CN106987677A - A kind of method that iron loss is smelted in dephosphorization clinker foamed reduction - Google Patents
A kind of method that iron loss is smelted in dephosphorization clinker foamed reduction Download PDFInfo
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- CN106987677A CN106987677A CN201710253582.8A CN201710253582A CN106987677A CN 106987677 A CN106987677 A CN 106987677A CN 201710253582 A CN201710253582 A CN 201710253582A CN 106987677 A CN106987677 A CN 106987677A
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- dephosphorization
- converter
- clinker
- slag
- steel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
- C21C2005/366—Foam slags
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses the method that iron loss is smelted in a kind of reduction of dephosphorization clinker foamed, belong to converter steeling technology field.The method of iron loss is smelted in a kind of dephosphorization clinker foamed reduction of the present invention, molten iron is first added into converter, foaming agent is then added into converter in the converter dephosphorization phase, the foaming agent include bauxite, the dephosphorization phase terminate after bottom-blowing of converter intensity is adjusted to 0.2~0.4Nm3/ min/t steel, by bottom blowing so that stove foamed, calm before converter deslagging to keep 10~30s to pour out dephosphorized slag again.The present invention enters is used as foaming agent by adding bauxite, improve the slag state after dephosphorization and composition, and control bottom-blowing of converter intensity to make clinker foamed, the iron shot in clinker can be made to be separated with clinker, it can be reduced the iron loss in dephosphorizing process, iron shot content in slag is greatly reduced, and then reduces steel technology.
Description
Technical field
The present invention relates to converter steeling technology field, reduce and smelt more specifically to a kind of dephosphorization clinker foamed
The method of iron loss.
Background technology
In recent years, in face of market environment with keen competition, in order to reduce production cost, competitiveness, domestic steel enterprise are improved
Industry starts MURC (Multi-refining Converter) pneumatic steelmaking work of experimental study nippon company in succession
Skill-" double slags+stays slag " smelting process, " double slags+stay slag " smelting process flow is：Add steel scrap, be blended into molten iron → converter take off
Slag is stayed in silicon, dephosphorization → row's early stage dephosphorized slag → blowing decarburization heating → converter tapping →.The technique divides conventional converter smelting
For 2 stages.1st stage (early stage) was substantially carried out desiliconization, dephosphorization treatment, and desiliconization, dephosphorization terminate rear grate and pour out part high phosphorus
The clinker of content, then carries out the blowing of the 2nd stage (later stage), goes out after being substantially carried out decarburization heating and part dephosphorization, finishing blowing
Steel, and by clinker stay in stove for next stove smelt use, next stove loads steel scrap, molten iron, Ran Houchong in the case where staying slag
The blowing of the 1st and the 2nd stage is carried out again, and is moved in circles with this.
The main purpose in wherein the 1st stage is high efficiency dephosphorating, traditional converter smelting using high alkalinity high oxidative clinker come
Dephosphorization, in order to reduce slag material consumption and enable early stage clinker smoothly to discharge, " double slags+stay slag " smelting process early stage master
Low alkalinity clinker is used, using this low favourable thermodynamic condition of early stage molten iron temperature, using the big oxygen supply intensity of low rifle position
Smelt, high efficiency dephosphorating is realized in the short time, smelted yet with using the big oxygen supply intensity of low rifle position, iron shot content significantly rises in slag
Height, adds smelting iron loss, increases production cost.
Institute is examined through patent, existing similar patent is disclosed.For example：The A of Chinese patent CN 102212643 disclose " one
Plant converter less-slag melting technique " (application number：201110148903.0 the applying date：2011-06-03), during bessemerizing
Reclaim decarbonized slag, dephosphorization phase and the high dephosphorization rate of carbon period, pour out the high dephosphorized slag of phosphorus content, reduction converter lime can be reached
Consumption, the purpose of reduction steel technology；Although metal charge consumption can be reduced, not from basic to a certain extent
Reduce iron loss.
In addition, the A of Chinese patent CN 103243192 disclose " a kind of lower basicity dephosphorized slag rapidly and efficiently dephosphorization turn
Stove smelting process " (application number：201310176151.8 the applying date：2013-05-14), the patent it is main by using low rifle position,
High oxygen supply intensity blows technology, strengthens top blast oxygen stream to the stirring in molten bath to realize high efficiency dephosphorating, but low rifle position big flow
Operation also brings slag iron and is sufficiently mixed, the problem of slag is difficult to separation.
