CN103624246B - A kind of continuous casting high-aluminum steel stuffing sand and using method thereof - Google Patents
A kind of continuous casting high-aluminum steel stuffing sand and using method thereof Download PDFInfo
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- CN103624246B CN103624246B CN201210289027.8A CN201210289027A CN103624246B CN 103624246 B CN103624246 B CN 103624246B CN 201210289027 A CN201210289027 A CN 201210289027A CN 103624246 B CN103624246 B CN 103624246B
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Abstract
The invention discloses a kind of continuous casting high-aluminum steel stuffing sand, comprise by mass percentage as frame material 29～37% quartz sand, 52～60% chrome ore as base material, 9～12% carbon dust as additive, 0.5～2% phenolic resin as binding agent, and phase mix homogeneously form.The invention also discloses the using method of a kind of continuous casting high-aluminum steel stuffing sand, for stuffing sand first carries out toasting pretreatment, then stuffing sand is added to the mouth of a river, and beyond pocket block plane 5～15mm.Use the present invention can be effectively improved ladle self-opening rate, propose effective and convenient operation, reduce labor intensity, pollution-free, meet technological requirement, stuffing sand can be made to flow out with molten steel smoothly during putting sand, reduce field trash in steel ingot.
Description
Technical field
The present invention relates to stuffing sand, more particularly, it relates to a kind of continuous casting high-aluminum steel stuffing sand and
Using method.
Background technology
The ladle carrying molten steel in steelmaking operations drains molten steel by the slide gate nozzle of bottom.At molten steel
Before being introduced into ladle, it is necessary to pour into the refractory material of powdery in slide gate nozzle, its purpose is to keep away
Exempt from directly contacting of high-temperature molten steel and the mouth of a river, it is to avoid the melting loss of slide gate nozzle and cause production accident.
Traditional stuffing sand, easily forms the thickest sinter layer blocking slide gate nozzle under the effect of molten steel,
Molten steel is because such blocking can not normally be flowed out in slide gate nozzle.Operator sometimes has to make
The material of blocking is cut open by the method for oxygen machining.This is extremely hazardous work, and therefore implant is blocked up
The incidence rate of plug slide gate nozzle should be lowered as much as possible, and optimum situation is that this probability is close to 0%.
In the workshop based on continuous casting, the blocking of slide gate nozzle will cause the fiber crops in many operations
Tired.In some cases, molten steel first passes around and refines dephosphorization at the beginning of electric furnace, then through the long period in ladle
Refinement and deoxidation, desulfurization.Indivedual complicated steel grades may be up in the process time of stove outer (in ladle)
8 hours (generally individually at more than 200min), under working condition the most badly, we are still
Wish that slide gate nozzle implant does not occur the situation of blocking.
Domestic and international each big steel company steel mill high-aluminum steel self-opening rate situation, general high-aluminum steel is by the steel time
Within 80min, self-opening rate is typically maintained between 84～89%；By the steel time 120～180min
Within, self-opening rate maintains essentially between 70～85%, if but by the steel time significantly more than 200min,
Self-opening rate is all far below 50%, and therefore high-aluminum steel self-opening rate situation perplexs many production units always.Mesh
Before, produce large batch of high-aluminum steel (such as: 20M n23AIV), its self-opening rate always not less than 50%,
Average out to 29.51%, why self-opening rate is the lowest for it, contrasts all kinds of different factor, smelts this at present
Class high-aluminum steel, and when being higher than 200min by the steel time, the main cause that ladle self-opening rate is low has as follows
Some:
1, steel grade characteristic, containing a large amount of aluminum.Its amount containing Al is between 1.6～2.45%, hence it is evident that higher than it
His steel grade, other steel grades measure generally individually≤0.02% containing Al, and this steel grade amount containing Al is the most common
100 times of steel grade.And due to element al and O2Affinity the biggest, it is easy to react also with oxygen
Be combined with other compounds, produce many floccules, be attached on mouth of a river periphery, affect the quality of molten steel
With normal cast；
2, this steel grade is by steel time overlength, is averagely all higher than 200min, the most greatly by the steel time at present
In similar steel mill by the steel time, cause high-temperature molten steel and stuffing sand because of Long contact time, and produce burning
Knot layer is blocked up, causes ladle normally certainly can not open or pour into a mould；
3, being leptosomic type due to ladle, bag flow field is not very uniform, the most single air brick
Time, owing to bottom bubble is in uphill process, it is impossible to large-area be distributed in molten bath, but skew
State, i.e. argon mixing effect is uneven, and molten steel is not effectively form closed circuit, causes the mouth of a river
Near there is dead band, temperature is on the low side, finally because of in ladle temperature uneven and cause the ladle nozzle can not be just
Chang Zikai；
4, current each Large Steel factory owner to use siliceous stuffing sand, zirconium matter stuffing sand and high chromium matter to draw
Quicksand, the highest chromium matter stuffing sand application surface is the widest, its Cr2O3Content is up to more than 40%, mainly
It is to prevent sinter layer blocked up, also can have effective volumetric expansion, and its proportion is the biggest, but
It is used alone chromium sand, the blocking at the mouth of a river can be caused mutually, therefore often at chrome ore because it is easily formed sintering
On the basis of allocate appropriate quartz sand, carbon dust, binding agent etc. into, can effectively improve ladle self-opening rate.
