CN106244759B - For the pretreated mechanical agitation desulfuration method of desulfurizing iron - Google Patents
For the pretreated mechanical agitation desulfuration method of desulfurizing iron Download PDFInfo
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- CN106244759B CN106244759B CN201610820556.4A CN201610820556A CN106244759B CN 106244759 B CN106244759 B CN 106244759B CN 201610820556 A CN201610820556 A CN 201610820556A CN 106244759 B CN106244759 B CN 106244759B
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- molten iron
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
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- Engineering & Computer Science (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses one kind being used for the pretreated mechanical agitation desulfuration method of desulfurizing iron, the sulfur method is completed by 5 big steps, its 5 big step is to take preceding sample thermometric, take off preceding slag, add desulfurizing agent stirring, take off rear slag, take rear sample thermometric respectively, wherein, in adding desulfurizing agent whipping step, agitating device is inserted into the hot-metal bottle equipped with molten iron, the agitating device is made of blender and deflector, the deflector and blender are inserted perpendicularly into molten iron, and deflector bottom is H away from vertical range at the top of mixing arm.The more conventional KR methods rotating speed of agitator speed of the present invention reduces by 10~20%；Insertion depth increases by 10~30% in the more conventional KR methods of blender insertion depth.
Description
Technical field
The present invention relates to external desulfurization of hot metal methods before pneumatic steelmaking, pretreated for desulfurizing iron in particular to one kind
Mechanical agitation desulfuration method.
Background technology
Molten iron mechanical agitation desulfuration is the rotational agitation by being inserted into the blender in hot-metal bottle inside molten iron, make molten iron with
Desulphurizer mixing contact carries out desulfurization, mainly there is Rhein method and KR (Kambara Reactor) method.Both molten iron mechanical agitations
Blender used in sulfur method is all made of rotary shaft and paddle, and four paddles are equal along rotary shaft circumferential direction across
Even arrangement, blender are inserted into molten iron along hot-metal bottle center line；Differ only in the depth difference that blender is inserted into molten iron.Rhein method
Only the paddle of blender is inserted partially into molten iron, is made on the molten iron and molten iron surface on hot-metal bottle top by stirring
Desulfurizing agent forms vortex, is mixed mutually, and so that the molten iron in entire hot-metal bottle is arrived at upper layer desulfurization zone by circulating
Realize desulfurization in domain；KR rules are that the paddle of blender is immersed in depth certain in molten iron, are stirred by the rotation of blender
It is dynamic, so that the desulfurizing agent on molten iron surface is involved in molten iron and carry out mixing desulfurization, expand vortex depth and desulphurization reaction region, increases
Strong circulating for molten iron has reached quickening rate of sulphur expulsion, has shortened desulfurization time, improves desulfuration efficiency, reducing desulfurizing agent and disappear
The resultant effect of consumption.Due to the excellent performance of KR methods, it is unique to become at present molten iron mechanical agitation desulfuration both at home and abroad
To the method for popularization and application.
However, being reported according to limited KR stirring desulphurizations flow regime research both at home and abroad, KR stirring desulphurization flow regimes point
For the free vortex flow area other than mixing center forced vortex area and the area, forced vortex area is due to the phase between not having liquid infinitesimal
It is poor mixing area to movement；And free vortex flow area causes the relative motion between liquid infinitesimal due to shuttling movement, plays
The effect of mixing dispersion.When stirring rotation, forced vortex area particle makees concentric circumferences movement, phase with fluid particle around axis
To speed very little, cannot carry out effectively mix dispersion, only between forced vortex area and blade tip region, solid-liquid turbulence compared with
It is violent, is the most strong region of mass transfer, transmission and dispersion mixing.Solid particle is involved in the depth in liquid substantially and liquid level
Concave depth is suitable, after particle is involved in liquid, between forced vortex area and blade tip region, is divided due to turbulence
It dissipates, and then floats under buoyancy, and more than " discharge " area along radial direction " discharge " under the action of the centrifugal force
Position be involved in-dispersion-shuttling movement being involved in.Thus, molten iron KR stirring desulphurizations transmission kinetic mechanism is that local volume is inhaled
Mixing, radial shear dispersion；And studies have shown that during KR stirring desulphurizations forced vortex area radius and agitator paddle radius it
Than being approximately 0.7, the effective mixing area of paddle is only 30%, and how to improve mixing dispersion situation of the desulfurizing agent in molten iron is
Improve the important channel of KR stirring desulphurization efficiency.
