CN105063270B - The method for reducing semi-steel making flue dust - Google Patents
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- CN105063270B CN105063270B CN201510470854.0A CN201510470854A CN105063270B CN 105063270 B CN105063270 B CN 105063270B CN 201510470854 A CN201510470854 A CN 201510470854A CN 105063270 B CN105063270 B CN 105063270B
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Abstract
The invention belongs to metallurgical technology field, and in particular to the method for soot emissions is reduced in a kind of semisteel smelting technique.The method of present invention reduction semi-steel making flue dust, it is mainly included in vanadium extraction tapping process to use steelmaking converter after terminating half steel progress deoxidation treatment and pneumatic steelmaking tapping and stays slag PROCESS FOR TREATMENT, and deoxidation modification is carried out to the slag in stove before half steel is blended into staying slag technique.Present invention process can significantly reduce the flue dust produced during semi-steel making, and slag technique is stayed due to being employed after tapping terminates to converter, can substantially reduce auxiliary material and steel technology, reduce technique, so as to save the energy, reduce production cost.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to the method for soot emissions is reduced in a kind of semisteel smelting technique.
Background technology
For metallurgical industry current practice, flue dust accounts for pollution atmosphere pollution first place, and it has a large capacity and a wide range, Ji Hu
There is generation in all production technologies.Flue dust refers generally to the particulate matter of burning and exhausting, generally containing unburned charcoal
Grain, its granularity of the flue dust of metallurgical furnace discharge is most of below 1 μm.Exhausted air quantity is big, fine size, temperature height, complicated component etc.
Factor brings very big difficulty to flue dust control technology.The amount of dust discharged according to foreign countries to steel and iron industry is thought：Material transportation
30.9% is accounted for, steel-making accounts for 25.3%, and coking accounts for 16.7%, and sintering accounts for 12.9%, and other account for 14.2%.Pneumatic steelmaking and electric furnace refining
The yield of steel flue dust is respectively 7~15kg/t and 10~20kg/t.Fume from steel making has discharge capacity big, pollutes wide, type
Complexity, the features such as particle is tiny.Task weight, the difficulty for administering fume from steel making are big, but from the point of view of comprehensive utilization of resources angle, steel-making
Flue dust composition enriches, and many fine solid particles tend to make raw material, and containing various metallic elements, can reclaim or directly follow
Ring is utilized.
Steel industry is the basic activity of China's economic construction, while it is environmental pollution rich and influential family again, particularly air is dirty
Dye problem is in the more aobvious protrusion of this industry.Do a good job of it the environmental improvement of steel industry, particularly atmosphere pollution environmental improvement, current
In the case that national environmental pollution situation is still severe, with more important realistic meaning.
Pneumatic steelmaking no matter heat size size and use which kind of flow, its basic working procedure and pollution node have similarity.
In pneumatic steelmaking pollution node, stock preparation system such as blanking bin, belt transport have obturator and dust pelletizing system, typically control
Manage effect preferably, belong to and discharge in a organized way.Flue gas of converter and secondary flue gas have flue gas trapping and purifier, Neng Goufang
Only flue gas is excessive.But, converter tapping process and iron making process, hot-metal bottle can produce substantial amounts of flue dust, and this link is by technique bar
The limitation of part, volume of smoke can not be trapped effectively, belong to uncontrollable discharge, can cause the pollution of environment.Semi-steel making enterprise by
In vanadium extraction to be carried out, the recycling of vanadium resource is realized, flue dust is larger when being tapped after vanadium extraction；Half steel after vanadium extraction is blended into steel-making again
Converter is made steel, simultaneously because steelmaking converter stays the popularization and application of slag technique, when converter is blended into half steel in half steel in carbon and slag
FeO reactions produce a large amount of CO gases and excluded with fire door, so as to cause environmental pollution.Vanadium extraction for a long time goes out half steel and steelmaking converter
The problem of flue dust is big when being blended into half steel can not solve always, so controlling the method for flue dust extremely during providing a kind of semisteel smelting
Close important.
Application No. " 201410371576.9 ", entitled " semi-steel making flue dust control method and semi-steel making side
Method ", is disclosed after a kind of vanadium extraction terminates during half steel is gone out into ladle, adds ferrosilicon or carborundum, and controls to carry
Vanadium terminal oxygen activity and vanadium extraction outlet temperature；Coverture etc. is added after half steel terminates again, by controlling out half steel process and going out
Steel terminates rear some processes, to reach the content of flue dust in control half steel.The patent technique needs the parameter controlled more so that
Technique is more complicated；Added coverture is SiO2、Al2O3、Fe2O3, MgO, improve the production cost in half steel production technology, should
The situation of flue dust when the half steel that patent does not specify after vanadium extraction is blended into steelmaking converter, and add after coverture when being blended into steelmaking converter
Bigger flue dust can be produced.
