CN104099440B - Semi-steel making flue dust control method and Semi-steel making method - Google Patents
Semi-steel making flue dust control method and Semi-steel making method Download PDFInfo
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- CN104099440B CN104099440B CN201410371576.9A CN201410371576A CN104099440B CN 104099440 B CN104099440 B CN 104099440B CN 201410371576 A CN201410371576 A CN 201410371576A CN 104099440 B CN104099440 B CN 104099440B
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Abstract
The present invention relates to a kind of method of semi-steel making flue dust control method and semi-steel making, belong to field of metallurgy.The invention provides a kind of semi-steel making flue dust control method, in semi-steel making technique, comprise the steps: that a) vanadium extraction is going out in the process of half steel to ladle after terminating, add ferrosilicon or silicon carbide, the add-on of ferrosilicon or silicon carbide is 0.5 ~ 1.0kg/t half steel; And control vanadium extraction terminal oxygen activity 5 × 10
6~ 20 × 10
6, vanadium extraction terminal temperature is 1360 ~ 1400 DEG C; The processing condition of half steel terminal are: go out half steel time 1.0 ~ 2.0s/t half steel; The lower quantity of slag 0.7 ~ 3.8kg/t
half steel; B) go out after half steel terminates and add 0.5 ~ 1.0kg/t
half steelinsulating covering agent, insulating covering agent main component is: SiO
230 ~ 45%, Al
2o
35 ~ 20%, Fe
2o
35 ~ 30%, MgO10 ~ 25%.Method of the present invention can not only reduce the flue dust of semi-steel after extraction of vanadium steel-making, and what improve vanadium slag pulls out slag performance simultaneously.
Description
Technical field
The present invention relates to a kind of method of semi-steel making flue dust control method and semi-steel making, belong to field of metallurgy.
Background technology
The process of semi-steel making mainly comprises: vanadium-bearing hot metal obtains half steel by vanadium extraction by converter blowing, and half steel obtains molten steel through converter steelmaking, ladle refining, then obtains continuously cast bloom through continuous casting.
When adopting vanadium titano-magnetite steel-making, because vanadium in steel, titanium content are higher, therefore before converter steelmaking, also will carry out vanadium extraction steel-making to molten iron, semi-steel after extraction of vanadium oxygen activity is 5 ~ 20 × 10
6, go out half steel process owing to there is reaction between carbon and oxygen, reaction product is carbon dioxide, causes half cylinder of steel to produce a large amount of flue dust, pollutes environment; In addition, because vanadium extraction is oxidizing reaction, vanadium slag oxidisability is very high, and viscosity is comparatively large, and slag steel is not easily separated, pulls out slag difficulty after causing stove.
The relevant report about the flue dust produced after how reducing semi-steel making vanadium extraction is not yet had in prior art.
Summary of the invention
The present invention is directed to above-mentioned defect, provide a kind of semi-steel making flue dust control method, the method can not only reduce the flue dust of semi-steel after extraction of vanadium steel-making, and what improve vanadium slag pulls out slag performance simultaneously.
Technical scheme of the present invention:
The invention provides a kind of semi-steel making flue dust control method, in semi-steel making technique, to go out half steel process and go out half steel terminate after technique control, be specially:
Going out in the process of half steel to ladle after vanadium extraction terminates, adding ferrosilicon or silicon carbide, the add-on of ferrosilicon or silicon carbide is 0.5 ~ 1.0kg/t
half steel; And control vanadium extraction terminal oxygen activity 5 × 10
6~ 20 × 10
6, vanadium extraction terminal temperature is 1360 ~ 1400 DEG C; The processing condition of half steel terminal are: go out half steel time 1.0 ~ 2.0s/t
half steel, the lower quantity of slag 0.7 ~ 3.8kg/t
half steel;
Go out after half steel terminates and add 0.5 ~ 1.0kg/t
half steelinsulating covering agent, insulating covering agent composition comprises: SiO
230 ~ 45%, Al
2o
35 ~ 20%, Fe
2o
35 ~ 30%, MgO10 ~ 25%.
Described half steel is the molten steel of vanadium titano-magnetite after desulfurization vanadium extraction, and it contains the C of 3.2-4.0% by weight percentage.
