CN114657326A - Dephosphorization agent and application thereof - Google Patents
Dephosphorization agent and application thereof Download PDFInfo
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- CN114657326A CN114657326A CN202210326699.5A CN202210326699A CN114657326A CN 114657326 A CN114657326 A CN 114657326A CN 202210326699 A CN202210326699 A CN 202210326699A CN 114657326 A CN114657326 A CN 114657326A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 98
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 52
- 229910052742 iron Inorganic materials 0.000 claims abstract description 42
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 13
- 239000011574 phosphorus Substances 0.000 claims abstract description 12
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000009628 steelmaking Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 66
- 239000000292 calcium oxide Substances 0.000 claims description 42
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 21
- 229910052593 corundum Inorganic materials 0.000 claims description 21
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 21
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 17
- 229910001691 hercynite Inorganic materials 0.000 claims description 15
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 12
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 7
- 229910015372 FeAl Inorganic materials 0.000 claims description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 229910044991 metal oxide Inorganic materials 0.000 claims description 5
- 150000004706 metal oxides Chemical class 0.000 claims description 5
- 229910020489 SiO3 Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 1
- 239000002893 slag Substances 0.000 abstract description 13
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 5
- 238000002844 melting Methods 0.000 abstract description 4
- 230000008018 melting Effects 0.000 abstract description 4
- 238000003723 Smelting Methods 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 70
- 235000012255 calcium oxide Nutrition 0.000 description 35
- 239000011734 sodium Substances 0.000 description 18
- 239000002994 raw material Substances 0.000 description 9
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 8
- 238000007664 blowing Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 229910000805 Pig iron Inorganic materials 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000004115 Sodium Silicate Substances 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 229910001570 bauxite Inorganic materials 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 4
- 235000017557 sodium bicarbonate Nutrition 0.000 description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- -1 MgO Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
Images
Classifications
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention provides a dephosphorizing agent for pre-dephosphorizing medium and high phosphorus molten iron and a preparation method and application thereof, belonging to the technical field of metallurgy. The dephosphorization agent of the invention has low melting point of slag system, extremely fast slag formation, good fluidity, high phosphorus capacity and high dephosphorization efficiency. The dephosphorizing agent can realize the dephosphorization rate of more than 70 percent in a short time of storing and transporting molten iron to a converter process. After the dephosphorization of the molten iron is carried out by adopting the dephosphorizing agent disclosed by the invention, more than 70% of dephosphorization is completed before the molten iron enters the converter, so that the dephosphorizing agent can be suitable for the molten iron with the initial [ P ] content of about 0.25%, the application proportion of poor-quality iron ore resources with higher phosphorus content in the blast furnace is obviously improved compared with the existing blast furnace burden structure, the smelting efficiency in the converter steelmaking process is effectively improved, the emission of slag quantity and the like is obviously reduced, and the economic benefit and the environmental benefit are huge.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a dephosphorizing agent and application thereof.
Background
Phosphorus is a typical impurity element in molten steel, and dephosphorization is one of the basic operations of a steelmaking process. In the converter steelmaking process, the phosphorus load is too high, so that on one hand, a series of problems of long smelting period, large slag quantity, high discharge, high energy consumption, large iron loss and the like are caused; on the other hand, since no external heat source is used in converter steelmaking, the molten iron [ P ] entering the converter is not allowed to be too high from the heat perspective, and the molten iron [ P ] is usually required to be less than 0.15%, which greatly limits the use range of iron ore resources with higher phosphorus content (such as high-phosphorus iron ore which is a characteristic in China).
Most of the traditional molten iron pre-dephosphorization methods only use lime and iron scale (or oxygen as a gas oxygen source) as dephosphorization agents, under the condition, the lime dissolution efficiency is low, the slag fluidity is poor, and the dephosphorization dynamic condition is severe, so the pre-dephosphorization efficiency is very low.
Disclosure of Invention
The invention aims to provide a dephosphorizing agent and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a dephosphorizing agent, which comprises CaO and Fe in terms of metal oxide2O3、Al2O3And Na2O; said Fe2O3And CaO in a mass ratio of (1-8): 1; the CaO and Al2O3The mass ratio of (4-13): 1; the Al is2O3And Na2The mass ratio of O is (2-8): 1.
preferably, the CaO is made of a material containing CaO or CaCO3The material of (1).
