CN107208169A - The foaming sedation methods and the manufacture method of clinker product of molten slag - Google Patents
The foaming sedation methods and the manufacture method of clinker product of molten slag Download PDFInfo
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- CN107208169A CN107208169A CN201580075672.1A CN201580075672A CN107208169A CN 107208169 A CN107208169 A CN 107208169A CN 201580075672 A CN201580075672 A CN 201580075672A CN 107208169 A CN107208169 A CN 107208169A
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- China
- Prior art keywords
- clinker
- slag
- deslagging
- refining
- oxygen supply
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention is provided in the middle deslagging process that midway is clipped using a converter type refining furnace continuously carries out the refining of molten iron of two oxygen supply refining procedures, in order to deslagging process in the middle of being implemented with the short time, the foaming of molten slag that can effectively to being expelled in middle deslagging process from converter type refining furnace in slag accepting container carries out calm method.It is 50kgm/s to the momentum that the clinker being contained in slag accepting container (y) sprays time per unit in deslagging in middle deslagging process and/or after deslagging2Water jet (8) above, applies to clinker and flows so that water droplet is rolled into the clinker after foaming, and the thus foaming to clinker carries out calmness.It is rolled into clinker and evaporation, expansion occurs for scattered water droplet, thus the clinker brokenly bubble in bubblement is made, being released into containing gas outside the clinker of bubblement bath (6) for the clinker bath (6) of bubblement, thus makes the foaming of clinker obtain calmness.
Description
Technical field
The present invention relates to continuously carry out two in the middle deslagging process that midway is clipped using a converter type refining furnace
To the molten slag that is expelled in middle deslagging process in slag accepting container in the refining of the molten iron of oxygen supply refining procedure
Foaming carries out calm method.Moreover, it relates to profit in middle deslagging process between desiliconization processing and dephosphorization treatment
With the manufacture method of the clinker product of the foaming sedation methods of the molten slag.
Background technology
In recent years, when entering to be about to the oxygen supply refining of dephosphorization of molten iron or decarburization using converter type refining furnace, protected by molten iron
Middle deslagging process, which is clipped, in the state of being held in a converter type refining furnace, in midway continuously carries out oxygen supply essence in two stages
The method of refining has obtained practical.For example, Patent Document 1 discloses following method：After dephosphorization treatment, molten iron is residual
Stay tilts converter in the state of in converter, only discharges clinker, then implements Decarburising and refining in same converter, by decarburization
Clinker after refining is recycled in the dephosphorization treatment of the molten iron of next time.In addition, Patent Document 2 discloses use one
Converter type refining furnace, the deslagging process for clipping midway continuously carries out the pre- place of the desiliconization processing of molten iron and the molten iron of dephosphorization treatment
(dephosphorization) method of managing.
In these methods, compared with the method for refining that the middle deslagging without midway proceeds oxygen supply refining, tool
Have the following advantages：By the way that clinker is discharged in midway, the usage amount of the CaO systems flux in the processing after can cutting down.
In addition, with not only clinker is discharged but also molten iron is also temporary transient from stove after the oxygen supply refining of first stage is implemented
Discharge, the method for implementing the oxygen supply refining of second stage after being transferred in same stove or other stove is compared, and is had the following advantages that.
(I) running rate for coming out of the stove, being reloaded into the required time and improving stove of molten iron can be shortened.
(II) transfer of molten iron is few, therefore, it is possible to reduce heat release loss.
(III) clinker for refining the oxygen supply of second stage is residued in stove, in the confession of the first stage of the molten iron of next time
Recycled in oxygen refining, the usage amount thus, it is possible to cut down CaO systems flux.
(IV) discharge of the clinker of the oxygen supply refining of the second stage of high alkalinity is reduced, increase basicity is than the first relatively low rank
The discharge of the clinker of the oxygen supply refining of section, the utilization of clinker is promoted thus, it is possible to improve the hydration expansion characteristics of clinker.
In order to enjoy these advantages, in middle deslagging process, how rapidly the clinker of aim parameter to be arranged out of stove
Go out to turn into operational emphasis.In the case that the discharge rate of clinker in middle deslagging process is few, it is impossible to expect as described above
The usage amount that can cut down CaO systems flux effect, the usage amount of CaO systems flux and the method phase of the deslagging without midway
Than not changing much.Therefore, there is following record in patent document 1 and patent document 2：In order to high in middle deslagging process
Deslagging is efficient carried out, molten slag is bubbled in oxygen supply refining in the first stage, increases the volume of molten slag, thus carry
The high clinker in the middle of fire door progress during deslagging apart from fire door lower end bathes the height in face, produced by the overflow for improving molten slag
Expulsion efficiency.Here, the foaming of clinker refers to that the clinker of molten condition contains bubble and showing for volumetric expansion occurs in appearance
As.
But, the foaming of molten slag may not be easily controlled in desired degree, when foaming becomes over, sometimes from
Overflowed in slag accepting container (slag ladle) on the chassis being placed under stove and cause to hinder the state of affairs operated, therefore, no
The velocity of discharge that clinker is not limited while the free space of slag accepting container is confirmed is obtained, when causing the operation of middle deslagging
Between extension.In addition, the capacity of slag accepting container may not fully be universal relative to the volume of the clinker after foaming, must not
The discharge of clinker is carried out after the calmnessization for the foaming being not to wait in slag accepting container, the side of efficient middle deslagging is being carried out
There is problem in face.
In the method disclosed in patent document 2, attempt by monitoring clinker level in the refining before middle deslagging
And be controlled in appropriate clinker level to suppress excess foam formation during middle deslagging, but for the foaming in slag accepting container
Suppress, sufficient effect may not be obtained.In addition, having recorded ripe with higher basicity progress by suppressing needs in patent document 2
Change the generation of the dephosphorization clinker of processing and dephosphorization clinker is converted to even if maturation process is omitted to also to can obtain good volume steady
Qualitatively desiliconization clinker realizes the method utilized of clinker, but the unit volume of the clinker product of the clinker manufacture after bubbling
Weight reduces, therefore, is not suitable for needing the purposes such as the roadbed material that bulk density is more than 1.5kg/L, purposes by
Limitation.
On the other hand, Patent Document 1 discloses following method：In middle deslagging, ore pulp will be contained in terms of dry weight
More than the mass % of slag 35 and below 65 mass %, more than the mass % of copper smelter slag 20 and below 50 mass %, the mass % of oil 3 with
Upper and below 10 mass %, below the mass % of moisture 15 and proportion are 1.5g/cm3Above and 2.5g/cm3Following is block
The calm material of foaming is put into slag ladle, and the foaming to the clinker in slag ladle carries out calmness, while clinker is expelled in slag ladle.
But, in the method, it is possible to the foreign matter from the calm material of foaming is mixed into clinker, in the qualitative control of clinker product
On be not necessarily preferred method.
On the other hand, Patent Document 3 discloses following method：By the clinker after the desiliconization of molten iron, dephosphorization treatment or
After clinker after carbonization treatment is expelled in slag ladle, the water of pink mist is spread in slag surface, thus suppresses foaming.In this method
In, it is believed that calmness is carried out to foaming by the degassing and the effect of surface cure near slag surface, but for desiliconization stove
For the molten iron pre treatment slag of the low alkalinities such as slag, the clinker in slag ladle is made by effect produced by the cooling from surface etc.
Overall foaming calmnessization takes long enough.In addition, discharging clinker while in the case of watering into slag ladle on one side, it is impossible to
Obtain sufficient sedation effect, therefore, for shortening in the middle of activity duration of deslagging and non-effective.
