CN115652004B - Compacting method for blast furnace tap hole channel - Google Patents
Compacting method for blast furnace tap hole channel Download PDFInfo
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- CN115652004B CN115652004B CN202211297426.9A CN202211297426A CN115652004B CN 115652004 B CN115652004 B CN 115652004B CN 202211297426 A CN202211297426 A CN 202211297426A CN 115652004 B CN115652004 B CN 115652004B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 114
- 238000010009 beating Methods 0.000 claims abstract description 73
- 229910052742 iron Inorganic materials 0.000 claims abstract description 57
- 238000010079 rubber tapping Methods 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 239000002893 slag Substances 0.000 claims abstract description 12
- 238000012797 qualification Methods 0.000 claims abstract description 8
- 238000005516 engineering process Methods 0.000 claims abstract description 4
- 230000000903 blocking effect Effects 0.000 claims abstract 2
- 239000000571 coke Substances 0.000 claims description 6
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 5
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 claims description 5
- 239000010426 asphalt Substances 0.000 claims description 5
- 239000004927 clay Substances 0.000 claims description 5
- 229910052593 corundum Inorganic materials 0.000 claims description 5
- 239000010431 corundum Substances 0.000 claims description 5
- 239000010443 kyanite Substances 0.000 claims description 5
- 229910052850 kyanite Inorganic materials 0.000 claims description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 5
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 5
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 5
- 229910000734 martensite Inorganic materials 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 230000002028 premature Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000013016 damping Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000012840 feeding operation Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Manufacture Of Iron (AREA)
Abstract
The invention belongs to the technical field of blast furnace ironmaking, and particularly relates to a compacting method of a blast furnace taphole channel. The method comprises the following steps: (1) According to the invention, anhydrous stemming is adopted, and tar with the mass fraction of 19-19.5% is added, when the pass rate of a tap hole is reduced by 5%, and the tap hole is seriously splashed when an opening and a blocking tap hole are opened, the tar is controlled to be 19.5%, and the control lower limit of a Marxian value is 0.4MPa; (2) The drill bit is adjusted according to the pressure in the furnace by adopting the drill bit application technology, so that a horn mouth with large outside and small inside is formed; (3) And (3) after the blast furnace is completely discharged with the iron slag, carrying out mud beating for 3-4 times, and strictly controlling the mud amount, pressure and interval time according to the furnace inlet air quantity. The method improves the qualification rate of the tap hole, reduces the leakage, breakage and premature splashing of the tap hole, maintains the sufficient tap hole depth, prolongs the tapping time, and creates favorable conditions for stable production and smooth running of the blast furnace and complete slag iron discharge.
Description
Technical Field
The invention belongs to the technical field of blast furnace ironmaking, and particularly relates to a compacting method of a blast furnace taphole channel.
Background
The blast furnace tapping hole is a channel for slag iron to flow out continuously, and the working state of the blast furnace tapping hole not only affects the yield and the smooth operation, but also is of great importance to the safety of a hearth and the service life of the blast furnace. The flatness of the tap hole channel determines whether tapping is smooth or not, the diameter influences tapping speed, and the depth determines whether slag iron is discharged completely or not. Because the iron notch is continuously flushed by high-temperature slag iron, the working environment near the iron notch is extremely bad, and daily maintenance work also becomes an important task of a production organization.
With the continuous development of the steel industry, the blast furnace smelting gradually tends to be large-scale, and the furnace is internally provided with a plurality of steel-iron alloy materialsThe pressure is continuously increased, the tapping frequency is gradually increased, and higher requirements are put on the maintenance of a tapping hole in front of the furnace. For 5000m 3 The large blast furnace has large hearth diameter, easy accumulation of the center and poor molten iron circulation and hearth activity. The phenomena of oxygen burning at the iron notch, stewing and blasting are gradually increased, the iron notch channel is destroyed, the abnormalities such as splashing, coke blockage, short tapping time, slag iron holding and the like are easily caused, and how to reasonably and efficiently compact and lubricate the iron notch channel becomes an important subject.
