CN104278124A - Dephosphorizing agent and application thereof - Google Patents
Dephosphorizing agent and application thereof Download PDFInfo
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- CN104278124A CN104278124A CN201410534612.9A CN201410534612A CN104278124A CN 104278124 A CN104278124 A CN 104278124A CN 201410534612 A CN201410534612 A CN 201410534612A CN 104278124 A CN104278124 A CN 104278124A
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Abstract
The invention relates to a dephosphorizing agent and application thereof, belonging to the technical field of ferrous metallurgy. The dephosphorizing agent solves the problems of low dephosphorizing efficiency, high residue consumption, environment pollution and difficulty in resource comprehensive utilization in the existing calcium-oxide-based molten iron pretreatment dephosphorizing agent. The dephosphorizing agent comprises the following components in percentage by mass: 25-50% of FeOt, 20-45% of CaO, 15-30% of SiO2, 2-10% of Na2O and 3-12% of Al2O3. After being molten, the molten iron dephosphorizing can form a solid-phase/liquid-phase coexistent multiphase residue system at 1300-1400 DEG C, wherein the solid phase is a 2CaO.SiO2 phase capable of providing a place for enriching oxidized phosphorus in molten iron, so that the dephosphorizing agent has the characteristics of favorable dephosphorizing effect, low slag consumption, no fluorine and small environmental pollution and is beneficial to comprehensive utilization of dephosphorizing slag.
Description
Technical field
The present invention relates to a kind of dephosphorizing agent and application thereof; Belong to technical field of ferrous metallurgy.
Background technology
Phosphorus is easy to segregation occurs in steel, particularly easily " cold short " phenomenon occurs under cryogenic, affects the anisotropic of steel, thus the mechanical property of reduction steel and welding property etc.Because 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, the application percentage of high-phosphorus iron ore in blast furnace production process improves gradually at a low price, makes the content of phosphorus in molten iron increase undoubtedly.Simultaneously along with the development of society, the quality of user to steel is had higher requirement, the petroleum pipe line 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, force metallargist have to more novel process or technology to reduce the phosphorus content in steel.
At present, in order to smelt low-phosphorous or ultra-low phosphoretic steel kind, pretreatment dephosphorizing is adopted to the molten iron before converter smelting, two classes can be divided into according to the difference of container, one class carries out dephosphorizing pretreatment in the iron ladle containing molten iron or fish torpedo ladle, another kind of is carry out dephosphorizing pretreatment in special converter, and these two class methods industrially all have practical application.The molten iron dephosphorization agent of current application is primarily of compositions such as lime, fluorite and ferric oxide, and because raw material sources are extensive, low price, applies comparatively general.
In order to reduce the cost of dephosphorizing agent, reduce the total amount of steelmaking slag, based on the feature of converter finishing slag high alkalinity high oxidative and converter slag fritting itself, the composition such as lime, ferric oxide that can substitute completely in conventional lime slag system dephosphorizing agent is used as molten iron dephosphorization agent and uses, technology about this respect has been reported: Chinese patent (application number 03115576.6, a kind of take converter slag as the molten iron dephosphorization agent of raw material) discloses the dephosphorizing agent of a kind of converter slag, lime, ferriferous oxide, fluorite, soda, Wingdale preparation; Chinese patent (application number 20091010366.9 take converter slag as compound dephosphorization agent of raw material and preparation method thereof) discloses the dephosphorizing agent of a kind of converter slag, quartz sand, steel rolling iron sheet, bauxitic clay, soda, fluorite preparation; Chinese patent (application number 201210439016.3, a kind of low cost fritting dephosphorizing agent) discloses the fritting dephosphorizing agent of a kind of converter waste residue, dedusting ash, refining slag, quickened lime, fluorite preparation.These dephosphorizing agents all have employed converter slag as raw material, but Shortcomings, because all contain a certain amount of P in converter slag
2o
5, dephosphorizing capacity is limited, during for hot metal pretreatment, need to add quickened lime and ferric oxide, to ensure dephosphorizing agent dephosphorizing capacity thermodynamically, and due to hot metal pretreatment temperature low, converter slag fusing point and lime fusing point high, need with addition of reducing slag melting point, the fusing assistant of promotionization slag, improve the efficiency of dephosphorization, the current overwhelming majority uses fluorite as solubility promoter, discharging fluorine-containing obnoxious flavour with during acidic substance effect in slag, harm site operation personnel's is healthy, and the fluorine after smelting in waste residue can dissolve in water, Oil repellent in water is caused to exceed standard, polluted source and environment.Even is furnished with a small amount of Wingdale in some invention, Wingdale is point heat of desorption at hot metal 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 ratio of dephosphorized slag, and due to dry slag seriously can give operation and subsequent disposal add to the difficulties.
