CN102703636A - Continuous refining method and continuous refining facility - Google Patents

Abstract

The number of blades (16) of an impeller (10), as well as the relations between the height (b0) of the base of the blade (16) and the height (b1) of the tip end, between the width (d) of the blade (16) and the diameter or width of a hot meal channel, between the maximum depth (Z) of hot metal flowing through the hot metal channel and the distance (h1) from the upper end of the blade tip end to the upper surface of hot metal, between the maximum depth (Z) of hot metal flowing through the hot metal channel and the distance (h2) from the lower end of the blade tip end to the deepest of the bottom of the hot metal channel are set, whereby a refining efficiency is improved and stable desilconizing or desulfurizing is possible without variations.

Description

Continuous refining method and continuous refining equipment

The application is an application number: 200680042444.5, and the applying date: 2006.12.08, denomination of invention: the dividing an application of the application of " continuous refining method and continuous refining equipment ".

Technical field

The present invention relates to a kind of molten iron carried out purified continuous refining method and continuous refining equipment continuously.

Background technology

Reduce and the molten iron that taps a blast furnace at blast furnace (blast furnace), general except that the silicon (Si) that comprises about 0.3～0.7%, also comprise the carbon (C) about 4.3～4.6%, about 0.09～0.13 phosphorus (P).To carry out the steel that refining forms regulation to this molten steel, carbon (C) and phosphorus (P) are reduced to below the normality, but from the purified viewpoint, hope also that before decarburization, dephosphorization silicon (Si) and sulphur (S) are reduced to minimum concentration (for example silicon 0.25%) to be removed.

In addition, be thermo-negative reaction in order to carry out through reduction reaction that desulfurization handles, hope that also the way of the high iron notch (tap hole trough) of the top temperature of flowing through, carrying out desulfurization afterwards from blast furnace casting (tap hole) handles.

Desiliconization in iron notch, desulfurization are handled, and adopt mostly

(1) mode that refining agent is sprayed with carrier gas such as nitrogen, air from spray gun in iron notch,

(2) utilize refining agent made an addition to after the upper surface of molten iron, make the mode of the potential energy of its molten iron that carries out through the stage portion that is arranged at iron notch,

(3) add refining agent in the right on that is being arranged at the sloping portion of iron notch (pouring into stream), utilize by following order iron notch → the pour into mode of the potential energy of stream (tilting runner) → hot metal ladle (hot metal ladle) mobile molten iron.

But, seize the temperature that makes molten iron and reduce a lot owing to (1) mode reaction efficiency sensible heat low, molten iron is launched into gas.In addition, also owing to increasing cost of equipment with the relevant equipment of force feed refining agent powder.

Though (2) mode has and can remove this great advantage in actually operating at the slag of accomplishing on the blast furnace tapping floor after handling, and has the low problem of reaction efficiency with data by MoM and MEI.

Though (3) reaction efficiency of mode acutely needs the setting of freeboard (free board) than higher owing to the foaming of slag.Freeboard reduces the molten iron tonburden to hot metal ladle or mixer type iron ladle car (torpedo car) significantly, reduces production efficiency.In addition, if the slag foaming then because slag gets into hot metal ladle or mixer type iron ladle car with molten iron, thereby needs other slags to remove device.

(1) of in iron notch, reacting, (2) processing mode; Though no matter the slagging-off (slag-off) that can be omitted in following operation is all favourable aspect heat or time; But owing to be only to rely on the blended of even flow when iron notch to handle, thereby reaction efficiency is low.

The method that the disclosed desulfurization of patent documentation 1 is handled is a kind of through adding sweetening agent and make impeller (agitating vane) invade in this molten iron and make wheel rotation, the method for carrying out desulfurization being contained in molten iron in the casting ladle.

Patent documentation 2 disclosed desiliconizing treatment methods are that a kind of molten iron stream through the blast furnace tapping floor is provided with the desilication reaction groove, add desiliconization agent in the molten iron in the desiliconization conveyer trough and stir the method that this molten iron carries out desulfurization with impeller.

In above-mentioned desulfurization processing and desiliconization processing; Two kinds of processing all are to stir the method that molten iron is handled with impeller; With respect in desulfurization is handled, under the state that molten iron is contained in the casting ladle, stirring molten iron; In desiliconization is handled, different with the desulfurization processing, be that the molten iron of even flow through the molten iron stream of blast furnace tapping floor stirred.

Therefore, from execute-in-place, can enumerate following problem; That is, desulfurization shown in patent documentation 1 is handled, and stirs the molten iron that is detained everywhere and carries out desulfurization and handle that to compare be to be relatively easy to; And it is of patent documentation 2; Even the molten iron that stirs continuous flow everywhere with impeller carries out the desiliconization processing and difficulty is handled in desulfurization, when reducing refining efficiency, not only zero deflection but also stable was carried out desiliconization and desulfurization.

In addition; Patent documentation 2 disclosed technology, though through being provided with the desiliconization slot of bigger capacity, but make molten iron stop the some time and contact with refining agent and improve speed of response at the complete blended desiliconization slot of hypothesis; But; The problem that exists is that its leeway must be provided with desiliconization slot and be difficult for guaranteeing to be provided with the position, has also increased cost of equipment.

Patent documentation 3 disclosed technology are a kind of; Through cylindric stirring rod being arranged at the upstream side of refining agent nozzle and the sidewall of refining agent nozzle side; With cylindric stirring rod molten iron liquid is directed to refining agent nozzle direction, promotes molten iron to improve the technology of reaction efficiency with contacting of refining agent.

In patent documentation 3 disclosed technology, when gathering together at molten iron liquid with because of the fluid that stirs generation, a part of refining agent is involved in molten iron liquid for quilt but is flow to downstream, might increase the dosage of the refining agent that has nothing to do with reaction.

Patent documentation 4 be a kind of through blast furnace pour into that stream force to stir molten iron and refining agent involves in molten iron with refining agent, come molten iron is carried out the purified method of refining.

Shown in patent documentation 4, just refining agent (sweetening agent) is involved in for the method in the molten iron through stirring molten iron, a part of refining agent might not involved in the molten iron and is run off, and will increase sometimes and the irrelevant refining agent of reaction, causes reaction efficiency not good.Particularly shown in patent documentation 4; Owing to when desulfurization is handled, produce slag; This slag is infiltrated hot-metal ladle and carriage (hot metal transfer ladle) or the casting ladle of transferring iron melt etc., and operation slagging-off below might all produce loss aspect heating power and time.In addition, in patent documentation 4, owing to stir molten iron position, thereby the molten iron that is stirred just is equivalent to the constant refractory body, like this, just has the problem of local loss refractory body.

Patent documentation 5 is to carry out the method that desulfurization is handled through the molten iron from blast furnace casting is added sweetening agent.In the method for carrying out this desulfurization processing, after the molten iron in the molten iron flow path has been added sweetening agent, make the molten iron that is added with sweetening agent flow down (falling) fast via inclined wall, carry out desulfurization.

Patent documentation 6 is the same with patent documentation 5, is to carry out the method that desulfurization is handled through the molten iron from blast furnace casting is added sweetening agent.In the method for carrying out this desulfurization processing; Through making from the effusive molten iron mobile of blast furnace molten iron stream separated into two parts; After molten iron in the molten iron flow path of side's side (upstream side) added sweetening agent; Make the molten iron that is added with sweetening agent drop on the molten iron stream of the opposing party's side (downstream side), carry out desulfurization.And with regard to the desulfurization Fang Eryan in the patent documentation 6, when molten iron falls into the molten iron stream of downstream side, through to this molten iron jet compression gas, so that unreacted sweetening agent is blown to the center of stirring stream.

Shown in patent documentation 5 and patent documentation 6, just the molten iron that is added with sweetening agent falls so that sweetening agent involves in this method in the molten iron through in molten iron, adding sweetening agent, making, and the whipping force to molten iron is not very abundant sometimes, and reaction efficiency is not good sometimes.In addition,, and unexposedly how to make conditions such as molten iron falls, in fact implement, the fully situation of desulfurization is also arranged at patent documentation 5 and patent documentation 6.

Patent documentation 7 discloses a kind of pretreatment unit longitudinally that the spray gun of refining agent (treatment agent) injection usefulness is arranged at stream from the top of blast furnace tapping floor.In this pretreatment unit; Through or with the spray gun that refining agent sprays usefulness invade molten iron with refining agent in carrier gas is ejected into molten iron; The spray gun that perhaps makes refining agent spray usefulness is positioned at the top of molten iron refining agent is sprayed with carrier gas, carries out refining treatment.In addition, in this pretreatment unit, Yi Bian the spray gun of refining agent injection usefulness is moved, Yi Bian refining agent perhaps is ejected into molten iron or spirt molten iron.

Shown in patent documentation 7, move with spray gun through refining agent is sprayed, can prevent because of the refractory body that blows into the blast furnace tapping floor that refining agent causes in partial loss.

But, with regard to the pretreatment unit shown in the patent documentation 7,, refining agent is sprayed is not stipulated completely that with the moving range of spray gun with regard to this technology, practical situation are to have reduced reaction efficiency though can prevent the loss of refractory body.

Patent documentation 8 is a kind ofly through the downstream side at the scum dredger (skimmer) of blast furnace tapping floor the pretreatment reaction groove to be set, and the molten iron in this pretreatment tank is added sweetening agent, carries out the method that the desulfurization of molten iron is handled.In the method for carrying out this desulfurization processing; Make the downstream side dipping of spray gun (injection lance) towards the molten iron flow direction; Sweetening agent is sprayed from this spray gun with carrier gas,, carry out desulfurization Yi Bian spray gun is moved at the width and the molten iron flow direction of pretreatment reaction groove.

Patent documentation 8 is the same with patent documentation 7 owing to when molten iron is carried out refining, spray gun is moved, though thereby can prevent the partial loss of refractory body, the moving range of spraying is not stipulated completely, the same with patent documentation 7, make the reaction efficiency reduction sometimes.

In addition, with regard to patent documentation 7 and patent documentation 8, be a kind of for molten iron is carried out refining and uses spray gun that refining agent is ejected into the spray regime in the molten iron, and this mode reaction efficiency is low sometimes.

Patent documentation 1: special disclosing clear 45-31053 number

Patent documentation 2: the spy opens clear 54-137420 number

Patent documentation 3: the spy opens clear 62-202011 communique

Patent documentation 4: the spy opens clear 63-105914 number

Patent documentation 5: the spy opens flat 02-250912 number

Patent documentation 6: special public clear 50-33010 number

Patent documentation 7: the spy opens clear 63-317611 number

Patent documentation 8: the spy opens flat 04-052205 number

Summary of the invention

In view of the above problems, the objective of the invention is to, a kind of continuous refining method is provided, can improve refining efficiency, and not only zero deflection but also stably carry out desiliconization and desulfurization.

In addition, the present invention also aims to, a kind of blast furnace tapping floor equipment is provided,, can improve the efficient of refining treatment such as desulfurization processing and desiliconization processing through refining agent is positively involved in the molten iron.

In addition, the present invention also aims to, a kind of continuous refining method and blast furnace tapping floor equipment of blast furnace tapping floor is provided, when carrying out refining treatment, can prevent the partial loss of refractory body, can improve the efficient of refining treatment simultaneously.

In addition, the present invention also aims to, a kind of continuous refining method of blast furnace tapping floor is provided,, can obtain high reaction efficiency through the refining agent that is added is positively involved in the molten iron.

To achieve these goals, first aspect of the present invention provides a kind of continuous refining method, rotates through adding refining agent in the mobile molten iron in the molten iron stream at the blast furnace tapping floor and impeller being invaded in the molten iron; Thereby molten iron is mixed with refining agent; Come refining molten iron continuously thus, wherein

The blade of invading the said impeller that also rotates in the said molten iron is decided to be 3～6, and makes this blade satisfy formula (1), formula (2), and, with the mode that satisfies formula (3), formula (4) this impeller is invaded in molten iron,

b0≥b1…(1)

0.2≤d/D≤0.8…(2)

0＜h1/Z≤0.4…(3)

0＜h2/Z≤0.4…(4)

Wherein,

B0: the height of the base portion of blade (m)

B1: the height of the leading section of blade (m)

D: the width of blade (m)

D: the maximum width of molten iron stream (m)

Z: the full depth of mobile molten iron (m) in the molten iron stream

H1: from the distance (m) of upper end to the molten iron upper surface of blade base

H2: from the distance (m) in the deep of the bottom of lower end to the molten iron stream of blade base.