In addition, Patent Document 4 discloses following method：Received by molten iron together with pig bed desiliconization agent to torpedo hot metal mixer car
When middle, the water of more than 20m/s high flow rate is blown to the desiliconization clinker bubbled in torpedo hot metal mixer car, thus suppresses foaming.
In the molten iron being received to together with pig bed desiliconization agent in torpedo hot metal mixer car, constitute the iron oxide of desiliconization agent or contain the iron oxide
Clinker is rolled into due to the sinking of molten iron in molten iron, iron oxide is carried out desiliconization with the pasc reaction in molten iron anti-
Should.But, molten iron temperature now is up to about 1500 DEG C, and the temperature is thermodynamically preferentially to carry out being based on iron oxide and molten iron
In carbon reaction decarburizing reaction condition, therefore, the iron oxide from molten iron is rolled into or the clinker containing iron oxide
In CO gases are produced with high formation speed.The CO gases produced from the molten iron are easily detained due to the relation of interfacial tension
At the interface of molten iron and clinker, formed in molten iron with the interface of clinker and compared thick bubble.The CO gas bubbles pass through clinker
During layer, in the case where the formation speed of bubble becomes big or reaches the small condition of ascent rate, cause slag bloating.In patent text
In the method for offering 4, slag layer is cut using the water of high flow rate and formed for making the path of CO gas removals (effusion), will be stagnant
The CO gas removals at the interface of molten iron and clinker are stayed in, thus suppress the foaming of clinker.In addition, now, the water of high flow rate is reached
Molten iron surface, is reacted with the molten iron of high temperature and causes small steam explosion, staved slag layer using explosive force.
But, in the middle deslagging refined using the oxygen supply of converter type refining furnace, in slag accepting container (slag ladle)
The foaming of clinker as problem includes CO gases with the foaming in patent document 4 as the clinker in the torpedo hot metal mixer car of object
Generation mechanism including generation form is entirely different, therefore, in the method for patent document 4, it is impossible to which deslagging is molten in the middle of suppressing
The foaming of clinker in slag accepting container.That is, in the middle deslagging refined using the oxygen supply of converter type refining furnace, in converter type
Have occurred that the clinker of foaming is discharged in slag accepting container in refining furnace.Now, the temperature of clinker and molten iron compares
It is low, it is about 1350 DEG C, therefore, the viscosity of clinker is of a relatively high.In addition, in stove in the big converter type refining furnace of free space,
Compared with the processing in torpedo hot metal mixer car, speed of oxygen supply, stirring power density difference great disparity, therefore, substantial amounts of micro-bubble is dispersed in
In clinker, and it is trapped in highly viscous clinker.Therefore, clinker maintains bubblement.Melting furnace in slag accepting container
In slag, the scattered iron oxide composition being present in C and clinker in the molten iron in clinker reacts and produces CO gases.The reaction is
The endothermic reaction, with the progress of reaction, the viscosity for further resulting in temperature reduction and clinker raises, therefore, is not to continue with holding
Substantial amounts of CO gases are generated continuously.With the CO gas phases generated in the molten iron that is received in the method for patent document 4 in torpedo hot metal mixer car
Than formation speed is especially low.Inevitably it is mixed into addition, being only existed in the slag accepting container of middle deslagging into clinker
A small amount of molten iron, moreover, not being to make iron oxide using the sinking of substantial amounts of molten iron as the method for patent document 4 or contain
The clinker for having iron oxide is persistently rolled into the situation in the big molten iron bath of thermal capacity, therefore, also will not be in the iron under slag layer
A large amount of interfaces for producing CO gases and making it be stranded in molten iron and clinker in water-bath.It can be seen that, the slag accepting container of middle deslagging
Interior slag bloating with the method for patent document 4 as premise slag bloating situation fundamental difference, therefore can not apply
The method of patent document 4.That is, in the slag accepting container in the middle deslagging refined using the oxygen supply of converter type refining furnace
In the case that such scattered in the clinker of the high viscosity, delay of foaming of clinker has substantial amounts of micro-bubble, in order to promote the gas
Destruction, the disengaging of bubble, even if cut and be formed locally by slag layer using the water of high flow rate as the method for patent document 4
The removing passage of gas, nor effectively.
Prior art literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2008-255446 publications
Patent document 2：International Publication No. 2014/115526
Patent document 3：Japanese Unexamined Patent Publication 8-325619 publications
Patent document 4：Japanese Unexamined Patent Publication 3-291321 publications
The content of the invention
Invent problem to be solved
Therefore, it is an object of the invention to solve problem of the prior art as described above, there is provided using a converter
The middle deslagging process that type refining furnace clips midway is continuously carried out in the refining of molten iron of two oxygen supply refining procedures, in order to be able to
It is enough that middle deslagging is implemented with the short time, effectively it can be received to being expelled to slag from converter type refining furnace in middle deslagging process
The foaming for holding the molten slag in container carries out the foaming sedation methods of calm molten slag.In addition, other mesh of the present invention
Be provide by utilizing the foaming sedation methods and energy in middle the deslagging process between desiliconization processing and dephosphorization treatment
Enough desiliconization clinkers obtained from middle deslagging stably manufacture the manufacture method of the clinker product of the clinker product of high-quality.
Method for solving problem
In order to solve the above problems, the present inventor in middle deslagging molten slag be discharged to slag therein
Slag bloating in accepting container carries out calm method and experiment has been repeated and has studied.As a result, the inventors discovered that, pass through
In middle deslagging or after deslagging, the water jet of regulation momentum is sprayed the molten slag being contained in slag accepting container, it is right
Molten slag applies flowing so that water droplet is rolled into the clinker after foaming, thus makes to be rolled into molten slag and divides
Evaporation, expansion occur for scattered water droplet, thus make the bubbles burst in the clinker in bubblement, as a result, slag bloating is obtained
It is effectively calm.
In addition, it is found that passing through the desiliconization clinker to being discharged in the middle deslagging process between desiliconization processing and dephosphorization treatment
The injection of water jet as described above is carried out, slag bloating is obtained calmness, and make the clinker after cooling, solidification fine and close
Change, the clinker product of the big high-quality of bulk density can be obtained.
The present invention is completed based on such opinion, and its purport is as follows.
[1] the foaming sedation methods of a kind of molten slag, it is to enter to be about to successively using a converter type refining furnace (x)
An oxygen supply refining procedure (A) being pre-processed from the refining of the molten iron oxidation of blast furnace casting, make by an oxygen supply
Above-mentioned molten iron after refining procedure (A) refines an above-mentioned oxygen supply in the state of residuing in above-mentioned converter type refining furnace (x)
The molten slag of generation is expelled to the middle deslagging in slag accepting container (y) from above-mentioned converter type refining furnace (x) in process (A)
Process (B) and two to residuing in the progress dephosphorization treatment of the above-mentioned molten iron in above-mentioned converter type refining furnace (x) and/or carbonization treatment
In the refining of the molten iron of secondary oxygen supply refining procedure (C), to above-mentioned slag accepting container (y) in above-mentioned middle deslagging process (B)
In the foaming of molten slag carry out calm method, it is characterised in that
In deslagging in above-mentioned middle deslagging process (B) and/or after deslagging, to being contained in above-mentioned slag accepting container
(y) molten slag in is so that the momentum of the water jet of time per unit is 50kgm/s2Mode above sprays water jet,
Thus the foaming to above-mentioned molten slag carries out calmness.
