CN104141026A - Continuous refining method and continuous refining equipment - Google Patents

Abstract

The invention provides a continuous refining method and a continuous refining equipment. 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 application number: 200680042444.5 (divisional application number: 201210204848.7), the applying date: 2006.12.08, denomination of invention: the divisional application of the application of " continuous refining method and continuous refining equipment ".

Technical field

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

Background technology

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

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

Desiliconization in iron notch, desulfurization processing, adopt mostly

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

(2), after utilizing refining agent being made an addition to the upper surface of molten iron, make it by the mode of the potential energy of the molten iron that is arranged at the stage portion of iron notch and carries out,

(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 the mobile molten iron of stream (tilting runner) → hot metal ladle (hot metal ladle).

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

Although (2) mode has and can complete slag after treatment remove this great advantage in actually operating on blast furnace tapping floor, compares have the problem that reaction efficiency is low with additive method.

Although (3) reaction efficiency of mode is higher, due to the violent setting that needs freeboard (free board) of foaming of slag.Freeboard makes significantly to reduce to the molten iron loading capacity of hot metal ladle or mixer type iron ladle car (torpedo car), reduces production efficiency.In addition, if slag foaming because slag enters hot metal ladle or mixer type iron ladle car together with molten iron, thereby needs other slags to remove device.

(1), (2) processing mode of in iron notch, reacting, although can be omitted in the slagging-off of operation below (slag-off) no matter all favourable aspect heat or time, but owing to being the processing that only relies on the mixing of Continuous Flow when the iron notch, thereby reaction efficiency is low.

The method of the disclosed desulfurization processing of patent documentation 1 is a kind of by the molten iron interpolation sweetening agent being contained in casting ladle is made impeller (agitating vane) invade in this molten iron and makes wheel rotation, the method for carrying out desulfurization.

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

In above-mentioned desulfurization processing and desiliconization processing, two kinds of processing are all to stir with impeller the method that molten iron is processed, with respect in desulfurization is processed molten iron is contained under the state in casting ladle and stirs molten iron, in desiliconization is processed, different from desulfurization processing, be that Continuous Flow is stirred through the molten iron of the molten iron stream of blast furnace tapping floor.

Therefore, from execute-in-place, can enumerate following problem, that is, desulfurization processing as Patent Document 1, carrying out with the molten iron that stirs delay everywhere that desulfurization processing compares is to be relatively easy to, and as described in patent documentation 2, carry out desiliconization processing and even difficulty is processed in desulfurization with the molten iron that impeller stirs continuous flow everywhere, in reducing refining efficiency, not only zero deflection but also stable carry out desiliconization and desulfurization.

In addition, the disclosed technology of patent documentation 2, although by being provided with the desiliconization slot of larger capacity, make desiliconization slot that molten iron mixes completely in hypothesis stop the some time and contact with refining agent and improve can speed of response, but, the problem existing is that its leeway must arrange desiliconization slot and be difficult for guaranteeing setting position, has also increased cost of equipment.

The disclosed technology of patent documentation 3 is a kind of, by cylindric stirring rod being arranged to the upstream side of refining agent nozzle and the sidewall of refining agent nozzle side, molten iron liquid is directed to refining agent nozzle direction by cylindric stirring rod, promotes molten iron to improve the technology of reaction efficiency with contacting of refining agent.

In the disclosed technology of patent documentation 3, at molten iron liquid with because stirring the fluid producing while gathering together, a part of refining agent is for being involved in molten iron liquid but flow to downstream, likely increases and the dosage that reacts irrelevant refining agent.

Patent documentation 4 be a kind of by blast furnace pour into stream action of forced stirring molten iron and refining agent is involved in molten iron by refining agent, molten iron is carried out to the method for refining of refining.

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

Patent documentation 5 is to add by the molten iron to from blast furnace casting the method that sweetening agent carries out desulfurization processing.Carrying out in the method for this desulfurization processing, by after the molten iron of molten iron flow path has added sweetening agent, make the molten iron that is added with sweetening agent via (falling) under inclined wall Rapid Flow, carry out desulfurization.

Patent documentation 6 is the same with patent documentation 5, is to add by the molten iron to from blast furnace casting the method that sweetening agent carries out desulfurization processing.Carrying out in the method for this desulfurization processing, by the molten iron stream that makes the molten iron flow flowing out from blast furnace is divided into two portions, to after the molten iron of the molten iron flow path of side's side (upstream side) has added sweetening agent, the molten iron that makes to be added with sweetening agent drops on the molten iron stream of the opposing party's side (downstream side), carries out desulfurization.And with regard to the desulfurization Fang Eryan in patent documentation 6, in the time that molten iron falls into the molten iron stream of downstream side, by this molten iron being sprayed to pressurized gas, so that unreacted sweetening agent is blown to the Liu center of stirring.

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

Patent documentation 7 discloses a kind of top from blast furnace tapping floor refining agent (treatment agent) is sprayed to the spray gun of use and is arranged at longitudinal pretreatment unit of stream.In this pretreatment unit, by or by refining agent spray use spray gun invade molten iron refining agent is ejected in molten iron together with carrier gas, or the spray gun that makes refining agent spray use is positioned at the top of molten iron refining agent is sprayed together with carrier gas, carries out refining treatment.In addition, in this pretreatment unit, the spray gun that makes refining agent spray use on one side moves, and one side is by refining agent or be ejected into molten iron or spirt molten iron.

As shown in patent documentation 7, move with spray gun by making refining agent spray in the time that molten iron is carried out to refining, can prevent that refractory body because blowing into the blast furnace tapping floor that refining agent causes is in local loss.

But with regard to the pretreatment unit shown in patent documentation 7, although can prevent the loss of refractory body, to refining agent, injection does not specify completely by the moving range of spray gun, with regard to this technology, practical situation are to have reduced reaction efficiency.

Patent documentation 8 is that a kind of downstream side by the scum dredger at blast furnace tapping floor (skimmer) arranges pretreatment reaction groove, and the molten iron in this pretreatment tank is added to sweetening agent, the method for carrying out the desulfurization processing of molten iron.Carrying out in the method for this desulfurization processing, make the downstream side dipping of spray gun (injection lance) towards molten iron flow direction, make sweetening agent spray from this spray gun together with carrier gas on one side, spray gun is moved on one side in width and the molten iron flow direction of pretreatment reaction groove, carry out desulfurization.

Patent documentation 8 is the same with patent documentation 7, owing in the time that molten iron is carried out to refining, spray gun being moved, although thereby can prevent the loss of refractory body part, the moving range of spraying is not specified completely, the same with patent documentation 7, sometimes make reaction efficiency reduction.

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 molten iron, and which reaction efficiency is low sometimes.

Patent documentation 1: special disclosing clear No. 45-31053

Patent documentation 2: No. 54-137420, JP

Patent documentation 3: JP 62-202011 communique

Patent documentation 4: No. 63-105914, JP

Patent documentation 5: No. 02-250912, Unexamined Patent

Patent documentation 6: No. 50-33010, examined patent publication

Patent documentation 7: No. 63-317611, JP

Patent documentation 8: No. 04-052205, Unexamined Patent

Summary of the invention

In view of the above problems, the object 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, by refining agent is positively involved in molten iron, can improve the efficiency of the refining treatment such as desulfurization processing and desiliconization processing.

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, in the time carrying out refining treatment, can prevent the loss of refractory body part, can improve the efficiency 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, by added refining agent is positively involved in molten iron, can obtain high reaction efficiency.