The inventor, and carries out when desiliconization processing or desulfurization are handled, improving refining efficiency and does not have deviation and stable desiliconization or the method for desulfurization are verified through mobile molten iron the molten iron stream that in gamut, is not stirred in the blast furnace tapping floor from various angles.

Particularly; Make the number of blade and the different a plurality of impellers of width of blade of impeller; Use this impeller; Change on one side impeller with respect to the dipping mated condition of molten iron (from the distance h 1 of upper end to the molten iron upper surface of blade base, from the innermost distance h 2 of the bottom of lower end to the molten iron stream of blade base), carried out on one side that desiliconization is handled or the experiment of desulfurization processing.

Result of experiment is found; Blade through the above-mentioned impeller of invading above-mentioned molten iron and rotating is set to 3～6, and with the mode that satisfies formula (1), formula (2) this blade is set, simultaneously; Make this impeller invade molten iron with the mode that satisfies formula (3), formula (4); Even in the molten iron stream, continuously under the mobile situation, also can improve refining efficiency, and not only zero deflection but also stably carry out desiliconization or desulfurization.

Preferred said refining agent is a desiliconization agent, and said refining is said molten iron to be mixed and the desiliconization of removing the element silicon in the molten iron is continuously handled with said desiliconization agent.

Second aspect present invention provides a kind of continuous refining method of blast furnace tapping floor; Rotate through impeller being invaded in the molten iron, thereby molten iron is mixed with refining agent, come refining molten iron continuously thus interpolation refining agent in the mobile molten iron in the molten iron stream of blast furnace tapping floor; Wherein

Configuration is used to step that molten iron is fallen in said molten iron stream; Downstream side at this step disposes said impeller; The point of addition that adds said refining agent is arranged at the downstream side of this impeller; Downstream side at point of addition is provided with the slag that generates behind the molten iron is stirred in removal by said impeller position

With the mode that satisfies formula (11) width of said impeller is set,

Mode to satisfy formula (12)～formula (14) is set said step,

Set the point of addition of said interpolation refining agent with the mode that satisfies formula (15),

Set the position of said removal slag with the mode that satisfies formula (16),

Come on this basis molten iron is carried out refining,

0.3≤d/D＜1…(11)

0＜L/D≤1.5…(12)

H/Z≥1…(13)

θ≥30…(14)

0＜M/D≤0.8…(15)

1.2≤R/D≤5…(16)

Wherein,

D: the width of impeller (m)

D: the maximum width of molten iron stream (m)

L: from the distance (m) of step to impeller

H: the height of step (m)

Z: the degree of depth of molten iron (m)

θ: the gradient of step (deg)

M: from the distance (m) of rotation axis center to the point of addition of impeller

R: from the distance (m) of rotation axis center to the position of removing slag of impeller.

The present inventor has verified in all its bearings through refining agent is positively involved in the molten iron, has improved the method for the efficient of refining treatment.

Particularly; Be exactly that the present inventor is conceived to utilize impeller stirring molten iron this point and utilization to fall stirring molten iron this point; Change height, the step of the width of impeller, the position that makes the step that molten iron falls, step the gradient (angle of inclination), add the point of addition of refining agent, the position of the removal slag relative with the rotating shaft position of impeller, carried out the experiment that desiliconization is handled or desulfurization is handled.

Result of experiment is found; So long as the width of above-mentioned impeller satisfies formula (11); Step satisfies formula (12)～formula (14), and the point of addition that adds refining agent satisfies formula (15), takes out the position of the slag in the molten iron stream and satisfies formula (16); Just can refining agent positively be involved in the molten iron, and then improve the efficient of refining treatment.

On the basis of preferably setting with the mode that satisfies following formula (11a)～(16a), molten iron is carried out refining,

0.55≤d/D＜1…(11a)

0＜L/D≤1.0…(12a)

H/Z≥2.2…(13a)

θ≥45…(14a)

0＜M/D≤0.66…(15a)

1.2≤R/D≤4.4…(16a)。

Third aspect present invention provides a kind of blast furnace tapping floor equipment; It possesses: make molten iron mobile molten iron stream from blast furnace casting, in this molten iron stream, add the mobile molten iron refining agent adding set, have the impeller that stirs molten iron whipping appts, will stir the ash pit that the slag on the molten iron that the back produced is discharged to the outside by said whipping appts; Wherein

Be provided with at the upstream side of said molten iron stream and be used to stage portion that molten iron is fallen; The mode that is positioned at the downstream side of this stage portion with said impeller is provided with whipping appts; Downstream side at this impeller is provided with adding set, at the downstream side of this adding set said ash pit is set

Set the width of said impeller with the mode that satisfies formula (11),

Mode to satisfy formula (12)～formula (14) is set said stage portion,

Set the position of said adding set with the mode that satisfies formula (15),

Set the position of said ash pit with the mode that satisfies formula (16),

0.3≤d/D＜1…(11)

0＜L/D≤1.5…(12)

H/Z≥1…(13)

θ≥30…(14)

0＜M/D≤0.8…(15)

1.2≤R/D≤5…(16)

Wherein,

D: the width of impeller (m)

D: the maximum width of molten iron stream (m)

L: from the distance (m) of stage portion to impeller

H: the height of stage portion (m)

Z: the degree of depth of molten iron (m)

θ: the gradient of stage portion (deg)

M: from the distance (m) of rotation axis center to the adding set of impeller

R: from the distance (m) of rotation axis center to the ash pit of impeller.

The present inventor has verified in all its bearings through refining agent is positively involved in the molten iron, has improved the method for the efficient of refining treatment.

Particularly; Be exactly that the present inventor is conceived to utilize whipping appts impeller stirring molten iron this point and utilization to fall stirring molten iron this point; Change height, the stage portion of the width of the impeller be arranged at whipping appts, the position that makes the stage portion that molten iron falls, stage portion the gradient (angle of inclination), add the point of addition of refining agent, the position of the ash pit of removing slag relative with the rotating shaft position of impeller, carried out the experiment that desiliconization is handled or desulfurization is handled.

Result of experiment is found; So long as the width of above-mentioned impeller satisfies formula (11); Stage portion satisfies formula (12)～formula (14), and formula (15) is satisfied in the position of above-mentioned adding set, and formula (16) is satisfied in the position of above-mentioned ash pit; Just can refining agent positively be involved in the molten iron, and then improve the efficient of refining treatment.

Preferably on the basis of setting with the mode that satisfies following formula (11a)～(16a), molten iron is carried out refining,

0.55≤d/D＜1…(11a)

0＜L/D≤1.0…(12a)

H/Z≥2.2…(13a)

θ≥45…(14a)

0＜M/D≤0.66…(15a)

1.2≤R/D≤4.4…(16a)。

Fourth aspect present invention provides a kind of continuous refining method of blast furnace tapping floor; Through interpolation refining agent in the mobile molten iron in molten iron stream impeller is invaded in the molten iron and rotate, thereby molten iron is mixed with refining agent, come refining molten iron continuously thus at the blast furnace tapping floor; Wherein

Stage portion is set in said molten iron stream molten iron is fallen from this stage portion, dispose said impeller at the downstream side of said stage portion molten iron is stirred,

When the said molten iron of refining, impeller is moved in the scope of following formula along the molten iron stream,

0＜L/D≤1.5…(12)

Wherein,

D: the maximum width of molten iron stream (m)

L: from the distance (m) of stage portion to impeller.

The present inventor has verified through refining agent is positively involved in the molten iron in all its bearings, improves the efficient of refining treatment, prevents to be arranged at the method for the local loss of refractory body of molten iron stream simultaneously.

Particularly, be exactly that the present inventor is conceived to stir molten iron and stir the two stirring action of molten iron by falling through utilizing by impeller, make refining agent positively involve in this point in the molten iron.So the configuration stage portion makes molten iron fall from this stage portion in the molten iron stream, disposes above-mentioned impeller at the downstream side of above-mentioned stage portion molten iron is stirred.

In addition, the present inventor is in order effectively to utilize both stirrings to greatest extent, and considers that the position relation of impeller and step is most important, and the efficient of the refining treatment the when position that makes impeller and stage portion is changed is tested.Result of experiment is found, satisfies above-mentioned formula through the position relation that makes impeller and stage portion, has improved refining efficiency.

Moreover, consider in order to prevent the local loss of refractory body, and when carrying out refining treatment, not the impeller that molten iron is stirred is stayed in the fixed position but to make impeller whether effectively move in the scope of upstream side and downstream side.

Therefore, the present inventor is in order not only to improve the efficient of refining treatment but also prevent the partial loss of refractory body, and impeller (is moved in the scope of 0＜L/D≤1.5=satisfying above-mentioned formula.

Be used to implement the blast furnace tapping floor equipment of aforesaid method; Be a kind of following equipment; It possesses: make molten iron mobile molten iron stream from blast furnace casting, to mobile molten iron in this molten iron stream, add refining agent adding set, have the whipping appts of the impeller that stirs molten iron, wherein

Be provided with at the upstream side of said molten iron stream and be used to stage portion that molten iron is fallen, whipping appts is set so that said impeller is positioned at the mode of the downstream side of this stage portion,

Said whipping appts can make impeller move in the scope of following formula along the molten iron stream,

0＜L/D≤1.5…(12)

Wherein,

D: the maximum width of molten iron stream (m)

L: from the distance (m) of stage portion to impeller.

Like this, move in the scope that satisfies above-mentioned formula, can prevent the partial loss of refractory body, can improve the efficient of refining treatment simultaneously through making impeller.

The 5th form of the present invention is a kind of continuous refining method of blast furnace tapping floor, in the iron notch of blast furnace tapping floor, adds refining agent, thereby utilizes impeller to make molten iron and said refining agent mix the said molten iron of refining continuously, it is characterized in that,

The eddy current that produces at said impeller the length direction component of said iron notch and said molten iron flow direction quadrature or with the opposite zone of said molten iron flow direction, any position interpolation refining agent at least in following position,

(i) satisfy the position of formula (15b) at the upstream side of said impeller

(ii) satisfy the position of formula (15) at the downstream side of said impeller

0＜M/D≤0.5…(15b)

0＜M/D≤0.8…(15)

Wherein,

D: the maximum width of molten iron stream (m)

M: from the distance (m) of center of rotation to the point of addition of impeller.

Continuous refining method according to based on viewpoint of the present invention has improved refining efficiency, but zero deflection is stably carried out desiliconization or desulfurization again simultaneously.

According to continuous refining method,, can improve the efficient of refining treatment such as desulfurization processing and desiliconization processing through refining agent is positively involved in the molten iron based on viewpoint of the present invention.

According to continuous refining equipment based on viewpoint of the present invention, can prevent the partial loss of refractory body, can improve the efficient of refining treatment simultaneously.

According to continuous refining method,, can obtain high reaction efficiency through the refining agent that is added is positively involved in the molten iron based on viewpoint of the present invention.