The content of the invention
1. the invention technical problem to be solved
The present invention is difficult to separate with clinker for the iron in slag during converter dephosphorization in the prior art so that iron loss increases
Plus the problem of there is provided a kind of dephosphorization clinker foamed reduction smelt iron loss method, be used as foaming agent by adding bauxite, and
Control bottom-blowing of converter intensity makes clinker foamed, the iron shot in clinker can be made to be separated with clinker, it is possible to further reduce
Iron loss in dephosphorizing process.
2. technical scheme
To reach above-mentioned purpose, the technical scheme that the present invention is provided is：
The method of iron loss is smelted in a kind of dephosphorization clinker foamed reduction of the present invention, molten iron is first added into converter, then
Foaming agent is added into converter in the converter dephosphorization phase, the foaming agent includes bauxite, the dephosphorization phase terminate after by bottom-blowing of converter intensity
Adjust to 0.2~0.4Nm3/ min/t steel, by bottom blowing so that stove foamed, calm before converter deslagging to keep 10~30s again
Pour out dephosphorized slag.
Preferably, dephosphorization early stage adds solid particle additive into converter, add after solid particle additive again to
Foaming agent is added in converter, described solid particle additive includes 2CaOSiO2Solid particle, grain graininess≤1mm.
Preferably, solid particle additive, 3~3.5min of dephosphorization phase blowing are added in dephosphorization phase 2.5~3min of blowing
When add foaming agent.
Preferably, the addition of foaming agent is 2~5kg/t steel；The addition of solid particle additive is 5~14kg/t
Steel.
Preferably, converter dephosphorization phase clinker dual alkalinity is 1.2~1.8, in clinker FeO mass fractions be 10%~
25%, Al2O3Mass fraction is 3.0%~6.0%.
Preferably, described bottom blown gas is N2Or Ar.
Preferably, specific step is：
(a) stove, which is smelted, on taps and stays slag, and stays the quantity of slag to be 30~50kg/t steel；
(b) add molten iron into converter, then add into converter 0~16kg lime；
(c) solid particle additive is added into converter, foaming agent is then added into converter again；
(d) deslagging is carried out, and deslagging rate is 50~70%；
(e) control of carbon period oxygen supply intensity is 2.8~3.2Nm3/ min/ tons of steel, lime adding amount is 5~20kg/t steel,
It is 3.2~3.6 to regulate and control converter decarbonized slag dual alkalinity, bessemerizes and is tapped after end and stay slag.
Preferably, bath temperature is 1380~1420 DEG C when solid particle additive is added in step (c).
Preferably, calcined magnesite ball addition is that MgO mass fractions are 7.0% in 5~10kg/ ton steel, clinker in step (e)
~9.5%.
3. beneficial effect
The technical scheme provided using the present invention, compared with existing known technology, with following remarkable result：
(1) method of iron loss is smelted in a kind of dephosphorization clinker foamed of the invention reduction, in the converter dephosphorization phase into converter
Foaming agent is added, the foaming agent includes bauxite, adjustment bottom-blowing of converter intensity after the dephosphorization phase terminates, by bottom blowing so that stove foam
Change, calm before converter deslagging to keep pouring out dephosphorized slag again, control bottom-blowing of converter intensity makes clinker foamed, makes the iron in clinker
Pearl separates with clinker, and then reduces the iron loss in dephosphorizing process；
(2) method of iron loss is smelted in a kind of dephosphorization clinker foamed of the invention reduction, and dephosphorization early stage is added into converter
Solid particle additive, 2CaOSiO2Solid particle can be with dephosphorization product 3CaOP2O5The shape in very wide composition range
Into solid solution, 2CaOSiO2Solid particle can be enriched with the phosphorus in liquid phase clinker, reduce the content of phosphorus in liquid phase clinker, improve
Dephosphorization efficiency in converter steelmaking process, then into converter, addition foaming agent improves the slag state after dephosphorization and composition, changes
It has been apt to the mobility of clinker and the dynamics of later stage dephosphorization, has further improved the efficiency of dephosphorization；And foaming agent and solid solution
Body collective effect improves the characteristic of clinker, and then improves the foaming capacity of clinker, and iron shot content in slag is greatly reduced, makes
Steel technology reduces about 3~8kg/t steel.
Brief description of the drawings
Fig. 1 smelts the flow chart of the method for iron loss for a kind of dephosphorization clinker foamed reduction of the present invention.
