CN114058753A - Partitioning method for refractory material of main channel working layer of large blast furnace casting house - Google Patents
Partitioning method for refractory material of main channel working layer of large blast furnace casting house Download PDFInfo
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- CN114058753A CN114058753A CN202011511583.6A CN202011511583A CN114058753A CN 114058753 A CN114058753 A CN 114058753A CN 202011511583 A CN202011511583 A CN 202011511583A CN 114058753 A CN114058753 A CN 114058753A
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- iron
- slag
- area
- blast furnace
- main channel
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- 239000011819 refractory material Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000000638 solvent extraction Methods 0.000 title claims abstract description 12
- 238000005266 casting Methods 0.000 title claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 211
- 229910052742 iron Inorganic materials 0.000 claims abstract description 108
- 239000002893 slag Substances 0.000 claims abstract description 80
- 238000010079 rubber tapping Methods 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000005192 partition Methods 0.000 claims abstract description 15
- 238000010276 construction Methods 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000013316 zoning Methods 0.000 description 1
Images
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/04—Blast furnaces with special refractories
Abstract
The invention discloses a partitioning method for a refractory material of a main channel working layer of a large blast furnace cast house, relating to the technical field of iron-making blast furnaces. According to the method, the working layer of the main channel of the large blast furnace cast house is partitioned, so that a proper refractory material is conveniently selected for each partition, the problem of corrosion of the mixed liquid of the iron slag on the working layer of the main channel in a cast state is solved, the service life of the main channel of the large blast furnace is prolonged due to reasonable partition materials, and the cost of the refractory material is reduced; and data support is provided for the later maintenance work of the slag discharge hole and the tapping hole of the iron runner, so that safety and quality accidents are avoided.
Description
Technical Field
The invention relates to the technical field of iron-making blast furnaces, in particular to a partitioning method for a refractory material of a main channel working layer of a large-scale blast furnace cast house.
Background
At present, the iron-making blast furnace is developed towards large-scale, high-efficiency and automatic production for eliminating the backward capacity. After the blast furnace is large-sized, the tapping quantity is large, the flow speed is high, the scouring force and the abrasion of molten iron and slag are increased, the working conditions of the main iron runner are increasingly severe, and the service life is shortened. The material distribution of the casting material is therefore also different.
At present, the material used in the working layer of the main channel of the domestic large-scale blast furnace is mainly divided into a slag zone and an iron zone. The molten iron flows out from the iron outlet, the iron slag floats upwards under the influence of the density of the molten iron, the molten iron sinks, and two layers are formed in the iron runner. When the main channel refractory material is partitioned, the upper part adopts slag line materials resistant to slag corrosion, and the lower part adopts iron line materials resistant to iron corrosion. The conventional zoning and the theoretical erosion of refractory are shown in fig. 1.
The prior art has the defect that when molten iron flows out of an iron notch, an iron slag mixed liquid is formed in a main iron runner due to the falling impact force of the molten iron. The static level is only established when no iron is tapped. Therefore, when tapping, the working layer of the main channel can be corroded by iron, iron slag and slag together, and the two-layer partition method cannot meet the tapping environment requirement, so that the service life of the refractory material is short.
Disclosure of Invention
The invention aims to provide a partitioning method for a refractory material of a main channel working layer of a large-scale blast furnace cast house, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a partition method of a refractory material of a main channel working layer of a large blast furnace casting house divides the main channel working layer into four partitions, namely an air zone, a slag zone and an iron zone, wherein the uppermost layer of the main channel working layer is the air zone, the air zone is the slag zone downwards, the slag zone is the slag zone downwards, and the slag zone is the iron zone downwards.
As a further scheme of the invention: the method comprises the following steps:
1) determining an air zone: determining the liquid level of the iron slag in a tapping state according to the tapping quantity and the flow rate of each blast furnace, wherein the liquid level of the iron slag is exposed in the air, and an air zone is arranged above the liquid level of the iron slag;
2) determining the design construction depth of a slag discharge hole and the depth of a tapping hole of a casting runner;
3) calculating the heights of the iron slag and the molten iron in the main iron runner according to the slag-iron ratio, the molten iron density and the iron slag density of the large blast furnace tapping;
4) determining a slag iron area: the height of the upper liquid level of the slag iron zone is 50-100mm below the designed construction depth of the slag discharge hole in the step 2), and the height of the lower liquid level of the slag iron zone is 200mm below the depth of the iron tap hole of the iron runner in the step 2);
5) determining a slag area: a slag zone is arranged between the upper surface of the iron slag zone in the step 4) and the lower surface of the air zone in the step 1);
6) determining an iron area: and 4) an iron area is formed between the lower surface of the iron slag area and the bottom of the ditch.
As a still further scheme of the invention: the height of the air zone is 100-180 mm.
As a still further scheme of the invention: the air zone is made of an antioxidant material.
