CN114959258B - Smelting method of blast furnace high-proportion pellets - Google Patents
Smelting method of blast furnace high-proportion pellets Download PDFInfo
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- CN114959258B CN114959258B CN202210600858.6A CN202210600858A CN114959258B CN 114959258 B CN114959258 B CN 114959258B CN 202210600858 A CN202210600858 A CN 202210600858A CN 114959258 B CN114959258 B CN 114959258B
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- 239000008188 pellet Substances 0.000 title claims abstract description 71
- 238000003723 Smelting Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000571 coke Substances 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 30
- 238000007599 discharging Methods 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 238000007664 blowing Methods 0.000 claims abstract description 9
- 230000009467 reduction Effects 0.000 claims abstract description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention belongs to the technical field of blast furnace smelting, and discloses a smelting method of high-proportion pellets of a blast furnace, which comprises the following steps: discharging furnace burden, namely mixing coke with pellets, and placing the mixture in the middle of a material section of the furnace burden, wherein the furnace burden comprises sinter, coke and pellets; charging furnace burden into a furnace top charging bucket, and carrying out blast furnace burden distribution to ensure that the mixed material of coke and pellets is positioned at the middle ring section of the furnace throat section; blowing hot air into the lower part of the furnace burden to carry out reduction smelting. The invention mixes pellets and coke together by controlling the discharging sequence of furnace burden, and when the materials are distributed, the mixed materials of the pellets and the coke are promoted to be positioned in the middle ring section of the cross section of the furnace throat, so that the rolling of the pellets is reduced, and the gas flow is more stable. Meanwhile, the central air flow is stabilized by blowing hot air into the lower part of the furnace burden, so that the air flow in the blast furnace is reasonably distributed, and the smooth proceeding of blast furnace smelting is ensured.
Description
Technical Field
The invention relates to the technical field of blast furnace smelting, in particular to a smelting method of high-proportion pellets of a blast furnace.
Background
The iron-containing furnace materials used in the blast furnace mainly comprise sintered ore, pellet ore and natural lump ore. The sinter and pellet are artificial rich ore obtained by high temperature processing of iron ore powder.
Compared with the sintered ore, the pellet ore has the advantages of high iron-containing grade, uniform granularity, high cold state strength, low FeO content, good reducibility and the like, a large amount of pellet ore is used in the blast furnace burden structure, the charging grade is obviously increased, the slag ratio is obviously reduced, and the improvement of economic indexes is facilitated.
However, the pellet ore has obvious defects, firstly, the pellet ore is easy to roll, and the rolling is more obvious along with the increasing of the proportion of the pellet ore, so that the shape of the material surface is difficult to stabilize, and the stability of the gas flow is reduced; secondly, the pellets are easy to expand when being heated and reduced, so that the uniformity of blast furnace discharging is affected, and the stability of the blast furnace condition is further affected; finally, the reflow temperature of the pellet ore is lower, in the furnace burden descending process, the reflow zone is widened due to premature softening, the blast furnace reflow zone is thickened, and the root of the reflow zone moves upwards integrally, so that the air permeability of the material column is deteriorated, the blast furnace pressure difference is increased, and the gas flow distribution is affected.
Disclosure of Invention
The invention aims to provide a smelting method of high-proportion pellets in a blast furnace, which can effectively control the rolling of materials caused by the increase of the proportion of the pellets, further improve the stability of the gas flow, and simultaneously has good stability of the central gas flow in the blast furnace, thereby being beneficial to ensuring the smooth proceeding of the blast furnace smelting.
To achieve the purpose, the invention adopts the following technical scheme:
a smelting method of high-proportion pellets in a blast furnace comprises the following steps:
S1, discharging furnace burden, namely mixing coke and pellet ore, and then placing the mixture in the middle of a material section of the furnace burden, wherein the furnace burden comprises sinter ore, the coke and the pellet ore;
s2, charging the furnace burden into a furnace top charging bucket, and carrying out blast furnace burden distribution to ensure that the mixed material of the coke and the pellets is positioned at the middle ring section of the furnace throat section;
S3, blowing hot air into the lower part of the furnace burden to carry out reduction smelting.
