CN116926272A - Method for improving ladle slag modification effect - Google Patents
Method for improving ladle slag modification effect Download PDFInfo
- Publication number
- CN116926272A CN116926272A CN202310972170.5A CN202310972170A CN116926272A CN 116926272 A CN116926272 A CN 116926272A CN 202310972170 A CN202310972170 A CN 202310972170A CN 116926272 A CN116926272 A CN 116926272A
- Authority
- CN
- China
- Prior art keywords
- ladle
- slag
- tapping
- ladle slag
- carbon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002893 slag Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000000694 effects Effects 0.000 title claims abstract description 7
- 230000004048 modification Effects 0.000 title claims abstract description 7
- 238000012986 modification Methods 0.000 title claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000010079 rubber tapping Methods 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000003607 modifier Substances 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 230000000051 modifying effect Effects 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims abstract 2
- 239000003575 carbonaceous material Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 abstract description 6
- 239000001301 oxygen Substances 0.000 abstract description 6
- 239000000839 emulsion Substances 0.000 abstract description 2
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000011179 visual inspection 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
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
-
- 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
- C21C7/0025—Adding carbon material
-
- 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
- C21C2300/00—Process aspects
- C21C2300/02—Foam creation
-
- 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)
- Analytical Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a method for improving ladle slag modification effect, and belongs to the technical field of ferrous metallurgy. In the method, a carbon-containing material with the weight percentage content of C element being more than or equal to 50% is uniformly added into a ladle in the process from 4/5 of tapping to the end of tapping, the bottom blowing gas amount of the ladle is regulated to be 20-50 NL/h, and a slag modifier is uniformly added into the ladle after the ladle slag is emulsified and foamed after tapping. The carbon-containing material added in the invention reacts with free oxygen in molten steel to generate CO and CO 2 The gas forms slag-gas emulsion with liquid ladle slag in the gas floating process, the ladle slag is emulsified and foamed after tapping, and at the moment, slag modifier is added into the ladle, so that the reaction area of ladle slag and modifier can be increased, the ladle slag modifying effect is improved, and the using amount of modifier is reduced.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and relates to a method for improving ladle slag modification effect.
Background
In the steelmaking process, oxygen transfer can be carried out between the high-oxidability ladle slag and molten steel, so that quality defects are caused, and the usability is affected. In order to reduce the oxidability of ladle slag, the ladle top slag needs to be modified, the adsorption inclusion capacity of the ladle slag is improved, the oxygen transmission between slag and molten steel is reduced, and the purity of the molten steel is improved. At present, the ladle slag modification method mainly comprises the following steps: after tapping, adding modifier into the ladle to reduce the oxidability of ladle slag, but the method is easy to cause oxidation and burning loss of the modifier by molten steel in the ladle, and reduces the utilization rate of the modifier, so that the dosage of the modifier is larger, and the cost is increased.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for improving the modifying effect of ladle slag, which can improve the utilization rate of a modifying agent and reduce the dosage of the modifying agent.
In order to achieve the aim of the invention, the technical scheme adopted by the invention is as follows:
a method for improving ladle slag modification effect, evenly adding carbon-containing materials into a ladle in the process from 4/5 of tapping to the end of tapping, adjusting the bottom blowing gas amount of the ladle to 20-50 NL/h, and evenly adding slag modifier into the ladle after the ladle slag is emulsified and foamed after tapping;
the carbon-containing material contains C element not less than 50 wt% and impurity element not participating in reaction.
Further, the addition amount of the carbon-containing material is 0.05-0.30 kg/t.
Further, the diameter of the carbon-containing material is less than or equal to 10mm, so as to ensure that the carbon-containing material can react with molten steel as soon as possible.
Further, the bottom blowing time is 50-100 s, the purpose of bottom blowing after adding the carbon-containing material is to stir the ladle, and the reaction of carbon element in the carbon-containing material and free oxygen in molten steel is accelerated to generate CO and CO 2 The gas and ladle bottom blowing amount is suitable for visual inspection without exposing molten steel and slag layer surging.
Further, the temperature of the molten steel before tapping is more than or equal to 1600 ℃ so as to ensure that the reaction temperature of carbon element in the carbon-containing material and free oxygen in the molten steel is reached.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the carbon-containing material is uniformly added into a ladle, and free oxygen in molten steel reacts with carbon element in the carbon-containing material to generate CO and CO 2 The gas and the liquid ladle slag form slag-gas emulsion in the gas floating process, namely, a plurality of tiny bubbles are wrapped in the ladle slag to form foam slag, and the ladle slag is emulsified and foamed for about 20-50 seconds after tapping, and at the moment, the slag modifier is uniformly added into the ladle, so that the reaction area of the ladle slag and the modifier can be increased, and the ladle slag modifying effect is improved.