Description of drawings

Fig. 1 is the approximate vertical view of the blast furnace tapping floor in the blast-furnace equipment of first embodiment of the invention;

Fig. 2 is the summary side elevation of blast furnace tapping floor;

Fig. 3 is the stereographic map that molten iron is supplied with stream and impeller;

Fig. 4 is the dipping figure of the impregnation state of expression impeller;

Fig. 5 is the summary shape figure of the blade of impeller;

Fig. 6 is the layout diagram of explanation blade arrangement;

Fig. 7 has carried out the figure that concludes to the relation between blade sheet number and the desiliconization efficient;

Fig. 8 has carried out the figure that concludes to the relation between d/D and the desiliconization efficient;

Fig. 9 has carried out the figure that concludes to the relation between h1/Z and the desiliconization efficient;

Figure 10 has carried out the figure that concludes to the relation between h2/Z and the desiliconization efficient;

Figure 11 is the summary section when impeller is invaded other iron notch;

Figure 12 is the approximate vertical view of the blast furnace tapping floor equipment of second embodiment of the present invention;

Figure 13 is the summary section of blast furnace tapping floor equipment;

Figure 14 is the vertical view of the size in the explanation blast furnace tapping floor equipment;

Figure 15 is the vertical view of the size in the explanation blast furnace tapping floor equipment;

Figure 16 is the summary section when impeller is invaded iron notch;

Figure 17 has carried out the figure that concludes to the relation between d/D and the desiliconization efficient;

Figure 18 has carried out the figure that concludes to the relation between L/D and the desiliconization efficient;

Figure 19 has carried out the figure that concludes to the relation between H/Z and the desiliconization efficient;

Figure 20 has carried out the figure that concludes to the relation between the gradient of stage portion and the desiliconization efficient;

Figure 21 has carried out the figure that concludes to the relation between M/D and the desiliconization efficient;

Figure 22 has carried out the figure that concludes to the relation between R/D and the desiliconization efficient;

Figure 23 makes iron notch round-shaped and impeller and preparation is thrown in the layout diagram that impeller is disposed at circular portion;

Figure 24 is the outline elevation of whipping appts and adding set;

Figure 25 is the summary side elevation of whipping appts;

Figure 26 is the summary section when impeller is invaded other iron notch;

Figure 27 is the slightly sectional view of joining when impeller is invaded the iron notch of third embodiment of the invention;

Figure 28 is impeller state graph to the fusing damage of refractory body when removable and when not removable;

Figure 29 is the outline elevation of whipping appts and adding set;

Figure 30 is the summary side elevation of whipping appts;

Figure 31 is the elevation cross-sectional view of a refining unit of four embodiment of the invention;

Figure 32 is the plane sketch chart that is provided with the blast furnace tapping floor of a refining unit;

Figure 33 is the figure of the point of addition of expression refining agent;

Figure 34 is the point of addition of expression refining agent and the figure of the relation between the desulfuration efficiency;

Figure 35 is the molten iron mobile figure that expresses in the metal trough.

Figure 36 is the figure that the relation between the point of addition of eddy current and corrigent refining agent is stirred in expression;

Nomenclature

1: the blast furnace tapping floor

2: blast furnace

4: iron notch

5: ash pit

8: stage portion

10: impeller

11: whipping appts

12: adding set

16: blade

Embodiment

1, first embodiment

Below, first embodiment of the blast-furnace equipment of using continuous refining method of the present invention is described.But continuous refining method of the present invention is not only to be suitable for this equipment.

At first, in following embodiment, explanation be as molten iron being carried out one of purified refining agent and having used the desiliconization of desiliconization agent to handle, also be the same but be to use the situation of sweetening agent.Promptly; The present invention representes; Through refining agent is involved in the molten iron effectively, make the reaction contact area of refining agent and molten iron become the best approach that is used to improve speed of response greatly, handle even handle the same desulfurization with desiliconization; Do not rely on the kind and the composition of refining agent, the refining characteristic is all equally high.

Shown in Fig. 1～3, be provided with blast furnace tapping floor 1 around the blast furnace, this blast furnace tapping floor 1 has to be made from blast furnace 2 effusive molten iron mobile iron notch 4 (molten iron stream).

Branch shape becomes at the position midway of above-mentioned iron notch 4 has ash pit 5, near the downstream of the component of iron notch 4, is provided with so that the slag 6 of molten iron flows to the submerged weir 7 of the mode channeling conduct of ash pit 5.

In addition, at the downstream side of the component of iron notch, be provided with the circular groove 9 of circular shape on the vertical view.Dispose a plurality of impellers 10 at iron notch.Particularly, be exactly both to have disposed the impeller 10a (agitating vane) that team's mobile molten iron in circular groove 9 stirs, between above-mentioned component and circular groove 9, dispose other impeller 10a again.The adding set 12 that nearby is provided with interpolation refining agent 22 at impeller 10a or impeller 10b.

Therefore, just form from blast furnace 2 effusive molten iron iron notch 4 from the upper reaches flow further downstream, the slag 6 of molten iron upper surface is by the submerged weir interception and flow to ash pit 5, molten iron self is to circular groove 9 diffluences simultaneously.And, through adding refining agent 22 to molten iron, the impeller 10a or the impeller 10b that invade molten iron are rotated with adding set 12, can carry out desiliconization continuously to the mobile molten iron and handle.

Sidewall 21 as shown in Figure 4, that iron notch 4 has diapire 20 and upwards holds up from this diapire is made sidewall 21 the cross section trapezium-shaped that outwards shifts gradually along with making progress from the both end sides of diapire 20.Diapire 20 and sidewall 21 form through pouring into a mould unshaped refractory body.

Then, specify the structure of impeller with continuous refining method.

Like Fig. 3, shown in 4, impeller 10a or impeller 10b are made up of refractory body, have tubular or bar-shaped rotation axis 15 and a plurality of blades 16 that are arranged at the front end of rotation axis 15.Each blade 16 is front end outstanding essentially rectangular shapes of direction outside diameter of rotation moving axis 15.The height b0 of the base portion of each blade 16 (with the connection section of rotation axis 15) sets with the big mode of height b1 than the leading section (tuck leading section) of blade 10.

That is, set height b0, the b1 of each blade 16 of blade 10a or blade 10b with the mode that satisfies formula (1).

b0≥b1…(1)

In other words, be exactly shown in Fig. 5 (a)～(c), so that the longitudinal wall 16 of blade 16 ' " angulation θ is the mode more than 90 °, constitutes the blade 16 of blade 10a or blade 10b with the cross wall 16 of blade 16.As shown in Figure 5, the shape of the blade part 16 of blade 10a or blade 10b sees it can is square shape on vertical view, also can be trapezium-shaped, can also be circular shape (chamfering of leading section).

The number of blade of blade 10a or blade 10b is set at 3～6.Particularly, be exactly shown in Fig. 1～5 and Fig. 6 (a), at this embodiment, the sheet number of blade is set at four.Each blade is installed on rotation axis 15 according to its sheet number according to the angles with respect to rotation axis 15 equalizations.When the sheet number of blade 16 is four, so that the arrangement angles between each blade 16 roughly becomes 90 ° mode that each blade 16 is installed on rotation axis 15.

In addition, shown in Fig. 6 (b), when the sheet number of blade 16 is three, so that the arrangement angles between each blade 16 roughly becomes 120 ° mode that each blade 16 is installed on rotation axis 15.

Shown in Fig. 6 (c), when the sheet number of blade 16 is six, so that the arrangement angles between each blade 16 roughly becomes 60 ° mode that each blade 16 is installed on rotation axis 15.

In addition; As shown in Figure 4; Be conceived to two the wideest blades 16 of width of blade 16, the value that each outstanding length (from the length of the front end of base portion to the blade 16 of blade 16) is summed up, in other words; To set the width d of this blade 16 with the mode that satisfies formula (2) as the outstanding length d 1 of a blade 16 of benchmark with when the outstanding length d 2 of this blade 16 another blade 16 is farthest summed up exactly.

0.2≤d/D≤0.8…(2)

Wherein, D is the maximum width (m) of molten iron stream.

Particularly, be exactly shown in Fig. 6 (a), when the sheet number of blade was six, the sum total of the outstanding length d 2 of the outstanding length d 1 of the first blade 16a and the second blade 16c was exactly the width d of blade 16.

Shown in Fig. 6 (b), when the sheet number of blade was three, the sum total of the outstanding length d 2 of the outstanding length d 1 of the first blade 16a and the second blade 16c was exactly the width d of blade 16.

Shown in Fig. 6 (c), when the sheet number of blade 16 was six, for example the sum total of the outstanding length d 2 of the outstanding length d 1 of the first blade 16a and the second blade 16c was exactly the width d of blade 16.So, just can change the width d of the blade 16 of impeller 10a or impeller 10b according to the allocation position of impeller 10.

The maximum width D of the molten iron stream in the formula (2) when molten iron is flowed through iron notch 4, is the maximum width of this iron notch 4 of the contacted part of molten iron and iron notch 4 (sidewall of iron notch 4).In other words, exactly when molten iron is flowed through iron notch 4, the maximum width D of molten iron stream is the maximum width of mobile molten iron in iron notch 4.As shown in Figure 4, when the shape of iron notch 4 when sectional view is seen as trapezium-shaped, the liquid level width of mobile molten iron is exactly the maximum width D of molten iron stream in iron notch 4.

In addition; In formula (2); When adopting the maximum width D of molten iron stream,, adopt near the position of the position (mixing position) that makes this impeller 10b dipping with respect to the straight line portion impeller 10b that is disposed at iron notch 4; Relative with the straight line portion impeller 10a that is disposed at iron notch 4, employing makes near the position of the position (mixing position) of this impeller 10a dipping.

Like this, can carry out continuous desiliconizing effectively handles.Continuous refining method is described below.

At first, when the iron notch that makes molten iron from blast furnace 2 flows to iron notch 4, use adding set 12 that refining agent is added at iron notch 4 mobile molten iron.At this moment, make the impeller 10a of above-mentioned formation, 10b invade molten iron and rotation, molten iron and refining agent are mixed with the mode that satisfies formula (3), formula (4).

0＜h1/Z≤0.4…(3)

0＜h2/Z≤0.4…(4)

Wherein,

Z: the full depth of mobile molten iron (m) in the molten iron stream

H1: from the distance (m) of upper end to the molten iron upper surface of blade base

H2: from the innermost distance (m) of the bottom of lower end to the molten iron stream of blade base.

In addition, when making impeller invade molten iron, establish the relational expression that satisfies h1/Z+h2/Z+b0/Z=1.0, set the height b1 of blade 16 with the mode that satisfies this formula and formula (3), formula (4).

The molten iron of having accomplished the desiliconization processing flows to downstream and is put into the hot-metal ladle and carriage (mixer type iron ladle car) that transports molten iron.

Like this, can improve desiliconization efficient, simultaneously not only zero deflection but also stably carry out desiliconization.

Embodiment 1

Below; The sheet number that illustrates blade 16 is 3～6 and makes impeller 10 and use this impeller 10 to carry out the embodiment that desiliconization handles and make and do not satisfy the impeller 10 of formula (1), (2) and use this impeller 10 to carry out the comparative example that desiliconization is handled with the mode that satisfies formula (1), (2).And implementation condition such as table 1.

Table 1

Implementation condition

Chemical reaction takes place and according to Si+2O=SiO in the oxygen element (O) in the element silicon in the molten iron (Si) and the desiliconization agent 11 ₂This chemical equation forms SiO ₂And from molten iron, be removed.Whether the desiliconization agent 11 that adds molten iron to as expression has helped the index of desilication reaction effectively, has used suc as formula the desiliconization efficient shown in (5).

Desiliconization efficient representes to be applied to respect to the oxygen element in the desiliconization agent 11 ratio of oxygen element of the oxidation of the Si in the molten iron.

Mathematical expression 1

${\mathrm{\&eta;}}_{\mathrm{<figure-callout\; id="2"\; label="o"\; filenames="HDA00001778452400011.png,HDA00001778452400061.png"\; state="\{\{state\}\}">o</figure-callout>}2}=\frac{\mathrm{\&Delta;}\left[\mathrm{Si}\right]\&times;\&times;1000}{W_F\&times;C_n}\&times;100(\%),\mathrm{\&Delta;}\left[\mathrm{Si}\right]={\left[\mathrm{Si}\right]}_i-{\left[\mathrm{Si}\right]}_f...\left(5\right)$

Wherein, 32:O ₂Molecular weight (g/mol), 28:Si molecular weight (g/mol),

[Si] _r: the Si concentration (mass%) before the desiliconization in the molten iron,

[Si] _f: the Si concentration (mass%) after the desiliconization in the molten iron,

W _F: desiliconization agent injected volume (kg/ molten iron ton),

Co: be contained in desiliconization agent O concentration (mass%).