Embodiment
Hereafter the detailed description to the exemplary embodiment of the present invention with reference to accompanying drawing, one of accompanying drawing formation description
Point, show enforceable exemplary embodiment of the invention as example in the figure.Although these exemplary embodiment quilts
Fully describe in detail to enable those skilled in the art to implement the present invention, it is to be understood that can realize other embodiment and
Can without departing from the spirit and scope of the present invention to the present invention various changes can be made.Hereafter to embodiments of the invention
More detailed description is not limited to required the scope of the present invention, and just to be illustrated and do not limit pair
The description of the features of the present invention and feature, to propose the best mode for performing the present invention, and is sufficient so that those skilled in the art
The present invention can be implemented.Therefore, the scope of the invention is only defined by the appended claims, hereafter detailed description of the present invention
It can be more fully understood with example embodiment with reference to accompanying drawing.
Embodiment 1
The present embodiment experiment is carried out on 150 tons of top and bottom combined blown converters, using " double slags+stay slag " smelting process, including with
Lower step；Add steel scrap, be blended into molten iron, bessemerize desiliconization, dephosphorization, the dephosphorization phase terminate after adjust bottom blowing intensity, treat that clinker fills
After distribution bubble, dephosphorized slag, carries out decarburization, tapping, and stay slag afterwards.The solid particle additive of the present invention includes 2CaO
SiO2Solid particle, grain graininess≤1mm.
As shown in figure 1, the method for iron loss, including following step are smelted in a kind of dephosphorization clinker foamed reduction of the present embodiment
Suddenly：
(a) stove, which is smelted, on taps and stays slag, stays quantity of slag 7866kg, then adds 3-5kg/t steel lime stones and carry out residue adjustment, excellent
The lime stone of 4kg/t steel is selected, so as to make clinker fully solidify using decomposition of limestone heat absorption；
(b) metal charge is added into converter, and metal charge is made up of molten iron and steel scrap, and its mass percent is：Molten iron
89.34%, steel scrap 10.66%, metal charge is than as shown in table 1；The composition of molten iron is as shown in table 1；And it is true according to molten iron silicon content
Determine dephosphorization phase phase lime adding amount, when entering w [Si]≤0.3% in stove molten iron, be added without lime；Enter 0.3% ＜ w in stove molten iron
During [Si]≤0.6%, lime adding amount is 2~7kg/t steel；When entering 0.6% ＜ w [Si] in stove molten iron, lime adding amount be 7~
16kg/t steel；Iron ore addition is 0~35kg/t steel, and specific addition is shown in Table 2；Due in the molten iron of the present embodiment
0.3% ＜ w [Si]=0.35%≤0.6%, then lime adding amount is 3.6kg/t steel, as shown in table 2；
The converter smelting heat metal charge condition of table 1
Table 2 bessemerizes desiliconization, dephosphorization phase technological parameter
(c) 0-2min of converter dephosphorization phase is operated using high rifle position big flow, and rifle position is 1.90m, and oxygen supply intensity control is
3.2Nm3/ min/t steel；Using the operation of low rifle position low discharge after dephosphorization phase blowing 2min, rifle position is 1.57m, oxygen supply intensity control
For 1.92Nm3/ min/t steel, when the dephosphorization phase blows to 3min, bath temperature is 1380~1420 DEG C, adds 2CaOSiO2Solid
Particle 6.2kg/t steel (as shown in table 3), while bottom-blowing of converter intensity is adjusted to 0.16Nm3/(min·t)；Converter is controlled to take off
Phosphorus phase clinker dual alkalinity is 1.2~1.8, preferably 1.38 (as shown in table 3), and FeO mass fractions are 10% in dephosphorization phase clinker
~25%, the present embodiment is 15%, grain graininess≤1mm of solid particle additive, herein it is significant to note that, solid
The addition opportunity of particulate additive is particularly important, and dephosphorization dynamics can be influenceed if temperature is too high so that dephosphorization effect deteriorates,
Cause the viscosity increase in slag if temperature is too low so that mass transfer of the dephosphorization product in slag is obstructed, so as to influence phosphorus oxidation
Thing enters clinker, and then influences dephosphorization effect.Foaming agent is added during dephosphorization phase 3~3.5min of blowing, the present embodiment is 3.5min
When add foaming agent, the foaming agent is bauxite, and the addition of foaming agent is 2~5kg/t steel；And will turn after the dephosphorization phase terminates
Stove bottom blowing intensity is adjusted to 0.2~0.4Nm3/ min/t steel, wherein bottom blown gas are N2, the present embodiment is 0.2Nm3/ min/t steel
(as shown in table 2), by bottom blowing so that stove foamed.The mass percent of the composition of bauxite is：Al2O3：75%, SiO2：
5%, TFe：10%, remaining is impurity.
