CN105779682B - A kind of technique of utilization lime stone smelting stainless steel in dephosphorization converter - Google Patents
A kind of technique of utilization lime stone smelting stainless steel in dephosphorization converter Download PDFInfo
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- CN105779682B CN105779682B CN201610149730.7A CN201610149730A CN105779682B CN 105779682 B CN105779682 B CN 105779682B CN 201610149730 A CN201610149730 A CN 201610149730A CN 105779682 B CN105779682 B CN 105779682B
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- lime stone
- lime
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- 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
- C21C5/30—Regulating or controlling the blowing
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- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
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Abstract
The invention discloses a kind of technique of utilization lime stone smelting stainless steel in dephosphorization converter, belong to stainless steel technical field of smelting.It is main to substitute the smelting that lime carries out stainless steel in dephosphorization converter using lime stone part, expand lime stone in the prior art and substituted application of the lime in iron and steel smelting technology field, realized inexpensive auxiliary material and smelt the stainless steel grade of high-quality；And the good bottom blowing stirring condition of dephosphorization converter is taken full advantage of, the rapid melting of lime stone, lime and iron oxide ball is realized, the purpose of quick dephosphorization is reached.
Description
Technical field
The invention belongs to stainless steel technical field of smelting, and in particular to one kind utilizes lime stone smelting in dephosphorization converter
The technique for refining stainless steel.
Background technology
In the steel series smelting process of stainless steel 400, the main purpose of dephosphorization converter is dephosphorization, demanganize, is answered to argon oxygen
Blown converter provides the high quality low phosphor molten iron of composition and proper temperature.At present due in molten iron silicon, manganese equal size it is higher, oxygen blast process
Middle releasing heat, causes whole processing procedure temperature to be had more than needed, and is unfavorable for the removal of the elements such as phosphorus, manganese, therefore whole molten iron is located in advance
The control of reason process temperature is particularly important.In the prior art due in initial smelting period molten iron silicon largely aoxidize, temperature is drastically
Rise, must not be added without substantial amounts of cold burden to control process temperature and be cooled, cause supplementary product onsumption to increase, smelting cost liter
It is high；And severe stainless steel market makes reduction smelting cost turn into the development trend of steel industry, in addition, in slag making raw material lime
It is calcined on pneumatic steelmaking this industrial chain, there is the physical thermal and CO entrained by the lime for wasting and having calcined2Excess emissions
The problem of causing increase environmental pollution.
In view of the above-mentioned problems, the method for the use replacing lime with limestone for slagging and producing steel that University of Science ＆ Technology, Beijing proposes, by each
Steel mill uses one after another.Chinese patent（Application number 201410104522.6）Propose one kind and substitute part using small grain size lime stone
The new method of lime steel-making, by the granularity for reducing lime stone（3-5mm）The addition time with lime stone is changed, reach rapid rush
Enter decomposition of limestone, generation effective CaO and help the purpose of slag making, it is ensured that steel quality and smelting process it is steady, reduce
The cost of flux；Chinese patent（Application number 201410320701.3）Propose a kind of converter operation of lime stone low phosphorus steel by smelting
Method, converter auxiliary material substitutes active lime completely using lime stone, and lime stone passes through high hopper and added more than in three batches；Blow
Refining mode uses and stays slag and double slag operation；Outlet temperature control is at 1620-1660 DEG C, and terminal C is 0.03-0.04%, and terminal P can
Reach 0.008-0.012%.
Above lime stone substitutes the method for making steel of lime, focuses mostly in oxygen coverter region and carbon steel field of smelting.
The content of the invention
It is existing to expand it is an object of the invention to provide a kind of technique of utilization lime stone smelting stainless steel in dephosphorization converter
There is lime stone in technology to substitute application of the lime in iron and steel smelting technology field, realize inexpensive auxiliary material and smelt high-quality
Stainless steel grade.
