CN109385505A - A kind of method that vacuum control obtains reproducibility high alkalinity white slag in VD furnace - Google Patents
A kind of method that vacuum control obtains reproducibility high alkalinity white slag in VD furnace Download PDFInfo
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- CN109385505A CN109385505A CN201811119709.8A CN201811119709A CN109385505A CN 109385505 A CN109385505 A CN 109385505A CN 201811119709 A CN201811119709 A CN 201811119709A CN 109385505 A CN109385505 A CN 109385505A
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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
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- C21C7/10—Handling in a vacuum
Abstract
The invention belongs to external refining white slag technical field of smelting, and in particular to a kind of method that vacuum control obtains reproducibility high alkalinity white slag in VD furnace.The method is to be restored the acidic oxide in ladle slag by slag fierce in vacuum/steel reaction using the carbon in molten steel, under VD furnace vacuum condition so that high oxidative ladle slag is changed into reproducibility high alkalinity white slag.Method of the invention is not adding lime, Al, metal, SiC, CaC2Under the premise of slag material and steel ladle slag reducing agent, it is vacuum-treated using VD and high oxidative ladle slag is changed into high alkalinity reproducibility white slag, this method has many advantages, such as the consumption of less slag material, shortens into the white slag time, reduces the deoxidier consumption of final deoxygenation of molten steel and improve molten steel cleanness, be focus on molten steel external refining process make white slag technique, it is the desulfurization of molten steel external refining processing efficient, effective dross inclusion adsorption, the important prerequisite for reducing molten steel secondary oxidation that ladle slag, which makes white slag,.
Description
Technical field
The invention belongs to external refining white slag technical field of smelting, and in particular to vacuum control is restored in a kind of VD furnace
The method of property high alkalinity white slag.
Background technique
Steelmaking process is generally divided into three phases: the first refining stage of steel, the external refining stage of steel, molten steel casting solidification
Stage.Just the refining stage is mainly the sponge iron produced using the molten iron of blast fumance or direct reduction iron making or steel scrap as raw material,
Iron material is smelted into crude steel with different method for making steel (converter, open hearth, electric furnace), wherein converter and electric furnace are main just refinings
Furnace apparatus.The external refining stage of steel be the molten steel for producing first furnace be transferred in another reaction vessel it is carried out it is secondary
The process of refining (including: the refining of LF furnace, the refining of VD furnace, RH refining, CAS refining etc.), according to the purity requirements of target steel grade
First steel-making liquid is de-gassed, deoxidation, desulfurization, the metallurgical task such as removal of inclusions and trimming；The metallurgy of double refining is appointed
It is engaged in main by the realization of the technological means such as slag making, air blowing, vacuum, heating, alloying, final acquisition ingredient and temperature are reasonable, have
Evil constituent content is low, meets the qualified molten steel of steel grade requirement；The casting solidification stage of molten steel will meet steel grade performance requirement
Qualified molten steel pours into the continuous casting billet or ingot casting of certain specification by way of continuous casting or molding.
Tradition make white slag technique mainly by heat and make in LF furnace refining process reducing slag completion, using Al,
SiC、CaC2Equal reducing agents by acidic oxide (the FeO, MnO) reduction in ladle in high oxidative clinker be reduced to 2.0% with
Under, and lime adjustment ladle basicity of slag acquisition reproducibility high alkalinity white slag is added into ladle slag simultaneously, but the realization white slag
Process there are the slag making period, long, slag material (lime, deoxidier) consumes more, electrode and power consumption is big, the skills such as at high cost
Art problem.Therefore, technique reduction slag making consumption and cost that white slag is made in external refining how are improved, realizes that quick white slag is smelted
It is the difficult point of one urgent need to resolve in this field.
Summary of the invention
To solve the above problems, the present invention proposes that vacuum control obtains the side of reproducibility high alkalinity white slag in a kind of VD furnace
Method.The method is not adding lime, Al, metal, SiC, CaC2Under the premise of slag material and steel ladle slag reducing agent, VD is utilized
It is vacuum-treated and high oxidative ladle slag is changed into high alkalinity reproducibility white slag, this method has the consumption of less slag material, contracting
It is short at the white slag time, reduce final deoxygenation of molten steel deoxidier consumption and improve molten steel cleanness the advantages that.Side of the present invention
Method be focus on molten steel external refining process make white slag technique, it is that molten steel external refining processing efficient is de- that ladle slag, which makes white slag,
Sulphur, effective dross inclusion adsorption, the important prerequisite for reducing molten steel secondary oxidation.