3 dephosphorization phase of table clinker and molten iron situation
(d) dephosphorization phase blowing 6min carries out deslagging, and the dephosphorization phase terminates before converter deslagging, and bottom-blowing of converter gas is not closed,
Calmness keeps 10~30s to pour out dephosphorized slag again, the present embodiment 15s, and it is 50~70% control deslagging rate, and the present embodiment is 63%.
The converter smelting index of table 4
(e) control of carbon period oxygen supply intensity is 2.8~3.2Nm3/ min/ tons of steel, preferably 2.8Nm3/ min/ tons of steel, lime adds
Enter amount for 15-25kg/t steel, preferably 23.9kg/t steel, calcined magnesite ball addition is 6.5kg/t steel, converter decarbonized slag dual alkalinity
For 3.41；MgO mass fractions are tapping after 9.7% (as shown in table 4), stove finishing blowing in clinker, and converter tapping is stayed after terminating
Slag；Converter smelting index after the completion of smelting is as shown in table 4.
Embodiment 1 is compared to traditional " double slag process " technique, and its advantage, which is mainly reflected in, to be significantly reduced converter slag-making material and disappear
Consumption, steel technology and end phosphorus content, and significantly improve dephosphorization phase dephosphorization rate；Dephosphorization phase average dephosphorization rate from
56.06% brings up to 70.45%, and end phosphorus content is reduced to 0.013% from 0.017%.And compared to " double slags of common process
+ stay slag " technique, significantly improve dephosphorization phase dephosphorization rate and reduce iron shot content in end phosphorus content, and slag by
40.1% is reduced to 4.5%.Steel technology is reduced to 1072.2kg/t by 1079.8kg/t steel.
In addition, the innovation and creation in compared with prior art：A kind of Dephosphorising agent and its application (ZL201410534612.9), though
So the patent proposes the multiphase slag body that solid phase/liquid phase coexists is formed at a temperature of 1300 DEG C~1400 DEG C after Dephosphorising agent melting
System, wherein solid phase is 2CaOSiO2Thing phase, the thing can mutually provide the place of enrichment for the phosphorus aoxidized in molten iron, so as to improve
The effect of dephosphorization.But, due to the 2CaOSiO2Thing is mutually by by various ingredients (such as FeOt, CaO, SiO2、Na2O、
Al2O3), by complicated chemical reaction in pyroprocess, and form in dephosphorized slag 2CaOSiO2Thing phase, so as to be phosphorus
Oxide provide enrichment place, improve the efficiency of dephosphorization.But the 2CaOSiO during being somebody's turn to do2Thing is mutually by multiple
Miscellaneous high-temperature chemical reaction production, dephosphorization effect and 2CaOSiO2The generation situation of thing phase is closely bound up, 2CaOSiO2Thing
The generation situation of phase directly affects dephosphorization effect.Therefore applicant proposed 2CaO is added during converter dephosphorization
SiO2As solid particle additive, 2CaOSiO in dephosphorized slag is eliminated2In the generating process of thing phase, expect to improve dephosphorization effect
Rate.But, in further research process, inventor has been found that simply adds 2CaOSiO during dephosphorization2Make
For solid particle additive, dephosphorization effect can not be not only improved, the dephosphorization effect of molten iron can be deteriorated on the contrary, therefore be not de-
2CaOSiO is added during phosphorus2As solid particle additive with regard to that can improve dephosphorization efficiency, this is existing technical staff
Why not the main cause of Dephosphorising agent is done using addition solid particle.
