CN107779548A - A kind of device and method of the side-blown injection refining of safe and efficient ladle - Google Patents
A kind of device and method of the side-blown injection refining of safe and efficient ladle Download PDFInfo
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- CN107779548A CN107779548A CN201710914494.8A CN201710914494A CN107779548A CN 107779548 A CN107779548 A CN 107779548A CN 201710914494 A CN201710914494 A CN 201710914494A CN 107779548 A CN107779548 A CN 107779548A
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- ladle
- powder
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- pulvis
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
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Abstract
The present invention relates to a kind of device of the safe and efficient side-blown injection refining of ladle, described device is located in ladle, and being built inside the ladle has ladle brick, and described device includes N number of element that dusts, N >=1；N number of element that dusts partly or entirely is embedded in N number of ladle brick；One end of N number of element that dusts communicates with inside the ladle, for ladle side blowing powder, for the other end of N number of element that dusts by being connected for powder passage with outside powder feeder unit, the outside powder feeder unit arrival end is higher than the height of molten steel in the ladle.Meanwhile the invention further relates to a kind of method of the safe and efficient side-blown injection refining of ladle.The present invention is dusted, and unit is simple to operate, and efficiency high, metallurgical effect is good, can directly obtain higher economic benefit；With it is traditional the method for pulvis is added by top compared with, the method for side-blown spray of the invention has that impeller in slurry pump speed is fast, the reaction time is short, desulfurization and removes the advantages of steel inclusion effect is good.
Description
Technical field
The present invention relates to steelmaking technical field, more particularly to a kind of device of the side-blown injection refining of safe and efficient ladle
And method.
Background technology
Manganese ore direct alloying technique technology, which has, reduces Mn series alloy consumption, reduces steel-making cost, reduces environmental pollution etc. excellent
Point, is mainly used in convertor steelmaking process.Nippon Steel enterprise is turned on the basis of based on molten iron pretreatment and less-slag melting
Manganese ore direct alloying technique manganese yield in stove is stable 70% or so, can after preferable economic benefit.But domestic steel
The practical effect of enterprise is bad, and for manganese yield 10%~60%, its main cause is that domestic iron and steel enterprises do not have mostly
There are a liquid iron pre-treatments, phosphorus content is higher in molten iron, and the quantity of slag is big when converter carries out manganese ore direct alloying technique, slag oxidation
The problems such as property is strong, the problem of manganese yield is low, and unstable.Therefore, a kind of new approach of demand carries out manganese ore alloying, right
It is particularly important in the application of manganese ore alloying technology.
In terms of current manganese ore direct alloying technique technique, the mode of addition be smelt and tapping process in by push up slag to
Added in molten steel, the reaction being related to is reacted between " slag-steel ", and this feed postition shortcoming is manganese ore melting time length, in ladle
Mixing effect is poor, dynamics deficiency, and reaction interface area is small, it is necessary to find out the feed postition for expanding reaction interface and technique side
Method.
Application No. CN201110235141.8, a kind of entitled metal slit-type ladle bottom blowing powder injection apparatus, and
Application No. CN201110234911.7, a kind of entitled ladle bottom blowing power injection device with whirlwind-type flow-smoothing gas storage chamber use
The method of ladle bottom blowing is dusted, and can solve the problems, such as ladle mixing effect difference well, but in liquid steel refining process
In, the function of bottom blowing stirring of inert gas is taken into account in the bottom blowing hole of ladle, if bottom blowing hole plug and bleed-out, can be brought to production compared with
Big difficulty and loss；Meanwhile the maintenance of bottom blowing powder injection element is relatively difficult.
The content of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of device of side-blown injection refining of safe and efficient ladle and
Method, to solve the problems, such as that existing bottom blowing hole plug and bleed-out and bottom blowing powder injection component maintenance are relatively difficult.
The purpose of the present invention is mainly achieved through the following technical solutions：
A kind of device of the side-blown injection refining of safe and efficient ladle, described device is located in ladle, in the ladle
Portion, which is built, ladle brick, and described device includes N number of element that dusts, N >=1；The N elements that dust partly or entirely are embedded in N number of institute
State in ladle brick；One end of N number of element that dusts communicates with inside the ladle, is ladle side blowing powder,
The other end of N number of element that dusts for powder passage with outside powder feeder unit by being connected, the outside powder feeder unit entrance
End is higher than the height of molten steel in the ladle.
The present invention has the beneficial effect that：Apparatus of the present invention are safe, maintenance is easy, and simple in construction, easily make,
It is high with bottom blowing stirring of inert gas gas interactions, reaction efficiency.
Further, the element that dusts is arranged in the percentage that the ladle total height is accounted for the distance of the ladle bottom
Than for 20%~50%.
It is using the above-mentioned further beneficial effect of scheme：Original of the invention by this height of the position restriction for the element that dusts
Because being：When the position for the element that dusts is less than 20%, the pulvis of injection easily impacts to furnace bottom, influences the life-span of ladle；
When the position for the element that dusts is higher than 50%, the pulvis sprayed can not be covered all in the region of ladle bottom, be influenceed whole
The reaction effect of ladle molten steel and spray.
Further, the angle of dusting of the element that dusts is -40 °~40 °, the blowing direction of 0 ° of element that refers to dust with
Liquid level in the ladle is concordant.
It is using the above-mentioned further beneficial effect of scheme：The present invention angle that will dust is arranged between ± 40 °, mainly
Purpose is to ensure the molten steel of whole ladle and fully contacting for sprayed pulvis；Within 40 °, ensure that sprayed pulvis exists
In liquid level, without going out liquid level；Within -40 °, ensure that spray will not be flushed to ladle bottom, shadow is caused to the refractory material of bottom
Ring.