For this purpose, related scholar has carried out numerous studies from process, Operating parameters, agitator structure etc.
Work, to improve the dynamic conditions of mechanical agitation desulfuration, further increases the desulfurization performance of KR methods.
(1) process is improved.Chinese patent " KR method digesters subaeration " (number of patent application：200610124845.7)
A kind of KR methods digester subaeration is provided, is on the basis of KR methods, the air brick by being arranged in tank bottom is blown into tank
High pressure nitrogen promotes the floating of desulfurizing slag from molten iron, achievees the purpose that improve rate of sulphur expulsion and hot metal purifying degree, but shorten de-
Residence time of the sulphur agent in molten iron, meanwhile, per tank, time desulfurization consumes one block of air brick, increases desulfurizing iron cost.China
A kind of patent " composite desulfuration method for molten iron " (number of patent application：200510064272.8) provide a kind of composite desulfurization of molten iron side
Method is realized using rotary spray gun of the pipette tips with cross leaf blender by the injection of spray gun and the Stirring of blender
It is blown the compound desulfurization with stirring simultaneously.Though the compound desulfurization method of injection and stirring improves desulfurization kinetics condition, spray
The high pressure rotary sealing for blowing system is difficult, poor reliability, and equipment investment is big, it is difficult to which the needs for meeting safety and stability production fail
It promotes and applies.It is inclined that Chinese patent " mechanical agitation desulfuration method for hot metal " (publication number CN101492753A) discloses a kind of hot-metal bottle
Heart stirring desulphurization method deviates the stirring at hot-metal bottle center by blender, causes to stir swirl center deviation stirring axle center, hold back
The formation in mixing center forced vortex area when having made conventional KR stirring desulphurizations makes the desulfurizing agent that whirlpool sucks deviate stirring axle center non-
Symmetry is involved in cycle, and realizes that mixing of the desulfurizing agent being involved in molten iron disperses by the impact of mixing arm, to
Molten iron mechanical agitation desulfuration dynamic conditions is effectively improved, although achieving good type approval test in actual production
Effect, but larger eccentric thrust is stirred due to eccentric, the abrasion of hot-metal ladle and carriage brake system is promoted, hot-metal ladle and carriage is increased
Maintenance workers quality, bring difficulty to practical popularization and application.
(2) Operating parameters.More iron and steel enterprises successively take the mode for improving agitator speed to carry out more both at home and abroad
It mends and improves desulfurization kinetics condition, such as：The highest speed of agitator of 120 tons of hot-metal bottles of river prestige is up to 140 turns/min, Baoshan Iron and Steel Group
The highest speed of agitator of 150 tons of hot-metal bottles is close to 150 turns/min；According to document announcement, Japanese more iron and steel enterprises, which also take, to be carried
The means of high agitator speed improve desulfurization kinetics condition, and setting speed ranging from 100-150 turns/min.But since stirring is set
The limitation of standby performance, what speed of agitator improved is limited in scope, and the desulfurization kinetics improvement of terms effect reached is also extremely limited, together
When, the raising of speed of agitator makes blender abrasion aggravation, is increased on molten iron level, also result in blender reduced service life, iron
Water pot useful load declines.