To achieve these goals, a first aspect of the present invention provides a kind of continuous refining method, rotates by adding refining agent in the molten iron to mobile in the molten iron stream of blast furnace tapping floor and impeller being invaded in molten iron, thereby molten iron is mixed with refining agent, carry out thus refining molten iron continuously, wherein

The blade of invading the described impeller also rotating in described molten iron is decided to be to 3～6, and make this blade meet formula (1), formula (2), and, in the mode that meets 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 (m) of the base portion of blade

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

D: the width (m) of blade

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

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

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

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

Inventor, and carries out improving refining efficiency in the time that desiliconization processing or desulfurization are processed and there is no deviation and stable desiliconization or the method for desulfurization are verified mobile molten iron the molten iron stream by be not stirred in blast furnace tapping floor in gamut from various angles.

Particularly, make the number of blade and the different multiple 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 upper end of blade base to the distance h 1 of molten iron upper surface, from the innermost distance h 2 of lower end to the bottom of molten iron stream of blade base), carry out the experiment of desiliconization processing or desulfurization processing on one side.

Found that of experiment, the blade of the above-mentioned impeller also rotating by the above-mentioned molten iron of intrusion is set to 3～6, and in the mode that meets formula (1), formula (2), this blade is set, simultaneously, make this impeller invade molten iron to meet the mode of formula (3), formula (4), even the in the situation that of mobile continuously in molten iron stream, also can improve refining efficiency, and not only zero deflection but also stably carry out desiliconization or desulfurization.

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

Second aspect present invention provides a kind of continuous refining method of blast furnace tapping floor, make to rotate in impeller intrusion molten iron by adding refining agent in the molten iron to mobile in the molten iron stream of blast furnace tapping floor, thereby molten iron is mixed with refining agent, carry out thus refining molten iron continuously, wherein

In described molten iron stream, be configured for the step that molten iron is fallen, configure described impeller at the downstream side of this step, the point of addition that adds described refining agent is arranged to the downstream side of this impeller, arrange and remove the position of being stirred the slag generating after molten iron by described impeller at the downstream side of point of addition

The width of described impeller is set to meet the mode of formula (11),

Set described step in the mode that meets formula (12)～formula (14),

Set the point of addition of described interpolation refining agent to meet the mode of formula (15),

Set the position of described removal slag to meet the mode of formula (16),

Come on this basis molten iron to carry 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 (m) of impeller

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

L: the distance (m) from step to impeller

H: the height (m) of step

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

θ: the gradient (deg) of step

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

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

Present inventor has verified in all its bearings by refining agent is positively involved in molten iron, improves the method for the efficiency of refining treatment.

Particularly, be exactly that 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 of desiliconization processing or desulfurization processing.

Found that of experiment, as long as the width of above-mentioned impeller meets formula (11), step meets formula (12)～formula (14), the point of addition that adds refining agent meets formula (15), the position of taking out the slag in molten iron stream meets formula (16), just refining agent positively can be involved in molten iron, and then improve the efficiency of refining treatment.

Preferably, to meet on the basis that the mode of following formula (11a)～(16a) sets, molten iron is carried out to 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 from the molten iron stream of the molten iron flow of blast furnace casting, in this molten iron stream, mobile molten iron, add refining agent adding set, there is the whipping appts of the impeller that stirs molten iron, ash pit that slag on the molten iron that produce after being stirred by described whipping appts is discharged to outside, wherein

Be provided with the stage portion for molten iron is fallen at the upstream side of described molten iron stream, the mode that is positioned at the downstream side of this stage portion with described impeller arranges whipping appts, downstream side at this impeller arranges adding set, at the downstream side of this adding set, described ash pit is set

Set the width of described impeller to meet the mode of formula (11),

Set described stage portion in the mode that meets formula (12)～formula (14),

Set the position of described adding set to meet the mode of formula (15),

Set the position of described ash pit to meet the mode of 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 (m) of impeller

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

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

H: the height (m) of stage portion

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

θ: the gradient (deg) of stage portion

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

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

Present inventor has verified in all its bearings by refining agent is positively involved in molten iron, improves the method for the efficiency of refining treatment.

Particularly, be exactly that 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 that is 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 of desiliconization processing or desulfurization processing.

Found that of experiment, as long as the width of above-mentioned impeller meets formula (11), stage portion meets formula (12)～formula (14), the position of above-mentioned adding set meets formula (15), the position of above-mentioned ash pit meets formula (16), just refining agent positively can be involved in molten iron, and then improve the efficiency of refining treatment.

Preferably, on the basis of setting in the mode that meets following formula (11a)～(16a), molten iron is carried out to 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, make to rotate in impeller intrusion molten iron by adding refining agent in the molten iron to mobile in the molten iron stream of blast furnace tapping floor, thereby molten iron is mixed with refining agent, carry out thus refining molten iron continuously, wherein

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

Described in refining when molten iron, impeller is moved in the scope of following formula along molten iron stream,

0＜L/D≤1.5 …(12)

Wherein,

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

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

Present inventor has verified in all its bearings by refining agent is positively involved in molten iron, improves the efficiency of refining treatment, prevents the method for the local loss of refractory body that is arranged at molten iron stream simultaneously.

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

In addition, present inventor is in order effectively to utilize to greatest extent both stirrings, and considers that the position relationship of impeller and step is most important, and the efficiency of the refining treatment when the position of impeller and stage portion is changed is tested.Found that of experiment, by making the position relationship of impeller and stage portion meet above-mentioned formula, has improved refining efficiency.

Moreover, consider in order to prevent the local loss of refractory body, and in the time carrying out refining treatment, not the impeller that molten iron is stirred to be stayed in to fixing position but whether impeller is moved in the scope of upstream side and downstream side effective.

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

For implementing the blast furnace tapping floor equipment of aforesaid method, a kind of following equipment, it possesses: make from the molten iron stream of the molten iron flow of blast furnace casting, to add molten iron mobile in this molten iron stream refining agent adding set, there is the whipping appts of the impeller that stirs molten iron, wherein

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

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

0＜L/D≤1.5 …(12)

Wherein,

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

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

Like this, by impeller is moved in the scope that meets above-mentioned formula, the loss of refractory body part can be prevented, the efficiency of refining treatment can be improved simultaneously.

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 described refining agent mix molten iron described in refining continuously, it is characterized in that,

The eddy current producing at described impeller the length direction component of described iron notch with described molten iron flow direction is orthogonal or with the region of described molten iron flow opposite direction, at least any position interpolation refining agent in following position,

(I) meets the position of formula (15b) at the upstream side of described impeller

(II) meets the position of formula (15) at the downstream side of described impeller

0＜M/D≤0.5 …(15b)

0＜M/D≤0.8 …(15)

Wherein,

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

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

According to the continuous refining method based on viewpoint of the present invention, improve refining efficiency, can zero deflection stably carry out again desiliconization or desulfurization simultaneously.

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

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

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

Brief description of the 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 that represents the impregnation state of impeller;

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

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

Fig. 7 has carried out to the relation between blade sheet number and desilication efficiency the figure concluding;

Fig. 8 has carried out to the relation between d/D and desilication efficiency the figure concluding;

Fig. 9 has carried out to the relation between h1/Z and desilication efficiency the figure concluding;

Figure 10 has carried out to the relation between h2/Z and desilication efficiency the figure concluding;

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

Figure 12 is the approximate vertical view of the blast furnace tapping floor equipment of the 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 explanation blast furnace tapping floor equipment;

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

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

Figure 17 has carried out to the relation between d/D and desilication efficiency the figure concluding;

Figure 18 has carried out to the relation between L/D and desilication efficiency the figure concluding;

Figure 19 has carried out to the relation between H/Z and desilication efficiency the figure concluding;

Figure 20 is that the relation between the gradient and the desilication efficiency to stage portion has been carried out the figure concluding;

Figure 21 has carried out to the relation between M/D and desilication efficiency the figure concluding;

Figure 22 has carried out to the relation between R/D and desilication efficiency the figure concluding;

Figure 23 makes iron notch round-shaped and impeller and preparation is thrown in to impeller and be disposed at the layout diagram of 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 summary section when impeller is invaded to other iron notch;

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

Figure 28 is that impeller is when removable and the state graph of the fusing damage to refractory body when irremovable;

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 that represents the point of addition of refining agent;

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

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

Figure 36 is the figure that represents the relation between the point of addition of the refining agent that stirs eddy current and rectification;

Nomenclature

1: 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, the first embodiment

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

First, in following embodiment, explanation be the desiliconization processing that has used desiliconization agent as molten iron being carried out to one of refining agent of refining, but to use the situation of sweetening agent be also the same.; the present invention represents; by refining agent is involved in molten iron effectively; make the reaction contact area of refining agent and molten iron become large and for improving the best approach of speed of response; even process the same desulfurization processing with desiliconization; do not rely on kind and the composition of refining agent, refining characteristic is all equally high.

