CN108624734A - A method of decarbonized slag circulatory stove number in control converter less-slag melting technique - Google Patents
A method of decarbonized slag circulatory stove number in control converter less-slag melting technique Download PDFInfo
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- CN108624734A CN108624734A CN201710152421.XA CN201710152421A CN108624734A CN 108624734 A CN108624734 A CN 108624734A CN 201710152421 A CN201710152421 A CN 201710152421A CN 108624734 A CN108624734 A CN 108624734A
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- China
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- slag
- converter
- desiliconization
- basicity
- steel
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Classifications
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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
- C21C5/35—Blowing from above and through the bath
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of method of decarbonized slag circulatory stove number in control converter less-slag melting technique, the carbon period clinker for mainly solving converter less-slag melting technique in the prior art recycles the not high technical problem of number.The technical scheme is that：A method of decarbonized slag circulatory stove number in control converter less-slag melting technique, including：Using the compound smelting in converter top bottom, the weight percent of the raw material composition of input metal major ingredient is molten iron 80~93%, and surplus is light-duty steel scrap；Bessemerize desiliconization, dephosphorization；Converter desiliconization carries out deslagging after the dephosphorization phase；Bessemerize decarburization；It taps after bessemerizing；It carries out staying slag and slag splashing successively after converter tapping.Using the method for the present invention, the continuous circulatory stove number of converter decarbonized slag can be stablized more than 6 stoves, and converter slag-making supplementary product onsumption declines 20%~40% compared to existing converter less-slag melting technique, further reduced smelting molten steel cost.
Description
Technical field
The present invention relates to a kind of method of converter smelting molten steel, more particularly to taken off in a kind of control converter less-slag melting technique
The method of carbon slag circulatory stove number belongs to smelting and the continuously casting technical field of steel.
Background technology
China's steel industry is quickly grown in the past 20 years, has played important function to national economy rapid growth, but saving
Solid waste discharges such as resource-saving, the energy and reduction clinker etc., are faced with huge pressure and challenge at present.In accounting for
For 90% or more oxygen converter steelmaking of state's steel output, about 6.2 hundred million tons of crude steel are produced every year, to generate 60,000,000 tons or more stoves
Slag consumes 31,000,000 tons or more lime and 7,000,000 tons or more light dolomite, and is used to produce steel-making lime and light dolomite
Lime stone and unprocessed dolomite mineral products be important non-renewable resources.
The traditional slagging process of converter smelting can be divided mainly into 3 kinds of single slag process, double slag process, duplex practice techniques.Single slag process
Lime consumption and molten iron initial silicon content are in close relations, generally in 30~50kg/ tons of steel, the quantity of slag of generation generally 100~
120kg/ tons of steel；Double slag process, which is smelted, usually to be adopted in the case where molten iron silicon content is higher or phosphorus content is higher or low phosphorus steel by smelting
With converter supplementary product onsumption is higher than single slag process；Although duplex practice can reduce the consumption of supplementary material, additional increase specially is needed
It for the converter of dephosphorization, and taps a blast furnace after dephosphorization and increases hot metal temperature drop, and molten iron is equivalent to half steel after dephosphorization, to follow-up
Smelting increases burden with slagging process.
2001, nippon company developed completely new converter steelmaking process, i.e. MURC (Multi-refining
Converter) converter steelmaking process, technological process are：Steel scrap is added, is blended into molten iron → converter desiliconization, dephosphorization → row early period
Dephosphorized slag → blowing decarburization heating → converter tapping → stays decarbonized slag and is recycled to next stove；The technique passes through converter " double slags+stay
Slag " is smelted, and can significantly reduce the consumption of converter slag-making auxiliary material, industry is interior, and smelting process is again by converter " double slags+stay slag "
Referred to as converter less-slag melting technique.But common problem has in practice process：(1) decarbonized slag stays slag rate not high, turns
After stove is tapped, discharge section clinker is often wanted, then carries out slag splashing again；(2) when decarbonized slag recycles, desiliconization, dephosphorization
Phase generally requires that part slag making auxiliary material is added；(3) phosphorus content is progressively enriched with decarbonized slag in slag during recycling, in order to protect
Card terminal phosphorus is met the requirements, at present country's decarbonized slag to recycle number relatively low, be generally no more than 3 stoves.These factors limit
The further decreasing of converter slag-making supplementary product onsumption.
