CN104278124B - A kind of Dephosphorising agent and application thereof - Google Patents
A kind of Dephosphorising agent and application thereof Download PDFInfo
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- CN104278124B CN104278124B CN201410534612.9A CN201410534612A CN104278124B CN 104278124 B CN104278124 B CN 104278124B CN 201410534612 A CN201410534612 A CN 201410534612A CN 104278124 B CN104278124 B CN 104278124B
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Abstract
The present invention relates to a kind of Dephosphorising agent and application thereof；Belong to technical field of ferrous metallurgy。The Dephosphorising agent of present invention exploitation, solves that existing calcium oxide-based liquid iron pretreatment dephosphorizing agent dephosphorization efficiency is low, slag consumption big, contaminated environment, the problem that is unfavorable for comprehensive utilization of resources。The Dephosphorising agent that the present invention develops, includes following components by percentage to the quality: FeOt:25～50%, CaO:20～45%, SiO2: 15～30%, Na2O:2～10%, Al2O3: 3～12%。Forming the heterogeneous slag system that solid phase/liquid phase coexists after this molten iron dephosphorization agent is melted at 1300 DEG C～1400 DEG C temperature, wherein solid phase is 2CaO SiO2Thing phase, this thing is on good terms and is provided the place of enrichment into the phosphorus of oxidation in molten iron so that this Dephosphorising agent has the advantages that dephosphorization effect consumption good, slag is few, is entirely free of fluorine, environmental pollution is little and is conducive to dephosphorized slag to comprehensively utilize。
Description
Technical field
The present invention relates to a kind of Dephosphorising agent and application thereof；Belong to technical field of ferrous metallurgy。
Background technology
Phosphorus is easy to segregation in steel, is particularly susceptible to " cold short " phenomenon under cryogenic, affects the anisotropic of steel, thus reducing mechanical performance and the welding performance etc. of steel。Owing to phosphorus can not be removed in blast furnace reducing atmosphere, in subsequent process, its harm can not be eliminated again by heat treated mode, thus can only remove in steelmaking process。
Along with the intensification that iron and steel enterprise competes increasingly, high-phosphorus iron ore application percentage in blast furnace production process gradually steps up at a low price, makes the content of phosphorus in molten iron increase undoubtedly。Simultaneously along with the development of society, the quality of steel is had higher requirement by user, the petroleum pipeline of such as extremely frigid zones, natural gas line, offshore production platform, aviation steel and big cross section steel part etc., often require that the phosphorus content in steel is less than 0.01% even 0.005%。In order to produce the clean steel of low-phosphorous or ultralow phosphorus, metallargist is forced to have to more new technology or the technology phosphorus content to reduce in steel。
At present, in order to smelt low-phosphorous or ultra-low phosphoretic steel kind, molten iron before converter smelting is adopted pretreatment dephosphorizing, two classes can be divided into according to the difference of container, one class is to carry out dephosphorizing pretreatment in the hot-metal bottle containing molten iron or fish torpedo ladle, another kind of is carry out dephosphorizing pretreatment in special converter, and this two classes method industrially all has practical application。The molten iron dephosphorization agent of current application is mainly made up of Calx, fluorite and ferrum oxide etc., owing to raw material sources are extensive, and low price, apply comparatively general。