As shown in Figures 1 to 3, the surrounding of blast furnace is provided with blast furnace tapping floor 1, and this blast furnace tapping floor 1 has the iron notch 4 (molten iron stream) that makes the molten iron flow flowing out from blast furnace 2.

Become to have an ash pit 5 in the position midway of above-mentioned iron notch 4 branch shape, near the downstream of the component of iron notch 4, be provided with so that the slag 6 of molten iron flows to the submerged weir 7 that the mode of ash pit 5 guides.

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

Therefore, the molten iron that just formation is flowed out from blast furnace 2 is at iron notch 4 from upstream flow further downstream, and the slag 6 of molten iron upper surface is tackled by submerged weir and flow to ash pit 5, and molten iron self is to circular groove 9 diffluences simultaneously.And by adding refining agent 22 to molten iron with adding set 12, the impeller 10a or the impeller 10b that make to invade molten iron rotate simultaneously, molten iron that can flow carries out desiliconization processing continuously.

As shown in Figure 4, the sidewall 21 that iron notch 4 has diapire 20 and upwards holds up from this diapire, makes from the both end sides of diapire 20 sidewall 21 along with the cross section trapezium-shaped upwards and gradually outwards shifting.Diapire 20 and sidewall 21 form by pouring into a mould unshaped refractory body.

Then, describe the structure of impeller in detail with continuous refining method.

As shown in Figure 3,4, impeller 10a or impeller 10b are made up of refractory body, have tubular or bar-shaped rotation axis 15 and are arranged at multiple blades 16 of the front end of rotation axis 15.The outstanding essentially rectangular shape of front end direction outside diameter that each blade 16 is rotation moving axis 15.The height b0 of the base portion (with the connection section of rotation axis 15) of each blade 16, to set than the large mode of height b1 of the leading section of blade 10 (protuberance leading section).

, set height b0, the b1 of each blade 16 of blade 10a or blade 10b to meet the mode of formula (1).

b0≥b1 …(1)

In other words, be exactly as shown in Fig. 5 (a)～(c), so that longitudinal wall 16 ˊ of blade 16 and the cross wall of blade 16 16 〞 angulation θ are 90 ° of above modes, form the blade 16 of blade 10a or blade 10b.As shown in Figure 5, the shape of the blade part 16 of blade 10a or blade 10b can be square shape at vertical view, can be also trapezium-shaped, can also be circular shape (chamfering of leading section).

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

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

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

In addition, as shown in Figure 4, be conceived to two the widest blades 16 of width of blade 16, the value that each outstanding length (length from the base portion of blade 16 to the front end of blade 16) is summed up, in other words, using as the outstanding length d 1 of a blade 16 of benchmark with while summing up apart from the outstanding length d 2 of this blade 16 another blade 16 farthest, set the width d of this blade 16 to meet the mode of formula (2) exactly.

0.2≤d/D≤0.8 …(2)

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

Particularly, be exactly as shown in Fig. 6 (a), in the time that the sheet number of blade is 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 is exactly the width d of blade 16.

As shown in Fig. 6 (b), in the time that the sheet number of blade is 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 is exactly the width d of blade 16.

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

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

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

Like this, can effectively carry out continuous desiliconizing processing.The following describes continuous refining method.

First,, in the time making molten iron flow to iron notch 4 from the iron notch of blast furnace 2, use adding set 12 to add refining agent to the molten iron mobile at iron notch 4.Now, make impeller 10a, the 10b of above-mentioned formation invade molten iron and rotate to meet the mode of formula (3), formula (4), molten iron and refining agent are mixed.

0＜h1/Z≤0.4 …(3)

0＜h2/Z≤0.4 …(4)

Wherein,

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

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

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

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

The molten iron that has completed 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 desilication efficiency, 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 the embodiment that makes impeller 10 and use this impeller 10 to carry out desiliconization processing to meet the mode of formula (1), (2), and makes the comparative example that does not meet the impeller 10 of formula (1), (2) and use this impeller 10 to carry out desiliconization processing.And implementation condition is as table 1.

Table 1

Implementation condition

There is chemical reaction and according to Si+2O=SiO in the oxygen element (O) in the element silicon (Si) in molten iron and desiliconization agent 11 ₂this chemical equation forms SiO ₂and be removed from molten iron.As representing that whether the desiliconization agent 11 that adds molten iron to has helped the index of desilication reaction effectively, has used suc as formula the desilication efficiency shown in (5).

Desilication efficiency represents to be applied to respect to the oxygen element in desiliconization agent 11 ratio of the oxygen element of the oxidation of the Si in molten iron.

Mathematical expression 1

${\mathrm{\&eta;}}_{o2}=\frac{\mathrm{\&Delta;}\left[\mathrm{Si}\right]\&times;32/28\&times;1000}{W_F\&times;C_o}\&times;100(\%),\mathrm{\&Delta;}\left[\mathrm{Si}\right]={\left[\mathrm{Si}\right]}_i-{\left[\mathrm{Si}\right]}_f\&CenterDot;\&CenterDot;\&CenterDot;\left(5\right)$

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

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

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

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

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

Table 2, Fig. 7～Figure 10 are the charts of having concluded the desilication efficiency while using multiple impellers 10 to carry out desiliconization processing.Result as shown in table 2, Fig. 7～Figure 10 is described below.

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

In actual operation, being subject to the maximum unit consumption of the desiliconization agent that the restriction of the input speed of molten iron flow speed and desiliconization agent can throw in is 60kg/ton, the in the situation that of desilication efficiency less than 60%, maximum silicon concentration in the time tapping a blast furnace is during up to about 0.7mass%, and more than half silicon after treatment exceed 0.25mass%.So, must guarantee that desilication efficiency is more than 60%.

(about the blade sheet number of impeller)

As shown in table 2 and Fig. 7, if the sheet number of blade 16 arrives three of less thaies less, will cause desilication efficiency less than 60% (comparative example 12,13).Think, this is the reason reducing due to the sheet number ability (stirring capacity) few thereby that will make desiliconization agent 11 be involved in molten iron in the time that impeller 10 is rotated of blade 16.

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

So the sheet number of blade 16 can improve stirring capacity, be preferably difficult to adhere to 3～6 of slag simultaneously, like this, can make desilication efficiency reach more than 60%.

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

As shown in table 2 and Fig. 8, when the pass between the width of blade 16 and the maximum width of molten iron stream is d/D < 0.2, desilication efficiency does not reach 60% (comparative example 19,20).

Think, reason is wherein, this means make impeller when dipping the dipping width with respect to the maximum width impeller 10 of molten iron stream (width is d) too little, even wheel rotor 10, also can only be to applying whipping force at a part of molten iron of impeller 10 Flow Structure Nearbies, and to not applying enough whipping forces away from the mobile molten iron of impeller 10.