The Chinese patent application of application publication number CN102212643A discloses a kind of converter less-slag melting technique, the patent
File is described less-slag melting technique；The Chinese patent application of application publication number CN102965466A discloses one kind and carries
The technique of high converter in stage deslagging amount, which discloses realizes that early period falls by the control of slag fluidity
Slag；Above-mentioned patent be not directed to how to control decarbonized slag recycle problem.Related patents are inquired, are not found few about control
Patent in terms of slag melting circulatory stove number.
Invention content
The object of the present invention is to provide a kind of methods of decarbonized slag circulatory stove number in control converter less-slag melting technique, mainly
The carbon period clinker for solving converter less-slag melting technique in the prior art recycles the not high technical problem of number.
The technical solution adopted by the present invention is：A kind of side controlling decarbonized slag circulatory stove number in converter less-slag melting technique
Method includes the following steps：
1) use the compound smelting in converter top bottom, input metal major ingredient raw material composition weight percent be molten iron 80~
93%, surplus is light-duty steel scrap；
2) bessemerize desiliconization, dephosphorization, converter desiliconization, the oxygen-supplying amount of dephosphorization phase be smelt the total oxygen-supplying amount of heat 25%~
35%；Desiliconization is bessemerized in control, the basicity of slag of dephosphorization phase is 1.3~1.9；The mass percent of magnesia is in clinker
4%~7%；The mass percent of full iron is 15%~25% in clinker；Bath temperature is 1350~1430 DEG C；Desiliconization, dephosphorization
Phase lime adding amount is 0~20kg/ tons of steel；Light dolomite addition is 0~12kg/ tons of steel；Ore addition be 0~
40kg/ tons of steel；
3) converter desiliconization, carry out deslagging after the dephosphorization phase, control desiliconization, dephosphorized slag stay the quantity of slag≤desiliconization, dephosphorization phase slag
The 50% of amount；
4) decarburization is bessemerized, the oxygen-supplying amount of carbon period is smelt the total oxygen-supplying amount of heat 65%~75%；Control converter
The basicity of slag of blowing carbon period is 3.5~4.5；The mass percent of magnesia is 8%~11% in clinker；Full iron in clinker
Mass percent be 15%~25%；Bath temperature is 1620~1700 DEG C；Carbon period lime adding amount is 5~15kg/ tons
Steel, light dolomite addition are 5~25kg/ tons of steel；Ore addition is 0~10kg/ tons of steel；
5) it taps after bessemerizing；
6) it carries out staying slag and slag splashing successively after converter tapping, control decarbonized slag stays the quantity of slag so that Xia Yilu
The quantity of slag≤110kg/ tons of steel of secondary desiliconization, dephosphorization phase.
Step of the present invention is repeated, the smelting of next stove molten steel is started.
In step 2) of the present invention, when converter desiliconization, dephosphorization phase blow, according to the mass percent of element silicon in molten iron, control
System bessemerizes desiliconization, the basicity of slag of dephosphorization phase, specifically, working as w [Si]<When 0.2%, basicity of slag 1.9；When 0.2%
≤w[Si]<When 0.3%, basicity of slag 1.8；As 0.3%≤w [Si]<When 0.4%, basicity of slag 1.7；As 0.4%≤w
[Si]<When 0.5%, basicity of slag 1.6；As 0.5%≤w [Si]<When 0.6%, basicity of slag 1.5；As 0.6%≤w
[Si]<When 0.7%, basicity of slag 1.4；As w [Si] >=0.7%, basicity of slag 1.3.
Further, in step 4) of the present invention, when converter carbon period blows, carbon period clinker is bessemerized according to current heat
The quality of middle silica and next heat bessemerize desiliconization, dephosphorization phase silica quality, control bessemerizes decarburization
The basicity of slag of phase, the basicity of slag for bessemerizing carbon period are calculated by formula one, R=(1+Q (SiO2)1/Q(SiO2))×R1
Formula one, wherein R is the basicity of slag for bessemerizing carbon period；Q(SiO2)1Desiliconization, dephosphorization phase are bessemerized for next heat
Clinker in silica quality, units/kg/ton steel；Q(SiO2) it is that current heat is bessemerized two in the clinker of carbon period
The quality of silica, units/kg/ton steel；R1Desiliconization, the basicity of slag of dephosphorization phase are bessemerized for next heat.