Through searching, patent CN201410009285.5 discloses a method for grouting a tap hole of a blast furnace, in order to prevent molten iron from splashing, a tapping machine is used for drilling a hole with a depth of 2.8-3.2 m, and then grouting operation is carried out on the tap hole. Patent CN111778375a discloses a maintenance method for a taphole of an ouye furnace, the patent adopts oxygen feeding operation above the taphole, oxygen burning seriously damages the integrity of a taphole mud sleeve, and mud is beaten in four sections, each time is 10 seconds, the mud beating amount is 40L, the mud beating amount for the first time is small, the later mud supplementing amount is large, stable mud bags are difficult to form, the interval time is short, and enough coking time is not available.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a compacting method of a blast furnace tap hole channel. The invention improves the qualification rate of the tap hole from three angles of adjusting the ratio of tar, sleeving the drill bit and beating mud at intervals in sections, reduces the leakage, breakage and premature splashing of the tap hole, maintains enough tap hole depth, prolongs tapping time, and creates favorable conditions for stable production and smooth running of the blast furnace and complete slag iron discharge.
In order to achieve the above effects, the invention provides a compacting method of a blast furnace tap hole channel, comprising the following steps:
the invention adopts anhydrous stemming, and the preferable formula (wt%) is: 20% of silicon carbide, 15% of coke, 25% of brown corundum, 15% of clay, 10% of silicon nitride iron, 5% of sericite, 6% of kyanite, 4% of asphalt, 19-19.5% of additional tar, and stable Martensitic value between 0.4 and 0.5MPa (at 80 ℃). The tar was controlled to 19% during normal production, and the flexural strength was controlled to 5KPa. When the service time of the taphole is long, the qualification rate of the taphole is reduced by 5%, and when the taphole is severely splashed when the taphole is opened and blocked, the tar is controlled to be 19.5%, and the lower limit of a Ma Xia value is controlled to be 0.4MPa, so that the breaking strength (4.5 MPa) of stemming is reduced, the stemming is softer, and the compactness of the pores of a taphole channel is enhanced.
The iron notch adopts the drill bit application technology, when the hot air pressure is more than 450KPa, firstly, phi 65mm is used, the opening depth is 3-3.1 m, and then, a drill bit with the diameter of phi 62.5mm is used; when the hot air pressure is 450-445 KPa, firstly using phi 62.5mm, the opening depth is 2.9-3 m, and then replacing a phi 60mm drill; when the hot air pressure is less than 445KPa, a single phi 60mm drill bit is used to open. By adopting the technical scheme, the purpose is to form the horn mouth tapping model.
When the iron slag is discharged completely, the difference between the theoretical iron amount and the actual iron amount is less than 10 tons, the first plugging and the mud pumping are carried out, the mud pumping amount is 280-350 kg, and the pressure is 24.5-25.5 MKPa; after 3min of interval, the second mud beating is carried out, the mud beating amount is 15kg, and the pressure is 25.5-26 MKPa. And (3) carrying out third mud beating after 1min interval, wherein the mud beating amount is 5kg, and the mud beating pressure is 26-26.5 MKPa.
The scheme is further improved, the first mud beating amount is determined according to the specific furnace inlet air quantity, and when the air quantity is less than or equal to 6800m 3 At/min, controlling the mud amount to be 280kg; when the air quantity is 6800-7000 m 3 Controlling the mud beating amount to 320kg in a minute; when the air quantity is 7000-7200 m 3 Controlling the mud beating amount in a period of time of/min to be 340kg; when the air quantity is more than or equal to 7200m 3 The mud beating amount is controlled to be 350kg in per minute.
According to the scheme, if the average tapping time of the iron notch is reduced by more than 5min, the fourth mud beating is added after the interval of 1min after the third mud beating, the mud beating amount is controlled to be 5kg, and the mud beating pressure is 26.5-27 MKPA.
According to the scheme, the method is further improved, during normal production, the depth of a tap hole is controlled to be 37-3.8 m, when the depth of the tap hole exceeds the upper limit, the first mud beating amount is reduced by 20kg, and after the depth of the tap hole reaches the normal range, the first mud beating amount is gradually increased by four times, and each time is increased by 5kg; when the depth of the iron notch is lower than the lower limit, 15kg of the first mud beating amount is increased, and after the depth of the iron notch reaches the normal range, the first mud beating amount is gradually reduced by three times, and 5kg of the first mud beating amount is reduced each time.
The invention has the beneficial effects that:
(1) In the traditional tap hole plugging method, single stemming components are mostly adopted, and a single drill bit is used for opening. The method adjusts the tar ratio according to the state of the iron notch, controls the flexural strength and ensures the plasticity of stemming. The drill bit is adjusted according to the pressure in the furnace by adopting the drill bit application technology. Can ensure that the tapping system is continuously adjusted along with smelting intensity, furnace condition change and other factors, and avoid furnace condition fluctuation caused by slag-holding iron.
