CN108660291A - Method for preheating limestone by using converter - Google Patents
Method for preheating limestone by using converter Download PDFInfo
- Publication number
- CN108660291A CN108660291A CN201710196139.1A CN201710196139A CN108660291A CN 108660291 A CN108660291 A CN 108660291A CN 201710196139 A CN201710196139 A CN 201710196139A CN 108660291 A CN108660291 A CN 108660291A
- Authority
- CN
- China
- Prior art keywords
- converter
- preheating
- limestone
- lime stone
- furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 235000019738 Limestone Nutrition 0.000 title claims abstract description 76
- 239000006028 limestone Substances 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002893 slag Substances 0.000 claims abstract description 15
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 238000010304 firing Methods 0.000 claims abstract description 7
- 238000010079 rubber tapping Methods 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 7
- 230000003749 cleanliness Effects 0.000 claims description 5
- 241001417490 Sillaginidae Species 0.000 claims description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 12
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 12
- 239000004571 lime Substances 0.000 abstract description 12
- 238000003723 Smelting Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 210000000038 chest Anatomy 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 235000004332 Citrus madurensis Nutrition 0.000 description 1
- 235000007438 Citrus mitis Nutrition 0.000 description 1
- 244000007645 Citrus mitis Species 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007499 fusion processing Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
-
- 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
-
- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a method for preheating limestone by using a converter, which comprises the steps of selecting a furnace time that the tapping end point temperature is more than or equal to 1640 ℃, and carrying out limestone preheating operation when the temperature of the furnace bottom and the inner wall of a surrounding hearth reaches more than 1100 ℃; and (3) performing slag dumping operation after slag splashing on the selected furnace number for limestone preheating, wherein the residual slag amount in the converter is not more than 10%. Controlling the limestone granularity to be 10-80 mm, and firing the limestone with the firing amount of 300-1000 kg/time; before adding iron and adding scrap steel, adding limestone into a converter from an overhead bin or a scrap steel groove; rotating the converter mouth from the horizontal position to a range of 90-110 degrees, uniformly dispersing limestone at the bottom of the converter, keeping the thickness of a material layer at 10-200 mm, and then keeping the converter body standing for less than 40 minutes; and after the preheating is finished, carrying out next furnace smelting preparation. The method reduces the consumption of metallurgical lime in the next furnace for subsequent slagging to 40-50% of the total amount of preheated limestone; the amount of the partial scrap steel which can be increased by preheating the limestone is 0.5 t-1.5 t.
Description
Technical field
It is the present invention relates to field of steel-making, more particularly to a kind of to carry out lime stone pre-heating mean using converter.
Background technology
Lime stone can substitute partial metallurgical lime as one of pneumatic steelmaking smelting slag making material.Lime stone generally exists
Initial smelting period is added, and is acted on by molten iron temperature and oxygen blast process melting bath stirring, decomposition of limestone.1t lime stones are added in smelting process
30~40 DEG C or so of temperature drop can be generated.The heat absorbed in lime stone fusion process affects turn to a certain extent
The addition of stove steel scrap amount.Country's Wuhan Iron and Steel Plant, the iron and steel corporations such as this steel at present, in convertor steelmaking process, use more lime stone into
Row converter is had more than needed thermal balance, is substituted partial metallurgical lime and is carried out slag making adjustment.Major iron and steel enterprise it is typically no using converter into
Row targetedly lime stone preheating, firing control.
Invention content
Lime stone pre-heating mean being carried out using converter technical problem to be solved by the invention is to provide a kind of, it is effective to drop
Low lime stone is added to the temperature loss that molten steel slag making is brought, and the lime stone that 20~30% ratios may be implemented is thermally decomposed into
Lime reduces metallurgy lime dosage, increases part adding amount of scrap steel.