In recent years, in order to build a resource-conserving society, the dephosphorizing agent that to report with other field waste be raw material, Chinese patent (application number 201110117960.2, a kind of liquid iron pretreatment dephosphorizing agent of containing metal magnesium slag) discloses a kind of with magnesium slag, barium carbonate, converter mud, iron scale, fluorite, B
2o
3the dephosphorizing agent of preparation.The weak point of this dephosphorizing agent is containing fluorite, and can bring pollution, environmental problem still exists.In addition, in order to built environment friendly society, a large amount of development cleans metallurgy, consider the disadvantageous effect that fluorite brings environment, Chinese patent (application number 200910263060.1, a kind of liquid iron pretreatment dephosphorizing agent) discloses the floride-free dephosphorizing agent of a kind of converter finishing slag, quickened lime, ferric oxide, boric anhydride preparation.Chinese patent (application number 200910273109.1, fluorine-free molten iron dephosphorization agent) discloses a kind of oxide compound by iron, CaO, B
2o
3, MgO preparation fluorine-free molten iron dephosphorization agent.Although this dephosphorizing agent is not containing fluorine, and B
2o
3to flux successful, not only free from environmental pollution, and phosphorus containing high level in dephosphorized slag after dephosphorization and boron, a desirable boron phosphorus composite chemical fertilizer after treatment, can not contaminated soil and water resources, can realize the comprehensive utilization of high added value, but the use of a large amount of boron can make boron remain in molten iron, the hardening capacity of remarkably influenced 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 dephosphorizing 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 carried out enrichment again, if carry out suitable process to dephosphorization finishing slag, the phosphorus of enrichment is separated from dephosphorization finishing slag, the phosphorus so separated can be used as the surrogate 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
The object of the present invention is to provide one not containing fluorite, environmental friendliness, high financial profit, the dephosphorizing agent be not detrimental to health and application thereof.
A kind of dephosphorizing agent of the present invention; Comprise following component by percentage to the quality:
FeO
t: 25 ~ 50%, be preferably 30 ~ 45%, more preferably 35 ~ 40%;
CaO:20 ~ 45%, is preferably 25 ~ 40%, more preferably 30 ~ 40%;
SiO
2: 15 ~ 30%, be preferably 15 ~ 25%, more preferably 18 ~ 22%;
Na
2o:2 ~ 10%, is preferably 3 ~ 8%, more preferably 4 ~ 6%;
Al
2o
3: 3 ~ 12%, be preferably 4 ~ 10%, more preferably 5 ~ 7%.
A kind of dephosphorizing agent of the present invention; Described FeOt is selected from FeO, Fe
2o
3, Fe
3o
4in at least one.
A kind of dephosphorizing agent of the present invention; When FeOt is selected from Fe
2o
3, Fe
3o
4in at least one time, with Fe
2o
3and/or Fe
3o
4in Fe element be conversion benchmark, by Fe
2o
3and/or Fe
3o
4after being converted into FeO, add in dephosphorizing agent.
A kind of dephosphorizing agent of the present invention; Described FeOt allocates in dephosphorizing agent with the form of iron scale.
A kind of dephosphorizing agent of the present invention; Described CaO adds in dephosphorizing agent with the form of lime; Preferably add in dephosphorizing agent with the form of quickened lime.