[2] a kind of manufacture method of clinker product, it is to be carried out successively to from blast furnace using a converter type refining furnace (x)
The molten iron tapped a blast furnace carries out an oxygen supply refining procedure (a) of desiliconization processing, made after an oxygen supply refining procedure (a)
What above-mentioned molten iron will be generated in an above-mentioned oxygen supply refining procedure (a) in the state of residuing in above-mentioned converter type refining furnace (x)
Desiliconization clinker is expelled to middle deslagging process (b) in slag accepting container (y) from above-mentioned converter type refining furnace (x), to residual
Carry out the secondary oxygen supply refining procedure (c) of dephosphorization treatment in the above-mentioned molten iron in above-mentioned converter type refining furnace (x) and will pass through to be somebody's turn to do
The process (d) of coming out of the stove that above-mentioned molten iron after secondary oxygen supply refining procedure (c) is come out of the stove from above-mentioned converter type refining furnace (x), with upper
The desiliconization clinker for stating discharge in middle deslagging process (b) is used as the manufacture method of the clinker product of raw material, it is characterised in that
In deslagging in above-mentioned middle deslagging process (b) and/or after deslagging, to being contained in above-mentioned slag accepting container
(y) the desiliconization clinker in is so that the momentum of the water jet of time per unit is 50kgm/s2Mode above sprays water jet,
Thus the foaming to clinker carries out calmness, then the discharge desiliconization clinker from slag accepting container (y),
The desiliconization clinker is solidified, above-mentioned clinker product is processed into.
[3] manufacture method of the clinker product as described in [2], it is characterised in that after above-mentioned process (d) of coming out of the stove, not
The molten iron of charging next time will be loaded in the case of clinker discharge in above-mentioned converter type refining furnace (x), an oxygen supply is carried out successively
Refining procedure (a), middle deslagging process (b), secondary oxygen supply refining procedure (c) and process (d) of coming out of the stove.
[4] manufacture method of the clinker product as described in [2] or [3], it is characterised in that by the desiliconization pulverized slag after solidification
Broken, classification, is made the clinker product that bulk density is more than 1.5kg/L.
Invention effect
According to the foaming sedation methods of the molten slag of the present invention, keep pressing from both sides in the state of molten iron in converter type refining furnace
The middle deslagging process for midway is continuously carried out in the refining of molten iron of two oxygen supply refining procedures, can be effectively in
Between the foaming of molten slag that is expelled to from converter type refining furnace in deslagging process in slag accepting container carry out it is calm, therefore,
The molten slag of aim parameter can be quickly expelled to outside stove and terminate middle deslagging in a short time.Turn thereby, it is possible to improve
The running rate of type of furnace refining furnace, improves productivity ratio, therefore, it is possible to the ratio for the implementation charging for improving molten iron pretreatment, Neng Gouxiao
Subtract the usage amount of the CaO systems flux in refining procedure entirety.Or, the clinker discharge rate in middle deslagging can be increased, therefore,
The usage amount of the CaO systems flux in secondary oxygen supply refining procedure can be cut down.It is thus possible to which enough help to cut down CaO systems flux
Manufacture required for energy consumption.
In addition, according to the manufacture method of the clinker product of the present invention, between desiliconization processing and dephosphorization treatment
Between above-mentioned slag bloating sedation methods are utilized in deslagging process, the desiliconization clinker that can be obtained by middle deslagging is stably manufactured
The clinker product of the big high-quality of bulk density.Therefore, it is possible to expand the purposes of the clinker product obtained by desiliconization clinker.
Brief description of the drawings
Fig. 1 is the explanation figure of one that the refining route in the inventive method is shown by process sequence.
Fig. 2 is to being contained in slag accepting container y in the middle deslagging process for be shown schematically in the inventive method
Clinker injection water jet status of implementation explanation figure.
Fig. 3 be from oblique upper in the middle deslagging process of the inventive method to being contained in slag accepting container y
Clinker injection water jet status of implementation shot obtained from photo.
Fig. 4 is the momentum for spraying the clinker in slag accepting container y time per unit in middle deslagging process
The situation of different water jets and do not carry out water jet injection situation show carry out desiliconization processing when be encased in converter type essence
The figure of the Si concentration of molten iron in furnace x and the relation of middle deslagging time.
Fig. 5 show in the middle deslagging process of the inventive method to the clinker injection water in slag accepting container y
An embodiment and its behaviour in service for the equipment of jet, is to make converter type refining furnace x inclined to carry out deslagging
The front view of status display.
Fig. 6 is to make the inclined status displays of converter type refining furnace x to carry out deslagging in Fig. 5 embodiment
Top view.
Fig. 7 is the converter type refining furnace x explanation figure for showing to use in the inventive method.
Embodiment
Hereinafter, one of foaming sedation methods of the molten slag of the present invention is illustrated.
The foaming sedation methods of the molten slag are to enter to be about to go out from blast furnace successively using a converter type refining furnace x
An oxygen supply refining procedure (A) that the molten iron of iron carries out refinement oxide and pre-processed, make to refine by an oxygen supply
The melting that molten iron after process (A) will be generated in the state of residuing in converter type refining furnace x in an oxygen supply refining procedure (A)
Clinker from converter type refining furnace x be expelled to slag accepting container y in middle deslagging process (B) and to residue in converter type refining
Molten iron in stove x is carried out in the refining of the molten iron of the secondary oxygen supply refining procedure (C) of dephosphorization treatment and/or carbonization treatment, in
Between in deslagging in deslagging process (B) and/or after deslagging, to the molten slag that is contained in slag accepting container y so that per single
The momentum of the water jet of position time is 50kgm/s2Mode above sprays water jet, and the thus foaming to clinker carries out calmness
Method.
It can be adopted in various manners as the refining treatment of the molten iron of the premise of the present invention, for example following sides can be enumerated
Formula.
(i) an oxygen supply refining procedure (A) is desiliconization processing, the mode that secondary oxygen supply refining procedure (C) is dephosphorization treatment
(ii) an oxygen supply refining procedure (A) is that desiliconization is handled, secondary oxygen supply refining procedure (C) is dephosphorization/carbonization treatment
Mode
(iii) an oxygen supply refining procedure (A) is that desiliconization/dephosphorization treatment, secondary oxygen supply refining procedure (C) are carbonization treatment
Mode
(iv) mode that an oxygen supply refining procedure (A) is dephosphorization treatment, secondary oxygen supply refining procedure (C) is carbonization treatment
Among these, mainly as object of the present invention be (i) and (iii) mode.
Fig. 1 is shown the refining route of above-mentioned (i), desiliconization processing (de- Si blowing) equivalent to one time oxygen supply by process sequence
Refining procedure (A), dephosphorization treatment (de- P blowing) is equivalent to secondary oxygen supply refining procedure (C).
In Fig. 1, first, the cold iron sources 3 such as scrap iron are loaded in converter type refining furnace x, then, were conveyed from by blast-melted
Load molten iron 1 in the charge packet 4 come, then, carry out desiliconization processing (de- Si blowing) and be used as an oxygen supply refining procedure (A).Should
Desiliconization processing is carried out by supplying the combustion heat source such as oxygen source and the further systems of supply CaO as needed flux, silicon source into stove.
In desiliconization processing, in order to improve the deslagging of clinker in the middle deslagging of subsequent processing, implementation condition is controlled
So that clinker moderately bubbles.The detailed of the implementation condition of desiliconization processing describes below.After desiliconization processing terminates, in
Between deslagging process (B), at least a portion of the clinker 2 generated in being handled in desiliconization (desiliconization clinker) is expelled to slag and houses appearance
In device y (slag ladle).In order to effectively cut down the usage amount of the CaO systems flux in ensuing oxygen supply refining procedure (C), in the middle of this
Clinker discharge rate during deslagging is preferably set to more than the amount of the pact of the clinker 2 in converter type refining furnace x half.Therefore, in order to
Efficiently discharge clinker makes slag bloating so as to improve the state of the surface level of slag layer without discharging molten iron from fire door
Deslagging in the middle of lower progress, its implementation condition etc. is described below in detail.Then, as secondary oxygen supply refining procedure (C), carry out
Dephosphorization treatment (de- P blowing).The dephosphorization treatment is carried out by supplying CaO systems flux and oxygen source, and implementation condition etc. is in detail rear
Described in text.After the dephosphorization treatment, molten iron 1 is come out of the stove, deliver to subsequent processing (carbonization treatment).In this case, can also not
Discharge the clinker 9 (dephosphorization clinker) generated in dephosphorization treatment and directly remain, the desiliconization processing for charging next time.