In order to reduce the cost of Dephosphorising agent, reduce the total amount of steelmaking slag, feature based on converter finishing slag high alkalinity high oxidative and vessel slag fritting itself, the compositions such as the Calx in conventional lime slag system Dephosphorising agent, ferrum oxide can be substituted completely and be used as molten iron dephosphorization agent use, technology about this respect has been reported: Chinese patent (application number 03115576.6, a kind of be raw material with vessel slag molten iron dephosphorization agent) disclose a kind of vessel slag, Calx, iron oxides, fluorite, soda, limestone preparation Dephosphorising agent；Chinese patent (application number 20091010366.9, the compound dephosphorization agent and preparation method thereof being raw material with vessel slag) discloses the Dephosphorising agent of a kind of vessel slag, quartz sand, steel rolling iron sheet, bauxite, soda, fluorite preparation；Chinese patent (application number 201210439016.3, a kind of low cost fritting Dephosphorising agent) discloses the fritting Dephosphorising agent of a kind of converter waste residue, dedusting ash, refining slag, active lime, fluorite preparation。These Dephosphorising agents all have employed vessel slag as raw material, but Shortcomings, because vessel slag all contains a certain amount of P2O5, dephosphorizing capacity is limited, during for molten iron pretreatment, need to add active lime and ferrum oxide, to ensure Dephosphorising agent dephosphorizing capacity thermodynamically, and owing to molten iron pretreatment temperature is low, vessel slag fusing point and Calx fusing point are high, need with addition of reducing slag melting point, the flux of promotionization slag, improve the efficiency of dephosphorization, most use fluorites are as cosolvent at present, fluorine-containing harmful gas is discharged when with acidic materials effect in slag, harm site operation personnel's is healthy, and the fluorine in waste residue can dissolve in water after smelting, cause that in water, Oil repellent exceeds standard, polluted source and environment。Even some invention is furnished with a small amount of limestone, limestone decomposes heat absorption under molten iron pretreatment temperature, molten iron temperature can be made to decline, although favors low temperature is in dephosphorization in theory, but too low the being unfavorable for slag of temperature, reduce the efficiency of actual dephosphorization and the utilization rate of dephosphorized slag, and add to the difficulties seriously can to due to dry slag operation and subsequent treatment。
In recent years, in order to build a resource-conserving society, report the Dephosphorising agent being raw material with other field garbage, Chinese patent (application number 201110117960.2, a kind of liquid iron pretreatment dephosphorizing agent containing metal magnesium slag) discloses a kind of with magnesium slag, brium carbonate, converter mud, iron scale, fluorite, B2O3The Dephosphorising agent of preparation。This Dephosphorising agent is disadvantageous in that containing fluorite, can bring pollution, and environmental problem still exists。In addition, for built environment friendly society, a large amount of development clean metallurgy, consider the adverse effect that environment is brought by fluorite, Chinese patent (application number 200910263060.1, a kind of liquid iron pretreatment dephosphorizing agent) discloses the floride-free Dephosphorising agent of a kind of converter finishing slag, active lime, ferrum oxide, boric anhydride preparation。Chinese patent (application number 200910273109.1, fluorine-free molten iron dephosphorization agent) discloses a kind of by the oxide of ferrum, CaO, B2O3, MgO preparation fluorine-free molten iron dephosphorization agent。Although this Dephosphorising agent does not contain fluorine and B2O3Effect of fluxing is obvious, not only free from environmental pollution, and the dephosphorized slag after dephosphorization contains phosphorus and the boron element of high level, it is a desirable boron phosphorus composite chemical fertilizer after treatment, will not contaminated soil and water resource, the comprehensive utilization of high added value can be realized, but the use of a large amount of boron can make boron element remain in molten iron, the quenching degree of appreciable impact steel。
