CN107779550A - A kind of method that molten steel manganeisen addition is reduced in refining process - Google Patents
A kind of method that molten steel manganeisen addition is reduced in refining process Download PDFInfo
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- CN107779550A CN107779550A CN201710914240.6A CN201710914240A CN107779550A CN 107779550 A CN107779550 A CN 107779550A CN 201710914240 A CN201710914240 A CN 201710914240A CN 107779550 A CN107779550 A CN 107779550A
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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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
- C21C7/0006—Adding metallic additives
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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
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
Abstract
The present invention relates to a kind of method that molten steel manganeisen addition is reduced in refining process, comprise the following steps：Step 1, in converter tapping process, deoxidation and partially-alloyed is carried out to molten steel；Step 2, enter the station at Argon station or LF, pulvis is sprayed into ladle and carries out manganese ore alloying processing.The method of efficient reduction molten steel manganeisen addition is simple to operate in a kind of refining process of the present invention, and effect is good, can directly obtain higher economic benefit；Compared with common manganese ore direct alloying technique, the stable devices and methods therefor for obtaining manganese ore direct alloying technique process manganese yield of the invention, the reaction time is short, and manganese yield is high, more suitable for the enterprise of no refining furnace.
Description
Technical field
The present invention relates to molten steel manganeisen addition is reduced in steelmaking technical field, more particularly to a kind of refining process
Method.
Background technology
Manganese ore direct alloying technique technology is will directly to contain manganese element mineral matter to add in converter, utilizes element in steel or outer
Add the manganese in reducing agent reduction mineral, the alloying of molten steel is completed so as to allow the manganese in manganese ore to enter in molten steel.
Compared with conventional alloys chemical industry skill, manganese ore direct alloying technique technique has advantages below：
(1) Mn series alloy smelting is eliminated, the melting of manganese ore and reduction are transferred in converter and completed, so as to save
Energy resource consumption in ferroalloy smelting and alloying process；
(2) Mn series alloy smelting is eliminated, technological process is shortened, so as to reduce the pollution to environment, alleviates ring
Border load；
(3) save and reduce Mn series alloy consumption so that the cost of alloying is greatly lowered, and can be brought to steel plant
Economic benefit.
In terms of the applicable cases of manganese ore direct alloying technique technology, the technology is mainly used in convertor steelmaking process.Japanese steel
The manganese ore direct alloying technique manganese yield that iron enterprise is carried out on the basis of based on molten iron pretreatment and less-slag melting in converter is stable
70% or so, can after preferable economic benefit.But the practical effect of domestic iron and steel enterprises is bad, and manganese yield exists
10%~60%, its main cause is the problems such as quantity of slag is big, slag beneficiation is strong when converter carries out manganese ore direct alloying technique,
The problem of manganese yield is low, and unstable.
Therefore, find a kind of new approach and carry out manganese ore alloying, the application for manganese ore alloying technology is particularly important.
The content of the invention
In view of above-mentioned analysis, the present invention is intended to provide reducing the side of molten steel manganeisen addition in a kind of refining process
Method, to solve, existing manganese ore direct alloying technique technology quantity of slag when converter carries out manganese ore direct alloying technique is big, slag beneficiation
The problem of strong and cause manganese yield low, and unstable.
The purpose of the present invention is mainly achieved through the following technical solutions：
A kind of method that molten steel manganeisen addition is reduced in refining process, comprises the following steps：
Step 1, in converter tapping process, deoxidation and partially-alloyed is carried out to molten steel；
Step 2, enter the station at Argon station or LF, pulvis is sprayed into ladle and carries out manganese ore alloying processing.
The present invention has the beneficial effect that：The present invention is in converter tapping process and at Argon station or LF stations progress alloying
Reason, high manganese yield can be obtained, and then obtain higher economic benefit.
Further, in the step 1, silicomanganese, ferrosilicon and carburant are added in converter tapping part conjunction is carried out to molten steel
Aurification, the addition scope of the silicomanganese is 0~100kg/t steel；The addition scope of the ferrosilicon is 0~100kg/t steel；Institute
The addition scope for stating carburant is 0~90kg/t steel.
It is using the above-mentioned further beneficial effect of scheme：Silicomanganese is added in converter tapping process, the benefit of ferrosilicon is
Increase the content of manganese in molten steel, to meet requirement of the molten steel composition to manganese content；Carburant is added in converter tapping process
Benefit is to increase the content of manganese in molten steel, to meet the requirement of molten steel composition；Manganese content in the present invention in molten steel is all with spray
The method addition of agent, can cause refining time to extend, and temperature drop is serious, therefore, first be added during converter tapping most of
Alloy, other parts add in refining process.