To achieve the above object, the present invention is realized using following technical scheme：
It is a kind of to carry out lime stone pre-heating mean using converter, it is as follows：
1) in-furnace temperature control before preheating：Selection tapping outlet temperature >=1640 DEG C heat, furnace bottom and surrounding inboard wall of burner hearth
Temperature carries out lime stone warm-up operation up to 1100 DEG C or more；
2) cleanliness factor control in forehearth is preheated：The heat that lime stone preheating is carried out to selection carries out deslagging operation after splashing slag,
Clinker residual quantity is not more than 10% in converter, is wrapped up with residue after preventing lime stone from entering stove, influences lime stone layer distribution and pre-
Thermal effect；
3) lime stone stock control before preheating：Control 10~80mm of limestone granularity, firing amount 300~1000kg/ times；
4) preheating in stove：Before iron making plus steel scrap, lime stone is added by high hopper or via scrap box in Converter；
And rotate converter mouth to 90 degree~110 degree sections by horizontal position, furnace bottom lime stone uniformly scatters, and thickness of feed layer 10~
200mm, then converter body holding are stood, and preheating time is less than 40 minutes；
5) next stove is carried out after preheating smelts preparation.Metallurgy lime dosage is pre- when reducing the follow-up slag making of next heat
The 40%~50% of hot lime stone total amount；It is 0.5t~1.5t because lime stone preheats increasable part steel scrap amount.
Compared with prior art, the beneficial effects of the invention are as follows：
The method that the present invention carries out preheating, the firing of lime stone using steelmaking converter heat source, effectively reduces lime stone
The temperature loss brought when molten steel slag making is added, part lime stone may be implemented and be thermally decomposed into lime, and suitably increase steel scrap
Addition.
Specific implementation mode
The specific implementation mode of the present invention is further illustrated below：
It is a kind of to carry out lime stone pre-heating mean using converter,
1) in-furnace temperature control before preheating：Selection tapping outlet temperature >=1640 DEG C heat, furnace bottom and surrounding inboard wall of burner hearth
Temperature carries out lime stone warm-up operation up to 1100 DEG C or more；
2) cleanliness factor control in forehearth is preheated：The heat that lime stone preheating is carried out to selection carries out deslagging operation after splashing slag,
Clinker residual quantity is not more than 10% in converter, is wrapped up with residue after preventing lime stone from entering stove, influences lime stone layer distribution and pre-
Thermal effect.
3) lime stone stock control before preheating：Control 10~80mm of limestone granularity, firing amount 300~1000kg/ times；Grain
Degree be not easy it is too small, undersized preheating fire after be easy to form powdery.Granularity is excessive, influences lime stone preheating, fires effect.
4) preheating in stove：Before iron making plus steel scrap, lime stone is added by high hopper or via scrap box in Converter；
And rotate converter mouth to 90 degree~110 degree sections by horizontal position, lime stone is subjected to displacement, and is uniformly scattered in furnace bottom, by
Hot area increases, 10~200mm of thickness of feed layer, and then converter body keeps standing, and preheating time is less than 40 minutes.Lime stone is pre-
In thermal process, part lime stone is heated to be decomposed into lime, and metallurgy lime dosage when reducing follow-up slag making increases part steel scrap and is added
Amount.
5) it carries out next stove after preheating and smelts to prepare, metallurgy stone when the step 4) reduces the follow-up slag making of next heat
Grey dosage is the 40%~50% of preheating lime stone total amount；Because lime stone preheat increasable part steel scrap amount be 0.5t~
1.5t。
Embodiment 1：
It is a kind of to carry out lime stone pre-heating mean using converter,
1) in-furnace temperature control before preheating：Terminal Process Control tapping temperature reaches 1670 DEG C, measures furnace bottom and surrounding stove
Thorax inner wall temperature is up to 1150 DEG C.
2) cleanliness factor control in forehearth is preheated：The heat that lime stone preheating is carried out to selection carries out deslagging operation after splashing slag,
Clinker residual quantity is the 5% or less of total amount in converter.
3) lime stone stock control before preheating：The limestone granularity of selection is 40~60mm.
4) the pre- heat 400kg of selection lime stone.
5) preheating in stove：Before iron making plus steel scrap, lime stone is added by high hopper in Converter.And by converter mouth
It is rotated to 95 degree by horizontal position, prevents poly- heap, thickness of feed layer about 80~180mm.
6) according to heat interval, converter stands 4min after lime stone is added.Pre- hot work is carried out to the lime stone of addition.20
~25% ratio lime stone is thermally decomposed into lime, after preheating, is carried out next stove and is smelted preparation.Next heat reduces metallurgical
Lime consumption 200kg；It is 0.8t because lime stone preheats increasable part steel scrap amount.
Embodiment 2：
1) in-furnace temperature control before preheating：Terminal Process Control tapping temperature reaches 1680 DEG C, measures furnace bottom and surrounding stove
Thorax inner wall temperature is up to 1200 DEG C.
