CN107779548B - 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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- CN107779548B CN107779548B CN201710914494.8A CN201710914494A CN107779548B CN 107779548 B CN107779548 B CN 107779548B CN 201710914494 A CN201710914494 A CN 201710914494A CN 107779548 B CN107779548 B CN 107779548B
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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 safe and efficient side-blown injection refining of ladle, described device is located in ladle, and building inside the ladle has ladle brick, and described device includes N number of element that dusts, N >=1；N number of dust or has fully embedded into N number of ladle brick element part；One end of N number of element that dusts is communicated with inside the ladle, for ladle side blowing powder, the other end of N number of element that dusts is connected by powder supply channel with external powder feeder unit, and the external 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 methods of safe and efficient side-blown injection refining of ladle.The present invention is dusted, and unit is easy to operate, and high-efficient, metallurgical effect is good, can directly obtain higher economic benefit；Compared with traditional method that pulvis is added by top, 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 the good advantage of removal steel inclusion effect.
Description
Technical field
The present invention relates to steelmaking technical field more particularly to a kind of devices of the side-blown injection refining of safe and efficient ladle
And method.
Background technique
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 with less-slag melting
Manganese ore direct alloying technique manganese yield in furnace is stablized 70% or so, can after preferable economic benefit.But domestic steel
The practical effect of enterprise is bad, manganese yield 10%~60%, the main reason is that, domestic iron and steel enterprises do not have mostly
There are 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, manganese yield is low, and unstable problem.Therefore, a kind of new approach of demand carries out manganese ore alloying, right
In manganese ore alloying technology using particularly important.
In terms of current manganese ore direct alloying technique technique, the mode of addition be smelt and tapping process in by top slag to
Be added in molten steel, the reaction being related to is reacted between " slag-steel ", this adding manner the disadvantage is that the manganese ore melting time it is long, in ladle
Mixing effect is poor, and dynamics is insufficient, and reaction interface area is small, needs to find out the adding manner for expanding reaction interface and technique side
Method.
Application No. is CN201110235141.8, a kind of entitled metal slit-type ladle bottom blowing powder injection apparatus, and
Application No. is CN201110234911.7, a kind of entitled ladle bottom blowing power injection device with whirlwind-type flow-smoothing gas storage chamber is all made of
The method of ladle bottom blowing is dusted, and can be well solved the problem of ladle mixing effect difference, 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.
Summary 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, which dusts, element part or has fully embedded into N number of institute
It states in ladle brick；One end of N number of element that dusts is communicated with inside the ladle, is ladle side blowing powder,
The other end of N number of element that dusts is connected by powder supply channel with external powder feeder unit, the external 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 highly-safe, maintenance is easy, and structure is simple, are easy production,
With bottom blowing stirring of inert gas gas interactions, reaction efficiency height.
Further, the element that dusts is arranged in the percentage that the ladle total height is accounted at a distance from the ladle bottom
Than being 20%~50%.
Beneficial effect using above-mentioned further scheme is: the present invention is by the original of this height of the position restriction for the element that dusts
Because being: when the position for the element that dusts is lower than 20%, the pulvis of blowing is easy to cause to impact to furnace bottom, influences the service life of ladle；
When the position for the element that dusts is higher than 50%, the pulvis sprayed cannot be covered all in the region of ladle bottom, be influenced entire
The reaction effect of ladle molten steel and spray.
Further, the angle of dusting of the element that dusts is -40 °~40 °, 0 ° of blowing direction for referring to the element that dusts with
Liquid level in the ladle is concordant.
Beneficial effect using above-mentioned further scheme is: the present invention will dust angle setting between ± 40 °, mainly
Purpose is to guarantee the molten steel of entire ladle and coming into full contact with for sprayed pulvis；Within 40 °, guarantee that sprayed pulvis exists
In liquid level, without going out liquid level；Within -40 °, guarantees that spray will not be flushed to ladle bottom, shadow is caused to the refractory material of bottom
It rings.
