CN117862440A - Internal and external composite solid particle covering slag and preparation and use methods thereof - Google Patents
Internal and external composite solid particle covering slag and preparation and use methods thereof Download PDFInfo
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- CN117862440A CN117862440A CN202311781606.9A CN202311781606A CN117862440A CN 117862440 A CN117862440 A CN 117862440A CN 202311781606 A CN202311781606 A CN 202311781606A CN 117862440 A CN117862440 A CN 117862440A
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- 239000002893 slag Substances 0.000 title claims abstract description 65
- 239000002245 particle Substances 0.000 title claims abstract description 39
- 239000002131 composite material Substances 0.000 title claims abstract description 31
- 239000007787 solid Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 51
- 239000010959 steel Substances 0.000 claims abstract description 51
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 26
- 239000000126 substance Substances 0.000 claims abstract description 12
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 5
- 229910004261 CaF 2 Inorganic materials 0.000 claims abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 3
- 239000010439 graphite Substances 0.000 claims abstract description 3
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 3
- 238000005266 casting Methods 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 31
- 239000000843 powder Substances 0.000 claims description 26
- 239000007771 core particle Substances 0.000 claims description 15
- 230000004907 flux Effects 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- 238000005507 spraying Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- 238000011068 loading method Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 239000003595 mist Substances 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 239000011162 core material Substances 0.000 abstract description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 18
- 239000007788 liquid Substances 0.000 abstract description 16
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 8
- 238000002844 melting Methods 0.000 abstract description 7
- 230000008018 melting Effects 0.000 abstract description 7
- 230000005484 gravity Effects 0.000 abstract description 5
- 229940024548 aluminum oxide Drugs 0.000 abstract description 4
- 239000000377 silicon dioxide Substances 0.000 abstract description 4
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 4
- 238000004925 denaturation Methods 0.000 abstract description 3
- 230000036425 denaturation Effects 0.000 abstract description 3
- 230000006866 deterioration Effects 0.000 abstract description 3
- 239000011257 shell material Substances 0.000 description 18
- 238000011160 research Methods 0.000 description 8
- 238000009749 continuous casting Methods 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 235000019484 Rapeseed oil Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000005580 one pot reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
-
- 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
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to an internal and external composite solid particle covering slag and a preparation and use method thereof, wherein single covering slag particles consist of two parts of an outer shell and an inner core, and the inner core comprises the following chemical components in parts by weight: 30-40 parts of CaO and SiO 2 15-25 parts of Al 2 O 3 30 to 40 parts of Li 2 CO 3 2 to 4 parts of MgO, 4 to 8 parts of Na 2 2-4 parts of O and 2-4 parts of graphite; the shell comprises the following chemical components in parts by weight: baCO 3 30-50 parts of CaF 2 30-40 parts of CaO and 30-40 parts of calcium carbonate. The invention can form a double-layer liquid slag structure, the shell is early melted, a layer of liquid slag is formed on the liquid surface of the steel in advance, the melting point is lower, the liquid slag does not interact with aluminum in the molten steel, and compared with the inner core material, the liquid slag has larger specific gravity, the contact between the melted inner core material and the molten steel is isolated, the reaction of aluminum and silicon dioxide in the molten steel is avoided, and the deterioration and the denaturation of the covering slag are prevented.
Description
Technical Field
The invention relates to the field of ferrous metallurgy, in particular to an internal and external composite solid particle covering slag and a preparation and use method thereof.
Background
The continuous casting mold flux is a very important metallurgical auxiliary material, plays roles in heat preservation, secondary oxidation prevention, inclusion absorption, lubrication, heat transfer control and the like in the continuous casting production process, and plays a key role in the forward running of continuous casting production and the control of the quality of casting blanks.
