CN105219912A - A kind of method regulating low alloy steel refining slag system basicity - Google Patents
A kind of method regulating low alloy steel refining slag system basicity Download PDFInfo
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- CN105219912A CN105219912A CN201510721906.7A CN201510721906A CN105219912A CN 105219912 A CN105219912 A CN 105219912A CN 201510721906 A CN201510721906 A CN 201510721906A CN 105219912 A CN105219912 A CN 105219912A
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Abstract
The invention discloses a kind of method regulating low alloy steel refining slag system basicity, it comprises converter smelting and refining process, the tapping stage of described converter smelting, adds vanadium slag 2.5 ~ 5kg/ ton steel with alloy material.Present method is by adopting working method that vanadium slag together adds with alloy material in tapping process, owing to containing the higher material such as silicon-dioxide, Vanadium Pentoxide in FLAKES in vanadium slag, basicity of slag in ladle is made to control below 3.5, improve the mobility of slag, shorten the change slag time in refining early stage, serve stably manufactured, reduce the result that dissolving agent uses.Meanwhile, by adding of vanadium slag, the content of vanadium in molten steel is significantly improved, content of vanadium improves 0.0105% ~ 0.021%, reduces the use of vanadium alloy material.
Description
Technical field
The invention belongs to metallurgical technology field, especially regulate the method for low alloy steel refining slag system basicity.
Background technology
Containing the element such as vanadium, titanium in the molten iron that smelting vanadium-titanium magnetite by blast furnace is produced, the duplex practice technique that steelmaking process is made steel after generally adopting first vanadium extraction.Vanadium extraction by converter blowing gained vanadium slag, containing materials such as calcium oxide, silicon-dioxide, Vanadium Pentoxide in FLAKES, ferric oxide.
Vanadium-containing low steel for preventing slag of tapping, causing back sulphur, rephosphorization to molten steel, requiring to add granule ash with alloy material in tapping process in smelting process; Such as hold steel 120 tons of converter systems and add granule ash 400kg/ stove with alloy material in tapping process.After converter tapping, molten steel enters refining link, because converter slag basicity is higher, and has again adding of granule ash, causes at refining process basicity of slag in early stage high, the disadvantageous effects such as viscosity is large, submerged arc weak effect, slag metallurgical effect difference.For improving slag fluidity, improving refining slag metallurgical effect, only having by adding dissolving agent to promote early stageization slag; But there is disadvantageous effects such as cylinder-packing being corroded to serious, increase slag charge cost in useization slag.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method promoting the adjustment low alloy steel refining slag system basicity of metallurgical effect.
For solving the problems of the technologies described above, the technical solution used in the present invention is: it comprises converter smelting and refining process, it is characterized in that: the tapping stage of described converter smelting, and adding with alloy material has vanadium slag 2.5 ~ 5kg/ ton steel.
Vanadiumcontent >=the 0.015wt% of vanadium-containing low steel of the present invention.
The beneficial effect that produces of technique scheme is adopted to be: the present invention is by adopting working method that vanadium slag together adds with alloy material in tapping process, owing to containing the higher material such as silicon-dioxide, Vanadium Pentoxide in FLAKES in vanadium slag, (refining early stage) basicity of slag in ladle is made to control below 3.5, improve the mobility of slag, shorten the change slag time in refining early stage, serve stably manufactured, reduce the result that dissolving agent uses.Meanwhile, by adding of vanadium slag, the content of vanadium in molten steel is significantly improved, content of vanadium improves 0.0105% ~ 0.021%, reduces the use of vanadium alloy material.
Embodiment
Below in conjunction with specific embodiment, the present invention is further detailed explanation.Following embodiment is based on the smelting process of 120 tons of converter system low alloy steel HRB400E, and the main component of the granule ash adopted and granularity are in table 1.
Table 1: granule ash main component, granularity (wt%)
The vanadium slag main component adopted is in table 2.
Table 2: the main component (wt%) of vanadium slag
Converter tapping process adds granule ash 400kg/ stove by regulation, and adds vanadium slag 2.5 ~ 5kg/ ton steel, and alloy addition adds by institute's steelmaking kind main points requirement; For preventing slag, refining uses floating plug early stage, and the refining later stage uses pushing off the slag target working method, and the lower quantity of slag controls at 4.3kg/t ~ 5.5kg/t, averages as 4.9kg/t, and tapping measures 120 tons/stove.Described refining process gets twice sample, is respectively front sample and middle sample; Before refining process gets front sample, be called that refining in earlier stage; The refining later stage is called after getting sample; Time between two sub-samplings is called refining mid-term.
Embodiment 1: the concrete technology of the method for this adjustment low alloy steel refining slag system basicity is as described below.
(1) to converter finishing slag main component result of laboratory test in table 3.
Table 3: converter finishing slag main component (wt%)
Bring into by converter slag:
[CaO]=120*4.9*39.78%=233.9kg；
[MgO]=120*4.9*16.85%=99.08kg；
[SiO
2]=120*4.9*6.379%=43.63kg。
(2) brought into by alloy material:
Alloy material add-on requires to add according to the main points of institute's steelmaking kind, and according to the enter the station composition of molten steel at LF stove, according to specific absorption, inverse goes out the amount of oxidation of Si element, and then the SiO calculated
2content.