A kind of dephosphorizing agent of the present invention; Described SiO
2add in dephosphorizing agent with the form of silica.
A kind of dephosphorizing agent of the present invention; Na
2the O form added in dephosphorizing agent is selected from least one in sodium oxide, sodium hydroxide, sodium carbonate, sodium bicarbonate.Be preferably sodium carbonate and/or sodium bicarbonate.
A kind of dephosphorizing agent of the present invention; Described Al
2o
3add in dephosphorizing agent with the form of the oxide compound of aluminium and/or bauxitic clay, preferably add in dephosphorizing agent with the form of bauxitic clay.
A kind of dephosphorizing agent of the present invention; Formed with 2CaOSiO under 1300 DEG C ~ 1400 DEG C conditions
2for the heterogeneous slag system of solid phase.
A kind of dephosphorizing agent of the present invention; Its preparation method is:
Mix after becoming distribution to get each raw material by the dephosphorizing agent of design, then being placed in resistance furnace 1500 DEG C of fritting is incubated 10min, again pre-melted slag is poured on the copper coin with water coolant and carries out chilling, finally being broken into granularity is that the powder of below 1.5mm (be preferably 0.6mm ~ 1.2mm, more preferably 0.8mm ~ 1.0mm) is for subsequent use.
The application of a kind of dephosphorizing agent of the present invention; Its application comprises carries out dephosphorizing pretreatment to the molten iron of Si content≤0.10wt%.
When dephosphorizing agent of the present invention is applied to the molten iron for the treatment of S i content≤0.10wt%, control temperature >=1300 DEG C, are preferably 1300-1400 DEG C.
When dephosphorizing agent of the present invention is applied to the molten iron for the treatment of S i content≤0.10wt%, add the dephosphorizing agent of 100kg ~ 150kg by molten iron per ton.Its dephosphorization efficiency >=82%.
A kind of molten iron dephosphorization agent of the present invention; Its application can also comprise the Metal smelting for the treatment of Si content≤0.10wt%.
Principle and advantage
The dephosphorizing agent that the present invention develops, completely not containing fluorite, environmental friendliness, be not detrimental to health, when adopting this dephosphorizing agent dephosphorization, the consumption of slag reduces, dephosphorization effect is good, the phosphoric removed can be carried out effective enrichment simultaneously, be conducive to the high value added utilization realizing dephosphorized slag, there is good social benefit, economic benefit and use value.
FeO in dephosphorizing agent of the present invention
teffect have two aspects, being on the one hand oxygen supply and transmit oxygen in molten iron, is P by the phosphorus oxidation in molten iron
2o
5; Promote that namely the melting of lime changes slag effect on the other hand.FeO
tconsumption is unfavorable for oxidation and the slag making of phosphorus in molten iron very little, on the contrary, and FeO
tthe badly damaged furnace lining of the too high meeting of consumption.CaO and SiO in dephosphorizing agent of the present invention
2effect be except liquid making phase slag, mainly by the two interaction formed 2CaOSiO
2solids phase, for the enrichment of phosphorus provides place, phosphorus enters liquid phase slag and is diffused into 2CaOSiO after the oxidation of slag iron interface
2thing phase surface reacts with it the enrichment phase forming phosphorus, i.e. 2CaOSiO
2-3CaOP
2o
5sosoloid.The present invention adds CaO with quickened lime, can dephosphorization slagging fast under the synergy of other components.
In dephosphorizing agent of the present invention, Na
2o not only has the ability of phosphorus in oxidation molten iron, and can promote the melting of lime, accelerates slagging, effectively can also reduce the viscosity of dephosphorization slag simultaneously, and promote the mass transfer of phosphorus in slag, favourable phosphorus is to solid 2CaOSiO
2middle enrichment.The present invention strictly controls Na in dephosphorizing agent
2the content of O, its reason is: Na
2the too high levels of O, not only causes Na
2a large amount of wastes of O, but also the dephosphorization efficiency that can affect dephosphorizing agent; Na
2the content of O is too low, be then unfavorable for slag making, affects the mass transfer of phosphorus in liquid phase slag simultaneously.