The present invention specifically includes following steps using the technique of lime stone smelting stainless steel in dephosphorization converter：
（1）Lime stone is added in dephosphorization converter：The lime stone of 5.0-5.5kg/t molten iron is added in dephosphorization converter, it is front and rear
Grate, makes it uniformly be layered on furnace bottom；Lime stone from granularity for 10-65mm big granularity lime stone to reduce slag making cost,
Lime stone composition contains CaO by percentage to the quality：50-55%, SiO2：4-5%, MgO：1.2-1.5%；
（2）Iron making：Molten iron is injected into dephosphorization converter, lime stone calcined by molten iron temperature；Hot metal composition
Contain C by percentage to the quality：3.5-4.6%, Si：0.40-0.9%, Mn：0.60-0.9%, P：0.05-0.12%, it is other for Fe and
Inevitable impurity, molten iron temperature is 1200-1320 DEG C；
（3）Desiliconization is handled：Top blast oxygen flow 90-150Nm3/ min, oxygen lance position 1500-1700mm, bottom blowing nitrogen stream
Measure as 6-10Nm3/min；Control clinker target dual alkalinity（CaO/SiO2）For 2.0-2.5,1.5- is added according to slag fluidity
The fluorite of 2.5kg/t molten iron and the light dolomite of 14.0-16.0kg/t molten iron, to adjust slag structure, reduce clinker to de-
The corrosion function of phosphorus converter, processing time 6-8min；
（4）Deslagging：After desiliconization terminates, grate outwells thickness and is 50-100mm, is unfavorable for the low alkalinity clinker of dephosphorization；
（5）Dephosphorization treatment：Dephosphorization under oxidizing atmosphere processing is carried out to molten iron in stove, top blast oxygen flow is 70-90Nm3/ min, oxygen
Rifle rifle position 1500-1700mm, bottom blowing nitrogen flow is 6-12Nm3/min；Whole process nitrogen buffer gas, with spray gun to molten iron
In be persistently blown effective CaO content >=88%, granularity be 10-50mm passive lime powder, passive lime powder injection amount 5-10kg/
Min, is blown time 9-10 minute；Be blown pulverized limestone while into stove add 10-12kg/t molten iron and step（1）Middle granularity
With composition identical lime stone, effective CaO content >=88% of 15-20kg/t molten iron, the lime and 12.3- that granularity is 10-50mm
The granularity of 13.8kg/t molten iron is 30-50mm iron oxide ball, so that clinker reaches the basicity and oxidisability of dephosphorization requirement.
（6）Tapping：Tapped after dephosphorization converter terminal point control into ladle and carry out follow-up AOD processing, terminal point control condition is：
Molten steel component contains C by percentage to the quality：3.0-3.5%, Mn：0.15-0.25%, P：0.012-0.02%, other is Fe and residual
Impurity；1400-1450 DEG C of molten steel temperature.
The stainless steel smelted in the present invention is 400 series stainless steel kinds.
The present invention has the advantages that compared to prior art：
（1）The technique of utilization lime stone smelting stainless steel in dephosphorization converter of the present invention, is substituted using lime stone part
Lime carries out the smelting of stainless steel in dephosphorization converter, expands lime stone in the prior art and substitutes lime in iron and steel smelting technology field
Application, realize inexpensive auxiliary material and smelt the stainless steel grade of high-quality.
（2）The present invention takes full advantage of the good bottom blowing stirring condition of dephosphorization converter, realizes lime stone, lime and iron oxide
The rapid melting of ball, reaches the purpose of quick dephosphorization.
（3）The present invention is substituted after the lime of part using lime stone, and the amount of dusting of oxygen rifle greatly reduces, and alleviates passive lime
Erosion during powder injection to spray gun, extends the service life of spray gun.
（4）The present invention reinjects molten iron after adding lime stone in dephosphorization converter stove, can be by molten iron temperature to lime stone
Decomposed, so as to control dephosphorization early stage temperature, improve dephosphorization efficiency.
Embodiment
For a better understanding of the present invention, with reference to specific embodiment, the invention will be further described.
