearth is high, the high-heat-conductivity high-conductivity graphite brick safety wall 102 forms an edge condensation layer through enhanced cooling, so that the hearth burnthrough accident is prevented.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or structure steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a structure that graphite safety wall is built by laying bricks or stones to blast furnace hearth cooling wall hot side which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the graphite brick safety wall comprises a circumferential side wall (100) and a safety cover, wherein the circumferential side wall (100) comprises an accommodating space (101) arranged in the circumferential side wall (100) and a high-conductivity graphite brick safety wall (102) arranged on the circumferential side wall (100); and the number of the first and second groups,
the furnace bottom (200) is paved on 1-7 layers in a layered mode.
2. The structure of the graphite safety wall built on the hot surface of the blast furnace hearth cooling wall according to claim 1, characterized in that: and a first high-conductivity graphite brick (201), a microporous carbon brick (202), an ultramicropore carbon brick (102b) and a ceramic pad (204) are sequentially paved on the furnace bottom (200) from bottom to top.
3. The structure of the graphite safety wall built on the hot surface of the blast furnace hearth cooling wall according to claim 2, characterized in that: the ceramic pad (204) comprises a first corundum-mullite ceramic pad (204a) and a second corundum-mullite ceramic pad (204 b);
the first high-conductivity graphite brick (201) is laid on the 1 st layer, the microporous carbon brick (202) is laid on the 2 nd, 3 rd and 5 th layers, the ultramicropore carbon brick (102b) is laid on the 4 th layer, and the first corundum mullite ceramic pad (204a) and the second corundum mullite ceramic pad (204b) are laid on the 6 th and 7 th layers from inside to outside.
4. The structure of the graphite safety wall built on the hot surface of the blast furnace hearth cooling wall according to claim 1, characterized in that: the accommodating space (101) is located above the furnace bottom (200), and the high-conductivity graphite brick safety wall (102) is circumferentially laid outside the accommodating space (101) and arranged on the 4 th to 14 th layers.
5. The structure of the blast furnace hearth cooling wall hot face masonry graphite safety wall according to claim 1 or 4, characterized in that: and the high-conductivity graphite brick safety wall (102) is paved with a microporous corundum ceramic cup (102a), a ultramicropore carbon brick (102b) and a second high-conductivity graphite brick (102c) from inside to outside.
6. The structure of the hot-face masonry of the blast furnace hearth cooling wall according to claim 5, characterized in that: the microporous corundum ceramic cup (102a) is laid on 6-14 layers of the high-conductivity graphite brick safety wall (102).
7. The structure of the hot-face masonry of the blast furnace hearth cooling wall according to claim 6, characterized in that: and a hearth cooling wall (103) is arranged on the outer side of the circumferential side wall (100), and a high-heat-conduction ramming material (105) is filled between the ultramicropore carbon brick (102b) and the second high-heat-conduction graphite brick (102 c).
8. The structure of the hot-face masonry of the blast furnace hearth cooling wall according to claim 5, characterized in that: any position outside the high-conductivity graphite brick safety wall (102) is provided with an iron notch (104), and the iron notch (104) is positioned on the 12 th to 13 th layers.
9. The structure of the hot-face masonry of the blast furnace hearth cooling wall according to claim 8, characterized in that: the iron notch (104) is communicated with the accommodating space (101) and corundum castable (104a) is poured on the upper side and the lower side, and inlet castable (205) is poured between a second corundum mullite ceramic pad (204b) of the furnace bottom (200) and a microporous corundum ceramic cup (102a) of the high-conductivity graphite brick safety wall (102) and at the bottom of a first high-conductivity graphite brick (201) of the furnace bottom (200).
10. The structure of the hot-face masonry graphite safety wall of the blast furnace hearth cooling wall according to claim 9, characterized in that: and microporous carbon bricks (202) are laid above the high-conductivity graphite brick safety wall (102).
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113462834A (en) * | 2021-07-15 | 2021-10-01 | 鞍钢股份有限公司 | Uniform erosion type long-life blast furnace hearth building method |
| CN113736934A (en) * | 2021-08-30 | 2021-12-03 | 上海宝冶冶金工程有限公司 | Construction method for building graphite safety wall of blast furnace body |
| CN114543534A (en) * | 2022-03-16 | 2022-05-27 | 包头钢铁（集团）有限责任公司 | Building method of external wall refractory material of Maerz kiln suspension cylinder |
| CN115386669A (en) * | 2022-08-19 | 2022-11-25 | 山西太钢不锈钢股份有限公司 | Method for establishing triple-hearth structure of blast furnace |
| CN115505665A (en) * | 2022-10-08 | 2022-12-23 | 中冶华天南京工程技术有限公司 | High-efficiency long-life furnace hearth tuyere combined brick |
| CN115612770A (en) * | 2022-11-02 | 2023-01-17 | 本溪北营钢铁（集团）股份有限公司 | Method for prolonging service life of blast furnace hearth |
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2020
- 2020-09-15 CN CN202022032112.9U patent/CN213570558U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113462834A (en) * | 2021-07-15 | 2021-10-01 | 鞍钢股份有限公司 | Uniform erosion type long-life blast furnace hearth building method |
| CN113736934A (en) * | 2021-08-30 | 2021-12-03 | 上海宝冶冶金工程有限公司 | Construction method for building graphite safety wall of blast furnace body |
| CN114543534A (en) * | 2022-03-16 | 2022-05-27 | 包头钢铁（集团）有限责任公司 | Building method of external wall refractory material of Maerz kiln suspension cylinder |
| CN115386669A (en) * | 2022-08-19 | 2022-11-25 | 山西太钢不锈钢股份有限公司 | Method for establishing triple-hearth structure of blast furnace |
| CN115386669B (en) * | 2022-08-19 | 2024-02-02 | 山西太钢不锈钢股份有限公司 | Method for establishing triple hearth structure of blast furnace |
| CN115505665A (en) * | 2022-10-08 | 2022-12-23 | 中冶华天南京工程技术有限公司 | High-efficiency long-life furnace hearth tuyere combined brick |
| CN115612770A (en) * | 2022-11-02 | 2023-01-17 | 本溪北营钢铁（集团）股份有限公司 | Method for prolonging service life of blast furnace hearth |
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