(2) The pressure maintaining time is prolonged by sectional mud beating, mud beating is carried out for 3-4 times after the slag iron is discharged from the blast furnace, and the mud quantity, pressure and interval time are strictly controlled according to the furnace inlet air quantity. Through the mud filling pressurize, the gap in the effective filling taphole passageway, closely knit and repair the taphole passageway, the effectual taphole splash that has prevented, taphole cluster coal gas, extension tapping time.
(3) Through the segmentation mud of beating, can the inside balling of effectual increase taphole, guaranteed the taphole degree of depth, reduced the erosion of high temperature slag iron in the stove to the regional cooling wall of taphole, be favorable to the high yield and the life of blast furnace.
(4) The invention can greatly improve the qualification rate of the tap hole, reduce abnormal phenomena such as leakage, breakage, premature splashing and the like of the tap hole, and prolong the tapping time.
(5) For compacting the tap hole channel, the traditional method adopts tap hole grouting mostly, grouting operation needs special grouting equipment, drilling is needed before operation, and operation is complex. More importantly, the grouting operation time is long, and the grouting operation needs to be carried out when the blast furnace is in damping down and overhauling, so that the normal tapping of the blast furnace is affected. Especially for 5000m 3 The large-scale blast furnace of level, the output is high, and the damping down rate is low, and the tap hole pressure is big, hardly runs into the maintenance time.
The invention makes up the defect of maintenance of the traditional iron notch, has simple operation, does not need special equipment, can be operated in daily production, and does not need to stop the furnace. Effectively meet 5000m 3 The blast furnace above the level has the characteristics of high yield and low damping down rate. The invention changes the original one-time mud beating into 3-4 times mud beating based on the normal plugging operation of the blast furnace, and has no normal production operationHas large difference, does not delay normal production, and has obvious effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic view of a tap hole in embodiment 2 of the present invention, and a is the tap hole depth.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1:
the compacting method of the blast furnace tap hole channel comprises the following steps:
firstly, selecting anhydrous foamed mud, wherein the formula (wt%) is as follows: 20% of silicon carbide, 15% of coke, 25% of brown corundum, 15% of clay, 10% of silicon nitride iron, 5% of sericite, 6% of kyanite, 4% of asphalt, and 19-19.5% of tar by mass, wherein the Marshall value is stabilized between 0.4 and 0.5MPa (at 80 ℃).
When the production is normal, the tar content is 19%, and the perfection strength reaches 5KPa; when the iron notch slightly fluctuates and the proportion of tar is gradually increased, the qualification rate of the iron notch is reduced by 5 percent, and when the iron notch is seriously splashed when the iron notch is opened and blocked, the tar is controlled at 19.5 percent, the lower limit of the control of the Martensitic value is 0.4MPa, and the folding strength is 4.5MPa.
And secondly, adjusting the drill bit according to the hot air pressure, specifically adopting different drill bits according to the hot air pressure, and firstly using a large-caliber drill bit and then using a small-aperture drill bit when using the double drill bits to form a horn mouth with large outside and small inside.
Specifically, when the hot air pressure is more than 450KPa, firstly using phi 65mm, the opening depth is 3-3.1 m, and then replacing a phi 62.5mm drill; when the hot air pressure is 450-445 KPa, firstly using phi 62.5mm, the opening depth is 2.9-3 m, and then replacing a phi 60mm drill. When the hot air pressure is less than 445KPa, a single phi 60mm drill bit is used to open.
Thirdly, the tap hole is subjected to sectional mud beating and pressure maintaining.
When the iron slag is discharged completely, when the difference between the theoretical iron amount and the actual iron amount is less than 10 tons, performing primary mud beating: the first mud beating amount is 280kg to 350kg, and the pressure is 24.5 MKPa to 25.5MKPa; 15kg of mud is pumped for the second time, and the pressure is 25.5-26 MKP; the third mud beating amount is 5kg, and the mud beating pressure is 26-26.5 MKPa.
For the first mud beating, when the air quantity is less than or equal to 6800m 3 At/min, controlling the mud amount to be 280kg; when the air quantity is 6800-7000 m 3 Controlling the mud beating amount to 320kg in a minute; when the air quantity is 7000-7200 m 3 Controlling the mud beating amount in a period of time of/min to be 340kg; when the air quantity is more than or equal to 7200m 3 The mud beating amount is controlled to be 350kg in per minute.