Further inventor is had surprisingly found that in research process, and solid is added during the difference in the dephosphorization phase
Grain additive dephosphorization effect has notable difference, and solid particle additive adds early or adds evening all dephosphorization effect will be deteriorated,
By tissue, repeatedly investigation will be considered that reaction mechanism therein is probably to inventor：
One, when solid particle additive adds too early, the phosphorus in molten iron is not yet by the efficient oxidation, solid particle addition
The addition of agent make it that the viscosity in slag is larger, the P that the later stage is oxidized2O5Mass transfer in slag is obstructed so that the P of oxidation generation2O5
It is difficult to by being sent in molten iron in dephosphorized slag so that dephosphorization effect deteriorates；
Secondly, when solid particle additive add too late when so that slagging speed of the solid particle in slag is relatively slow,
So as to miss optimal dephosphorization opportunity, because duration of blast is relatively long, largely oxidation make it that the temperature in molten bath is higher to C, makes
Obtain dephosphorization effect poor；
Therefore, this is why existing technical staff does not select to be directly added into 2CaOSiO2Solid particle, and pass through
Multiple kinds of components (such as FeOt, CaO, SiO2、Na2O、Al2O3) form 2CaOSiO by complicated chemical reaction2Thing phase.It is logical
Prolonged numerous studies are crossed, inventor is creative to be proposed when bessemerizing 2.5-3min, adds solid
2CaO·SiO2It is used as solid particle additive, 2CaOSiO2Solid particle melts in slag and generates 2CaOSiO2Thing phase；
Phosphorus in this molten bath oxidized in period and generates 3CaOP2O5, and now clinker has relatively good mobility, from
And cause the 3CaOP in molten bath2O5Entered by mass transfer in slag；Reduce P in ambient liquid phase clinker2O5Content, is accelerated de-
Phosphorus reaction, improves dephosphorization rate.The lucky CaOSiO in bath temperature2Can be with dephosphorization product 3CaOP2O5Very wide
Solid solution, 2CaOSiO are formed in composition range2Solid particle plays a part of phosphorus in enrichment liquid phase clinker, reduces liquid phase
The content and concentration of phosphorus, accelerate the 3CaOP in molten bath in clinker2O5Mass transfer into slag, and then accelerate dephosphorisation reaction.
In order to increase the mixing effect in molten bath during existing dephosphorization, big flow is usually used during dephosphorization
Oxygen-supply operation, so as to increase mixing effect, and causes the 3CaOP in molten bath2O5Mass transfer into slag.And the hair of present application
A person of good sense but breaks the inertial thinking of prior art, using low discharge oxygen supply system, and adjusts bottom blowing intensity for 0.16Nm3/
(mint), so as to ensure that 3CaOP2O5Rapid mass transfer into slag, if anti-using the oxygen supply system of big flow herein
Should.And be first 1.92Nm by oxygen supply intensity control before solid particle additive is added3/ min/t steel, and kept for a period of time
After add solid particle, it is ensured that the P in molten bath proceeds by oxidation, avoids C from largely aoxidizing again, add solid particle additive
Avoid the viscosity of slag larger afterwards, good dynamics is provided for dephosphorization；And control the dephosphorization phase clinker dual alkalinity that blows, it is ensured that
2CaO·SiO2Can be with dephosphorization product 3CaOP2O5Solid solution is formed in very wide composition range, 3CaO is in turn ensure that
P2O5Rapid mass transfer into slag, so as to improve the efficiency of dephosphorization.
In addition, lime adding amount, calcined magnesite ball are further added；Regulation converter decarbonized slag dual alkalinity be
Content of MgO is 7.0%~10.0% in 3.0~4.0, and working the slag so that there is clinker suitable dual alkalinity and MgO to contain
Amount, and then the decarbonized slag in decarbonizing process is controlled, it is that later stage dephosphorization is laid a good foundation to adjust to suitable position, can improve and turn
Dephosphorization efficiency in stove smelting process.
Applicant has found that slag viscosity is big under cryogenic by long-term research, and iron shot is difficult to sink in slag, slag
It is difficult to efficiently separate, most of iron shot is poured out with clinker when arranging pre-slag so that smelting process steel technology is big
Width increase；Accelerate decarburizing reaction progress again when the temperature increases, violent reaction between carbon and oxygen makes iron shot content in slag significantly raise,
And enter iron shot in slag and reacted with FeO in slag, FeO contents in slag are reduced, slag viscosity is drastically raised, under iron shot is difficult in slag
It is heavy, again such that smelting process steel technology is significantly increased.The proposition of the invention, adds bauxite work in clinker
Promote slag to efficiently separate for additive, and control converter dephosphorization phase clinker dual alkalinity to be 1.2~1.8, in dephosphorization phase clinker
FeO mass fractions be 10%~25% cause clinker there is preferable foaming capacity, herein it is significant to note that, add hair
The purpose of infusion is not reduction of the viscosity of clinker, if simply reducing the viscosity of clinker, can enable the foaming of clinker
Power declines, and the effect of reduction iron loss is not reached on the contrary.At the same time bauxite is while working the slag performance, and its own is not
Reacted with iron shot in slag, and then reduce the consumption to metal；And by improving bottom blowing intensity so that stove foamed, reduction
The density reduction of clinker, and then increase the density difference between clinker and iron shot, makes to be more than more than 1mm iron shots and is kept in calmness
During be sink in molten steel, and then cause clinker efficiently separated with iron shot therein, reduce the iron loss in smelting process.