That is, because the molten iron of the sidewall 4a side flow forming metal trough 4 passes through from the place of the blade 16 away from impeller 10, therefore almost stir less than.The molten iron not obtaining in enough stirrings directly can not mix with desiliconization agent 11 downstream fully from upstream flow.

On the other hand, while being d/D > 0.8 in the pass between the width of blade 16 and the maximum width of molten iron stream, desilication efficiency does not reach 60% (comparative example 15,20).

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

So, relation between the maximum width of the width of blade 16 and molten iron stream, preferably neither excessive not too little of the relation shown in (2) again with respect to the diameter of molten iron stream or the width d of width leaves 16, like this, can make desilication efficiency reach more than 60%.

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

As shown in table 2 and Fig. 9, in the time that the base portion upper end of blade 16 and molten iron upper surface form a face,, the full depth of molten iron and while being h1/Z=0 from upper end to the pass between the distance of molten iron upper surface of the base portion of blade 16, desilication efficiency 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, just rotate at the interface of desiliconization agent 11 and molten iron level the upper end of the base portion of blade 16, desiliconization agent 11 can not be involved in to molten iron fully.

On the other hand, while being h1/Z > 0.4 in the full depth of molten iron with from base portion upper end to the pass between the distance of molten iron upper surface of blade 16, desilication efficiency will not reach 60% (comparative example 20).

Think, reason is wherein, makes wheel rotation even the blade of impeller 10 16 is sunk to molten iron, also can only be to applying whipping force at a part of molten iron of impeller 10 Flow Structure Nearbies, and can not apply whipping force to molten iron mobile above blade 16.Cause molten iron mobile above blade 16 directly from upstream flow downstream, can not mix with desiliconization agent 11 fully.

So, the full depth of molten iron and preferably impeller 10 is not only too shallow but also not too dark in shown in (3) with respect to molten iron from the base portion upper end of blade 16 to the relation between the distance of molten iron upper surface, like this, just can make desilication efficiency reach more than 60%.

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

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

On the other hand, make the blade 10 of impeller 10 leave the deep of molten iron stream bottom, when relation between the distance in the deep of the lower end of the front end of the joint blade of full depth of molten iron to molten iron stream bottom is made to h2/Z > 0.4, desilication efficiency will not reach 60% (comparative example 13,21,22).

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

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 is not only too shallow but also not too dark in shown in (4) with respect to molten iron, like this, just can make desilication efficiency reach more than 60%.

Above, the sheet number of the blade of impeller 10 16 is being made to 3～6, while making it meet formula (1), formula (2) and carry out desiliconization and process simultaneously, by invading in molten iron in the mode that meets formula (3), formula (4) and rotating, can improve desilication efficiency, simultaneously both zero deflection by stably carrying out desiliconization.

Embodiment 2

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

Table 3

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

Mathematical expression 2

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

Wherein,

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

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

Show to process equally with desiliconization, in desulfurization processing, as long as meet blade sheet number and formula (1)～(4) of impeller, just can improve desulfuration efficiency.

The in the situation that of desulfuration efficiency less than 50%, due to the desulfurization process that sometimes also needs to append, cause 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 the above-described embodiment, stir molten iron with an impeller 10 and carry out desiliconization or desulfurization processing, but also can multiple impellers 10 be set at groove 4 (straight line portion of iron notch 4) or circular groove 9 is interior.

In the above-described embodiment, illustrate that iron notch 4 is the situation of trapezium-shaped on section, but as shown in figure 11, utilized the etch of flowing and accompanying with molten iron, no matter iron notch 4 is changed into and is seen as roughly circular shape on section or adopts the condition as publicity of the present invention, all without a doubt.

2. the second embodiment

The blast furnace tapping floor equipment of the second embodiment of the present invention is described below.

As shown in Figure 12 and Figure 13, the surrounding of blast furnace 2 is provided with blast furnace tapping floor 1, and this blast furnace tapping floor 1 has the iron notch 4 that makes the molten iron flow flowing out from blast furnace 2.

Iron notch 4 is that the molten iron that flows out from blast furnace 2 is introduced to the molten iron stream that makes hot metal ladle and hot-metal ladle and carriage etc. that molten iron flows to.Molten iron flows to the right from the left side of Figure 12.Therefore, the left side of Figure 12 is called to upstream, the right side of Figure 12 is called to downstream.

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

Be provided with the stage portion 8 of giving prominence to upward from the bottom of iron notch 4 at the downstream side of the first submerged weir 7.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 the first submerged weir 7), the vertical component effect 8a upwards holding up, the rake 8c from this vertical component effect 8a to the horizontally extending horizontal part 8b of downstream side, from this horizontal part 8b to the bottom angled of the downstream side of iron notch 4 roughly meet at right angles.

Dispose and there is the whipping appts 11 that stirs the impeller 10 of molten iron by rotation at the downstream side of stage portion 8, 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 row slag chute 13, and this second row slag chute 13 carries out deslagging to the slag generating carried out stirring with impeller 10 after.At the downstream side of the iron notch 4 of the tapping point of second row slag chute 13, be provided with slag 14 to generating after having been undertaken by impeller 10 stirring and guide and make it flow to the second submerged weir 18 of second row slag chute 13.

As shown in figure 16, iron notch 4 has the bottom of formation 4a and the diapire 20 of bottom 4b, the sidewall 21 of upwards holding up from this diapire 20, and sidewall 21 is made from the both ends of diapire 20 upwards to abducent cross section trapezium-shaped gradually.Diapire 20 and sidewall 21 form by pouring into a mould unshaped refractory body.

Below, very thin explanation stage portion 8, whipping appts 11, adding set 12, second row slag chute 13.

(about whipping appts)

As shown in Figure 24, 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, make the lifting device 31 of impeller 10 and driving part 30 liftings.

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

The second rotating shaft 36 is rotated and is supported on freely on supporting mass 37 by upper and lower pair of bearings 38.Be provided with the connection device 39 being connected on coaxial with the rotation axis 15 of following impeller 10 and this axle second rotating shaft 36 in the bottom of the second rotating shaft 36.

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

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

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

The rotation axis 15 of impeller 10 is arranged 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.By connection device 39, the upper end of rotation axis 15 is connected in to the second rotating shaft 36 of driving part 30.

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

So that meeting the mode of formula (11), the width of impeller 10 sets the width of this impeller 10,

0.3≤d/D＜1 …(11)

Wherein,

D: the width (m) of blade

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

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

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

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

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

In addition, by utilizing the lifting unit 31 of whipping appts 11 to make supporting mass 37 liftings, changeable for to make the blade 16 of impeller 10 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.

When carrying out desiliconization processing and desulfurization and processing, after utilizing lifting unit 31 that supporting mass 37 is declined and making the postures of 16 one-tenths dippings of blade of impeller 10, startup drivingmotor 32 rotates the blade 16 of invading molten iron.

(about stage portion)

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

0＜L/D≤1.5 …(12)

H/Z≥1 …(13)

θ≥30 …(14)

Wherein,

L: the distance (m) from step to impeller

H: the height (m) of step

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

θ: the gradient (deg) of step.

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

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 that represents the degree of depth of the molten iron of the downstream side of 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, specifically, and the acute angle that the rake 8c upwards holding up with bottom 4b from the smooth bottom 4d of iron notch 4 exactly becomes.

(about adding set)

As shown in figure 24, adding set 12 has: the hopper 45 of storage refining agent, the refining agent that bottom from hopper 45 is discharged carry out refinement cutting cutting portion 46, carry the preparation of being sent 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.