Optionally, in step S2, after charging the furnace roof charge into the furnace roof tank, the burden distribution is started when the blast furnace burden line reaches 1.20-1.50 m.
Optionally, the blast furnace comprises a blast furnace body and a distribution chute, wherein the distribution chute is connected to the top of the blast furnace body, and the distribution chute adopts a square chute.
Optionally, during the burden distribution, the burden is distributed from the outer ring to the inner ring.
Optionally, the distribution angle alpha of the pellets in the outer ring is 39-41 degrees, and the distribution angle alpha of the pellets in the inner ring is 31-34 degrees;
The distribution angle alpha of the coke in the outer ring is 38-40 degrees, and the distribution angle alpha of the coke in the inner ring is 25-28 degrees.
Optionally, in step S3, the bottom of the charge is blown through a tuyere of a blast furnace, the area of the tuyere being 0.40-0.44 m 2, and the length of the tuyere being 620-650 mm.
Optionally, the tuyere is inclined downwards with an inclination of 5 ° to 8 °.
Optionally, in step S1, the burden further includes lump ore, and the discharging sequence of the burden is that the sintered ore is discharged first, then the mixture of the coke and the pellet ore is discharged, and finally the lump ore is discharged, so that the mixture of the coke and the pellet ore is placed in the middle of the material section of the burden.
Optionally, the mass fraction of SiO 2 in the pellets is 3.0-5.0%, and the compressive strength of the pellets is more than or equal to 220daN.
Optionally, the alkalinity R of the sinter is 2.00-2.30%, the drum strength of the sinter is more than or equal to 78%, and the mass fraction of MgO in the sinter is 2.2-2.4%.
The invention has the beneficial effects that:
Firstly, discharging furnace charges, mixing coke and pellets, and then placing the mixture in the middle of a charging section of the furnace charges; charging furnace burden into a furnace top charging bucket, and carrying out blast furnace burden distribution to ensure that the mixed material of coke and pellets is positioned at the middle ring section of the furnace throat section; finally, blowing hot air into the lower part of the furnace burden to carry out reduction smelting. According to the invention, by controlling the discharging sequence of furnace burden, pellets and coke are mixed together and placed in the middle of a material section, and during material distribution, the mixed material of the pellets and the coke is promoted to be positioned in the middle ring section of the cross section of the furnace throat, so that the rolling of the pellets is reduced, and the stability of the gas flow is improved. Meanwhile, the central air flow is stabilized by blowing hot air into the lower part of the furnace burden, so that the air flow in the blast furnace is reasonably distributed, and further the smooth proceeding of blast furnace smelting is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
Fig. 1 is a schematic structural diagram of a distribution chute during distribution in a smelting method of high-proportion pellets in a blast furnace according to an embodiment of the present invention.
In the figure:
1. A blast furnace body; 2. and a distribution chute.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments 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 some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The embodiment provides a smelting method of high-proportion pellets of a blast furnace, which comprises the following steps:
S1, discharging furnace burden, namely mixing coke with pellets, and placing the mixture in the middle of a material section of the furnace burden, wherein the furnace burden comprises sinter, coke and pellets. Before charging the furnace burden into the blast furnace, discharging the furnace burden, and pre-placing the mixed material of coke and pellets in the middle of a material section so as to control the distribution position of the coke and pellets in the subsequent distribution.
S2, charging furnace burden into a furnace top charging bucket, and carrying out blast furnace burden distribution to enable the mixed material of coke and pellets to be positioned in the middle ring section of the furnace throat section. After discharging, charging materials are loaded into a furnace top charging bucket, and then the charging materials are distributed, so that the charging materials are placed into a blast furnace. During distributing, the coke and pellet ore are controlled to fall into the blast furnace, so that the mixed material of the coke and the pellet ore is still positioned in the middle of the distributed furnace burden, and the rolling of the pellet ore can be blocked by other peripheral materials, so that the stability of the coal gas flow is improved.
