CN111286582A - Composite refined pellet, preparation method thereof and steelmaking slagging method - Google Patents
Composite refined pellet, preparation method thereof and steelmaking slagging method Download PDFInfo
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- CN111286582A CN111286582A CN202010213569.1A CN202010213569A CN111286582A CN 111286582 A CN111286582 A CN 111286582A CN 202010213569 A CN202010213569 A CN 202010213569A CN 111286582 A CN111286582 A CN 111286582A
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- refined
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- 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
- C21C7/076—Use of slags or fluxes as treating agents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- 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
- C21C7/06—Deoxidising, e.g. killing
-
- 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)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a composite refined pellet, a preparation method thereof and a steelmaking slagging method, wherein the composite refined pellet comprises SiO2、Al2O3Al and MgO, SiO2、Al2O3And the weight ratio of Al to MgO is 0.01-10: 45-65: 10-15: 0.01-6. The composite refined pellet has the advantages of low melting point and excellent environment-friendly effect, the preparation method has the characteristic of simple and convenient operation, and the steelmaking slagging method has the advantages of low cost, high environment friendliness and small damage to a furnace body.
Description
Technical Field
The invention relates to a composite refined pellet, a preparation method thereof and a steelmaking slagging method, in particular to a composite refined pellet, a preparation method thereof and a steelmaking slagging method.
Background
The melting point of lime used for steel-making and slagging of the LF furnace is 2570 ℃, and a slagging agent is required to be added for melting the lime and rapidly slagging to achieve the purpose. The existing slagging agent contains about 60 percent of fluorite component. The fluorite and lime form a low melting eutectic, with a melting point of about 1360 ℃, which facilitates the melting and slagging of the lime.
The existing slagging agent has the following side effects: 1) the fluorite and the magnesia of the furnace lining can form a eutectic body with the melting point of 1356 ℃, which causes damage to the service life of the furnace lining; 2) the melting point of fluorite is 1424 ℃, and part of fluorite volatilizes and decomposes at the steel-making temperature, so that the harm to human bodies is very serious.
Disclosure of Invention
The invention aims to provide a composite refined pellet, a preparation method thereof and a steelmaking slagging method.
In order to achieve the above object, the present invention provides a composite refined pellet comprising SiO2、Al2O3Al and MgO, SiO2、Al2O3And the weight ratio of Al to MgO is 0.01-10: 45-65: 10-15: 0.01-6.
The invention also provides a preparation method of the composite refined pellet, which comprises the following steps: and (3) extruding and molding the powder raw material.
The invention further provides a steelmaking slagging method, which comprises the following steps: during tapping, adding the composite refined pellets, the alloy, the lime and the calcium carbide into a steel ladle; then, observing the lime melting state when the LF furnace enters the station to determine whether to supplement the composite refined pellets, and determining whether to supplement calcium carbide for deoxidation according to the degree of deoxidation of the slag; when solid lime mass exists in the lime melting state, the composite refined pellets are supplemented until the solid lime mass is completely in a liquid state.
Through the technical scheme, the composite refined pellet provided by the invention contains SiO2、Al2O3Al and MgO, and no fluorite component. Composite refined pellets are used to replace the existing slagging agent, because the pellets contain a large amount of Al2O3Can form calcium aluminate with low melting point such as 12CaO 7A1 with CaO2O3(melting point 1365 ℃ C.) and CaO. A12O3、2CaO·A12O3And the like. Calcium aluminate slag system not only melting pointThe pellet contains metal aluminum powder with strong chemical activity, and the aluminum powder participates in deoxidation, so that the consumption of the deoxidizer calcium carbide is reduced, the alloy yield can be improved, and the use amount of the deoxidizer can be reduced.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a composite refined pellet, which comprises SiO2、Al2O3Al and MgO, SiO2、Al2O3And the weight ratio of Al to MgO is 0.01-10: 45-65: 10-15: 0.01-6.
In the present invention, the contents of the respective components may be selected within a wide range, and in order to further improve the slagging effect of the composite refined pellets, it is preferable that SiO is present2、Al2O3The weight ratio of Al to MgO is 9-10: 45-65: 10-15: 5-6; more preferably, SiO2、Al2O3Al and MgO are powdery, and the average grain sizes respectively and independently satisfy: 0.4-0.9 mm.