In dephosphorizing agent of the present invention, Al
2o
3under the synergy of other components, especially at Na
2the melting of lime can not only be facilitated under the synergy of O, accelerate slagging, and improve the mobility of slag simultaneously, be conducive to realizing quick dephosphorization.
The present invention, by the strict composition and the consumption that control each component, under the synergy of each component, achieves the efficient removal to phosphoric in molten iron, and achieves effective enrichment of phosphoric simultaneously.
Dephosphorizing agent of the present invention is applicable to the dephosphorization of basic, normal, high various phosphorus content ([P] <0.8%) carbon saturated iron water.Before dephosphorization, molten iron should first pre-desiliconizing, is controlled by Si content in molten iron at≤0.10wt%, and to control dephosphorization temperature be 1300 DEG C ~ 1400 DEG C simultaneously, is conducive to the dephosphorization realizing high-level efficiency, high depth like this.
Advantage
1, the consumption of slag is few.Heterogeneous slag system in solid-liquid two-phase coexistent in 1300 DEG C ~ 1400 DEG C temperature ranges after the phosphorus agent melting that the present invention develops, wherein solid phase is 2CaOSiO
2phase.According to cohesion phase rule, temperature is certain, and the degree of freedom of system is 1, shows FeO
tconstant with the activity of CaO.When meaning the heterogeneous slag dephosphorization of employing, in dephosphorizing process, do not need, as traditional homogeneous phase slag system, to improve FeO by adding the materials such as a large amount of ferric oxide and quickened lime
twith the activity of CaO, thus the consumption of slag reduces relatively.
2, dephosphorization effect is good.Form heterogeneous slag system after the dephosphorizing agent melting that the present invention develops, the phosphorus of the oxidized Fe forms in slag iron interface passes through liquid phase slag diffusive migration to 2CaOSiO
2xiang Zhong, makes liquid phase slag have very high phosphorus all the time and holds content, can continue dephosphorization, add Na
2o, Al
2o
3and the synergy of other components, slagging speed is accelerated, and slag fluidity is better, and accelerate the diffusion mass transfer of phosphorus in liquid phase slag, for traditional homogeneous phase slag system, dephosphorization efficiency is high, and dephosphorization is more thorough.
3, effective enriched phosphorus element.The 2CaOSiO that the dephosphorizing agent that the present invention develops is formed after utilizing melting
2as the enrichment place of phosphorus, according to 2CaOSiO
2-3CaOP
2o
5phasor is known, in 1300 DEG C ~ 1400 DEG C temperature ranges, and 2CaOSiO
2and 3CaOP
2o
5stable sosoloid can be formed, i.e. phosphorus enrichment phase in very wide scope.This creates condition for isolating phosphorus enrichment phase from dephosphorized slag, is expected to the maximization realizing dephosphorized slag secondary resource comprehensive utilization benefit.
4, the pollution that brings of free-floride.The dephosphorizing agent that the present invention develops does not use fluorite as fusing assistant completely, completely eliminate the fluorine-containing impact brought in current molten iron dephosphorization agent, fluorine-containing obnoxious flavour can not be discharged in dephosphorizing process, infringement site operation personnel's is healthy, and the waste residue discharged after dephosphorization can not polluted source and environment.
5, applied widely.The dephosphorizing agent that the present invention develops is applicable to the dephosphorization (in molten iron, Si content controls at≤0.10wt%) of basic, normal, high different phosphate content carbon saturated iron water.
Accompanying drawing illustrates:
Accompanying drawing 1 is the XRD diffractogram 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;
Accompanying drawing 3 is the EDS energy spectrogram of part A in accompanying drawing 2;
Accompanying drawing 4 is that the EDS of part B in accompanying drawing 2 can spectrogram.
As can be seen from Figure 1 there are two kinds of thing phases in this dephosphorization finishing slag: a kind of is the crystal phase with obvious diffraction peak, i.e. 2CaOSiO
2-3Ca (Na) OP
2o
5solid solution phase; Another kind is amorphous vitreum phase, i.e. glassy phase.