After the method is used, the same modifier is added, the amount of modified ladle slag TFe is reduced by 1-3% compared with the amount of modified ladle slag TFe without the method, the ladle slag modifying effect is improved, and the amount of the modifier is reduced.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following examples. It should be understood that the embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
Examples 1-5 carbonaceous materials were added uniformly starting at 4/5 of the tapping of the steel furnace, the composition of the carbonaceous materials and their weight percentages and diameters are shown in Table 1. To further illustrate the advantages and effects of the present invention, comparative examples 1-5 were added without carbonaceous material.
The temperature of molten steel before tapping, the addition amount of carbon-containing materials, the ladle bottom blowing time and the ladle bottom blowing amount of examples 1-5 and comparative examples 1-5 are shown in Table 2, and the oxidizing property of modified ladle slag is shown in Table 3.
Table 1, examples 1-5 carbon-containing Material composition and weight percentage and diameter
TABLE 2
TABLE 3 oxidizing Properties of ladle slag after modification of examples and comparative examples
The comparison results of the above examples show that the ladle slag TFe modified by the method is reduced by about 2% -4% compared with the ladle slag TFe modified by the method without the method, and the average reduction is 3.1%.
Claims (5)
1. A method for improving the ladle slag modifying effect is characterized in that a carbon-containing material is uniformly added into a ladle in the process from 4/5 of tapping to the end of tapping, the bottom blowing gas amount of the ladle is regulated to 20-50 NL/h, and a slag modifier is uniformly added into the ladle after the ladle slag is emulsified and foamed after tapping;
the carbon-containing material contains C element not less than 50 wt% and impurity element not participating in reaction.
2. The method for improving the ladle slag modifying effect according to claim 1, wherein the method comprises the following steps: the addition amount of the carbon-containing material is 0.05-0.30 kg/t.
3. The method for improving the ladle slag modifying effect according to claim 2, wherein the method comprises the following steps: the diameter of the carbonaceous material is less than or equal to 10mm.
4. A method for improving ladle slag modification effect according to claim 3, wherein: the bottom blowing time is 50-100 s.
5. The method for improving the ladle slag modifying effect according to any one of claims 1 to 4, wherein: the temperature of molten steel before tapping is more than or equal to 1600 ℃.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2023104707805 | 2023-04-27 | ||
| CN202310470780 | 2023-04-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116926272A true CN116926272A (en) | 2023-10-24 |
Family
ID=88394048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310972170.5A Pending CN116926272A (en) | 2023-04-27 | 2023-08-03 | Method for improving ladle slag modification effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116926272A (en) |
-
2023
- 2023-08-03 CN CN202310972170.5A patent/CN116926272A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111206177B (en) | Production method of SWRH82B steel with low acid-soluble aluminum content | |
| CN113512619A (en) | Production method of industrial pure iron | |
| CN114182157A (en) | Preparation method of hot-rolled steel strip for elastic check ring | |
| JP4984946B2 (en) | Hot metal pretreatment method | |
| CN116926272A (en) | Method for improving ladle slag modification effect | |
| EP3674424B1 (en) | Smelting method for ultra-low carbon 13cr stainless steel | |
| CN109338041B (en) | Method for applying limestone to LF refining instead of calcium carbide | |
| JP4079097B2 (en) | Melting method of high clean steel | |
| CN113355477B (en) | Method for realizing high scrap ratio smelting of converter by bottom blowing hydrogen | |
| CN113430331A (en) | Method for eliminating high rare earth stainless steel nozzle nodulation | |
| CN111020115A (en) | Method for refining molten steel outside furnace by using liquid blast furnace slag | |
| CN114411045B (en) | Production method of B-alloy-containing structural steel for automobile parts | |
| JP2003147430A (en) | Reducing agent for steelmaking, and steelmaking method | |
| CN114959163B (en) | Alloying smelting method in converter | |
| CN115369308B (en) | Method for producing high-strength IF steel | |
| JPH06330148A (en) | Method for melting low n steel in vacuum refining furnace | |
| WO2023274222A1 (en) | Calcium treatment method for molten steel | |
| CN115418434B (en) | Production method of low-phosphorus molten iron for carburetion | |
| CN115418441B (en) | Efficient denitrification agent and denitrification method for converter tapping process | |
| CN112921146B (en) | Iron-carbon press ball and using method thereof | |
| JP7480751B2 (en) | METHOD FOR DENITRATION OF MOLTEN STEEL AND METHOD FOR PRODUCING STEEL | |
| CN115404309A (en) | Molten steel deoxidation method | |
| CN111705183A (en) | Novel steelmaking deoxidizer and reduction steelmaking method | |
| CN115418443A (en) | Method for controlling cleanliness of high manganese steel | |
| CN113388716A (en) | Fluorine-free composite molten iron desulfurizer and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |