CN113388706A - Composite repair method for blast furnace swinging spout - Google Patents
Composite repair method for blast furnace swinging spout Download PDFInfo
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- CN113388706A CN113388706A CN202010174962.4A CN202010174962A CN113388706A CN 113388706 A CN113388706 A CN 113388706A CN 202010174962 A CN202010174962 A CN 202010174962A CN 113388706 A CN113388706 A CN 113388706A
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- repairing
- spout
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- melting loss
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/14—Discharging devices, e.g. for slag
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Abstract
The invention relates to a composite repair method of a blast furnace swinging spout, which is used for repairing the swinging spout with melting loss and comprises the following steps: s1, determining the repairing time: determining the time when the swing spout needs to be repaired according to the initial thickness and the iron passing amount of the bottom of the swing spout; s2, casting and repairing: carrying out pouring repair operation on the melting loss at the bottom of the swinging spout by using a pouring material to form a new pouring material; s3, peripheral compaction and repair operation: filling a gap between the new material poured and the old material of the swing sliding nozzle in the step S2 by using a compaction repairing material by adopting a peripheral compaction method, and pressing an included angle; s4, spray coating and repairing: and (4) spraying and repairing the side wall melting loss of the swinging spout by using a spraying and repairing material to form a new spraying material. The service life of the swing spout can be effectively prolonged, the iron passing amount of the swing spout is improved, and the use safety and durability of equipment are improved, so that the production cost is effectively reduced.
Description
Technical Field
The invention relates to the field of blast furnace ironmaking, in particular to a composite repairing method of a blast furnace swinging spout.
Background
In the blast furnace ironmaking production process, the swinging spout (also called as swinging) is an essential important device in the ironmaking process, plays a role in molten iron shunting, and shunts the molten iron to torpedo pots or ladles at different positions so as to ensure the continuous operation of tapping. In the production process of the blast furnace, the swinging spout is directly washed by molten iron for a long time, the melting loss and other effects, so that pit-shaped erosion of different degrees is easy to occur at the bottom and the side wall of the swinging spout, and the further improvement of the iron passing amount is limited, as shown in fig. 1 and fig. 2. Generally, when the iron passing amount reaches about 8 ten thousand tons, the swinging spout has the phenomenon of uneven melting loss of each part, particularly obvious pits appear at the bottom, and the residual thickness of the thinnest part is about 11 millimeters. In contrast, the technical measures of repairing the bottom direct spray coating are usually adopted, but the spray coating has small particles, high porosity, low strength and no erosion resistance, and meanwhile, as the spray coating operation is hot, when the spray coating is too thick, the problems of poor air permeability, easy generation of detonation and overall burst are caused, and the aims of prolonging the service life of the swing spout and improving the iron flux of the swing spout cannot be really fulfilled. In this case, the oscillating lip must be replaced as a whole. However, except for the bottom area, other swinging areas do not reach the replacement standard, so that the maintenance cost is increased, resources are wasted, and the potential of energy conservation and emission reduction is not fully excavated.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a composite repair method for a blast furnace swinging nozzle, which can effectively repair the swinging nozzle, has good repair quality, and improves the iron throughput of the swinging nozzle.
In order to achieve the aim, the invention provides a composite repairing method of a blast furnace swinging nozzle, which is used for repairing the swinging nozzle with melting loss and comprises the following steps:
s1, determining the repairing time: determining the time when the swing spout needs to be repaired according to the initial thickness and the iron passing amount of the bottom of the swing spout;
s2, casting and repairing: carrying out pouring repair operation on the melting loss at the bottom of the swinging spout by using a pouring material to form a new pouring material;
s3, peripheral compaction and repair operation: filling a gap between the new material poured and the old material of the swing sliding nozzle in the step S2 by using a compaction repairing material by adopting a peripheral compaction method, and pressing an included angle;
s4, spray coating and repairing: and (4) spraying and repairing the side wall melting loss of the swinging spout by using a spraying and repairing material to form a new spraying material.
Further, in the step S1, when the initial thickness of the bottom of the swing nozzle is 300 mm and the iron passing amount of the swing nozzle reaches 7 to 8.5 ten thousand tons, the optimum repair timing of the swing nozzle is determined.
Further, before the step S2, the inside of the swing nozzle is cleaned.
Further, in step S2, the casting material stirred with water is poured into the bottom melting loss of the swing nozzle to make the casting material uniform and dense, and then baked by a burner to harden the casting material.
Further, in the step S2, the water is added in an amount of 4% to 6% during the process of adding water into the castable and stirring.
Further, in step S2, after the casting repair work, the thickness of the bottom melting loss region of the swing nozzle is returned to the initial thickness.