After 3min, performing secondary mud beating, wherein the mud beating amount is 15kg, and the pressure is 25.5-26 MKPa.
After 3min, performing secondary mud beating, wherein the mud beating amount is 15kg, and the pressure is 25.5-26 MKPa.
And (3) carrying out third mud beating for 1min, wherein the mud beating amount is 5kg, and the mud beating pressure is 26-26.5 MKPa.
If the average tapping time of the tap hole is reduced by more than 5min, adding fourth mud beating after 1min interval, and controlling the mud beating amount at 5kg and the mud beating pressure at 26.5-27 MKPa.
During normal production, the depth of the iron notch is controlled to be 37-3.8 m, when the depth of the iron notch exceeds the upper limit, the first mud beating amount is reduced by 20kg, and after the depth of the iron notch reaches the normal range, the first mud beating amount is gradually increased by four times, and 5kg is added each time; when the depth of the iron notch is lower than the lower limit, 15kg of the first mud beating amount is increased, and after the depth of the iron notch reaches the normal range, the first mud beating amount is gradually reduced by three times, and 5kg of the first mud beating amount is reduced each time.
Example 2
The method for compacting the tap hole channel of the blast furnace will be described in detail with reference to specific examples.
In the method for compacting the tap hole channel in the embodiment, a foam mud formula (wt%) is adopted: 20% of silicon carbide, 15% of coke, 25% of brown corundum, 15% of clay, 10% of silicon nitride iron, 5% of sericite, 6% of kyanite, 4% of asphalt, 19.2% of additional tar, and stable values of Marxia at 0.43MPa (at 80 ℃); applying a drill bit, wherein the opening depth of phi 65mm is 3-3.1 m, and then replacing the drill bit with phi 62.5 mm; 285kg of mud is beaten for the first time, the pressure is 24.7MKPa, the interval is 3min, 15kg of mud is beaten for the second time, the pressure is 25.6MKPa, the interval is 1min, the mud is beaten for the third time, the mud beating amount is 5kg, and the pressure is 26MKPa.
Through the adjustment, the qualification rate of the iron notch is increased by 4.7 percent.
Example 3
In the method for compacting the tap hole channel in the embodiment, a foam mud formula (wt%) is adopted: 20% of silicon carbide, 15% of coke, 25% of brown corundum, 15% of clay, 10% of silicon nitride iron, 5% of sericite, 6% of kyanite, 4% of asphalt, 19.5% of additional tar, and stable values of Marxia at 0.4MPa (at 80 ℃); applying a drill bit, wherein the opening depth of phi 62.5mm is 3-3.1 m, and then replacing the drill bit with phi 60 mm; 290kg of mud is beaten for the first time, the pressure is 25.5MKPa, the interval is 3min, 15kg of mud is beaten for the second time, the pressure is 25.9MKPa, the interval is 1min, the mud is beaten for the third time, the mud beating amount is 5.5kg, the pressure is 26.6MKPa, the interval is 1min, the mud is beaten for the fourth time, the mud beating amount is 5kg, and the pressure is 26.9MKPa.
