CN116987841A - Tundish covering agent for producing high-quality carbon structural steel and preparation method thereof - Google Patents
Tundish covering agent for producing high-quality carbon structural steel and preparation method thereof Download PDFInfo
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- CN116987841A CN116987841A CN202311272768.XA CN202311272768A CN116987841A CN 116987841 A CN116987841 A CN 116987841A CN 202311272768 A CN202311272768 A CN 202311272768A CN 116987841 A CN116987841 A CN 116987841A
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- Prior art keywords
- covering agent
- tundish covering
- slag
- structural steel
- quality carbon
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 32
- 229910000746 Structural steel Inorganic materials 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 58
- 239000002893 slag Substances 0.000 claims abstract description 39
- 239000002699 waste material Substances 0.000 claims abstract description 33
- 239000011449 brick Substances 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 24
- 238000007670 refining Methods 0.000 claims abstract description 24
- 238000003756 stirring Methods 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 21
- 235000011837 pasties Nutrition 0.000 claims abstract description 18
- 235000019738 Limestone Nutrition 0.000 claims abstract description 16
- 239000006028 limestone Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 13
- 235000009566 rice Nutrition 0.000 claims abstract description 13
- 238000007664 blowing Methods 0.000 claims abstract description 12
- 238000005507 spraying Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000001354 calcination Methods 0.000 claims abstract description 7
- 239000003345 natural gas Substances 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 241000209094 Oryza Species 0.000 claims description 12
- 238000009628 steelmaking Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 abstract description 20
- 239000010959 steel Substances 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 11
- 239000012535 impurity Substances 0.000 abstract description 8
- 238000004321 preservation Methods 0.000 abstract description 8
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 240000007594 Oryza sativa Species 0.000 abstract 1
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002994 raw material Substances 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to the technical field of metallurgy, and provides a tundish covering agent for producing high-quality carbon structural steel and a preparation method thereof, wherein the preparation method comprises the following steps: crushing waste converter bricks, adding the crushed waste converter bricks into a stirrer to stir together with blast furnace water slag, adding LF refining slag after stirring uniformly, adding carbonized rice hulls and limestone powder to mix and stir uniformly, adding uniformly into a ball mill to refine and ball mill, adding water until the mixture becomes pasty, pumping the pasty material onto a blowing tower through an injection pump, spraying the pasty material through a nozzle, spraying natural gas below the blowing tower for calcination, and cooling the sintered powder to obtain the tundish covering agent. The prepared tundish covering agent has good heat preservation effect, can effectively adsorb impurities and melt rapidly, can reduce the pollution to molten steel, fully utilizes various waste materials, and realizes waste utilization and low carbon and environmental protection.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a tundish covering agent for producing high-quality carbon structural steel and a preparation method thereof.
Background
The tundish covering agent is a powder particle material covering the steel surface in the tundish and is used for preventing molten steel from absorbing oxygen and radiating heat to the air, and the lower powder layer can be preferably melted into a liquid layer so as to be beneficial to absorbing impurities in the floating steel.
Generally, tundish covering agents which cover the steel surface in the tundish have three main functions: (1) The heat insulation and preservation prevents heat dissipation, plays a role in heat preservation and prevents the molten steel from being cooled too fast; (2) absorbing floating inclusions; (3) Isolating air, preventing oxygen in air from entering molten steel and avoiding secondary oxidation. With the improvement of the requirements on the cleanliness of molten steel (such as the production of high-quality carbon structural steel), the requirements on the tundish covering agent are higher, especially when the high-added-value steel is produced, the requirements on the tundish covering agent are higher, the tundish covering agent has good heat preservation effect, has strong absorption capacity on inclusions, does not pollute the molten steel, and can be melted rapidly.
The invention aims to solve the problems, and provides a tundish covering agent for producing high-quality carbon structural steel and a preparation method thereof.
Disclosure of Invention
Technical problem
The invention provides a tundish covering agent for producing high-quality carbon structural steel and a preparation method thereof, and the prepared tundish covering agent has good heat preservation effect, can effectively adsorb impurities and quickly melt, and can reduce pollution to molten steel.