Further, in the step 2, the pulvis be manganese mineral powder, pulverized limestone and carbonaceous material mixture, the mixing
The addition scope of thing is 1~50kg/t steel.
These mixtures are added in the present invention can substitute 0.1-60% silicomangan, can save production cost 1-15
Member/t steel.
Further, in the mixture, by mass percentage, the addition of the manganese mineral powder is 40%~85%,
The addition of the carbonaceous material is 10%~40%, and the addition of the pulverized limestone is 0.1%~20%；Above-mentioned each component
Mass fraction sum is 100%.
The benefit that manganese mineral powder, carbonaceous material and pulverized limestone of the present invention add is to increase the percent reduction of manganese ore, reduces silicomanganese and closes
Gold, reach the purpose for reducing the energy resource consumption in silicomangan production.
Further, in the step 2, the pulvis is the mixture of manganese mineral powder, light dolomite powder and carbonaceous material,
The addition scope of the mixture is 1~50kg/t steel.
The present invention, which adds these mixtures, can substitute 0.1-60% silicomangan；Manganese mineral powder of the present invention, light-burned white clouds
The benefit that stone flour and carbonaceous material add is to increase the percent reduction of manganese ore, reduces silicomangan, and reaching reduces silicomangan production
In energy resource consumption purpose.
Further, in the mixture, by mass percentage, the addition of the manganese mineral powder is 40%~85%,
The addition of the carbonaceous material is 10%~40%, and the addition of the light dolomite powder is 0.1%~20%；It is above-mentioned each
The mass fraction sum of component is 100%.
Manganese mineral powder of the present invention, carbonaceous material, light dolomite powder can increase the percent reduction of manganese ore, reduce silicomangan,
Reaching reduces the purpose of the energy resource consumption in silicomangan production, while adds magnesian and advantageously reduce to tympaning
Corrode, reduce foreign impurity and be brought into molten steel.
Further, in the step 2, the pulvis is needed before penetrating by drying, crushing, milling processing, after milling
The granularity of the pulvis is less than 0.15mm.
The present invention is dried to powder, crushed, the benefit for the processing that is milled：It is to reduce moisture pair in compound to carry out drying
The influence of molten steel, that is, reduce bringing into for hydrogen content；Carry out the broken fully contact and pulvis composition between guarantee pulvis when handling that be milled
Uniformly, the abundant progress of Reduction of manganese ore is so advantageous to；Granularity is less than 0.15mm after milling, i.e., is to ensure less than 100 mesh
Contacted between pulvis abundant, there is provided the dynamic conditions reacted between slag steel, offer guarantor is smoothed out for Alloying Treatment of the present invention
Barrier.
Further, in the step 2, the pulvis is sprayed into the side of the ladle by the element that dusts, the powder
The pressure limit that agent sprays into is controlled in 0.05Mpa~0.55Mpa, and the injection time control of the pulvis is in 1min~15min, institute
The range of flow for stating pulvis is controlled in 1kg/min~200kg/min；It is when spraying into pulvis, the argon bottom-blowing of the ladle is strong
Degree control is in 0.003Nm3/ t.min~0.008Nm3/t.min。
The present invention is when blowing powder by steel ladle bottom argon blowing gas control system in 0.003Nm3/ t.min~0.008Nm3/
T.min, its main purpose are to improve the dynamic conditions of Reduction of manganese ore, promote the stirring of ladle, increase reaction interface area；Bottom
Intensity is blown in 0.008Nm3Within/t.min, it is therefore an objective to prevent the big flow of molten steel from stirring, molten steel is exposed in atmosphere, absorbs empty
Nitrogen content in gas, molten steel nitrogen pick-up is caused, influence the quality of molten steel；Control to pressure is to ensure that pulvis is smoothly sprayed into molten steel,
Promote the reduction reaction of manganese ore；Control to the time is to meet the requirement of rhythm of production.
Further, the element that dusts has N number of, N >=1；N number of element that dusts partly or entirely is embedded in N number of cylinder-packing
In brick；One end of N number of element that dusts communicates with inside the ladle, is ladle side blowing powder, described N number of
Dust element the other end by being connected with outside powder feeder unit for powder passage, the height height of the outside powder feeder unit arrival end
The height of molten steel in the ladle.