Table 2, Fig. 7～Figure 10 are the charts of having concluded the desiliconization efficient when using a plurality of impellers 10 to carry out the desiliconization processing.Below, explain like table 2, Fig. 7～result shown in Figure 10.

And on mixing position one hurdle of table 2, so-called " groove " expression is the straight line portion of iron notch 4, and so-called " circular reactive tank " expression is a circular groove 9.

In the operation of reality; Receiving the maximum unit consumption of the desiliconization agent that the restriction of the input speed of molten iron velocity of flow and desiliconization agent can throw in is 60kg/ton; Under the situation of desiliconization efficient less than 60%; Maximum silicon concentration when tapping a blast furnace is during up to about 0.7mass%, and the silicon after more than half processing surpasses 0.25mass%.So, must guarantee that desiliconization efficient is more than 60%.

(about the blade sheet number of impeller)

Like table 2 and shown in Figure 7,, will cause desiliconization efficient less than 60% (comparative example 12,13) if the sheet number of blade 16 arrives three of less thaies less.Think that this is because the sheet number of blade 16 is few thereby when impeller 10 is rotated, will make desiliconization agent 11 involved in the reason of ability (stirring capacity) reduction of molten iron.

On the other hand, if the sheet number of blade 16 surpasses six, will cause desiliconization efficient less than 60% (comparative example 14).Think that reason wherein is because the sheet number of blade 16 is too much, thereby when impeller 10 is rotated, cause the slag 6 that produces because of desilication reaction to be easy to stick to blade 16, slag 6 is bonded on this blade 16 is solidified into bulk.Because the adhesion of the slag of bulk, even thereby wheel rotor 10 also will weaken stirring capacity, therefore make the reaction efficiency variation.

So the sheet number of blade 16 can improve stirring capacity, preferably be difficult to simultaneously to adhere to 3～6 of slag, like this, desiliconization efficient is reached more than 60%.

(about the relation between the maximum width of the width of blade and molten iron stream)

Like table 2 and shown in Figure 8, the relation between the maximum width of the width of blade 16 and molten iron stream is d/D＜0.2 o'clock, and desiliconization efficient does not reach 60% (comparative example 19,20).

Think; Reason wherein is; This means and make impeller when dipping too little with respect to the dipping width (width d) of the maximum width impeller 10 of molten iron stream; Even wheel rotor 10 also can only apply whipping force near the part of mobile impeller 10 molten iron, and to not applying enough whipping forces away from impeller 10 mobile molten iron.

That is owing to pass through from place away from the blade 16 of impeller 10 at the molten iron of the sidewall 4a side flow that forms iron notch 4, therefore almost stir less than.The molten iron that does not obtain in enough stirrings directly can not mix with desiliconization agent 11 from upstream flow downstream fully.

On the other hand, be d/D＞0.8 o'clock in the relation between the maximum width of the width of blade 16 and molten iron stream, desiliconization efficient does not reach 60% (comparative example 15,20).

This means and make impeller when dipping excessive with respect to the dipping width (width d) of the maximum width impeller 10 of molten iron stream; Even wheel rotor 10; Can not be used for desiliconization agent 11 is involved in the eddy current in this molten iron in the generation of the surface of molten iron, make the reaction efficiency variation on the contrary.

So; Relation between the maximum width of the width of blade 16 and molten iron stream; Preferably neither excessive not too little again with respect to the width d of the diameter of molten iron stream or width leaves 16 suc as formula the relation shown in (2), like this, desiliconization efficient is reached more than 60%.

(about the full depth of molten iron and from the distance of upper end to the molten iron upper surface of the base portion of blade)

Like table 2 and shown in Figure 9; When the base portion upper end of blade 16 forms a face with the molten iron upper surface; That is, the full depth of molten iron and when being h1/Z=0 from the relation between the distance of upper end to the molten iron upper surface of the base portion of blade 16, desiliconization efficient will not reach 60% (comparative example 14,15,21).

Its reason is thought, even wheel rotor 10, also just at the upper surface (liquid level) of molten iron, promptly just rotate at the interface of desiliconization agent 11 and molten iron liquid level the upper end of the base portion of blade 16, can not desiliconization agent 11 be involved in molten iron fully.

On the other hand, be h1/Z＞0.4 o'clock in the full depth of molten iron with from base portion upper end to the relation between the distance of molten iron upper surface of blade 16, desiliconization efficient will not reach 60% (comparative example 20).

Think that reason wherein is, make wheel rotation, also can only apply whipping force, and can not apply whipping force mobile molten iron above blade 16 near the part of mobile impeller 10 molten iron even the blade 16 of impeller 10 is sunk to molten iron.Cause that the mobile molten iron can not mix with desiliconization agent 11 directly from upstream flow downstream fully above blade 16.

So, the full depth of molten iron and from the base portion of blade 16 upper end to the relation between the distance of molten iron upper surface preferably impeller 10 with respect to molten iron not only too shallow but also not too dark suc as formula that kind shown in (3), like this, desiliconization efficient is reached more than 60%.

(about the full depth of molten iron with from the relation between the distance in the deep, bottom of base portion lower end to the molten iron stream of blade 16)

Like table 2 and shown in Figure 10, make the contacted state in deep of bottom of lower end and molten iron stream of the front end of blade 16.That is, when h2/Z=0, the deep and the blade 16 of molten iron stream bottom is in contact with one another and makes that to operate self untenable.

On the other hand; Make the blade 10 of impeller 10 leave the deep of molten iron stream bottom; Relation between the distance in the deep of lower end to the molten iron stream bottom of the front end of the joint blade of full depth of molten iron is made h2/Z＞0.4 o'clock, and desiliconization efficient will not reach 60% (comparative example 13,21,22).

Think that reason wherein is because how the blade of impeller 10 16 does not enter in the molten iron, thereby can only apply whipping force near the part of mobile impeller 10 molten iron, and can not apply whipping force to mobile molten iron below blade 16.Cause that the mobile molten iron can not mix with desiliconization agent 11 directly from upstream flow downstream fully below blade 16.

So; The full depth of molten iron and from the relation between the distance in the deep of lower end to the molten iron stream bottom of the front end of blade 16; Preferably impeller 10 with respect to molten iron not only too shallow but also not too dark suc as formula that kind shown in (4), like this, desiliconization efficient is reached more than 60%.

Above; The sheet number of the blade 16 of impeller 10 is being made 3～6, when making it satisfy formula (1), formula (2) and carry out desiliconization and handle simultaneously, through invading in the molten iron with the mode that satisfies formula (3), formula (4) and rotating; Can improve desiliconization efficient, simultaneously both zero deflection by stably carrying out desiliconization.

Embodiment 2

At this embodiment, explain that handling the same this impeller that uses with desiliconization carries out the desulfurization processing.And implementation condition such as table 3.Table 4 is represented result of implementation in addition.

Table 3

Whether the desiliconization agent (refining agent) that adds molten iron to as expression has helped the index of desulphurization reaction effectively, has used suc as formula the desulfuration efficiency shown in (6).

Mathematical expression 2

${\mathrm{\&eta;}}_S=\frac{\mathrm{\&Delta;}\left[S\right]}{{\left[S\right]}_i}\&times;100\%,\mathrm{\&Delta;}\left[S\right]={\left[S\right]}_i-{\left[S\right]}_f...\left(6\right)$

Wherein,

[S] _r: the S concentration (mass%) before the desiliconization in the molten iron,

[S] _f: the S concentration (mass%) after the desiliconization in the molten iron.

Show with desiliconization handle the same, in the desulfurization processing, as long as satisfy the blade sheet number and the formula of impeller

(1)～(4), just can improve desulfuration efficiency.

Under the situation of desulfuration efficiency less than 50%, because the desulfurization process that also need append sometimes causes production efficiency to reduce and thermodynamic loss, thereby undesirable in operation.Therefore, must guarantee that desulfuration efficiency is more than 50%.

The present invention is not limited only to above-mentioned embodiment.In above-mentioned embodiment, stir molten iron with an impeller 10 and carry out desiliconization or desulfurization processing, but also can or a plurality of impellers 10 be set in circular groove 9 at groove 4 (straight line portion of iron notch 4).

In above-mentioned embodiment; Explained that iron notch 4 is the situation of trapezium-shaped on section, but shown in figure 11, utilize the etch together of flowing with molten iron; Be seen as roughly circular shape on the section or adopt condition no matter iron notch 4 changed into, all without a doubt like publicity of the present invention.

2. second embodiment

Below, the blast furnace tapping floor equipment of second embodiment of the present invention is described.

Like Figure 12, shown in Figure 13, be provided with blast furnace tapping floor 1 around the blast furnace 2, this blast furnace tapping floor 1 has to be made from blast furnace 2 effusive molten iron mobile iron notch 4.

Iron notch 4 is the molten iron streams with hot metal ladle that molten iron is flow to and hot-metal ladle and carriage etc.Molten iron flows from the left side of Figure 12 to the right.Therefore, the left side of Figure 12 is called the upper reaches, the right side of Figure 12 is called downstream.

At the upstream side of iron notch 4, branch is formed with first ash pit 5, is provided with first submerged weir 7 at the downstream side of the tapping point of this first ash pit 5, and this first submerged weir is used for making it flow to first ash pit 5 the slag guiding that swims on the molten iron.So-called submerged weir is a rectangular shape, be leave iron notch 4 through the bottom bottom, top from the outstanding weir of molten iron, the device that interception swims in the slag on the molten iron and molten iron self is passed through from downside.

The downstream side of first submerged weir 7 be provided with from the bottom of iron notch 4 to above outstanding stage portion 8.This stage portion 8 has: from the bottom 4a of the upstream side of iron notch 4 (in other words, exactly near the bottom of first submerged weir 7) roughly meet at right angles the vertical component effect 8a that upwards holds up, from this vertical component effect 8a to the horizontally extending horizontal part 8b of downstream side, from the rake 8c of this horizontal part 8b to the bottom angled of the downstream side of iron notch 4.

Dispose at the downstream side of stage portion 8 and to have through rotating the whipping appts 11 of the impeller 10 that stirs molten iron, dispose the adding set 12 that adds refining agent at the downstream side of this impeller 10.

The downstream side branch of adding set 12 is formed with second ash pit 13, and 13 pairs of slags that carried out stirring with impeller 10 after, generated of this second ash pit carry out deslagging.At the downstream side of the iron notch 4 of the tapping point of second ash pit 13, slag 14 channeling conducts that are provided with generating after having been undertaken by impeller 10 stirring make it flow to second submerged weir 18 of second ash pit 13.

Sidewall 21 shown in figure 16, that iron notch 4 has the diapire 20 that constitutes bottom 4a and bottom 4b, upwards holds up from this diapire 20 is made from the both ends of diapire 20 upwards abducent gradually cross section trapezium-shaped with sidewall 21.Diapire 20 and sidewall 21 form through pouring into a mould unshaped refractory body.

Below, very thin explanation stage portion 8, whipping appts 11, adding set 12, second ash pit 13.

(about whipping appts)

Like Figure 24, shown in Figure 25, the device 11 that reduces by half possesses and has: the impeller 10 that molten iron is stirred, the driving part 30 of this impeller 10 of rotating drive, the lifting device 31 that impeller 10 and driving part 30 are gone up and down.

Driving part 30 has: be used to make drivingmotor 32 that impeller 10 rotates, from i.e. first rotating shaft 33 of the outstanding downwards output shafts of drivingmotor 32, be installed on first gear 34 of the front end of this first rotating shaft 33, with second gear 35 of these first gear, 34 engagements, be arranged at the upper end of this second gear 35 and second rotating shaft 36 that above-below direction is pointed in the axle center.These devices are that drivingmotor 32, first rotating shaft 33 and second rotating shaft 33 are disposed at supporting mass 37.