Further, a circle of melting loss grooves are formed in the side wall of the swinging nozzle at the position of the molten iron surface, and the step S4 includes performing coating and repairing operation on the melting loss grooves.
Further, in step S4, the spray repair work is performed by a shuttle spray method.
Further, the casting material in step S2, the compaction repair material in step S3, and the gunning material in step S4 all mainly contain Al2O3, SiC, and C.
Further, in the step S2, the mass contents of Al2O3, SiC and C in the casting material are 77.26%, 18.71% and 2.23%, respectively; in the step S3, the mass contents of Al2O3, SiC and C in the compacted repair material are 76.32%, 13.76% and 2.15%, respectively; in the step S4, the mass contents of Al2O3, SiC, and C in the casting material are 62.57%, 18.59%, and 2.58%, respectively.
As described above, the composite repair method according to the present invention has the following advantageous effects:
through to bottom melting loss pouring repair work, carry out the compaction repair work to the gap between new material of pouring and the old material of swing swift current mouth, carry out the spraying to the lateral wall melting loss of swing swift current mouth and repair, modify swing swift current mouth comprehensively in different levels, can realize effective reliable repair to swing swift current mouth, repair of high qualityly, can effectively prolong swing swift current mouth life-span, improve the logical iron volume of swing swift current mouth, improved the security and the durability of equipment use to manufacturing cost has been less effectively.
Drawings
FIG. 1 is a schematic view of a new swing spout configuration.
FIG. 2 is a schematic view of a structure of the nozzle when melting loss is formed after use.
Fig. 3 is a schematic diagram of the composite repair method of the present invention.
Description of the element reference numerals
1 swing spout
2 bottom melting loss
3 side wall melting loss
4 pouring of new material
5 compacting and repairing material
6 spray repairing new material
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for convenience of description only, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be regarded as the scope of the present invention without substantial changes in the technical contents.
Referring to fig. 1 to 3, the invention provides a composite repair method for a blast furnace swinging nozzle 1, which is used for repairing the swinging nozzle 1 with melting loss in a blast furnace, and after the newly-input swinging nozzle 1 passes through the iron amount at one end, the bottom melting loss 2 in a pit shape is generated at the bottom position, and the side wall melting loss 3 which is inwards concave is generated on the side walls at two sides. The composite repairing method comprises the following steps:
s1, determining the repairing time: and determining the time when the swing spout 1 needs to be repaired according to the initial thickness and the iron passing amount of the bottom of the swing spout 1. In the present application, the initial bottom thickness of the oscillating nozzle 1 is the bottom thickness of the oscillating nozzle 1 when it is newly introduced. Taking the initial thickness of the bottom of the swing spout 1 as an example of 300 mm, when the iron passing amount of the swing spout 1 reaches 7-8.5 ten thousand tons, the residual thickness of the refractory material at the bottom of the swing spout 1 is measured and calculated to be 110 plus 130 mm, and the optimal repair time of the swing spout 1 is determined, so that the thickness safety coefficient of the bottom of the swing spout 1 can be ensured, the integral tension of the refractory material at the bottom of the swing spout 1 can be ensured, and the scouring resistance inside the swing spout 1 can be improved.
Before the pouring and repairing operation, the swinging spout 1 is cleaned, so that favorable precondition is created for the subsequent repairing operation; specifically, the residual iron, floating ash and the like on the side wall of the swing spout 1 can be removed by using a lifting appliance, a 5-meter-long purging pipe can be manufactured, the swing spout 1 is driven to 18-degree direction to empty the molten iron in the swing spout before the repairing operation is carried out, and then the purging pipe is used for purging the residual molten iron in the swing spout 1 completely, so that the adhesion and the combination degree of the new material and the old material of the swing spout 1 in the direct subsequent repairing operation are facilitated.
S2, casting and repairing: and (3) carrying out pouring repair operation on the bottom melting loss 2 of the swinging spout 1 by using a pouring material to form a new pouring material 4. Specifically, pouring materials stirred by adding water are put into the bottom melting loss 2 of the swinging spout 1, the materials are uniformly and compactly distributed by using a vibrating rod or shaking and the like, and then the materials are baked by using a burner to harden the pouring materials, so that new pouring materials 4 are formed in the bottom melting loss 2. During the process of adding water into the casting material and stirring, the proper water adding amount is determined according to the thermal state condition of the swinging at that time, the water adding amount is preferably controlled to be 4-6%, and 5% is the best, so that good flowing performance is obtained, and segregation caused by excessive water adding is prevented. The main purpose of this operation is to repair the swing bottom erosion 2 portion and to restore the bottom thickness to about 300 mm.