The formation of helicoid conveyer 47 is, have along going out the cylindrical shell 48 that flowing molten iron grass 4 extends and being arranged at coaxial and at the interior rotation of cylindrical shell 48 water screw 49 freely with the axle center of this cylindrical shell 48 in this cylindrical shell 48, utilize the rotation of water screw 49, by rotating, the refining agent from 46 cuttings of cutting portion is carried to preparation input spray gun 17.

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 meeting the mode of formula (15), the position of adding set 12 sets the position of this adding set 12,

0＜M/D≤0.8 …(15)

Wherein,

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

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

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

(about second row slag chute)

Set the position of ash pit (second row slag chute 13) to meet the mode of formula (16),

1.2≤R/D≤5 …(16)

Wherein,

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

The position of so-called second row slag chute 13, first finger is held the position of the sidewall 13a (upper end of sidewall 13a) of second row slag chute 13 downstream sides of shape in section city.Suc as formula the R shown in (16), it is the horizontal throw from the sidewall 13a (upper end of sidewall 13a) of the downstream side to second row slag chute 13 of the rotation axis 15 of impeller 10.

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

According to blast furnace tapping floor device 1, from blast furnace 2 molten iron out, flow to downstream side by the first submerged weir 7 to stage portion 8, slag 6 flows to first row slag chute 5.And, to the mobile molten iron of stage portion 8, just can arrive by the horizontal part 8b of stage portion 8 the rake 8c of stage portion 8, flow to again downstream side 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 4b of iron notch 4 from stage portion 8 (horizontal part 8b).The molten iron falling from stage portion 8, by falling and be stirred 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, then flows to the downstream side of swimming more on the lower than impeller 10.Refining agent (for example desiliconization agent or sweetening agent) is added near the molten iron arriving adding set 12, carries out desiliconization and the desulfurization of molten iron.

Carried out the molten iron of desiliconization processing or desulfurization processing, and flow to downstream side via the second submerged weir 18 to stage portion 8, the slag 14 becoming because of the stirring of impeller 10 or the interpolation of refining agent flows to second row slag chute 13.

Embodiment 3

Below, taking based on formula (11)～formula (16) in the position of the height to stage portion position, stage portion and the gradient, adding set, the position of second row slag chute carried out carrying out on default basis the embodiments of the invention of desiliconization processing or desulfurization processing and comparative example and described as example.Implementation condition is as table 5.

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

Table 5

The same with above-mentioned the first embodiment, add as representing the index that the desiliconization agent of molten iron is helped the validity band of desilication reaction to, use suc as formula the desilication efficiency η shown in (5) _o2, in addition, add as representing the index that the sweetening agent of molten iron is helped the validity band of desulphurization reaction to, use suc as formula the desilication efficiency η shown in (5) _s.

The composition of refining agent also can comprise FeO and/or Fe in the time of desiliconization agent ₂o ₃, in the time of sweetening agent, also can comprise CaO.In present embodiment, use 5FeO-58Fe as desiliconization agent ₂o ₃-21CaO-8SiO ₂(in mass%), has used 80CaO-3SiO as sweetening agent ₂-3MgO-6Al ₂o ₃-8M.A1 (in mass%).

With regard to existing refining of stirring by mechanicalness, in the time that the desiliconization agent unit consumption with identical is made comparisons, desiliconization oxygen efficiency eta _o2be 30～40%.Given this, first with desiliconization oxygen efficiency eta _o2for high efficiency more than 50% as benchmark.Now, the element silicon (Si) while tapping a blast furnace is 0.38～0.42mass%, and element silicon after treatment (Si) reaches below 0.25mass%.

Equally, in the time that the sweetening agent unit consumption with identical is made comparisons, desilication efficiency η _sbe 30～40%.Given this, first with desulfuration efficiency η _sfor high efficiency more than 50% as benchmark.Now, the element sulphur (S) while tapping a blast furnace is 0.022～0.023mass%, and element sulphur after treatment (S) reaches below 0.010mass%.

By by desilication efficiency η _o2benchmark be decided to be more than 50%, can improve the desulfurization carried out in the subsequent handling of this processing efficiency (shorten desulfurization time, improve desulfurization amount) in processing.

In addition, at desilication efficiency η _sdo not reach in 50% situation, the desulfurization process that just need to append again, because will cause reduction and the thermal losses of production efficiency, thereby very undesirable in operation.Therefore, must guarantee desilication efficiency η _sreach more than 50%.

Moreover, in actual operation, be than the also situation of high high density of 0.50mass%, even in this case at the element silicon (Si) of the molten iron flowing out from blast furnace, in order to make element silicon after treatment (Si) reach 0.25mass%, just need to be by desilication efficiency η _o2benchmark be decided to be more than 60%.

Therefore, preferably in the case of the higher high density of the element silicon (Si) of molten iron that flows out from blast furnace, by desilication efficiency η _o2benchmark be decided to be more than 60%.

In addition, for in subsequent handling, contingent to increase sulphur corresponding again, preferably by desilication efficiency η _sbenchmark be decided to be more than 60%.

Table 6, Figure 17～22nd, the desiliconization oxygen efficiency eta while processing having carried out desiliconization processing or desulfurization _o2, desulfuration efficiency carried out situation about gathering.Below, the result as 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 4 as shown in figure 12 floods impeller 10, the situation of simultaneously adding refining agent.In addition, so-called circular groove as shown in table 6, the circular arc portion that is illustrated in iron notch 4 as shown in figure 12 floods impeller 10, the situation of simultaneously adding refining agent.The in the situation that 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 the refining treatment in blast furnace tapping floor, due to for carrying out desiliconization processing or desulfurization processing at the interior mobile molten iron of iron notch 4, thereby must continuous adding desiliconization agent or sweetening agent.

In refining treatment, most importantly, even continuous adding refining agent also will positively involve in molten iron by refining agent.If with respect to the maximum width D of molten iron stream, the width d of impeller 10 is too small, the stirring eddy current also little (whipping force is little) causing because of the rotation of impeller 19, cause a part or most of refining agent not to be involved in molten iron and be helpless to reaction, directly flow to downstream from upstream, consequently reduced reaction efficiency.

As shown in table 6 and Figure 17, in the width D that arrives most with respect to molten iron stream, while representing the d/D less than 0.3 of ratio of width d of impeller 10, if too small with respect to the width d of the maximum width D impeller 10 of molten iron stream, will make desiliconization oxygen efficiency eta _o2do not reach 50% (comparative example 45～47).

On the other hand, as shown in table 6 and Figure 17, can find out in the time of 0.3≤d/D < 1, enough large with respect to the width d of the maximum width D impeller 10 of molten iron stream, will make whipping force large, make desiliconization oxygen efficiency eta _o2do not reach 50% (embodiment 1～44).

And in the situation that meeting formula (11), when d/D ≒ 1, utilization, with respect to the position of direction under the top of the impeller 10 of iron notch 4, is connected in iron notch 4 by impeller., sometimes the maximum width D of the width d of impeller 10 and molten iron stream is decided to be basic identical.Under this condition, can not make impeller 10 and iron notch 4 wheel rotor 10 that contacts self is invalid as operation.In the application of formula (11), natural in the scope that does not make impeller 10 and iron notch 4 contact, so that the rotating condition of impeller 10 meets formula (11).

As shown in figure 17, particularly preferably adopt and make desiliconization oxygen efficiency reach more than 60% condition, be about to

0.55≤d/D＜1 …(11a)

As the condition of the continuous refining method of blast furnace tapping floor.

(about the position of stage portion and stage portion)

By stage portion being arranged to iron notch 4, molten iron is fallen, utilize this falling can make molten iron that turbulent flow occurs.Utilize the turbulent flow of the molten iron producing, can reach the effect that because stirring molten iron, refining agent is involved in to molten iron.