Embodiment 1
A kind of utilization lime stone smelting stainless steel 410S in dephosphorization converter technique, it is comprised the following steps that：
（1）Lime stone is added in dephosphorization converter：The lime stone of addition 5.0kg/t molten iron in dephosphorization converter, front and rear grate,
It is set uniformly to be layered on furnace bottom；Wherein limestone granularity is 10mm, and lime stone composition contains CaO by percentage to the quality：50.0%,
SiO2：4.0%, MgO：1.2%；
（2）Iron making：87t temperature is injected into dephosphorization converter for 1200 DEG C of molten iron, by molten iron temperature to lime stone
Calcined；The composition of molten iron contains C by percentage to the quality：3.5%, Si：0.40%, Mn：0.60%, P：0.05%, other is Fe
With inevitable impurity；
（3）Desiliconization is handled：Top blast oxygen flow 90Nm3/ min, oxygen lance position 1700mm, bottom blowing nitrogen flow 6Nm3/min；
It is 2.0 to control clinker dual alkalinity, adds 130.5kg CaF2 Content is the fluorite that 80%, granularity is 10mm and 1218kg MgO
Content is the light dolomite that 50%, granularity is 50mm, processing time 6min；
（4）Deslagging：Grate outwells the clinker that thickness is 50mm；
（5）Dephosphorization treatment：Dephosphorization under oxidizing atmosphere processing, top blast oxygen flow 70Nm are carried out to molten iron in stove3/ min, oxygen lance position
1700mm, bottom blowing nitrogen flow 6Nm3/min；Whole process nitrogen buffer gas, with spray gun, into molten iron, lasting injection is effective
CaO content is the passive lime powder that 91%, granularity is 30mm, and passive lime powder injection amount 5kg/min is blown time 9min；Injection
Add 870kg's and step into molten iron while pulverized limestone（1）Middle granularity and composition identical lime stone, 1305kg are effective
CaO content is the iron oxide ball that the lime that 90%, granularity is 30mm and 1070kg granularities are 30mm；
（6）Tapping：Molten steel component contains C by percentage to the quality：3.0%, Mn：0.15%, P：0.012%, it is other for Fe and residual
Stay impurity；1400 DEG C of molten steel temperature, tap 85t.
Embodiment 2
A kind of technique of utilization lime stone smelting stainless steel 430 in dephosphorization converter, it is comprised the following steps that：
（1）Lime stone is added in dephosphorization converter：The lime stone of addition 5.5kg/t molten iron in dephosphorization converter, front and rear grate,
It is set uniformly to be layered on furnace bottom；Wherein, limestone granularity is 65mm；Lime stone composition contains CaO with mass percent：55.0%,
SiO2：5.0%, MgO：1.5%；
（2）Iron making：97t temperature is injected into dephosphorization converter for 1320 DEG C of molten iron, by molten iron temperature to lime stone
Calcined；The composition of molten iron contains C by percentage to the quality：4.6%, Si：0.9%, Mn：0.9%, P：0.12%, it is other for Fe and
Inevitable impurity；
（3）Desiliconization is handled：Top blast oxygen flow 150Nm3/ min, oxygen lance position 1500mm, bottom blowing nitrogen flow are 10Nm3/
min；It is 2.5 to control clinker dual alkalinity, adds 242.5kg CaF2Content is the fluorite and 1552kg that 75%, granularity is 30mm
Content of MgO is the light dolomite that 52%, granularity is 10mm, processing time 7min；
（4）Deslagging：Grate outwells the clinker that thickness is 100mm；
（5）Dephosphorization treatment：Dephosphorization under oxidizing atmosphere processing, top blast oxygen flow 90Nm are carried out to molten iron in stove3/ min, oxygen lance position
1500mm, bottom blowing nitrogen flow 12Nm3/min；Whole process is by nitrogen as carrier gas, and with spray gun, into molten iron, lasting injection has
Effect CaO content is the passive lime powder that 88%, granularity is 50mm, and passive lime powder injection amount is 10kg/min, is blown the time
9min；Add 1164kg's and step into stove while being blown pulverized limestone（1）Middle granularity and composition identical lime stone,
1940kg effective CaO contents are the iron oxide ball that the lime that 90%, granularity is 50mm and 1338.6kg granularities are 50mm；
（6）Tapping：Molten steel component contains C by percentage to the quality：3.5%, Mn：0.25%, P：0.02%, it is other for Fe and residual
Stay impurity；1450 DEG C of molten steel temperature, tap 95t.