Further, the element that dusts is mono-layer tube or bilayer sleeve, one end and institute of the mono-layer tube or bimetallic tube
State the side flush of ladle brick, the other end of the mono-layer tube or bimetallic tube outside powder supply channel and the ladle by supplying
Powder device is connected.
The present invention uses mono-layer tube, is to reduce cost because mono-layer tube structure is simple；The present invention uses bimetallic tube, can
Guarantee that the normal ejection of pulvis will not influence total blowing effect if there is a pipeline obstruction.
Further, the element that dusts includes gas chamber, powder inlet and for tube cell, the gas chamber, powder inlet with for tube cell
Be embedded in the ladle brick, one end of the powder inlet is connected with one end of the gas chamber, the other end of the gas chamber with
Described to be connected for tube cell, the number for tube cell is greater than 1；The other end of the powder inlet by powder supply channel with it is described
Powder feeder unit is connected outside ladle.
The present invention unit that dusts is embedded in ladle brick by gas chamber, powder inlet and for tube cell, the advantage of doing so is that
In cylinder-packing, the brick of one piece of entirety is formed, can be carried out in advance, when use as other bricks, is normally carried out masonrys, operation
Simply.
Further, the element that dusts includes gas chamber, powder inlet and for tube cell, described to be embedded in the packet for tube cell
In lining brick, the gas chamber and the powder inlet are not embedded in the ladle brick, one end of the powder inlet and the gas chamber
One end is connected, and the other end of the gas chamber is connected with described for tube cell, and the number for tube cell is greater than 1；The powder inlet
The other end be connected by powder supply channel with ladle outside powder feeder unit.
Powder inlet and gas chamber are not embedded in ladle brick by the present invention unit that dusts, the advantage of doing so is that if pipeline
Blocking, the position that can be blocked check 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 equipped with the unit that dusts enters Argon
It stands, after LF or RH process, pulvis is sprayed into the ladle from side by the unit that dusts with external 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, when 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 to the ladle from side, argon bottom-blowing is strong in the ladle
Degree control is in 0.003Nm3/ t.min~0.008Nm3Between/t.min.
The present invention controls the intensity of argon bottom-blowing, can guarantee the mixing effect of molten steel, but it is big not will cause molten steel simultaneously
Area is exposed, avoids 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
In 3min~10min, the range of flow that dusts is controlled in 10kg/min~150kg/min for the time control of unit blowing powder.
The pressure that the present invention controls blowing powder can guarantee that pulvis can smoothly enter into molten steel, and control is dusted the time, can
Guarantee the requirement of refining time, rhythm.
Further, the pulvis is the lime handled for molten steel desulfurizing, and additional amount is 1~10kg/t steel；Or institute
The magnesium metal that pulvis is the Oxide Metallurgy for molten steel is stated, additional amount is 1~5kg/t steel；Or the pulvis is for steel
Water removes the deoxidation purificant of steel inclusion, and additional amount is 1~8kg/t steel；Or the pulvis is for realizing molten steel
The additional amount 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.
The invention has the benefit that
(1) present invention is dusted, and unit is easy to operate, and high-efficient, metallurgical effect is good, can directly obtain higher economic effect
Benefit；
(2) compared with traditional method that pulvis is added by top, the method for side-blown spray of the invention has slag gold
Reaction speed is fast, the reaction time is short, desulfurization and the good advantage of removal steel inclusion effect；
(3) compared with ladle bottom blowing mode, the device of the invention is highly-safe, maintenance is easy, is stirred with bottom blowing inert gas
Gas interactions are mixed, reaction efficiency is higher.
It in the present invention, can also be combined with each other between above-mentioned each technical solution, to realize more preferred assembled schemes.