Second rotating shaft, 36 quilts pair of bearings 38 rotations up and down are supported on the supporting mass 37 freely.Be provided with the connection device 39 that is connected on coaxial with the rotation axis 15 of following impeller 10 and this second rotating shaft 36 in the bottom of second rotating shaft 36.

Lifting unit 31 has pair of hydraulic cylinders (hydro-cylinder of band brake) 40, the axle center court of this hydro-cylinder 40 is disposed at the both sides of supporting mass 37 up and down.

The hydro-cylinder main body 41a of hydro-cylinder 40 is installed in the support 41 that is fixed on the pedal 42.The front end of the bar 40b of hydro-cylinder 40 is connected in supporting mass 37, utilizes the flexible supporting mass 37 that can make of bar to go up and down.

Impeller 10 has perhaps a plurality of blades 16 of the front end of bar-shaped rotation axis 15, setting and rotation axis 15 of tubular.

The rotation axis 15 of impeller 10 is set at the top of iron notch 4 and connects the molten iron stream lid 43 that covers iron notch 4, connects the pedal 42 of the top that is arranged at molten iron tank 43 simultaneously.The upper end of rotation axis 15 is connected in second rotating shaft 36 of driving part 30 through connection device 39.

Each blade of impeller 10 is from the outwards outstanding essentially rectangular shape of the front end radius vector of rotation axis 15.The blade sheet number of impeller 10 is made four.Each blade 16 is installed in rotation axis 15 according to its sheet number with the angles (for example 90 degree) with respect to rotation axis 15 equalizations at interval.

So that the width of impeller 10 satisfies the width that the mode of formula (11) is set this impeller 10,

0.3≤d/D＜1…(11)

Wherein,

D: the width of blade (m)

D: the maximum width of molten iron stream (m).

Shown in Figure 14～16, the width of impeller is that mutual width of opposed each blade 16 (from the outstanding length of rotation axis 15) and rotation axis 15 diameters are added together (d=d1+d2+d3).That is,, the width of blade 16 and the diameter of rotation axis 15 are set so that the width d of impeller satisfies the mode of formula (11).

The maximum width D of molten iron stream is the maximum width of this iron notch 4 of molten iron and the contacted contact part of iron notch 4 (sidewall 21 of iron notch 4) when molten iron is flowed through iron notch.In other words, the maximum width D of molten iron stream in other words, be when molten iron is flowed through iron notch in iron notch 4 maximum width of mobile molten iron.Shown in figure 16, the shape of iron notch 4, when on sectional view, being seen as trapezium-shaped, the liquid level width of mobile molten iron is exactly the maximum width D of molten iron stream in iron notch 4.

And at iron notch 4, preferably adopt the position of the maximum width D of molten iron stream, be the dipping impeller 10 position (mixing position) near.

According to whipping appts 11, through starting drivingmotor 32, can make second rotating shaft, 36 rotating drive, utilize the rotation of second rotation axis 36, the blade 16 of impeller 10 is rotated around the rotation axis 15 of impeller 10.

In addition, supporting mass 37 is gone up and down, changeablely invade the dipping posture of molten iron and make the blade 16 of impeller 10 not invade the posture of keeping out of the way of molten iron for the blade 16 that makes impeller 10 through the lifting unit 31 that utilizes whipping appts 11.

When carrying out desiliconization processing and desulfurization and handling, utilize lifting unit 31 that supporting mass 37 is descended and make after the postures of 16 one-tenths dippings of blade of impeller 10, start drivingmotor 32 and make blade 16 rotations of invading molten iron.

(about stage portion)

To satisfy the mode of formula (12)～(14), set the position of this stage portion 8, the height and the gradient (angle of inclination) of stage portion 8,

0＜L/D≤1.5…(12)

H/Z≥1…(13)

θ≥3θ…(14)

Wherein,

L: from the distance (m) of step to impeller

H: the height of step (m)

Z: the degree of depth of molten iron (m)

θ: the gradient of step (deg).

Like Figure 14, shown in 15,, be horizontal throw from the contacted contact part of rake 8c of molten iron and stage portion 8 to the track K that makes blade 16 rotary types from the distance L of stage portion to impeller.In other words, in other words from the distance L of stage portion to impeller, be horizontal throw from the contacted contact part of rake 8c to the leading section of blade 16 of molten iron and stage portion 8.

The height H of stage portion 8 is the distances from the bottom 4b of the iron notch 4 of the downstream side of stage portion 8 to the horizontal part 8b of stage portion 8.The degree of depth Z of molten iron is the degree of depth of the degree of depth of molten iron of the downstream side of expression stage portion 8, the degree of depth Z of molten iron with respectively tap a blast furnace roughly the same.θ in formula (14) is the gradient of the stage portion 8 relative with the bottom surface of the level of molten iron stream, and is detailed, the acute angle that is become with rake 8c that bottom 4b upwards holds up from the smooth bottom 4d of iron notch 4 exactly.

(about adding set)

Shown in figure 24, adding set 12 has: the hopper 45 of storage refining agent, the refining agent that will discharge from the bottom of hopper 45 carry out the refinement cutting cutting portion 46, carry the preparation of being seen off side (being sometimes referred to as leading section) by the helicoid conveyer 47 of the refining agent of cutting, the refining agent that is arranged at helicoid conveyer to throw in spray gun 17.

Constituting of helicoid conveyer 47; Have along go out the cylindrical shell 48 that flowing molten iron grass 4 extends and in this cylindrical shell 48, be arranged at the axle center of this cylindrical shell 48 coaxial and cylindrical shell 48 in rotation water screw 49 freely; Utilize the rotation of water screw 49, will throw in spray gun 17 conveyings to preparation from the refining agent of cutting portion 46 cuttings by rotating.

Preparation is thrown in spray gun 17, and molten iron stream lid 43 and pedal 42 are pointed to up and down and connected in its axle center.The upper end of preparation input spray gun 17 is connected in the front end of helicoid conveyer 47, and preparation is thrown in the upside of the through molten iron in lower end of spray gun 17.

So that the position that the mode of formula (15) is set this adding set 12 is satisfied in the position of adding set 12,

0＜M/D≤0.8…(15)

Wherein,

M: from the distance (m) of center of rotation to the point of addition of blade.

The position of so-called adding set 12 is central positions that the tubular preparation is thrown in spray gun 17.Suc as formula the M shown in (15), particularly, be exactly the water article distance of throwing in the center (axle center) of spray gun 17 from center (axle center) to the preparation of the rotation axis 15 of impeller 10.That is, set the central position that preparation is thrown in spray gun 17 with the mode that satisfies formula (15).

According to adding set 12, rotate through making helicoid conveyer 45, can refining agent be delivered to preparation and throw in spray gun 17, throwing in spray gun 17 through preparation can make an addition to refining agent in the molten iron continuously.

(about second ash pit)

Set the position of ash pit (second ash pit 13) with the mode that satisfies formula (16),

1.2≤R/D≤5…(16)

Wherein,

R: from the distance (m) of center of rotation to the position of taking out slag of blade.

The position of so-called second ash pit 13, first finger see that on section the city holds the position of sidewall 13a (upper end of sidewall 13a) of second ash pit, 13 downstream sides of shape.Suc as formula the R shown in (16), be horizontal throw to the sidewall 13a (upper end of sidewall 13a) of the downstream side of second ash pit 13 from the rotation axis 15 of impeller 10.

More than with regard to blast furnace tapping floor equipment of the present invention, based on formula (11)～formula (16), set height and the gradient of width, the stage portion 8 of blade 10, the position of adding set 12, the position of second ash pit 13.

According to blast furnace tapping floor device 1, the molten iron from blast furnace 2 comes out flows to downstream side through first submerged weir 7 to stage portion 8, and slag 6 flows to first ash pit 5.And, to stage portion 8 mobile molten iron, just can arrive the rake 8c of stage portion 8 through the horizontal part 8b of stage portion 8, flow to downstream side again along 8c.

The molten iron that arrives rake 8c flows along rake 8c, and at this moment, this molten iron just can fall to the bottom of iron notch 4 4b from stage portion 8 (horizontal part 8b).Molten iron from stage portion 8 falls is stirred through falling from stage portion 8.

The molten iron that falls and be stirred from stage portion 8 arrives impeller 10 and carries out mechanical stirring by this impeller 10, flows to the downstream side that more leans on downstream than impeller 10 again.Refining agent (for example desiliconization agent or sweetening agent) is added near the molten iron that arrives the adding set 12, carries out the desiliconization and the desulfurization of molten iron.

Carried out the molten iron that desiliconization is handled or desulfurization is handled, and flow to downstream side via second submerged weir 18 to stage portion 8, the slag 14 that becomes because of the interpolation of the stirring of impeller 10 or refining agent flows to second ash pit 13.

Embodiment 3

Below, being that example describes in that the position of the position of the height of stage portion position, stage portion and the gradient, adding set, second ash pit has been carried out carrying out desiliconization is handled or desulfurization is handled embodiments of the invention and comparative example on the preset basis based on formula (11)～formula (16).Implementation condition such as table 5.

And iron notch 4 had used the device of regarding trapezium-shaped on the section as before shown in figure 16 tapping a blast furnace.

Table 5

The same with above-mentioned first embodiment, the desiliconization agent that adds molten iron as expression to brings the index of help to the validity of desilication reaction, has used suc as formula the desiliconization efficiency eta shown in (5) _O2, in addition, the sweetening agent that adds molten iron as expression to brings the index of help to the validity of desulphurization reaction, has used suc as formula the desiliconization efficiency eta s shown in (5).

The composition of refining agent also can comprise FeO and/or Fe when desiliconization agent ₂O ₃, when sweetening agent, also can comprise CaO.At this embodiment, used 5FeO-58Fe as desiliconization agent ₂O ₃-21CaO-8SiO ₂(in mass%) used 80CaO-3SiO as sweetening agent ₂-3MgO-6Al ₂O ₃-8M.A1 (in mass%).

With regard to existing refining of stirring with mechanicalness, when making comparisons with identical desiliconization agent unit consumption, desiliconization oxygen efficiency eta _O2Be 30～40%.Given this, at first with desiliconization oxygen efficiency eta _O2For high efficiency more than 50% as benchmark.At this moment, the element silicon when tapping a blast furnace (Si) is 0.38～0.42mass%, and the element silicon (Si) after handling reaches below the 0.25mass%.

Equally, when making comparisons with identical sweetening agent unit consumption, desiliconization efficiency eta s is 30～40%.Given this, at first with desulfuration efficiency η s be high efficiency more than 50% as benchmark.At this moment, the element sulphur when tapping a blast furnace (S) is 0.022～0.023mass%, and the element sulphur (S) after handling reaches below the 0.010mass%.

Through with the desiliconization efficiency eta _O2Benchmark be decided to be more than 50%, can improve the efficient (shorten desulfurization time, improve desulfurization amount) in desulfurization that the subsequent handling of this processing is carried out is handled.

In addition, do not reach at desiliconization efficiency eta s under 50% the situation, the desulfurization process that just need append again, because will cause the reduction and the thermal losses of production efficiency, thereby very undesirable in operation.Therefore, must guarantee that desiliconization efficiency eta s reaches more than 50%.

Moreover, in the operation of reality, be the situation of the high density also higher than 0.50mass% at element silicon (Si) from the effusive molten iron of blast furnace, even in this case, reach 0.25mass% in order to make the element silicon (Si) after the processing, just need be with the desiliconization efficiency eta _O2Benchmark be decided to be more than 60%.

Therefore, preferably under the situation of element silicon (Si) than higher high density of the effusive molten iron of blast furnace, with the desiliconization efficiency eta _O2Benchmark be decided to be more than 60%.

In addition, for contingent to increase sulphur more corresponding in subsequent handling, preferably the benchmark with desiliconization efficiency eta s is decided to be more than 60%.

