CN117625885A - Low-melting-point powder spraying desulfurizing agent for RH steel refining and application method thereof - Google Patents
Low-melting-point powder spraying desulfurizing agent for RH steel refining and application method thereof Download PDFInfo
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- CN117625885A CN117625885A CN202311135132.0A CN202311135132A CN117625885A CN 117625885 A CN117625885 A CN 117625885A CN 202311135132 A CN202311135132 A CN 202311135132A CN 117625885 A CN117625885 A CN 117625885A
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- China
- Prior art keywords
- desulfurizing agent
- low
- melting
- point powder
- refining
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 71
- 239000010959 steel Substances 0.000 title claims abstract description 71
- 230000003009 desulfurizing effect Effects 0.000 title claims abstract description 69
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 65
- 238000007670 refining Methods 0.000 title claims abstract description 63
- 239000000843 powder Substances 0.000 title claims abstract description 49
- 238000005507 spraying Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims description 8
- 238000002844 melting Methods 0.000 claims abstract description 24
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims abstract description 22
- 229910052808 lithium carbonate Inorganic materials 0.000 claims abstract description 22
- 230000008018 melting Effects 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 8
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 abstract description 19
- 230000023556 desulfurization Effects 0.000 abstract description 19
- 238000006243 chemical reaction Methods 0.000 abstract description 15
- 230000002035 prolonged effect Effects 0.000 description 6
- 239000011819 refractory material Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010436 fluorite Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
Landscapes
- 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 relates to a low-melting-point powder spraying desulfurizing agent for RH steel refining, which comprises lithium carbonate; the low-melting-point powder spraying desulfurizing agent for RH steel refining comprises the following components in percentage by weight: caO:70% -85%; caF2:10% -15%; li2CO3:1% -5%; siO2:2% -5%; mgO:0 to 3 percent; s:0 to 0.01 percent; the balance being impurities. The low-melting-point powder spraying desulfurizing agent for RH steel refining contains lithium carbonate. The lithium carbonate can reduce the melting point and viscosity of the low-melting point powder spraying desulfurizing agent for RH steel refining, so that the low-melting point powder spraying desulfurizing agent for RH steel refining can be melted more quickly after being blown into molten steel, and the time of desulfurization reaction is increased; meanwhile, the fluidity of the desulfurizing agent after slagging is increased by the lithium carbonate, so that the desulfurization reaction is effectively promoted, the efficiency of the desulfurization reaction is improved, and the desulfurization rate is improved and stabilized.
Description
Technical Field
The embodiment of the invention relates to a desulfurizing agent and an application method thereof in the technical field of external refining of molten steel, in particular to a low-melting-point powder spraying desulfurizing agent for RH steel refining and an application method thereof.
Background
RH vacuum refining technology has undergone several stages of development, such as RH-O- & gtRH-OB- & gtRH-KTB- & gtRH-MFB. The prior RH vacuum refining technology has become a molten steel treatment technology integrating multiple functions of dehydrogenation, decarburization, deoxidation, desulfurization, precise control of molten steel components and temperature, inclusion control and removal and the like, and is widely applied at home and abroad.
At present, when RH steel vacuum refining desulfurization is carried out in a part of domestic steel plants, the powdery desulfurizing agent is generally blown into an RH vacuum refining furnace by using argon through a top lance. After the desulfurizing agent is added by the method, the temperature of the molten steel is suddenly reduced due to low temperature of the desulfurizing agent and high temperature of the molten steel, so that the melting and desulfurizing efficiency of the desulfurizing agent are affected, the molten steel cannot be stably subjected to deep desulfurization, and further the smelting of part of high-quality steel is limited. The prior RH steel vacuum refining desulfurizing agent does not have the function of stabilizing the temperature of molten steel.
Disclosure of Invention
The embodiment of the invention aims to provide a low-melting-point powder injection desulfurizing agent for RH steel refining, which has a function of stabilizing the temperature of molten steel.
In order to achieve the above object, an embodiment of the present invention provides a low melting point powder injection desulfurizing agent for RH steel refining, comprising: the low-melting-point powder spraying desulfurizing agent for RH steel refining contains lithium carbonate; the low-melting-point powder spraying desulfurizing agent for RH steel refining comprises the following components in percentage by weight:
CaO：70％～85％；
CaF 2 ：10％～15％；
Li2CO 3 ：1％～5％；
SiO 2 ：2％～5％；
MgO：0～3％；
S：0～0.01％；
the balance being impurities.