Further, the element that dusts is mono-layer tube or bilayer sleeve, one end of the mono-layer tube or bimetallic tube and institute
The side flush of ladle brick is stated, the other end of the mono-layer tube or bimetallic tube passes through for powder passage and confession outside the ladle
Powder device is connected.
The present invention uses mono-layer tube, is because mono-layer tube is simple in construction, reduces cost；The present invention uses bimetallic tube, can
Ensure the normal ejection of pulvis, if a pipeline obstruction, do not interfere with total injection effect.
Further, the element that dusts includes air chamber, powder inlet and for tube cell, the air chamber, powder inlet and supplies tube cell
Be embedded in the ladle brick, one end of the powder inlet is connected with one end of the air chamber, the other end of the air chamber with
Described to be connected for tube cell, the number for tube cell is more than 1；The other end of the powder inlet by for powder passage with it is described
Powder feeder unit is connected outside ladle.
The present invention unit that dusts is embedded in ladle brick by air chamber, powder inlet and for tube cell, advantage of this is that
In cylinder-packing, the brick of one piece of entirety is formed, can be carried out in advance, during use as other bricks, be normally carried out building by laying bricks or stones, operated
Simply.
Further, the element that dusts includes air chamber, powder inlet and for tube cell, described to be embedded in the bag for tube cell
In lining brick, the air chamber is not embedded in the ladle brick with the powder inlet, one end of the powder inlet and the air chamber
One end is connected, and the other end of the air chamber is connected with described for tube cell, and the number for tube cell is more than 1；The powder inlet
The other end by being connected for powder passage and the ladle outside powder feeder unit.
Powder inlet and air chamber are not embedded in ladle brick by the present invention unit that dusts, if advantage of this is that pipeline
Block, the position of blocking can be checked at any time；Ability with repairing.
A kind of method of the side-blown injection refining of safe and efficient ladle, when the ladle for being provided with the unit that dusts enters Argon
Stand, after LF or RH processes, pulvis into the ladle is sprayed into from side by the unit that dusts with outside dusting device.
Benefit using spray refining method of the present invention is that processing is convenient, and the refining effect of acquisition is good, when saving refining
Between；Meanwhile the contact area of molten steel and pulvis can be promoted using spray refining method of the present invention, reaction speed is fast, during reaction
Between tail off, so as to shorten the time of refining treatment, while ensure that refining desulfuration, melting and reducing and other effects.
Further, when the unit that dusts sprays into pulvis from side to the ladle, argon bottom-blowing is strong in the ladle
Degree control is in 0.003Nm3/ t.min~0.008Nm3Between/t.min.
The intensity of present invention control argon bottom-blowing, can ensure the mixing effect of molten steel, but will not cause molten steel big simultaneously
Area is exposed, avoids causing the nitrogen pick-up of molten steel.
Further, the pressure limit control of the unit blowing powder that dusts is described to dust in 0.1Mpa~0.5Mpa
The time control of unit blowing powder is controlled in 10kg/min~150kg/min in 3min~10min, the range of flow that dusts.
The pressure of present invention control blowing powder can ensure that pulvis smoothly enters in molten steel, and control is dusted the time, can
Ensure the requirement of refining time, rhythm.
Further, the pulvis is the lime for molten steel desulfurizing processing, and addition is 1~10kg/t steel；Or institute
The magnesium metal that pulvis is the Oxide Metallurgy for molten steel is stated, addition is 1~5kg/t steel；Or the pulvis is for steel
Water removes the deoxidation purificant of steel inclusion, and addition is 1~8kg/t steel；Or the pulvis is for realizing molten steel
The addition of the manganese mineral powder or chromite ore fine of manganese ore or chrome ore DIRECT ALLOYING, the manganese mineral powder or chromite ore fine is 5~50kg/t
Steel.
Beneficial effects of the present invention are：
(1) present invention is dusted, and unit is simple to operate, and efficiency high, metallurgical effect is good, can directly obtain higher economic effect
Benefit；
(2) with it is traditional the method for pulvis is added by top compared with, the method for side-blown spray of the invention has slag golden
Reaction speed is fast, the reaction time is short, desulfurization and remove steel inclusion effect it is good the advantages of；
(3) compared with ladle bottom blowing mode, equipment safety of the invention is high, it is easy to safeguard, is stirred with bottom blowing inert gas
Gas interactions are mixed, reaction efficiency is higher.
In the present invention, it can also be mutually combined between above-mentioned each technical scheme, to realize more preferred compositions schemes.
Other features and advantages of the present invention will illustrate in the following description, also, certain advantages can become aobvious from specification
And be clear to, or understood by implementing the present invention.The purpose of the present invention and other advantages can by the specification write,
Specifically noted structure is realized and obtained in claims and accompanying drawing.
Brief description of the drawings
Accompanying drawing is only used for showing the purpose of specific embodiment, and is not considered as limitation of the present invention, in whole accompanying drawing
In, identical reference symbol represents identical part.