Preferably, the mass content of CaO in the CaO-containing material is 65% or more; said CaCO-containing3Of the material CaCO3The mass content of (A) is more than 65%.
Preferably, said Fe2O3From Fe2O3Of a material containing FeAl2O4The material of (1).
Preferably, said Fe is contained2O3Of the material (1) Fe2O3The mass content of (A) is more than 70%; the FeAl-containing component2O4In the material of (1) FeAl2O4The mass content of (A) is more than 40%.
Preference is given toOf the Al2O3From Al-containing2O3Of a material containing FeAl2O4The material of (1).
Preferably, the Al-containing2O3Of Al2O3The mass content of (A) is more than 65%.
Preferably, the Na is2O is formed by containing Na2O-containing material, Na-containing material2CO3Or containing Na2SiO3The material of (1).
Preferably, the Na-containing compound2Na in O material2The mass content of O is more than 80 percent; the component containing Na2CO3Na in the material of (1)2CO3The mass content of (A) is more than 80%; the component containing Na2SiO3Na in the material of (1)2SiO3The mass content of (A) is more than 80%.
The invention provides the application of the dephosphorizing agent in the scheme to dephosphorization of iron-containing materials in a steelmaking process, wherein the phosphorus content of the iron-containing materials is less than or equal to 0.25 wt%.
The invention provides a dephosphorizing agent, which comprises CaO and Fe in terms of metal oxide2O3、Al2O3And Na2O; said Fe2O3And CaO in a mass ratio of (1-8): 1; the CaO and Al2O3The mass ratio of (4-13): 1; the Al is2O3And Na2The mass ratio of O is (2-8): 1.
the dephosphorizing agent of the invention contains a proper amount of Al2O3、Na2O, reduces the traditional CaO and Fe2O3The melting point of the slag system improves the fluidity of the slag. Meanwhile, the solubility of lime is improved, so that the content of slag system calcium phosphate solid solution is increased, and the phosphorus capacity is improved. Therefore, the dephosphorizing agent disclosed by the invention has the advantages of lower melting point of slag system, extremely fast slag formation, better fluidity, high phosphorus capacity and high dephosphorization efficiency, and has great market prospect and application value.
The dephosphorizing agent can realize the dephosphorization rate of more than 70 percent in a short time when the molten iron is stored and transported to a converter process. After the dephosphorizing agent is adopted to carry out molten iron pre-dephosphorization, more than 70 percent of dephosphorization is completed before the molten iron enters the converter, so that the available range of iron ore resources can be effectively expanded, the application proportion of inferior iron ore resources with higher phosphorus content in the blast furnace is obviously improved, the smelting efficiency in the converter steelmaking process is effectively improved, the emission of slag quantity and the like is obviously reduced, and the economic benefit and the environmental benefit are huge.
Drawings
FIG. 1 is a flow chart of a preparation method of the high-efficiency dephosphorizing agent provided by the invention.
Detailed Description
The invention provides a dephosphorizing agent, which comprises CaO and Fe in terms of metal oxide2O3、Al2O3And Na2O; said Fe2O3And CaO in a mass ratio of (1-8): 1; the CaO and Al2O3The mass ratio of (4-13): 1; the Al is2O3And Na2The mass ratio of O is (2-8): 1.
in the present invention, the Fe2O3And CaO preferably (2-7): 1, more preferably (3-6): 1; the CaO and Al2O3The mass ratio of (2) to (11): 1, more preferably (8-10): 1; the Al is2O3And Na2The mass ratio of O is preferably (3-7): 1, more preferably (4-6): 1.
in the present invention, the CaO is preferably composed of a CaO-containing material or CaCO-containing material3The CaO-containing material is provided, wherein the mass content of CaO in the CaO-containing material is preferably more than 65%; said CaCO-containing3Of the material CaCO3The mass content of (b) is preferably 65% or more. For the invention containing CaO or CaCO3The material (A) has no special requirements, and the CaO or CaCO content meeting the content requirement is well known in the art3The material of (1) may be, specifically, quicklime or limestone.