In the methods of the invention, as described above, using a converter type refining furnace x in two oxygen supply refining procedures
(A), the midway of (C) clips middle deslagging process (B) and continuously carries out above-mentioned two oxygen supply refining procedure (A), the molten iron of (C)
In refining, in the deslagging in middle deslagging process (B) and/or after deslagging, to the melting furnace being contained in slag accepting container y
The water jet of slag (the clinker bath of bubblement) injection regulation momentum, applies to molten slag and flows so that water droplet is rolled into
In clinker after foaming, the thus foaming to clinker carries out calmness.
Fig. 2 schematically shows its status of implementation, and symbol 5 represents that being expelled to slag from converter type refining furnace x houses appearance
Clinker stream in device y, symbol 6 represents the clinker bath of the bubblement in slag accepting container y, and symbol 7 represents water injection nozzle,
Symbol 8 is represented from water jet formed by the water injection nozzle injection water.As shown in Fig. 2 from being configured at slag accepting container y's
The water injection nozzle 7 of top position is to clinker (the clinker bath 6 of bubblement) injection water jet 8 in slag accepting container y.Should
Water jet 8 can spray two respectively from multiple water injection nozzles 7 or from the different jets of single water injection nozzle 7
More than (two strands).
In the methods of the invention, if the mechanism that the foaming to molten slag obtains calmness is illustrated, then it is assumed that as follows.It is right
During the water jet 8 of clinker (the clinker bath 6 of bubblement) abundant momentum of injection after the foaming in slag accepting container y, to stove
Slag applies flowing, and the water droplet of water jet 8 is rolled into the clinker after foaming, and fine water droplet is scattered in clinker.Then, divide
Dissipate the water droplet in the clinker and occur evaporation, expansion, thus, make the micro-bubble largely existed in the clinker in bubblement
Rupture, the gas (predominantly CO gases) that contains that the clinker of bubblement is bathed into 6 is discharged to outside the clinker bath 6 of bubblement,
Thus the foaming of clinker is made to obtain calmness.
Fig. 3 be from oblique upper for after deslagging from injection nozzle to the clinker injection water in slag accepting container (slag ladle)
Photo obtained from the situation of jet is shot, it can be seen that water jet flows along arrow, water is rolled into the stove of bubblement
Situation in slag bath.The impact site of the water jet in face is bathed in clinker, the flowing of clinker is induced, surface is updated, therefore shape
Into the focus of high temperature, the clinker bath surface of surrounding is showed with surface temperature by radiating the surface for cooling down and reducing significantly not
Same complexion.Think the high-temperature portion (focus) on clinker bath surface, the water of water jet is rolled into clinker and with small liquid
Evaporation, expansion occur after disperseing for the form of drop, and substantial amounts of vapor is produced in clinker bath, therefore, are floated using resulting
Power further speeds up the flowing in clinker bath.Think herein, the water and molten slag of the liquid being rolled into molten slag
Interfacial tension be less than its interfacial tension with gas, therefore easily in the liquid film between bubble of the intrusion into molten slag, because
This, occurs evaporation, expansion, thus effectively carries out brokenly bubble in the liquid film between the bubble.
In the methods of the invention, by the time per unit of the water jet 8 of the molten slag injection in slag accepting container y
Momentum be set as 50kgm/s2More than.Here, in the case where water jet 8 is multiple, the momentum setting of time per unit
For its total amount, in the case where the high-temperature portion (focus) on the clinker bath surface of the impact site of water jet produces many places, setting
For the total amount of everywhere.In addition, momentum is usually vector, total amount refers to be added the absolute of obtained momentum with approach vector
Value.
In the present invention, the water jet 8 of abundant momentum is sprayed by the molten slag to bubblement, clinker is applied and flowed
Dynamic so that water droplet is rolled into clinker, evaporation, expansion occur for the water droplet being scattered in the clinker of bubblement, have thus made
Micro-bubble present in clinker after bubble ruptures, but the momentum hour of the time per unit of water jet 8, and molten slag is cooled
Effect it is stronger, it is impossible to apply sufficient flowing to clinker, therefore, it is difficult to be suitably rolled into water droplet in clinker, it is impossible to fully
Be inhibited molten slag foaming effect.In addition, as the injection direction of water jet 8 is close to horizontal direction, it becomes difficult to
Flowing is reached into clinker bath, therefore, more preferably so that the vertical direction composition of the momentum of the time per unit of water jet 8 is
40kg·m/s2Mode above sprays water jet 8.
The upper limit of the momentum of the time per unit of water jet 8 is not particularly limited, but during momentum increase, with molten slag
The amount of dispersing increase tendency, it is therefore preferable that with about 200kgm/s2It is used as the upper limit.Injection water jet 8 be deslagging neutralize/
Or after deslagging, but the volume of the clinker for the bubblement discharged in middle deslagging is big relative to slag accepting container y capacity
In the case of, make the foaming of clinker calm by being sprayed in deslagging, the activity duration of middle deslagging can be shortened, because
This is preferred.Now, the surface level being injected in reference to the clinker bath in the slag accepting container y in middle deslagging of water jet 8
While, with can not make clinker from slag accepting container y overflow and the side of deslagging is efficiently carried out from converter type refining furnace x
Formula is appropriately carried out.In the case where slag accepting container y capacity is fully big, can be sprayed after deslagging water jet 8 with
Realize the densification of clinker.
The position (place) for spraying the clinker face of water jet 8 is not particularly limited, but the situation in the such deslagginves of Fig. 2
Under, preferably sprayed in the way of the whereabouts mouthful (waterfall pool) that at least one water jet 8 bumps against clinker stream 5.After deslagging
In the case of, deslagging terminate after by long-time when, the surface bathed in clinker, solidification layer is flourishing, and water jet 8 is difficult to be rolled into stove
In slag bath, it is therefore preferable that starting the injection of water jet 8 within the time as short as possible within after deslagging terminates about 10 minutes.
As long as spraying the central portion of slag surface of the position in the clinker face of water jet 8 generally in slag accepting container y
In the presence of the calmness that foaming is just sufficient at one, but slag accepting container y is big, focus area is shared by clinker bath surface
In the case that ratio is small, with make focus move by way of make injection water jet clinker face position movement or to set
The mode for putting many places focus sets many places eject position, can make foaming calm with the shorter time, be effective.
In addition, the flow of water jet 8 is bigger, it can more make foaming calm with the shorter time, but with molten slag drop
The amount of dispersing increase tendency.Therefore, as long as increasing the stream of water in the way of to make the activity duration in admissible scope
Measure and be adjusted in the way of the flow of water is reduced in the way of clinker is dispersed in admissible scope, preferably
The flow of water was adjusted in the range of about 100L/ minutes~about 300L/ minutes.The injecting time of water jet 8 is according to by visual observation
The state of sedation for confirming the foaming after injection, the mode suitably shortened in the range of sedation effect is fully obtained are adjusted i.e.
Can.But, increase the flow of water if thinking to make in a short time foaming calm, exist clinker disperse increase the problem of, therefore
It is preferred that adjusting injecting time in the range of about 3 minutes~about 15 minutes.