Other features and advantages of the present invention will illustrate in the following description, also, certain advantages can become aobvious from specification
And it is clear to, or understand through the implementation of the invention.The objectives and other advantages of the invention can by written specification,
Specifically noted structure is achieved and obtained in claims and attached drawing.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is the device of the 1 side-blown injection refining of safe and efficient ladle of the embodiment of the present invention；
Fig. 2 is the device arrangement of the 1 side-blown injection refining of safe and efficient ladle of the embodiment of the present invention；
Fig. 3 is the powder feeder unit that 1 air brick of the embodiment of the present invention is embedded in multiple steel pipes with gas chamber；
Fig. 4 is the device of the 2 side-blown injection refining of safe and efficient ladle of the embodiment of the present invention；
Fig. 5 is the device arrangement of the 2 side-blown injection refining of safe and efficient ladle of the embodiment of the present invention；
Fig. 6 is the powder feeder unit that 2 air brick of the embodiment of the present invention is embedded in single steel pipe；
Fig. 7 is the device of the 3 side-blown injection refining of safe and efficient ladle of the embodiment of the present invention；
Fig. 8 is the device arrangement of the 3 side-blown injection refining of safe and efficient ladle of the embodiment of the present invention；
Fig. 9 is the powder feeder unit that 3 air brick of the embodiment of the present invention is embedded in bilayer sleeve；
Figure 10 is the powder feeder unit that 4 gas chamber of the embodiment of the present invention is embedded in multiple steel pipes in external, air brick；
Figure 11 is that Si, C restore the free energy of MnO and the relationship thermomechanical curve figure of temperature.
In figure, 1- involucrum, 2- ladle brick, 3- powder supply channel, 4- powder inlet, 5- gas chamber, 6- is for tube cell, 7- single tube, outside 8-
Pipe, 9- inner tube, 10- inner tube refractory material filler.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part,
And it is not intended to limit the scope of the present invention together with embodiments of the present invention for illustrating the principle of the present invention.
Specific embodiments of the present invention by being tested in the device of the side-blown injection refining of safe and efficient ladle,
It is reacted in 150t ladle simultaneously.
Embodiment 1
The present embodiment is directed to 150t ladle, is sprayed using the device of the side-blown injection refining of safe and efficient ladle into ladle
Powder, as shown in Figure 1, building inside the involucrum 1 of ladle has ladle brick 2, by 1 piece of insertion band for being 800mm apart from ladle bottom L
There is the ladle brick of the steel pipe of gas chamber as powder feeder unit, one end of powder feeder unit is connected with outside involucrum 1 by powder supply channel 3,
Pulvis, to being blown into inside ladle brick 2, is powder supply inside ladle outside involucrum 1；It is noted that powder supply channel 3 passes through packet
Gap between shell 1 and ladle brick 2 is pierced by involucrum 1, and powder supply channel 3 is pierced by the position of involucrum 1 and 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, powder feeder unit is 800mm with ladle bottom distance L, 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 of 1 piece of ladle brick, powder inlet, gas chamber and 3 for tube cell, into
Powder mouth, gas chamber and 3 are entirely embedded in ladle brick for tube cell, meanwhile, one end of powder inlet is connected with one end of gas chamber, separately
One end is connected with powder supply channel 3, the other end of gas chamber be connected respectively with 3 for tube cell, 3 other ends and packet for tube cell
The flush of lining brick；It is noted that 3 calibers for tube cell are 10mm.
Silicomanganese 3040kg, ferrosilicon 500kg, carburant 20kg are added in converter tapping for the present embodiment, after tapping, are blowing
Argon station or LF process, sprayed into powder spraying pot into ladle the manganese mineral powder of proper ratio, carbon dust, pulverized limestone, ferrosilicon composition powder
Agent, the composition of pulvis are as follows: manganese ore 58.34%, pulverized limestone 11.67%, carbon dust 23.34%, mixture made of ferrosilicon 6.65%
As pulvis, the manganese mineral powder that respectively forms before mixing, pulverized limestone, carbon dust are by drying, broken, levigate as stock；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 determines the suitable quantity that spray is added；Using the benefit that apparatus of the present invention are dusted 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 are as follows: silicomanganese chemical component is by percentage to the quality are as follows: Si
18.69%, Mn 66.69%, P 0.137%, C 1.43%, S 0.0244%；Ferrosilicon chemical component: Si 74.51%, Mn
0.12%, P 0.026%, C 0.17%, S 0.007%；Carbon dust chemical component: 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 component: TMn 42.8%, SiO216%, TFe 11.6%, P 0.13%, S 0.016%.Because of silicon
There are also some other impurity in manganese, ferrosilicon, carbon dust and lime, general ingredient total amount cannot 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 blowing time is 5min.