In the present invention, the Fe2O3Preferably from Fe2O3Of a material containing FeAl2O4Providing the material of (1); said Fe-containing2O3Of (2) aMiddle Fe2O3The mass content of (b) is preferably 70% or more; the FeAl-containing component2O4In the material of (1) FeAl2O4The mass content of (b) is preferably 40% or more. The invention is to contain Fe2O3Or FeAl2O4The material (b) has no particular requirement, and Fe-containing materials satisfying the above content requirement are well known in the art2O3Or FeAl2O4The material can be any material, such as one or more of rolled iron sheet, iron ore powder and tailings.
In the present invention, the Al2O3Preferably from Al-containing2O3Or containing FeAl2O4The Al-containing material2O3Of Al2O3The mass content of (b) is preferably 65% or more; the FeAl-containing component2O4In the material of (1) FeAl2O4The mass content of (b) is preferably 40% or more. The invention is directed to the Al-containing2O3Of a material containing FeAl2O4The material (D) is not particularly limited, and Al-containing materials satisfying the above-mentioned content requirement are well known in the art2O3Or FeAl2O4The material can be selected from bauxite and high-aluminum tailings.
In the present invention, the Na is2O is preferably selected from Na2Material of O, containing Na2CO3Or containing Na2SiO3The material of (1) contains Na2Na in O material2The mass content of O is more than 80 percent; the component containing Na2CO3Na in the material of (1)2CO3The mass content of (A) is more than 80%; said component containing Na2SiO3Na in the material of (1)2SiO3The mass content of (A) is more than 80%. The invention contains Na2O、Na2CO3Or Na2SiO3The material (b) has no particular requirement, and Na-containing materials satisfying the above content requirement are well known in the art2O、Na2CO3Or Na2SiO3The material (b) may be, specifically, one or more of baking soda, soda and sodium silicate. In the present invention, in the case of the present invention,the sodium silicate is liquid sodium silicate or solid sodium silicate.
In the invention, the mass content of P in the dephosphorizing agent is preferably less than 0.1%, the mass content of S is preferably less than 0.05%, and the existence of impurities of P and S in the raw materials is not beneficial to dephosphorization.
In the present invention, the dephosphorizing agent further inevitably contains other metal oxides such as MgO, TiO2The content of the other metal oxide is preferably not more than 2%.
In addition, the dephosphorizing agent of the invention also contains silicon dioxide which can adjust the alkalinity and reduce the melting point in the slag component, and the invention does not specially limit the content of the silicon dioxide.
CaO and Fe in the dephosphorizing agent2O3、Al2O3And Na2The total O content is preferably 92% or more.
The preparation method of the dephosphorizing agent has no special requirements, the corresponding raw materials are directly mixed according to the mass ratio of each metal oxide in the dephosphorizing agent, and then the mixture is crushed and uniformly mixed to prepare the blowing powder, pellets or briquettes, and the specific preparation flow chart is shown in figure 1.
When the dephosphorizing agent is blowing powder, the particle size of the blowing powder is preferably 0.5 mm-2 mm; when the dephosphorizing agent is pellets or briquettes, the particle size of the pellets or briquettes is preferably 10 mm-20 mm.
In the present invention, if a material can provide Fe at the same time2O3And Al2O3E.g. containing FeAl2O4The material (2) is FeAl in terms of raw material2O4Conversion to Fe at the same time2O3And Al2O3。
The invention provides application of the dephosphorizing agent in the scheme in pre-dephosphorization of molten iron.
In the invention, the content of [ P ] in the molten iron before pre-dephosphorization is less than or equal to 0.25 wt%, preferably 0.15-0.25%, and more preferably 0.2-0.25%. The present invention has no special requirement for the content of [ C ] in the molten iron, and the molten iron can be any blast furnace molten iron well known in the art.