In general, momentum is conservation, it therefore, there is no need to excessively to consider the flow velocity of water jet 8 from water injection nozzle 7
Decay in a period of untill slag surface is reached, in the momentum (kgm/s of the time per unit of waterjet calculated 82) feelings
Under condition, the flow velocity (m/s) for being sprayed against nozzle exit is multiplied to be calculated with mass flow (kg/s).But, spray
When mouth internal diameter reduces, it is impossible to ignore by the caused decay that is involved in of air, therefore the internal diameter of preferred nozzle (is not circle in section
In the case of, the equivalent diameter calculated for 4 times of sectional area divided by girth) it is more than 5mm.
Fig. 4 be in Fig. 5 described later and Fig. 6 equipment in middle deslagging to the clinker 2 in slag accepting container y
The different situation of water jet 8 of momentum and the situation for the injection for not carrying out water jet of (molten slag) injection time per unit are shown
To row since deslagging when going out the Si concentration for the molten iron for carrying out being encased in during desiliconization processing in converter type refining furnace x with middle deslagging
Slag terminates the figure of the relation of required time (middle deslagging time).The injection of water jet 8 is from the stove in slag accepting container y
At the time of the surface level of slag bath reaches about half of the height in slag accepting container y, also include when deslagging is interrupted
Inside, to make the surface level that clinker is bathed constantly to implement in the way of being suitable for receiving the level of discharge clinker.No matter whether there is
The injection of water jet, the surface level of the clinker bath in slag accepting container y raises and may cause the feelings of the overflow of clinker
Under condition, implement regulation converter type refining furnace x angle of inclination to reduce the velocity of discharge of clinker or interrupt the reply of deslagging.
Therefore, in the conventional middle deslagging of water jet is not sprayed, prolonged frequency is needed in order to discharge target clinker quality
It is high.
According to Fig. 4, by spraying water jet 8, the especially long charging of middle deslagging time is greatly decreased, particularly in water-jet
The momentum of the time per unit of stream 8 is 78kgm/s2In the case of, with 26kgm/s2Situation compare, the middle deslagging time
Long charging is further reduced, thus, it can be known that the suppression for slag bloating is more effective, the situation phase with not spraying water jet
Than the middle deslagging time of about 3 minutes of being calculated as with average value can be shortened.
Fig. 5 and Fig. 6 show to be used for spray water jet to the clinker in slag accepting container y (slag ladle) in middle deslagging
An embodiment and its behaviour in service for equipment, Fig. 5 be with make to carry out deslagging converter type refining furnace x (converter) tilt
Status display front view, Fig. 6 is the top view of equal state.
In the side in converter type refining furnace x (converter) and stop at the slag accepting container y (slag ladle) of deslagging position
Top position water injection nozzle 7 is set, in the deslagging of middle deslagging process and/or after deslagging, from water injection nozzle, 7 pairs melt
The water jet 8 of molten slag injection regulation momentum in slag accepting container y, applies to molten slag and flows so that water droplet is rolled up
Enter in the clinker to after foaming.
Water is supplied to water injection nozzle 7 from feed pipe 11, the water supply list for including the feed pipe 11 is protected using thermal wall 10
Hot influence when member is from deslagging.In addition, as shown in dotted line in Fig. 5 and Fig. 6, water injection nozzle 7 is preferably provided with can be along water
Square to above-below direction adjust injection direction unit, so that the in-position of water jet can be adjusted.Thereby, it is possible to follow with
The position for the slag accepting container y that converter type refining furnace x angle of inclination is matchingly adjusted, and slag can also be adjusted
The in-position of the water jet 8 of slag surface in accepting container y.
, similarly can be in middle deslagging in slag accepting container y in other refining routes according to the present invention
The foaming of clinker carries out calm, and productivity ratio is improved thus, it is possible to shorten the time required for middle deslagging.For example, prostatitis
In (i)~(iv) lifted refining route, an oxygen supply refining procedure (A) is that desiliconization is handled, secondary oxygen supply refining procedure (C) is
The refining route of (ii) of dephosphorization/carbonization treatment is particularly in the case where the silicone content of molten iron is high, additional silicon is used as the combustion heat
Source and handled in the case of carrying out substantial amounts of scrap melting, with desiliconization while implement in the case of carrying out desulphurization reaction etc., from de-
Clinker composition control in phosphorus/carbonization treatment, prevent from returning from the viewpoint of sulphur from clinker, after deslagging in the middle of reducing
Residual slag amount.Therefore, it is generally many using first molten iron is come out of the stove and then by the method for the substantially all discharge of clinker in stove.
In addition, it is carbonization treatment that an oxygen supply refining procedure (A), which is desiliconization/dephosphorization treatment, secondary oxygen supply refining procedure (C),
Refining route and (i) refining route of (iii) more commonly use side by side, but due in an oxygen supply refining procedure (A)
Carry out to dephosphorization, therefore, compared with the situation of the refining route of (i), the basicity of clinker is conditioned higher.But, in order to
It is easy to deslagging in middle deslagging and the refining route in terms of making slag bloating with (i) is common, is used as the dephosphorization of molten iron
Processing, the basicity of clinker is adjusted to than about 1.2~about 1.8 relatively low scope, and improve the iron oxide concentration in clinker
So as to promote the foaming of clinker.Therefore, in middle deslagging, situation with the refining route of (i) is similarly, the presence of being easily caused
The problem of middle deslagging time lengthening, be effective using the foaming sedation methods of the molten slag of the present invention.
In addition, it is carbonization treatment that an oxygen supply refining procedure (A), which is dephosphorization treatment, secondary oxygen supply refining procedure (C),
(iv) molten iron of the refining route to have carried out desiliconization processing in advance is taking off as object, but in order to efficiently carry out middle deslagging
Need to add substantial amounts of silica source in phosphorus processing.Therefore, generally use first comes out of the stove molten iron and then clinker in stove is basic more
The method all discharged.
Then, the manufacture method to the clinker product of the present invention is illustrated.
The manufacture method of the clinker product is to be carried out successively to the molten iron from blast furnace casting using a converter type refining furnace x
Carry out an oxygen supply refining procedure (a) of desiliconization processing, residue in the molten iron after an oxygen supply refining procedure (a)
The desiliconization clinker of generation in an oxygen supply refining procedure (a) is arranged from converter type refining furnace x in the state of in converter type refining furnace x
Go out the middle deslagging process (b) into slag accepting container y, carried out to residuing in the molten iron in converter type refining furnace x at dephosphorization
Reason secondary oxygen supply refining procedure (c) and the molten iron after the secondary oxygen supply refining procedure (c) is gone out from converter type refining furnace x
The process (d) of coming out of the stove of stove, makes after the desiliconization clinker solidification of discharge in middle deslagging process (b), is processed into the clinker of clinker product
The manufacture method of product, wherein, in the deslagging in middle deslagging process (b) and/or after deslagging, appearance is housed to being contained in slag
Desiliconization clinker in device y is so that the momentum of the water jet of time per unit is 50kgm/s2Mode above sprays water jet,
Thus the foaming to clinker carries out calm, the then discharge desiliconization clinker from slag accepting container y, and solidify it.
Fig. 1 also show one of the refining route (by process sequence) in the manufacture method of the clinker product of the present invention,
Desiliconization processing (de- Si blowing) is that oxygen supply refining procedure (a), a dephosphorization treatment (de- P blowing) are secondary oxygen supply refining procedure
(c) mode is equivalent to above-mentioned one.The content of each operation described in the Fig. 1 is as previously described.In addition, the implementation of each operation
The detailed of condition describes below.