Technical proposal
The first aspect of the invention provides a preparation method of a tundish covering agent for producing high-quality carbon structural steel, which comprises the following steps: the materials are prepared according to the following proportion: 60-65wt% of ladle refining furnace (LF) refining slag, 30-35wt% of blast furnace slag, 1wt% of waste converter bricks, 1wt% of limestone powder and 2-3wt% of carbonized rice hulls; and crushing the waste converter bricks, adding the crushed waste converter bricks into a stirrer to stir together with blast furnace water slag, adding LF refining slag after uniformly stirring, adding carbonized rice hulls and limestone powder to mix and stir, uniformly stirring, adding the mixture into a ball mill to refine and ball mill, adding water until the mixture becomes pasty, pumping the pasty material onto a blowing tower through a syringe pump, spraying the pasty material through a nozzle, spraying natural gas under the blowing tower for calcination, and cooling the sintered powder to obtain the tundish covering agent.
Further, the blast furnace water slag is produced by cooling waste slag produced by an iron-making blast furnace by water tapping.
Further, the LF refining slag is from waste slag generated in the ladle refining furnace (LF) production process.
Further, the waste converter bricks are from steelmaking converter bricks.
Further, the limestone powder is derived from undersize of converter steelmaking raw materials.
According to a second aspect of the invention, there is provided a tundish covering agent for producing high-quality carbon structural steel, prepared by the method for preparing a tundish covering agent for producing high-quality carbon structural steel according to the first aspect.
Advantageous effects
According to the tundish covering agent for producing high-quality carbon structural steel and the preparation method thereof, the prepared tundish covering agent has good heat preservation effect, can effectively adsorb impurities and melt rapidly, can reduce the pollution to molten steel, fully utilizes various waste materials, and realizes waste utilization and low carbon environment protection.
Detailed Description
For a further understanding of the objects, construction, features, and functions of the invention, reference should be made to the following detailed description of the preferred embodiments.
An embodiment of the first aspect of the present invention provides a method for preparing a tundish covering agent for producing high-quality carbon structural steel, including: the materials are prepared according to the following proportion: 60-65wt% of ladle refining furnace (LF) refining slag, 30-35wt% of blast furnace slag, 1wt% of waste converter bricks, 1wt% of limestone powder and 2-3wt% of carbonized rice hulls; and crushing the waste converter bricks, adding the crushed waste converter bricks into a stirrer to stir together with blast furnace water slag, adding LF refining slag after uniformly stirring, adding carbonized rice hulls and limestone powder to mix and stir, uniformly stirring, adding the mixture into a ball mill to refine and ball mill, adding water until the mixture becomes pasty, pumping the pasty material onto a blowing tower through a syringe pump, spraying the pasty material through a nozzle, spraying natural gas under the blowing tower for calcination, and cooling the sintered powder to obtain the tundish covering agent. The tundish covering agent is formed into a hollow pre-melted form by calcining natural gas so as to be melted and spread in the tundish, thereby being beneficial to covering the surface of molten steel rapidly and simultaneously melting rapidly and absorbing the inclusion floating in the molten steel.
LF refining slag may be from slag generated during ladle refining furnace (LF) production. The waste converter bricks may be derived from steelmaking converter bricks. Limestone powder may be derived from the undersize of the converter steelmaking material. The blast furnace grain slag is produced by cooling slag produced by an iron-making blast furnace by water tapping. Through waste utilization, low carbon and environmental protection are realized, and the production cost of enterprises is also reduced.
The detection assay components of the current commonly used tundish covering agent are as follows:
TABLE 1
Wherein R represents alkalinity, and is CaO content and SiO 2 The ratio of the contents, the alkalinity represents the capability of the tundish covering agent to adsorb impurities.
The main components of the blast furnace granulated slag after detection are:
TABLE 2
Wherein R represents alkalinity, and is CaO content and SiO 2 Content ratio.
The LF refining slag comprises the following main components by detection:
TABLE 3 Table 3
Wherein R represents alkalinity, and is CaO content and SiO 2 Content ratio.
The carbonized rice hulls are detected as follows:
TABLE 4 Table 4
The waste converter bricks comprise the following detection components:
TABLE 5
The limestone powder comprises the following detection components:
TABLE 6
It can be seen from a comparison of tables 1 to 6 that LF refinery slag, blast furnace slag, waste converter bricks, limestone powder and carbonised rice husk substantially cover the main components of the tundish covering agent.