The present invention is achieved by the following technical solutions:
A kind of method that vacuum control obtains reproducibility high alkalinity white slag in VD furnace, the method is in VD furnace vacuum condition
Under, it is reacted using carbon by slag fierce in vacuum/steel and is gone back the acidic oxide (FeO, MnO) in ladle slag
Original, so that high oxidative ladle slag is changed into reproducibility high alkalinity white slag.
Further, acidic oxide (FeO, MnO) obtains in the carbon reduction ladle slag in the method control molten steel
Pollution-free removing is carried out to residual oxygen in molten steel while obtaining reproducibility high alkalinity white slag, molten steel can be reduced in subsequent final deoxidizing
Deoxidier Al and CaC in the process2Consumption, reduce deoxidation products Al2O3Field trash generate, and and the method reduction
Product is gas CO, and product does not pollute molten steel, improves molten steel cleanness.
Further, the method comprises the steps of:
Step 1, first furnace tapping control
Using half calm tapping, (that is: the deoxygenated alloy that is added into molten steel of tapping process is in shortage, steel when first furnace tapping
The incomplete deoxidation of liquid), retain in molten steel and be partly dissolved oxygen, while keeping the oxidisability of ladle slag；
Step 2, VD furnace is vacuum-treated
Under VD furnace vacuum environment, carbon dust is added in the top of the slag of Xiang Suoshu ladle slag, makes institute using steel ladle bottom argon blowing gas agitating
It states that the carbon in molten steel, carbon dust is reacted with the oxygen in the molten steel and the acidic oxide in ladle slag on the top of the slag, goes back raw steel
Acidic oxide in cinder inclusion simultaneously removes part residual oxygen in molten steel, finally obtains the reproducibility high alkalinity white slag.
Further, it is acid in carbon content and ladle slag in molten steel when the addition of carbon dust is tapped using first furnace in step 2
Relational model in oxide content and molten steel between free oxygen content determines, shown in the relational model such as following formula (1)；It is described
The determination method of relational model is: when the formula (1) establishment, then it is de- to the control of ladle slag reproducibility and auxiliary molten steel to reach carbon
The requirement of oxygen, at this time it is not necessary that carbon dust is added；When the formula (1) is invalid, carbon dust need to be added to supplement the carbon in the molten steel
Content, until the formula (1) is set up:
Wsteel·w[C]/100≥1.2×(Wsteel·[O]Free·10-6+Wslag·16/72w(FeO)/100+Wslag·
16/71w (MnO)/100) --- ----formula (1)；
Wherein, WsteelFor molten steel weight, kg；WslagFor ladle slag weight, kg；W (FeO) is iron oxide content in slag, %；
W (MnO) is MnO content in ladle slag, %；[O]FreeFor the activity value of oxygen free in molten steel；W [C] is that carbon contains in molten steel
Amount, %；16/72 is the ratio between the molal weight of oxygen and molal weight of iron oxide；16/71 is the molal weight and manganese oxide of oxygen
The ratio between molal weight.
Further, determined using the relational model, be by the ingredient and steel slag of sampling steel before the VD furnace vacuum
The ingredient and slag thickness data of sampling input in the relational model.
Further, carbon dust described in step 2 is added when vacuum degree is 2.5KPa-1.0KPa, is added in too early molten steel
Carbon does not have abundant fully reacting, and the carbon dust after addition will reduce the recovery rate of metal；It is added and will affect ladle slag too late
Recovery time, while the drag force increase that carbon dust is subject to, which is added, under condition of high vacuum degree causes addition difficult, the recovery rate of metal also can
It reduces.
Further, the method can make molten steel deoxidier Al and CaC during subsequent final deoxidizing2The reduction of consumption
It is to be consumed in molten steel since [C]+[O]=CO (g) occurs under vacuum conditions for carbon in molten steel and portion of residual oxygen element
Portion of residual oxygen element；Deoxidation products Al2O3The reduction amount of field trash is indicated by following formula (2), is disappeared with carbon in molten steel
Residual oxygen is related in the molten steel of consumption:
ΔmAl2O3=2.125 × Δ [O]Free·10-6·Wsteel--- --- -- formula (2)
Wherein, Δ m in formula (2)Al2O3For deoxidation products Al2O3The reduction amount of field trash, kg；Δ[O]FreeFor in molten steel
The activity value of free oxygen changes；WsteelFor the weight of molten steel in ladle, kg；2.125 being Al2O3Molecular weight and Al2O3Middle oxygen rubs
That mass ratio.