Embodiment 3
A kind of utilization lime stone smelting stainless steel 409L in dephosphorization converter technique, it is comprised the following steps that：
（1）Lime stone is added in dephosphorization converter：The lime stone of addition 5.2kg/t molten iron in dephosphorization converter, front and rear grate,
It is set uniformly to be layered on furnace bottom；Wherein limestone granularity is 40mm, and lime stone composition contains CaO by percentage to the quality：54.0%,
SiO2：4.5%, MgO：1.3%；
（2）Iron making：92t temperature is injected into dephosphorization converter for 1265 DEG C of molten iron, by molten iron temperature to lime stone
Calcined；The composition of molten iron contains C by percentage to the quality：4.5%, Si：0.56%, Mn：0.82%, P：0.07%, other is Fe
With inevitable impurity；
（3）Desiliconization is handled：Top blast oxygen flow 100Nm3/ min, oxygen lance position 1600mm, bottom blowing nitrogen flow 10Nm3/
min；It is 2.5 to control clinker dual alkalinity, adds 211.6kg CaF2 Content be the fluorite that 80%, granularity is 40mm and
1453.6kg content of MgO is the light dolomite that 55%, granularity is 30mm, processing time 8min；
（4）Deslagging：Grate outwells thickness for 100mm clinkers；
（5）Dephosphorization treatment：Dephosphorization under oxidizing atmosphere processing, top blast oxygen flow 80Nm are carried out to molten iron in stove3/ min, oxygen lance position
1600mm, bottom blowing nitrogen flow 10Nm3/min；Whole process is by nitrogen as carrier gas, and with spray gun, into molten iron, lasting injection has
Effect CaO content is the passive lime powder that 90%, granularity is 40mm, and passive lime powder injection amount 9kg/min is blown time 9min；Spray
1039.6kg and step are added into molten iron while blowing pulverized limestone（1）Middle granularity and composition identical lime stone, 1444.4kg
Effective CaO content be the lime that 91%, granularity is 40mm and 1251.2kg granularity be 20mm iron oxide ball；
（6）Tapping：Molten steel component contains C by percentage to the quality：3.44%, Mn：0.21%, P：0.013%, it is other for Fe and
Residual impurity；1437 DEG C of molten steel temperature, tap 90.2t.
Claims (5)
1. a kind of technique of utilization lime stone smelting stainless steel in dephosphorization converter, it is characterised in that：Comprise the following steps：
（1）Lime stone is added in dephosphorization converter：The lime stone of addition 5.0-5.5kg/t molten iron in dephosphorization converter, front and rear grate,
It is set uniformly to be layered on furnace bottom；
（2）Iron making：Molten iron is injected into dephosphorization converter, lime stone calcined by molten iron temperature；The composition of molten iron with
Mass percent meter contains C：3.5-4.6%, Si：0.40-0.9%, Mn：0.60-0.9%, P：0.05-0.12%, it is other for Fe and not
Impurity can be avoided, molten iron temperature is 1200-1320 DEG C；
（3）Desiliconization is handled：Top blast oxygen flow 90-150Nm3/ min, oxygen lance position 1500-1700mm, bottom blowing nitrogen flow 6-
10Nm3/min；It is 2.0-2.5 to control clinker dual alkalinity, adds the fluorite and 14.0-16.0kg/t of 1.5-2.5kg/t molten iron
The dolomite of molten iron, processing time 6-8min；
（4）Deslagging：Grate outwells the clinker that thickness is 50-100mm；
（5）Dephosphorization treatment：Top blast oxygen flow 70-90Nm3/ min, oxygen lance position 1500-1700mm, bottom blowing nitrogen flow 6-
12Nm3/min；Nitrogen buffer gas, passive lime powder, passive lime powder injection amount 5- are persistently blown with spray gun into molten iron
10kg/min, is blown time 9-10min；Lime stone, the 15- of 10-12kg/t molten iron are added while being blown pulverized limestone into stove
The lime of 20kg/t molten iron and the iron oxide ball of 12.3-13.8kg/t molten iron；
（6）Tapping：Tapped after dephosphorization converter terminal point control, terminal point control condition is：Molten steel component contains C by percentage to the quality：
3.0-3.5%, Mn：0.15-0.25%, P：0.012-0.02%, other is Fe and residual impurity；1400-1450 DEG C of molten steel temperature.
2. a kind of technique of utilization lime stone smelting stainless steel in dephosphorization converter according to claim 1, its feature exists
In：Step（1）And step（5）Middle lime stone composition contains CaO by percentage to the quality：50-55%, SiO2：4-5%, MgO：1.2-
1.5%；Limestone granularity is 10-65mm.