As a still further scheme of the invention: the slag zone is made of slag line material.
As a still further scheme of the invention: the iron area is made of iron wire materials.
As a still further scheme of the invention: the iron slag zone is made of iron dropping point materials.
Compared with the prior art, the invention has the following beneficial effects:
1. the problem of corrosion of the mixed liquid of the iron slag on the working layer of the main channel in the tapping state is solved;
2. reasonable material consumption in different areas enables the service life of the main channel of the large blast furnace to be prolonged, and the cost of refractory materials to be reduced;
3. and data support is provided for the later maintenance work of the slag discharge hole and the tapping hole of the iron runner, so that safety and quality accidents are avoided.
Drawings
FIG. 1 is a sectional view of a conventional main runner.
Fig. 2 is a schematic longitudinal sectional view of a main groove partition according to an embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view of a main trench partition according to an embodiment of the present invention.
FIG. 4 is a schematic diagram of the position of the iron slag when the iron hook is not discharged.
FIG. 5 is a schematic view of the position of the slag iron during the iron hook tapping in the embodiment of the present invention.
FIG. 6 is a schematic view of the blast furnace main iron runner area division according to the embodiment of the present invention.
FIG. 7 is a schematic diagram of the operation of the embodiment of the present invention in a non-tapping state.
FIG. 8 is a schematic view of the operation of the embodiment of the present invention in the tapping state.
Detailed Description
The present invention will be described in detail with reference to the following embodiments, wherein like or similar elements are designated by like reference numerals throughout the several views, and wherein the shape, thickness or height of the various elements may be expanded or reduced in practice. The examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention. Any obvious modifications or variations can be made to the present invention without departing from the spirit or scope of the present invention.
Example of the invention
Referring to fig. 2-3, the liquid level in the main channel is different in different tapping states, the liquid level rises during tapping, and the liquid level is static when tapping is not performed; referring to fig. 4, in the four zones formed in the main trough in the tapping state, the refractory material of the main trough is eroded and washed by different mediums;
therefore, referring to fig. 1 to 6, in the embodiment of the present invention, a method for partitioning a refractory material in a main runner working layer of a large-scale blast furnace cast house is divided into four partitions, namely an air partition, a slag partition, an iron slag partition and an iron partition, according to the using environment and conditions of the main runner working layer. The reason is that the upper part of the main channel with the height of 100-180mm is not contacted with molten iron or iron slag, and the main channel is divided into separate areas, wherein the iron slag is arranged below the air area, the slag area is arranged below the first layer of the air area, the iron slag mixing area is arranged below the slag area, and the iron area is arranged at the lowest edge of the slag area.
The specific partitioning method comprises the following steps:
1) determining the liquid level of the iron slag in the iron tapping state according to the iron tapping amount and the flow rate of each blast furnace, wherein the liquid level is not in contact with the iron slag and is directly exposed in the air, and the height of an air zone of the large blast furnace is generally 180 mm;
2) determining the design construction depth of a slag discharge opening as A and the depth of a tapping hole of the iron runner as B. The dimensions a and B are constantly getting larger due to normal erosion during use.
3) And calculating the heights of the iron slag and the molten iron in the main iron runner according to the slag-iron ratio (the national average slag ratio is about 0.25-0.4) of the large blast furnace tapping, the molten iron density and the iron slag density.
4) The height of the upper liquid level of the iron slag zone is between 50 and 100mm from the bottom A, and the height of the lower liquid level is between 100 and 200mm from the bottom B;
5) only the iron slag part is contacted between the iron slag zone and the air zone to form a slag zone;
6) the part from the liquid level below the iron slag area to the bottom of the ditch, which is only contacted with the molten iron, is an iron area.
The main runner working layer of the large-scale blast furnace casting house is partitioned by the method, so that a proper refractory material is convenient to select for each partition, the problem of corrosion of the molten iron slag mixed liquid to the main runner working layer in a casting state is solved, data support is provided for later maintenance work of the slag discharge hole and the casting runner casting hole, and safety and quality accidents are avoided.
Referring to fig. 7 to 8, different materials are selected according to the four sub-areas, so that the service life of the main channel is prolonged, and the iron flux is increased; preferably, the air zone is made of an antioxidant material; the slag zone is made of slag line materials; the iron slag zone is made of iron falling point materials; the iron area is made of iron wire materials; reasonable material consumption in different areas can prolong the service life of the main channel of the large blast furnace and reduce the cost of refractory materials.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A partition method for a refractory material of a main channel working layer of a large blast furnace casting house is characterized in that the main channel working layer is divided into four partitions, namely an air area, a slag-iron area and an iron area, wherein the uppermost layer of the main channel working layer is the air area, the air area is the slag area downwards, the slag area is the slag-iron area downwards, and the slag area is the iron area downwards.