S3, peripheral compaction and repair operation: and (4) filling a gap between the new material 4 poured and the old material of the swing spout 1 in the step S3 by using a peripheral compacting method and using a compacting repair material to press an included angle so as to avoid layering. After casting repair is carried out in the bottom melting loss 2 of the swinging spout 1, because a layering phenomenon can be generated between a new casting material 4 and an old casting material, an iron clamping layer is easy to generate, molten iron can permeate inwards along a repair interface in the tapping process, the two materials of the new casting material 4 and the old casting material are caused to fall off or peel off, and the original structure is damaged. Through the peripheral compaction repairing operation, a new compaction repairing material 5 is formed in a gap between a new pouring material 4 and an old material of the swing spout 1, an included angle is pressed, layering is avoided, and the phenomenon of wind channeling is eliminated.
S4, spray coating and repairing: and (3) spraying and repairing the side wall melting loss 3 of the swinging spout 1 by using a spraying and repairing material to form a new spraying and repairing material. Specifically, the part of the swing nozzle 1 close to the upper edge is a rotary melting loss part of molten iron, the melting loss of peripheral refractory materials is relatively light, the melting loss is gradually deepened from top to bottom, the residual thickness of the refractory materials on the side wall of the swing nozzle 1 is far larger than that of the bottom area, namely the melting loss degree of the side wall 3 is smaller than that of the bottom melting loss 2, and the side wall melting loss 3 is repaired through spraying repair operation so as to restore the thickness of the refractory materials on the side wall when the refractory materials are newly put into the swing nozzle. In addition, when the side wall of the swing spout 1 is tapped, a circle of melting loss grooves are formed in the position of the molten iron surface, and the melting loss grooves are particularly concerned and dealt with during spraying and repairing operation. The spraying and repairing operation preferably adopts reciprocating spraying operation, and the uniform thickness of the side wall refractory material can be ensured. When the hot spray repairing is carried out, the best use potential of the whole refractory material is fully excavated, the explosion is effectively controlled, the swing life is prolonged, and the aim of improving the iron flux is finally achieved.
In the present invention, the casting material in step S2, the caulking material in step S3, and the gunning material in step S4 all mainly contain Al2O3, SiC, and C. Preferably, the composition (mass content) and the physicochemical parameters of the casting material, the compacting and repairing material and the gunning material are as follows:
in the invention, the material of the pouring material of the lower swinging spout is required to have higher purity so as to prevent the material from being over-sintered and keep the thermal shock stability in use, thereby solving the abnormal conditions of cracking, stripping and the like. As seen from the above table, the compacted repairing material has relatively higher strength compared with the casting material, on one hand, the compacted repairing material can ensure sufficient sintering performance, avoid the falling-off between the new repairing material and the mother lining, and simultaneously has stronger impact resistance and scouring resistance. The gunning material is required to have good adhesion, can be used for thermal-state construction, and can be used as the current commonly-used main channel thermal-state gunning material for a large channel of a blast furnace during actual production. Of course, in other embodiments, other materials may be selected for the casting material, the caulking material, and the gunning material, but the main chemical components (such as SiC) should be similar, mainly to enhance the oxidation resistance, high temperature corrosion resistance, and molten iron impact resistance of the refractory.
According to the composite repair method of the blast furnace swinging spout 1, the bottom melting loss 2 is subjected to pouring repair operation, the gap between a new pouring material 4 and an old material of the swinging spout 1 is subjected to compaction repair operation, the side wall melting loss 3 of the swinging spout 1 is subjected to spraying repair, the swinging spout 1 is comprehensively modified in different levels, the swinging spout 1 can be effectively and reliably repaired, the repair quality is good, the service life of the swinging spout 1 can be effectively prolonged, and the iron flux of the swinging spout is increased. Taking the swing spout 1 with the initial bottom thickness of 300 mm as an example, the average iron flux before repair can be increased from about 9 ten thousand tons to 11.5-12 ten thousand tons after repair, and the average iron flux is increased by 2.5-3 ten thousand tons on the original basis, so that the safety and durability of equipment use are improved, and the production cost is effectively reduced.
In conclusion, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A composite repairing method of a blast furnace swinging spout is used for repairing the swinging spout (1) with melting loss, and is characterized in that: the method comprises the following steps:
s1, determining the repairing time: determining the time when the swing spout (1) needs to be repaired according to the initial thickness and the iron passing amount of the bottom of the swing spout (1);
s2, casting and repairing: carrying out pouring repair operation on the bottom melting loss (2) of the swinging spout (1) by using a pouring material to form a new pouring material (4);
s3, peripheral compaction and repair operation: filling a gap between the new material (4) poured and the old material of the swinging spout (1) in the step S2 with a compaction repairing material by adopting a peripheral compaction method, and pressing an included angle;
s4, spray coating and repairing: and (3) spraying and repairing the side wall melting loss (3) of the swinging spout (1) by using a spraying and repairing material to form a new spraying and repairing material.