As can be seen from Figure 2 this dephosphorization finishing slag is made up of two portions, and a part take solid solution phase as the black region of representative, the white portion that another part is is representative with liquid phase slag.
As can be seen from Figure 3 the principal element (except oxygen) in solid solution phase is phosphorus, calcium, silicon and sodium, and minor element is iron and aluminium, and the count number that wherein phosphoric is per second reaches 3.2, and sodium element and aluminium element reach 0.4 and 0.21 respectively.
As can be seen from Figure 4 the principal element (except oxygen) in liquid phase slag is calcium, silicon, iron and aluminium, and minor element is phosphorus and sodium, and the count number that wherein phosphoric is per second reaches 0.4, and sodium element and aluminium element reach 0.2 and 0.42 respectively.
Embodiment
Below in conjunction with example, the invention will be further elaborated, and example only for illustration of the present invention, instead of limits the present invention in any form.
In the embodiment of the present invention, dephosphorizing agent is obtained by following method:
After becoming distribution to get each raw material by the dephosphorizing agent of design, in mortar, ground and mixed is even, is then 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 water coolant and carries out chilling, finally grind to form the powder of below 1.5mm, for subsequent use.
Embodiment 1
Dephosphorizing agent component (per-cent is mass percent):
Fe
2O
3:33、CaO:38、SiO
2:20、Na
2O:3、Al
2O
3:6
In high temperature resistance furnace, carry out experiments for dephosphorization, carbon saturated iron water sample weight 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 mode that the dephosphorizing agent prepared by 30g drops into top adds in molten iron, and stirs with molybdenum bar.During dephosphorization 30min, molten iron [P] drops to 0.076%, and dephosphorization rate is 85.34%.
Carry out Water Quenching to the dephosphorization finishing slag of embodiment 1, after drying and grinding, carried out XRD powder diffraction analysis, analytical results shows, only there are two kinds of thing phases in this dephosphorization finishing slag, a kind of 2CaOSiO for replacing part calcium containing sodium
2-3Ca (Na) OP
2o
5sosoloid thing phase, another kind is the melt cinder phase (see Fig. 1) of vitreous state.In addition, scanning electronic microscope (see Fig. 2) and energy spectrum analysis (see Fig. 3, Fig. 4) have been entered to this dephosphorized slag, confirmed the existence of these two kinds of thing phases further; 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, show thus, adopt this Novel molten iron pretreatment dephosphorizing agent to carry out dephosphorization, can carry out effective enrichment to phosphorus, this creates favourable condition 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 |
| Sosoloid | 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
Dephosphorizing agent component (per-cent is mass percent):
Fe
2O
3:25、CaO:45、SiO
2:17、Na
2O:10、Al
2O
3:3
In high temperature resistance furnace, carry out experiments for dephosphorization, carbon saturated iron water sample weight 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 dephosphorizing agent 30g prepared, and stir with molybdenum bar with the method that top is dropped into.During dephosphorization 30min, molten iron [P] drops to 0.113%, and dephosphorization rate is 85.25%.
Embodiment 3
Dephosphorizing agent component (per-cent is mass percent):
Fe
2O
3:28、CaO:32、SiO
2:30、Na
2O:3、Al
2O
3:7
In high temperature resistance furnace, carry out experiments for dephosphorization, carbon saturated iron water sample weight 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 dephosphorizing agent 30g prepared, and stir with molybdenum bar with the method that top is dropped into.During dephosphorization 30min, molten iron [P] drops to 0.084%, and dephosphorization rate is 83.72%.
Embodiment 4
Dephosphorizing agent component (per-cent is mass percent):
Fe
2O
3:32、CaO:41、SiO
2:15、Na
2O:7、Al
2O
3:5
In high temperature resistance furnace, carry out experiments for dephosphorization, carbon saturated iron water sample weight 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 dephosphorizing agent 30g prepared, and stir with molybdenum bar with the method that top is dropped into.During dephosphorization 30min, molten iron [P] drops to 0.059%, and dephosphorization rate is 82.64%.