The present invention is dusted, and element is safe, it is easy and simple in construction to safeguard, easily makes, is stirred with bottom blowing inert gas
Gas interactions are mixed, reaction efficiency is high.
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%.
Beneficial effects of the present invention are：
(1) method of efficient reduction molten steel manganeisen addition is simple to operate in a kind of refining process of the present invention, effect
Fruit is good, can directly obtain higher economic benefit；
(2) compared with common manganese ore direct alloying technique, the stable manganese ore direct alloying technique process manganese that obtains of the invention is received
The devices and methods therefor of yield, the reaction time is short, and manganese yield is high, more suitable for the enterprise of no refining furnace (LF stoves).
In the present invention, it can also be mutually combined between above-mentioned each technical scheme, to realize more preferred compositions schemes.This
Other feature and advantage of invention will illustrate in the following description, also, certain advantages can become from specification it is aobvious and
It is clear to, or is understood by implementing the present invention.The purpose of the present invention and other advantages can by write specification, right
Specifically noted structure is realized and obtained in claim 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 that Si, C reduce MnO free energy and the relation thermomechanical curve figure of temperature；
Fig. 2 is the device of the side-blown injection refining of safe and efficient ladle of the embodiment of the present invention 1；
Fig. 3 is the device arrangement of the side-blown injection refining of safe and efficient ladle of the embodiment of the present invention 1；
Fig. 4 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. 5 is the device of the side-blown injection refining of safe and efficient ladle of the embodiment of the present invention 2；
Fig. 6 is the device arrangement of the side-blown injection refining of safe and efficient ladle of the embodiment of the present invention 2；
Fig. 7 is the powder feeder unit that the air brick of the embodiment of the present invention 2 is embedded in single steel pipe；
Fig. 8 is the device of the side-blown injection refining of safe and efficient ladle of the embodiment of the present invention 3；
Fig. 9 is the device arrangement of the side-blown injection refining of safe and efficient ladle of the embodiment of the present invention 3；
Figure 10 is the powder feeder unit that the air brick of the embodiment of the present invention 3 is embedded in bilayer sleeve；
Figure 11 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；
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, is not intended to limit the scope of the present invention.
The cardinal principle of the method for reduction molten steel manganeisen addition is in a kind of refining process of the present invention：Metallurgy manganese
The main mine phase composition of ore deposit, 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%；Mn in these ore deposit phases2O3、MnO2、MnCO3Within 1200 DEG C just
It is easy to decompose and manganese is reduced into by the carbon in furnace charge, and to the MnSiO in manganese ore3Need in higher temperature and reducing atmosphere
It is lower to reduce；And when dioxide-containing silica is higher in pneumatic steelmaking clinker, easily combined with manganese oxide, caused manganous silicate, again
It is difficult to reduce, this is the reason for pneumatic steelmaking Reduction of manganese ore manganese yield is low；Meanwhile the manganese ore added in refining process is also easy
Combined with top slag, if dioxide-containing silica is high in the slag of top, can also influence 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)
It can be calculated by formula (3)-(6), at 1400-1700 DEG C with (MnO) in carbon, Si reduction clinker for thermodynamics
It is feasible, as shown in Figure 1,1550-1700 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 is added preferably, because in refining procedure in steel-making after Converter or in refining procedure simultaneously
Middle addition manganese ore, mainly manganese ore are beneficial to reduction under the reducing conditions, and clinker FeO is very low in refining procedure, ＜ 1%；And converter
Or FeO is higher in electric furnace process, ＞ 10%.
In addition to the selection Journal of Sex Research of material, in technique, the present invention uses mineral aggregate and reduction by designed device
The pulvis that material etc. is fabricated to, which is added in smelting molten steel, to be reacted, and it is all from steel that this area, which is usually added into manganese ore and reducing agent,
Bag mouth is added in the form of furnace charge, lacks stirring, and causes manganese ore and reducing agent easily first to be reacted with top slag, and is pushed up in slag and aoxidized
Iron content is higher, influences the rate of recovery of manganese ore, and addition cold burden can reduce liquid steel temperature more, and adding meeting into LF, more consumption is 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%.
The specific embodiment of the present invention, disclose the side that molten steel manganeisen addition is reduced in a kind of refining process
Method, by being tested in the device of the side-blown injection refining of safe and efficient ladle, while carried out instead in 150t ladles
Should.
