CN113321511A - Drainage sand for clean steel production and preparation method thereof - Google Patents
Drainage sand for clean steel production and preparation method thereof Download PDFInfo
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- CN113321511A CN113321511A CN202110884018.2A CN202110884018A CN113321511A CN 113321511 A CN113321511 A CN 113321511A CN 202110884018 A CN202110884018 A CN 202110884018A CN 113321511 A CN113321511 A CN 113321511A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/44—Consumable closure means, i.e. closure means being used only once
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
- C04B2235/425—Graphite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5427—Particle size related information expressed by the size of the particles or aggregates thereof millimeter or submillimeter sized, i.e. larger than 0,1 mm
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
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- Carbon And Carbon Compounds (AREA)
Abstract
The invention provides drainage sand for clean steel production and a preparation method thereof, and belongs to the technical field of metallurgical refractory materials. The drainage sand is prepared by roasting silicon carbide particles with the average particle size of 50-500 micrometers at 1100-1650 ℃, and forming SiC-SiO after roasting2Particles of a coated structure. Uniformly mixing the roasted particles and 1-20 parts of medium-carbon or high-carbon graphite to form SiC-SiO2-C composite drainage sand. Wherein SiC is used to support the bulk grain structure, SiO, when in contact with high temperature molten steel2Reacts with molten steel to form a top-layer sintered layer, and the graphite C plays a role in lubricating during casting. The drainage sand provided by the invention has the advantages of simple components, loose particles and high self-opening rate, and SiC and graphite can be further deoxidized after entering a molten steel bath, thereby being beneficial to the production of high-quality clean steel。
Description
Technical Field
The invention relates to the technical field of metallurgical refractory materials, in particular to drainage sand for clean steel production and a preparation method thereof.
Background
The production of high-quality clean steel is an important way for realizing the high-quality development of the steel industry in China. The drainage sand is a bulk steelmaking auxiliary material filled in the ladle pocket brick and the upper nozzle, and is put into the ladle pocket brick before tapping of the primary smelting furnace to prevent molten steel from flowing out during tapping. When pouring steel, the sliding plate is opened and then discharged, and the drainage sand plays a role in guiding the steel flow. The quality of the drainage sand greatly restricts the automatic casting rate of the ladle, and if the ladle cannot be automatically opened, oxygen is required to be burnt for casting, so that the molten steel is seriously polluted while the production rhythm is influenced. The high automatic casting rate of the ladle plays an important role in stabilizing the continuous casting operation process, protecting the casting and producing clean steel. The drainage sand is in a high-temperature state for a long time at a ladle nozzle, and a sintering layer (slag shell) generated by the reaction of the drainage sand and molten steel is required to have high refractoriness; in the using process, the drainage sand bears larger ferrostatic pressure, so that the drainage sand is required to have very good fluidity and the friction force among particles is as small as possible in order to prevent material collapse; in addition, the drainage sands require sufficient strength at high temperatures to effectively support the upper material. Most of the drainage sands in the current market are forsterite, siliceous, zircon and chromium drainage sands, however, most of the drainage sands entering the molten steel can pollute the molten steel, form large inclusions and influence the stable production of high-quality clean steel.
Based on the current situation, the invention researches and designs a brand-new drainage sand for producing clean steel and a preparation method thereof.
Disclosure of Invention
The invention aims to provide drainage sand for clean steel production and a preparation method thereof.
The drainage sand is prepared from silicon carbide particles and graphite as raw materials, wherein the mass fraction of the graphite is 1-20%.
Wherein the average size of the silicon carbide particles is 50-500 microns, and the purity is more than 99%. The graphite is medium-carbon or high-carbon graphite, and the average size of the graphite is 100-1000 microns.
The preparation method of the drainage sand comprises the following steps:
(1) carrying out high-temperature roasting on the silicon carbide particles;
(2) crushing the particles roasted in the step (1) to obtain SiC-SiO2Particles;
(3) uniformly mixing the particles obtained in the step (2) with graphite to obtain SiC-SiO2-C composite drainage sand.
Wherein the roasting temperature in the step (1) is 1100-1650 ℃, and the uniformly mixed material is directly put into a furnace and heated along with the furnace.
The roasting time in the step (1) is 10 min-5 h.
In the step (1), the calcination is carried out in the air or oxygen-rich atmosphere.
And (3) after the roasting in the step (1) is finished, air cooling to 50-200 ℃, and then carrying out the crushing operation in the step (2).