Through the adjustment, the qualification rate of the iron notch is increased by 10.8 percent.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (3)
1. A method for compacting a tap hole channel of a blast furnace, the method comprising the steps of:
(1) Adopting anhydrous stemming, adding 19-19.5% of tar by mass percent, and stabilizing the Martensitic value between 0.4 and 0.5 MPa; the anhydrous stemming comprises the following components in percentage by mass: 20% of silicon carbide, 15% of coke, 25% of brown corundum, 15% of clay, 10% of silicon nitride iron, 5% of sericite, 6% of kyanite and 4% of asphalt;
the mass fraction of tar is controlled to be 19% during normal production, and the flexural strength is controlled to be 5KPa;
when the qualification rate of the iron notch is reduced by 5 percent and the iron notch is seriously splashed when the iron notch is opened and blocked, controlling the tar to be 19.5 percent and controlling the lower limit of the Marshall value to be 0.4MPa;
(2) The iron notch adopts a drill bit sleeve technology, different drill bits are adopted according to hot air pressure in the furnace, and when the double drill bits are used, the large-caliber drill bit is used first, and then the small-aperture drill bit is used, so that a horn mouth with large outside and small inside is formed;
when the hot air pressure is more than 450KPa, firstly using phi 65mm, the opening depth is 3-3.1 m, and then replacing a phi 62.5mm drill; when the hot air pressure is 450-445 KPa, firstly using phi 62.5mm, the opening depth is 2.9-3 m, and then replacing a phi 60mm drill; when the hot air pressure is less than 445KPa, a single phi 60mm drill bit is used for opening;
(3) When the iron slag is completely discharged, performing first plugging and mud pumping when the difference value between the theoretical iron amount and the actual iron amount is smaller than 10 tons; performing secondary mud beating after 3min intervals, and performing tertiary mud beating after 1min intervals;
the first plugging secondary mud beating amount is 280-350 kg, and the pressure is 24.5-25.5 MKPa; the second mud beating amount is 15kg, and the pressure is 25.5-26 MKP; the third mud beating amount is 5kg, and the mud beating pressure is 26-26.5 MKPa;
the first time of blocking and mud beating is determined according to the specific furnace inlet air quantity, when the air quantity is less than or equal to 6800m 3 At/min, controlling the mud amount to be 280kg; when the air quantity is 6800-7000 m 3 At the time of/min, controlling the mud beating amount to 320kg; when the air quantity is 7000-7200 m 3 Controlling the mud beating amount to be 340kg in a minute; when the air quantity is more than or equal to 7200m 3 The mud beating amount is controlled to be 350kg in per minute.
2. The method for compacting a tap hole channel of a blast furnace according to claim 1, wherein: if the average tapping time of the tap hole is reduced by more than 5min, adding fourth mud beating after 1min after the third mud beating, wherein the mud beating amount is controlled at 5kg, and the mud beating pressure is 26.5-27 MKPa.
3. The method for compacting a tap hole channel of a blast furnace according to claim 1, wherein: during normal production, the depth of the iron notch is controlled to be 3.7-3.8 m, when the depth of the iron notch exceeds the upper limit, the first mud beating amount is reduced by 20kg, and after the depth of the iron notch reaches the normal range, the first mud beating amount is gradually increased by four times, and 5kg is added each time; when the depth of the iron notch is lower than the lower limit, 15kg of the first mud beating amount is increased, and after the depth of the iron notch reaches the normal range, the first mud beating amount is gradually reduced by three times, and 5kg of the first mud beating amount is reduced each time.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002030316A (en) * | 2000-07-13 | 2002-01-31 | Kawasaki Steel Corp | Method for controlling depth of iron tapping hole in blast furnace |
| CN1850728A (en) * | 2006-05-19 | 2006-10-25 | 王恩余 | Blast furnace taphole Al2O3-SiC-C system no-water cannon mire |
| CN2853803Y (en) * | 2005-12-31 | 2007-01-03 | 张店钢铁总厂 | Drill for tapping machine of ironmaking blast furnace |
| CN111560487A (en) * | 2020-06-03 | 2020-08-21 | 北京首钢股份有限公司 | Treatment device and method for molten iron splashing of blast furnace taphole channel |
| CN111778375A (en) * | 2020-08-07 | 2020-10-16 | 新疆八一钢铁股份有限公司 | Maintenance method for iron notch of Ou metallurgical furnace |
| CN114574644A (en) * | 2022-03-30 | 2022-06-03 | 广东韶钢松山股份有限公司 | Method for prolonging service life of blast furnace |
-
2022
- 2022-10-21 CN CN202211297426.9A patent/CN115652004B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002030316A (en) * | 2000-07-13 | 2002-01-31 | Kawasaki Steel Corp | Method for controlling depth of iron tapping hole in blast furnace |
| CN2853803Y (en) * | 2005-12-31 | 2007-01-03 | 张店钢铁总厂 | Drill for tapping machine of ironmaking blast furnace |
| CN1850728A (en) * | 2006-05-19 | 2006-10-25 | 王恩余 | Blast furnace taphole Al2O3-SiC-C system no-water cannon mire |
| CN111560487A (en) * | 2020-06-03 | 2020-08-21 | 北京首钢股份有限公司 | Treatment device and method for molten iron splashing of blast furnace taphole channel |
| CN111778375A (en) * | 2020-08-07 | 2020-10-16 | 新疆八一钢铁股份有限公司 | Maintenance method for iron notch of Ou metallurgical furnace |
| CN114574644A (en) * | 2022-03-30 | 2022-06-03 | 广东韶钢松山股份有限公司 | Method for prolonging service life of blast furnace |
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