Table 6, Figure 17～22nd, the desiliconization oxygen efficiency eta when handling to having carried out desiliconization processing or desulfurization _O2, desulfuration efficiency carried out situation about gathering.Below, the result shown in table 6, Figure 17～22 is described.

And so-called straight line stream as shown in table 6, the straight line portion that is illustrated in iron notch shown in figure 12 4 floods impeller 10, the situation of adding refining agent simultaneously.In addition, so-called circular groove as shown in table 6, the circular arc portion that is illustrated in iron notch shown in figure 12 4 floods impeller 10, the situation of adding refining agent simultaneously.Under the situation of circular groove, the maximum width D of molten iron stream is decided to be at circular arc portion.

(about the width of impeller)

With regard to regard to the refining treatment in the blast furnace tapping floor, handle perhaps desulfurization processing owing to carry out desiliconization, thereby must add desiliconization agent or sweetening agent continuously for mobile molten iron in iron notch 4.

In refining treatment, most importantly, also to refining agent positively be involved in molten iron even add refining agent continuously.If maximum width D with respect to the molten iron stream; The width d of impeller 10 is too small; The stirring eddy current also little (whipping force is little) that then causes because of the rotation of impeller 19; Cause a part or most of refining agent not to be involved in the molten iron and be helpless to reaction, directly flow to downstream, consequently reduced reaction efficiency from the upper reaches.

Like table 6 and shown in Figure 17, promptly too small as if the width d of impeller 10 during the d/D less than 0.3 of the ratio of the width d of expression impeller 10 in the width D that arrives most with respect to the maximum width D of molten iron stream with respect to the molten iron stream, will make desiliconization oxygen efficiency eta _O2Do not reach 50% (comparative example 45～47).

On the other hand,, can find out in 0.3≤d/D＜1 o'clock that promptly the width d with respect to the maximum width D impeller 10 of molten iron stream is enough big, will make whipping force big, makes desiliconization oxygen efficiency eta like table 6 and shown in Figure 17 _O2Do not reach 50% (embodiment 1～44).

And under the situation that satisfies formula (11); When

; Utilization is connected in iron notch 4 with respect to the position of the top lower direction of the impeller 10 of iron notch 4 with impeller.That is, be decided to be the width d of impeller 10 and the maximum width D of molten iron stream basic identical sometimes.Under this condition, can not make impeller 10 and iron notch 4 contact wheel rotor 10 self is invalid as operation.In the application of formula (11), naturally not making impeller 10 and iron notch 4 contacted scopes, promptly so that impeller 10 rotating conditions satisfy formula (11).

Shown in figure 17, preferred especially the employing makes desiliconization oxygen efficient reach the condition more than 60%, is about to

0.55≤d/D＜1…(11a)

Condition as the continuous refining method of blast furnace tapping floor.

(about the position of stage portion and stage portion)

Through stage portion being arranged at iron notch 4 molten iron is fallen, utilize this falling to make molten iron that turbulent flow takes place.Utilize the turbulent flow of the molten iron that produces, can reach because of stirring the effect that molten iron involves in refining agent molten iron.

That is, the part of the refining agent that is added at the downstream side of impeller 10 sometimes turns back to the rake 8c of stage portion 8 through the rotation of impeller, and the stirring through stage portion 8 can positively involve in the unreacted refining agent that turns back to stage portion 8 in the molten iron.

In addition, the rake 8c of stage portion 8 works as balk board and in the flowing of molten iron, causes turbulent flow, consequently, can reach the balk board effect that the unreacted refining agent that returns is involved in molten iron.

Like this; Owing to can obtain through the stirring that stage portion 8 causes molten iron is set; Unreacted refining agent is involved in the effect of molten iron, thereby can expect that stirring the two through the mechanicalness with the stirring of stage portion 8 and impeller 10 lumps together, and can positively involve in refining agent in the molten iron.

Moreover in order effectively to utilize both stirrings to greatest extent, most importantly the position of stage portion 8 and impeller 10 concerns.Shown in Figure 15, formula (12), the position relation of stage portion 8 and impeller 10, upwards the holding up and represent of available and molten iron stream to the relative stage portion 8 of width D with ratio (L/D) to the distance of impeller 10.The value of its meaning L/D is big more, then stage portion 8 and impeller 10 farther apart.

Like table 6 and shown in Figure 180, the value of L/D is greater than 1.5 o'clock, desiliconization oxygen efficiency eta _O2To not reach 50% (comparative example 52～57).

Can find out, if the value of L/D surpasses 1.5, then since stage portion 8 and impeller 10 at a distance of far away excessively, thereby most of refining agent can not turn back to stage portion 8 because of the stirring of impeller 10, consequently, reduced desiliconization oxygen efficiency eta _O2That is, the value of L/D is greater than 1.5 situation, in the molten iron of stage portion 8 stirs, will make refining involved in molten iron this to involve in effect very little, the stirring that only is equal in fact with impeller 10 involves in molten iron with refining agent.

And when

; Mean that the two position of stage portion 8 and impeller 10 is identical; And because under this condition; It is invalid can not making impeller 10 self rotate on operating; Thereby except that , be set at 0＜L/D≤1.5.

In addition, shown in figure 18, especially preferably adopt desiliconization oxygen efficiency eta _O2Reach the condition more than 60%, that is, and will

0＜L/D≤1.0…(12a)

Condition as the continuous refining method of blast furnace tapping floor.

(about the height of stage portion)

The height H of stage portion 8 is big more, and then the potential energy that falls of molten iron arrives more.If potential energy greatly then can make the turbulent flow of molten iron big, improve the effect that is involved in to the refining agent of molten iron, improve anticaustic efficient.

Like table 6, shown in Figure 19, as if the degree of depth Z with respect to molten iron, the height H of stage portion 8 is high, and promptly the value of H/Z surpasses 1, then desiliconization oxygen efficiency eta _O2To reach (embodiment 1～44) more than 50%.Like table 6, shown in Figure 19, on the contrary, if low with respect to the height H of the degree of depth Z stage portion 8 of molten iron, i.e. the value less than 1 of H/Z, then desiliconization oxygen efficiency eta _O2To not reach 50% (comparative example 48～50).

The higher limit of preferred H/Z, promptly the height H of stage portion 8 is by equipment restriction decision.For example, shown in figure 19, even the value of H/Z is 4.0, desiliconization oxygen efficiency eta _O2Also will reach more than 50%, the equipment restriction is also no problem.

In addition, shown in figure 19, preferred especially the employing makes desiliconization oxygen efficiency eta _O2Reach the condition more than 60%, that is, and will

H/Z≥2.2…(13a)

Condition as the continuous refining method of blast furnace tapping floor.

(about the gradient of stage portion)

Then the refining agent of molten iron involved in effect bigger (raising reaction efficiency) if the gradient θ of stage portion 8 is bigger.Like table 6, shown in Figure 20, if the gradient θ of stage portion 8 surpasses 30 °, desiliconization oxygen efficiency eta then _O2To reach (embodiment 1～44) more than 50%.Like table 6, shown in Figure 20, on the contrary, if 30 ° of the gradient θ deficiencies of stage portion 8, then desiliconization oxygen efficiency eta _O2To not reach 50% (comparative example 51,52).And the gradient θ of stage portion 8 is made as 90 ° peak, desiliconization oxygen efficiency eta _O2For reaching more than 50%.

In addition, shown in figure 20, preferred especially the employing makes desiliconization oxygen efficiency eta _O2Reach the condition more than 60%, that is, and will

θ≥45…(14a)

Condition as the continuous refining method of blast furnace tapping floor.

(about the position of adding set)

About the position of adding set 12, promptly throw in the position of spray gun 17 about the preparation of adding set 12, with respect to the position that mechanicalness stirs the impeller 10 of molten iron, can consider two schemes of upstream side and downstream side.Be disposed under the situation of upstream side of impeller 10 the preparation of adding set 12 being thrown in spray gun 17, made the dosage increase of refining agent with regard to flowing to downstream side because of nearly all involving in molten iron.

The preparation of adding set 12 is thrown in spray gun 17 set positions under the situation of the downstream side of the position of impeller 10; Be easy to flow to stage portion 8 sides on the contrary through the rotation refining agent of impeller 10 and the flow direction of molten iron; Consequently, with regard to flowing to downstream side the dosage of refining agent is reduced because of nearly all involving in molten iron.

Shown in Fig. 6, table 21, in the M/D of the position of representing the preparation input spray gun 17 relative, as long as desiliconization oxygen efficiency eta just can be guaranteed in M/D≤0.8 with the position of impeller 10 _O2To reach (embodiment 1～44) more than 50%.

Like table 6, shown in Figure 21ly find out, if the value of M/D surpasses 0.8,, thereby can not refining agent be involved in molten iron through stirring because impeller 10 is thrown in spray gun 17 wide aparts with preparation, make desiliconization oxygen efficiency eta _O2Do not reach 50% (comparative example 58～60).

And, mean that then it is the upstream side of impeller 10 that preparation is thrown in the position of spray gun 17, thereby be decided to be 0＜M/D≤0.8 owing to so-called value with M/D is made as below 0.In addition, it is identical with the position of impeller 10 that M/D=0 means that preparation is thrown in spray gun 17, is impossible owing to the position of preparation being thrown in spray gun 17 and impeller 10 fixes on same position physically, thereby removes M/D=0.

Shown in figure 21, preferred especially the employing makes desiliconization oxygen efficiency eta _O2Reach the condition more than 60%, that is, and will

0＜M/D≤0.66…(15a)

Condition as the continuous refining method of blast furnace tapping floor.

(about the position of second ash pit)

Near the position that disposes impeller 10; If second ash pit 13 is set; Then sneaked into molten iron in the slag after stir process 14, caused slag can not separate, might sneak in slag 14 that slag 14 flows to second ash pit 13 under the state of molten iron with molten iron.Consequently, not only cause iron loss, also the characteristic of slag 14 is changed owing to sneaking into molten iron in the slag 14.

If will make slag 14 back in second deslagging 13 that the characteristic of slag 14 has taken place to change put into the slag bag,, and might shorten the life-span of slag bag then owing to the loss (damage) that is arranged at slag bag refractory body is violent.

On the other hand,, be provided with second ash pit 13, slag 14 is solidified in position away from the place that disposes impeller 10.Consequently, the slag 14 in that nearby piling up of impeller 10 has the refining agent that adds because of the initial stage to generate might cause obstacle in operation.

Like table 6, shown in Figure 22, in the R/D of the R of the position of the second relative ash pit 13 of the expression and the position of impeller 10, R/D＞5.0 o'clock, impeller 10 is too far away apart with second ash pit 13.Therefore, though desiliconization oxygen efficiency eta _O2Be more than 50%, but the temperature decline to deslagging (is represented the degree that the temperature of slag reduces with surface temperature slippage Δ Ts) more than 200 ℃ on Figure 22 and table 6 after slag 14 generates, and slag is solidified and be difficult to flow (comparative example 63).

In addition, in R/D＜1.2 o'clock,, sneaked into molten iron in the slag 14 and make, apart though desiliconization oxygen efficiency eta because impeller 10 is too near with second ash pit 13 _O2Be more than 50%, but increased the iron (comparative example 61,62) that is contained in slag 14.

Shown in figure 22, in R/D＜1.2 o'clock, with making the M.Fe that is contained in slag 14 surpass 20% (M.Fe＞20%).In actually operating, the M.Fe that is contained in slag 14 is below 20%, and 200 ℃ of the surface temperature slippage Δ Ts deficiencies of slag 14, just becomes good operational condition.

Shown in figure 22, preferred especially the employing makes desiliconization oxygen efficiency eta _O2Reach the condition more than 60%, that is, and will

1.2≤R/D≤4.4…(16a)

Condition as the continuous refining method of blast furnace tapping floor.

Confirm height and the gradient of position, the stage portion of width, the stage portion of impeller, the position of adding set, the position of second ash pit in advance at blast furnace tapping floor equipment 1 based on formula (11)～(16) above; Through carrying out refining treatment on this basis, can improve the efficient of refining treatment.