, a part for the refining agent being sometimes added at the downstream side of impeller 10, turns back to the rake 8c of stage portion 8, and by the stirring of stage portion 8, the unreacted refining agent that turns back to stage portion 8 positively can be involved in molten iron by the rotation of impeller.

In addition, the rake 8c of stage portion 8 work as balk board and molten iron flow in cause turbulent flow, consequently, can reach the balk board effect that the unreacted refining agent returning is involved in to molten iron.

Like this, owing to can obtaining causing by stage portion 8 is set the stirring of molten iron, unreacted refining agent is involved in to the effect of molten iron, thereby can expect to be combined by the mechanicalness of the stirring of stage portion 8 and impeller 10 is stirred to the two, refining agent positively can be involved in molten iron.

Moreover, in order effectively to utilize to greatest extent both stirrings, the most importantly position relationship of stage portion 8 and impeller 10.As shown in Figure 15, formula (12), the position relationship of stage portion 8 and impeller 10, upwards the holding up and representing with the ratio (L/D) of the distance to impeller 10 to the relative stage portion 8 of width D of available and molten iron stream.The value of its meaning L/D is larger, and stage portion 8 and impeller 10 are at a distance of far away.

As shown in table 6 and Figure 18, the value of L/D is greater than at 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 exceedes 1.5, because stage portion 8 and impeller 10 is at a distance of excessively far away, 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 _o2.That is, the situation that the value of L/D is greater than 1.5, in the molten iron of stage portion 8 stirs, will make refining involved in molten iron this to involve in effect very little, be only equal in fact, with the stirring of impeller 10, refining agent involved in to molten iron.

And in the time of L/D ≒ 0, mean that the two position of stage portion 8 and impeller 10 is identical, and due under this condition, can not make impeller 10 self rotate as being invalid in operation, thereby except L/D ≒ 0, be set as 0 < L/D≤1.5.

In addition, as shown in figure 18, particularly preferably adopt desiliconization oxygen efficiency eta _o2reach more than 60% condition, that is, and will

0＜L/D≤1.0 …(12a)

As the condition of the continuous refining method of blast furnace tapping floor.

(about the height of stage portion)

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

As shown in table 6, Figure 19, if with respect to the degree of depth Z of molten iron, the height H of stage portion 8 is high, and the value of H/Z exceedes 1, desiliconization oxygen efficiency eta _o2to reach more than 50% (embodiment 1～44).As shown in table 6, 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, desiliconization oxygen efficiency eta _o2to not reach 50% (comparative example 48～50).

The preferably higher limit of H/Z, the height H of stage portion 8 is determined by equipment restriction.For example, as shown in figure 19, even if the value of H/Z is 4.0, desiliconization oxygen efficiency eta _o2also will reach more than 50%, equipment restriction is also no problem.

In addition, as shown in figure 19, particularly preferably adopt and make desiliconization oxygen efficiency eta _o2reach more than 60% condition, that is, and will

H/Z≥2.2 …(13a)

As the condition of the continuous refining method of blast furnace tapping floor.

(about the gradient of stage portion)

If the larger refining agent to molten iron of the gradient θ of stage portion 8 involve in effect larger (raising reaction efficiency).As shown in table 6, Figure 20, if the gradient θ of stage portion 8 exceedes 30 °, desiliconization oxygen efficiency eta _o2to reach more than 50% (embodiment 1～44).As shown in table 6, Figure 20, on the contrary, if 30 ° of the gradient θ deficiencies of stage portion 8, desiliconization oxygen efficiency eta _o2to not reach 50% (comparative example 51,52).And the gradient θ of stage portion 8 is made as to the maximum value of 90 °, desiliconization oxygen efficiency eta _o2for reaching more than 50%.

In addition, as shown in figure 20, particularly preferably adopt and make desiliconization oxygen efficiency eta _o2reach more than 60% condition, that is, and will

θ≥45 …(14a)

As the condition of the continuous refining method of blast furnace tapping floor.

(about the position of adding set)

About the position of adding set 12, throw in the position of spray gun 17 about the preparation of adding set 12, stir the position of the impeller 10 of molten iron with respect to mechanicalness, can consider two schemes of upstream side and downstream side.Be disposed at the upstream side of impeller 10 in the case of the preparation of adding set 12 is thrown in to spray gun 17, with regard to flowing to downstream side, the dosage of refining agent increased because nearly all involving in molten iron.

In the case of the preparation of adding set 12 is thrown in to spray gun 17 set positions in the downstream side of the position of impeller 10, be easy to flow to stage portion 8 sides by the rotation refining agent of impeller 10 is contrary with the flow direction of molten iron, consequently, with regard to flowing to downstream side, the dosage of refining agent is reduced because nearly all involving in molten iron.

As shown in Fig. 6, table 21, in the M/D of position that represents the preparation input spray gun 17 relative with the position of impeller 10, as long as desiliconization oxygen efficiency eta just can be guaranteed in M/D≤0.8 _o2to reach more than 50% (embodiment 1～44).

As shown in table 6, Figure 21, can find out, if the value of M/D exceedes 0.8, due to impeller 10 and preparation input spray gun 17 wide aparts, thereby can not refining agent be involved in to molten iron by stirring, make desiliconization oxygen efficiency eta _o2do not reach 50% (comparative example 58～60).

And because what is called is made as the value of M/D below 0, mean that 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.In addition, it is identical with the position of impeller 10 that M/D=0 means that preparation is thrown in spray gun 17, and owing to preparation being thrown in to the position of spray gun 17 and impeller 10, to fix on same position be impossible physically, thereby remove M/D=0.

As shown in figure 21, particularly preferably adopt and make desiliconization oxygen efficiency eta _o2reach more than 60% condition, that is, and will

0＜M/D≤0.66 …(15a)

As the condition of the continuous refining method of blast furnace tapping floor.

(about the position of second row slag chute)

In near of position that disposes impeller 10, if second row slag chute 13 is set, in the slag 14 after stir process, sneak into molten iron, caused slag can not separate with molten iron, likely in slag 14, sneaked into slag 14 under the state of molten iron and flow to second row slag chute 13.Consequently, not only cause iron loss, also owing to sneaking into molten iron in slag 14, the characteristic of slag 14 is changed.

If the slag 14 that the characteristic that makes slag 14 has been occurred to change is at the interior rear threading slag bag of the second deslagging 13, due to the loss (damage) that is arranged at slag bag refractory body acutely, and likely shorten life-span of slag bag.

On the other hand, in the position in place away from disposing impeller 10, be provided with second row slag chute 13, before slag 14 is discharged to second row slag chute 13, make slag 14 solidify.Consequently, have nearby piling up of impeller 10 slag 14 generating because of the refining agent of initial stage interpolation, likely in operation, cause obstacle.

As shown in table 6, Figure 22, in the R/D of the R of the position of the second row slag chute 13 relative with the position of impeller 10 in expression, when R/D > 5.0, impeller 10 and second row slag chute 13 are at a distance of too far away.Therefore, although desiliconization oxygen efficiency eta _o2be more than 50%, but decline and more than 200 DEG C (on Figure 22 and table 6, use surface temperature slippage Δ T to the temperature of deslagging after slag 14 generates _srepresent the degree of the temperature reduction of slag), slag is solidified and be difficult to flow (comparative example 63).

In addition, in the time of R/D < 1.2, because impeller 10 and second row slag chute 13 is at a distance of too near, and make in slag 14 to have sneaked into molten iron, although desiliconization oxygen efficiency eta _o2be more than 50%, but increased the ferrous components (comparative example 61,62) that is contained in slag 14.

As shown in figure 22, in the time of R/D < 1.2, will make the M.Fe that is contained in slag 14 exceed 20% (M.Fe > 20%).In actually operating, the M.Fe that is contained in slag 14 is below 20%, and the surface temperature slippage Δ T of slag 14 _s200 DEG C of less thaies, just become good operational condition.