In the present invention, the pre-dephosphorization is preferably performed before the molten iron enters the converter, and more preferably, during the process of storing or transporting the molten iron to the converter, such as: adding the dephosphorizing agent into a hot metal ladle or a torpedo tank car for pre-dephosphorization. In the invention, when the molten iron pre-dephosphorization operation is carried out, the top of the molten iron tank or the torpedo tank car can be selectively provided with a dust removal or oxygen blowing device, the oxygen blowing device can play a role of stirring to promote dephosphorization, dust escapes in the oxygen blowing process, and the dust removal device can be arranged to reduce dust. In the invention, the usage amount of the dephosphorizing agent is preferably 2-10 wt% of the molten iron; the temperature of the pre-dephosphorization is preferably 1350-1480 ℃, and more preferably 1380-1450 ℃; the time for pre-dephosphorization is preferably 6-12 min, and more preferably 8-10 min. In the present invention, the mass of the dephosphorizing agent is calculated by the mass of the metal oxide after conversion.
The dephosphorizing agent and its application provided by the present invention will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Example 1
The raw materials of quicklime, bauxite, baking soda and steel rolling sheet iron are fully mixed and ground to prepare a pressing block with the grain size of 15 mm. Wherein the dephosphorizing agent contains Fe according to the mass ratio2O3: CaO is 4.1: 1. the mass ratio of CaO: al (Al)2O38.5:1, mass ratio Al2O3：Na2O is 5.1: 1.
Table 1 example 1 each raw material main component (wt%)
Taking 2.20Kg of pig iron block with the initial [ C ] content of 4.3 wt% and the [ P ] content of 0.23 wt% to carry out dephosphorization test, controlling the temperature to 1410 ℃, respectively adding 150g of dephosphorization agent into the furnace, and carrying out dephosphorization for 10min to obtain molten iron with the [ P ] content of 0.060 wt% and the [ C ] content of 3.2 wt%. The dephosphorization rate is 73.9 percent.
Example 2
The raw materials of limestone, bauxite, baking soda and iron-containing tailings are fully mixed and ground to prepare powder with the particle size of 1 mm. Wherein the dephosphorizing agent contains Fe according to the mass ratio2O3: CaO is 2.3:1, and the mass ratio of CaO: al (Al)2O38.4:1, mass ratio Al2O3：Na2O is 4.3: 1.
Table 2 example 2 main components (wt%) of each raw material
2.15Kg of pig iron blocks with the initial [ C ] content of 4.5 wt% and the [ P ] content of 0.24 wt% are taken to carry out pre-dephosphorization test, the temperature is controlled to 1410 ℃, 148g of dephosphorization agent is respectively added into the furnace to carry out dephosphorization for 10min, and molten iron with the [ P ] content of 0.064 wt% and the [ C ] content of 4.0 wt% is obtained. The dephosphorization rate is 73.3 percent.
Example 3
The raw materials of quicklime, bauxite, baking soda and iron-containing tailings are taken, the components are shown in the table 1 and the table 2, and after the raw materials are fully mixed and ground, the mixture is prepared into briquettes with the particle size of 20 mm. Wherein the dephosphorizing agent contains Fe according to the mass ratio2O3: CaO is 4.2:1, and the mass ratio of CaO: al (Al)2O39.8:1, mass ratio Al2O3：Na2O is 4.8: 1.
2.3Kg of pig iron blocks with the initial [ C ] content of 4.5 wt% and the [ P ] content of 0.24 wt% are taken to carry out a pre-dephosphorization test, the temperature is controlled to 1410 ℃, 159g of dephosphorization agent is respectively added into the furnace to carry out dephosphorization for 10min, and molten iron with the [ P ] content of 0.066 wt% and the [ C ] content of 3.6 wt% is obtained. The dephosphorization rate is 72.5 percent.
Comparative example 1
The conditions of the molten iron were substantially the same as those of example 1, initial [ C ]]The content is 4.4 wt%, [ P ]]2.10Kg of pig iron blocks with a content of 0.23 wt% was subjected to preliminary dephosphorization, the temperature was controlled to 1410 deg.C, 150g of dephosphorization agent was added to the furnace, respectively, and dephosphorization was conducted for 10min, except that the dephosphorization agent was addedOnly lime and steel sheet, i.e. CaO: Fe2O35.6. The dephosphorizing slag comprises the following components in percentage by mass: (FeO%) -29.8, binary basicity (CaO/SiO)2) R ═ 3.93. The dephosphorized molten iron comprises the following components: [ P ]]0.123wt％、[C]2.6 wt%. The dephosphorization rate is 46.5%.