Further, the low-melting point powder injection desulfurizing agent for RH steel refining has a particle size of 0.1-1 mm.
Further, in the low-melting point powder injection desulfurizing agent for RH steel refining of the present invention, the low-melting point powder injection desulfurizing agent for RH steel refining is blown from the top of the vacuum furnace by using a multifunctional oxygen lance during RH vacuum refining.
Embodiments of the present invention provide a method for refining RH steel that is lower than the prior artThe melting point powder spraying desulfurizing agent contains lithium carbonate; the low-melting-point powder spraying desulfurizing agent for RH steel refining comprises the following components in percentage by weight: caO:70% -85%; caF (CaF) 2 ：10％～15％；Li2CO 3 ：1％～5％；SiO 2 :2% -5%; mgO:0 to 3 percent; s:0 to 0.01 percent; the balance being impurities. The low-melting-point powder spraying desulfurizing agent for RH steel refining contains lithium carbonate. The lithium carbonate can reduce the melting point and viscosity of the low-melting point powder spraying desulfurizing agent for RH steel refining, so that the low-melting point powder spraying desulfurizing agent for RH steel refining can be melted more quickly after being blown into molten steel, and the time of desulfurization reaction is increased; meanwhile, the fluidity of the desulfurizing agent after slagging is increased by the lithium carbonate, so that the desulfurization reaction is effectively promoted, the efficiency of the desulfurization reaction is improved, and the desulfurization rate is improved and stabilized.
The invention has the advantages that: lithium carbonate is added into the low-melting-point powder spraying desulfurizing agent for RH steel refining, so that the melting point of the low-melting-point powder spraying desulfurizing agent for RH steel refining is effectively reduced, the heat loss of molten steel is reduced, and the influence of severe temperature change of the molten steel on other reactions of RH refining is prevented. Meanwhile, the melting time of the desulfurizing agent is shortened, the time of the desulfurizing reaction is prolonged, and the removal of sulfur in molten steel is facilitated; the lithium carbonate of the low-melting-point powder spraying desulfurizing agent for RH steel refining is added, so that the viscosity of slag can be reduced, the diffusion rate of the desulfurizing agent is improved, and the efficiency of desulfurization reaction is improved; compared with the conventional RH powder spraying desulfurizing agent, after the lithium carbonate is added into the low-melting-point powder spraying desulfurizing agent for RH steel refining, the consumption of fluorite powder is reduced, the corrosion of CaF2 on the refractory materials of the RH vacuum refining furnace is greatly reduced, the service lives of the parts such as an RH dip pipe, the refractory materials and the like are prolonged, and the steelmaking cost is saved.
Drawings
Without any means for
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the embodiments of the present invention will be provided in connection with. However, those of ordinary skill in the art will understand that in various embodiments of the present invention, numerous technical details have been set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be realized without these technical details and various changes and modifications based on the following embodiments.
The first embodiment of the invention relates to a low-melting-point powder injection desulfurizing agent for RH steel refining, which comprises the following components:
the low-melting-point powder spraying desulfurizing agent for RH steel refining contains lithium carbonate; the low-melting-point powder spraying desulfurizing agent for RH steel refining comprises the following components in percentage by weight:
CaO：70％～85％；
CaF2：10％～15％；
Li2CO3：1％～5％；
SiO2：2％～5％；
MgO：0～3％；
S：0～0.01％；
the balance being impurities.
The low-melting-point powder spraying desulfurizing agent solves the problem that the existing RH steel vacuum refining desulfurizing agent does not have the function of stabilizing the temperature of molten steel, and lithium carbonate is added into the low-melting-point powder spraying desulfurizing agent for RH steel refining, so that the melting point of the low-melting-point powder spraying desulfurizing agent for RH steel refining is effectively reduced, the heat loss of molten steel is reduced, and the influence of severe change of the temperature of molten steel on other reactions of RH refining is prevented. Meanwhile, the melting time of the desulfurizing agent is shortened, the time of the desulfurizing reaction is prolonged, and the removal of sulfur in molten steel is facilitated; the lithium carbonate of the low-melting-point powder spraying desulfurizing agent for RH steel refining is added, so that the viscosity of slag can be reduced, the diffusion rate of the desulfurizing agent is improved, and the efficiency of desulfurization reaction is improved; compared with the conventional RH powder spraying desulfurizing agent, after the lithium carbonate is added into the low-melting-point powder spraying desulfurizing agent for RH steel refining, the consumption of fluorite powder is reduced, the corrosion of CaF2 on the refractory materials of the RH vacuum refining furnace is greatly reduced, the service lives of the parts such as an RH dip pipe, the refractory materials and the like are prolonged, and the steelmaking cost is saved.