As shown in figure 22, particularly preferably adopt and make desiliconization oxygen efficiency eta _o2reach more than 60% condition, that is, and will

1.2≤R/D≤4.4 …(16a)

As the condition of the continuous refining method of blast furnace tapping floor.

Pre-determine the height of position, stage portion of width, the stage portion of impeller and the gradient, the position of adding set, the position of second row slag chute above at blast furnace tapping floor equipment 1 based on formula (11)～(16), by carrying out on this basis refining treatment, can improve the efficiency of refining treatment.

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

In superincumbent embodiment, on section, be seen as the situation of trapezium-shaped although the description of iron notch 4, but as shown in Figure 26 (b), no matter by with the soaking of accompanying of flowing of molten iron, iron notch 4 being changed at roughly circular shape of sectional view, still adopt the condition of publicity of the present invention all without a doubt.In addition, as shown in Figure 26 (a), on sectional view, be seen as essentially rectangular shape no matter iron notch 4 changes, still adopt the condition of publicity of the present invention all without a doubt.

; as long as make the position of position, the second row slag chute of the height of position, stage portion of width, the stage portion of impeller and the gradient, adding set meet formula (11)～(16) and formula (11a)～(16a), just can improve that desulfurization is processed and the efficiency of the refining treatment such as derailing processing.

3. the 3rd embodiment

Blast furnace tapping floor equipment based on third embodiment of the invention viewpoint is described below.

Identical due to shown in the blast furnace tapping floor equipment of the 3rd embodiment and Figure 12～14 of the second embodiment, thereby distinct portions is only described below.

As 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 inner side of this insulation part 60 and the back part 61 that is made up of refractory brick, the fire-resistant portion 62 of inner side that is disposed at back part 61.

Fire-resistant portion 62 is that the inner side by making unshaped refractory body flow to back part 61 forms, and has the bottom of formation 4a and the diapire 20 of bottom 4b, the sidewall 21 of upwards holding up from the two ends of this diapire 20.At this embodiment, sidewall 21 is made to along with the trapezium-shaped upwards and gradually opening laterally from the both ends of diapire 20 by fire-resistant portion 62.

In the time making molten iron flow through iron notch 4, the maximum width D of molten iron stream is at the contact part that the sidewall 21 of molten iron and fire-resistant portion 62 is contacted, the maximum width of fire-resistant portion 62.In other words, the maximum width D of molten iron stream is the maximum width at the interior mobile molten iron of iron notch 4 in the time making molten iron flow through iron notch 4.As shown in Figure 5, in the time that the shape of fire-resistant portion 62 is seen as trapezium-shaped on sectional view, be exactly the maximum width D of molten iron at the liquid level width of the mobile molten iron of iron notch 4.

Describe whipping appts 11, adding set 12 in detail below.

(about whipping appts)

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

Above-mentioned moving part 50 has the support 41 of supporting impeller 10, driving part 30 and lifting unit 31 etc., and rotate be supported on freely this support 41 and make iron notch 4 cover the runner 51 of 43 rotations.Support 41 has the base portion 52 of extending along iron notch 4.Be provided with the foot section 53 from this base portion 52 to downward-extension in base portion 52, this foot section 53 becomes via (passing through) second peristome 26 and arrives pedal 42 device nearby.Be provided with rotation runner 51 freely at the front end (lower end) of putting foot 53 in the mode that can make runner 51 move along iron notch.And on pedal 42, for example, can make runner 51 be provided with along the mode of iron notch rectilinear movement the track (guide rail) that runner 51 is moved 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 meets formula 12.And preferably the electric motor that runner 51 is rotated is arranged to support 41, make runner automatic rotating by the driving of this electric motor.

Adding set 12 and hopper 45, cutting portion 46, helicoid conveyer 47 and preparation input spray gun 17 are supported in the support 41 (base portion) of whipping appts 11.Thus, can make adding set 12 whipping apptss 11 move together.

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

The following describes the continuous refining method of blast furnace tapping floor of the present invention.

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

As shown in Figure 28 (a), in refining treatment, if this impeller 10 is rotated under the state of 10 position of fixing impeller, the molten iron being stirred by impeller 10 just touches the same position (place) of refractory body, and the position that likely makes molten iron often touch is subject to local loss.

On the other hand, as shown in Figure 28 (b), in refining treatment, if do not fix the position of impeller 10 but make this impeller 10 move and impeller 10 is rotated along iron notch 4, the molten iron being stirred by impeller 10 is owing to touching the different position (place) of refractory body, thereby can make refractory body be worn, and then can extend the life-span of iron notch 4 everywhere.

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

The movement of impeller 4 can be by making whipping appts 11 reach along vertically moving of iron notch 4.For example, the each impeller 10 that is specified amount by the iron water amount that makes to flow out or mobile in the scope of formula (12) with the spacing of regulation, or have nothing to do and make impeller 10 continuous moving in the scope of formula (12) with the iron water amount flowing out.

Embodiment 4

Coming for example based on formula (12) that Ming Dynasty style impeller 10 moves and carry out the of the present invention of desiliconization processing or desulfurization processing below, is strength and comparative example.Implementation condition is as table 7.

Table 7

The same with above-mentioned the first embodiment, add as representing the index that the desiliconization agent of molten iron is helped the validity band of desilication reaction to, use suc as formula the desilication efficiency η shown in (5) _o2, in addition, add as representing the index that the sweetening agent of molten iron is helped the validity band of desulphurization reaction to, use suc as formula the desilication efficiency η shown in (6) _s.

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

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

Below, table 8 is that embodiment and comparative example have been carried out to remittance the long and.

In embodiment 1, in desiliconization processing, continuous moving impeller 10 in the scope that meets formula (12).In embodiment 2～9, each (for example every 1 bag, 5 bags, 10 bags, 50 bags) of packing the molten iron of outflow into hot metal ladle at downstream side are being met in the scope of formula (12) to continuous moving impeller 10 on one side, desiliconization processing is carried out on one side.At embodiment 10, in desulfurization processes, each (every 5 bag) of packing the molten iron of outflow into hot metal ladle met to continuous moving impeller 10 in the scope of formula (12) at downstream side.The capacity of a hot metal ladle is 90ton.

And at the mixing position shown in table 8, expression be the distance L from stage portion 8 to impeller 10 when impeller 10 is moved.At mixing position fence as shown in table 8, for example at embodiment 1, in L=0.25～1.25, the scope of (L/D=0.28～1.39) moves back and forth impeller 10 continuously.Embodiment 2 to the molten iron of outflow is packed into a bag (iron water amount of outflow is 90ton) each in L=0.25～1.25 the mobile impeller 10 in scope every 0.05～0.5m ground of (L/D=0.28～1.39).

In the so-called wastage rate shown in table 8, refer to the thickness (the thickness 350mm of the contact part J that the liquid level of molten iron and refractory body contact) with respect to the refractory body of original (after casting and constructing), the ratio of the greatest wear amount S of 100 bag refractory body after treatment.Due to the management value of greatest wear amount S is located to not enough 200mm, thus very undesirable be that abrasion loss exceedes 57%.Desiliconization oxygen efficiency eta as shown in table 8 _o2and desilication efficiency η _sto have carried out 100 bag mean value after treatment.

As shown in table 8, in refining treatment, in the case of continuous moving impeller 10 in the scope that meets formula (12), desiliconization oxygen efficiency eta _o2and desilication efficiency η _scan reach more than 50%, the greatest wear amount S that simultaneously makes 100 iron clad water flow out refractory body is afterwards not enough 200mm.Waste is all below 57%.(embodiment 1～10).