The content of the invention
The technical problems to be solved by the invention are to provide that a kind of technique is simpler, cost is lower, can effectively reduce by half
The method of steel fume from steel making.
The method of present invention reduction semi-steel making flue dust, is mainly included in vanadium extraction stove tapping process and carries out deoxidation to half steel
Processing and steelmaking converter tapping use to steelmaking converter after terminating and stay slag PROCESS FOR TREATMENT, and right before half steel is blended into staying slag technique
Slag in stove carries out deoxidation modification；It is described to stay after slag technique refers to that tapping terminates, the clinker of a upper stove is stayed in slag hearth and converted
Enter the technique that half steel carries out next stove smelting.
The method of reduction semi-steel making flue dust described above, the deoxidation treatment that carried out to half steel requires half steel 1/3
When into half cylinder of steel, add deoxidier 1~3kg gauge according to steel per ton, it is disposable to add the deoxidation that whole Metal Weights need
Agent, it is 5~6min to control the tapping time.It is because if deoxidier shifts to an earlier date that present invention selection adds deoxidier in tapping 1/3
Add half cylinder of steel and be easily caused tapping process " blowing out ", cause security incident, if tapping 1/3 after add early stage flue dust compared with
Greatly, the purpose of smoke abatement is not reached.
The method of reduction semi-steel making flue dust described above, after the deoxidation modification requires that steelmaking converter tapping terminates, is stayed
Slag, deoxidier is added according to endpoint molten steel carbon content；When endpoint molten steel carbon content >=0.08%, steel per ton adds deoxidier
0.3~0.6kg；During endpoint molten steel carbon content ＜ 0.08%, steel per ton adds 0.7~1.5kg of deoxidier, while adding deoxidation
Waggle converter after agent, makes deoxidier be well mixed with slag, and slag is fully reduced.
The method of reduction semi-steel making flue dust described above, is blended into after slag modification and mixing, then into steelmaking converter
Half steel, it is necessary to control the iron making time be 2~5min, be that the half steel time is too short because if being blended into, iron making speed is fast so that unit
Oxidation of coal is fast in time, and moment produces a large amount of CO gases, so as to cause flue dust excessive, can be influenceed if being blended into half steel overlong time
Rhythm of production.
The method of reduction semi-steel making flue dust described above, wherein, the deoxidier is the deoxidier commonly used in steel-making, example
Such as ferrosilicon, silicomanganese deoxidation products do not have the deoxidier of gas, preferably ferrosilicon, and its silicone content >=70%, and granularity 20~
40mm.Deoxidier of the present invention is preferably ferrosilicon, and ferrosilicon is commonly used for deoxidier and alloying constituent in steel industry, is because silicon and oxygen
It is easy to be combined to silica, so ferrosilicon is usually used in making deoxidier during steel-making, simultaneously because SiO2Released during generation a large amount of
Heat, while deoxidation, to improve liquid steel temperature be also advantageous.Meanwhile, ferrosilicon is alternatively arranged as alloying element addition agent, extensively
General to be applied among low-alloy structural steel, spring steel, bearing steel, heat resisting steel and electrical steel, ferrosilicon is produced and changed in ferroalloy
Learn in industry, be also commonly used for reducing agent.
The present invention provides a kind of method for reducing semi-steel making flue dust, by being taken off in vanadium extraction tapping process to half steel
Oxygen and steelmaking converter tapping use to steelmaking converter after terminating and stay slag PROCESS FOR TREATMENT, and to stove before half steel is blended into staying slag technique
Interior slag carries out deoxidation modification, can significantly reduce flue dust (vanadium extraction tapping process and the steel-making produced during semi-steel making
Stove iron making process), the present invention stays slag technique due to being employed after tapping terminates to converter, can substantially reduce auxiliary material and steel
Material consumption, reduces technique, so as to save the energy, reduces production cost.
Brief description of the drawings
Fig. 1 reduces the process chart of semi-steel making flue dust for the present invention.
Embodiment
The method of present invention reduction semi-steel making flue dust, is mainly included in vanadium extraction stove tapping process and carries out deoxidation to half steel
Processing and steelmaking converter tapping use to steelmaking converter after terminating and stay slag PROCESS FOR TREATMENT, and right before half steel is blended into staying slag technique
Slag in stove carries out deoxidation modification；It is described to stay after slag technique refers to that tapping terminates, the clinker of a upper stove is stayed in slag hearth and converted
Enter the technique that half steel carries out next stove smelting.