The granularity of the low-melting-point powder-spraying desulfurizing agent for refining RH steel in the embodiment is 0.1 mm-1 mm.
The second embodiment of the present invention discloses a method for applying a low-melting point powder injection desulfurizing agent for RH steel refining, wherein the low-melting point powder injection desulfurizing agent for RH refining is blown from the top of a vacuum furnace by using a multifunctional oxygen lance during RH vacuum refining.
In order to illustrate the effect of the low-melting-point powder-spraying desulfurizing agent for RH steel refining in this example, the low-melting-point powder-spraying desulfurizing agent for RH steel refining in this example is used for a desulfurization test in a certain 250 ton KR desulfurization station in China, 10 furnaces are tested in each group of examples on site, and meanwhile, compared with the current desulfurization conditions, the effect is shown in the following table 1:
table 1 comparison of the effect of use in the case of different examples
According to the embodiment, the low-melting-point powder spraying desulfurizer for RH steel refining can be used for high-efficiency desulfurization, low unit consumption, low-temperature drop, no splashing of molten iron and lower temperature drop, the desulfurization efficiency can reach more than 98%, the sulfur content in the molten iron can be reduced to below 0.001%, and basic conditions are provided for smelting high-quality steel; the lithium carbonate is added, so that the melting point of the low-melting point powder spraying desulfurizing agent for RH steel refining is effectively reduced, the heat loss of molten steel is reduced, and the influence of severe temperature change of the molten steel on other reactions of RH refining is prevented. Meanwhile, the melting time of the desulfurizing agent is shortened, the time of the desulfurizing reaction is prolonged, and the removal of sulfur in molten steel is facilitated; the lithium carbonate of the low-melting-point powder spraying desulfurizing agent for RH steel refining is added, so that the viscosity of slag can be reduced, the diffusion rate of the desulfurizing agent is improved, and the efficiency of desulfurization reaction is improved; compared with the conventional RH powder spraying desulfurizing agent, after the lithium carbonate is added into the low-melting-point powder spraying desulfurizing agent for RH steel refining, the consumption of fluorite powder is reduced, the corrosion of CaF2 on the refractory materials of the RH vacuum refining furnace is greatly reduced, the service lives of the parts such as an RH dip pipe, the refractory materials and the like are prolonged, and the steelmaking cost is saved.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the invention and that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (3)
1. A low melting point powder injection desulfurizing agent for RH steel refining, which is characterized by comprising the following components: the low-melting-point powder spraying desulfurizing agent for RH steel refining contains lithium carbonate; the low-melting-point powder spraying desulfurizing agent for RH steel refining comprises the following components in percentage by weight:
CaO：70％～85％；
CaF2：10％～15％；
Li2CO3：1％～5％；
SiO2：2％～5％；
MgO：0～3％；
S：0～0.01％；
the balance being impurities.
2. The low-melting point powder injection desulfurizing agent for RH steel refining according to claim 1, wherein the particle size of the low-melting point powder injection desulfurizing agent for RH steel refining is 0.1 mm-1 mm.
3. The application method of the low-melting-point powder-spraying desulfurizing agent for RH steel refining is characterized in that the low-melting-point powder-spraying desulfurizing agent for RH refining is blown in from the top of a vacuum furnace by using a multifunctional oxygen lance during RH vacuum refining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311135132.0A CN117625885A (en) | 2023-09-05 | 2023-09-05 | Low-melting-point powder spraying desulfurizing agent for RH steel refining and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311135132.0A CN117625885A (en) | 2023-09-05 | 2023-09-05 | Low-melting-point powder spraying desulfurizing agent for RH steel refining and application method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117625885A true CN117625885A (en) | 2024-03-01 |
Family
ID=90022391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311135132.0A Pending CN117625885A (en) | 2023-09-05 | 2023-09-05 | Low-melting-point powder spraying desulfurizing agent for RH steel refining and application method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117625885A (en) |
-
2023
- 2023-09-05 CN CN202311135132.0A patent/CN117625885A/en active Pending
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