This example, which dust using apparatus of the present invention, can get that increase manganese content be 0.13%, and manganese yield is
91.1%.
Embodiment 2
The present embodiment is directed to 150t ladle, is sprayed using the device of the side-blown injection refining of safe and efficient ladle into ladle
Powder, as shown in figure 4, building inside the involucrum 1 of ladle has ladle brick 2, by 2 pieces of insertion bands for being 800mm apart from ladle bottom L
There is the ladle brick of the steel pipe of gas chamber as powder feeder unit, gas supply respectively inside ladle；The structure of 2 powder feeder units is identical, i.e.,
One end of powder feeder unit with pass through powder supply channel 3 outside involucrum 1 and be connected, pulvis is outside involucrum 1 to blowing inside ladle brick 2
Enter, is powder supply inside ladle；It is noted that powder supply channel 3 is pierced by involucrum 1 by the gap between involucrum 1 and ladle brick 2,
And powder supply channel 3 is pierced by the position of involucrum 1 and 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, powder feeder unit is 800mm, dust direction and the water of 2 powder feeder units with ladle bottom distance L
Square to β at 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, the other is -15 °.
As shown in fig. 6, each powder feeder unit of the present embodiment is made of 1 piece of ladle brick and 1 single tube, single tube is embedded into packet
In lining brick, and one end of single tube is connected with powder supply channel 3, the other end of single tube and the flush of ladle brick, is to supply in ladle
Powder；It is noted that the caliber of single tube is 12mm.
Silicomanganese 2980kg, ferrosilicon 600kg, carburant 30kg are added in converter tapping for the present embodiment.After tapping, blowing
Argon station or LF process spray into manganese mineral powder, light dolomite powder, pulverized limestone and the ferrosilicon of proper ratio with powder spraying pot into ladle
The pulvis of composition, the composition of pulvis are as follows: manganese ore 55.56%, light dolomite powder 14.77%, carbon dust 27.78%, ferrosilicon
Mixture made of 7.41% is as pulvis, wherein manganese ore 600kg is added, SiFe powder 80kg, carbon dust 300kg, and light dolomite
Powder 100kg, the manganese ore respectively formed before mixing, 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 are as follows: silicomanganese chemical component: Si 18.69%, Mn
66.69%, P 0.137%, C 1.43%, S 0.0244%；Ferrosilicon chemical component: Si 74.51%, Mn 0.12%, P
0.026%, C 0.17%, S 0.007%；Carbon dust chemical component: 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 component: 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 blowing time is 6min.
This example, which dust using apparatus of the present invention, can get that increase manganese content be 0.16%, and manganese yield is
93.5%.
Embodiment 3
The present embodiment is directed to 150t ladle, is sprayed using the device of the side-blown injection refining of safe and efficient ladle into ladle
Powder, as shown in fig. 7, building inside the involucrum 1 of ladle has ladle brick 2, by 3 pieces of insertion bands for being 800mm apart from ladle bottom L
There is the ladle brick of the steel pipe of gas chamber as powder feeder unit, gas supply respectively inside ladle；The structure of 3 powder feeder units is identical, i.e.,
One end of powder feeder unit with pass through powder supply channel 3 outside involucrum 1 and be connected, pulvis is outside involucrum 1 to blowing inside ladle brick 2
Enter, is powder supply inside ladle；It is noted that powder supply channel 3 is pierced by involucrum 1 by the gap between involucrum 1 and ladle brick 2,
And powder supply channel 3 is pierced by the position of involucrum 1 and 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, powder feeder unit is 800mm, dust direction and the water of 3 powder feeder units with ladle bottom distance L
Square to β at -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 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 powder supply channel 3, the other end of bilayer sleeve and the table of ladle brick
Face is concordant, is powder supply in ladle；It is noted that bilayer sleeve includes inner and outer tubes, inner tube is located at the inside of outer tube, interior
Refractory material filler is filled in pipe, appearance diameter is 22mm, diameter of inner pipe 10mm, the present embodiment selection double braid covering
Pipe.It is noted that the present embodiment is that will not influence total spray if there is a line clogging using the benefit of bilateral casing
Blow effect.