Embodiment 5
Dephosphorizing agent component (per-cent is mass percent):
Fe
2O
3:38、CaO:31、SiO
2:17、Na
2O:2、Al
2O
3:12
In high temperature resistance furnace, carry out experiments for dephosphorization, carbon saturated iron water sample weight is 300g, hot metal composition [P]=0.765%, [Si]≤0.10wt%; Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned dephosphorizing agent 30g prepared adds molten iron by the method dropped into from top, and stirs with molybdenum bar.During dephosphorization 30min, molten iron [P] drops to 0.133%, and dephosphorization rate is 82.54%.
Embodiment 6
Dephosphorizing agent component (per-cent is mass percent):
Fe
2O
3:40、CaO:30、SiO
2:20、Na
2O:8、Al
2O
3:2
In high temperature resistance furnace, carry out experiments for dephosphorization, carbon saturated iron water sample weight is 300g, hot metal composition [P]=0.342%, [Si]≤0.10wt%; Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned dephosphorizing agent 30g prepared adds molten iron by the method dropped into from top, and stirs with molybdenum bar.During dephosphorization 30min, molten iron [P] drops to 0.042%, and dephosphorization rate is 87.70%.
Embodiment 7
Dephosphorizing agent component (per-cent is mass percent):
Fe
2O
3:50、CaO:27、SiO
2:18、Na
2O:2、Al
2O
3:3
In high temperature resistance furnace, carry out experiments for dephosphorization, carbon saturated iron water sample weight is 300g, hot metal composition [P]=0.518%, [Si]≤0.10wt%; Controlling dephosphorization temperature is 1300 DEG C, and the above-mentioned dephosphorizing agent 30g prepared adds molten iron by the method dropped into from top, and stirs with molybdenum bar.During dephosphorization 30min, molten iron [P] drops to 0.091%, and dephosphorization rate is 82.46%.
Embodiment 8
Dephosphorizing agent component (per-cent is mass percent):
Fe
2O
3:34、CaO:36、SiO
2:20、Na
2O:5、Al
2O
3:5
In high temperature resistance furnace, carry out experiments for dephosphorization, carbon saturated iron water sample weight is 300g, hot metal composition [P]=0.342%, [Si]≤0.10wt%; Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned dephosphorizing agent 30g prepared adds molten iron by the method dropped into from top, and stirs with molybdenum bar.During dephosphorization 30min, molten iron [P] drops to 0.035%, and dephosphorization rate is 89.73%.
Embodiment 9
Dephosphorizing agent component (per-cent is mass percent):
Fe
2O
3:34、CaO:35、SiO
2:21、Na
2O:6、Al
2O
3:4
In high temperature resistance furnace, carry out experiments for dephosphorization, carbon saturated iron water sample weight is 300g, hot metal composition [P]=0.765%, [Si]≤0.10wt%; Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned dephosphorizing agent 30g prepared adds molten iron by the method dropped into from top, and stirs with molybdenum bar.During dephosphorization 30min, molten iron [P] drops to 0.056%, and dephosphorization rate is 92.64%.
Embodiment 10
Dephosphorizing agent component (per-cent is mass percent):
Fe
2O
3:36、CaO:34、SiO
2:19、Na
2O:4、Al
2O
3:7
In high temperature resistance furnace, carry out experiments for dephosphorization, carbon saturated iron water sample weight is 300g, hot metal composition [P]=0.518%, [Si]≤0.10wt%; Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned dephosphorizing agent 30g prepared adds molten iron by the method dropped into from top, and stirs with molybdenum bar.During dephosphorization 30min, molten iron [P] drops to 0.042%, and dephosphorization rate is 91.85%.