2. The composite repair method of claim 1, wherein: in the step S1, when the initial thickness of the bottom of the swing nozzle (1) is 300 mm and the iron throughput of the swing nozzle (1) reaches 7 to 8.5 ten thousand tons, the optimum repair time of the swing nozzle (1) is determined.
3. The composite repair method of claim 1, wherein: before the step S2, the interior of the swing spout (1) is cleaned.
4. The composite repair method of claim 1, wherein: in the step S2, the casting material stirred with water is put into the bottom melting loss (2) of the swing nozzle (1) to make the casting material uniform and dense, and then baked by a burner to make the casting material hard.
5. The composite repair method of claim 4, wherein: in the step S2, the water adding amount is 4-6% in the process of adding water into the castable and stirring.
6. The composite repair method of claim 1, wherein: in step S2, after the casting repair work, the thickness of the bottom melting loss (2) region of the swing nozzle (1) returns to the initial thickness.
7. The composite repair method of claim 1, wherein: and a circle of melting loss grooves are formed in the side wall of the swinging spout (1) at the position of the molten iron surface, and the step S4 comprises the step of spraying the melting loss grooves for coating and repairing.
8. The composite repair method of claim 1, wherein: in step S4, the spray repair operation is performed by a reciprocating spray method.
9. The composite repair method of claim 1, wherein: the casting material in the step S2, the compaction repair material in the step S3, and the gunning material in the step S4 all mainly contain Al2O3SiC and C.
10. The composite repair method of claim 9, wherein: in the step S2, Al in the casting material2O3The mass contents of SiC and C are 77.26%, 18.71% and 2.23% respectively; in the step S3, Al in the patching material is compacted2O3The mass contents of SiC and C are 76.32%, 13.76% and 2.15% respectively; in the step S4, Al in the casting material2O3SiC and C were 62 mass contents, respectively57%, 18.59% and 2.58%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010174962.4A CN113388706B (en) | 2020-03-13 | 2020-03-13 | Composite repair method for blast furnace swinging chute nozzle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010174962.4A CN113388706B (en) | 2020-03-13 | 2020-03-13 | Composite repair method for blast furnace swinging chute nozzle |
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| CN113388706A true CN113388706A (en) | 2021-09-14 |
| CN113388706B CN113388706B (en) | 2022-11-01 |
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Citations (7)
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| JP2001220611A (en) * | 2000-02-02 | 2001-08-14 | Sankyu Inc | Method for repairing inside surface refractory of gas capturing mantel |
| KR20050025467A (en) * | 2003-09-08 | 2005-03-14 | 주식회사 포스코 | Skimmer dam for repairing main runner of a blaster furnace |
| CN101705326A (en) * | 2009-11-05 | 2010-05-12 | 新兴铸管股份有限公司 | Repair method of mixer furnace |
| CN102839247A (en) * | 2012-09-27 | 2012-12-26 | 鞍钢股份有限公司 | Method for improving service life of iron-storage main iron runner |
| CN103073311A (en) * | 2013-01-21 | 2013-05-01 | 东海县盛昌石英材料有限公司 | Fast fill pouring material for working lining of swinging chute and preparation method of material thereof |
| CN204602467U (en) * | 2015-04-28 | 2015-09-02 | 宣化钢铁集团有限责任公司 | For repairing the flush coater of adjustable online oscillating chute castable defect |
| CN107858480A (en) * | 2017-12-25 | 2018-03-30 | 马鞍山钢铁股份有限公司 | A kind of converter taphole restorative procedure |
-
2020
- 2020-03-13 CN CN202010174962.4A patent/CN113388706B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001220611A (en) * | 2000-02-02 | 2001-08-14 | Sankyu Inc | Method for repairing inside surface refractory of gas capturing mantel |
| KR20050025467A (en) * | 2003-09-08 | 2005-03-14 | 주식회사 포스코 | Skimmer dam for repairing main runner of a blaster furnace |
| CN101705326A (en) * | 2009-11-05 | 2010-05-12 | 新兴铸管股份有限公司 | Repair method of mixer furnace |
| CN102839247A (en) * | 2012-09-27 | 2012-12-26 | 鞍钢股份有限公司 | Method for improving service life of iron-storage main iron runner |
| CN103073311A (en) * | 2013-01-21 | 2013-05-01 | 东海县盛昌石英材料有限公司 | Fast fill pouring material for working lining of swinging chute and preparation method of material thereof |
| CN204602467U (en) * | 2015-04-28 | 2015-09-02 | 宣化钢铁集团有限责任公司 | For repairing the flush coater of adjustable online oscillating chute castable defect |
| CN107858480A (en) * | 2017-12-25 | 2018-03-30 | 马鞍山钢铁股份有限公司 | A kind of converter taphole restorative procedure |
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