Preferably, when carbon content is 3.6-4.0% in half steel, ferrosilicon is added; When carbon content is 3.2-3.5% in half steel, add silicon carbide.
A kind of Semi-steel making method, described Semi-steel making method comprises employing aforesaid method of the present invention to control the flue dust after vanadium extraction.
Beneficial effect of the present invention:
The invention provides a kind of novel method reducing semi-steel after extraction of vanadium tank flue dust, the method has also certainly separated the problem that vanadium slag pulls out slag difficulty simultaneously.In half cylinder of steel, add ferrosilicon or silicon carbide when the method starts by going out half steel after vanadium extraction terminates, the oxygen in itself and half steel is fully reacted.From the oxygen gesture figure of oxide compound, at the temperature of 1300 ~ 1400 DEG C, silicon is more easily combined with oxygen compared with carbon and generates stable oxide compound; The reaction product generated is liquid Si O
2, because its density is much little compared with molten steel, float up to half cylinder of steel surface and enter into slag, therefore both reduced the viscosity of remaining vanadium slag in half cylinder of steel, meanwhile, it also avoid the problem that flue dust after stove is larger.When going out half steel after present invention efficiently solves vanadium extraction by converter blowing, after stove, flue dust is comparatively large, and the problem that environmental pollution is more serious, what improve vanadium slag pulls out slag performance simultaneously.
Embodiment
The invention provides a kind of semi-steel making flue dust control method, in existing semi-steel making technique, also comprise the steps:
A) vanadium extraction is going out in the process of half steel to ladle after terminating, and adds ferrosilicon or silicon carbide, and the add-on of ferrosilicon or silicon carbide is 0.5 ~ 1.0kg/t
half steel; And control vanadium extraction terminal oxygen activity 5 × 10
6~ 20 × 10
6, vanadium extraction terminal temperature is 1360 ~ 1400 DEG C; The processing condition of half steel terminal are: go out half steel time 1.0 ~ 2.0s/t
half steel, the lower quantity of slag 0.7 ~ 3.8kg/t
half steel, half steel terminal temperature 1360-1390 DEG C, oxygen activity is 3 × 10
6~ 4 × 10
6;
B) go out after half steel terminates and add 0.5 ~ 1.0kg/t
half steelinsulating covering agent, insulating covering agent main component is: SiO
230 ~ 45%, Al
2o
35 ~ 20%, Fe
2o
35 ~ 30%, MgO10 ~ 25%.
In step a, the add-on of ferrosilicon or silicon carbide is determined according to the flue dust situation of half steel, and generally according to half steel oxygen activity determination add-on, add-on is excessive does not have negative impact, but there is cost of alloy problem and melt homogeneity question; The restriction half steel tapping time is to allow ferrosilicon etc. fully react with the oxygen in half steel, and oxygen activity and terminal temperature, the lower quantity of slag etc. have impact for the grade of vanadium slag after vanadium extraction and yield etc.; Therefore limited at this.The slag ingredient the adding of insulating covering agent being conducive to adjusting half steel further and insulation effect is carried out to half steel.
Going out in half steel process, utilize half steel reinforced concrete punching that oxygen in ferrosilicon/silicon carbide and half steel is fully reacted, the reaction product of generation is SiO
2, because its density is much little compared with molten steel, float up to half cylinder of steel surface and enter into half slag (vanadium slag); Thus the carbon deoxidation in steel can be replaced, deoxidation products SiO simultaneously
2enter into slag, reduce the viscosity of slag, vanadium slag is more easily pulled out.
Described half steel is the molten steel of vanadium titano-magnetite after desulfurization vanadium extraction, and it contains the Si of C, 0-0.03% of 3.2-4.0% by weight percentage.
When carbon content in half steel is 3.6-4.0%, add ferrosilicon; When carbon content in half steel is 3.2-3.5%, add silicon carbide.
A kind of Semi-steel making method, described Semi-steel making method comprises employing aforesaid method of the present invention to control the flue dust after vanadium extraction.
Need to illustrate, in the present invention, half steel is the molten steel of vanadium titano-magnetite after desulfurization vanadium extraction, and wherein, the mass percentage of carbon is 3.2-4%, and silicon, manganese heating element content are negligible.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1 ~ 4 is mainly enumerated and is adopted the inventive method to process the half steel after vanadium extraction, reduces and the method that half steel process and half cylinder of steel flue dust and raising pull out slag performance.