According to present circumstances apparently, general steel grade is had preferably from opening effect by high chromium matter stuffing sand,
But for the steel grade containing high alumina, and by steel time the longest steel grade, still there is inadaptability, no
Ladle self-opening rate can be effectively improved.
Summary of the invention
For disadvantages mentioned above present in prior art, it is an object of the invention to provide a kind of continuous casting high alumina
Steel stuffing sand and using method thereof, it is possible to avoid occurring ladle invar liquid stream certainly not open and cause all kinds of folder
Foreign material enter in molten steel, produce many production accidents and quality problems.
For achieving the above object, the present invention adopts the following technical scheme that
On the one hand, a kind of continuous casting high-aluminum steel stuffing sand, comprise by mass percentage as frame material
29～37% quartz sand, 52～60% chrome ore as base material, 9～12% carbon dust as additive,
As 0.5～2% phenolic resin of binding agent, and phase mix homogeneously forms.
Described quartz sand contains SiO2>=99wt%, and particle diameter is between 0.15～1.0mm.
Described chrome ore is containing Cr2O3>=50wt%, and particle diameter is between 0.15mm～0.8mm.
Described carbon dust is containing C >=95wt%, and particle diameter is 0.15～1.0mm.
Described stuffing sand is full particle, particle diameter 0.15～1.0mm ＞ 90%, each beyond bound
≯ 5%, and the free moisture of stuffing sand is not more than 0.4%.
On the other hand, the using method of a kind of continuous casting high-aluminum steel stuffing sand, it is characterised in that:
A., toasting in stuffing sand is placed in drying room, baking temperature is 40～60 DEG C, baking time
For >=24 hours；
B. prepare first about 1 hour of tapping at high-aluminum steel, begin preparing for double argon air brick ladle, the most clear
Foreign body and air brick top cold steel residue in reason clean water ports, then uses and adds sandpipe by stuffing sand introducing
To the mouth of a river, stuffing sand addition controls at stuffing sand upper surface beyond pocket block plane 5～15mm.
In technique scheme, the continuous casting high-aluminum steel stuffing sand of the present invention, wraps by mass percentage
Containing 29～37% quartz sand as frame material, 52～60% chrome ore as base material, as adding
9～12% carbon dust of agent, 0.5～2% phenolic resin as binding agent, and phase mix homogeneously form.
Stuffing sand, for first carrying out stuffing sand toasting pretreatment, is then added by the stuffing sand using method of the present invention
Enter to the mouth of a river, and beyond pocket block plane 5～15mm.Use the present invention can be effectively improved steel
Bag self-opening rate, proposes effective and convenient operation, reduces labor intensity, pollution-free, meets technological requirement,
Stuffing sand can be made to flow out with molten steel smoothly during putting sand, reduce field trash in steel ingot.
Detailed description of the invention
The continuous casting high-aluminum steel stuffing sand of the present invention, comprises by mass percentage as frame material
29～37% quartz sand, 52～60% chrome ore as base material, 9～12% carbon dust as additive,
As 0.5～2% phenolic resin of binding agent, and phase mix homogeneously forms.
Wherein, described quartz sand contains SiO2>=99wt%, and particle diameter is between 0.15～1.0mm.
Described chrome ore is containing Cr2O3>=50wt%, and particle diameter is between 0.15mm～0.8mm.Institute
The carbon dust stated is containing C >=95wt%, and particle diameter is 0.15～1.0mm.The most both stuffing sand can have been ensured
Bulk density, also can be effectively prevented infiltration of molten steel and enter in the middle of space and solidify and generate solid sintering
Layer, and affect the self-opening rate of high-aluminum steel.
The technology of this stuffing sand requires as follows:
1, chemical index, as shown in table 1: (wt, %)
Table 1
2, stuffing sand granule, for full particle, particle diameter 0.15～1.0mm ＞ 90%, beyond bound
Respectively ≯ 5%；
3, the free moisture of stuffing sand is not more than 0.4%.
4, stuffing sand must not be mixed into foreign body, must not conglomeration block；
The onsite application method of the continuous casting high-aluminum steel stuffing sand of the present invention is as follows:
A., toasting in stuffing sand is placed in drying room, baking temperature is 40～60 DEG C, baking time
For >=24 hours；
B. prepare first about 1 hour of tapping at high-aluminum steel, begin preparing for double argon air brick ladle, the most clear
Foreign body and air brick top cold steel residue in reason clean water ports, then uses and adds sandpipe by stuffing sand introducing
To the mouth of a river, stuffing sand addition controls at stuffing sand upper surface beyond pocket block plane 5～15mm.