Before the casting powder of the continuous casting crystallizer is applied, rapeseed oil is used for lubricating and heat transferring between a shell and the crystallizer, and the open casting has the defects of poor lubricating and heat transferring performance, large fluctuation of heat flow of the crystallizer, uneven thickness of the shell, short service life of the crystallizer and easy generation of casting blank cracks and steel leakage. The fly ash is mixed with some flux to prepare the covering slag in the 60 th century of 20 th, which is less than the heat loss of vegetable oil, and the steel mill is driven to reduce the superheat degree and the pouring rate of molten steel, thereby improving the quality of casting blanks. Further research shows that fly ash, limestone, soda ash and fluorite can be mixed together to synthesize the covering slag through a series of reactions, the covering slag is in a liquid state between a casting blank and a crystallizer, namely the first-generation powdery covering slag, and then the research of the covering slag is more abundant, and the covering slag comprises black covering slag added with carbon black, newly developed white covering slag, color covering slag and the like. The hollow particle type covering slag has the characteristics of good heat preservation, strong spreadability, uniform components and the like, and is widely applied at present.
Aluminum and its alloy are the most widely used light metal materials in the current metal materials, and the specific gravity of steel can be greatly reduced by adding aluminum to steel, for example, about 10wt% of aluminum is added to steel, and the specific gravity of steel can be reduced by about 15%. Therefore, the development of high-aluminum steel is an important way to achieve the light weight of steel. Meanwhile, due to the special physicochemical properties of aluminum, the aluminum is added into the steel, and certain special properties of the steel, such as corrosion resistance, heat resistance, electromagnetic properties and the like, can be endowed or improved. Based on the above reasons, high-alumina steel is studied and developed seriously, but in industrial production practice, it is found that with the increase of aluminum content in steel, continuous casting process is more and more difficult to run, mainly because aluminum in molten steel reacts with silicon dioxide in casting powder to generate aluminum oxide to enter the casting powder, so that the melting point and viscosity of the casting powder are increased, slag strips are generated to prevent the liquid casting powder from entering a crystallizer air gap, and casting blanks are in direct contact with a crystallizer copper plate, so that bonding steel leakage accidents occur.
Aiming at the applicability problem of the high-aluminum steel casting powder, scientific researchers have conducted a great deal of research and put forward a scheme of non-reactive casting powder, and in order to obtain the component range of the low-reactive casting powder with basic performance meeting the continuous casting requirement, scholars at home and abroad discuss Al 2 O 3 /SiO 2 、Na 2 O、B 2 O 3 、Li 2 The influence of different components such as O and the like and the proportion thereof on the basic performance of the low-reactivity covering slag, and researches show that B is increased 2 O 3 、Li 2 O、Na 2 The O and F-contents are favorable for reducing CaO-Al 2 O 3 The base mold flux melting temperature, while increasing the MgO content increases the mold flux melting temperature; increase B 2 O 3 And Na (Na) 2 The O content can be favorable for reducing CaO-Al 2 O 3 The viscosity of the base mold flux, while increasing the content of MgO, baO, etc. may promote the increase of the viscosity of the mold flux. However, in the range of different components, the influence rule and the action degree of the components on the performance of the mold flux,specific analysis of specific problems is required. In addition, a learner establishes a steel slag reaction dynamics model based on steel slag reaction thermodynamics and dynamics research, and model prediction: increasing the thickness of the liquid slag layer prolongs the time for the reaction of the steel slag to reach equilibrium, and Al in the steel slag 2 O 3 The increase of (2) prolongs the time for the steel slag reaction to reach equilibrium and reduces SiO 2 The content does not affect the reaction rate of the steel slag, but can reduce the Al in the final slag 2 O 3 The content is as follows.