S3, blowing hot air into the lower part of the furnace burden to carry out reduction smelting.
According to the embodiment, the discharging sequence of the furnace burden is controlled, so that pellets and coke are mixed together and placed in the middle of the material section, and during material distribution, the mixed materials of the pellets and the coke are promoted to be positioned in the middle ring section of the cross section of the furnace throat, so that the rolling of the pellets is reduced, and the stability of the gas flow is improved. Meanwhile, the central air flow is stabilized by blowing hot air into the lower part of the furnace burden, so that the air flow in the blast furnace is reasonably distributed, and further the smooth proceeding of blast furnace smelting is ensured.
Optionally, in step S2, after charging the furnace roof charge, the burden distribution is started when the blast furnace burden line reaches 1.20-1.50 m.
Alternatively, as shown in fig. 1, the blast furnace comprises a blast furnace body 1 and a distribution chute 2, the distribution chute 2 being connected to the top of the blast furnace body 1. The distribution chute 2 adopts a square chute. The bottom of the square chute is a right angle, and the right angle structure can reduce the rolling of furnace burden falling into the blast furnace body 1 through the square chute.
Optionally, during burden distribution, burden is distributed from the outer ring to the inner ring. The outer ring furnace burden is distributed firstly, and then the inner ring furnace burden is distributed, so that the rolling range of the inner ring furnace burden can be limited through the outer ring furnace burden.
Optionally, with continued reference to fig. 1, the outer ring pellets have a distribution angle α of 39-41 ° and the inner ring pellets have a distribution angle α of 31-34 °. It can be understood that the burden distribution angle alpha is the inclination angle of the burden distribution chute 2.
Further, the distribution angle alpha of the outer ring coke is 38-40 degrees, and the distribution angle alpha of the inner ring coke is 25-28 degrees.
Optionally, in step S3, the bottom of the charge is blown through the tuyere of the blast furnace to stabilize the central air flow inside the blast furnace body 1. Preferably, the area of the air port is 0.40-0.44 m 2, the length of the air port is 620-650 mm, and the effect is optimal.
Optionally, the tuyere is inclined downwards with an inclination of 5-8 degrees so as to ensure that the angle of hot air blown into the blast furnace body 1 is inclined upwards, and further improve the efficiency of blast furnace smelting.
Optionally, in step S1, the burden further includes lump ore, and the discharging sequence of the burden is that sinter ore is discharged first, then the mixture of coke and pellet ore is discharged, and finally lump ore is discharged, so that the mixture of coke and pellet ore is placed in the middle of the material section of the burden, and the pellet ore is further prevented from rolling during burden distribution, thereby being beneficial to improving the stability of the gas flow.
Optionally, the mass fraction of SiO 2 in the pellets is 3.0-5.0%, and the compressive strength of the pellets is more than or equal to 220daN.
Optionally, the alkalinity R of the sinter is 2.00-2.30%, the drum strength of the sinter is more than or equal to 78%, and the mass fraction of MgO in the sinter is 2.2-2.4%.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (7)
1. A smelting method of blast furnace high proportion pellets is characterized by comprising the following steps:
S1, discharging furnace burden, namely mixing coke and pellet ore, and then placing the mixture in the middle of a material section of the furnace burden, wherein the furnace burden comprises sinter ore, the coke and the pellet ore;
s2, charging the furnace burden into a furnace top charging bucket, and carrying out blast furnace burden distribution to ensure that the mixed material of the coke and the pellets is positioned at the middle ring section of the furnace throat section;
S3, blowing hot air into the lower part of the furnace burden to perform reduction smelting;
In step S2, after charging the furnace burden into the furnace roof charging bucket, starting to distribute when the blast furnace burden line reaches 1.20-1.50 m;
the blast furnace comprises a blast furnace body (1) and a distribution chute (2), wherein the distribution chute (2) is connected to the top of the blast furnace body (1), and the distribution chute (2) adopts a square chute;
In the step S3, blowing air to the bottom of the furnace burden through a tuyere of a blast furnace, wherein the area of the tuyere is 0.40-0.44 m 2, and the length of the tuyere is 620-650 mm.