(3) agitator structure optimizes.Document " improvement (translating selected passages) of Desulphurization of Pig Iron, Taiyuan Iron and Steel Co. translation, 1994, (1), 20-
25. " reports, SUMITOMO CHEMICAL metal deer island iron took the lead in having studied agitator paddle diameter and paddle the nineties in last century
Influence of the plate shape to desulfurization kinetics condition, it is proposed that the expanding dynamics with the outer convex mixing surface of blade of agitator paddle
Corrective measure, wherein special-shaped stirring blade is popularization and application due to shape remains difficult in actual use, and agitator paddle is expanding
It is applied with some iron and steel enterprises at home and abroad, but because molten iron level lifting height, stirring intensity are big with vibration, affects iron
Molten iron efficient loading amount, the blender service life of water pot, and crisis is kept the safety in production due to mixing plant vibration is big.Chinese patent
" a kind of stirrer for desulphurization of molten iron " (publication number CN101603111A) discloses a kind of paddle and meets
Lean forward the three leaf blenders on inclined-plane, is leaned forward structure by three blades, and enhancing stirring volume with volume inhales circular flow between being emptied, and reaches and changes
Kind desulfurization kinetics condition purpose, and the angle between blade is made to increase to 120 °, dry slag speed between blade is reduced, not only side
Dry slag cleaning, while reducing influence of the dry slag to blade stirring blade effective active area, improve stirring intensity
Stability.Chinese patent " molten iron desulphurization stirring device " (publication number CN201406443Y) discloses a kind of paddle and meets
Lean forward convex-shaped arc surface, back iron face is vertical plane or rake, the three leaves stirring that axially vertical section is the trapezoidal faces radially inside contracted
Device is designed by the polymorphic structure of paddle, further increases the angle between paddle, and the shearing point of blender is enhanced
Dissipate the improvement of ability and stirring desulphurization dynamic conditions.It can be seen that the improvement of above-mentioned agitator structure, mainly passes through
The mixing dispersion for strengthening stirring free vortex flow area, achievees the effect that improve molten iron mechanical agitation desulfuration dynamic conditions, but above-mentioned
Corrective measure cannot contain the formation in mixing center forced vortex area, can not reduce the volume size in forced vortex area, restrict
Molten iron mechanical agitation desulfuration dynamic conditions significantly improves effect.
Invention content
It being used for the pretreated mechanical agitation desulfuration method of desulfurizing iron it is an object of the present invention to provide a kind of, this method to be in iron
Desulfurizing agent discrete areas is wide, easy for operation in water, and with desulfurization kinetics condition is excellent, sorbent utilization is high, stirs
Mix the characteristics of low energy consumption.
In order to solve the above technical problems, provided by the invention a kind of for the pretreated mechanical agitation desulfuration side of desulfurizing iron
Method, the sulfur method are completed by 5 big steps, 5 big steps are sample thermometric before taking respectively, take off preceding slag plus desulfurizing agent stirring,
It takes off rear slag, take rear sample thermometric, wherein in adding desulfurizing agent whipping step, agitating device is inserted into the hot-metal bottle equipped with molten iron,
The agitating device is made of blender and deflector, and the deflector and blender are inserted perpendicularly into molten iron, and deflector
Bottom is H away from vertical range at the top of mixing arm.
Further, the deflector bottom is 50~150mm away from vertical range H at the top of mixing arm；
Still further, the deflector width W is 1/2~1 times of mixing arm length L；
Still further, the water conservancy diversion plate thickness D is 1/3~1 times of mixing arm thickness L；
Still further, the depth that the blender is inserted into molten iron is 3/5~4/5 times of molten iron level height h.
Still further, the distance between agitating shaft of the deflector and blender l is 50-500mm；
Still further, the deflector is the complex that metal core and refractory material form, shape is rectangle or ellipse
Shape.
Blender can be the blender of common blade structure type, can also be other blade construction forms or different leaves
Several blenders；Other operating methods are identical as KR methods.
The beneficial effects of the present invention are：
During conventional KR molten iron mechanical agitation desulfuration, whirlpool is formed by the rotation of blender, is added to molten iron level
The lighter desulfurizing agent of upper density enters molten iron under the Involving velocity of whirlpool, is divided by the rotating centrifugal force effect of blender
It dissipates, and floats under the action of buoyancy lift.It is carried out by the cycle of above three process, realizes desulfurizing agent in molten iron
Cycle volume is inhaled and mixes dispersion, and is reacted with the contact desulfuriation of molten iron by desulfurizing agent, completes the desulfurization of a tank time molten iron.It is related
Result of study shows that the eddy current depth for stirring formation has stronger relevance to molten bath particles diffusion characteristic；Only when stirring whirlpool
Whirlpool depth is more than mixing arm end, and sorbent particle can just realize diffusion in molten iron, i.e., must pass through desulfurizing agent
Vortices entrain could realize that the mixing of desulfurizing agent disperses between blade by the effect of blade.Therefore, in order to enable whirlpool is deep
Degree arrives between blade, must just higher rotating speed be relied on to increase whirlpool depth in actual production；Meanwhile blender insertion depth
Can not be too deep, otherwise it is unfavorable for whirlpool and comes downwards between mixing arm.It can be seen that higher blender in routine KR methods
The abrasion that rotating speed results in stirring high energy consumption, exacerbates blender；Meanwhile shallower blender insertion depth, but also desulfurization
Agent floating stroke is small compared with short, desulfurizing agent and molten iron Mixed Zone, bottom molten iron stirring and mixing effect is poor, affects desulfuration efficiency.