Ferrosilicon composition is: the silicone content of 75%; Silicon carbide contents is: the silicone content of 56%, the carbon content of 24%;
Insulating covering agent main component is: SiO
230 ~ 45%, Al
2o
35 ~ 20%, Fe
2o
35 ~ 30%, MgO10 ~ 25%.
Embodiment 1
Adopt existing process for extracting vanadium, just in vanadium extraction operation, before going out half steel, control half steel oxygen activity 10 × 10
6, vanadium extraction terminal temperature is 1390 DEG C, goes out when half steel starts and add ferrosilicon 0.5kg/t after vanadium extraction in half cylinder of steel
half steel, utilize mixed punching that oxygen in the silicon in ferrosilicon and half steel is fully reacted.
The technique simultaneously controlling half steel terminal is: go out half steel time 1.0s/t after vanadium extraction
half steel, lower quantity of slag 1.4kg/t
half steel, half steel terminal temperature is 1380 DEG C, oxygen activity 3 × 10
6, go out half steel and terminate backward half cylinder of steel surface and add insulating covering agent 1.0kg/t
half steel.Experiment finds, goes out flue dust in half steel process and half cylinder of steel less, pulls out slag better performances.
Embodiment 2
Adopt existing process for extracting vanadium, just in vanadium extraction operation, before going out half steel, control vanadium extraction terminal half steel oxygen activity 20 × 10
6, vanadium extraction terminal temperature is 1377 DEG C, goes out half steel and start to add ferrosilicon 1.0kg/t in half cylinder of steel after vanadium extraction
half steel, utilize mixed punching that oxygen in the silicon in ferrosilicon and half steel is fully reacted.
The technique controlling half steel terminal is: go out half steel time 2.0s/t half steel after vanadium extraction, lower quantity of slag 2.3kg/t
half steel, half steel terminal temperature is 1370 DEG C of molten steel, oxygen activity 4 × 10
6, go out half steel and terminate backward half cylinder of steel surface and add insulating covering agent 0.5kg/t
half steel, go out half steel process and half cylinder of steel flue dust is less, pull out slag better performances.
Embodiment 3
Adopt existing process for extracting vanadium, just in vanadium extraction operation, before going out half steel, control half steel oxygen activity 10 × 10
6, vanadium extraction terminal temperature is 1400 DEG C, goes out half steel and start to add silicon carbide 0.5kg/t in half cylinder of steel after vanadium extraction
half steel, utilize mixed punching that oxygen in the silicon in ferrosilicon and half steel is fully reacted.
The technique controlling half steel terminal is: go out half steel time 1.0s/t after vanadium extraction
half steel, lower quantity of slag 0.7kg/t
half steel, half steel terminal temperature is 1390 DEG C of molten steel, oxygen activity 4 × 10
6, go out half steel and terminate backward half cylinder of steel surface and add insulating covering agent 1.0kg/t
half steel, go out half steel process and half cylinder of steel flue dust is less, pull out slag better performances.
Embodiment 4
Adopt existing process for extracting vanadium, just in vanadium extraction operation, before going out half steel, control half steel oxygen activity 20 × 10
6, vanadium extraction terminal temperature is 1368 DEG C, goes out half steel and start to add silicon carbide 1.0kg/t in half cylinder of steel after vanadium extraction
half steel, utilize mixed punching that oxygen in the silicon in ferrosilicon and half steel is fully reacted.
The technique controlling half steel terminal is: go out half steel time 2.0s/t after vanadium extraction
half steel, lower quantity of slag 2.0kg/t
half steel, half steel terminal temperature is 1360 DEG C of molten steel, oxygen activity 3 × 10
6, go out half steel and terminate backward half cylinder of steel surface and add insulating covering agent 0.5kg/t
half steel, go out half steel process and half cylinder of steel flue dust is less, pull out slag better performances.
Comparative example 1:
Adopt existing process for extracting vanadium, just in vanadium extraction operation, before going out half steel, control half steel oxygen activity 20 × 10
6, vanadium extraction terminal temperature is 1370 DEG C, goes out half steel and start to add insulating covering agent 2.0kg/t in half cylinder of steel after vanadium extraction
half steel.