In sum, molten iron dephosphorization agent by traditional single effect to diversification role transformation, should make overall plans from now on, develop a kind of liquid iron pretreatment dephosphorizing agent, this Dephosphorising agent not only consumption is few, applied widely, free from environmental pollution and be detrimental to health, and phosphorus deep removal can be realized efficiently, effectively phosphorus can be enriched with again, if dephosphorization finishing slag is carried out suitable process, the phosphorus of enrichment is separated from dephosphorization finishing slag, the phosphorus so separated can serve as the substitute of phosphate rock resource, residue then can return to utilization, so, not only fundamentally decrease the generation of metallurgical slag, and adequately achieve the maximization of secondary resource comprehensive utilization benefit。
Summary of the invention
It is an object of the invention to provide a kind of without fluorite, environmental friendliness, high financial profit, the Dephosphorising agent not being detrimental to health and application thereof。
One Dephosphorising agent of the present invention；Include following component by percentage to the quality:
FeOt: 25～50%, it is preferred to 30～45%, more preferably 35～40%；
CaO:20～45%, it is preferred to 25～40%, more preferably 30～40%；
SiO2: 15～30%, it is preferred to 15～25%, more preferably 18～22%；
Na2O:2～10%, it is preferred to 3～8%, more preferably 4～6%；
Al2O3: 3～12%, it is preferred to 4～10%, more preferably 5～7%。
One Dephosphorising agent of the present invention；Described FeOt is selected from FeO, Fe2O3、Fe3O4In at least one。
One Dephosphorising agent of the present invention；When FeOt is selected from Fe2O3、Fe3O4In at least one time, with Fe2O3And/or Fe3O4In Fe element for conversion benchmark, by Fe2O3And/or Fe3O4After being converted into FeO, add in Dephosphorising agent。
One Dephosphorising agent of the present invention；Described FeOt allocates in Dephosphorising agent with the form of iron scale。
One Dephosphorising agent of the present invention；Described CaO adds in Dephosphorising agent with the form of Calx；It is preferably and adds in Dephosphorising agent with the form of active lime。
One Dephosphorising agent of the present invention；Described SiO2Add in Dephosphorising agent with the form of Silicon stone。
One Dephosphorising agent of the present invention；Na2O adds at least one in sodium oxide, sodium hydroxide, sodium carbonate, sodium bicarbonate of the form in Dephosphorising agent。It is preferably sodium carbonate and/or sodium bicarbonate。
One Dephosphorising agent of the present invention；Described Al2O3Add in Dephosphorising agent with the form of the oxide of aluminum and/or bauxite, it is preferred to add in Dephosphorising agent with the form of bauxite。
One Dephosphorising agent of the present invention；Formed with 2CaO SiO under 1300 DEG C～1400 DEG C conditions2Heterogeneous slag system for solid phase。
One Dephosphorising agent of the present invention；Its preparation method is:
Distribution is become to take mix homogeneously after each raw material by the Dephosphorising agent of design, it is subsequently placed in resistance furnace 1500 DEG C of fritting and is incubated 10min, again pre-melted slag is poured on the copper coin with cooling water and carries out chilling, finally it is broken into the powder that granularity is below 1.5mm (being preferably 0.6mm～1.2mm, more preferably 0.8mm～1.0mm) standby。
The application of a kind of Dephosphorising agent of the present invention；Its application includes the molten iron of Si content≤0.10wt% is carried out dephosphorizing pretreatment。
When Dephosphorising agent of the present invention is applied to the molten iron processing Si content≤0.10wt%, control temperature >=1300 DEG C, it is preferred to 1300-1400 DEG C.
When Dephosphorising agent of the present invention is applied to the molten iron processing Si content≤0.10wt%, add the Dephosphorising agent of 100kg～150kg by molten iron per ton。Its dephosphorization efficiency >=82%。
One molten iron dephosphorization agent of the present invention；Its application could be included for processing the metal smelt of Si content≤0.10wt%。
Principle and advantage