Fig. 1 is the device of the side-blown injection refining of safe and efficient ladle of the embodiment of the present invention 1；
Fig. 2 is the device arrangement of the side-blown injection refining of safe and efficient ladle of the embodiment of the present invention 1；
Fig. 3 is the powder feeder unit that the air brick of the embodiment of the present invention 1 is embedded in multiple steel pipes with air chamber；
Fig. 4 is the device of the side-blown injection refining of safe and efficient ladle of the embodiment of the present invention 2；
Fig. 5 is the device arrangement of the side-blown injection refining of safe and efficient ladle of the embodiment of the present invention 2；
Fig. 6 is the powder feeder unit that the air brick of the embodiment of the present invention 2 is embedded in single steel pipe；
Fig. 7 is the device of the side-blown injection refining of safe and efficient ladle of the embodiment of the present invention 3；
Fig. 8 is the device arrangement of the side-blown injection refining of safe and efficient ladle of the embodiment of the present invention 3；
Fig. 9 is the powder feeder unit that the air brick of the embodiment of the present invention 3 is embedded in bilayer sleeve；
Figure 10 is the powder feeder unit that the air chamber of the embodiment of the present invention 4 is embedded in multiple steel pipes in outside, air brick；
Figure 11 is that Si, C reduce MnO free energy and the relation thermomechanical curve figure of temperature.
In figure, 1- involucrums, 2- ladle bricks, 3- supplies powder passage, 4- powder inlets, 5- air chambers, and 6- supplies tube cell, 7- single tubes, outside 8-
Pipe, 9- inner tubes, 10- inner tube refractory material fillers.
Embodiment
The preferred embodiments of the present invention are specifically described below in conjunction with the accompanying drawings, wherein, accompanying drawing forms the application part,
And it is used for the principle for explaining the present invention together with embodiments of the present invention, it is not intended to limit the scope of the present invention.
The present invention specific embodiment by being tested in the device of the side-blown injection refining of safe and efficient ladle,
Reacted simultaneously in 150t ladles.
Embodiment 1
The present embodiment is directed to 150t ladles, is sprayed using the device of the side-blown injection refining of safe and efficient ladle into ladle
Powder, as shown in figure 1, being built inside the involucrum 1 of ladle has ladle brick 2, by apart from 1 piece of embedded band that ladle bottom L is 800mm
The ladle brick for having the steel pipe of air chamber is connected as powder feeder unit, one end of powder feeder unit with outside involucrum 1 by confession powder passage 3,
Pulvis outside involucrum 1 to being blown into inside ladle brick 2, to supply powder inside ladle；It is noted that pass through bag for powder passage 3
Space between shell 1 and ladle brick 2 passes involucrum 1, and the position for passing involucrum 1 for powder passage 3 is located at the top of involucrum 1, and
Its position is higher than the upper surface of molten steel, to prevent the leakage of molten steel；
As shown in Fig. 2 the distance L of powder feeder unit and ladle bottom is 800mm, the direction of dusting of powder feeder unit is level,
And the device and ladle trunnion angle α are 60 °.
As shown in figure 3, the present embodiment powder feeder unit is made up of 1 piece of ladle brick, powder inlet, air chamber and 3 for tube cell, enter
Powder mouth, air chamber and 3 are entirely embedded within ladle brick for tube cell, meanwhile, one end of powder inlet is connected with one end of air chamber, separately
One end is connected with for powder passage 3, and the other end of air chamber with 3 for tube cell with being connected respectively, 3 other ends and bag for tube cell
The flush of lining brick；It is noted that 3 calibers for tube cell are 10mm.
The present embodiment adds silicomanganese 3040kg, ferrosilicon 500kg, carburant 20kg in converter tapping, after tapping, is blowing
Argon station or LF processes, the manganese mineral powder of proper ratio, carbon dust, pulverized limestone, the powder of ferrosilicon composition are sprayed into ladle with powder spraying pot
Agent, the composition of pulvis are：Manganese ore 58.34%, pulverized limestone 11.67%, carbon dust 23.34%, compound made of ferrosilicon 6.65%
As pulvis, the manganese mineral powder respectively formed before combination, pulverized limestone, carbon dust are stocked up by drying, broken, levigate be used as；Wherein powder
The addition quality of agent is manganese ore 500kg, SiFe powder 57kg, carbon dust 200kg, pulverized limestone 100kg；
Table 1 is different sample point ladle chemistries, and the purpose for measuring different sample point molten steel compositions is according to molten steel
Initial content, it is determined that adding the suitable quantity of spray；The benefit dusted using apparatus of the present invention be shorten refining time,
Improve refining efficiency.
The different sample point ladle chemistries of table 1
| Sampling spot | C/% | Si/% | Mn/% | P/% | S/% | T/℃ |
| Converter terminal | 0.1 | 0.001 | 0.08 | 0.02 | 0.015 | 1690 |
| After tapping | 0.13 | 0.55 | 1.27 | 0.021 | 0.014 | 1640 |
| After feeding powder | 0.21 | 0.57 | 1.40 | 0.022 | 0.015 | 1620 |
The material chemical component of addition is by percentage to the quality：Silicomanganese chemical composition is by percentage to the quality：Si
18.69%, Mn 66.69%, P 0.137%, C 1.43%, S 0.0244%；Ferrosilicon chemical composition：Si 74.51%, Mn
0.12%, P 0.026%, C 0.17%, S 0.007%；Carbon dust chemical composition：Fixed carbon 93.67%, P 0.015%, S
0.21%；Lime：CaO 82.78%, SiO2:3.11%, MgO 7.99%, Al2O31.19%, S 0.030%, P
0.006%；Manganese ore chemical composition：TMn 42.8%, SiO216%, TFe 11.6%, P 0.13%, S 0.016%.Because of silicon
There are some other impurity in manganese, ferrosilicon, carbon dust and lime, general composition total amount can not reach 100%.