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 Fig. 2 being built inside the involucrum 1 of ladle has ladle brick 2, it will be carried apart from 1 piece of insertion that ladle bottom L is 800mm
The ladle brick of 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, powder
Agent outside involucrum 1 to being blown into inside ladle brick 2, to supply powder inside ladle；It is noted that for powder passage 3 by involucrum 1 with
Space between 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
Higher than the upper surface of molten steel, to prevent the leakage of molten steel；
As shown in figure 3, 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 4, 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, the other end
Be connected with for powder passage 3, the other end of air chamber with being connected respectively with 3 confession tube cells, the other ends of 3 confession tube cells and ladle brick
Flush；It is noted that 3 calibers for tube cell are 10mm.
The present embodiment adds silicomanganese 3040kg, ferrosilicon 500kg, carburant 20kg, silicomanganese chemical composition in converter tapping
It is by percentage to the quality：Si 18.69%, Mn 66.69%, P 0.137%, C 1.43%, S 0.0244%；After tapping,
In Argon station or LF processes, the manganese mineral powder of proper ratio, carbon dust, lime are sprayed into ladle by powder feeder unit with powder spraying pot
The pulvis of powder, ferrosilicon composition, the composition of pulvis are by mass percentage：Manganese ore 58.34%, pulverized limestone 11.67%, carbon dust
23.34%, as pulvis, the manganese mineral powder respectively formed before combination, pulverized limestone, carbon dust pass through compound made of ferrosilicon 6.65%
Drying, broken, levigate be used as are stocked up；Granularity after compound is levigate is less than 0.15mm.
Wherein the addition quality of pulvis is manganese ore 500kg, SiFe powder 57kg, carbon dust 200kg, pulverized limestone 100kg；Table 1 is
Different sample point ladle chemistries.
The purpose for measuring different sample point molten steel compositions is the molten steel composition and target component according to different phase, it is determined that
Different phase adds the quantity of mixed powder and corresponding dusting speed.The benefit dusted using apparatus of the present invention is increase
The contact area of pulvis and molten steel, promote response area between slag steel, improve Reduction of manganese ore 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：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%；Stone
Ash：CaO 82.78%, SiO2:3.11%, MgO 7.99%, Al2O31.19%, S 0.030%, P 0.006%；Manganese ore
Study point：TMn 42.8%, SiO216%, TFe 11.6%, P 0.13%, S 0.016%.Because silicomanganese, ferrosilicon, carbon dust and
There are some other impurity in lime, general composition total amount can not reach 100%.
At 1620 DEG C, jetting pressure 0.18-0.22Mpa, the flow that dusts is for the tapping temperature control of the present embodiment
100kg/min, injection time are 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%, cost-effective 3.0 yuan/ton of steel.
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 5, being built inside the involucrum 1 of ladle has ladle brick 2, it will be carried apart from 2 pieces of insertions that ladle bottom L is 800mm
The ladle brick of the steel pipe of air chamber respectively supplies as powder feeder unit inside ladle；The structure of 2 powder feeder units is identical, that is, supplies
One end of powder device with, by being connected for powder passage 3, pulvis, to being blown into inside ladle brick 2, is outside involucrum 1 outside involucrum 1
Powder is supplied inside ladle；It is noted that passing involucrum 1 by the space between involucrum 1 and ladle brick 2 for powder passage 3, and supply powder
The position that passage 3 passes involucrum 1 is located at the top of involucrum 1, and its position is higher than the upper surface of molten steel, to prevent letting out for molten steel
Leakage；
As shown in fig. 6, 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 reality
The blowing direction for applying 2 powder feeder units in example can be different, can be 15 ° with one, another is -15 °.
As shown in fig. 7, 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 cylinder-packing
In 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, to supply powder in ladle；
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, in Argon
Stand or LF processes, manganese mineral powder, light dolomite powder, pulverized limestone and the ferrosilicon for spraying into proper ratio into ladle with powder spraying pot form
Pulvis, the composition of pulvis is：Manganese ore 55.56%, light dolomite powder 14.77%, carbon dust 27.78%, ferrosilicon 7.41% are made
Into compound as pulvis, wherein add manganese ore 600kg, SiFe powder 80kg, carbon dust 300kg, light dolomite powder 100kg,
Manganese ore, light dolomite powder, the carbon dust respectively formed before combination is 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 |
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%；It is light-burned
Dolomite：CaO 45.0%, SiO2:2.15%, MgO 38%, burning subtract 14.2%, S 0.030%, P 0.03%；Manganese ore chemistry
Composition：TMn 42.8%, SiO216%, TFe 11.6%, P 0.13%, S 0.016%.