In addition to basic theoretical research and exploration, the scientific research work has also made some attempts in production practice of high-aluminum steel casting powder, one steel mill of Laiwu successfully casts 1.5% aluminum steel grade one pot times, no alarm is given in the use process of the casting powder, the casting blank surface quality is good, other steel mills have similar feedback, but when facing high aluminum content [ Al]>When 1.5% of steel is used, almost all steel plants face the same problems, and the crystallizer continuously alarms in the processes of covering slag agglomeration and continuous casting, and the basic reason is that [ Al ] in molten steel]And SiO in the mold flux 2 React to generate high-melting-point Al 2 O 3 In addition, the composition of the casting powder is changed, the melting point is rapidly increased, a high-melting-point slag bar is formed to prevent the liquid casting powder from entering a gap between the crystallizer and the casting blank, and finally, the casting blank is in direct contact with the crystallizer, the crystallizer frequently alarms, and even steel leakage occurs. Therefore, the research and development of mold flux suitable for casting high aluminum content high aluminum steel is urgent, and intensive research is necessary.
Disclosure of Invention
The invention provides an internal and external composite solid particle covering slag and a preparation and use method thereof, which can form a double-layer liquid slag structure, lead the shell to melt earlier, form a layer of liquid slag on the liquid surface of steel in advance and have lower melting point, have no interaction with aluminum in molten steel, have larger specific gravity compared with an inner core material, isolate the contact between the molten inner core material and the molten steel, avoid the reaction of aluminum and silicon dioxide in the molten steel, and prevent the deterioration and denaturation of the covering slag.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
inside and outside composite solid particlesThe protective slag comprises a shell and an inner core, wherein the inner core comprises the following chemical components in parts by weight: 30-40 parts of CaO and SiO 2 15-25 parts of Al 2 O 3 30 to 40 parts of Li 2 CO 3 2 to 4 parts of MgO, 4 to 8 parts of Na 2 2-4 parts of O and 2-4 parts of graphite; the shell comprises the following chemical components in parts by weight: baCO 3 30-50 parts of CaF 2 30-40 parts of CaO and 30-40 parts of calcium carbonate.
The diameter of the inner core is 1.5-3 mm; the thickness of the shell is 0.5-1 mm.
The preparation method of the internal and external composite solid particle covering slag specifically comprises the following steps:
1) Preparing basic materials of a shell and an inner core: and respectively and uniformly mixing the shell basic material and the inner core basic material by using a ball mill.
Preparing a shell basic material: according to the configuration requirements, chemical components with granularity less than 5mm are selected, the ball mill is used for carrying out uniform mixing treatment, the rotating speed of the cylinder body is 20-30 r/min, the ball loading amount is 30-40%, and the uniform mixing time is 5-10 min.
Preparing an inner core basic material: according to the configuration requirements, chemical components with granularity less than 5mm are selected, the ball mill is used for carrying out uniform mixing treatment, the rotation speed of the cylinder body is 30-40 r/min, the ball loading amount is 30-40%, and the uniform mixing time is 10-15 min.
2) Preparing inner core particles: putting the core basic material after ball milling and mixing into a particle extruder, spreading extruded core particles in an environment with 50-60% of air humidity and 5-10% of carbon dioxide at a particle die hole of 1.5-3 mm, standing for 8-12 hours, then collecting and drying at 100-150 ℃ for 1-2 hours, and finally collecting for standby.
3) Preparing composite solid particle covering slag: preparing composite solid particles by using a disc granulator, wherein the diameter of the disc granulator is 1-2 m, the disc inclination is adjusted by 35-55 degrees, the rotating speed of the disc is 20-40 r/min, firstly adding uniformly mixed shell powder into the disc, starting the disc granulator to the required rotating speed, adding prepared core particles, wherein the weight ratio of the shell powder to the core particles is 0.1-0.18, and the total weight of the shell powder and the core particles is addedThe effective weight of the material is 20-30% of the effective weight of the disc granulator, the disc granulator is kept to rotate for 3-5 min after the material is added, then water mist is sprayed into the material of the disc granulator, the spraying distance is 0.3-0.5 m, the spraying area is required to cover the material area, and the spraying strength is 0.3-0.5L/min.m 2 And after the spraying is completed, continuously rotating the disc granulator for 1-2 min, stopping the disc granulator, screening materials in a collecting disc, selecting composite solid particle covering slag with the size of 2-4 mm, standing for not less than 2 hours, and packaging.