Blast furnace tapping floor equipment of the present invention is not only to be confined to above-mentioned embodiment.If refining agent is Powdered, then do not need cutting portion 46.In addition, the delivery section of throwing in spray gun 17 conveying refining agents from hopper 45 to preparation also can not be a helicoid conveyer 47, for example also can be the device with the force feed refining agent of air.

In the superincumbent embodiment; Although clear iron notch 4 is seen as the situation of trapezium-shaped on section; But shown in Figure 26 (b); Though through with the soaking and iron notch 4 be changed on sectional view, see roughly circular shape together of flowing of molten iron, the condition that still adopts publicity of the present invention is all without a doubt.In addition, shown in Figure 26 (a), on sectional view, be seen as the essentially rectangular shape no matter iron notch 4 changes, the condition that still adopts publicity of the present invention all without a doubt.

Promptly; As long as make height and the gradient of position, the stage portion of width, the stage portion of impeller, the position of adding set, the position of second ash pit satisfy formula (11)～(16) and formula (11a)～(16a), just can improve that desulfurization is handled and the efficient of refining treatment such as derailing processing.

3. the 3rd embodiment

Below, the blast furnace tapping floor equipment based on the third embodiment of the invention viewpoint is described.

Because identical shown in Figure 12～14 of the blast furnace tapping floor equipment of the 3rd embodiment and second embodiment, thereby following explained distinct portions.

Shown in figure 27, in the blast furnace tapping floor equipment of the 3rd embodiment, iron notch 4 has: insulation part 60, be disposed at the inboard of this insulation part 60 and the back side portion 61 that constitutes by refractory brick, fire-resistant 62 of the inboard that is disposed at back side portion 61.

Fire-resistant 62 is to form through the inboard that makes unshaped refractory body flow to back side portion 61, has the bottom of formation 4a and the diapire 20 of bottom 4b, the sidewall of upwards holding up from the two ends of this diapire 20 21.At this embodiment, make sidewall 21 along with the both ends from diapire 20 make progress and open laterally gradually trapezium-shaped with fire-resistant 62.

When making molten iron flow through iron notch 4, the maximum width D of molten iron stream makes molten iron and fire-resistant 's 62 sidewall 21 contacted contact parts, fire-resistant 62 maximum width.In other words, the maximum width D of molten iron stream is maximum widths of mobile molten iron in iron notch 4 when making molten iron flow through iron notch 4.As shown in Figure 5, when fire-resistant 62 shape is seen as trapezium-shaped on sectional view, be exactly the maximum width D of molten iron at the liquid level width of iron notch 4 mobile molten iron.

Below, specify whipping appts 11, adding set 12.

(about whipping appts)

Like Figure 29, shown in 30, whipping appts 11 possesses impeller 10 is arranged, driving part 30 and moving part 50 that lifting unit 31 is moved.

Support 41 and rotation that above-mentioned moving part 50 has supporting impeller 10, driving part 30 and lifting unit 31 etc. are supported on this support 41 and runner 51 that iron notch 4 lids 43 are rotated freely.Support 41 has the pedestal part 52 of extending along iron notch 4.Be provided with from this pedestal part 52 to the foot section that extends below 53 in pedestal part 52, this foot section 53 become via (through) second peristome 26 arrives pedals 42 device nearby.Be provided with rotation runner 51 freely at the front end of putting foot 53 (lower end) with the mode that runner 51 is moved along iron notch.And on pedal 42, be provided with the track (for example guide rail) that makes runner 51 operations with the mode that runner 51 is moved along the iron notch straight line on pedal 42.

According to the whipping appts 12 of the 3rd embodiment, can make part or all rotation of runner 51, whipping appts 11 impellers 10 are moved in the scope that satisfies formula 12.And the phonomoter that runner 51 will be rotated is arranged at support 41, and the driving through this phonomoter is rotated runner automatically.

Adding set 12 and hopper 45, cutting portion 46, helicoid conveyer 47 and preparation are thrown in support 41 pedestal part that spray gun 17 is supported in whipping appts 11).Thus, adding set 12 whipping apptss 11 are moved together.

Particularly, when carrying out desiliconization processing and desulfurization processing, if the impeller 10 of whipping appts 11 is moved, then the preparation of adding set 12 input spray gun 17 also moves simultaneously.

The continuous refining method of blast furnace tapping floor of the present invention is described below.

In the continuous refining method of blast furnace tapping floor; Stage portion 8 is disposed in the iron notch 4 and molten iron is fallen from this stage portion 8; The downstream side that impeller 10 is disposed at stage portion 8 stirs molten iron, and impeller 10 is moved with the mode that satisfies formula (12) along iron notch 3.

Shown in Figure 28 (a); In refining treatment; If under the state of 10 position of fixing impeller, this impeller 10 is rotated, then just touched the same position (place) of refractory body by the molten iron of impeller 10 stirrings, the position that molten iron is often touched receives local loss.

On the other hand; Shown in Figure 28 (b); In refining treatment, if the fixing position of impeller 10 but make this impeller 10 move and impeller 10 is rotated along iron notch 4 not, the molten iron that was then stirred by impeller 10 is owing to the different position (place) that touches refractory body; Thereby refractory body is worn, and then can prolong the life-span of iron notch 4 everywhere.

Therefore, in the present invention,, improved refining efficiency with above-mentioned mode simultaneously, thereby impeller 10 moves with the mode that satisfies formula (12) along iron notch 4 owing to prevent the partial loss of refractory body.

Moving of impeller 4 can reach along vertically moving of iron notch 4 through making whipping appts 11.For example, with to make effusive iron water amount be each impeller 10 of specified amount or move the scope of formula (12) in the spacing of regulation, perhaps continuous mobile the scope of formula (12) in the irrelevant impeller 10 that makes of effusive iron water amount.

Embodiment 4

Below, based on formula (12) come Ming Dynasty style impeller 10 for example to move and carry out that desiliconization is handled or desulfurization is handled of the present invention be strength and comparative example.Implementation condition such as table 7.

Table 7

The same with above-mentioned first embodiment, the desiliconization agent that adds molten iron as expression to brings the index of help to the validity of desilication reaction, has used suc as formula the desiliconization efficiency eta shown in (5) _O2, in addition, the sweetening agent that adds molten iron as expression to brings the index of help to the validity of desulphurization reaction, has used suc as formula the desiliconization efficiency eta s shown in (6).

In addition, will tap a blast furnace the not enough 200mm of greatest wear amount S of the refractory body after finishing as benchmark.

The greatest wear amount S of so-called refractory body not enough 200mm is meant from operation in the past is actual to obtain, if the greatest wear amount S of refractory body surpasses 200mm, even for example be a position as it then, also can make iron notch 4 reach the life-span.If iron notch 4 reaches the life-span, then must carry out the cast of refractory body for iron notch 4 integral body, replace whole this great operation of refractory body of iron notch 4 (below, will replace refractory body sometimes be called casting and constructing after).

Below, table 8 is that embodiment and comparative example have been carried out the result that gathers.

In embodiment 1, in the desiliconization processing, in the scope that satisfies formula (12), move impeller 10 continuously.In embodiment 2～9, to effusive molten iron is being satisfied and moves impeller 10 in the scope of formula (12) on one side continuously at pack into each (for example per 1 bag, 5 bags, 10 bags, 50 bags) of hot metal ladle of downstream side, Yi Bian carry out the desiliconization processing.At embodiment 10, in desulfurization handles, to effusive molten iron is being satisfied continuously mobile impeller 10 in the scope of formula (12) at pack into each (per 5 bags) of hot metal ladle of downstream side.The capacity of a hot metal ladle is 90ton.

And at the mixing position shown in the table 8, expression be from the distance L of stage portion 8 to impeller 10 when impeller 10 is moved.At mixing position fence as shown in table 8, for example the scope of (L/D=0.28～1.39) moves back and forth impeller 10 continuously in L=0.25～1.25 at embodiment 1.2 couples of embodiment with effusive molten iron pack into each of a bag (effusive iron water amount is 90ton) in L=0.25～1.25 (L/D=0.28～1.39) the per 0.05～0.5m of scope move impeller 10.

In the so-called wastage rate shown in the table 8, be meant thickness (the thickness 350mm of the liquid level of molten iron and the contacted contact part J of refractory body), the ratio of the greatest wear amount S of the refractory body after 100 bags are handled with respect to the refractory body of original (behind the casting and constructing).Because the management value of greatest wear amount S is located not enough 200mm, thus very unfavorable be that abrasion loss surpasses 57%.Desiliconization oxygen efficiency eta as shown in table 8 _O2And desiliconization efficiency eta s is the MV that has carried out after 100 bags are handled.

As shown in table 8, in refining treatment, in the scope that satisfies formula (12), move under the situation of impeller 10 desiliconization oxygen efficiency eta continuously _O2Reach desiliconization efficiency eta s and can reach more than 50%, the greatest wear amount S that makes 100 iron clad water flow out refractory body afterwards simultaneously is not enough 200mm.Waste is all below 57%.(embodiment 1～10).

On the other hand, carry out under the situation of refining treatment desiliconization oxygen efficiency eta at the scope internal fixing impeller 10 that does not satisfy formula (12) _O2And desiliconization efficiency eta s less than 50%, the greatest wear amount S of the refractory body after tapping a blast furnace simultaneously reaches more than the 200mm, and abrasion loss substantially exceeds 57%.(comparative example 12).

Above,,, moves with the mode that satisfies formula (12) along the molten iron stream molten iron when being carried out refining according to the present invention through making impeller 10, can prevent the partial loss of refractory body, can improve the efficient of refining treatment simultaneously.

4. the 4th embodiment

Explanation is based on the blast furnace tapping floor equipment of four embodiment of the invention viewpoint below.

In the blast furnace tapping floor equipment based on the 4th embodiment viewpoint, the plane sketch chart of blast furnace tapping floor that is provided with a refining unit is shown in figure 32.Because the blast furnace tapping floor equipment of the 4th embodiment is identical with the equipment essential part shown in Figure 12～14 of second embodiment, thereby its explanation is omitted.

At this, explain that the preparation in the continuous refining of the molten iron that blast furnace tapping floor 1 carries out throws in the appropriate configurations position of spray gun 17, promptly to the suitable point of addition of the refining agent of molten iron.

Figure 31 is the FV as a refining unit 100 of research.

Adding set 12 is thrown in spray gun 17 by hopper 45, cutting portion 46, transfer lime 80 and preparation and is constituted.Hopper 45 is fixed in the top stand 81 that is fixed on base 52.Moving pipe 80 connection cutting portions and preparation throws in pelvic cavity 17 and refining agent is transported to preparation input spray gun 17 quantitatively from cutting portion 46.Transfer lime 80 uses the low easily deformable pitch tube of frictional coefficient.From the conveying of cutting portion 46 via the refining agent of transfer lime from spray gun 17 to preparation that throw in, the drop that utilizes cutting portion 46 and preparation to throw between the spray gun 17 carries out, and hopper 45 is installed in the sufficiently high position of stand 81.

Pedestal part 52 can be thrown in spray gun 17 with preparation and is fixed in the optional position and form; Preparation is thrown in the position of the interpolation mouth 75 of spray gun 17; Can from rotation axis 15 nearby near the sidewall of iron notch 4, and to the upstream side end edge and the change of downstream side end edge of base 52.

Embodiment 5

The preparation of base 52 is thrown in the position of spray gun and carried out the refining treatment that molten iron is carried out in various changes, the appropriate location that the refining agent in the continuous refining of the molten iron that carries out at blast furnace tapping floor 1 adds is studied.

Table 9 is a refining unit 100 and the summaries of blast furnace tapping floor 1 as research, and table 10 is that to use desiliconization agent as refining agent be 5FeO-58Fe ₂O ₃-21CaO-8SiO ₂(in mass%), condition that the desiliconization of carrying out is handled and result's relation thereof.Figure 33 uses the figure that representes with the relation of impeller 10 with the refining agent point of addition in the table 10, and Figure 34 is refining agent point of addition and the desiliconization oxygen efficiency eta in the expression table 10 _O2Between the figure of relation.