Further, the activity value of free oxygen changes (Δ [O] in the molten steelFree) it is before VD is vacuum-treated and at vacuum
After reason in molten steel free oxygen activity difference, directly measured in molten steel using Determining oxygen probe；Oxygen content disappears in the molten steel
Free oxygen in molten steel after consumption is vacuum-treated by free oxygen content in the molten steel before being vacuum-treated by measurement VD and VD
The difference of content determines.
Further, the acidic oxide includes FeO and MnO.
Further, described in step 1 when just furnace tapping, carbon content control in the molten steel at [C] >=0.10%,
Control for Oxygen Content is in 100ppm≤[O]≤400ppm in the molten steel；Temperature is controlled at T=1660-1690 DEG C；Carbon in first furnace
Content [C] < 0.10% will lead in molten steel for restoring the scarce capacity of oxide in slag；Oxygen content is higher than in the molten steel
400ppm will lead to carbon in molten steel and mainly react with oxygen in molten steel and the reduction of the reacting dose of slag, the formation effect of weakening ladle white slag
Fruit；Tapping temperature can ensure the just reasonable carbon oxygen product of furnace terminal at T=1660-1690 DEG C, be conducive to the shape of subsequent white slag
At and control.
Further, the molten steel oxygen measured when just furnace tapping according to first furnace terminal Determining oxygen probe described in step 1
Content determines and Control for Oxygen Content range adds deoxidier into the molten steel, but without added into ladle slag lime,
Al, metal, SiC, CaC2Slag material and steel ladle slag reducing agent keep the oxidisability of the dissolved oxygen and slag in molten steel.
Further, in the vacuum environment of VD furnace described in step 2 vacuum pressure with vacuum pump starting step by step (5 grades pump -- 4
1 grade of pump of grade pump -- 3 grades pump -- 2 grades pump --), 33KPa (5 grades of pumps), (4 grades of 8KPa are successively reduced to by atmospheric pressure in VD furnace
Pump), 2.5KPa (3 grades pump), 500Pa (2 grades of pumps), vacuum pressure maintains the Gao Zhen of final vacuum pressure after 1 grade of pump startup
Reciprocal of duty cycle state.
Further, 5 grades of pump work durations are about 2-3min；
4 grades of pump work durations are about 2-3min；
3 grades of pump work durations are about 2-3min；
2 grades of pump work durations are about 2-3min；
1 grade of pump work duration is about 2-3min.
Further, the reaction equation that carbon restores in step 2 has:
Iron oxide is reacted with carbon: FeO+C=Fe+CO (g)；
Manganese oxide is reacted with carbon: MnO+C=Mn+CO (g).
Further, it is 150-300Pa that the final vacuum pressure in the vacuum environment of VD furnace described in step 2, which maintains range,.
Further, retention time range is in final vacuum pressure range in VD furnace vacuum environment described in step 2
15min-25min。
Further, the carbon in molten steel described in the vacuum environment of VD furnace described in step 2 (including in vacuum process plus
The carbon when carbon dust entered and first furnace are tapped in molten steel) it is reacted with the oxygen in the molten steel, while restoring acid oxygen in ladle slag
Compound.
Further, the component and mass percent of the ladle slag are as follows: CaO:35-50%, SiO2: 5-15%, MgO:
8-12%, MnO:1%-3%, FeO:10-20%, P2O5≤ 2%, Al2O3: 10-15%.
The present invention has following advantageous effects:
The method that vacuum control obtains reproducibility high alkalinity white slag in a kind of VD furnace of the invention, the method utilize molten steel
In carbon reacted under VD furnace vacuum condition with the oxygen in molten steel and the acidic oxide in ladle slag so that ladle
Acidic oxide in slag is reduced, to obtain reproducibility high alkalinity white slag, has both reduced the consumption of ladle top slag slag material,
The usage amount of subsequent steel liquid deoxidizing agent is reduced again.
Detailed description of the invention
Fig. 1 is that vacuum control obtains the method flow diagram of reproducibility high alkalinity white slag in a kind of VD furnace of the embodiment of the present invention.
Fig. 2 is that influence of the VD furnace vacuum chamber pressure to FeO content and MnO content in ladle slag is illustrated in the embodiment of the present invention
Figure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments and specification
The present invention is explained in further detail in attached drawing.It should be appreciated that specific embodiment described herein is used only for explaining this
Invention, is not intended to limit the present invention.