The tapping temperature of the present embodiment is controlled at 1670-1700 DEG C, and jetting pressure 0.18-0.22Mpa, dust flow
For 100kg/min, the injection time is 5min.
This example using apparatus of the present invention dust, and can to obtain increase manganese content be 0.13%, and manganese yield is
91.1%.
Embodiment 2
The present embodiment is directed to 150t ladles, is sprayed using the device of the side-blown injection refining of safe and efficient ladle into ladle
Powder, as shown in figure 4, being built inside the involucrum 1 of ladle has ladle brick 2, by apart from 2 pieces of embedded bands that ladle bottom L is 800mm
There is the ladle brick of the steel pipe of air chamber as powder feeder unit, respectively supplied inside ladle；The structure of 2 powder feeder units is identical, i.e.,
One end of powder feeder unit with, by being connected for powder passage 3, pulvis is outside involucrum 1 to blowing inside ladle brick 2 outside involucrum 1
Enter, to supply powder inside ladle；It is noted that involucrum 1 is passed by the space between involucrum 1 and ladle brick 2 for powder passage 3,
And the position for supplying powder passage 3 to pass involucrum 1 is located at the top of involucrum 1, and its position is higher than the upper surface of molten steel, to prevent steel
The leakage of liquid；
As shown in figure 5, the distance L of powder feeder unit and ladle bottom is 800mm, dust direction and the water of 2 powder feeder units
Square to β into 15 ° of angles, and 2 powder feeder units and ladle trunnion angle α are respectively 45 ° and 135 °.It is noted that this
The blowing direction of 2 powder feeder units in embodiment can be different, can be 15 ° with one, another is -15 °.
As shown in fig. 6, each powder feeder unit of the present embodiment is made up of 1 piece of ladle brick and 1 single tube, single tube is embedded into bag
In lining brick, and one end of single tube is connected with for powder passage 3, the other end of single tube and the flush of ladle brick, is to be supplied in ladle
Powder；It is noted that the caliber of single tube is 12mm.
The present embodiment adds silicomanganese 2980kg, ferrosilicon 600kg, carburant 30kg in converter tapping.After tapping, blowing
Argon station or LF processes, manganese mineral powder, light dolomite powder, pulverized limestone and the ferrosilicon of proper ratio are sprayed into ladle with powder spraying pot
The pulvis of composition, the composition of pulvis are：Manganese ore 55.56%, light dolomite powder 14.77%, carbon dust 27.78%, ferrosilicon
Compound made of 7.41% is as pulvis, wherein manganese ore 600kg, SiFe powder 80kg is added, carbon dust 300kg, light dolomite
Powder 100kg, the manganese ore respectively formed before combination, light dolomite powder, carbon dust are stocked up by drying, broken, levigate be used as.
Table 2 is different sample point ladle chemistries.
The different sample point ladle chemistries of table 2
| Sampling spot | C/% | Si/% | Mn/% | P/% | S/% | T/℃ |
| Converter terminal | 0.12 | 0.003 | 0.07 | 0.018 | 0.010 | 1700 |
| After tapping | 0.15 | 0.59 | 1.23 | 0.019 | 0.011 | 1650 |
| After feeding powder | 0.26 | 0.61 | 1.39 | 0.022 | 0.010 | 1620 |
Tapping process adds silicomanganese.
The material chemical component of addition is by percentage to the quality：Silicomanganese chemical composition：Si 18.69%, Mn
66.69%, P 0.137%, C 1.43%, S 0.0244%；Ferrosilicon chemical composition：Si 74.51%, Mn 0.12%, P
0.026%, C 0.17%, S 0.007%；Carbon dust chemical composition：Fixed carbon 93.67%, P 0.015%, S 0.21%；Gently
Calcined dolomite：CaO 45.0%, SiO2:2.15%, MgO 38%, burning subtract 14.2%, S 0.030%, P 0.03%；Manganese ore
Chemical composition：TMn 42.8%, SiO216%, TFe 11.6%, P 0.13%, S 0.016%.
The tapping temperature of the present embodiment is controlled at 1670-1700 DEG C, and jetting pressure 0.18-0.22Mpa, dust flow
For 100kg/min, the injection time is 6min.
This example using apparatus of the present invention dust, and can to obtain increase manganese content be 0.16%, and manganese yield is
93.5%.
Embodiment 3
The present embodiment is directed to 150t ladles, is sprayed using the device of the side-blown injection refining of safe and efficient ladle into ladle
Powder, as shown in fig. 7, being built inside the involucrum 1 of ladle has ladle brick 2, by apart from 3 pieces of embedded bands that ladle bottom L is 800mm
There is the ladle brick of the steel pipe of air chamber as powder feeder unit, respectively supplied inside ladle；The structure of 3 powder feeder units is identical, i.e.,
One end of powder feeder unit with, by being connected for powder passage 3, pulvis is outside involucrum 1 to blowing inside ladle brick 2 outside involucrum 1
Enter, to supply powder inside ladle；It is noted that involucrum 1 is passed by the space between involucrum 1 and ladle brick 2 for powder passage 3,
And the position for supplying powder passage 3 to pass involucrum 1 is located at the top of involucrum 1, and its position is higher than the upper surface of molten steel, to prevent steel
The leakage of liquid；
As shown in figure 8, the distance L of powder feeder unit and ladle bottom is 800mm, dust direction and the water of 3 powder feeder units
Square to β into -15 ° of angles, and 3 powder feeder units and ladle trunnion angle α are respectively 45 °, -45 ° and 135 °.