In the methods of the invention, it is as described above, clip using a converter type refining furnace x the middle deslagging work of midway
Sequence (b) continuously implements the oxygen supply refining procedure (c) for carrying out the oxygen supply refining procedure (a) of desiliconization processing and carrying out dephosphorization treatment
In the refining of molten iron, in the deslagging in middle deslagging process (b) and/or after deslagging, to being contained in slag accepting container y
The water jet of desiliconization clinker (the clinker bath of bubblement) injection regulation momentum, applies to desiliconization clinker and flows so that water droplet quilt
It is rolled into the clinker after foaming, the thus foaming to clinker carries out calmness, then, desiliconization is discharged from slag accepting container y
Clinker, and solidify it.Then, the desiliconization clinker is processed and (is generally crushed, be classified), thus obtain clinker
Product.
On the injection of the water jet to the desiliconization clinker, its status of implementation, by the jet band of water jet come deslagging
Equipment used in the shortening effect of time, the injection of water jet etc. as illustrated by being based on Fig. 2~Fig. 6 before.
In the methods of the invention, by de- to what is discharged in the middle deslagging process between desiliconization processing and dephosphorization treatment
Silicon clinker carries out the injection of water jet as described above, slag bloating is obtained calmness, and make the stove after cooling, solidification
Slag is densified, and obtains the clinker product of the big high-quality of bulk density.
In the methods of the invention, in order that the clinker after cooling, solidification is densified and increased the unit volume of clinker product
Weight, when spraying water jet to the desiliconization clinker in slag accepting container y preferably in middle deslagging process (b), so that desiliconization
The bulk specific gravity of clinker sprays water jet for more than 0.7kg/L mode, and the foaming to clinker carries out calmness, then, by slag
Desiliconization clinker in accepting container y is expelled in slag, is let cool, is solidified it.With the progress of solidification, further deaeration, stove
Stomata in slag is reduced, but in slag accepting container y by way of making bulk specific gravity as more than 0.7kg/L to bubble into
Slag is expelled to after row is calm, the bulk density that can make clinker product is stably more than 1.5kg/L.
In addition, considering from viewpoint similar to the above, preferably make the total injection water of water jet sprayed desiliconization clinker
Measure as 30~150L/ desiliconization clinker-t (ton).When spraying water less, deaeration is insufficient, sometimes the unit volume weight of clinker product
Amount is reduced.Even if in addition, making injection water more than that, effect also saturation, also, when further water is sprayed in increase is being sprayed
Hit and partly solidified, the porosity in solidification clinker may increase on the contrary.
Cooling, the desiliconization clinker of solidification are generally crushed, are classified and stove is made after being discharged in middle deslagging process (b)
Slag product, but be as described above fine and close using the desiliconization clinker after the inventive method cooling, solidification, therefore, it is possible to easily
It is met more than the bulk density 1.5kg/L required in base course material purposes clinker product.Without water-jet
Clinker product obtained from the injection of stream is porous (therefore being low-intensity), and bulk density is small, therefore is unsatisfactory for Japan
Industrial standard JIS A 5015:The standard of articles of base course material specified in 2013.Further, since clinker particle is porous
And low intensity, harmful effect is also resulted in it is therefore possible to other characteristics to support force etc., this desiliconization clinker is not suitable for roadbed
Material applications.On the other hand, clinker product obtained from the injection of water jet is carried out using the inventive method is fine and close, unit
Volume weight increases, and meets above-mentioned standard of articles.
Dephosphorization clinker generally high alkalinity compared with desiliconization clinker, therefore, because the characteristic such as hydration dilatancy, for soil
During wood material, purposes is restricted mostly.Therefore, reduce the yield of dephosphorization clinker to try one's best, be converted into dephosphorization clinker
This purposes restricts few desiliconization clinker, preferably the dephosphorization treatment of secondary charging and after the molten iron in stove is come out of the stove before the end, no
The dephosphorization clinker in stove is discharged, loads new molten iron in the state of the dephosphorization clinker for making previous charging is residued in stove, repeats
Carry out the refining procedure of the present invention.That is, by by molten iron carry out dephosphorization treatment secondary oxygen supply refining procedure (c) after iron
After the process (d) of coming out of the stove that water is come out of the stove from converter type refining furnace, the clinker in converter type refining furnace x is not discharged and loads next charging
Molten iron, oxygen supply refining procedure (a), middle deslagging process (b), secondary oxygen supply refining procedure (c) are carried out successively and is come out of the stove
Process (d).In this method, additionally it is possible to cut down the usage amount of CaO systems flux when desiliconization is handled.
In addition, in the clinker product obtained in the present invention, especially by making (quality %CaO)/(quality %SiO2)
For 0.8~1.5 and " after process (d) of coming out of the stove, the clinker in converter type refining furnace x is not discharged and load next time charging iron
Water, repeats the refining procedure of the present invention " the obtained clinker product of method have not only fine and close, bulk density it is big and
And the few characteristic of low alkali, swell increment, it may be said that it is particularly suitable for roadbed material purposes.
Then composition, to the converter type refining furnace x that is used in the present invention and the desiliconization processing carried out in the present invention, in
Between deslagging, implementation condition (implementation condition beyond the implementation condition described) of dephosphorization treatment be described in detail.
Fig. 7 shows the converter type refining furnace x used in the present invention one (outline section).Converter type refining furnace x is
Can top blast and bottom blowing converter, possess the liftable oxygen supply spray gun 12 (top-blown spray gun) of top blast, also, set in bottom of furnace body
The bottom blowing nozzle 13 (bottom blowing tuyere) of gas bottom blowing is equipped with, the sidepiece in upper of furnace body side is provided with plug for outlet 14.
Oxygen (industrial purity oxygen) or oxygen-containing gas (oxygen-enriched air, air, oxygen are supplied to molten iron from oxygen supply spray gun 12
With the mixed gas of inert gas etc.) it is used as gas oxygen source.In addition, the molten iron from bottom blowing nozzle 13 into stove is blown into stirring
Bottom blown gas (inert gas such as argon gas, nitrogen, containing aerobic gas etc.).Alternatively, it is also possible to be used as conveying gas using bottom blown gas
Body is blown into flux etc..
In the present invention, the desiliconization carried out as an oxygen supply refining procedure (A) or as an oxygen supply refining procedure (a)
Processing is by being used as oxygen source to the molten iron supply gas oxygen source in converter type refining furnace x and then supplying iron oxide etc. as needed
Solid oxygen source is carried out.Oxygen in the silicon and oxygen source that contain in molten iron reacts (Si+2O → SiO2) and carry out desiliconization processing.
The heat of oxidation of silicon produced by the desilication reaction raises molten iron temperature, promotes the fusing of the cold iron source in molten iron.
Gas oxygen source is fed through oxygen supply spray gun 12 carrying out, and the solid oxygen sources such as iron oxide are loaded as needed, are used for
The combustion heat sources such as regulation generated flux (CaO systems flux, MgO systems flux etc.), the silicon source of basicity of clinker.In addition, passing through
Stirring gas is blown into molten iron from bottom blowing nozzle 13, is strengthened the stirring of molten iron and is promoted the fusing of cold iron source.
As the supply method of the solids such as solid oxygen source, flux, generally, granular and block material is filled from the hopper on stove
Enter, the material of powdery is supplied by oxygen supply spray gun 12, bottom blowing nozzle 13.
In addition, the deslagging in order to improve the clinker in middle deslagging process, makes clinker be risen in converter type refining furnace x
Bubble, for this reason, it may be necessary to improve by the iron oxide in clinker with being rolled into the carbon contained in the molten iron in clinker with drops
The generation speed for the CO gases for reacting and producing.Therefore, the iron oxide concentration improved in clinker is effective, using increasing oxygen supply
Speed, addition solid oxygen source, increase spray gun height, reduce Bottom Blowing Gas Flow Rate as method, foaming can be promoted.The opposing party
Face, when the foaming of clinker becomes in refining, is produced clinker and overflows, caused due to the interruption of refining from fire door sometimes
The problems such as processing time extends.It is therefore preferable that with reference to the slag layer of bubblement surface level actual conditions by above-mentioned behaviour
Make factor controlling in proper range.