SiC-SiO obtained after crushing in step (2)2The particles have an average particle size of 50 to 1000 microns.
In the steps (2) and (3), the roasted particles are crushed by one or more of mechanical stirring, ultrasonic uniform mixing and flowing uniform mixing, and the graphite and the roasted and crushed particles are uniformly mixed to obtain the SiC-SiO for producing the clean steel2-C composite drainage sand.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the drainage sand is simple in raw material composition and simple in preparation process. Produced SiC-SiO2the-C drainage sand has the advantages of high structural strength of materials and loose and easily-filled particles; the graphite contained in the ladle can play a good lubricating role, the ladle is high in self-casting rate, and the realization of protective casting is facilitated. In addition, this drainage sand has further deoxidation effect after getting into the molten steel to improve the molten steel cleanliness factor, this is a outstanding advantage of this drainage sand.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description is given with reference to specific embodiments.
The invention provides drainage sand for clean steel production and a preparation method thereof.
The drainage sand is prepared from silicon carbide particles and graphite serving as raw materials, wherein the mass fraction of the graphite is 1-20%, and the balance is silicon carbide particles.
Wherein the graphite is medium-carbon or high-carbon graphite, and the average size of the graphite is 100-1000 microns.
The silicon carbide particles have an average size of 50 to 500 μm.
The preparation method of the drainage sand comprises the following steps:
(1) carrying out high-temperature roasting on the silicon carbide particles;
(2) crushing the particles roasted in the step (1) to obtain SiC-SiO2Particles;
(3) uniformly mixing the particles obtained in the step (2) with graphite to obtain SiC-SiO2-C composite drainage sand.
The drainage sand has good fluidity, enough strength and high self-opening rate, and can well assist the continuous casting process.
Example 1
100 kg of silicon carbide particles with the average particle size of 300 microns are placed in a muffle furnace, heated to 1350 ℃ along with the furnace, and then roasted for 150 minutes, wherein the atmosphere in the furnace is air.
After the baking and sintering, taking out the powder, naturally cooling the powder in the air, cooling the powder to about 110 ℃, and then putting the powder into a ball mill for crushing to obtain SiC-SiO2The coated structured particle of (1).
Then, adding 5 kg of high-carbon graphite into the ball mill, continuing ball milling for 2 hours, and uniformly mixing to obtain SiC-SiO for producing clean steel2-C composite drainage sand particles.
Example 2
60 kilograms of silicon carbide particles with the average particle size of 500 microns are placed in a muffle furnace, the silicon carbide particles are heated to 1200 ℃ along with the furnace and then are roasted for 30 minutes, the atmosphere in the furnace is oxygen-enriched air, and the flow of the introduced oxygen is 10L/min.
After the baking and sintering are finished, stopping introducing oxygen; taking out the powder, naturally cooling in air, cooling to about 50 ℃, and crushing the powder in a stirrer to obtain SiC-SiO2The coated structured particle of (1).
Then, 6 kg of high-carbon graphite is added into the stirrer, and the mixture is continuously stirred in the stirrer for 1 hour and uniformly mixed to obtain the SiC-SiO for producing the clean steel2-C composite drainage sand particles.
Example 3
20 kg of silicon carbide particles with the average particle size of 100 microns are placed in a tubular furnace, the silicon carbide particles are heated to 1150 ℃ along with the furnace and then are roasted for 10 minutes, the atmosphere in the furnace is oxygen-enriched air, and the flow of the introduced oxygen is 15L/min.
After the baking and sintering are finished, stopping introducing oxygen; taking out the powder, naturally cooling in air, cooling to about 50 ℃, and crushing the powder in a stirrer to obtain SiC-SiO2The coated structured particle of (1).
Subsequently, 1.5 kg of medium carbon graphite is added into the ball mill, and SiC-SiO is added2Continuously stirring the coated structure particles for 0.5 hour for uniformly mixing to obtain the SiC-SiO for producing the clean steel2-C composite drainage sand particles.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The utility model provides a clean drainage sand for steel production which characterized in that: the graphite is prepared from silicon carbide particles and graphite as raw materials, wherein the mass fraction of the graphite is 1-20%.
2. The flow guiding sand for producing clean steel according to claim 1, which is characterized in that: the average size of the silicon carbide particles is 50-500 micrometers, and the purity of the silicon carbide particles is more than 99%.