As shown in figure 9, each powder feeder unit of the present embodiment is made up of 1 piece of ladle brick and 1 bilayer sleeve, bilayer sleeve
It is embedded into ladle brick, and one end of bilayer sleeve is connected with for powder passage 3, the other end of bilayer sleeve and the table of ladle brick
Face is concordant, to supply powder in ladle；It is noted that bilayer sleeve includes inner and outer tubes, inner tube is located at the inside of outer tube, interior
It is filled with refractory material filler in pipe, outward appearance a diameter of 22mm, diameter of inner pipe 10mm, the present embodiment selection double braid covering
Pipe.It is noted that the present embodiment is if a line clogging using the benefit of bilateral sleeve pipe, total spray is not interfered with
Blow effect.
The present embodiment adds silicomanganese 3080kg, ferrosilicon 600kg, carburant 20kg in converter tapping, after tapping, is blowing
Argon station or LF processes, the powder that manganese mineral powder, carbon dust, pulverized limestone and the ferrosilicon of proper ratio form is sprayed into ladle with powder spraying pot
Agent, the composition of pulvis are：Manganese ore 52.25%, pulverized limestone 10.45%, carbon dust 31.35%, compound made of ferrosilicon 5.96%
As pulvis, wherein adding manganese ore 500kg, SiFe powder 57kg, carbon dust 300kg, lime 100kg, the manganese respectively formed before combination
Ore deposit, pulverized limestone, carbon dust are stocked up by drying, broken, levigate be used as.Particle diameter after levigate be less than 0.15mm (100 mesh with
It is interior), so ensure that pulvis is well mixed.It is noted that during using ferrosilicon powder, without levigate.
Table 3 is different sample point ladle chemistries.
The different sample point ladle chemistries of table 3
| Sampling spot | C/% | Si/% | Mn/% | P/% | S/% | T/℃ |
| Converter terminal | 0.08 | 0.002 | 0.10 | 0.015 | 0.010 | 1690 |
| After tapping | 0.11 | 0.60 | 1.30 | 0.015 | 0.010 | 1630 |
| After feeding powder | 0.22 | 0.62 | 1.43 | 0.018 | 0.011 | 1600 |
The material chemical component of addition is：Silicomanganese chemical composition：Si 18.69%, Mn 66.69%, P 0.137%, C
1.43%, S 0.0244%；Ferrosilicon chemical composition：Si 74.51%, Mn 0.12%, P 0.026%, C 0.17%, S
0.007%；Carbon dust chemical composition：Fixed carbon 93.67%, P 0.015%, S 0.21%；Lime：CaO 82.78%, SiO2:
3.11%, MgO 7.99%, Al2O31.19%, S 0.030%, P 0.006%；Manganese ore chemical composition：TMn 42.8%,
SiO216%, TFe 11.6%, P 0.13%, S 0.016%.
The tapping temperature of the present embodiment is controlled at 1670-1700 DEG C, and jetting pressure 0.18-0.22Mpa, dust flow
For 100kg/min, the injection time is 5min.
This example using apparatus of the present invention dust, and can to obtain increase manganese content be 0.13%, and manganese yield is
91.1%.
Embodiment 4
The present embodiment is directed to 150t ladles, is sprayed using the device of the side-blown injection refining of safe and efficient ladle into ladle
Powder, as shown in figure 1, being built inside the involucrum 1 of ladle has ladle brick 2, by apart from 1 piece of embedded band that ladle bottom L is 800mm
The ladle brick for having the steel pipe of air chamber is connected as powder feeder unit, one end of powder feeder unit with outside involucrum 1 by confession powder passage 3,
Pulvis outside involucrum 1 to being blown into inside ladle brick 2, to supply powder inside ladle；It is noted that pass through bag for powder passage 3
Space between shell 1 and ladle brick 2 passes involucrum 1, and the position for passing involucrum 1 for powder passage 3 is located at the top of involucrum 1, and
Its position is higher than the upper surface of molten steel, to prevent the leakage of molten steel；
As shown in Fig. 2 the distance L of powder feeder unit and ladle bottom is 800mm, the direction of dusting of powder feeder unit is level,
And the device and ladle trunnion angle α are 60 °.
As shown in Figure 10, the present embodiment powder feeder unit is made up of 1 piece of ladle brick, powder inlet, air chamber and 3 for tube cell, and 3
It is individual to be embedded in for tube cell in ladle brick, and powder inlet is not embedded into ladle brick with air chamber, meanwhile, one end of powder inlet and gas
One end of room is connected, and the other end is connected with for powder passage 3, and the other end of air chamber is connected with 3 for tube cell respectively, and 3 supply tube cell
The other end and ladle brick flush；It is noted that 3 calibers for tube cell are 10mm.
Silicomanganese 3000kg, ferrosilicon 580kg, carburant 20kg are added during the present embodiment converter tapping, after tapping, in Argon
Stand or LF processes, the pulvis that the manganese mineral powder of proper ratio, light dolomite powder, carbon dust, ferrosilicon form, powder are sprayed into powder spraying pot
The composition of agent is：Manganese ore 52.17%, light dolomite powder 8.70%, carbon dust 30.43%, compound made of ferrosilicon 8.70%
As pulvis, wherein adding manganese ore 600kg, SiFe powder 100kg, carbon dust 350kg, light dolomite powder 100kg.Before combination
Manganese ore, light dolomite powder, the carbon dust respectively formed is stocked up by drying, broken, levigate be used as.
Table 4 is different sample point ladle chemistries.