3. a kind of technique of utilization lime stone smelting stainless steel in dephosphorization converter according to claim 1, its feature exists
In：Step（3）Fluorite in CaF2Content of MgO >=50% in content >=75%, light dolomite, granularity is 10-50mm.
4. a kind of technique of utilization lime stone smelting stainless steel in dephosphorization converter according to claim 1, its feature exists
In：Step（5）The granularity of middle iron oxide ball is 30-50mm.
5. a kind of technique of utilization lime stone smelting stainless steel in dephosphorization converter according to claim 1, its feature exists
In：Step（5）Effective CaO content >=88% in effective CaO content >=88% in middle passive lime powder, lime, granularity is 10-
50mm。
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| CN107164608A (en) * | 2017-05-19 | 2017-09-15 | 王冰 | A kind of preparation technology of smelting iron and steel stainless steel |
| CN109371200A (en) * | 2018-10-29 | 2019-02-22 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of smelting process making molten iron quick dephosphorization by converter bottom spray iron oxide red |
| CN110760639B (en) * | 2019-10-18 | 2021-09-28 | 甘肃酒钢集团宏兴钢铁股份有限公司 | System and method for steelmaking by spraying limestone powder to bottom of converter |
| CN114480775A (en) * | 2021-12-23 | 2022-05-13 | 武钢集团昆明钢铁股份有限公司 | Low-cost converter smelting process for slagging by limestone and raw dolomite |
| CN114480774A (en) * | 2021-12-23 | 2022-05-13 | 武钢集团昆明钢铁股份有限公司 | Method for smelting high-phosphorus molten iron by adopting limestone slagging process in converter |
| CN114410878B (en) * | 2021-12-23 | 2023-05-19 | 武钢集团昆明钢铁股份有限公司 | Converter molten iron smelting method adopting large-particle limestone to replace full-quantity lime slag formation |
| CN114635007B (en) * | 2022-03-31 | 2023-04-11 | 宝武集团鄂城钢铁有限公司 | Smelting method for improving dephosphorization rate at earlier stage of converter smelting |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86102862A (en) * | 1986-04-19 | 1987-04-15 | 徐寿浩 | Carry out the external desulfurization of hot metal method with steel-making high-temperature liquid state slag |
| US4662937A (en) * | 1984-05-28 | 1987-05-05 | Nippon Steel Corporation | Process for production of high-manganese iron alloy by smelting reduction |
| CN1850996A (en) * | 2006-05-10 | 2006-10-25 | 徐建明 | Method for direct making iron and steel by converter using waste iron and steel furnace burden |
| CN101525678A (en) * | 2009-04-21 | 2009-09-09 | 北京科技大学 | Method of replacing lime with limestone for slagging and producing steel in oxygen top blown converter |
| CN103773919A (en) * | 2014-02-18 | 2014-05-07 | 钢铁研究总院 | Method for smelting middle-high phosphorus molten iron in converter |
| CN104313309A (en) * | 2014-11-17 | 2015-01-28 | 中冶南方工程技术有限公司 | Technology and system for producing stainless steel by submerged arc furnace and AOD furnace duplex process |
-
2016
- 2016-03-16 CN CN201610149730.7A patent/CN105779682B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4662937A (en) * | 1984-05-28 | 1987-05-05 | Nippon Steel Corporation | Process for production of high-manganese iron alloy by smelting reduction |
| CN86102862A (en) * | 1986-04-19 | 1987-04-15 | 徐寿浩 | Carry out the external desulfurization of hot metal method with steel-making high-temperature liquid state slag |
| CN1850996A (en) * | 2006-05-10 | 2006-10-25 | 徐建明 | Method for direct making iron and steel by converter using waste iron and steel furnace burden |
| CN101525678A (en) * | 2009-04-21 | 2009-09-09 | 北京科技大学 | Method of replacing lime with limestone for slagging and producing steel in oxygen top blown converter |
| CN103773919A (en) * | 2014-02-18 | 2014-05-07 | 钢铁研究总院 | Method for smelting middle-high phosphorus molten iron in converter |
| CN104313309A (en) * | 2014-11-17 | 2015-01-28 | 中冶南方工程技术有限公司 | Technology and system for producing stainless steel by submerged arc furnace and AOD furnace duplex process |
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