As can be seen from the above examples and comparative examples, the dephosphorizing agent provided by the invention has higher dephosphorizing rate than the conventional dephosphorizing agent.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The dephosphorizing agent is characterized in that the chemical composition of the dephosphorizing agent is calculated by metal oxides and comprises CaO and Fe2O3、Al2O3And Na2O; said Fe2O3And CaO in a mass ratio of (1-8): 1; the CaO and Al2O3The mass ratio of (4-13): 1; the Al is2O3And Na2The mass ratio of O is (2-8): 1.
2. dephosphorising agent according to claim 1, characterised in that the CaO consists of a CaO containing material or CaCO containing3The material of (1).
3. The dephosphorization agent according to claim 2, wherein said CaO-containing material has a CaO content of 65% by mass or more; said CaCO-containing3Of the material CaCO3The mass content of (A) is more than 65%.
4. Dephosphorization agent according to claim 1, wherein said Fe2O3From Fe-containing2O3Of a material containing FeAl2O4The material of (1).
5. According toThe dephosphorization agent according to claim 4, wherein said Fe is contained2O3Of the material (b) Fe2O3The mass content of (A) is more than 70%; the FeAl-containing component2O4In the material of (1) FeAl2O4The mass content of (A) is more than 40%.
6. Dephosphorization agent according to claim 1, wherein said Al is2O3From Al-containing2O3Of a material containing FeAl2O4The material of (1).
7. Dephosphorization agent according to claim 6, wherein said Al is contained2O3Of the material (A) to (B) is Al2O3The mass content of (A) is more than 65%.
8. Dephosphorization agent according to claim 1, wherein said Na is2O is formed by containing Na2Material of O, containing Na2CO3Or containing Na2SiO3The material of (1).
9. The dephosphorizing agent according to claim 8, wherein said Na is contained2Na in O material2The mass content of O is more than 80 percent; the component containing Na2CO3Na in the material of (1)2CO3The mass content of (A) is more than 80%; the component containing Na2SiO3Na in the material of (1)2SiO3The mass content of (A) is more than 80%.
10. The dephosphorization agent according to any one of claims 1 to 9 for use in a steelmaking process for an iron-containing material, said iron-containing material having a phosphorus content of 0.25 wt% or less.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210326699.5A CN114657326B (en) | 2022-03-30 | 2022-03-30 | Dephosphorization agent and application thereof |
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| CN202210326699.5A CN114657326B (en) | 2022-03-30 | 2022-03-30 | Dephosphorization agent and application thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114657326A true CN114657326A (en) | 2022-06-24 |
| CN114657326B CN114657326B (en) | 2024-04-02 |
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| CN114990276A (en) * | 2022-07-04 | 2022-09-02 | 北京科技大学 | Method for simultaneously pre-desulfurizing and pre-dephosphorizing molten iron |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104278124A (en) * | 2014-10-11 | 2015-01-14 | 中南大学 | Dephosphorizing agent and application thereof |
| CN107849625A (en) * | 2016-01-05 | 2018-03-27 | 新日铁住金株式会社 | Dephosphorising agent, refining agent and the dephosphorization method of molten iron |
| CN109825673A (en) * | 2019-03-26 | 2019-05-31 | 山东钢铁股份有限公司 | A kind of converter dephosphorization agent and its application |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104278124A (en) * | 2014-10-11 | 2015-01-14 | 中南大学 | Dephosphorizing agent and application thereof |
| CN107849625A (en) * | 2016-01-05 | 2018-03-27 | 新日铁住金株式会社 | Dephosphorising agent, refining agent and the dephosphorization method of molten iron |
| CN109825673A (en) * | 2019-03-26 | 2019-05-31 | 山东钢铁股份有限公司 | A kind of converter dephosphorization agent and its application |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114990276A (en) * | 2022-07-04 | 2022-09-02 | 北京科技大学 | Method for simultaneously pre-desulfurizing and pre-dephosphorizing molten iron |
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