The different sample point ladle chemistries of table 4
| Sampling spot | C/% | Si/% | Mn/% | P/% | S/% | T/℃ |
| Converter terminal | 0.08 | 0.004 | 0.08 | 0.017 | 0.008 | 1690 |
| After tapping | 0.11 | 0.59 | 1.25 | 0.017 | 0.007 | 1630 |
| After feeding powder | 0.24 | 0.61 | 1.41 | 0.021 | 0.008 | 1590 |
The material chemical component of addition is：Silicomanganese chemical composition：Si 18.69%, Mn 66.69%, P 0.137%, C
1.43%, S 0.0244%；Ferrosilicon chemical composition：Si 74.51%, Mn 0.12%, P 0.026%, C 0.17%, S
0.007%；Carbon dust chemical composition：Fixed carbon 93.67%, P 0.015%, S 0.21%；Lime：CaO 82.78%, SiO2:
3.11%, MgO 7.99%, Al2O31.19%, S 0.030%, P 0.006%；Manganese ore chemical composition：TMn 42.8%,
SiO216%, TFe 11.6%, P 0.13%, S 0.016%.
The tapping temperature of the present embodiment is controlled at 1670-1700 DEG C, and jetting pressure 0.18-0.22Mpa, dust flow
For 100kg/min, the injection time is 6min.
This example using apparatus of the present invention dust, and can to obtain increase manganese content be 0.16%, and manganese yield is
93.5%.
Embodiment 5
Dusting device employed in the present embodiment is same as Example 1.
In Argon station or LF processes, the pulverized limestone of proper ratio and the pulvis of fluorite composition are sprayed into powder spraying pot, is being mixed
It is preceding using lime and Fluorspar Powder by drying, broken, levigate as stocking up, it is levigate after granularity be less than 0.15mm, the composition of pulvis
For：Pulverized limestone accounts for 90%, and Fluorspar Powder accounts for 10%, and the weight for spraying into pulvis is 600kg.
Table 5 is different sample point ladle chemistries.
The different sample point ladle chemistries of table 5
| Sampling spot | C/% | Si/% | Mn/% | P/% | S/% | T/℃ |
| After converter tapping | 0.18 | 0.55 | 1.20 | 0.021 | 0.038 | 1680 |
| After dusting | 0.19 | 0.54 | 1.20 | 0.022 | 0.018 | 1630 |
Temperature is 1680 DEG C after converter tapping, and blowing powder pressure is 0.18-0.22Mpa, and the flow that dusts is 120kg/
Min, injection time are 5min；Ladle bottom blowing intensity is 0.008Nm3/t.min。
Molten steel desulfurizing rate after processing is：(0.038%-0.018%)/0.038% × 100%=53%, molten steel temperature drop
For 50 DEG C.
Embodiment 6
Dusting device employed in the present embodiment is same as Example 2.
After converter tapping, at Argon station, formed with the manganese mineral powder of powder spraying pot penetrating proper ratio, coke blacking, agstone
Pulvis, the manganese ore respectively formed before combination, agstone, coke blacking are by drying, broken, levigate as stock, after levigate
Granularity be less than 0.15mm, the composition of pulvis is：Manganese ore 60%, agstone 15%, compound conduct made of coke 25%
Pulvis, pulvis weight are 1000kg.
Table 6 is different sample point ladle chemistries.
The different sample point ladle chemistries of table 6
| Sampling spot | C/% | Si/% | Mn/% | P/% | S/% | T/℃ |
| After converter tapping | 0.18 | 0.59 | 1.23 | 0.019 | 0.011 | 1660 |
| After dusting | 0.27 | 0.62 | 1.37 | 0.021 | 0.010 | 1630 |
Add manganese ore chemical composition be：TMn 42.8%, SiO216%, TFe 11.6%, P 0.13%, S
0.016%；Coke blacking chemical composition：Fixed carbon 93.67%, P 0.015%, S 0.21%.
Temperature is 1660 DEG C, jetting pressure 0.18-0.24Mpa after converter tapping, and the flow that dusts is 160kg/min, spray
It is 7min to blow the time, and ladle bottom blowing argon gas intensity is 0.008Nm3/t.min；After processing, the manganese yield of molten steel is 82%.
Wherein manganese yield η Mn calculating formula is：
In formula：M is Metal Weight, kg；M is that manganese ore adds weight, kg；α be manganese ore in TMn contents, %；w([Mn])i
For initial molten steel manganese content, %；W ([Mn]) f is endpoint molten steel manganese content, %.
Embodiment 7
Dusting device employed in the present embodiment is same as Example 3.
After converter tapping, at Argon station, chromite ore fine, anthracite, the pulverized limestone composition of proper ratio are sprayed into powder spraying pot
Pulvis, the chromite ore fine respectively formed before combination, pulverized limestone, anchracite duff are stocked up by drying, broken, levigate be used as, after levigate
Granularity be less than 0.15mm, the composition of pulvis is：Chromite ore fine 70%, pulverized limestone 10%, compound made of anchracite duff 20%
As pulvis, pulvis weight is 800kg.
Table 7 is different sample point ladle chemistries.
The different sample point ladle chemistries of table 7
| Sampling spot | C/% | Si/% | Mn/% | Cr/% | P/% | S/% | T/℃ |
| After converter tapping | 0.21 | 0.52 | 1.21 | 0.02 | 0.019 | 0.011 | 1680 |
| After feeding powder | 0.24 | 0.55 | 1.22 | 0.14 | 0.021 | 0.014 | 1640 |
Add chrome ore chemical composition be：Cr2O346.13%；CaO 0.4%；SiO26.28%；C 0.074%；MgO
16.17%；TFe 15.04%；FeO 1.03%；Fe2O320.33%.