The present invention is by converter desiliconization, the smelting of dephosphorization phase, controlling desiliconization, the basicity of the clinker of dephosphorization phase, the quantity of slag, temperature
The quantity of slag is stayed in degree and desiliconization, dephosphorized slag；When carbon period is smelted, the basicity and decarbonized slag that control carbon period clinker stay slag
Amount；The continuous circulatory stove number of decarbonized slag is stablized more than 6 stoves.
The present invention has following good effect compared with prior art：1, using the method for the present invention, converter decarbonized slag it is continuous
Circulatory stove number can be stablized more than 6 stoves, provide guarantee for the continuity of the method for the present invention, quality control is stablized.2, it uses
The method of the present invention, converter slag-making supplementary product onsumption decline 20%~40% compared to existing converter less-slag melting technique, further decrease
Smelting molten steel cost.
Description of the drawings
Fig. 1 is the relational graph of the slag making supplementary product onsumption and clinker circulatory stove number of embodiment 1
Fig. 2 is the relational graph of slag gold distribution ratio (Lp=(%P)/[%P]) and clinker circulatory stove number of the phosphorus of embodiment 1
Specific implementation mode
With reference to specific embodiment, invention is further explained.
The embodiment as shown in table 1 to table 4, with 150 tons of the top and bottom combined blown converter smelting trade mark for 340CQ-1 car inner plates
For steel, converter steelmaking process bottom blown gas is argon gas；On 150 tons of top and bottom combined blown converters using converter less-slag melting technique into
Row steel-making, includes the following steps：Steel scrap is added, is blended into molten iron → converter desiliconization, dephosphorization → row's dephosphorized slag early period → blowing decarburization
Heating → converter tapping → stays decarbonized slag and is recycled to next stove.
1 converter smelting metal charge parameter of the embodiment of the present invention of table
2 converter smelting of embodiment of the present invention desiliconization of table, dephosphorization phase converting process parameter
3 converter smelting carbon period converting process parameter of the embodiment of the present invention of table
4 finished steel of embodiment of the present invention water chemical elements of table and cleanliness factor parameter
As shown in Figure 1, with the increase of cycle-index, converter slag-making supplementary product onsumption is basicly stable, and desiliconization, dephosphorization phase are basic
Without being added slag making auxiliary material, the increase of the continuous circulatory stove number of decarbonized slag, the effect of less-slag melting can be played to greatest extent.Such as figure
Shown in 2, the increase of the continuous circulatory stove number of decarbonized slag, phosphorus content is progressively enriched in clinker, and the slag gold distribution ratio of phosphorus gradually increases, when
When phosphorus content is enriched with to a certain extent, continuously cycle is forced to terminate decarbonized slag.The converter slag-making material auxiliary material of the embodiment of the present invention 1 disappears
Consumption declines 30% or so compared to existing converter less-slag melting technique.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (3)
1. a kind of method of decarbonized slag circulatory stove number in control converter less-slag melting technique, characterized in that the method includes
Following steps：
1) the compound smelting in converter top bottom is used, the weight percent of the raw material composition of input metal major ingredient is molten iron 80~93%,
Surplus is light-duty steel scrap；
2) bessemerize desiliconization, dephosphorization, converter desiliconization, the oxygen-supplying amount of dephosphorization phase be smelt the total oxygen-supplying amount of heat 25%~
35%；Desiliconization is bessemerized in control, the basicity of slag of dephosphorization phase is 1.3~1.9；The mass percent of magnesia is in clinker
4%~7%；The mass percent of full iron is 15%~25% in clinker；Bath temperature is 1350~1430 DEG C；Desiliconization, dephosphorization
Phase lime adding amount is 0~20kg/ tons of steel；Light dolomite addition is 0~12kg/ tons of steel；Ore addition be 0~
40kg/ tons of steel；
3) converter desiliconization, carry out deslagging after the dephosphorization phase, the quantity of slag≤desiliconization, the dephosphorization phase quantity of slag are stayed in control desiliconization, dephosphorized slag
50%；
4) decarburization is bessemerized, the oxygen-supplying amount of carbon period is smelt the total oxygen-supplying amount of heat 65%~75%；Control is bessemerized
The basicity of slag of carbon period is 3.5~4.5；The mass percent of magnesia is 8%~11% in clinker；The matter of full iron in clinker
It is 15%~25% to measure percentage；Bath temperature is 1620~1700 DEG C；Carbon period lime adding amount is 5~15kg/ tons of steel, gently
Calcined dolomite addition is 5~25kg/ tons of steel；Ore addition is 0~10kg/ tons of steel；
5) it taps after bessemerizing；
6) it carries out staying slag and slag splashing successively after converter tapping, control decarbonized slag stays the quantity of slag so that next heat
Desiliconization, the quantity of slag≤110kg/ tons of steel of dephosphorization phase.