2. The method for partitioning the refractory material of the working layer of the main channel of the large-scale blast furnace cast house according to claim 1, comprising the steps of:
1) determining an air zone: determining the liquid level of the iron slag in a tapping state according to the tapping quantity and the flow rate of each blast furnace, wherein the liquid level of the iron slag is exposed in the air, and an air zone is arranged above the liquid level of the iron slag;
2) determining the design construction depth of a slag discharge hole and the depth of a tapping hole of a casting runner;
3) calculating the heights of the iron slag and the molten iron in the main iron runner according to the slag-iron ratio, the molten iron density and the iron slag density of the large blast furnace tapping;
4) determining a slag iron area: the height of the upper liquid level of the slag iron zone is 50-100mm below the designed construction depth of the slag discharge hole in the step 2), and the height of the lower liquid level of the slag iron zone is 200mm below the depth of the iron tap hole of the iron runner in the step 2);
5) determining a slag area: a slag zone is arranged between the upper surface of the iron slag zone in the step 4) and the lower surface of the air zone in the step 1);
6) determining an iron area: and 4) an iron area is formed between the lower surface of the iron slag area and the bottom of the ditch.
3. The method as claimed in claim 2, wherein the height of the air zone is 100-180 mm.
4. The method for partitioning the refractory material of the working layer of the main channel of the large-scale blast furnace cast house according to any one of claims 1 to 3, wherein the air zone is made of an oxidation resistant material.
5. The method for partitioning the refractory material of the working layer of the main runner of the large-scale blast furnace cast house according to any one of claims 1 to 3, wherein the slag zone is made of slag line material.
6. The method for partitioning the refractory material of the working layer of the main channel of the large-scale blast furnace cast house according to claim 5, wherein the iron area is made of iron wire materials.
7. The method for partitioning the refractory material of the working layer of the main channel of the large-scale blast furnace cast house according to claim 6, wherein the iron slag zone is made of iron dropping point materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011511583.6A CN114058753A (en) | 2020-12-18 | 2020-12-18 | Partitioning method for refractory material of main channel working layer of large blast furnace casting house |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011511583.6A CN114058753A (en) | 2020-12-18 | 2020-12-18 | Partitioning method for refractory material of main channel working layer of large blast furnace casting house |
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| CN114058753A true CN114058753A (en) | 2022-02-18 |
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| CN202011511583.6A Pending CN114058753A (en) | 2020-12-18 | 2020-12-18 | Partitioning method for refractory material of main channel working layer of large blast furnace casting house |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116083670A (en) * | 2022-12-30 | 2023-05-09 | 北京联合荣大工程材料股份有限公司 | Prefabricated part for hot repair of iron runner and construction method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08246013A (en) * | 1995-03-09 | 1996-09-24 | Nippon Steel Corp | Method for suppressing local erosion of refractories |
| JP2003049212A (en) * | 2001-08-07 | 2003-02-21 | Sumitomo Metal Ind Ltd | Structure of main trough in blast furnace |
| JP2003268426A (en) * | 2002-03-13 | 2003-09-25 | Taiko Rozai Kk | Lining for tapping flume of blast furnace, and forming method therefor |
| CN201873697U (en) * | 2010-11-26 | 2011-06-22 | 武汉钢铁(集团)公司 | Novel blast furnace tapping channel |
| CN201873698U (en) * | 2010-11-26 | 2011-06-22 | 武汉钢铁(集团)公司 | Iron runner for blast-furnace casting |
| CN107140958A (en) * | 2017-06-05 | 2017-09-08 | 武汉钢铁有限公司 | Composite carbon fiber reinforcement pouring material for iron tap channel subregion and preparation method thereof |
-
2020
- 2020-12-18 CN CN202011511583.6A patent/CN114058753A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08246013A (en) * | 1995-03-09 | 1996-09-24 | Nippon Steel Corp | Method for suppressing local erosion of refractories |
| JP2003049212A (en) * | 2001-08-07 | 2003-02-21 | Sumitomo Metal Ind Ltd | Structure of main trough in blast furnace |
| JP2003268426A (en) * | 2002-03-13 | 2003-09-25 | Taiko Rozai Kk | Lining for tapping flume of blast furnace, and forming method therefor |
| CN201873697U (en) * | 2010-11-26 | 2011-06-22 | 武汉钢铁(集团)公司 | Novel blast furnace tapping channel |
| CN201873698U (en) * | 2010-11-26 | 2011-06-22 | 武汉钢铁(集团)公司 | Iron runner for blast-furnace casting |
| CN107140958A (en) * | 2017-06-05 | 2017-09-08 | 武汉钢铁有限公司 | Composite carbon fiber reinforcement pouring material for iron tap channel subregion and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116083670A (en) * | 2022-12-30 | 2023-05-09 | 北京联合荣大工程材料股份有限公司 | Prefabricated part for hot repair of iron runner and construction method thereof |
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Application publication date: 20220218 |
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