In the case of other conditions are essentially identical, only change use unlike material stuffing sand, carry out with
Under several groups of tests:
Group experiment 5 class stuffing sand, carries out special test respectively；
When adding stuffing sand, it is necessary to adding sandpipe, stuffing sand is added to ladle nozzle；
For every stove whether from opening practical situation, carry out statistical analysis and improvement；
Wherein use stuffing sand total following several:
1) 1# stuffing sand, represents: 52% chrome ore, 37% quartz sand, carbon dust by mass percentage
9.8%, phenolic resin 1.2%, its physicochemical property is as shown in table 2.
2) 2# stuffing sand, represents: 53.4% chrome ore, 35% quartz sand, carbon by mass percentage
Powder 11.1%, phenolic resin 0.5%, its physicochemical property is as shown in table 3.
3) 3# stuffing sand, represents: 57% chrome ore, 31.7% quartz sand, carbon by mass percentage
Powder 10.3%, phenolic resin 1%, its physicochemical property is as shown in table 4.
4) 4# stuffing sand, represents: 58% chrome ore, 31% quartz sand, carbon dust by mass percentage
9.5%, phenolic resin 1.5%, its physicochemical property is as shown in table 5.
5) 5# stuffing sand, represents: 60% chrome ore, 29% quartz sand, carbon dust by mass percentage
10.5%, phenolic resin 0.5%, its physicochemical property is as shown in table 6.
Table 21# stuffing sand performance indications
Table 32# stuffing sand performance indications
Table 43# stuffing sand performance indications
Table 54# stuffing sand performance indications
Table 65# stuffing sand performance indications
Concrete test data and result of the test are as follows:
When not using this stuffing sand, original self-opening rate is 29.51%, the most as shown in table 7, adopts
With the stuffing sand of the present invention, test self-opening rate situation such as table 8:
Table 7 existing ladle self-opening rate situation
The ladle self-opening rate situation of each stuffing sand of table 8
Through testing discovery above, the effect using the stuffing sand of the present invention is all fine, and ladle is averagely from opening
Rate is 90%, and combination property has reached each side requirement, is effectively increased change self-opening rate.
In sum, compared with the stuffing sand of other materials original, the present invention has the advantage that
(1) fusing point of stuffing sand can be effectively improved, for the special steel tool that bull ladle temperature is of a relatively high
There is good matching；
(2) full particle is used, rather than hollow particle, and granularity more than 90% all exists
Between 0.15～1.0mm, it is possible to play good skeleton function, both will not cave in easily, and be not easy to
Make molten steel penetrate into and form thicker sinter layer；
(3) material source is easy, produces simple；
(4) this stuffing sand is to high-aluminum steel, particularly 20Mn23AIV, and its ladle self-opening rate has substantially
Raising effect；
(5) this stuffing sand to the ladle refining time in the steel grade of more than 200min, its ladle self-opening rate
Be significantly improved effect；
(6) execute-in-place is simple, pollution-free.
Those of ordinary skill in the art is it should be appreciated that above embodiment is intended merely to
The bright present invention, and it is not used as limitation of the invention, as long as at the spirit of the present invention
In, change, the modification of embodiment described above all will be fallen in the range of claims of the present invention.
Claims (3)
1. a continuous casting high-aluminum steel stuffing sand, it is characterised in that:
Comprise by mass percentage as frame material 29～37% quartz sand, as base material
52～60% chrome ore, 9～12% carbon dust as additive, 0.5～2% phenolic aldehyde as binding agent
Resin, and phase mix homogeneously forms；
Described quartz sand contains SiO2>=99wt%, and particle diameter is between 0.15～1.0mm；
Described chrome ore is containing Cr2O3>=50wt%, and particle diameter is between 0.15mm～0.8mm；
Described carbon dust is containing C >=95wt%, and particle diameter is 0.15～1.0mm.
2. continuous casting high-aluminum steel stuffing sand as claimed in claim 1, it is characterised in that:
Described stuffing sand is full particle, particle diameter 0.15～1.0mm ＞ 90%, each beyond bound
≯ 5%, and the free moisture of stuffing sand is not more than 0.4%.
3. the using method of a continuous casting high-aluminum steel stuffing sand, it is characterised in that:
A., toasting in stuffing sand is placed in drying room, baking temperature is 40～60 DEG C, baking time
For >=24 hours；
B. preparing first 1 hour of tapping at high-aluminum steel, begin preparing for double argon air brick ladle, first cleaning is dry
Foreign body and air brick top cold steel residue in water purification mouth, then uses and adds sandpipe stuffing sand is introduced to water
In mouthful, stuffing sand addition controls at stuffing sand upper surface beyond pocket block plane 5～15mm.
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| CN108421970B (en) * | 2018-03-19 | 2020-05-22 | 河南通宇冶材集团有限公司 | Preparation method of granular chromium drainage sand |
| CN110405192B (en) * | 2019-08-29 | 2021-12-10 | 云南濮耐昆钢高温材料有限公司 | Ladle drainage sand and preparation method thereof |
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Effective date of registration: 20200511 Address after: 200940 room 1277, building 216, 1269 Shuishui Road, Baoshan District, Shanghai Patentee after: Baowu Special Metallurgy Co., Ltd Address before: 200940 No. 1269, Fisheries Road, Shanghai, Baoshan District Patentee before: BAOSTEEL SPECIAL STEEL Co.,Ltd. |
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