At 1620 DEG C, jetting pressure 0.18-0.22Mpa, the flow that dusts is for the tapping temperature control of the present embodiment
100kg/min, injection time are 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%, cost-effective 3.5 yuan/ton of steel.
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 figure 8, being built inside the involucrum 1 of ladle has ladle brick 2, it will be carried apart from 3 pieces of insertions that ladle bottom L is 800mm
The ladle brick of the steel pipe of air chamber respectively supplies as powder feeder unit inside ladle；The structure of 3 powder feeder units is identical, that is, supplies
One end of powder device with, by being connected for powder passage 3, pulvis, to being blown into inside ladle brick 2, is outside involucrum 1 outside involucrum 1
Powder is supplied inside ladle；It is noted that passing involucrum 1 by the space between involucrum 1 and ladle brick 2 for powder passage 3, and supply powder
The position that passage 3 passes involucrum 1 is located at the top of involucrum 1, and its position is higher than the upper surface of molten steel, to prevent letting out for molten steel
Leakage；
As shown in figure 9, the distance L of powder feeder unit and ladle bottom is 800mm, dust direction and the water of 3 powder feeder units
Square into -15 ° of angles, and 3 powder feeder units and ladle trunnion angle α are respectively 45 °, -45 ° and 135 °.
As shown in Figure 10, 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 surface of ladle brick
Concordantly, powder is supplied for ladle is interior；It is noted that bilayer sleeve includes inner and outer tubes, inner tube is located at the inside of outer tube, in inner tube
It is filled with refractory material filler, outward appearance a diameter of 22mm, diameter of inner pipe 10mm, the present embodiment selection bilayer sleeve.Using
The benefit of bilayer sleeve is if a line clogging, does not interfere with total injection effect.
The present embodiment adds silicomanganese 3080kg, ferrosilicon 600kg, carburant 20kg in converter tapping, after tapping, in Argon
Stand or LF processes, spray into the pulvis of the manganese mineral powder of proper ratio, carbon dust, pulverized limestone and ferrosilicon composition into ladle with powder spraying pot,
The composition of pulvis is：Manganese ore 52.25%, pulverized limestone 10.45%, carbon dust 31.35%, compound conduct made of ferrosilicon 5.96%
Pulvis, wherein adding manganese ore 500kg, SiFe powder 57kg, carbon dust 300kg, lime 100kg, the manganese ore respectively formed before combination, stone
Ashes, carbon dust are stocked up by drying, broken, levigate be used as.Particle diameter after levigate is less than 0.15mm (within 100 mesh), so
Ensure that pulvis is well mixed；Using ferrosilicon powder, it is necessary to dry, 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 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%；Stone
Ash：CaO 82.78%, SiO2:3.11%, MgO 7.99%, Al2O31.19%, S 0.030%, P 0.006%；Manganese ore
Study point：TMn 42.8%, SiO216%, TFe 11.6%, P 0.13%, S 0.016%.
At 1600 DEG C, jetting pressure 0.18-0.22Mpa, the flow that dusts is for the tapping temperature control of the present embodiment
100kg/min, injection time are 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%, cost-effective 3.0 yuan/ton of steel.
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 Fig. 2 being built inside the involucrum 1 of ladle has ladle brick 2, it will be carried apart from 1 piece of insertion that ladle bottom L is 800mm
The ladle brick of 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, powder
Agent outside involucrum 1 to being blown into inside ladle brick 2, to supply powder inside ladle；It is noted that for powder passage 3 by involucrum 1 with
Space between 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
Higher than the upper surface of molten steel, to prevent the leakage of molten steel；
As shown in figure 3, 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 11, the present embodiment powder feeder unit is made up of 1 piece of ladle brick, powder inlet, air chamber and 3 for tube cell, 3
It is embedded in for tube cell in ladle brick, and powder inlet and air chamber are not embedded into ladle brick, meanwhile, one end of powder inlet and air chamber
One end 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 for the another of tube cell
One end and the flush of ladle brick；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, at Argon station
Or LF processes, the pulvis formed with the manganese mineral powder of powder spraying pot penetrating proper ratio, light dolomite powder, carbon dust, ferrosilicon, pulvis
Form and be：Manganese ore 52.17%, light dolomite powder 8.70%, carbon dust 30.43%, compound conduct made of ferrosilicon 8.70%
Pulvis, wherein manganese ore 600kg, SiFe powder 100kg, carbon dust 350kg, light dolomite powder 100kg are added, it is each before combination to form
Manganese ore, light dolomite powder, carbon dust is by drying, broken, levigate as stock.
