CN110845248A - Steel-making ladle bottom castable - Google Patents
Steel-making ladle bottom castable Download PDFInfo
- Publication number
- CN110845248A CN110845248A CN201911325491.6A CN201911325491A CN110845248A CN 110845248 A CN110845248 A CN 110845248A CN 201911325491 A CN201911325491 A CN 201911325491A CN 110845248 A CN110845248 A CN 110845248A
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- Prior art keywords
- castable
- waste
- steel
- ladle bottom
- parts
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Classifications
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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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1324—Recycled material, e.g. tile dust, stone waste, spent refractory material
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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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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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
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/447—Phosphates or phosphites, e.g. orthophosphate, hypophosphite
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- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention belongs to the technical field of refractory materials, and particularly relates to a bottom castable for a steelmaking ladle. The invention aims to solve the technical problem of providing a steel-making ladle bottom castable which comprises the following raw materials: 30-45.5 parts of special-grade alumina aggregate, 55-65 parts of waste RH insert tube castable, 7-8.5 parts of alumina micropowder, an additive accounting for 0.8-1.5% of the total weight of the three raw materials, 0.2-1% of a bonding agent and 0.1-0.3% of a water reducing agent. The castable is used for the bottom of a steel-making ladle, and has the advantages of low price, good high-temperature strength, good molten steel scouring resistance effect, no molten steel pollution and the like.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a bottom castable for a steelmaking ladle.
Background
After the 70 s in the 20 th century, steel-making enterprises have developed rapidly, and the steel-making enterprises are characterized by fast process speed, centralized investment and gradually improved technology. The consumption of refractory materials brought by the method is thousands of tons, the waste refractory materials generated after the use are more than 400 thousands of tons, and the development speed of steel enterprises is far behind in the treatment of the waste refractory materials. The waste refractory materials are often mixed with other garbage for treatment, the reutilization rate of the waste refractory materials is low, and the relative part of treatment mode is mainly burying. According to the relevant literature, the domestic waste refractory material reutilization rate is about 30%, and the foreign steel mill waste refractory material reutilization rate is about 80%. The low reutilization rate of domestic waste refractory materials causes a great deal of resource waste and environmental pollution, and the contradiction is increasingly prominent at present when mineral resources are increasingly exhausted and environmental pollution is zero tolerance. Aiming at the aspect of waste RH inserting pipes, the castable on the used waste inserting pipes is removed by some enterprises, only the steel structure is recovered to be treated as scrap steel, and the steel structure with small damage to some parts is repaired and reused. The dismantled castable has a lot of impurities in contact with the molten steel surface, most of the castable also contains steel fibers, the recycling difficulty is high, the performance of the produced product is unstable, and the like, so that the castable is not recycled.
At present, the bottom castable of the steel-making ladle is generally knotted by alumina aggregate, and has relatively poor molten steel scouring resistance and strength.
Disclosure of Invention
The invention aims to solve the technical problem of providing a steel-making ladle bottom castable. The ladle bottom castable for the steelmaking ladle comprises the following raw materials: 30-45.5 parts of special-grade alumina aggregate, 55-65 parts of waste RH insert tube castable, 7-8.5 parts of alumina micropowder, an additive accounting for 0.8-1.5% of the total weight of the three raw materials, 0.2-1% of a bonding agent and 0.1-0.3% of a water reducing agent.
Specifically, in the ladle bottom castable for steelmaking ladles, Al in the special-grade alumina aggregate2O3Not less than 85.0%, and volume density not less than 3.2g/cm3. Aggregates having a particle size of more than 1mm are referred to as aggregates.
Specifically, in the ladle bottom castable for the steel ladle, the waste RH insert tube castable is obtained by sorting and removing iron from recycled RH insert tube castable.
Further, in the ladle bottom castable for the steel ladle, the physical and chemical indexes of the castable for the waste RH insert tube are as follows: al (Al)2O3≥85.0％，MgO≤5.0％。
Further, in the ladle bottom castable for the steel ladle, the granularity of the castable for the waste RH insertion tube is 0-25 mm.