Temperature is 1640 DEG C, jetting pressure 0.18-0.23Mpa after converter tapping, and the flow that dusts is 130kg/min, spray
It is 6min to blow the time, and ladle bottom blowing argon gas intensity is 0.007Nm3/t.min；After processing, the chromium recovery rate of molten steel is 70%.
Wherein chromium recovery rate ηCrCalculating formula be：
In formula：M is Metal Weight, kg；M is that chrome ore adds weight, kg；α be chrome ore in TMn contents, %；w([Cr])i
For initial molten steel manganese content, %；w([Cr])fFor endpoint molten steel manganese content, %.
Embodiment 8
Dusting device employed in the present embodiment is same as Example 4.
It is outbound in RH, magnesium-silicon-iron powder of proper ratio and the pulvis of agstone composition are sprayed into powder spraying pot, is being mixed
Preceding magnesium-silicon-iron powder and agstone by drying, broken, levigate as stock, it is levigate after granularity be less than 0.15mm, pulvis
Composition be：Magnesium-silicon-iron powder 90%, agstone 10%, addition weight are 15kg.
Table 8 is different sample point ladle chemistries.
The different sample point ladle chemistries of table 8
| Sampling spot | C/% | Si/% | Mn/% | Mg/% | Ti/% | P/% | S/% | T/℃ |
| Before feeding powder | 0.15 | 0.40 | 1.34 | 0 | 0.001 | 0.016 | 0.009 | 1600 |
| After feeding powder | 0.15 | 0.41 | 1.32 | 0.0018 | 0.010 | 0.015 | 0.008 | 1590 |
The material chemical component of addition is：Mg accounts for 30% in magnesium-silicon-iron powder, and silicon accounts for 35%, and remaining is iron and impurity, RH
Tapping temperature is 1590 DEG C, jetting pressure 0.18-0.23Mpa, and the flow that dusts is 20kg/min, and the injection time is 1min, steel
Bag argon bottom-blowing intensity is 0.003Nm3/t.min；The recovery rate of magnesium metal is 66%.
Wherein magnesium recovery rate ηMgCalculating formula be：
In formula：M is Metal Weight, kg；M is that magnesium-silicon-iron adds weight, kg；α be magnesium-silicon-iron in Mg contents, %；w
([Mg])iFor initial molten steel manganese content, %；w([Mg])fFor endpoint molten steel manganese content, %.
The present invention cardinal principle be：The main mine phase composition of metallurgy manganese ore, by weight percentage for：Mn2O3Account for 10
~15%；MnSiO3Account for 25~35%；MnO2Account for 10~20%；MnCO3Account for 20~30% and Fe3O4Account for 10~20%；These ore deposits
Mn in phase2O3、MnO2、MnCO3Just it is easy to decompose within 1200 DEG C and manganese is reduced into by the carbon in furnace charge, and in manganese ore
MnSiO3Need to reduce at higher temperature and reducing atmosphere；And in pneumatic steelmaking clinker dioxide-containing silica compared with
Gao Shi, easily combined with manganese oxide, caused manganous silicate, be difficult again reduction, this is that pneumatic steelmaking Reduction of manganese ore manganese yield is low
Reason；, also can shadow if dioxide-containing silica is high in the slag of top meanwhile the manganese ore added in refining process is also easily combined with top slag
Ring recovery rate of the manganese in refining process.
In order to solve this problem, the present invention is considered when reducing manganese ore with addition of a certain amount of calcium oxide or magnesia (oxygen
The raw material for changing calcium and magnesia are taken from lime and/or light dolomite), the silica in manganous silicate is cemented out,
Following reaction occurs：
MnSiO3+ CaO=MnO+CaSiO3 (1)
MnSiO3+ MgO=MnO+MgSiO3 (2)
In steelmaking process, solid carbon, the silicon of carbon content, silicone content and addition in molten steel can be with (MnO) in molten steel
Generation reduction reaction, chemical equation are as follows：
(MnO)+[C]=[Mn]+CO △rGθ=268904-165.54T (3)
(MnO)+C(S)=[Mn]+CO △rGθ=290684-207.08T (4)
3 (MnO)+[Si]=(MnOSiO2)+2[Mn]△rGθ=-256390+77.77T (5)
3(MnO)+Si(S)=(MnOSiO2)+2[Mn]△rGθ=-205850+47.77T (6)
Can be calculated by formula (3)-(6), at 1400-1700 DEG C with (MnO) in carbon, Si reduction clinker from thermodynamics come
Say it is feasible, as shown in Figure 10,1550-1700 DEG C of refining process, molten steel silicone content, ferrosilicon and solid carbon have
Stronger (MnO) reducing power, the presence of these reducing agents, ensure that manganese ore completes the reduction of manganese ore within a short period of time.
It has also been found that, manganese ore adds preferably in steel-making after Converter or in refining procedure simultaneously, because in refining work
Manganese ore is added in sequence, mainly manganese ore is beneficial to reduction under the reducing conditions, and clinker FeO is very low in refining procedure, ＜ 1%；And turn
FeO is higher in stove or electric furnace process, ＞ 10%.