Silicomanganese 3080kg, ferrosilicon 600kg, carburant 20kg are added in converter tapping for the present embodiment, after tapping, are blowing
Argon station or LF process spray into the powder that manganese mineral powder, carbon dust, pulverized limestone and the ferrosilicon of proper ratio form with powder spraying pot into ladle
Agent, the composition of pulvis are as follows: manganese ore 52.25%, pulverized limestone 10.45%, carbon dust 31.35%, mixture made of ferrosilicon 5.96%
As pulvis, wherein manganese ore 500kg, SiFe powder 57kg, carbon dust 300kg, lime 100kg, the manganese respectively formed before mixing is added
Mine, pulverized limestone, carbon dust are stocked up by drying, broken, levigate be used as.Partial size after levigate be less than 0.15mm (100 mesh with
It is interior), guarantee pulvis in this way is uniformly mixed.It is noted that not having to levigate when using ferrosilicon powder.
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 are as follows: silicomanganese chemical component: Si 18.69%, Mn 66.69%, P 0.137%, C
1.43%, S 0.0244%；Ferrosilicon chemical component: Si 74.51%, Mn 0.12%, P 0.026%, C 0.17%, S
0.007%；Carbon dust chemical component: 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 component: 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 blowing time is 5min.
This example, which dust using apparatus of the present invention, can get that increase manganese content be 0.13%, and manganese yield is
91.1%.
Embodiment 4
The present embodiment is directed to 150t ladle, is sprayed using the device of the side-blown injection refining of safe and efficient ladle into ladle
Powder, as shown in Figure 1, building inside the involucrum 1 of ladle has ladle brick 2, by 1 piece of insertion band for being 800mm apart from ladle bottom L
There is the ladle brick of the steel pipe of gas chamber as powder feeder unit, one end of powder feeder unit is connected with outside involucrum 1 by powder supply channel 3,
Pulvis, to being blown into inside ladle brick 2, is powder supply inside ladle outside involucrum 1；It is noted that powder supply channel 3 passes through packet
Gap between shell 1 and ladle brick 2 is pierced by involucrum 1, and powder supply channel 3 is pierced by the position of involucrum 1 and 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, powder feeder unit is 800mm with ladle bottom distance L, 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 of 1 piece of ladle brick, powder inlet, gas chamber and 3 for tube cell, and 3
It is a to be embedded in ladle brick for tube cell, and powder inlet and gas chamber are not embedded into ladle brick, meanwhile, one end of powder inlet and gas
One end of room is connected, and the other end is connected with powder supply channel 3, and the other end of gas chamber is connected with 3 for tube cell respectively, and 3 for 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 when the present embodiment converter tapping, after tapping, in Argon
Stand or LF process, with powder spraying pot spray into the manganese mineral powder of proper ratio, light dolomite powder, carbon dust, ferrosilicon composition pulvis, powder
The composition of agent are as follows: manganese ore 52.17%, light dolomite powder 8.70%, carbon dust 30.43%, mixture made of ferrosilicon 8.70%
As pulvis, wherein manganese ore 600kg, SiFe powder 100kg, carbon dust 350kg, light dolomite powder 100kg is added.Before mixing
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 are as follows: silicomanganese chemical component: Si 18.69%, Mn 66.69%, P 0.137%, C
1.43%, S 0.0244%；Ferrosilicon chemical component: Si 74.51%, Mn 0.12%, P 0.026%, C 0.17%, S
0.007%；Carbon dust chemical component: 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 component: 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 blowing time is 6min.
This example, which dust using apparatus of the present invention, can get that 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 process, the pulverized limestone of proper ratio and the pulvis of fluorite composition are sprayed into powder spraying pot, is being mixed
It is preceding by 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
Are as follows: 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, blowing time are 5min；Ladle bottom blowing intensity is 0.008Nm3/t.min。
Molten steel desulfurizing rate that treated are as follows: (0.038%-0.018%)/0.038% × 100%=53%, molten steel temperature drop
It is 50 DEG C.