Compared to conventional KR methods desulfurization, the main of the method for the present invention has the beneficial effect that：
1) pass through the setting of deflector so that molten iron is forced, along deflector downlink, stirring in circumferentially stirring rotary course
When mixing vortex and being not up to mixing arm, promotes desulfurizing agent to be involved between mixing arm, be conducive to desulfurizing agent at lower turn
The lower mixing dispersion of speed.
2) downlink of baffled area stream stock so that axial flowing occurs in stirring rigid rotator region, promotes stirring
The turbulent flow in device rigid rotator region, reduces rigid rotator radius, improves the effective interaction length of mixing arm, into
" discharge " dispersion for strengthening sorbent particle is walked, is also effectively reduced between mixing arm caused by rigid rotator
Seriously caused whipping performance declines the problems such as short with stirrer life to dry slag.
3) due to that stirring vortex need not be required to reach blade tip as conventional KR methods, the present invention can make blender insert
Enter that depth is deeper, increase the floating shape journey of desulfurizing agent, effectively expands melting bath stirring mixing discrete areas, it is also possible to
Under lower rotating speed, realizes preferable desulphurizer mixing dispersion, save stirring energy consumption, reduce the abrasion of blender, increase is stirred
Mix the service life of device.
4) the more conventional KR methods rotating speed of agitator speed reduces by 10~20%；It is inserted into the more conventional KR methods of blender insertion depth
Depth increases by 10~30%.
Description of the drawings
Fig. 1 is the front view of agitating device in the present invention；
Fig. 2 is the vertical view of agitating device in the present invention；
In figure：Blender 1, deflector 2, hot-metal bottle 3.
Specific implementation mode
In order to preferably explain the present invention, below in conjunction with the specific embodiment main contents that the present invention is furture elucidated, but
Present disclosure is not limited solely to following embodiment.
Embodiment 1
A kind of as shown in Fig. 1~2 to be used for the pretreated mechanical agitation desulfuration method of desulfurizing iron, which is by several
What big step was completed, several big steps are to take preceding sample thermometric, take off preceding slag, add desulfurizing agent stirring, take off rear slag, rear sample is taken to survey respectively
Temperature, wherein in adding desulfurizing agent whipping step, by agitating device be inserted into equipped with molten iron hot-metal bottle 3 in, the agitating device by
Blender 1 and deflector 2 form, and the deflector 2 and blender 1 are inserted perpendicularly into molten iron, and 2 bottom of deflector is away from stirring
It is 50mm that 1 vane tip vertical range of device, which is H,；Deflector 2 is 100mm away from agitating shaft vertical range A close to agitating shaft side；
2 width W of deflector is 1/2 times of mixing arm length L；
2 thickness D of deflector is 1/2 times of mixing arm thickness L；
The depth that blender 1 is inserted into molten iron is 3/5 times of molten iron level height h.
Blender 1 is conventional four leaf blenders；Deflector 2 is the complex that metal core and refractory material form, and shape is
Rectangle.
Other operating methods are identical as KR methods.The more conventional KR methods rotating speed of agitator speed reduces by 20%.
Embodiment 2
The method of the present embodiment is substantially the same manner as Example 1, the difference is that：
Deflector bottom is 100mm away from vertical range H at the top of mixing arm；Lead blender 1 be inserted into molten iron depth be
4/5 times of molten iron level height h.Flowing plate is 50mm away from agitating shaft vertical range A close to agitating shaft side；Deflector width W is
1 times of mixing arm length L；The more conventional KR methods rotating speed of agitator speed reduces by 10%.