The method of reduction semi-steel making flue dust described above, the deoxidation treatment that carried out to half steel requires half steel 1/3
When into half cylinder of steel, add deoxidier 1~3kg gauge according to steel per ton, it is disposable to add the deoxidation that whole Metal Weights need
Agent, it is 5~6min to control the tapping time.It is because if deoxidier shifts to an earlier date that present invention selection adds deoxidier in tapping 1/3
Add half cylinder of steel and be easily caused tapping process " blowing out ", cause security incident, if tapping 1/3 after add early stage flue dust compared with
Greatly, the purpose of smoke abatement is not reached.
The method of reduction semi-steel making flue dust described above, after the deoxidation modification requires that steelmaking converter tapping terminates, is stayed
Slag, deoxidier is added according to endpoint molten steel carbon content；When endpoint molten steel carbon content >=0.08%, steel per ton adds deoxidier
0.3~0.6kg；During endpoint molten steel carbon content ＜ 0.08%, steel per ton adds 0.7~1.5kg of deoxidier, while adding deoxidation
Waggle converter after agent, makes deoxidier be well mixed with slag, and slag is fully reduced.
The method of reduction semi-steel making flue dust described above, is blended into after slag modification and mixing, then into steelmaking converter
Half steel, it is necessary to control the iron making time be 2~5min, be that the half steel time is too short because if being blended into, iron making speed is fast so that unit
Oxidation of coal is fast in time, and moment produces a large amount of CO gases, so as to cause flue dust excessive, can be influenceed if being blended into half steel overlong time
Rhythm of production.
The method of reduction semi-steel making flue dust described above, wherein, the deoxidier is the deoxidier commonly used in steel-making, example
Such as ferrosilicon, silicomanganese deoxidation products do not have the deoxidier of gas, preferably ferrosilicon, and its silicone content >=70%, and granularity 20~
40mm.Deoxidier of the present invention is preferably ferrosilicon, and ferrosilicon is commonly used for deoxidier and alloying constituent in steel industry, is because silicon and oxygen
It is easy to be combined to silica, so ferrosilicon is usually used in making deoxidier during steel-making, simultaneously because SiO2Released during generation a large amount of
Heat, while deoxidation, to improve liquid steel temperature be also advantageous.Meanwhile, ferrosilicon is alternatively arranged as alloying element addition agent, extensively
General to be applied among low-alloy structural steel, spring steel, bearing steel, heat resisting steel and electrical steel, ferrosilicon is produced and changed in ferroalloy
Learn in industry, be also commonly used for reducing agent.
The embodiment of the present invention is further described with reference to embodiment, not therefore by present invention limit
System is among described scope of embodiments.
Embodiment 1
The 120t converters of certain factory use semi-steel making, vanadium extraction to add ferrosilicon 1kg/t into stove when going out half steel to 1/3 after terminating
Steel, controls the inclination angle of converter during tapping, the tapping time is 5min, and flue dust is significantly reduced when going out half steel.Vanadium extraction goes out after half steel terminates,
Half steel is hung into people's steelmaking converter to be made steel.Steelmaking converter is using slag technique is stayed, and this heat endpoint molten steel carbon content is 0.09%,
Tap is 130t, and tapping adds ferrosilicon ton steel 0.3kg after terminating, and grate is mixed back and forth.To endpoint molten steel deoxidation modification knot
Shu Hou, steelmaking converter is blended into by half steel, and controls iron making speed, and iron making time control is in 2min, by observation it can be found that converting
Iron process flue dust is significantly reduced.The process chart of present invention reduction semi-steel making flue dust is shown in accompanying drawing 1.
Embodiment 2
The 120t converters of certain factory use semi-steel making, vanadium extraction to add ferrosilicon into stove when going out half steel to 1/3 after terminating
1.5kg/t steel, controls the inclination angle of converter during tapping, the tapping time is 5.5min, and flue dust is significantly reduced when going out half steel.Vanadium extraction goes out half
After steel terminates, half steel is hung into people's steelmaking converter and made steel.Steelmaking converter uses and stays slag technique, this heat endpoint molten steel carbon content
For 0.05%, tap is 135t, and tapping adds ferrosilicon ton steel 1kg after terminating, and grate is mixed back and forth.To endpoint molten steel deoxidation
After modification terminates, half steel is blended into steelmaking converter, and controls iron making speed, iron making time control, can be with by observation in 3min
It was found that iron making process flue dust is significantly reduced.