Example 1
Preparing a tundish covering agent for producing high-quality carbon structural steel, which comprises the following steps: the materials are prepared according to the following proportion: 60wt% of ladle refining furnace (LF) refining slag, 35wt% of blast furnace granulated slag, 1wt% of waste converter bricks, 1wt% of limestone powder and 3wt% of carbonized rice hulls; and crushing the waste converter bricks, adding the crushed waste converter bricks into a stirrer to stir together with blast furnace water slag, adding LF refining slag after uniformly stirring, adding carbonized rice hulls and limestone powder to mix and stir, uniformly stirring, adding the mixture into a ball mill to refine and ball mill, adding water until the mixture becomes pasty, pumping the pasty material onto a blowing tower through a syringe pump, spraying the pasty material through a nozzle, spraying natural gas under the blowing tower for calcination, and cooling the sintered powder to obtain the tundish covering agent.
The tundish covering agent prepared according to example 1 has the following main components after inspection:
TABLE 7
Compared with the currently used tundish covering agent in the table 1, the R value is obviously increased, and the capability of adsorbing impurities of the tundish covering agent is improved; the carbon content is reduced, and the influence of the carbon content on molten steel is reduced; reduce Fe 2 O 3 Content is reducedThe oxidizing property is low, and the influence on molten steel under the high-temperature condition is reduced; the MgO content is improved, so that the protection effect on the tundish lining is improved.
Example 2
Preparing a tundish covering agent for producing high-quality carbon structural steel, which comprises the following steps: the materials are prepared according to the following proportion: 65wt% of ladle refining furnace (LF) refining slag, 30wt% of blast furnace granulated slag, 1wt% of waste converter bricks, 1wt% of limestone powder and 3wt% of carbonized rice hulls; and crushing the waste converter bricks, adding the crushed waste converter bricks into a stirrer to stir together with blast furnace water slag, adding LF refining slag after uniformly stirring, adding carbonized rice hulls and limestone powder to mix and stir, uniformly stirring, adding the mixture into a ball mill to refine and ball mill, adding water until the mixture becomes pasty, pumping the pasty material onto a blowing tower through a syringe pump, spraying the pasty material through a nozzle, spraying natural gas under the blowing tower for calcination, and cooling the sintered powder to obtain the tundish covering agent.
The tundish covering agent prepared according to example 2 has the following main components after inspection:
TABLE 8
Compared with the currently used tundish covering agent in the table 1, the R value is obviously increased, and the capability of adsorbing impurities of the tundish covering agent is improved; the carbon content is reduced, and the influence of the carbon content on molten steel is reduced; reduce Fe 2 O 3 The content reduces the oxidability and the influence on molten steel under the high temperature condition; the MgO content is improved, so that the protection effect on the tundish lining is improved.
Temperature drop using prior art tundish covering agent:
TABLE 9
Temperature drop using the tundish covering agent prepared according to example 1:
table 10
Temperature drop using the tundish covering agent prepared according to example 2:
TABLE 11
As can be seen from the comparison of tables 9 to 11, the tundish covering agent according to the embodiment of the invention effectively reduces the temperature drop by about 10 ℃ on average, and achieves better heat preservation effect compared with the tundish covering agent in the prior art.
Comparison of the tundish covering agent prepared according to example 1 before and after use:
table 12
The tundish covering agent prepared according to example 2 was compared before and after use:
TABLE 13
In combination with tables 12 to 13, the center porosity and nonmetallic inclusion level of the covering agent using the examples of the present invention tend to be low-power, so that the covering agent has a good purifying effect on molten steel.
An embodiment of the second aspect of the present invention provides a tundish covering agent for producing high-quality carbon structural steel, which is prepared by the method for preparing a tundish covering agent for producing high-quality carbon structural steel according to the embodiment of the first aspect.
According to the embodiment of the invention, the temperature drop of the tundish covering agent is obviously reduced, the low-power center porosity and nonmetallic inclusion have a descending trend, and in addition, the covering agent is provided with MgO to have a certain protection effect on the tundish, so that FeO in slag is low, and secondary oxidation is effectively reduced.