The method for using the internal and external composite solid particle casting powder is to add the casting powder when casting the high-aluminum steel, wherein the addition amount of ton steel is 0.5-0.7 kg/t, and the Al content of the high-aluminum steel is 0.5-8%.
Compared with the prior art, the invention has the beneficial effects that:
1) The preparation method is simple and easy to operate, materials and equipment involved in preparation are easy to obtain, the preparation flow is simple and easy to operate, and batch production and quality control are easy to realize;
2) The covering slag can form a double-layer liquid slag structure, a layer of liquid slag is formed on the liquid surface of the steel in advance, the melting point is lower, the covering slag does not interact with aluminum in the molten steel, and compared with an inner core material, the covering slag has larger specific gravity, the contact between the molten inner core material and the molten steel is isolated, the reaction of aluminum and silicon dioxide in the molten steel is avoided, and the deterioration and the denaturation of the covering slag are prevented;
3) The composite solid particle covering slag is easy to package and store, and can be stored for a long time due to the fact that the inner core particles have certain strength and viscosity, even if the outer shell is placed for pulverization for a long time, the composite solid particle covering slag can be used continuously, and the formation of double-layer liquid slag is not affected.
FIG. 1 is a schematic view of an inner and outer composite solid particle mold flux.
In the figure: 1-outer shell and 2-inner core.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the present invention will be further described with reference to the following examples, which are given for the purpose of illustrating the present invention only and are not limiting the present invention.
Examples:
the chemical composition of the protective slag in the examples is shown in table 1, the parameters of the preparation and use methods of the protective slag in the examples are shown in table 2, and the specific operation steps of the preparation method of the protective slag are as follows:
1) The selection of the shell material and the core material was carried out according to the composition of Table 1, with all material particle sizes < 5mm.
2) Preparation of basic materials: and respectively and uniformly mixing the shell basic material and the inner core basic material by using a ball mill.
3) Preparation of core particles: filling the core basic material subjected to ball milling and mixing into a particle extruder, spreading the extruded core particles in air, standing, collecting the material, drying, and finally collecting for later use;
4) Preparing composite solid particle covering slag: preparing composite solid particles by using a disc granulator, firstly adding shell powder into a disc, starting the disc granulator to a required rotating speed, adding prepared inner core particles, continuously maintaining the disc granulator to rotate after the materials are added, then spraying water mist into the material of the disc granulator, continuously rotating the disc granulator after spraying is finished, stopping the machine to collect the materials in the disc to screen, and packaging after standing for 2 hours, wherein the composite solid particle protection slag with the size of 2-4 mm is selected, so as to obtain the composite solid particle protection slag for high aluminum steel casting.
Table 1 example chemical composition of outer shell material and inner core material (parts)
TABLE 2 example mold flux preparation and use method parameters (I)
Table 2 example mold flux preparation and use method parameters (two)
The casting powder is added during casting of the high-aluminum steel, no high-melting-point casting powder strip is generated during casting, no crystallizer alarm occurs during casting, and the surface quality of the casting blank is good after casting.
Claims (10)
1. The composite solid particle covering slag is characterized in that single covering slag particles consist of two parts of an outer shell and an inner core, and the chemical composition of the inner core is as follows in parts by weight: 30-40 parts of CaO and SiO 2 15-25 parts of Al 2 O 3 30 to 40 parts of Li 2 CO 3 2 to 4 parts of MgO, 4 to 8 parts of Na 2 2-4 parts of O and 2-4 parts of graphite; the shell comprises the following chemical components in parts by weight: baCO 3 30-50 parts of CaF 2 30-40 parts of CaO and 30-40 parts of calcium carbonate.