The invention also provides a preparation method of the composite refined pellet, which comprises the following steps: and (3) extruding and molding the powder raw material.
In the above-mentioned production method, the pressure of extrusion at the time of molding can be selected within a wide range, and in order to further improve the slagging effect of the composite refined pellets, it is preferable that the pressure of extrusion at the time of molding is 40 to 60 MPa.
The invention further provides a steelmaking slagging method, which comprises the following steps: during tapping, adding the composite refined pellets, the alloy, the lime and the calcium carbide into a steel ladle; then, observing the lime melting state when the LF furnace enters the station to determine whether to supplement the composite refined pellets, and determining whether to supplement calcium carbide for deoxidation according to the degree of deoxidation of the slag; when solid lime mass exists in the lime melting state, the composite refined pellets are supplemented until the solid lime mass is completely in a liquid state.
In the steelmaking and slagging method, the dosage of the composite refined pellets and the calcium carbide can be selected in a wide range, but in order to further improve the slagging effect, the dosage of the composite refined pellets is preferably 550-600kg per furnace and the dosage of the calcium carbide is preferably 70-80kg per furnace, based on a 120T converter.
The present invention will be described in detail below by way of examples.
Example 1
Mixing SiO2、Al2O3Al and MgO as per 8.5: 50: 13: 5.5 weight ratio, extruding into composite refined pellets A1 under 50 MPa; wherein, SiO2、Al2O3The average particle diameters of Al and MgO were all 0.7 mm.
Example 2
Mixing SiO2、Al2O3Al and MgO according to 9: 65: 15: 6 under 50MPa to be extruded into composite refined pellets A2; wherein, SiO2、Al2O3The average particle diameters of Al and MgO were all 0.4 mm.
Example 3
Mixing SiO2、Al2O3Al and MgO as 10: 45: 10: 5 under 50MPa to be extruded into composite refined pellets A3; wherein, SiO2、Al2O3The average particle diameters of Al and MgO were all 0.9 mm.
Example 4
Mixing SiO2、Al2O3Al and MgO as per 0.01: 65: 15: 6 under 50MPa to be extruded into composite refined pellets A4; wherein, SiO2、Al2O3The average particle diameters of Al and MgO were all 0.7 mm.
Example 5
Mixing SiO2、Al2O3Al and MgO as 10: 45: 10: 0.01 weight ratio, extruding into composite refined pellets A5 under 50 MPa; wherein, SiO2、Al2O3The average particle diameters of Al and MgO were all 0.7 mm.
Application example 1
200kg of the composite refined pellets (A1) are added into a steel ladle along with the alloy, lime and calcium carbide required by the steel grade when a 120T converter taps steel, an LF furnace enters a station to observe that the lime is not completely melted, 385kg of the composite refined pellets are added, and the calcium carbide is added according to the deoxidation degree of the furnace slag for deoxidation.
Comparative example 1
200kg of the existing slagging agent (comprising 60 weight percent of CaF and 12 weight percent of SiO) is added when tapping is carried out by a 120T converter218% by weight of Al2O3) Adding the alloy, lime and calcium carbide required by the steel grade into a steel ladle, entering an LF furnace to observe that the lime is not completely melted, supplementing a slagging agent, and supplementing the calcium carbide according to the deoxidation degree of the furnace slag to perform deoxidation.
The material dosage and slagging effect of the comparative example 1 and the application example 1 are shown in the table 1.
TABLE 1
| Comparative example 1 | Example 1 | |
| Slagging agent (kg/furnace) | 505 | 0 |
| Composite refining pellet (kg/furnace) | 0 | 585 |
| Calcium carbide (kg/furnace) | 120 | 77 |
| Lime complete dissolution time/min | 7.5 | 5.1 |
| Deoxidation Effect (FeO wt% in slag) | 0.87 | 0.65 |
Comparative example 1 was compared with application example 1, and the results were as follows:
1) the composite refined pellet has good furnace deoxidation effect, high lime melting speed, and good LF slag fluidity and foam type.
2) Cost comparison benefit: after 585kg of refined composite pellets (unit price of 1.8 yuan/kg) are used, 43kg of calcium carbide (unit price of 4.204 yuan/kg) is saved in each furnace steel, 505kg of slagging agent (unit price of 1.376 yuan/kg) is saved, and the cost is comprehensively reduced by 177 yuan per furnace (585 × 1.8-505 × 1.376-4.204 × 43 is 177).