Comparative example 1
Dephosphorizing agent component (per-cent is mass percent):
Fe
2O
3:60、CaO:15、SiO
2:10、Na
2O:0、Al
2O
3:15
In high temperature resistance furnace, carry out experiments for dephosphorization, carbon saturated iron water sample weight is 300g, hot metal composition [P]=0.518%, [Si]≤0.10wt%; Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned dephosphorizing agent 30g prepared adds molten iron by the method dropped into from top, and stirs with molybdenum bar.During dephosphorization 30min, molten iron [P] is 0.162%, and dephosphorization rate is 68.72%.
Comparative example 2
Dephosphorizing agent component (per-cent is mass percent):
Fe
2O
3:15、CaO:60、SiO
2:10、Na
2O:2、Al
2O
3:13
In high temperature resistance furnace, carry out experiments for dephosphorization, carbon saturated iron water sample weight is 300g, hot metal composition [P]=0.518%, [Si]≤0.10wt%; Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned dephosphorizing agent 30g prepared adds molten iron by the method dropped into from top, and stirs with molybdenum bar.During dephosphorization 30min, molten iron [P] is 0.148%, and dephosphorization rate is 71.46%.
Comparative example 3
Dephosphorizing agent component (per-cent is mass percent):
Fe
2O
3:15、CaO:60、SiO
2:10、Na
2O:5、Al
2O
3:10
In high temperature resistance furnace, carry out experiments for dephosphorization, carbon saturated iron water sample weight is 300g, hot metal composition [P]=0.518%, [Si]≤0.10wt%; Controlling dephosphorization temperature is 1350 DEG C, and the above-mentioned dephosphorizing agent 30g prepared adds molten iron by the method dropped into from top, and stirs with molybdenum bar.During dephosphorization 30min, molten iron [P] is 0.137%, and dephosphorization rate is 73.58%.
Claims (10)
1. a dephosphorizing agent; It is characterized in that, comprise following component by percentage to the quality:
FeO
t:25～50％；
CaO:20～45％；
SiO
2:15～30％；
Na
2O:2～10％；
Al
2O
3:3～12％。
2. dephosphorizing agent according to claim 1; It is characterized in that, comprise following component by percentage to the quality:
FeO
t:30～45％；
CaO:25～40％；
SiO
2:15～25％；
Na
2O:3～8％；
Al
2O
3:4～10％。
3. dephosphorizing agent according to claim 2; It is characterized in that, comprise following component by percentage to the quality:
FeO
t:35～40％；
CaO:30～40％；
SiO
2:18～22％；
Na
2O:4～6％；
Al
2O
3:5～7％。
4. the dephosphorizing agent according to claim 1-3 any one; It is characterized in that: FeOt is selected from FeO, Fe
2o
3, Fe
3o
4in at least one.
5. the dephosphorizing agent according to claim 4 any one; It is characterized in that: when FeOt is selected from Fe
2o
3, Fe
3o
4in at least one time, by Fe
2o
3and/or Fe
3o
4after being converted into FeO, add in dephosphorizing agent.
6. the dephosphorizing agent according to claim 4 any one; It is characterized in that: FeOt allocates in dephosphorizing agent with the form of iron scale.
7. the dephosphorizing agent according to claim 1-3 any one; It is characterized in that:
CaO adds in dephosphorizing agent with the form of lime;
SiO
2add in dephosphorizing agent with the form of silica;
Na
2the O form added in dephosphorizing agent is selected from least one in sodium oxide, sodium hydroxide, sodium carbonate, sodium bicarbonate;
Al
2o
3add in dephosphorizing agent with the form of bauxitic clay.
8. dephosphorizing agent according to claim 7; It is characterized in that:
CaO adds in dephosphorizing agent with the form of quickened lime;
Na
2the O form added in dephosphorizing agent is sodium carbonate and/or sodium bicarbonate.
9. the dephosphorizing agent according to claim 1-3 any one; It is characterized in that: under 1300 DEG C ~ 1400 DEG C conditions, described dephosphorizing agent is formed with 2CaOSiO
2for the heterogeneous slag system of solid phase.
10. the application of a dephosphorizing agent as described in claim 1-3 any one; It is characterized in that: its application comprises carries out dephosphorizing pretreatment to the molten iron of Si content≤0.10wt%.
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