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 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%；Stone
Ash：CaO 82.78%, SiO2:3.11%, MgO 7.99%, Al2O31.19%, S 0.030%, P 0.006%；Manganese ore
Study point：TMn 42.8%, SiO216%, TFe 11.6%, P 0.13%, S 0.016%.
At 1590 DEG C, jetting pressure 0.18-0.22Mpa, the flow that dusts is for the tapping temperature control of the present embodiment
100kg/min, injection time are 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%, cost-effective 3.5 yuan/ton of steel.
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])iFor
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])iFor
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, gold
The recovery rate for belonging to magnesium 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, %.
In summary, the invention provides a kind of method that molten steel manganeisen addition is reduced in refining process, with biography
The method added by top of system is compared, and the method for side-blown spray of the invention has that impeller in slurry pump speed is fast, the reaction time
It is short, desulfurization and remove steel inclusion effect it is good the advantages of.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should all be included within the scope of the present invention.
Claims (10)
1. the method for molten steel manganeisen addition is reduced in a kind of refining process, it is characterised in that comprise the following steps：
Step 1, in converter tapping process, deoxidation and partially-alloyed is carried out to molten steel；
Step 2, enter the station at Argon station or LF, pulvis is sprayed into ladle and carries out manganese ore alloying processing.
2. reducing the method for molten steel manganeisen addition in a kind of refining process according to claim 1, its feature exists
In, in the step 1, added in converter tapping silicomanganese, ferrosilicon and carburant to molten steel carry out partially-alloyed, the silicomanganese
Addition scope be 0~100kg/t steel；The addition scope of the ferrosilicon is 0~100kg/t steel；The carburant adds
Dosage scope is 0~90kg/t steel.
3. reducing the method for molten steel manganeisen addition in a kind of refining process according to claim 1, its feature exists
In in the step 2, the pulvis is the mixture of manganese mineral powder, pulverized limestone and carbonaceous material, the addition model of the mixture
It is 1~50kg/t steel to enclose.
4. reducing the method for molten steel manganeisen addition in a kind of refining process according to claim 3, its feature exists
In in the mixture, by mass percentage, the addition of the manganese mineral powder is 40%~85%, the carbonaceous material
Addition is 10%~40%, and the addition of the pulverized limestone is 0.1%~20%；The mass fraction sum of above-mentioned each component is
100%.
5. reducing the method for molten steel manganeisen addition in a kind of refining process according to claim 1, its feature exists
In in the step 2, the pulvis is the mixture of manganese mineral powder, light dolomite powder and carbonaceous material, and the mixture adds
It is 1~50kg/t steel to enter amount scope.
6. reducing the method for molten steel manganeisen addition in a kind of refining process according to claim 5, its feature exists
In in the mixture, by mass percentage, the addition of the manganese mineral powder is 40%~85%, the carbonaceous material
Addition is 10%~40%, and the addition of the light dolomite powder is 0.1%~20%；The mass fraction of above-mentioned each component
Sum is 100%.
7. reducing the method for molten steel manganeisen addition in a kind of refining process according to claim 1, its feature exists
In in the step 2, the pulvis is needed before penetrating by drying, crushing, milling processing, the granularity of the pulvis after milling
Less than 0.15mm.
8. reducing the method for molten steel manganeisen addition in a kind of refining process according to claim 1, its feature exists
In in the step 2, the pulvis is sprayed into the side of the ladle by the element that dusts, the pressure model that the pulvis sprays into
Contain and make in 0.05Mpa~0.55Mpa, the injection time control of the pulvis is in 1min~15min, the flow model of the pulvis
System is contained in 1kg/min~200kg/min；When spraying into pulvis, the argon bottom-blowing strength control of the ladle is existed
0.003Nm3/ t.min~0.008Nm3/t.min。
9. reducing the method for molten steel manganeisen addition in a kind of refining process according to claim 8, its feature exists
In the element that dusts has N number of, N >=1；N number of element that dusts partly or entirely is embedded in N number of ladle brick；N number of spray
One end of powder element communicates with inside the ladle, is ladle side blowing powder, N number of element that dusts it is another
By being connected for powder passage with outside powder feeder unit, the height of the outside powder feeder unit arrival end is higher than steel in the ladle at end
The height of liquid.
10. reducing the method for molten steel manganeisen addition in a kind of refining process according to claim 8, its feature exists
In, the element that dusts be arranged in the distance of the ladle bottom account for the percentage of the ladle total height for 20%~
50%.
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