According to the tundish covering agent for producing high-quality carbon structural steel and the preparation method thereof, the prepared tundish covering agent has a good heat preservation effect, can effectively adsorb impurities and melt rapidly, can reduce the pollution to molten steel, fully utilizes various waste materials, and realizes waste utilization and low carbon environmental protection.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer" orientation or positional relationship are merely for convenience of description and to simplify the description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
The invention has been described with respect to the above-described embodiments, however, the above-described embodiments are merely examples of practicing the invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (6)
1. The preparation method of the tundish covering agent for producing high-quality carbon structural steel is characterized by comprising the following steps of:
the materials are prepared according to the following proportion: 60-65wt% of ladle refining furnace refining slag, 30-35wt% of blast furnace granulated slag, 1wt% of waste converter bricks, 1wt% of limestone powder and 2-3wt% of carbonized rice hulls; and
crushing waste converter bricks, adding the crushed waste converter bricks into a stirrer to stir together with blast furnace water slag, adding ladle refining slag after uniform stirring, adding carbonized rice hulls and limestone powder to mix and stir, uniformly stirring, adding the mixture into a ball mill to refine and ball mill, adding water until the mixture becomes pasty, pumping the pasty material onto a blowing tower through a jet pump, spraying the pasty material through a nozzle, spraying natural gas under the blowing tower for calcination, and cooling the sintered powder to obtain the tundish covering agent.
2. The method for producing a tundish covering agent for the production of high-quality carbon structural steel according to claim 1, characterized in that the ladle refining furnace refining slag is derived from waste slag generated in the ladle refining furnace production process.
3. The method for producing a tundish covering agent for the production of high-quality carbon structural steel according to claim 1, wherein the waste converter bricks are derived from steelmaking converter bricks.
4. The method for producing a tundish covering agent for the production of high-quality carbon structural steel according to claim 1, wherein the limestone powder is derived from undersize materials of converter steelmaking materials.
5. The method for preparing a tundish covering agent for high-quality carbon structural steel production according to claim 1, wherein the blast furnace slag is produced by cooling waste slag produced by an iron-making blast furnace by water.
6. A tundish covering agent for the production of high-quality carbon structural steel, prepared by the method for preparing a tundish covering agent for the production of high-quality carbon structural steel according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311272768.XA CN116987841A (en) | 2023-09-28 | 2023-09-28 | Tundish covering agent for producing high-quality carbon structural steel and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311272768.XA CN116987841A (en) | 2023-09-28 | 2023-09-28 | Tundish covering agent for producing high-quality carbon structural steel and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN116987841A true CN116987841A (en) | 2023-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311272768.XA Pending CN116987841A (en) | 2023-09-28 | 2023-09-28 | Tundish covering agent for producing high-quality carbon structural steel and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000061319A1 (en) * | 1999-04-14 | 2000-10-19 | Styromagnesit Steirische Magnesitindustrie Gmbh | Alkaline covering agent for melting bath surfaces and method for its production |
| CN1970198A (en) * | 2006-12-06 | 2007-05-30 | 上海盛宝钢铁冶金炉料有限公司 | High basicity tundish cover agent and its production method |
| CN101892332A (en) * | 2010-07-05 | 2010-11-24 | 北京科技大学 | Energy-saving slag thermal insulator |
| CN102233413A (en) * | 2011-06-27 | 2011-11-09 | 河南通宇冶材集团有限公司 | Ultra-pure steel corrosion-free type covering agent and production method thereof |
| US20200056254A1 (en) * | 2017-03-31 | 2020-02-20 | South China University Of Technology | Method for manufacturing thin-specification high-ti wear-resistant steel nm450 |
-
2023
- 2023-09-28 CN CN202311272768.XA patent/CN116987841A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000061319A1 (en) * | 1999-04-14 | 2000-10-19 | Styromagnesit Steirische Magnesitindustrie Gmbh | Alkaline covering agent for melting bath surfaces and method for its production |
| CN1970198A (en) * | 2006-12-06 | 2007-05-30 | 上海盛宝钢铁冶金炉料有限公司 | High basicity tundish cover agent and its production method |
| CN101892332A (en) * | 2010-07-05 | 2010-11-24 | 北京科技大学 | Energy-saving slag thermal insulator |
| CN102233413A (en) * | 2011-06-27 | 2011-11-09 | 河南通宇冶材集团有限公司 | Ultra-pure steel corrosion-free type covering agent and production method thereof |
| US20200056254A1 (en) * | 2017-03-31 | 2020-02-20 | South China University Of Technology | Method for manufacturing thin-specification high-ti wear-resistant steel nm450 |
Non-Patent Citations (1)
| Title |
|---|
| 孙翠华等: "钢水过程温度控制技术的研究与实践", 宽厚板, vol. 19, no. 05, pages 22 - 25 * |
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