The technique controlling half steel terminal is: go out half steel time 2.0s/t after vanadium extraction
half steel, lower quantity of slag 2.3kg/t
half steel, half steel terminal temperature is 1355 DEG C, oxygen activity 3 × 10
6, go out half steel process and half cylinder of steel flue dust comparatively large, pull out slag poor-performing.
Comparative example 2
Adopt existing process for extracting vanadium, just in vanadium extraction operation, before going out half steel, control half steel oxygen activity 20 × 10
6, vanadium extraction terminal temperature is 1370 DEG C, goes out half steel and start to add insulating covering agent 2.0kg/t in half cylinder of steel after vanadium extraction
half steel.
The technique controlling half steel terminal is: go out half steel time 0.7s/t after vanadium extraction
half steel, lower quantity of slag 4.5kg/t
half steel, half steel terminal temperature is 1355 DEG C of molten steel, oxygen activity 20 × 10
6.Go out half steel to terminate backward half cylinder of steel surface and add insulating covering agent 0.5kg/t half steel, go out half steel process and half cylinder of steel flue dust is comparatively large, pull out slag poor-performing.
Claims (4)
1. semi-steel making flue dust control method, is characterized in that, in semi-steel making technique, to go out half steel process and go out half steel terminate after technique control:
Go out after vanadium extraction terminates when half steel starts and add ferrosilicon or silicon carbide in half cylinder of steel, the add-on of ferrosilicon or silicon carbide is 0.5 ~ 1.0kg/t
half steel; And control vanadium extraction terminal oxygen activity 5 × 10
6~ 20 × 10
6, vanadium extraction terminal temperature is 1360 ~ 1400 DEG C; The processing condition of half steel terminal are: go out half steel time 1.0 ~ 2.0s/t
half steel, the lower quantity of slag 0.7 ~ 3.8kg/t
half steel;
Go out after half steel terminates and add 0.5 ~ 1.0kg/t
half steelinsulating covering agent, insulating covering agent composition comprises: SiO
230 ~ 45%, Al
2o
35 ~ 20%, Fe
2o
35 ~ 30%, MgO10 ~ 25%.
2. semi-steel making flue dust control method according to claim 1, is characterized in that, described half steel is the molten steel of vanadium-bearing hot metal after converter extracting vanadium, and its C content is 3.2-4.0% by weight percentage.
3. semi-steel making flue dust control method according to claim 2, is characterized in that, when C content is 3.6-4.0% in half steel, add ferrosilicon; When C content is 3.2-3.5% in half steel, add silicon carbide.
4. Semi-steel making method, is characterized in that, comprises and adopts control method described in any one of claim 1-3 to control the flue dust after semi-steel making vanadium extraction.
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| CN105063270B (en) * | 2015-08-04 | 2017-08-29 | 攀钢集团攀枝花钢铁研究院有限公司 | The method for reducing semi-steel making flue dust |
| CN105063271A (en) * | 2015-09-08 | 2015-11-18 | 攀钢集团西昌钢钒有限公司 | Pig-iron ladle environment-friendly dust removal method |
| CN106048128B (en) * | 2016-08-15 | 2018-04-20 | 攀钢集团西昌钢钒有限公司 | It is a kind of to prevent semi-steel making converter dry dust pelletizing system from opening to be blown off quick-fried method |
| CN110184406A (en) * | 2019-07-12 | 2019-08-30 | 河钢股份有限公司承德分公司 | A kind of method for making steel for improving steel scrap and ratio being added |
| CN112301181B (en) * | 2020-09-21 | 2022-05-24 | 河钢股份有限公司承德分公司 | Method for inhibiting generation of vanadium extraction semisteel smoke dust |
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| CN102912068A (en) * | 2012-10-19 | 2013-02-06 | 攀钢集团攀枝花钢钒有限公司 | Slagging constituent for semisteel converter steelmaking and manufacturing method thereof |
| CN103205524A (en) * | 2013-04-15 | 2013-07-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting low-sulfur steel from semi-steel |
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| CN102912068A (en) * | 2012-10-19 | 2013-02-06 | 攀钢集团攀枝花钢钒有限公司 | Slagging constituent for semisteel converter steelmaking and manufacturing method thereof |
| CN103205524A (en) * | 2013-04-15 | 2013-07-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting low-sulfur steel from semi-steel |
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