Embodiment 3
The method of the present embodiment is substantially the same manner as Example 1, the difference is that：
Deflector bottom is 75mm away from vertical range H at the top of mixing arm；It is iron to lead blender 1 and be inserted into the depth of molten iron
3.5/5 times of water level height h..Deflector is 200mm away from agitating shaft vertical range A close to agitating shaft side；Deflector width
W is 3/4 times of mixing arm length L；The more conventional KR methods rotating speed of agitator speed reduces by 15%.
Embodiment 4
The present embodiment and embodiment 1 difference lies in：Blender is three leaf blenders.
Embodiment 5
The present embodiment and embodiment 1 difference lies in：Water conservancy diversion plate shape is ellipse.
Other unspecified parts are the prior art.Although above-described embodiment is made that the present invention and retouches in detail
State, but it is only a part of the embodiment of the present invention, rather than whole embodiments, people can also according to the present embodiment without
Other embodiment is obtained under the premise of creativeness, these embodiments belong to the scope of the present invention.
Claims (2)
1. one kind being used for the pretreated mechanical agitation desulfuration method of desulfurizing iron, which completed by 5 big steps,
5 big steps are to take preceding sample thermometric, take off preceding slag, add desulfurizing agent stirring, take off rear slag, take rear sample thermometric respectively, wherein are adding desulfurizing agent
In whipping step, agitating device is inserted into the hot-metal bottle equipped with molten iron, it is characterised in that：The agitating device by blender and
Deflector forms, and the deflector and blender are inserted perpendicularly into molten iron, and deflector bottom is away from vertical at the top of mixing arm
Straight distance is H；
Wherein, the deflector bottom is 50~150mm away from vertical range H at the top of mixing arm；The deflector is close to be stirred
It is 50~500mm that axis side, which is mixed, away from agitating shaft vertical range A；The deflector width W is the 1/2~1 of mixing arm length L
Times；The water conservancy diversion plate thickness D is 1/3~1 times of mixing arm thickness L；The depth that the blender is inserted into molten iron is molten iron
3/5~4/5 times of tank height h.
2. being used for the pretreated mechanical agitation desulfuration method of desulfurizing iron according to claim 1, it is characterised in that：It is described to lead
Flowing plate is the complex that metal core and refractory material form, and shape is rectangle or ellipse.
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| CN106244759B true CN106244759B (en) | 2018-10-16 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108384914B (en) * | 2018-03-27 | 2020-04-03 | 北京首钢股份有限公司 | Stirring device and stirring method for KR desulfurization method |
| CN108588318B (en) * | 2018-05-22 | 2019-11-08 | 武汉钢铁有限公司 | Molten iron mechanical stirring efficient low-consume sulfur method |
| CN109666772A (en) * | 2019-02-28 | 2019-04-23 | 武汉钢铁有限公司 | Molten iron KR stirring desulphurization method based on image recognition |
| CN111154944A (en) * | 2019-10-29 | 2020-05-15 | 攀钢集团西昌钢钒有限公司 | Device and method for recovering vanadium slag through desulfurization |
| CN113215344B (en) * | 2021-04-16 | 2022-11-18 | 首钢集团有限公司 | KR stirring molten iron desulphurization method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103642986A (en) * | 2013-12-24 | 2014-03-19 | 辽宁中邦高新技术发展有限公司 | Composite desulfurization blender of double-blade molten iron |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2945385B1 (en) * | 1998-06-16 | 1999-09-06 | 川崎重工業株式会社 | Hot metal desulfurization method and desulfurization device |
| CN102978323A (en) * | 2012-12-18 | 2013-03-20 | 营口东邦冶金设备耐材有限公司 | Multi-blade molten iron desulphurization stirring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103642986A (en) * | 2013-12-24 | 2014-03-19 | 辽宁中邦高新技术发展有限公司 | Composite desulfurization blender of double-blade molten iron |
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Effective date of registration: 20170703 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Applicant after: Wuhan iron and Steel Company Limited Address before: 430083 Qingshan District, Hubei, Wuhan Applicant before: WUHAN IRON AND STEEL CORPORATION |
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