The Dephosphorising agent that the present invention develops, it is entirely free of fluorite, environmental friendliness, not being detrimental to health, when adopting this Dephosphorising agent dephosphorization, the consumption of slag reduces, dephosphorization effect is good, the P elements of elimination effectively can be enriched with simultaneously, be advantageously implemented the high value added utilization of dephosphorized slag, there is good social benefit, economic benefit and use value。
FeO in Dephosphorising agent of the present inventiontEffect have two aspects, be oxygen supply and transmission oxygen in molten iron on the one hand, the phosphorus oxygen in molten iron turned to P2O5；It is that namely the melting promoting Calx changes slag effect on the other hand。FeOtConsumption is unfavorable for oxidation and the slag making of phosphorus in molten iron very little, on the contrary, and FeOtThe too high badly damaged furnace lining of meeting of consumption。CaO and SiO in Dephosphorising agent of the present invention2Effect be in addition to outside liquid making phase slag, mainly by the two interaction formed 2CaO SiO2Solids phase, the enrichment for phosphorus provides place, and phosphorus enters liquid phase slag after slag ferrum interface aoxidizes and is diffused into 2CaO SiO2Thing phase surface reacts the enrichment phase forming phosphorus, i.e. 2CaO SiO2-3CaO·P2O5Solid solution。The present invention adds CaO with active lime, can quick dephosphorization slagging under the synergism of other components。
In Dephosphorising agent of the present invention, Na2O not only has an ability of phosphorus in oxidation molten iron, and can promote the melting of Calx, accelerates slagging, can also effectively reduce the viscosity of dephosphorization slag simultaneously, promotes phosphorus mass transfer in slag, and favourable phosphorus is to solid 2CaO SiO2Middle enrichment。The present invention strictly controls Na in Dephosphorising agent2The content of O, its reason is in that: Na2The too high levels of O, not only causes Na2A large amount of wastes of O, but also the dephosphorization efficiency of Dephosphorising agent can be affected；Na2The content of O is too low, then be unfavorable for slag making, affects phosphorus mass transfer in liquid phase slag simultaneously。
In Dephosphorising agent of the present invention, Al2O3Under the synergism of other components, particularly in Na2The melting of Calx, acceleration slagging can not only be promoted under the synergism of O, and improved the mobility of slag simultaneously, be advantageously implemented quick dephosphorization。
The present invention is by the strict composition controlling each component and consumption, under the synergism of each component, it is achieved that to the efficient removal of P elements in molten iron, and be simultaneously achieved effective enrichment of P elements。
Dephosphorising agent of the present invention is applicable to the dephosphorization of basic, normal, high various phosphorus contents ([P] < 0.8%) the saturated molten iron of carbon。Before dephosphorization molten iron should first pre-desiliconizing, Si content in molten iron is controlled at≤0.10wt%, and to control dephosphorization temperature is 1300 DEG C～1400 DEG C simultaneously, be so advantageously implemented the dephosphorization of high efficiency, high depth。
Advantage
1, the consumption of slag is few。Being the heterogeneous slag system of solid-liquid two-phase coexistent in 1300 DEG C～1400 DEG C temperature ranges after the phosphorus agent that the present invention develops is melted, wherein solid phase is 2CaO SiO2Phase。According to cohesion phase rule it can be seen that temperature is certain, the degree of freedom of system is 1, it was shown that FeOtConstant with the activity of CaO。When meaning to adopt heterogeneous slag dephosphorization, in dephosphorizing process, it is not necessary to as traditional homogeneous slag system, improve FeO by adding the materials such as substantial amounts of ferrum oxide and active limetWith the activity of CaO, thus the consumption of slag reduces relatively。