Specifically, in the castable for the bottom of the steel-making ladle, the granularity of the alumina micro powder is more than or equal to 325 meshes.
Specifically, in the castable for the bottom of the steel-making ladle, the additive is an explosion-proof fiber.
Specifically, in the castable for the bottom of the steel-making ladle, the binder is silica micropowder.
Specifically, in the steel-making ladle bottom castable, the water reducing agent is sodium hexametaphosphate.
The castable disclosed by the invention adopts the recycled castable for the RH insert tube as a main raw material, fully utilizes waste secondary resources, reduces the waste in the steelmaking industry, generates good social benefits and has a good popularization value. The castable disclosed by the invention has the advantages of low price, good high-temperature strength, good molten steel scouring resistance effect, no pollution to molten steel and the like, has better strength in each temperature interval, the strength is more than 50MPa at 1500 ℃ for 3h, the linear change is 0.3-0.8%, and the service life of a ladle reaches more than 18 times.
Detailed Description
The invention screens and removes iron from the recycled RH insert tube castable to obtain the waste RH insert tube castable which is used for producing the ladle bottom castable of the steel-making ladle, and the castable comprises the following raw materials: 30-45.5 parts of special-grade alumina aggregate, 55-65 parts of waste RH insert tube castable, 7-8.5 parts of alumina micropowder, an additive accounting for 0.8-1.5% of the total weight of the three raw materials, 0.2-1% of a bonding agent and 0.1-0.3% of a water reducing agent.
In the castable disclosed by the invention, impurities in the recycled RH insert tube castable are selected to be clean, and after large iron blocks are removed, the physical and chemical indexes are as follows: al (Al)2O3More than or equal to 85.0 percent and less than or equal to 5.0 percent of MgO, namely the waste RH insert tube casting material as the raw material of the casting material.
The raw materials are weighed according to the proportion, and are mixed by a forced stirrer, and then are packaged and used in a moisture-proof way.
The physical and chemical index requirements of the waste RH insert tube castable and the special-grade alumina aggregate adopted by the embodiment of the invention are shown in the following table 1:
TABLE 1
Test examples
The invention uses the waste RH insert tube casting material as the main raw material to produce the ladle bottom casting material, in order to ensure that the ladle bottom casting material obtains better physical and chemical properties and meets the use requirements. Six schemes are designed, various raw materials are added according to different parts by mass, the physical and chemical properties of the ladle bottom castable are observed, and finally the parts by mass of the raw materials are determined.
Under different proportions of the raw materials, the physical and chemical properties of the ladle bottom castable are inspected, a scheme with low cost and good physical and chemical properties is selected for industrial tests, and the proportions are detailed in table 2.
TABLE 2
Preparing 2 kg of small samples according to the designed mass ratio by using a laboratory balance, adding water into each scheme by using a laboratory micro-stirrer respectively, mixing for 5 minutes, then putting each scheme of the mixed samples into 3 steel moulds with the thickness of 40mm multiplied by 160mm, naturally curing for 24 hours, demoulding, placing the mixed samples in a constant-temperature 120 ℃ oven after standing for 72 hours at normal temperature, and taking out the samples after keeping for 24 hours. Two samples of each protocol were then held in a muffle oven at 900 ℃ and 1500 ℃ for 3 hours, respectively, and the measured intensity and line changes are shown in Table 3:
TABLE 3 detection of dry vibration materials at different temperatures
The phenomenon of 1500 ℃ multiplied by 3h of a small sample is observed through tests: when the mass part of the waste RH insert tube castable is increased, the strength is in an increasing trend, but when the part reaches 63, the strength begins to be reduced, and the linear change is in a remarkable increasing trend, so that the mass part of the waste RH insert tube castable is in a reasonable range when 63 is reached. Therefore, the technical method for recycling the castable of the waste RH insert tube determines the following ranges of the raw materials in parts by mass, namely the raw materials of the castable for the bottom of the steel-making ladle are obtained: 30-45.5 parts of special-grade alumina aggregate, 55-65 parts of RH insert tube castable, 7-8.5 parts of alumina micropowder, an additive accounting for 0.8-1.5% of the total weight of the three raw materials, 0.2-1% of a bonding agent and 0.1-0.3% of a water reducing agent.