2) cleanliness factor control in forehearth is preheated：Lime stone is carried out to pre-selection and preheats heat, deslagging operation is carried out after splashing slag, turns
Clinker residual quantity is the 2% or less of total amount in stove.
3) lime stone stock control before preheating：The limestone granularity of selection is 30~50mm.
4) the pre- heat 800kg of selection lime stone.
5) preheating in stove：Before iron making plus steel scrap, lime stone scrap box is added in Converter.And by converter mouth by
Horizontal position is rotated to 105 degree, prevents poly- heap, thickness of feed layer about 60~150mm.
6) according to heat interval, converter stands 25min after lime stone is added.Pre- hot work is carried out to the lime stone of addition.
25~30% ratio lime stones are thermally decomposed into lime, after preheating, are carried out next stove and are smelted preparation.Next heat reduces smelting
Golden lime consumption 400kg；It is 1.0t because lime stone preheats increasable part steel scrap amount.
Described above is only the basic principle of the present invention, is not imposed any restrictions to the present invention, every right according to the present invention
It carries out equivalent variations and modification, within the scope of the art of this patent protection scheme.
Claims (1)
1. a kind of carrying out lime stone pre-heating mean using converter, which is characterized in that be as follows：
1) in-furnace temperature control before preheating：Selection tapping outlet temperature >=1640 DEG C heat, furnace bottom and surrounding inboard wall of burner hearth temperature
Up to 1100 DEG C or more, lime stone warm-up operation is carried out；
2) cleanliness factor control in forehearth is preheated：The heat that lime stone preheating is carried out to selection carries out deslagging operation, converter after splashing slag
Interior clinker residual quantity is not more than 10%；
3) lime stone stock control before preheating：Control 10~80mm of limestone granularity, firing amount 300~1000kg/ times；
4) preheating in stove：Before iron making plus steel scrap, lime stone is added by high hopper or via scrap box in Converter；And it will
Converter mouth is rotated by horizontal position to 90 degree~110 degree sections, and furnace bottom lime stone uniformly scatters, 10~200mm of thickness of feed layer,
Then converter body keeps standing, and preheating time is less than 40 minutes；
5) next stove is carried out after preheating smelts preparation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710196139.1A CN108660291A (en) | 2017-03-29 | 2017-03-29 | Method for preheating limestone by using converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710196139.1A CN108660291A (en) | 2017-03-29 | 2017-03-29 | Method for preheating limestone by using converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108660291A true CN108660291A (en) | 2018-10-16 |
Family
ID=63786439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710196139.1A Pending CN108660291A (en) | 2017-03-29 | 2017-03-29 | Method for preheating limestone by using converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108660291A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102660658A (en) * | 2012-05-23 | 2012-09-12 | 河北省首钢迁安钢铁有限责任公司 | Method for curing converter slag |
| CN102766724A (en) * | 2012-07-12 | 2012-11-07 | 东北大学 | Method adopting oxygen lance to jet granulated powder limestone to make slag and steel in combined blown converter |
| CN102888487A (en) * | 2012-10-12 | 2013-01-23 | 武汉钢铁(集团)公司 | High-efficiency remaining slag smelting method of converters |
| CN103060508A (en) * | 2013-01-17 | 2013-04-24 | 莱芜钢铁集团有限公司 | Smelting method for improving phosphorus removal rate of converter |
| CN104451023A (en) * | 2013-09-24 | 2015-03-25 | 上海梅山钢铁股份有限公司 | Smelting method for retaining hot dreg of converter |
-
2017
- 2017-03-29 CN CN201710196139.1A patent/CN108660291A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102660658A (en) * | 2012-05-23 | 2012-09-12 | 河北省首钢迁安钢铁有限责任公司 | Method for curing converter slag |
| CN102766724A (en) * | 2012-07-12 | 2012-11-07 | 东北大学 | Method adopting oxygen lance to jet granulated powder limestone to make slag and steel in combined blown converter |
| CN102888487A (en) * | 2012-10-12 | 2013-01-23 | 武汉钢铁(集团)公司 | High-efficiency remaining slag smelting method of converters |
| CN103060508A (en) * | 2013-01-17 | 2013-04-24 | 莱芜钢铁集团有限公司 | Smelting method for improving phosphorus removal rate of converter |
| CN104451023A (en) * | 2013-09-24 | 2015-03-25 | 上海梅山钢铁股份有限公司 | Smelting method for retaining hot dreg of converter |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181016 |
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| RJ01 | Rejection of invention patent application after publication |