3) Environmental protection benefit: no fluorite exists after the refined composite pellets are used, and further the pollution to the environment is reduced.
The composite refined pellets in application example 1 are changed into A2-A5, wherein the slagging effect of A2-A3 is basically equivalent to that of A1, and the slagging effect of A4-A6 is slightly inferior to that of A1.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (7)
1. The composite refined pellet is characterized by comprising SiO2、Al2O3Al and MgO, SiO2、Al2O3And the weight ratio of Al to MgO is 0.01-10: 45-65: 10-15: 0.01-6.
2. The composite refined pellet of claim 1, wherein the SiO is2、Al2O3The weight ratio of Al to MgO is 9-10: 45-65: 10-15: 5-6.
3. The composite refined pellet of claim 1, wherein the SiO is2、Al2O3Al and MgO are powdery, and the average grain sizes respectively and independently satisfy: 0.4-0.9 mm.
4. A method for preparing composite refined pellets as claimed in any one of claims 1 to 3, characterized in that the method for preparing comprises: and (3) extruding and molding the powder raw material.
5. The production method according to claim 4, wherein the pressure of the extrusion at the time of molding is 40 to 60 MPa.
6. A steelmaking slagging method is characterized by comprising the following steps: adding the composite refined pellets, the alloy, the lime and the calcium carbide of any one of claims 1 to 3 into a ladle during tapping; then, observing the lime melting state when the LF furnace enters the station to determine whether to supplement the composite refined pellets, and determining whether to supplement calcium carbide for deoxidation according to the degree of deoxidation of the slag;
when solid lime mass exists in the lime melting state, the composite refined pellets are supplemented until the solid lime mass is completely in a liquid state.
7. The steelmaking slag melting method as claimed in claim 6, wherein the dosage of the composite refined pellets is 550 kg per furnace and 600kg per furnace, and the dosage of the calcium carbide is 70-80kg per furnace, based on a 120T converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010213569.1A CN111286582A (en) | 2020-03-24 | 2020-03-24 | Composite refined pellet, preparation method thereof and steelmaking slagging method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010213569.1A CN111286582A (en) | 2020-03-24 | 2020-03-24 | Composite refined pellet, preparation method thereof and steelmaking slagging method |
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| CN111286582A true CN111286582A (en) | 2020-06-16 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1201072A (en) * | 1998-04-07 | 1998-12-09 | 幸超 | Aluminium-contained premelting slag and preparation method therefor, and molten steel desulfurizer and purifier containing same |
| CN1385544A (en) * | 2001-05-15 | 2002-12-18 | 幸超 | Flux for electric furnace steelmaking and its preparation and use method |
| JP3827010B2 (en) * | 2002-12-26 | 2006-09-27 | トピー工業株式会社 | LF treatment method without fluorite |
| CN102517416A (en) * | 2011-12-30 | 2012-06-27 | 重庆大学 | Efficient dephosphorizing agent based on refined steel ladle after-cast recovery slag for revolving furnace |
| CN110106312A (en) * | 2019-03-19 | 2019-08-09 | 新疆中合大正冶金科技有限公司 | A kind of technique using electrolytic aluminium carbon slag production LF slagging agent |
-
2020
- 2020-03-24 CN CN202010213569.1A patent/CN111286582A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1201072A (en) * | 1998-04-07 | 1998-12-09 | 幸超 | Aluminium-contained premelting slag and preparation method therefor, and molten steel desulfurizer and purifier containing same |
| CN1385544A (en) * | 2001-05-15 | 2002-12-18 | 幸超 | Flux for electric furnace steelmaking and its preparation and use method |
| JP3827010B2 (en) * | 2002-12-26 | 2006-09-27 | トピー工業株式会社 | LF treatment method without fluorite |
| CN102517416A (en) * | 2011-12-30 | 2012-06-27 | 重庆大学 | Efficient dephosphorizing agent based on refined steel ladle after-cast recovery slag for revolving furnace |
| CN110106312A (en) * | 2019-03-19 | 2019-08-09 | 新疆中合大正冶金科技有限公司 | A kind of technique using electrolytic aluminium carbon slag production LF slagging agent |
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Application publication date: 20200616 |
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