In middle deslagging process (B) or middle deslagging process (b), make converter type refining furnace x to being provided with plug for outlet
The opposite side in 14 side is tilted, and the clinker in stove is flowed out from fire door, is expelled in the standby slag accepting container y in lower section
In (slag ladle).The middle deslagging is carried out in the state of slag bloating is made, and a part for usual clinker is residued in stove.
In the present invention, in the middle deslagging process, carry out foregoing to the clinker in slag accepting container y
The injection of water jet.
In the present invention, the dephosphorization carried out as secondary oxygen supply refining procedure (C) or as secondary oxygen supply refining procedure (c)
Processing to residuing in the supply CaO system's flux of the molten iron in converter type refining furnace x and oxygen source after middle deslagging process by entering
OK.The oxygen source supplied in the dephosphorization treatment and desiliconization handle in the same manner as since confess the gas oxygen source of oxygen spray gun 12 as main body,
But the solid oxygen source such as iron oxide can also be applied in combination.
As the supply method of the solids such as solid oxygen source, flux, generally, granular and block material is filled from the hopper on stove
Enter, the material of powdery is supplied by oxygen supply spray gun 12, bottom blowing nozzle 13.
Oxygen in the oxygen source that phosphorus in molten iron is supplied is aoxidized and forms phosphorous oxides (P2O5), the phosphorous oxides
With 3CaOP2O5The form of so compound of stable form, which is mixed into the scorification by CaO systems flux, to be generated and is used as dephosphorization
In the clinker of refining agent function, the dephosphorisation reaction of molten iron is carried out.After dephosphorization treatment, the dephosphorization containing phosphorous oxides is generated
Clinker.
After the completion of dephosphorization treatment, converter type refining furnace x is tilted to the side for being provided with plug for outlet 14, converter type is refined
Molten iron in stove x is come out of the stove (process of coming out of the stove) from plug for outlet 14.This is come out of the stove after process, dephosphorization clinker in stove can not be discharged and to
Load molten iron in converter type refining furnace x, start the desiliconization processing of charging next time.
Embodiment
In the converter type refining furnace of 330 tons of molten iron capacity as shown in Figure 7, clip middle deslagging process and continuously carry out
Desiliconization processing (de- Si blowing) and dephosphorization treatment (de- P blowing) from the molten iron of blast furnace casting, in middle deslagging process, change
The injection conditions of water jet, implement repeatedly to spray the desiliconization clinker that is contained in slag accepting container water jet and to desiliconization stove
The foaming of slag carries out calm operation (comparative example 1~4 and example 1~4).In middle deslagging process, such as Fig. 5 and figure are used
Equipment shown in 6, the surface of the clinker bath in deslagging in slag accepting container is reached after defined level, to being contained in slag
Desiliconization clinker (the clinker bath of bubblement) in accepting container starts the injection of water jet.Middle deslagging relaying is continuous to carry out water-jet
The injection of stream, the surface level rise of the clinker bath in slag accepting container and in the case of the overflow of clinker may being caused,
Adjust the angle of inclination of converter type refining furnace to reduce the velocity of discharge of clinker or interrupt deslagging, proceed water jet
Injection.After deslagging terminates, the surface of the clinker bath in slag accepting container is higher than regulation corresponding with bulk specific gravity 0.7kg/L
In the case of level, water jet injecting time be within about 10 minutes in the range of proceed the injection of water jet, with
The surface for bathing clinker is reached below prescribed level.
In converter type refining furnace, in advance load cold iron source (scrap iron), load thereto from charge packet it is blast-melted after, enter
Row desiliconization is handled.In desiliconization processing, oxygen is supplied from oxygen supply spray gun, and blender gas is blown into molten iron from bottom blowing nozzle
Body.In addition, loading solid oxygen source (iron oxide), flux (CaO systems flux etc.), silicon source (ferrosilicon) as needed.At the desiliconization
In reason, in order to improve the deslagging of the clinker in middle deslagging process, the basicity of clinker is adjusted to 0.8~1.3 scope, simultaneously
And regulation speed of oxygen supply and spray gun height, it is 10~30 matter to be thus set as making the iron oxide content in the clinker after desiliconization processing
% operating condition is measured, makes slag bloating.
In middle deslagging process, converter type refining furnace is set to be tilted to the opposite side in the side with being provided with plug for outlet,
The clinker in stove is flowed out from fire door, be expelled in the standby slag accepting container in lower section.Now, with the condition shown in table 1
To clinker (the clinker bath of bubblement) injection water jet in slag accepting container.The injection of the water jet is using being arranged on one
One or two injection nozzle of the leading section of root feed pipe, is entered with the central portion that face is bathed towards the clinker in slag accepting container
The mode of row injection adjusts injection direction to carry out.In the case where using two injection nozzles, the center of water jet exists
At a distance of about 0.7m in the surface level of clinker bath, but the focus on clinker bath surface merges and turned at one.In slag accepting container
Clinker foaming it is calm after, slag accepting container is delivered to slag, desiliconization clinker is expelled to from slag accepting container
Slag, lets cool, solidifies it.Desiliconization clinker after this is solidified carries out coarse crushing using jumbo, further after cooling, enters
Row is crushed, classification, and it is the clinker product of the base course material all passed through in 26.5mm sieve to be made from mesh.
In each operation (example 1~4 and comparative example 1~4), implement the pre- place of the molten iron of about 50 chargings respectively
Reason.By the average value of the middle deslagging time in middle deslagging process and the bulk density of resulting clinker product with
Between the injection conditions of water jet in deslagging process be shown in Table 1 together.
In any operation, the Si concentration of the molten iron of desiliconization before processing stablizes the scope in 0.25~0.45 mass %
Interior, the average discharge of the clinker in middle deslagging is the charging of about 10 tons/time.According to table 1, in example of the present invention, middle deslagging
Terminate in a short time, moreover, having obtained the clinker of the big high-quality of bulk density by the desiliconization clinker after middle deslagging
Product.
Symbol description
X converter type refining furnaces
Y slag accepting containers
1 molten iron
2 clinkers (desiliconization clinker)
3 cold iron sources
4 charge packets
5 clinker streams
The clinker bath of 6 bubblements
7 water injection nozzles
8 water jets
9 clinkers (dephosphorization clinker)
10 thermal walls
11 feed pipes
12 oxygen supply spray guns
13 bottom blowing nozzles
14 plug for outlet
Claims (4)
1. a kind of foaming sedation methods of molten slag, it is to enter to be about to from height successively using a converter type refining furnace (x)
The refining of molten iron oxidation that stove taps a blast furnace and pre-processed an oxygen supply refining procedure (A), make by oxygen supply refining
The molten iron after process (A) residue in the converter type refining furnace (x) in the state of by an oxygen supply refining procedure
(A) molten slag of generation is expelled to the middle deslagging process in slag accepting container (y) from the converter type refining furnace (x) in
(B) the secondary confession of dephosphorization treatment and/or carbonization treatment and to residuing in the molten iron in the converter type refining furnace (x) is carried out
In the refining of the molten iron of oxygen refining procedure (C), in the slag accepting container (y) in the middle deslagging process (B)
The foaming of molten slag carries out calm method, it is characterised in that
In deslagging in the middle deslagging process (B) and/or after deslagging, to being contained in the slag accepting container (y)
Molten slag so that the water jet of time per unit momentum be 50kgm/s2Mode above sprays water jet, thus right
The foaming of the molten slag carries out calm.