On the contrary, the present invention covers any substitution done on the essence and scope of the present invention being defined by the claims, repairs
Change, equivalent method and scheme.Further, in order to make the public have a better understanding the present invention, below to of the invention thin
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
The present invention can also be understood completely in description.
Embodiment 1
The present embodiment is related to a kind of method that vacuum control obtains reproducibility high alkalinity white slag in VD furnace, and the method includes
Following steps:
Step 1, first furnace tapping control
Using half calm tapping, (that is: the deoxygenated alloy that is added into molten steel of tapping process is in shortage, steel when first furnace tapping
The incomplete deoxidation of liquid), retain in molten steel and be partly dissolved oxygen, while keeping the oxidisability of ladle slag；
Step 2, VD furnace is vacuum-treated
Under VD furnace vacuum environment, carbon dust is added in the top of the slag of Xiang Suoshu ladle slag, makes institute using steel ladle bottom argon blowing gas agitating
It states that the carbon in molten steel, carbon dust is reacted with the oxygen in the molten steel and the acidic oxide in ladle slag on the top of the slag, goes back raw steel
Acidic oxide in cinder inclusion simultaneously removes part residual oxygen in molten steel, finally obtains the reproducibility high alkalinity white slag.
The method controls acidic oxide (FeO, MnO) in the carbon reduction ladle slag in molten steel and obtains reproducibility height
Pollution-free removing is carried out to residual oxygen in molten steel while basicity white slag, molten steel deoxidation during subsequent final deoxidizing can be reduced
Agent Al and CaC2Consumption, reduce deoxidation products Al2O3Field trash generates, and and the reduzate of the method be gas
CO, product do not pollute molten steel, improve molten steel cleanness.
The addition of carbon dust is using acidic oxide content in carbon content in molten steel when the tapping of first furnace and ladle slag in step 2
And the relational model in molten steel between free oxygen content determines, shown in the relational model such as following formula (1)；The relational model
Determination method is: when the formula (1) establishment, then reach requirement of the carbon to the control of ladle slag reproducibility and auxiliary deoxygenation of liquid steel,
At this time it is not necessary that carbon dust is added；When the formula (1) is invalid, carbon dust need to be added to supplement the carbon content in the molten steel, until
The formula (1) is set up:
Wsteel·w[C]/100≥1.2×(Wsteel·[O]Free·10-6+Wslag·16/72w(FeO)/100+Wslag·
16/71w (MnO)/100) --- ----formula (1)；
Wherein, WsteelFor molten steel weight, kg；WslagFor ladle slag weight, kg；W (FeO) is iron oxide content in slag, %；
W (MnO) is MnO content in ladle slag, %；[O]FreeFor the activity value of oxygen free in molten steel；W [C] is that carbon contains in molten steel
Amount, %；16/72 is the ratio between the molal weight of oxygen and molal weight of iron oxide；16/71 is the molal weight and manganese oxide of oxygen
The ratio between molal weight.
Carbon dust described in step 2 is added when vacuum degree is 2.5KPa-1.0KPa, and carbon in too early molten steel, which is added, not to be had
Abundant fully reacting, the carbon dust after addition will reduce the recovery rate of metal；The recovery time that will affect ladle slag too late is added, together
When the drag force increase that carbon dust is subject to be added under condition of high vacuum degree cause to be added difficult, the recovery rate of metal can also reduce.
The method can make molten steel deoxidier Al and CaC during subsequent final deoxidizing2The reduction of consumption is due to steel
[C]+[O]=CO (g) occurs under vacuum conditions for carbon and portion of residual oxygen element in liquid, consumes portion of residual in molten steel
Oxygen element；Deoxidation products Al2O3The reduction amount of field trash is indicated by following formula (2), with molten steel consumed by carbon in molten steel
Middle residual oxygen is related:
ΔmAl2O3=2.125 × Δ [O]Free·10-6·Wsteel--- --- -- formula (2)
Wherein, Δ m in formula (2)Al2O3For deoxidation products Al2O3The reduction amount of field trash, kg；Δ[O]FreeFor in molten steel
The activity value of oxygen content changes；WsteelFor the weight of molten steel in ladle, kg；2.125 being Al2O3Molecular weight and Al2O3Middle oxygen rubs
That mass ratio.
Consumption (the Δ [O] of oxygen content in the molten steelFree) be before VD is vacuum-treated be vacuum-treated after in molten steel from
By the difference of oxygen, directly measured in molten steel using Determining oxygen probe；The consumption of oxygen content is by passing through measurement VD in the molten steel
The difference of free oxygen content determines in molten steel after free oxygen content and VD are vacuum-treated in the molten steel before being vacuum-treated.