2, dephosphorization effect is good。Forming heterogeneous slag system after the Dephosphorising agent that the present invention develops is melted, the phosphorus of the oxidized ferrum oxidation in slag ferrum interface is by liquid phase slag diffusive migration to 2CaO SiO2Xiang Zhong so that liquid phase slag has significantly high phosphorus all the time and holds content, it is possible to continues dephosphorization, adds Na2O、Al2O3And the synergism of other components so that slagging speed accelerates, and slag fluidity is better, accelerates phosphorus diffusion mass transfer in liquid phase slag, and for traditional homogeneous slag system, dephosphorization efficiency is high, and dephosphorization is more thorough。
3, effective enriched phosphorus element。The Dephosphorising agent that the present invention develops utilizes the 2CaO SiO formed after melting2As the enrichment place of phosphorus, according to 2CaO SiO2-3CaO·P2O5Phasor it can be seen that in 1300 DEG C～1400 DEG C temperature ranges, 2CaO SiO2With 3CaO P2O5Stable solid solution, i.e. phosphorus enrichment phase can be formed in very wide scope。This creates condition for isolating phosphorus enrichment phase from dephosphorized slag, is expected to realize the maximization of dephosphorized slag secondary resource comprehensive utilization benefit。
4, the pollution that free-floride is brought。The Dephosphorising agent that the present invention develops does not use fluorite as flux completely, completely eliminate the fluorine-containing impact brought in current molten iron dephosphorization agent, dephosphorizing process will not discharge fluorine-containing harmful gas, infringement site operation personnel's is healthy, and after dephosphorization, the waste residue of discharge will not polluted source and environment。
5, applied widely。The Dephosphorising agent that the present invention develops is suitable in the dephosphorization (molten iron, Si content controls at≤0.10wt%) of the basic, normal, high different phosphate saturated molten iron of content carbon。
Accompanying drawing illustrates:
Accompanying drawing 1 is the XRD diffraction pattern of embodiment 1 gained shrend dephosphorization finishing slag；
Accompanying drawing 2 is the SEM scanning electron microscope (SEM) photograph of embodiment 1 gained shrend dephosphorization finishing slag；
The EDS that accompanying drawing 3 is part A in accompanying drawing 2 can spectrogram；
The EDS that accompanying drawing 4 is part B in accompanying drawing 2 can spectrogram。
This dephosphorization finishing slag as can be seen from Figure 1 exists two kinds of thing phases: a kind of crystal phase being to have obvious diffraction maximum, i.e. 2CaO SiO2-3Ca(Na)O·P2O5Solid solution phase；Another kind is amorphous vitreous body phase, i.e. glassy phase。
As can be seen from Figure 2 this dephosphorization finishing slag is made up of two parts, the black region that a part is is representative with solid solution phase, the white portion that another part is is representative with liquid phase slag。
As can be seen from Figure 3 the essential element in solid solution phase (except oxygen) is phosphorus, calcium, silicon and sodium, and minor element is ferrum and aluminum, and the count number that wherein P elements is per second has reached 3.2, and sodium element and aluminium element have respectively reached 0.4 and 0.21。
As can be seen from Figure 4 the essential element (except oxygen) in liquid phase slag is calcium, silicon, ferrum and aluminum, and minor element is phosphorus and sodium, and the count number that wherein P elements is per second has reached 0.4, and sodium element and aluminium element have respectively reached 0.2 and 0.42。
Detailed description of the invention
Below in conjunction with example, the invention will be further elaborated, and example is merely to illustrate the present invention, rather than limits the present invention in any form。
In the embodiment of the present invention, Dephosphorising agent is prepared by following method:
After becoming distribution to take each raw material by the Dephosphorising agent of design, in mortar, ground and mixed is uniform, is subsequently placed in high temperature resistance furnace and is heated to 1500 DEG C of fritting and is incubated 10min, then is poured into by pre-melted slag on the copper coin with cooling water and carries out chilling, finally grind to form the powder of below 1.5mm, standby。
Embodiment 1
Dephosphorising agent component (percentage ratio is mass percent):
Fe2O3:33、CaO:38、SiO2:20、Na2O:3、Al2O3:6