The scheme 5 is adopted for industrial tests, the service life of the steel ladle can reach 24 furnaces when the steel ladle is used in a certain steel plant with 120 tons, and the average service life is more than 18 furnaces, so that the planned target is achieved.
The ladle bottom castable produced according to the mass ratio has the advantages of simple process, stable product performance, capability of effectively reducing the production cost, secondary utilization of waste resources, good social benefit and better application prospect.
Claims (9)
1. The bottom castable for the steelmaking ladle is characterized in that: the method comprises the following raw materials: 30-45.5 parts of special-grade alumina aggregate, 55-65 parts of waste RH insert tube castable, 7-8.5 parts of alumina micropowder, an additive accounting for 0.8-1.5% of the total weight of the three raw materials, 0.2-1% of a bonding agent and 0.1-0.3% of a water reducing agent.
2. The steelmaking ladle bottom castable of claim 1, wherein: al in the special-grade alumina aggregate2O3Not less than 85.0%, and volume density not less than 3.2g/cm3。
3. The steelmaking ladle bottom castable of claim 1, wherein: the waste RH insert pipe casting material is obtained by sorting and deironing the recycled RH insert pipe casting material.
4. The steelmaking ladle bottom castable according to claim 1 or 3, characterized in that: the physical and chemical indexes of the waste RH insert tube castable are as follows: al (Al)2O3≥85.0％，MgO≤5.0％。
5. The steelmaking ladle bottom castable according to claim 1 or 3, characterized in that: the granularity of the casting material of the waste RH insert tube is 0-25 mm.
6. The steelmaking ladle bottom castable of claim 1, wherein: the granularity of the alumina micro powder is more than or equal to 325 meshes.
7. The steelmaking ladle bottom castable of claim 1, wherein: the additive is an explosion-proof fiber.
8. The steelmaking ladle bottom castable of claim 1, wherein: the binding agent is silicon micropowder.
9. The steelmaking ladle bottom castable of claim 1, wherein: the water reducing agent is sodium hexametaphosphate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911325491.6A CN110845248A (en) | 2019-12-20 | 2019-12-20 | Steel-making ladle bottom castable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911325491.6A CN110845248A (en) | 2019-12-20 | 2019-12-20 | Steel-making ladle bottom castable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110845248A true CN110845248A (en) | 2020-02-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911325491.6A Pending CN110845248A (en) | 2019-12-20 | 2019-12-20 | Steel-making ladle bottom castable |
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| Country | Link |
|---|---|
| CN (1) | CN110845248A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101580398A (en) * | 2009-06-29 | 2009-11-18 | 河南省耕生耐火材料有限公司 | Ladle kerb casting material and ladle kerb preparation method thereof |
| CN103373855A (en) * | 2012-04-25 | 2013-10-30 | 宝山钢铁股份有限公司 | Regenerative steel ladle repair material |
-
2019
- 2019-12-20 CN CN201911325491.6A patent/CN110845248A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101580398A (en) * | 2009-06-29 | 2009-11-18 | 河南省耕生耐火材料有限公司 | Ladle kerb casting material and ladle kerb preparation method thereof |
| CN103373855A (en) * | 2012-04-25 | 2013-10-30 | 宝山钢铁股份有限公司 | Regenerative steel ladle repair material |
Non-Patent Citations (1)
| Title |
|---|
| 周川生等著: "《连铸"三大件"生产与使用 整体塞棒、长水口、浸入式水》", 31 January 2015, 冶金工业出版社 * |
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Application publication date: 20200228 |
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