The acidic oxide includes FeO and MnO.
Described in step 1 when just furnace tapping, the carbon content control in the molten steel is in [C] >=0.10%, the molten steel
Middle Control for Oxygen Content is in 100ppm≤[O]≤400ppm；Temperature is controlled at T=1660-1690 DEG C；Carbon content [C] in first furnace <
0.10% will lead in molten steel for restoring the scarce capacity of oxide in slag；Oxygen content is higher than 400ppm meeting in the molten steel
Carbon in molten steel is caused mainly to react with oxygen in molten steel and the reduction of the reacting dose of slag, the formation effect of weakening ladle white slag；Tapping
Temperature can ensure the just reasonable carbon oxygen product of furnace terminal at T=1660-1690 DEG C, be conducive to the formation and control of subsequent white slag
System.
It is determined when just furnace tapping according to the molten steel oxygen content that first furnace terminal Determining oxygen probe is measured described in step 1
And Control for Oxygen Content range adds deoxidier into the molten steel, but without added into ladle slag lime, Al, metal,
SiC、CaC2Slag material and steel ladle slag reducing agent keep the oxidisability of the dissolved oxygen and slag in molten steel.
In the vacuum environment of VD furnace described in step 2 vacuum pressure with vacuum pump (5 grades of 3 grades of the pumps -- 4 grades pump -- of starting step by step
1 grade of pump of pump -- 2 grades pump --), 33KPa (5 grades of pumps), 8KPa (4 grades of pumps), 2.5KPa (3 are successively reduced to by atmospheric pressure in VD furnace
Grade pump), 500Pa (2 grades pump), vacuum pressure maintains the high vacuum conditions of final vacuum pressure after 1 grade of pump startup.
It is 150-300Pa that final vacuum pressure in the vacuum environment of VD furnace described in step 2, which maintains range,.
Retention time range is 15min-25min in final vacuum pressure range in VD furnace vacuum environment described in step 2.
Carbon in molten steel described in the vacuum environment of VD furnace described in step 2 is (including the carbon dust being added in vacuum process
With the carbon in molten steel when the tapping of first furnace) it is reacted with the oxygen in the molten steel, while restoring acidic oxide in ladle slag.
The present embodiment according to the method that vacuum control obtains reproducibility high alkalinity white slag in a kind of VD furnace set forth above,
60 tons of converter smelting 20Mn2 steel, raw material use low-phosphorous molten iron and low-phosphorous steel scrap.
The qualified molten steel (ingredient is as shown in table 1 below) and partial oxidative clinker that converter smelting obtains enter after tapping
In ladle, 1690 DEG C of tapping temperature, tap 62t, ladle slag thickness 100mm (slag ingredient is as shown in table 2 below) after tapping,
Ladle is transported the station VD to be vacuum-treated.
Molten steel component/wt% after 1 converter tapping of table
Ladle slag ingredient/wt% after table 2 is tapped
Vacuum process is as follows:
After ladle immersion VD vacuum tank is in place, argon gas valve is opened, flow is adjusted to liquid level and is slightly wriggled, vacuum tank is covered
Lid, starts to be vacuum-treated；Starting Pyatyi vacuum pump first starts to vacuumize, and when vacuum degree drops to 33KPa, starts 4 grades very
Sky pump；When vacuum degree drops to 8kPa, start 3 grades of vacuum pumps；When vacuum degree is further lowered into 2.5kPa, start 2 grades
Vacuum pump；Start 1 grade of vacuum pump when vacuum degree reaches 500pa, reaches 200Pa in vacuum degree hereinafter, keeping 20min.Vacuum
FeO and MnO content is reduced to 1.65% and 0.46%, slag by entering 10% and 2.5% before vacuum respectively in slag after reaction
Middle iron and manganese element largely enter in molten steel, at this point, reproducibility high alkalinity white slag is made in ladle slag.
Claims (10)
1. a kind of method that vacuum control obtains reproducibility high alkalinity white slag in VD furnace, which is characterized in that the method is in VD
Under furnace vacuum condition, the acidic oxide in ladle slag is gone back by slag fierce in vacuum/steel reaction using carbon
Original, so that high oxidative ladle slag is changed into reproducibility high alkalinity white slag.