Embodiment 2
The substance be the same as Example 1 of the present embodiment, difference is：The solid particle additive of the present invention includes
2CaO·SiO2Solid particle and manganese ore, manganese ore grain graininess≤1mm, the mass percent of solid particle additive is 2CaO
SiO2Solid particle：90%, manganese ore：10%.Wherein, the composition of manganese ore is MnO2：50-53%, SiO2：5-7%；CaO：20-
22%, TFe：6-8%, remaining is impurity.Wherein foaming agent includes bauxite and kaolin, and the mass percent of foaming agent is：
Bauxite：90%, kaolin：10%.Manganese ore is reduction slag viscosity, reduces 2CaOSiO2Solid particle is added to clinker
The influence of viscosity, promotes phosphorus to be migrated from molten iron into slag, and then improves dephosphorization efficiency, and foaming agent adds with solid particle
Plus agent collective effect, the viscosity of clinker is further improved so that clinker has the foam performance more breathed out, and then reduces iron loss.
(a) stove, which is smelted, on taps and stays slag, stays the quantity of slag as shown in table 2, then adds 3-5kg/t steel lime stone to adjust
The lime stone of slag, preferably 3kg/t steel；
(b) metal charge is added into converter, and metal charge is made up of molten iron and steel scrap, metal charge is than as shown in table 1；Molten iron
Composition it is as shown in table 1；And dephosphorization phase phase lime adding amount is determined according to molten iron silicon content, enter w [Si]=0.24 in stove molten iron
When≤0.3%, lime is added without, as shown in table 2；
(c) 0-2min of converter dephosphorization phase is operated using high rifle position big flow, and low rifle position is used after dephosphorization phase blowing 2min
Low discharge is operated, when the dephosphorization phase blows to 2min, adds 2CaOSiO2Solid particle 5.1kg/t steel (as shown in table 2)；Control
FeO mass fractions are as shown in table 3 in converter dephosphorization phase clinker dual alkalinity, clinker；Hair is added during dephosphorization phase 3~3.5min of blowing
Infusion, the present embodiment adds foaming agent when being 3min, addition, the bottom-blowing of converter intensity of foaming agent are as shown in table 2, wherein bottom blowing
Gas is Ar, by bottom blowing so that stove foamed.
(d) dephosphorization phase blowing 6min carries out deslagging, and the dephosphorization phase terminates before converter deslagging, and calmness keeps 10s, controls deslagging
Rate is 50~70%, and the present embodiment is 70%；
(e) control of carbon period oxygen supply intensity is 2.8~3.2Nm3/ min/ tons of steel, preferably 3.0Nm3/ min/ tons of steel, lime adds
Enter amount for 15-25kg/t steel, preferably 24.5kg/t steel, MgO in calcined magnesite ball addition, converter decarbonized slag dual alkalinity, clinker
Mass fraction as shown in table 4, is tapped after stove finishing blowing, and converter tapping stays slag after terminating；Converter smelting after the completion of smelting refers to
Mark is as shown in table 4.
Embodiment 3
The substance be the same as Example 1 of the present embodiment, difference is：The solid particle additive of the present invention includes
2CaO·SiO2Solid particle, manganese ore and portland cement, its granularity≤1mm, the mass percent of solid particle additive is
2CaO·SiO2Solid particle：80%, manganese ore：10%, portland cement：10%.Wherein foaming agent includes bauxite, kaolin
And mullite, the mass percent of foaming agent is：Bauxite：90%, kaolin：8%, mullite：2%.Solid particle is added
The component reduction slag viscosity of agent, promotes phosphorus to be migrated from molten iron into slag, and then improve dephosphorization efficiency, and and foaming agent
Collective effect, further improves the viscosity of clinker so that clinker has the foam performance more breathed out, and then reduces iron loss.
(a) stove, which is smelted, on taps and stays slag, stays the quantity of slag as shown in table 2, then adds 3-5kg/t steel lime stone to adjust
The lime stone of slag, preferably 5kg/t steel；
(b) metal charge is added into converter, and metal charge is made up of molten iron and steel scrap, metal charge is than as shown in table 1；Molten iron
Composition it is as shown in table 1；And dephosphorization phase phase lime adding amount is determined according to molten iron silicon content, enter 0.3% in stove molten iron<w[Si]
=0.45≤0.6, lime adding amount is 6.2kg, as shown in table 2；
(c) 0-2min of converter dephosphorization phase is operated using high rifle position big flow, and low rifle position is used after dephosphorization phase blowing 2min
Low discharge is operated, when the dephosphorization phase blows to 2min, adds 2CaOSiO2Solid particle 7.9kg/t steel (as shown in table 2)；Control
FeO mass fractions are as shown in table 3 in converter dephosphorization phase clinker dual alkalinity, clinker；Foaming is added during dephosphorization phase blowing 3.5min
Agent, addition, the bottom-blowing of converter intensity of foaming agent is as shown in table 2, and wherein bottom blown gas is Ar, by bottom blowing so that stove foam
Change.