In addition to the selection Journal of Sex Research of material, in technique, the present invention is by designed device, mineral aggregate and reduction
The pulvis that materials etc. are fabricated to, which is added in smelting molten steel, to be reacted, and this area is usually added into manganese ore and reducing agent is all
Added from ladle mouth in the form of furnace charge, lack stirring, and cause manganese ore and reducing agent easily first to be reacted with top slag, and push up slag
Middle iron oxide content is higher, influences the rate of recovery of manganese ore, and addition cold burden can reduce liquid steel temperature more, and being added into LF can more
More consumption electric energy.
Method of the present invention more than can be passed through according to the concrete technology of steel mill, steel grade and appointed condition selection operation
The manganese ore that above-mentioned technique adds can obtain high manganese yield into refined molten steel, and the recovery rate of manganese is more than 90%.
In summary, the invention provides a kind of device and method of the safe and efficient side-blown injection refining of ladle, with
Common manganese ore direct alloying technique is compared, the stable device for obtaining manganese ore direct alloying technique process manganese yield of the invention and
Its method, the reaction time is short, and manganese yield is high, more suitable for the enterprise of no refining furnace (LF stoves), meanwhile, apparatus of the present invention
Safe, maintenance is easily, higher with bottom blowing stirring of inert gas gas interactions, reaction efficiency.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited to
This, any one skilled in the art the invention discloses technical scope in, the change that can readily occur in or replace
Change, should all be included within the scope of the present invention.
Claims (10)
1. a kind of device of the side-blown injection refining of safe and efficient ladle, it is characterised in that described device is located in ladle, institute
State to build inside ladle and have ladle brick, described device includes N number of element that dusts, N >=1；N number of element that dusts is partly or entirely embedding
Enter in N number of ladle brick；One end of N number of element that dusts communicates with inside the ladle, is sprayed for the ladle side
Pulvis is blown, the other end of N number of element that dusts for powder passage with outside powder feeder unit by being connected, the outside powder feeder unit
Arrival end is higher than the height of molten steel in the ladle.
A kind of 2. device of safe and efficient side-blown injection refining of ladle according to claim 1, it is characterised in that institute
State the element that dusts be arranged in the distance of the ladle bottom account for the ladle total height percentage be 20%~50%.
A kind of 3. device of safe and efficient side-blown injection refining of ladle according to claim 1, it is characterised in that institute
The angle of dusting for the element that dusts is stated as -40 °~40 °, the blowing direction of 0 ° of element that refers to dust is put down with the liquid level in the ladle
Together.
A kind of 4. device of safe and efficient side-blown injection refining of ladle according to claim 1, it is characterised in that institute
It is mono-layer tube or bilayer sleeve to state the element that dusts, and one end of the mono-layer tube or bimetallic tube is equal with the side of the ladle brick
Together, the other end of the mono-layer tube or bimetallic tube for powder passage with powder feeder unit outside the ladle by being connected.
A kind of 5. device of safe and efficient side-blown injection refining of ladle according to claim 1, it is characterised in that institute
Stating the element that dusts includes air chamber, powder inlet and for tube cell, and the air chamber, powder inlet for tube cell with being embedded in the ladle brick
In, one end of the powder inlet is connected with one end of the air chamber, and the other end of the air chamber is connected with described for tube cell, described
It is more than 1 for the number of tube cell；The other end of the powder inlet for powder passage with powder feeder unit outside the ladle by being connected.
A kind of 6. device of safe and efficient side-blown injection refining of ladle according to claim 1, it is characterised in that institute
Stating the element that dusts includes air chamber, powder inlet and for tube cell, described to be embedded in for tube cell in the ladle brick, the air chamber with it is described
Powder inlet not be embedded in the ladle brick in, one end of the powder inlet is connected with one end of the air chamber, the air chamber it is another
One end is connected with described for tube cell, and the number for tube cell is more than 1；The other end of the powder inlet by for powder passage with
Powder feeder unit is connected outside the ladle.
A kind of 7. method of safe and efficient side-blown injection refining of ladle according to claim 1-6, it is characterised in that
After the ladle for being provided with the unit that dusts enters Argon station, LF or RH processes, pass through the unit that dusts with outside dusting device
From side pulvis is sprayed into the ladle.
A kind of 8. method of safe and efficient side-blown injection refining of ladle according to claim 7, it is characterised in that institute
When stating the unit that dusts pulvis is sprayed into from side to the ladle, argon bottom-blowing strength control is in 0.003Nm in the ladle3/
T.min~0.008Nm3Between/t.min.
A kind of 9. method of safe and efficient side-blown injection refining of ladle according to claim 7, it is characterised in that institute
The pressure limit control for stating the unit blowing powder that dusts is controlled in 0.1Mpa~0.5Mpa, the time of the unit blowing powder that dusts
System is controlled in 10kg/min~150kg/min in 3min~10min, the range of flow that dusts.
A kind of 10. method of safe and efficient side-blown injection refining of ladle according to claim 7, it is characterised in that institute
It is the lime for molten steel desulfurizing processing to state pulvis, and addition is 1~10kg/t steel；Or the pulvis is the oxygen for molten steel
The metallurgical magnesium metal of compound, addition is 1~5kg/t steel；Or the pulvis is to remove the de- of steel inclusion for molten steel
Oxygen cleanser, addition are 1~8kg/t steel；Or the pulvis is the manganese ore or chrome ore DIRECT ALLOYING for realizing molten steel
Manganese mineral powder or chromite ore fine, the addition of the manganese mineral powder or chromite ore fine is 5~50kg/t steel.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109706288A (en) * | 2019-03-08 | 2019-05-03 | 东北大学 | A kind of side-blown injection refining molten steel device and method of ladle |
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