2. the method that vacuum control obtains reproducibility high alkalinity white slag in a kind of VD furnace according to claim 1, feature
It is, the method comprises the steps of:
Step 1, first furnace tapping control
Using half calm tapping when first furnace tapping, retains in molten steel and be partly dissolved oxygen, while keeping the oxidisability of ladle slag；
Step 2, VD furnace is vacuum-treated
Under VD furnace vacuum environment, carbon dust is added in the top of the slag of Xiang Suoshu ladle slag, makes the steel using steel ladle bottom argon blowing gas agitating
Carbon dust is reacted with the oxygen in the molten steel and the acidic oxide in ladle slag on carbon, the top of the slag in liquid, restores ladle slag
In acidic oxide and remove part residual oxygen in molten steel, finally obtain the reproducibility high alkalinity white slag.
3. the method that vacuum control obtains reproducibility high alkalinity white slag in a kind of VD furnace according to claim 2, feature
Be, when the addition of carbon dust is tapped using first furnace in step 2 in molten steel in carbon content and ladle slag acidic oxide content and
Relational model in molten steel between free oxygen content determines, shown in the relational model such as following formula (1)；The relational model is sentenced
The method of determining is: when the formula (1) establishment, then reach requirement of the carbon to the control of ladle slag reproducibility and auxiliary deoxygenation of liquid steel, this
Carbon dust is added in Shi Wuxu；When the formula (1) is invalid, carbon dust need to be added to supplement the carbon content in the molten steel, until institute
State formula (1) establishment:
Wsteel·w[C]/100≥1.2×(Wsteel·[O]Free·10-6+Wslag·16/72w(FeO)/100+Wslag·16/
71w (MnO)/100) --- ----formula (1)；
Wherein, WsteelFor molten steel weight, kg；WslagFor ladle slag weight, kg；W (FeO) is iron oxide content in slag, %；w
It (MnO) is MnO content in ladle slag, %；[O]FreeFor the activity value of oxygen free in molten steel；W [C] is carbon content in molten steel, %；
16/72 is the ratio between the molal weight of oxygen and molal weight of iron oxide；16/71 is the molal weight of oxygen and mole matter of manganese oxide
The ratio between amount.
4. the method that vacuum control obtains reproducibility high alkalinity white slag in a kind of VD furnace according to claim 2, feature
It is, carbon dust described in step 2 is added when vacuum degree is 2.5KPa-1.0KPa.
5. the method that vacuum control obtains reproducibility high alkalinity white slag in a kind of VD furnace according to claim 2, feature
It is, the acidic oxide includes FeO and MnO.
6. the method that vacuum control obtains reproducibility high alkalinity white slag in a kind of VD furnace according to claim 2, feature
It is, described in step 1 when just furnace tapping, carbon content control in the molten steel oxygen in [C] >=0.10%, the molten steel
Content is controlled in 100ppm≤[O]≤400ppm；Temperature is controlled at T=1660-1690 DEG C.
7. the method that vacuum control obtains reproducibility high alkalinity white slag in a kind of VD furnace according to claim 2, feature
Be, described in step 1 just furnace tapping when determined according to the molten steel oxygen content that first furnace terminal Determining oxygen probe is measured and
Control for Oxygen Content range adds deoxidier into the molten steel, but without added into ladle slag lime, Al, metal, SiC,
CaC2Slag material and steel ladle slag reducing agent keep the oxidisability of the dissolved oxygen and slag in molten steel.
8. the method that vacuum control obtains reproducibility high alkalinity white slag in a kind of VD furnace according to claim 2, feature
Be, in the vacuum environment of VD furnace described in step 2 vacuum pressure with vacuum pump starting step by step: 5 grades of 3 grades of pumps -- 4 grades pump --
Pump -- 2 grades of pumps -- 1 grade of pump；33KPa, 8KPa, 2.5KPa, 500Pa are successively reduced to by atmospheric pressure in the VD furnace, when 1 grade
Vacuum pressure maintains the high vacuum conditions of final vacuum pressure after pump startup.
9. the method that vacuum control obtains reproducibility high alkalinity white slag in a kind of VD furnace according to claim 2, feature
It is, it is 150-300Pa that the final vacuum pressure in the vacuum environment of VD furnace described in step 2, which maintains range,；
Retention time range is 15min-25min in final vacuum pressure range in VD furnace vacuum environment described in step 2.
10. the method that vacuum control obtains reproducibility high alkalinity white slag in a kind of VD furnace according to claim 2, feature
It is, the component and mass percent of the ladle slag are as follows: CaO:35-50%, SiO2: 5-15%, MgO:8-12%, MnO:
1%-3%, FeO:10-20%, P2O5≤ 2%, Al2O3: 10-15%.
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