2. the method for decarbonized slag circulatory stove number, feature in a kind of control converter less-slag melting technique as described in claim 1
It is that when converter desiliconization, dephosphorization phase blow, according to the mass percent of element silicon in molten iron, desiliconization, dephosphorization phase are bessemerized in control
Basicity of slag, specifically, work as w [Si]<When 0.2%, basicity of slag 1.9；As 0.2%≤w [Si]<When 0.3%, clinker alkali
Degree is 1.8；As 0.3%≤w [Si]<When 0.4%, basicity of slag 1.7；As 0.4%≤w [Si]<When 0.5%, basicity of slag
It is 1.6；As 0.5%≤w [Si]<When 0.6%, basicity of slag 1.5；As 0.6%≤w [Si]<When 0.7%, basicity of slag is
1.4；As w [Si] >=0.7%, basicity of slag 1.3.
3. the method for decarbonized slag circulatory stove number, feature in a kind of control converter less-slag melting technique as described in claim 1
It is that when converter carbon period blows, the quality of silica and next heat in carbon period clinker are bessemerized according to current heat
Bessemerize desiliconization, dephosphorization phase silica quality, control bessemerizes the basicity of slag of carbon period, bessemerizes carbon period
Basicity of slag by formula one calculate, R=(1+Q (SiO2)1/Q(SiO2))×R1Formula one, wherein R is to bessemerize decarburization
The basicity of slag of phase；Q(SiO2)1The quality of silica in desiliconization, the clinker of dephosphorization phase, unit are bessemerized for next heat
Kg/ tons of steel；Q(SiO2) it is the quality that current heat bessemerizes silica in the clinker of carbon period, units/kg/ton steel；R1For
Next heat bessemerizes desiliconization, the basicity of slag of dephosphorization phase.
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| CN201710152421.XA CN108624734A (en) | 2017-03-15 | 2017-03-15 | A method of decarbonized slag circulatory stove number in control converter less-slag melting technique |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112708717A (en) * | 2020-12-15 | 2021-04-27 | 阳春新钢铁有限责任公司 | Method for smelting low-phosphorus molten steel by single-converter duplex method |
| CN112779378A (en) * | 2020-12-15 | 2021-05-11 | 阳春新钢铁有限责任公司 | Low-iron-consumption duplex less-slag smelting method for single converter |
| CN115109887A (en) * | 2022-07-20 | 2022-09-27 | 北京科技大学 | Converter smelting process selection method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112708717A (en) * | 2020-12-15 | 2021-04-27 | 阳春新钢铁有限责任公司 | Method for smelting low-phosphorus molten steel by single-converter duplex method |
| CN112779378A (en) * | 2020-12-15 | 2021-05-11 | 阳春新钢铁有限责任公司 | Low-iron-consumption duplex less-slag smelting method for single converter |
| CN115109887A (en) * | 2022-07-20 | 2022-09-27 | 北京科技大学 | Converter smelting process selection method |
| CN115109887B (en) * | 2022-07-20 | 2023-07-28 | 北京科技大学 | Converter smelting process selection method |
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Application publication date: 20181009 |