Embodiment 6
Dusting device employed in the present embodiment is same as Example 2.
After converter tapping, at Argon station, manganese mineral powder, the coke blacking, agstone composition of proper ratio are sprayed into powder spraying pot
Pulvis, the manganese ore respectively formed before mixing, agstone, coke blacking are by drying, broken, levigate as stock, after levigate
Granularity be less than 0.15mm, the composition of pulvis are as follows: manganese ore 60%, agstone 15%, mixture 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 |
The chemical component of manganese ore is added are as follows: TMn 42.8%, SiO216%, TFe 11.6%, P 0.13%, S
0.016%；Coke blacking chemical component: 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
Blowing the time is 7min, and ladle bottom blowing argon gas intensity is 0.008Nm3/t.min；After processing, the manganese yield of molten steel is 82%.
The wherein calculating formula of manganese yield η Mn are as follows:
In formula: M is Metal Weight, kg；M is that weight, kg is added in manganese ore；α is TMn content in manganese ore, %；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 mixing, 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 are as follows: chromite ore fine 70%, pulverized limestone 10%, mixture 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 |
The chemical component of chrome ore is added are as follows: 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
Blowing the time is 6min, 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 are as follows:
In formula: M is Metal Weight, kg；M is that weight, kg is added in chrome ore；α is TMn content in chrome ore, %；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, are 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 are as follows: magnesium-silicon-iron powder 90%, agstone 10%, addition weight be 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 are as follows: Mg accounts for 30% in magnesium-silicon-iron powder, and silicon accounts for 35%, 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 blowing time is 1min, steel
Packet argon bottom-blowing intensity is 0.003Nm3/t.min；The recovery rate of magnesium metal is 66%.
Wherein magnesium recovery rate ηMgCalculating formula are as follows:
In formula: M is Metal Weight, kg；M is that weight, kg is added in magnesium-silicon-iron；α is Mg content in magnesium-silicon-iron, %；w
([Mg])iFor initial molten steel manganese content, %；w([Mg])fFor endpoint molten steel manganese content, %.
Cardinal principle of the invention are as follows: the main mine phase composition of metallurgical manganese ore, by weight percentage are as follows: Mn2O3Account for 10
~15%；MnSiO3Account for 25~35%；MnO2Account for 10~20%；MnCO3Account for 20~30% and Fe3O4Account for 10~20%；These mines
Mn in phase2O3、MnO2、MnCO3It is just easy to decompose within 1200 DEG C and manganese is reduced by the carbon in furnace charge, and in manganese ore
MnSiO3It needs to restore at higher temperature and reducing atmosphere；And in pneumatic steelmaking clinker dioxide-containing silica compared with
Gao Shi, easily in conjunction with manganese oxide, the manganous silicate of generation, and be difficult to restore, this is that pneumatic steelmaking Reduction of manganese ore manganese yield is low
Reason；Meanwhile also Yi Yuding slag combines the manganese ore being added in refining process, it, also can shadow if dioxide-containing silica is high in the slag of top
Ring recovery rate of the manganese in refining process.
In order to solve this problem, the present invention considers when restoring 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
Reduction reaction occurs, chemical equation is 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
The reducing power of stronger (MnO), the presence of these reducing agents guarantee that manganese ore completes the reduction of manganese ore within a short period of time.
It has also been found that, manganese ore is added preferably after Converter or in refining procedure in steel-making simultaneously, because in refining work
Manganese ore is added in sequence, mainly manganese ore is conducive to restore under the reducing conditions, and clinker FeO is very low in refining procedure, < 1%；And turn
FeO higher, > 10% in furnace or electric furnace process.
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 field is usually added into manganese ore and reducing agent is all
It is added in the form of furnace charge from ladle mouth, lacks stirring, and manganese ore and reducing agent is caused to be easy first to react 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 mostly can reduce liquid steel temperature, being added into LF can more
More consumption electric energy.