2. a kind of manufacture method of clinker product, it is to be carried out successively to from blast furnace casting using a converter type refining furnace (x)
Molten iron carry out desiliconization processing an oxygen supply refining procedure (a), make it is described after an oxygen supply refining procedure (a)
The desiliconization that molten iron will be generated in the state of residuing in the converter type refining furnace (x) in an oxygen supply refining procedure (a)
Clinker is expelled to middle deslagging process (b) in slag accepting container (y) from the converter type refining furnace (x), to residuing in
State the molten iron in converter type refining furnace (x) carry out dephosphorization treatment secondary oxygen supply refining procedure (c) and will be secondary by this
The process (d) of coming out of the stove that the molten iron after oxygen supply refining procedure (c) is come out of the stove from the converter type refining furnace (x), with described
Between in deslagging process (b) discharge desiliconization clinker as the clinker product of raw material manufacture method, it is characterised in that
In deslagging in the middle deslagging process (b) and/or after deslagging, to being contained in the slag accepting container (y)
Desiliconization clinker so that the water jet of time per unit momentum be 50kgm/s2Mode above sprays water jet, thus right
The foaming of clinker carries out calmness, then the discharge desiliconization clinker from slag accepting container (y),
The desiliconization clinker is solidified, the clinker product is processed into.
3. the manufacture method of clinker product as claimed in claim 2, it is characterised in that after the process (d) of coming out of the stove, not
The molten iron of charging next time will be loaded in the case of clinker discharge in the converter type refining furnace (x), an oxygen supply is carried out successively
Refining procedure (a), middle deslagging process (b), secondary oxygen supply refining procedure (c) and process (d) of coming out of the stove.
4. the manufacture method of clinker product as claimed in claim 2 or claim 3, it is characterised in that by the desiliconization pulverized slag after solidification
Broken, classification, is made the clinker product that bulk density is more than 1.5kg/L.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-023839 | 2015-02-10 | ||
| JP2015023839A JP5888445B1 (en) | 2015-02-10 | 2015-02-10 | Method for calming molten slag and method for producing slag product |
| PCT/JP2015/001874 WO2016129016A1 (en) | 2015-02-10 | 2015-03-31 | Method for inhibiting foaming of molten slag, and method for manufacturing slag product |
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| CN107208169A true CN107208169A (en) | 2017-09-26 |
| CN107208169B CN107208169B (en) | 2019-06-21 |
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| JP (1) | JP5888445B1 (en) |
| KR (1) | KR101997377B1 (en) |
| CN (1) | CN107208169B (en) |
| BR (1) | BR112015009830B1 (en) |
| TW (1) | TWI585061B (en) |
| WO (1) | WO2016129016A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111712585A (en) * | 2018-04-24 | 2020-09-25 | 日本制铁株式会社 | Foaming and calming method for discharging slag and refining equipment for same |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| BR112019012533A2 (en) | 2016-12-27 | 2019-11-19 | Jfe Steel Corp | method for molten iron dephosphorization, and refining agent |
| WO2018146754A1 (en) * | 2017-02-08 | 2018-08-16 | 新日鐵住金株式会社 | Method for controlling slag foaming |
| KR20190086726A (en) * | 2017-02-20 | 2019-07-23 | 닛폰세이테츠 가부시키가이샤 | Slag foaming soot and slag foaming calming method and converter winding method |
| JP6420873B2 (en) * | 2017-07-20 | 2018-11-07 | 株式会社マネースクエアＨｄ | Financial product transaction management device, program |
| JP6835233B2 (en) * | 2017-08-25 | 2021-02-24 | 日本製鉄株式会社 | Slag forming suppression method and converter refining method |
| JP6766796B2 (en) * | 2017-11-20 | 2020-10-14 | Ｊｆｅスチール株式会社 | How to sedate slag |
| JP6915522B2 (en) * | 2017-12-15 | 2021-08-04 | 日本製鉄株式会社 | Slag forming suppression method and converter refining method |
| JP7147550B2 (en) * | 2018-12-27 | 2022-10-05 | 日本製鉄株式会社 | Slag foaming suppression method and converter refining method |
| JP7393634B2 (en) | 2019-12-13 | 2023-12-07 | 日本製鉄株式会社 | Slag forming sedation method |
| JP7375802B2 (en) * | 2020-12-04 | 2023-11-08 | Ｊｆｅスチール株式会社 | Method for suppressing slag forming, sedative injection nozzle and sedative injection device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0254725A (en) * | 1988-08-17 | 1990-02-23 | Sumitomo Metal Ind Ltd | Method for preventing foaming of molten slag |
| JPH03291321A (en) * | 1990-04-09 | 1991-12-20 | Kawasaki Steel Corp | Refining method for molten metal |
| JPH05195040A (en) * | 1992-01-13 | 1993-08-03 | Daido Steel Co Ltd | Treatment of steelmaking slag |
| JPH08325619A (en) * | 1995-05-29 | 1996-12-10 | Nippon Steel Corp | Method for restraining foaming of steelmaking slag |
| WO2014115526A1 (en) * | 2013-01-24 | 2014-07-31 | Ｊｆｅスチール株式会社 | Preliminary processing method for molten iron |
| JP2014159632A (en) * | 2013-01-24 | 2014-09-04 | Jfe Steel Corp | Method for pre-treating molten iron |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4907411B2 (en) | 2007-04-06 | 2012-03-28 | 新日本製鐵株式会社 | Slag sedation method |
| JP5954551B2 (en) * | 2013-01-18 | 2016-07-20 | Ｊｆｅスチール株式会社 | Converter steelmaking |
-
2015
- 2015-02-10 JP JP2015023839A patent/JP5888445B1/en active Active
- 2015-03-31 WO PCT/JP2015/001874 patent/WO2016129016A1/en active Application Filing
- 2015-03-31 CN CN201580075672.1A patent/CN107208169B/en active Active
- 2015-03-31 BR BR112015009830-4A patent/BR112015009830B1/en active IP Right Grant
- 2015-03-31 KR KR1020177021562A patent/KR101997377B1/en active IP Right Grant
- 2015-09-01 TW TW104128753A patent/TWI585061B/en active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0254725A (en) * | 1988-08-17 | 1990-02-23 | Sumitomo Metal Ind Ltd | Method for preventing foaming of molten slag |
| JPH03291321A (en) * | 1990-04-09 | 1991-12-20 | Kawasaki Steel Corp | Refining method for molten metal |
| JPH05195040A (en) * | 1992-01-13 | 1993-08-03 | Daido Steel Co Ltd | Treatment of steelmaking slag |
| JPH08325619A (en) * | 1995-05-29 | 1996-12-10 | Nippon Steel Corp | Method for restraining foaming of steelmaking slag |
| WO2014115526A1 (en) * | 2013-01-24 | 2014-07-31 | Ｊｆｅスチール株式会社 | Preliminary processing method for molten iron |
| JP2014159632A (en) * | 2013-01-24 | 2014-09-04 | Jfe Steel Corp | Method for pre-treating molten iron |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111712585A (en) * | 2018-04-24 | 2020-09-25 | 日本制铁株式会社 | Foaming and calming method for discharging slag and refining equipment for same |
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| Publication number | Publication date |
|---|---|
| BR112015009830B1 (en) | 2021-01-05 |
| JP5888445B1 (en) | 2016-03-22 |
| TW201628992A (en) | 2016-08-16 |
| KR20170103850A (en) | 2017-09-13 |
| JP2016148061A (en) | 2016-08-18 |
| BR112015009830A2 (en) | 2017-07-11 |
| TWI585061B (en) | 2017-06-01 |
| KR101997377B1 (en) | 2019-07-05 |
| WO2016129016A1 (en) | 2016-08-18 |
| CN107208169B (en) | 2019-06-21 |
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