Enter the station at refining procedure and get molten steel sample and the results are shown in Table 4.
Table 4: refining is entered the station molten steel main component (wt%)
Element silicon specific absorption gets 85%, then alloy material brings [SiO in slag into
2] amount be:
[SiO
2]=120*1000*0.17%/85%*15%*2.14=77.04kg。
(3) brought into by granule ash:
[CaO]=400*85.31%=341.24kg；
[MgO]=400*4.3%=17.2kg；
[SiO
2]=400*4.32%=16.92kg。
(4) add 600kg vanadium slag to bring into:
[CaO]=600*2.37%=14.22kg；
[SiO
2]=600*13.93%=83.58kg。
(4) theoretical basicity of slag R1 is calculated:
R1=(233.9+99.08+341.24+17.2+14.22)/(43.63+77.04+16.92+83.58)=705.64/221.17=3.2。
(5) actual refining procedure enters the station and gets slag slag sample analysis and the results are shown in Table 5.
Table 5: refining procedure enters the station and gets slag slag specimen main component (wt%)
Actual slag specimen basicity R2=([CaO]+[MgO])/[SiO
2]=(32.82+7.41)/13.83=2.9.
Vanadium slag specific absorption calculates by 80%, and Theoretical Calculation adds the increasing vanadium amount V%:V%=600*9.4%*56%*80%/120000=0.021% of molten steel after vanadium slag.Actual refining sampling in early stage detects molten steel vanadiumcontent in table 4.
Embodiment 2: the concrete technology of the method for this adjustment low alloy steel refining slag system basicity is as described below.
(1) to converter finishing slag main component result of laboratory test in table 6.
Table 6: converter finishing slag main component (wt%)
Bring into by converter slag:
[CaO]=120*4.9*37.54%=220.73kg；
[MgO]=120*4.9*13.67%=80.38kg；
[SiO
2]=120*4.9*8.99%=52.86kg。
(2) brought into by alloy material:
Actual refining procedure enters the station and gets molten steel sample analytical results in table 7.
Table 7: refining is entered the station molten steel main component (wt%)
Element silicon specific absorption gets 85%, then alloy material brings [SiO in slag into
2] amount be: [SiO
2]=120*1000*0.20%/85%*15%*2.14=90.64kg.
(3) brought into by granule ash:
[CaO]=400*85.31%=341.24kg；
[MgO]=400*4.3%=17.2kg；
[SiO
2]=400*4.32%=16.92kg。
(4) add 300kg vanadium slag to bring into:
[CaO]=300*2.37%=7.11kg；
[SiO
2]=300*13.93%=41.79kg。
(5) Theoretical Calculation basicity of slag R3:
R3=(220.73+80.38+341.24+17.2+7.11)/(52.86+90.64+16.92+41.79)=666.66/202.21=3.3。
(6) actual refining procedure enters the station and gets slag slag sample analysis and the results are shown in Table 8.
Table 8: refining procedure enters the station and gets slag slag specimen main component (wt%)
Slag specimen basicity R4=[CaO]+[MgO]/[SiO
2]=(32.15+7.25)/12.69=3.1.
Vanadium slag specific absorption calculates by 80%, and Theoretical Calculation adds the increasing vanadium amount V%:V%=300*9.4%*56%*80%/120000=0.0105% of molten steel after vanadium slag; Actual refining sampling in early stage detects molten steel composition content of vanadium in table 7.
Claims (2)
1. regulate a method for low alloy steel refining slag system basicity, it comprises converter smelting and refining process, it is characterized in that: the tapping stage of described converter smelting, and adding with alloy material has vanadium slag 2.5 ~ 5kg/ ton steel.
2. the method for adjustment low alloy steel refining slag system basicity according to claim 1 and 2, is characterized in that: the vanadiumcontent >=0.015wt% of described vanadium-containing low steel.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106282631A (en) * | 2016-10-25 | 2017-01-04 | 嘉善蓝欣涂料有限公司 | A kind of high fluidity copper-nickel alloy refining agent and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102304604A (en) * | 2011-08-31 | 2012-01-04 | 河北钢铁股份有限公司承德分公司 | Smelting technology of III grade hot-rolled ribbed bars |
| CN102605140A (en) * | 2012-03-05 | 2012-07-25 | 石家庄钢铁有限责任公司 | Manufacturing method of molybdenum or vanadium oxide briquetting for steelmaking alloying |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102304604A (en) * | 2011-08-31 | 2012-01-04 | 河北钢铁股份有限公司承德分公司 | Smelting technology of III grade hot-rolled ribbed bars |
| CN102605140A (en) * | 2012-03-05 | 2012-07-25 | 石家庄钢铁有限责任公司 | Manufacturing method of molybdenum or vanadium oxide briquetting for steelmaking alloying |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106282631A (en) * | 2016-10-25 | 2017-01-04 | 嘉善蓝欣涂料有限公司 | A kind of high fluidity copper-nickel alloy refining agent and preparation method thereof |
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