On the other hand, in the scope that does not meet formula (12), fixing impeller 10 carries out refining treatment, desiliconization oxygen efficiency eta _o2and desilication efficiency η _sless than 50%, more than the greatest wear amount S of the refractory body after simultaneously tapping a blast furnace reaches 200mm, abrasion loss substantially exceeds 57%.(comparative example 12).

, in the time that molten iron is carried out to refining, by impeller 10 is moved in the mode that meets formula (12) along molten iron stream, the loss of refractory body part can be prevented according to the present invention above, the efficiency of refining treatment can be improved simultaneously.

4. the 4th embodiment

The following describes the blast furnace tapping floor equipment based on four embodiment of the invention viewpoint.

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

At this, illustrate that the preparation in the continuous refining of the molten iron carrying out at blast furnace tapping floor 1 throws in the suitable allocation position of spray gun 17, to the suitable point of addition of the refining agent of molten iron.

Figure 31 is the front elevation 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 formed.Hopper 45 is fixed in the stand 81 above that is fixed on base 52.Movable pipe 80 connects cutting portion and preparation is thrown 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 cutting portion 46, via the conveying of throwing in the refining agent of the transfer lime of spray gun 17 to preparation, the drop that utilizes cutting portion 46 and preparation to throw between spray gun 17 carries out, and hopper 45 is installed in the sufficiently high position of stand 81.

Base portion 52 can be thrown in preparation spray gun 17 and is fixed on 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 change to upstream side end edge and the downstream side end edge of base 52.

Embodiment 5

Various changes are carried out and carry out the refining treatment of molten iron in the position that the preparation of base 52 is thrown in to spray gun, and the appropriate location that the refining agent in the continuous refining of the molten iron carrying out at blast furnace tapping floor 1 is added is studied.

Table 9 is as a refining unit 100 of research and the summary of blast furnace tapping floor 1, and table 10 is to be 5FeO-58Fe as refining agent use desiliconization agent ₂o ₃-21CaO-8SiO ₂(in mass%), the condition of desiliconization processing of carrying out and the relation of result thereof.Figure 33 is by the refining agent point of addition figure representing with the relation of impeller 10 in table 10, and Figure 34 is refining agent point of addition and the desiliconization oxygen efficiency eta representing in table 10 _o2between the figure of relation.

The various conditions of the whipping appts 11 in table 10 are the eddy current of molten iron that obtain, that produced by impeller 10 before the suitable position of adding at research refining agent agitation conditions to the width of iron notch 4 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 the present inventors use the impeller of the diameter that meets 0.3≤d/D < 1, in the scope of rotating speed 80～200rpm, carry out many experiments, confirmed to be all diffused on the whole at the eddy current of molten iron the width of iron notch 4.

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

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

Table 9

The test portion extracting according to the position P1 at Figure 32 has been determined the silicone content of the molten iron flowing out from the blast furnace of table 10, and the test portion extracting according to the position P2 at Figure 32 has been determined the silicone content of desiliconization molten iron after treatment.

The same with above-mentioned the first embodiment, add as representing the index that the desiliconization agent of molten iron is helped the validity band of desilication reaction to, use suc as formula the desiliconization oxygen efficiency η shown in (5) _o2, in addition, add as representing the index that the sweetening agent of molten iron is helped the validity band of desulphurization reaction to, use suc as formula the desilication efficiency η shown in (6) _s.

In addition, in the comprehensive evaluation of table 10 desiliconization processing, by desilication efficiency η _o2be decided to be more than this taking 50% as boundary good ("○"), below this, be decided to be bad ("×").

In the refining of stirring by mechanicalness as existing, in the case of comparing with identical unit consumption, desiliconization oxygen efficiency η _o2be 30～40%.In view of this, first by desiliconization oxygen efficiency η _o2for the high efficiency benchmark that more than 50% is decided to be.In this case, the silicon while tapping a blast furnace is 0.38～0.42mass%, and silicon after treatment is below 0.25mass%.

By by desiliconization oxygen efficiency η _o2benchmark be decided to be more than 50%, can improve the efficiency (shorten desulfurization time, improve desulfurization amount) of the desulfurization processing of carrying out in the subsequent handling of this processing.

As shown in the table 10 and Figure 33 having arranged as desiliconization result has been carried out, the eddy flow being produced by impeller 10 at longitudinal (left and right directions (directions X) in Figure 33) component of iron notch vertical with molten iron flow direction or with the top of the molten iron in the region (in Figure 33 region more top than rotation axis 15) of molten iron flow opposite direction, at the horizontal throw M of the interpolation Kou29 center of spray gun 17 (preparation throw in) from impeller shaft center to point of addition, in upstream side 0 < M/D≤0.5 o'clock of spindle central, in downstream side 0 < M/D≤0.8 o'clock, by desiliconization oxygen efficiency η _o2be decided to be more than 50%.

Why different with downstream side at upstream side to the scope of the distance M of point of addition from carrying out the impeller shaft center of good desiliconization processing, because as shown in Figure 35 (a), the stirring eddy current producing because of the rotation of impeller 10, due to the mobile downstream side of being partial to of molten iron, makes downstream side one side aspect involving in, become the cause of favourable condition.

By sweetening agent in the situation that upstream side adds by above-mentioned scope, most cases is that sweetening agent can not involved in together but swim in and on molten iron, directly flow to downstream side along with stirring eddy current, in addition, even if being involved in, desiliconization agent stirs eddy current while floating, also be easy at molten iron stream and stir the overlapping position of stream depart from from stirring eddy current, because contacting deficiently and flow to downstream side with molten iron.

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

The impeller 10 rotating molten iron stream around, produce from the downstream side of impeller 10 and flowing flowing to upstream side contrary direction with molten iron in the mode as shown in Figure 35 (a), (b), if make sweetening agent colleague in this flows, desiliconization agent contributes to time of reaction elongatedly to add impeller 10 to from sweetening agent and rotate 1/4～1/2 time quantum, is also favourable on reaction efficiency.Therefore,, if the value of the distance M from impeller shaft center to point of addition is identical, preferably add sweetening agent at downstream side.

In the present invention, the optimum range of desiliconization agent interpolation being defined as at the upstream side of spindle central is 0 < M/D≤0.5, is 0 < M/D≤0.8 at downstream side.

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

In the above-described embodiment, use cruciform (four blades) as impeller 10, impeller 10 has been invaded in molten iron completely.Can stop in impregnating depth arbitrarily at lifting device 11.As long as making iron notch D entirety produce the condition that stirs eddy current, just do not limit especially shape, the rotating speed etc. of impeller 10.

Near being mixing position at preparation input spray gun 17, a refining unit can be made to X shown in figure 32, the formation that Y-direction can move freely.

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

In the above-described embodiment, use the desiliconization processing of desiliconization agent although the description of one of refining agent as molten iron is carried out to refining, but be also the same in the situation that uses sweetening agent.; what the present invention was represented is; by refining agent is involved in molten iron effectively; make the reaction interface area of refining agent and molten iron become large; for improving the optimum device of speed of response; even process equally as desulfurization processing with desiliconization, do not rely on the kind of refining agent and composition yet and make refining characteristic equally high.

The feasibility of applying in industry

The present invention can be applicable to the method that the molten iron to flowing out from blast furnace carries out refining continuously.

Claims (1)

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

The eddy current being produced by described impeller the length direction component of described iron notch and described molten iron flow direction is orthogonal or with the region of described molten iron flow opposite direction in, refining agent is added at least any position in following position,

(I) is in the position that meets formula (15b) of the upstream side of described impeller

(II) is in the position that meets formula (15) of the downstream side of described impeller

0＜M/D≤0.5 …(15b)

0＜M/D≤0.8 …(15)

Wherein,

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

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