Carrying out experiments for dephosphorization in high temperature resistance furnace, the saturated molten iron sample weight of carbon is 300g, hot metal composition [P]=0.518%, [Si]≤0.10wt%0.1wt%；Controlling dephosphorization temperature is 1350 DEG C, and at such a temperature, the Dephosphorising agent prepared by 30g adds in molten iron in the way of the input of top, and is stirred with molybdenum bar。During dephosphorization 30min, molten iron [P] drops to 0.076%, and dephosphorization rate is 85.34%。
The dephosphorization finishing slag of embodiment 1 is carried out Water Quenching, after drying and grinding, has carried out XRD powder diffraction analysis, analyzed it is shown that this dephosphorization finishing slag only exists two kinds of thing phases, a kind of 2CaO SiO being to replace part calcium containing sodium2-3Ca(Na)O·P2O5Solid solution thing phase, another kind is the melt cinder phase (referring to Fig. 1) of glassy state。Additionally, this dephosphorized slag to have been entered scanning electron microscope (referring to Fig. 2) and energy spectrum analysis (referring to Fig. 3, Fig. 4), it is further characterized by the existence of both thing phases；The result of energy spectrum analysis is as shown in table 1, as seen from table, with melt cinder mutually in phosphorus content compared with, phosphorus content in solid solution phase is high especially, it is indicated above, this Novel molten iron pretreatment dephosphorizing agent is adopted to carry out dephosphorization, it is possible to phosphorus is effectively enriched with, and this creates advantage for isolating phosphorus enrichment phase from dephosphorized slag。
Table 1: the energy spectrum analysis of shrend dephosphorization finishing slag phase content
| Element (mass percent) | P | Ca | Si | Fe | Na | Al | O |
| Solid solution | 24.76 | 48.49 | 6.22 | 4.88 | 3.23 | 2.51 | 8.92 |
| Liquid phase | 3.54 | 29.45 | 15.65 | 34.54 | 1.69 | 5.77 | 9.37 |
Embodiment 2
Dephosphorising agent component (percentage ratio is mass percent):
Fe2O3:25、CaO:45、SiO2:17、Na2O:10、Al2O3:3
Carrying out experiments for dephosphorization in high temperature resistance furnace, the saturated molten iron sample weight of carbon is 300g, hot metal composition [P]=0.765%, [Si]≤0.10wt%；Controlling dephosphorization temperature is 1350 DEG C, is added in molten iron by the above-mentioned Dephosphorising agent 30g prepared with the method that top puts into, and is stirred with molybdenum bar。During dephosphorization 30min, molten iron [P] drops to 0.113%, and dephosphorization rate is 85.25%。
Embodiment 3
Dephosphorising agent component (percentage ratio is mass percent):
Fe2O3:28、CaO:32、SiO2:30、Na2O:3、Al2O3:7
Carrying out experiments for dephosphorization in high temperature resistance furnace, the saturated molten iron sample weight of carbon is 300g, hot metal composition [P]=0.518%, [Si]≤0.10wt%；Controlling dephosphorization temperature is 1400 DEG C, is added in molten iron by the above-mentioned Dephosphorising agent 30g prepared with the method that top puts into, and is stirred with molybdenum bar。During dephosphorization 30min, molten iron [P] drops to 0.084%, and dephosphorization rate is 83.72%。
Embodiment 4
Dephosphorising agent component (percentage ratio is mass percent):
Fe2O3:32、CaO:41、SiO2:15、Na2O:7、Al2O3:5
Carrying out experiments for dephosphorization in high temperature resistance furnace, the saturated molten iron sample weight of carbon is 300g, hot metal composition [P]=0.342%, [Si]≤0.10wt%；Controlling dephosphorization temperature is 1350 DEG C, is added in molten iron by the above-mentioned Dephosphorising agent 30g prepared with the method that top puts into, and is stirred with molybdenum bar。During dephosphorization 30min, molten iron [P] drops to 0.059%, and dephosphorization rate is 82.64%。
Embodiment 5
Dephosphorising agent component (percentage ratio is mass percent):
Fe2O3:38、CaO:31、SiO2:17、Na2O:2、Al2O3:12
Carrying out experiments for dephosphorization in high temperature resistance furnace, the saturated molten iron sample weight of carbon is 300g, hot metal composition [P]=0.765%, [Si]≤0.10wt%；Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned Dephosphorising agent 30g prepared is added molten iron by the method put into from top, and is stirred with molybdenum bar。During dephosphorization 30min, molten iron [P] drops to 0.133%, and dephosphorization rate is 82.54%。