2. The method for smelting high-proportion pellets in a blast furnace according to claim 1, wherein the burden is distributed from the outer ring to the inner ring during the distribution.
3. The smelting method of the blast furnace high proportion pellet ore according to claim 2, wherein the distribution angle alpha of the pellet ore of the outer ring is 39-41 degrees, and the distribution angle alpha of the pellet ore of the inner ring is 31-34 degrees;
The distribution angle alpha of the coke in the outer ring is 38-40 degrees, and the distribution angle alpha of the coke in the inner ring is 25-28 degrees.
4. The method for smelting high-proportion pellets in a blast furnace according to claim 1, wherein the tuyere is inclined downward at an inclination of 5 ° to 8 °.
5. The method according to any one of claims 1 to 4, wherein in step S1, the burden further comprises lump ore, the burden is discharged in the order of discharging the sintered ore, then discharging the mixture of the coke and the pellets, and finally discharging the lump ore so that the mixture of the coke and the pellets is placed in the middle of the burden section.
6. The smelting method of blast furnace high proportion pellets according to claim 5, wherein the mass fraction of SiO 2 in the pellets is 3.0-5.0%, and the compressive strength of the pellets is not less than 220daN.
7. The method for smelting high proportion pellets in a blast furnace according to claim 5, wherein the basicity R of the agglomerate is 2.00-2.30%, the drum strength of the agglomerate is not less than 78%, and the mass fraction of MgO in the agglomerate is 2.2-2.4%.
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| CN202210600858.6A CN114959258B (en) | 2022-05-30 | 2022-05-30 | Smelting method of blast furnace high-proportion pellets |
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| CN202210600858.6A CN114959258B (en) | 2022-05-30 | 2022-05-30 | Smelting method of blast furnace high-proportion pellets |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010920A (en) * | 2010-12-24 | 2011-04-13 | 宝钢集团新疆八一钢铁有限公司 | Method for smelting bell-less top blast furnace high proportion pellet ore burden structure |
| CN114015824A (en) * | 2021-10-29 | 2022-02-08 | 包头钢铁（集团）有限责任公司 | Blast furnace smelting control process for increasing pellet ore proportion |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000007444A (en) * | 1998-07-03 | 2000-02-07 | 이구택 | Charging method of charging material in operation of blast furnace |
| CN101280348A (en) * | 2008-04-23 | 2008-10-08 | 沈阳东方钢铁有限公司 | High-temperature coal gas blast furnace iron-smelting process |
| CN110923379B (en) * | 2019-11-05 | 2022-02-11 | 攀钢集团西昌钢钒有限公司 | Blast furnace burden distribution method for smelting vanadium titano-magnetite |
| CN111850197B (en) * | 2020-07-07 | 2022-02-15 | 鞍钢股份有限公司 | Method for increasing proportion of blast furnace smelting lump ore |
| CN112226558A (en) * | 2020-10-12 | 2021-01-15 | 王玉平 | Blast furnace iron-smelting method using high-proportion alkaline pellets and pellet distributing machine |
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- 2022-05-30 CN CN202210600858.6A patent/CN114959258B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010920A (en) * | 2010-12-24 | 2011-04-13 | 宝钢集团新疆八一钢铁有限公司 | Method for smelting bell-less top blast furnace high proportion pellet ore burden structure |
| CN114015824A (en) * | 2021-10-29 | 2022-02-08 | 包头钢铁（集团）有限责任公司 | Blast furnace smelting control process for increasing pellet ore proportion |
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