3. The flow guiding sand for producing clean steel according to claim 1, which is characterized in that: the graphite is medium-carbon or high-carbon graphite, and the average size of the graphite is 100-1000 microns.
4. The preparation method of the drainage sand for producing clean steel according to claim 1, which is characterized by comprising the following steps: the method comprises the following steps:
(1) carrying out high-temperature roasting on the silicon carbide particles;
(2) crushing the particles roasted in the step (1) to obtain SiC-SiO2Particles;
(3) uniformly mixing the particles obtained in the step (2) with graphite to obtain SiC-SiO2-C composite drainage sand.
5. The preparation method of the drainage sand for producing clean steel according to claim 4, which is characterized by comprising the following steps: the roasting temperature in the step (1) is 1100-1650 ℃.
6. The preparation method of the drainage sand for producing clean steel according to claim 4, which is characterized by comprising the following steps: the roasting time in the step (1) is 10 min-5 h.
7. The preparation method of the drainage sand for producing clean steel according to claim 4, which is characterized by comprising the following steps: the roasting in the step (1) is carried out in air or oxygen-rich atmosphere.
8. The preparation method of the drainage sand for producing clean steel according to claim 4, which is characterized by comprising the following steps: the crushing and uniformly mixing method in the steps (2) and (3) is one or more of mechanical stirring, ultrasonic mixing and flowing and uniformly mixing.
9. The preparation method of the drainage sand for producing clean steel according to claim 4, which is characterized by comprising the following steps: SiC-SiO obtained after crushing in the step (2)2The average particle size of the particles is 50-1000 microns.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110884018.2A CN113321511B (en) | 2021-08-03 | 2021-08-03 | Drainage sand for clean steel production and preparation method thereof |
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| CN202110884018.2A CN113321511B (en) | 2021-08-03 | 2021-08-03 | Drainage sand for clean steel production and preparation method thereof |
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| CN113321511A true CN113321511A (en) | 2021-08-31 |
| CN113321511B CN113321511B (en) | 2021-10-22 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4174970A (en) * | 1977-05-20 | 1979-11-20 | Didier-Werke A.G. | Refractory composition |
| US4218254A (en) * | 1978-03-21 | 1980-08-19 | Societe Europeenne Des Produits Refractaires | Refractory compositions suitable for preparing low water-content injectable pastes |
| CN102659425A (en) * | 2012-04-19 | 2012-09-12 | 沈阳东北大学冶金技术研究所有限公司 | Passivated drainage sand with coating for ladle refining and preparation method thereof |
| CN105903918A (en) * | 2016-06-21 | 2016-08-31 | 郑州东升冶金新材料有限公司 | Silicon-carbon drainage agent and preparation method thereof |
-
2021
- 2021-08-03 CN CN202110884018.2A patent/CN113321511B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4174970A (en) * | 1977-05-20 | 1979-11-20 | Didier-Werke A.G. | Refractory composition |
| US4218254A (en) * | 1978-03-21 | 1980-08-19 | Societe Europeenne Des Produits Refractaires | Refractory compositions suitable for preparing low water-content injectable pastes |
| CN102659425A (en) * | 2012-04-19 | 2012-09-12 | 沈阳东北大学冶金技术研究所有限公司 | Passivated drainage sand with coating for ladle refining and preparation method thereof |
| CN105903918A (en) * | 2016-06-21 | 2016-08-31 | 郑州东升冶金新材料有限公司 | Silicon-carbon drainage agent and preparation method thereof |
Non-Patent Citations (5)
| Title |
|---|
| （苏）布德尼柯夫（П.П.БУДНИКОВ）著；徐忠本译: "《陶瓷和耐火材料工艺学 第2册 耐火材料工艺学》", 30 September 1958 * |
| SAISAI LI ET.AL: "Fabrication of graphitic carbon spheres and their application in Al2O3-SiC-C refractory castables", 《INT J APPL CERAM TECHNOL.》 * |
| WAGNER DA SILVEIRA AND GUIDO FALK: "Functionalized Cellular Carbon-MgO Composites: From Interface Processing to Thermal Shock Resistant Low-Carbon MgO-C Refractories", 《ADVANCED ENGINEERING MATERIALS》 * |
| 刘锋 等: "引流砂含水量对钢包自动开浇率的影响", 《耐火材料》 * |
| 马征明: "精炼钢包水口引流砂的研制与应用", 《耐火材料》 * |
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