Embodiment 6
Dephosphorising agent component (percentage ratio is mass percent):
Fe2O3:40、CaO:30、SiO2:20、Na2O:8、Al2O3:2
Carrying out experiments for dephosphorization in high temperature resistance furnace, the saturated molten iron sample weight of carbon is 300g, hot metal composition [P]=0.342%, [Si]≤0.10wt%；Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned Dephosphorising agent 30g prepared is added molten iron by the method put into from top, and is stirred with molybdenum bar。During dephosphorization 30min, molten iron [P] drops to 0.042%, and dephosphorization rate is 87.70%。
Embodiment 7
Dephosphorising agent component (percentage ratio is mass percent):
Fe2O3:50、CaO:27、SiO2:18、Na2O:2、Al2O3:3
Carrying out experiments for dephosphorization in high temperature resistance furnace, the saturated molten iron sample weight of carbon is 300g, hot metal composition [P]=0.518%, [Si]≤0.10wt%；Controlling dephosphorization temperature is 1300 DEG C, and the above-mentioned Dephosphorising agent 30g prepared is added molten iron by the method put into from top, and is stirred with molybdenum bar。During dephosphorization 30min, molten iron [P] drops to 0.091%, and dephosphorization rate is 82.46%。
Embodiment 8
Dephosphorising agent component (percentage ratio is mass percent):
Fe2O3:34、CaO:36、SiO2:20、Na2O:5、Al2O3:5
Carrying out experiments for dephosphorization in high temperature resistance furnace, the saturated molten iron sample weight of carbon is 300g, hot metal composition [P]=0.342%, [Si]≤0.10wt%；Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned Dephosphorising agent 30g prepared is added molten iron by the method put into from top, and is stirred with molybdenum bar。During dephosphorization 30min, molten iron [P] drops to 0.035%, and dephosphorization rate is 89.73%。
Embodiment 9
Dephosphorising agent component (percentage ratio is mass percent):
Fe2O3:34、CaO:35、SiO2:21、Na2O:6、Al2O3:4
Carrying out experiments for dephosphorization in high temperature resistance furnace, the saturated molten iron sample weight of carbon is 300g, hot metal composition [P]=0.765%, [Si]≤0.10wt%；Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned Dephosphorising agent 30g prepared is added molten iron by the method put into from top, and is stirred with molybdenum bar。During dephosphorization 30min, molten iron [P] drops to 0.056%, and dephosphorization rate is 92.64%。
Embodiment 10
Dephosphorising agent component (percentage ratio is mass percent):
Fe2O3:36、CaO:34、SiO2:19、Na2O:4、Al2O3:7
Carrying out experiments for dephosphorization in high temperature resistance furnace, the saturated molten iron sample weight of carbon is 300g, hot metal composition [P]=0.518%, [Si]≤0.10wt%；Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned Dephosphorising agent 30g prepared is added molten iron by the method put into from top, and is stirred with molybdenum bar。During dephosphorization 30min, molten iron [P] drops to 0.042%, and dephosphorization rate is 91.85%。
Comparative example 1
Dephosphorising agent component (percentage ratio is mass percent):
Fe2O3:60、CaO:15、SiO2:10、Na2O:0、Al2O3:15
Carrying out experiments for dephosphorization in high temperature resistance furnace, the saturated molten iron sample weight of carbon is 300g, hot metal composition [P]=0.518%, [Si]≤0.10wt%；Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned Dephosphorising agent 30g prepared is added molten iron by the method put into from top, and is stirred with molybdenum bar。During dephosphorization 30min, molten iron [P] is 0.162%, and dephosphorization rate is 68.72%。
Comparative example 2
Dephosphorising agent component (percentage ratio is mass percent):
Fe2O3:15、CaO:60、SiO2:10、Na2O:2、Al2O3:13
Carrying out experiments for dephosphorization in high temperature resistance furnace, the saturated molten iron sample weight of carbon is 300g, hot metal composition [P]=0.518%, [Si]≤0.10wt%；Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned Dephosphorising agent 30g prepared is added molten iron by the method put into from top, and is stirred with molybdenum bar。During dephosphorization 30min, molten iron [P] is 0.148%, and dephosphorization rate is 71.46%。