(d) dephosphorization phase blowing 6min carries out deslagging, and the dephosphorization phase terminates before converter deslagging, and calmness keeps 20s, controls deslagging
Rate is 50~70%, and the present embodiment is 60%；Time difference between deslagging and foaming agent should be greater than 2min；
(e) control of carbon period oxygen supply intensity is 2.8~3.2Nm3/ min/ tons of steel, preferably 3.1Nm3/ min/ tons of steel, lime adds
Enter amount for 15-25kg/t steel, preferably 19.7kg/t steel, MgO in calcined magnesite ball addition, converter decarbonized slag dual alkalinity, clinker
Mass fraction is as shown in table 4, is tapped after stove finishing blowing, and converter tapping stays slag after terminating；Converter smelting after the completion of smelting
Index is as shown in table 4.
Embodiment 4
The substance be the same as Example 1 of the present embodiment, difference is：The solid particle additive of the present invention includes
2CaO·SiO2Solid particle, manganese ore, portland cement, wolframite, its granularity≤1mm, the quality hundred of solid particle additive
Divide than being 2CaOSiO2Solid particle：80%, manganese ore：10%, portland cement：5% and wolframite：5%.
(a) stove, which is smelted, on taps and stays slag, stays the quantity of slag as shown in table 2, then adds 3-5kg/t steel lime stone to adjust
The lime stone of slag, preferably 3kg/t steel；
(b) metal charge is added into converter, and metal charge is made up of molten iron and steel scrap, metal charge is than as shown in table 1；Molten iron
Composition it is as shown in table 1；And dephosphorization phase phase lime adding amount is determined according to molten iron silicon content, enter 0.6% in stove molten iron<w[Si]
=0.70, lime adding amount is 15.6kg, as shown in table 2；
(c) 0-2min of converter dephosphorization phase is operated using high rifle position big flow, and low rifle position is used after dephosphorization phase blowing 2min
Low discharge is operated, when the dephosphorization phase blows to 2min, adds 2CaOSiO2Solid particle 13.5kg/t steel (as shown in table 2)；Control
FeO mass fractions are as shown in table 3 in converter dephosphorization phase clinker dual alkalinity processed, clinker；Hair is added during dephosphorization phase blowing 3.2min
Infusion, addition, the bottom-blowing of converter intensity of foaming agent is as shown in table 2, and wherein bottom blown gas is N2, by bottom blowing so that stove foam
Change.
(d) dephosphorization phase blowing 6min carries out deslagging, and the dephosphorization phase terminates before converter deslagging, and calmness keeps 20s, controls deslagging
Rate is 50~70%, and the present embodiment is 63%；Time difference between deslagging and foaming agent should be greater than 2min；
(e) control of carbon period oxygen supply intensity is 3.0Nm3/ min/ tons of steel, lime adding amount is 15-25kg/t steel, preferably
As shown in table 4, stove blows MgO mass fractions in 15.2kg/t steel, calcined magnesite ball addition, converter decarbonized slag dual alkalinity, clinker
Refining is tapped after terminating, and converter tapping stays slag after terminating；Converter smelting index after the completion of smelting is as shown in table 4.
The present invention is described in detail above in conjunction with specific exemplary embodiment.It is understood, however, that can not take off
Various modifications and variations are carried out in the case of from the scope of the present invention being defined by the following claims.Detailed description and drawings
Should be to be considered only as it is illustrative and not restrictive, if there is any such modifications and variations, then they all will
Fall into the scope of the present invention described here.In addition, background technology is intended to illustrate the Development Status and meaning of this technology,
It is not intended to limit the application field of the present invention or the application and the present invention.