The present invention pass through more than method can according to the concrete technology of steel mill, steel grade and appointed condition selection operation, pass through
The manganese ore that above-mentioned technique is added can get high manganese yield into refined molten steel, and the recovery rate of manganese is greater than 90%.
In conclusion the present invention provides a kind of device and method of safe and efficient side-blown injection refining of ladle, with
Common manganese ore direct alloying technique is compared, it is of the invention stablize the device for obtaining manganese ore direct alloying technique process manganese yield and
Its method, the reaction time is short, and manganese yield is high, more suitable for the enterprise of no refining furnace (LF furnace), meanwhile, apparatus of the present invention
Highly-safe, maintenance is easy, and with bottom blowing stirring of inert gas gas interactions, reaction efficiency is higher.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited to
This, anyone skilled in the art in the technical scope disclosed by the present invention, the variation that can readily occur in or replaces
It changes, should be covered by the protection scope of the present invention.
Claims (2)
1. a kind of device of the side-blown injection refining of safe and efficient ladle, which is characterized in that described device is located in ladle, institute
It states to build inside ladle and has ladle brick, described device includes N number of element that dusts, N=1 or 2 or 3；It is described it is N number of dust element part or
It has fully embedded into N number of ladle brick；One end of N number of element that dusts is communicated with inside the ladle, is the ladle
The other end of side blowing powder, N number of element that dusts is connected by powder supply channel with external powder feeder unit, the external confession
Powder device portal end is higher than the height of molten steel in the ladle；
The element that dusts be arranged in accounted at a distance from the ladle bottom ladle total height percentage be 20%~
50%；
The angle of dusting of the element that dusts is -40 °~40 °, and 0 ° refers in the blowing direction and the ladle of the element that dusts
Liquid level is concordant；
The element that dusts includes gas chamber, powder inlet and for tube cell, the gas chamber, powder inlet and is embedded in the packet for tube cell
In lining brick, one end of the powder inlet is connected with one end of the gas chamber, and the other end of the gas chamber is connected with described for tube cell,
The number for tube cell is greater than 1；The other end of the powder inlet passes through powder feeder unit outside powder supply channel and the ladle
It is connected；
Insertion is arranged 1 with the ladle brick for tube cell of gas chamber, and ladle brick and ladle trunnion angle α are 60 °, or insertion has
The ladle brick for tube cell of gas chamber is arranged 2, and ladle brick and ladle trunnion angle α are respectively 45 ° and 135 °, or insertion has gas
The ladle brick for tube cell of room is arranged 3, and ladle brick and ladle trunnion angle α are respectively 45 °, -45 ° and 135 °.
2. a kind of method of the side-blown injection refining of safe and efficient ladle, which is characterized in that using as described in claim 1
The device of the side-blown injection refining of ladle, described method includes following steps: when the ladle for being equipped with the element that dusts enter Argon station,
After LF or RH process, pulvis is sprayed into the ladle from side by the element that dusts with external dusting device；
When the element that dusts sprays into pulvis to the ladle from side, argon bottom-blowing strength control exists in the ladle
0.003Nm3/ t.min~0.008Nm3Between/t.min；
The pressure limit of the element blowing powder that dusts is controlled in 0.1Mpa~0.5Mpa, the element blowing powder that dusts
Time control is controlled in 3min~10min, the range of flow that dusts in 10kg/min~150kg/min；
The pulvis is the lime handled for molten steel desulfurizing, and additional amount is 1~10kg/t steel；Or the pulvis is for steel
The magnesium metal of the Oxide Metallurgy of water, additional amount are 1~5kg/t steel；Or the pulvis is to remove in steel to be mingled with for molten steel
The deoxidation purificant of object, additional amount are 1~8kg/t steel；Or the pulvis is direct for realizing the manganese ore or chrome ore of molten steel
The additional amount of the manganese mineral powder or chromite ore fine of alloying, the manganese mineral powder or chromite ore fine is 5~50kg/t steel.
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| CN1354262A (en) * | 2000-11-16 | 2002-06-19 | 承德钢铁集团有限公司 | Topside multiple blowing converter process |
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