Comparative example 3
Dephosphorising agent component (percentage ratio is mass percent):
Fe2O3:15、CaO:60、SiO2:10、Na2O:5、Al2O3:10
Carrying out experiments for dephosphorization in high temperature resistance furnace, the saturated molten iron sample weight of carbon is 300g, hot metal composition [P]=0.518%, [Si]≤0.10wt%；Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned Dephosphorising agent 30g prepared is added molten iron by the method put into from top, and is stirred with molybdenum bar。During dephosphorization 30min, molten iron [P] is 0.137%, and dephosphorization rate is 73.58%。
Claims (8)
1. a Dephosphorising agent；It is characterized in that, be made up of following component by percentage to the quality:
FeOt: 35 ~ 40%；
CaO:30 ~ 40%；
SiO2: 18 ~ 22%；
Na2O:4 ~ 6%；
Al2O3:5~7%。
2. Dephosphorising agent according to claim 1；It is characterized in that: FeOt is selected from FeO, Fe2O3、Fe3O4In at least one。
3. Dephosphorising agent according to claim 2；It is characterized in that: when FeOt is selected from Fe2O3、Fe3O4In at least one time, by Fe2O3And/or Fe3O4After being converted into FeO, add in Dephosphorising agent。
4. Dephosphorising agent according to claim 3；It is characterized in that: FeOt allocates in Dephosphorising agent with the form of iron scale。
5. Dephosphorising agent according to claim 1；It is characterized in that: CaO adds in Dephosphorising agent with the form of Calx；SiO2Add in Dephosphorising agent with the form of Silicon stone；Na2O adds in Dephosphorising agent with the form of the carbonate of the oxide of sodium and/or the hydroxide of sodium and/or sodium and/or the bicarbonate of sodium；Al2O3Add in Dephosphorising agent with the form of bauxite。
6. Dephosphorising agent according to claim 5；It is characterized in that: CaO adds in Dephosphorising agent with the form of active lime；Na2O adds in Dephosphorising agent with the form of the carbonate of sodium and/or the bicarbonate of sodium。
7. Dephosphorising agent according to claim 1；It is characterized in that: 1300oC~1400oWhen C, described Dephosphorising agent is formed with 2CaO SiO2Heterogeneous slag system for solid phase。
8. one kind such as the application of claim 1 Dephosphorising agent；It is characterized in that: its application includes the molten iron of Si content≤0.10wt% is carried out dephosphorizing pretreatment。
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| JP6471640B2 (en) * | 2015-08-03 | 2019-02-20 | 新日鐵住金株式会社 | Phosphate fertilizer raw material and production method thereof |
| CN105400930B (en) * | 2015-12-08 | 2017-12-19 | 东北大学 | A kind of method that high diametan of high phosphorus prepares automatic steel and thomas phosphate |
| CN106319150B (en) * | 2016-09-05 | 2018-06-08 | 中南大学 | A kind of multiphase Dephosphorising agent of modified high phosphorus hot metal and its application |
| CN106636535A (en) * | 2016-12-28 | 2017-05-10 | 河南省西保冶材集团有限公司 | Convertor steelmaking fluorine-free slag former and preparation method thereof |
| CN109423534A (en) * | 2017-08-25 | 2019-03-05 | 鞍钢股份有限公司 | A kind of outer dephosphorization method of molten iron furnace |
| CN107674939A (en) * | 2017-09-29 | 2018-02-09 | 四川德胜集团钒钛有限公司 | A kind of dephosphorization slagging agent and its application |
| CN107723412B (en) * | 2017-09-29 | 2019-09-10 | 唐山钢铁国际工程技术股份有限公司 | A kind of duplex smelting dephosphorization technology of high phosphorus hot metal |
| CN109338027A (en) * | 2018-11-02 | 2019-02-15 | 武汉钢铁有限公司 | A kind of coverter pig pre-melted type compound slagging agent and preparation method thereof |
| CN112961962A (en) * | 2021-02-04 | 2021-06-15 | 东北大学 | Composite dephosphorizing agent for tapping after furnace, preparation method and application |
| CN114606379B (en) * | 2022-03-04 | 2023-07-18 | 中南大学 | Smelting method of high-phosphorus iron ore |
| CN114657326B (en) * | 2022-03-30 | 2024-04-02 | 北京科技大学 | Dephosphorization agent and application thereof |
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| CN103789503A (en) * | 2012-11-03 | 2014-05-14 | 无锡成博科技发展有限公司 | Premelting type dephosphorization agent for converter steelmaking |
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