2. The covering slag of inner and outer composite solid particles according to claim 1, wherein the diameter of the inner core is 1.5-3 mm.
3. The covering slag of inner and outer composite solid particles according to claim 1, wherein the thickness of the outer shell is 0.5-1 mm.
4. A method for preparing the inner and outer composite solid particle mold flux according to any one of claims 1 to 3, comprising the following steps:
1) Preparing basic materials of a shell and an inner core: respectively and uniformly mixing the shell basic material and the inner core basic material by using a ball mill;
2) Preparing inner core particles: filling the ball-milled and uniformly mixed core basic material into a particle extruder, spreading extruded core particles in air at a particle die hole of 1.5-3 mm, standing, then collecting and drying at 100-150 ℃ for 1-2 hours, and finally collecting for later use;
3) Preparing composite solid particle covering slag: preparing composite solid particles by using a disc granulator, firstly adding uniformly mixed shell powder into a disc, starting the disc granulator, adding prepared core particles, wherein the weight ratio of the shell powder to the core particles is 0.1-0.18, continuously maintaining the disc granulator to rotate for 3-5 min after the materials are added, and then spraying water mist into the materials of the disc granulator for a spraying distance of 0.3-0.5 m and a spraying strength of 0.3-0.5L/min.m 2 And after the spraying is completed, continuously rotating the disc granulator for 1-2 min, stopping the disc granulator, screening materials in a collecting disc, selecting composite solid particle covering slag with the size of 2-4 mm, standing for not less than 2 hours, and packaging.
5. The method for preparing the covering slag with the inner and outer composite solid particles according to claim 4, wherein in the step 1), the basic material of the outer shell is prepared: according to the configuration requirements, chemical components with granularity less than 5mm are selected, the ball mill is used for carrying out uniform mixing treatment, the rotating speed of the cylinder body is 20-30 r/min, the ball loading amount is 30-40%, and the uniform mixing time is 5-10 min.
6. The method for preparing the inner and outer composite solid particle covering slag according to claim 4, wherein in the step 1), the inner core basic material is prepared by: according to the configuration requirements, chemical components with granularity less than 5mm are selected, the ball mill is used for carrying out uniform mixing treatment, the rotation speed of the cylinder body is 30-40 r/min, the ball loading amount is 30-40%, and the uniform mixing time is 10-15 min.
7. The method for preparing the covering slag with the inner and outer composite solid particles according to claim 4, wherein in the step 2), the extruded inner core particles are spread in an environment with 50-60% of air humidity and 5-10% of carbon dioxide content for 8-12 hours.
8. The method for preparing the inner and outer composite solid particle casting powder according to claim 4, wherein in the step 3), the diameter of the disc granulator is 1-2 m, the disc inclination is adjusted by 35-55 degrees, and the rotating speed of the disc is 20-40 r/min.
9. The method for preparing the covering slag of the inner and outer composite solid particles according to claim 4, wherein in the step 3), the total weight of the shell powder and the inner core particles is 20% -30% of the effective weight of the disc granulator.
10. A method of using the internal and external composite solid particle casting powder as claimed in any one of claims 1 to 3, wherein the casting powder is added during casting of the high-aluminum steel, the addition amount of ton steel is 0.5 to 0.7kg/t, and the Al content of the high-aluminum steel is 0.5 to 8 percent.
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| KR101818157B1 (en) * | 2016-08-08 | 2018-01-12 | 주식회사 포스코 | Input material and casting method using the same |
| CN109516774A (en) * | 2018-12-27 | 2019-03-26 | 东北大学 | A kind of preparation method of artificial spherical ceramic complex sand |
| CN113278763A (en) * | 2021-05-21 | 2021-08-20 | 马鞍山市兴达冶金新材料有限公司 | Product and method for magnesium or magnesium-calcium treatment of molten steel |
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