Embodiment 3
The 120t converters of certain factory use semi-steel making, vanadium extraction to add ferrosilicon 3kg/t into stove when going out half steel to 1/3 after terminating
Steel, controls the inclination angle of converter during tapping, the tapping time is 6min, and flue dust is significantly reduced when going out half steel.Vanadium extraction goes out after half steel terminates,
Half steel is hung into people's steelmaking converter to be made steel.Steelmaking converter is using slag technique is stayed, and this heat endpoint molten steel carbon content is 0.03%,
Tap is 136t, and tapping adds ferrosilicon ton steel 1.5kg after terminating, and adds grate mixing back and forth after ferrosilicon.It is de- to endpoint molten steel
After oxygen modification terminates, half steel is blended into steelmaking converter, and controls iron making speed, iron making time control, can by observation in 4min
To find that iron making process flue dust is significantly reduced.
Embodiment 4
The 120t converters of certain factory use semi-steel making, vanadium extraction to add ferrosilicon into stove when going out half steel to 1/3 after terminating
2.5kg/t steel, controls the inclination angle of converter during tapping, the tapping time is 5min, and flue dust is significantly reduced when going out half steel.Vanadium extraction goes out half steel
After end, half steel is hung into people's steelmaking converter and made steel.Steelmaking converter is using slag technique is stayed, and this heat endpoint molten steel carbon content is
0.10%, tap is 140t, adds ferrosilicon ton steel 0.3kg according to endpoint molten steel carbon content and grate is mixed back and forth.To terminal
After deoxidation of molten steel modification terminates, half steel is blended into steelmaking converter, and controls iron making speed, iron making time control passes through in 5min
Observation is it can be found that iron making process flue dust is significantly reduced.
Claims (2)
1. reduce the method for semi-steel making flue dust, it is characterised in that：It is mainly included in vanadium extraction tapping process and half steel is taken off
Oxygen processing and steel-making tapping use to steelmaking converter after terminating and stay slag PROCESS FOR TREATMENT, and to stove before half steel is blended into staying slag technique
Interior slag carries out deoxidation modification；It is described to stay after slag technique refers to that tapping terminates, the clinker of a upper stove is stayed in slag hearth and is blended into
The technique that half steel carries out next stove smelting；It is described to half steel carry out deoxidation treatment requirement when going out half steel 1/3 into half cylinder of steel, press
Deoxidier 1~3kg gauge is added according to steel per ton, it is disposable to add the deoxidier that whole Metal Weights need, control the tapping time
For 5~6min；
After the deoxidation modification requires that tapping terminates, slag is stayed, deoxidier is added according to endpoint molten steel carbon content；Work as endpoint molten steel carbon
During content >=0.08%, steel per ton adds 0.3~0.6kg of deoxidier；During endpoint molten steel carbon content ＜ 0.08%, steel per ton is added
0.7~1.5kg of deoxidier；
It is described to be blended into the half steel time for 2~5min；
The deoxidier is at least one of ferrosilicon, silicomanganese.
2. the method for semi-steel making flue dust is reduced according to claim 1, it is characterised in that：The deoxidier be silicone content >=
70%, 20~40mm of granularity ferrosilicon.
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| CN108913838A (en) * | 2018-08-14 | 2018-11-30 | 攀钢集团西昌钢钒有限公司 | A method of reducing flue dust in half steel tapping process |
| CN109055653A (en) * | 2018-08-24 | 2018-12-21 | 攀钢集团西昌钢钒有限公司 | A kind of atomization dust-collecting equipment and method of half cylinder of steel |
| CN109797338A (en) * | 2019-02-11 | 2019-05-24 | 黑龙江建龙钢铁有限公司 | A kind of big packet of square billet process pours remaining back to half ladle semisteel smelting technique |
| CN114105506A (en) * | 2020-08-26 | 2022-03-01 | 宝山钢铁股份有限公司 | Steel slag modifier and steel slag thermal modification treatment process |
| 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 |
| CN112646943A (en) * | 2020-12-17 | 2021-04-13 | 攀钢集团西昌钢钒有限公司 | Method for controlling dry dedusting explosion venting in semisteel smelting |
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| CN103537150A (en) * | 2012-07-11 | 2014-01-29 | 攀钢集团研究院有限公司 | Environment-friendly dust removal method for molten iron tank |
| CN104099440B (en) * | 2014-07-31 | 2016-04-13 | 攀钢集团西昌钢钒有限公司 | Semi-steel making flue dust control method and Semi-steel making method |
| CN104611500A (en) * | 2015-02-27 | 2015-05-13 | 马钢(集团)控股有限公司 | Method for preventing splashing in iron blending by all slag retention in low-carbon steel smelting process |
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