The various conditions of the whipping appts 11 in the table 10 are that the eddy current of the molten iron before the suitable position that the research refining agent adds, obtained, produced by impeller 10 is to the width of iron notch 4 agitation condition to all diffusions.

In table 10; The ratio d/D of the diameter d of the impeller 10 of whipping appts 11 and the width of iron notch 4 is 0.56; Rotating speed is 100rpm; And present inventors use the impeller of the diameter that satisfies 0.3≤d/D＜1, in the scope of rotating speed 80～200rpm, have carried out repeatedly experiment, confirm all to be diffused on the whole at the eddy current of molten iron the width of iron notch 4.

And the iron notch width D in the table 10 is with the mode shown in Figure 27 of above-mentioned the 3rd embodiment maximum width at iron notch 4 mobile molten iron.

In addition, from rotating shaft center to the point of addition of impeller apart from M, be exactly the horizontal throw of throwing in the center (axle center) of spray gun 17 from center (axle center) to the preparation of the rotating shaft 15 of impeller 10.

Table 9

Test portion according to the P1 in the position of Figure 32 extracts has been confirmed from the silicone content of the effusive molten iron of blast furnace of table 10, has confirmed the silicone content of the molten iron after desiliconization is handled according to the test portion that extracts at the position of Figure 32 P2.

The same with above-mentioned first embodiment, the desiliconization agent that adds molten iron as expression to brings the index of help to the validity of desilication reaction, has used suc as formula the desiliconization oxygen efficiency η shown in (5) _O2, in addition, the sweetening agent that adds molten iron as expression to brings the index of help to the validity of desulphurization reaction, has used suc as formula the desiliconization efficiency eta s shown in (6).

In addition, in the comprehensive evaluation of table 10 desiliconization processing, with the desiliconization efficiency eta _O2With 50% is that the boundary is decided to be very (" zero ") more than this, below this, is decided to be bad (" * ").

In the refining of stirring with mechanicalness as existing, under situation about comparing with identical unit consumption, desiliconization oxygen efficiency η _O2Be 30～40%.In view of this, at first with desiliconization oxygen efficiency η _O2Be the high efficiency benchmark that is decided to be more than 50%.In this case, the silicon when tapping a blast furnace is 0.38～0.42mass%, and the silicon after handling is below the 0.25mass%.

Through with desiliconization oxygen efficiency η _O2Benchmark be decided to be more than 50%, can improve the efficient (shorten desulfurization time, improve desulfurization amount) that the desulfurization carried out in the subsequent handling of this processing is handled.

Like the table 10 that the desiliconization result carried out arrangement and shown in Figure 33; In the top of the eddy flow that produces by impeller 10 at the molten iron in vertical with the molten iron flow direction or the opposite zone (in the zone that Figure 33 leans on than rotation axis 15) of vertical (left and right directions among Figure 33 (directions X)) component of iron notch with the molten iron flow direction; At horizontal throw M from impeller shaft center to point of addition (preparation is thrown in interpolation mouth 29 centers of spray gun 17); In upstream side 0＜M/D≤0.5 at rotating shaft center o'clock; In downstream side 0＜M/D≤0.8 o'clock, with desiliconization oxygen efficiency η _O2Be decided to be more than 50%.

Why different with downstream side from the scope that can carry out impeller shaft center to the point of addition that good desiliconization handles at upstream side apart from M; Be because shown in Figure 35 (a); The stirring eddy current that produces because of the rotation of impeller 10 is because the mobile downstream side of being partial to of molten iron makes downstream side one side aspect involving in, become the cause of advantageous conditions.

With sweetening agent under the situation that upstream side adds with above-mentioned scope; Most cases is that sweetening agent can directly not flow to downstream side along with the stirring eddy current is involved in together but swims on the molten iron; In addition; Even when desiliconization agent is involved in and stirs eddy current and float, also be easy at molten iron stream and stir the stream position overlapped break away from, flow to downstream side because of contacting deficiently with molten iron from stirring eddy current.

Even with sweetening agent under the situation that upstream side adds with above-mentioned scope, same most cases is that sweetening agent swims in and on the molten iron desilication reaction had no the ground of help and directly flow to downstream side.

Molten iron stream around the impeller 10 that rotates; Produce downstream side flowing to upstream side on the direction opposite with the mode shown in Figure 35 (a) and (b) with molten iron stream from impeller 10; If in this flows, make the sweetening agent colleague; Then desiliconization agent time of helping to react elongatedly adds impeller 10 to from sweetening agent and rotates 1/4～1/2 time quantum, also is favourable on reaction efficiency.Therefore, if identical, then preferably add sweetening agent at downstream side from the value apart from M of impeller shaft center to point of addition.

In the present invention, the upstream side that the optimum range that desiliconization agent is added is defined as at the rotating shaft center is 0＜M/D≤0.5, is 0＜M/D≤0.8 at downstream side.

Figure 36 is expression is represented above-mentioned discovery as the relation of the point of addition that stirs eddy current and refining agent figure.

In above-mentioned embodiment, used cruciform (four blades) as impeller 10, impeller 10 is invaded in the molten iron fully.Can stop in impregnating depth arbitrarily at lifting device 11.So long as make the whole condition that stirs eddy current that produces of iron notch D, just do not limit the shape, rotating speed of impeller 10 etc. especially.

Preparation throw in spray gun 17 be mixing position near, can a refining unit be made the formation that X shown in figure 32, Y direction can move freely.

In addition, each of a refining unit 100, blast furnace tapping floor 1 constitutes perhaps whole structures, shape, size, number, material etc., all can suitably change according to aim of the present invention.

In above-mentioned embodiment, although clear handle, but also be the same in the situation of using sweetening agent as molten iron being carried out the desiliconization that one of purified refining agent used desiliconization agent.Promptly; What the present invention was represented is; Through refining agent is involved in the molten iron effectively, make the reaction interface area of refining agent and molten iron become big, be used to improve the optimum device of speed of response; Even handle the same desulfurization processing that is, do not rely on kind and the composition of refining agent yet and make the refining characteristic equally high with desiliconization.

Application feasibility on the industry

The present invention can be applicable to carrying out the purified method continuously from the effusive molten iron of blast furnace.

Claims (7)

1. the continuous refining method of a blast furnace tapping floor is added in refining agent in the molten iron stream of blast furnace tapping floor in the mobile molten iron and impeller is invaded in the molten iron and rotate, thereby molten iron is mixed with refining agent, comes refining molten iron continuously thus, it is characterized in that,

Configuration is used to step that molten iron is fallen in said molten iron stream; Downstream side at this step disposes said impeller; The point of addition that adds said refining agent is arranged at the downstream side of this impeller; Downstream side at point of addition is provided with the slag that generates behind the molten iron is stirred in removal by said impeller position

With the mode that satisfies formula (11) width of said impeller is set,

Mode to satisfy formula (12)～formula (14) is set said step,

Set the point of addition of said interpolation refining agent with the mode that satisfies formula (15),

Set the position of said removal slag with the mode that satisfies formula (16),

Come on this basis molten iron is carried out refining,

0.3≤d/D＜1…(11)

0＜L/D≤1.5…(12)

H/Z≥1…(13)

θ≥30…(14)

0＜M/D≤0.8…(15)

1.2≤R/D≤5…(16)

Wherein,

D: the width of impeller (m)

D: the maximum width of molten iron stream (m)

L: from the distance (m) of step to impeller

H: the height of step (m)

Z: the degree of depth of molten iron (m)

θ: the gradient of step (deg)

M: from the distance (m) of rotation axis center to the point of addition of impeller

R: from the distance (m) of rotation axis center to the position of removing slag of impeller.

2. continuous refining method as claimed in claim 1 is characterized in that,

After setting with the mode that satisfies following formula (11a)～(16a), molten iron is carried out refining,

0.55≤d/D＜1…(11a)

0＜L/D≤1.0…(12a)

H/Z≥2.2…(13a)

θ≥45…(14a)

0＜M/D≤0.66…(15a)

1.2≤R/D≤4.4…(16a)。

3. blast furnace tapping floor equipment; It possesses: make molten iron mobile molten iron stream from blast furnace casting, in this molten iron stream, add the mobile molten iron refining agent adding set, have the impeller that stirs molten iron whipping appts, will stir the ash pit that the slag on the molten iron is discharged to the outside that floats over that the back produced by said whipping appts; It is characterized in that

Be provided with at the upstream side of said molten iron stream and be used to stage portion that molten iron is fallen; The mode that is positioned at the downstream side of this stage portion with said impeller is provided with whipping appts; Downstream side at this impeller is provided with adding set, at the downstream side of this adding set said ash pit is set

Set the width of said impeller with the mode that satisfies formula (11),

Mode to satisfy formula (12)～formula (14) is set said stage portion,

Set the position of said adding set with the mode that satisfies formula (15),

Set the position of said ash pit with the mode that satisfies formula (16),

0.3≤d/D＜1…(11)

0＜L/D≤1.5…(12)

H/Z≥1…(13)

θ≥30…(14)

0＜M/D≤0.8…(15)

1.2≤R/D≤5…(16)

Wherein,

D: the width of impeller (m)

D: the maximum width of molten iron stream (m)

L: from the distance (m) of stage portion to impeller

H: the height of stage portion (m)

Z: the degree of depth of molten iron (m)

θ: the gradient of stage portion (deg)

M: from the distance (m) of rotation axis center to the adding set of impeller

R: from the distance (m) of rotation axis center to the ash pit of impeller.

4. blast furnace tapping floor equipment as claimed in claim 3 is characterized in that,

Mode to satisfy following formula (11a)～(16a) is set,

0.55≤d/D＜1…(11a)

0＜L/D≤1.0…(12a)

H/Z≥2.2…(13a)

θ≥45…(14a)

0＜M/D≤0.66…(15a)

1.2≤R/D≤4.4…(16a)。

5. the continuous refining method of a blast furnace tapping floor is added in refining agent in the molten iron stream of blast furnace tapping floor in the mobile molten iron and impeller is invaded in the molten iron and rotate, thereby molten iron is mixed with refining agent, comes refining molten iron continuously thus, it is characterized in that,

Stage portion is set in said molten iron stream molten iron is fallen from this stage portion, dispose said impeller at the downstream side of said stage portion molten iron is stirred,

When the said molten iron of refining, impeller is moved in the scope of following formula along the molten iron stream,

0＜L/D≤1.5…(12)

Wherein,

D: the maximum width of molten iron stream (m)

L: from the distance (m) of stage portion to impeller.

6. blast furnace tapping floor equipment, it possesses: make molten iron mobile molten iron stream from blast furnace casting, to mobile molten iron in this molten iron stream, add refining agent adding set, have the whipping appts of the impeller that stirs molten iron, it is characterized in that,

Be provided with at the upstream side of said molten iron stream and be used to stage portion that molten iron is fallen, whipping appts is set so that said impeller is positioned at the mode of the downstream side of this stage portion,

Said whipping appts can make impeller move in the scope of following formula along the molten iron stream,

0＜L/D≤1.5…(12)

Wherein,

D: the maximum width of molten iron stream (m)

L: from the distance (m) of stage portion to impeller.

7. the continuous refining method of a blast furnace tapping floor adds refining agent in the iron notch of blast furnace tapping floor, thereby utilizes impeller to make molten iron and said refining agent mix the said molten iron of refining continuously, it is characterized in that,

At the eddy current that produces by said impeller in the length direction component of said iron notch and said molten iron flow direction quadrature or the zone opposite with said molten iron flow direction, any position interpolation refining agent at least in following position,

(i) in the position of satisfying formula (15b) of the upstream side of said impeller

(ii) in the position of satisfying formula (15) of the downstream side of said impeller

0＜M/D≤0.5…(15b)

0＜M/D≤0.8…(15)

Wherein,

D: the maximum width of molten iron stream (m)

M: from the distance (m) of center of rotation to the point of addition of impeller.

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