Although more specifically, have been described herein the present invention exemplary embodiment, the invention is not limited in
These embodiments, but including those skilled in the art according to above detailed description it can be appreciated that it is modified, omit,
Any and whole embodiments of (such as between each embodiment) combination, adaptive change and/or replacement.In claim
Restriction can widely be explained according to the language used in claim, and be not limited in foregoing detailed description or in reality
The example described during this application is applied, these examples are considered as nonexcludability.For example, in the present invention, term is " preferably
Ground " not exclusively, preferably, here it means that " but be not restricted to that ".It is in office where method or process claims
In any step for enumerating can perform and be not limited to the order proposed in claim in any order.Therefore, it is of the invention
Scope only should be determined by appended claims and its legal equivalents, rather than by descriptions and examples given above Lai
It is determined that.
Claims (9)
1. a kind of method that iron loss is smelted in dephosphorization clinker foamed reduction, it is characterised in that：Molten iron is first added into converter, then
Foaming agent is added into converter in the converter dephosphorization phase, the foaming agent includes bauxite, the dephosphorization phase terminate after by bottom-blowing of converter intensity
Adjust to 0.2~0.4Nm3/ min/t steel, by bottom blowing so that stove foamed, calm before converter deslagging to keep 10~30s again
Pour out dephosphorized slag.
2. the method that iron loss is smelted in a kind of dephosphorization clinker foamed reduction according to claim 1, it is characterised in that：Dephosphorization
Early stage adds foaming agent into converter again after solid particle additive, addition solid particle additive are added into converter, institute
The solid particle additive stated includes 2CaOSiO2Solid particle, grain graininess≤1mm.
3. the method that iron loss is smelted in a kind of dephosphorization clinker foamed reduction according to claim 2, it is characterised in that：De-
Solid particle additive is added during phosphorus phase 2.5~3min of blowing, foaming agent is added during dephosphorization phase 3~3.5min of blowing.
4. the method that iron loss is smelted in a kind of dephosphorization clinker foamed reduction according to claim 3, it is characterised in that：Foaming
The addition of agent is 2~5kg/t steel；The addition of solid particle additive is 5~14kg/t steel.
5. the method that iron loss is smelted in a kind of dephosphorization clinker foamed reduction according to claim 4, it is characterised in that：Converter
Dephosphorization phase clinker dual alkalinity is 1.2~1.8, and FeO mass fractions are 10%~25%, Al in clinker2O3Mass fraction is
3.0%~6.0%.
6. the method for iron loss, its feature are smelted in a kind of dephosphorization clinker foamed reduction according to claim any one of 1-5
It is：Described bottom blown gas is N2Or Ar.
7. the method that iron loss is smelted in a kind of dephosphorization clinker foamed reduction according to claim 6, it is characterised in that：Specifically
The step of be：
(a) stove, which is smelted, on taps and stays slag, and stays the quantity of slag to be 30~50kg/t steel；
(b) add molten iron into converter, then add into converter 0~16kg lime；
(c) solid particle additive is added into converter, foaming agent is then added into converter again；
(d) deslagging is carried out, and deslagging rate is 50~70%；
(e) control of carbon period oxygen supply intensity is 2.8~3.2Nm3/ min/ tons of steel, lime adding amount is 5~20kg/t steel, and regulation and control turn
Stove decarbonized slag dual alkalinity is 3.2~3.6, bessemerizes and is tapped after end and stay slag.
8. the method that iron loss is smelted in a kind of dephosphorization clinker foamed reduction according to claim 7, it is characterised in that：Step
(c) bath temperature is 1380~1420 DEG C when solid particle additive is added in.
9. the method that iron loss is smelted in a kind of dephosphorization clinker foamed reduction according to claim 7, it is characterised in that：Step
(e) calcined magnesite ball addition is that MgO mass fractions are 7.0%~9.5% in 5~10kg/ ton steel, clinker in.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111719032A (en) * | 2019-03-21 | 2020-09-29 | 本钢板材股份有限公司 | Converter less-slag smelting method |
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| CN102839251A (en) * | 2012-09-13 | 2012-12-26 | 首钢总公司 | Smelting method of low-phosphorous steel |
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| JP2016188423A (en) * | 2015-03-30 | 2016-11-04 | Ｊｆｅスチール株式会社 | Method for dephosphorizing and decarbonizing molten iron |
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| CN102839251A (en) * | 2012-09-13 | 2012-12-26 | 首钢总公司 | Smelting method of low-phosphorous steel |
| CN102965466A (en) * | 2012-11-21 | 2013-03-13 | 首钢总公司 | Technology for improving slag pouring quantity of converter in stage of dephosphorization |
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| CN111719032A (en) * | 2019-03-21 | 2020-09-29 | 本钢板材股份有限公司 | Converter less-slag smelting method |
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