CN111646809A - Castable for permanent layer of steel ladle - Google Patents
Castable for permanent layer of steel ladle Download PDFInfo
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- CN111646809A CN111646809A CN202010428400.8A CN202010428400A CN111646809A CN 111646809 A CN111646809 A CN 111646809A CN 202010428400 A CN202010428400 A CN 202010428400A CN 111646809 A CN111646809 A CN 111646809A
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- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
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- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
- C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium
Abstract
The invention provides a ladle permanent layer castable which is prepared from the following raw materials in parts by weight: 60-70 parts of black aluminum sand aggregate, 15-20 parts of white corundum fine powder, 5-15 parts of alpha alumina micro powder, 0.5-1.5 parts of fiber, 0.1-0.5 part of silica micro powder, 5-10 parts of a binding agent, 0.1-1 part of a water reducing agent, 0.01-0.05 part of metal aluminum powder and 0.01-0.05 part of citric acid; the binding agent is one or more of pure calcium aluminate cement, hydrated alumina and silica-alumina gel powder; the water reducing agent is one or two of sodium tripolyphosphate and sodium hexametaphosphate. The invention has the following beneficial effects: the black aluminum sand which is a byproduct in the ilmenite industry is used as the main raw material aggregate, so that the slag is recycled, the environment is protected, and the production cost of the castable is reduced; the strength and the erosion resistance of the castable product can be improved by adding the white corundum fine powder and the alumina micro powder into the preparation raw materials.
Description
Technical Field
The invention relates to the technical field of refractory material preparation, in particular to a ladle permanent layer castable.
Background
With the rapid development of modern metallurgical technology, the performance requirements of the metallurgical industry on the refractory materials for the steel ladle are higher and higher. In order to prolong the service life of the ladle and reduce the manufacturing cost of ton steel, the using amount of the refractory materials of the ladle is increased year by year. The castable of the permanent layer of the steel ladle is not only a key material for determining the service life of the steel ladle, but also an important defense line for ensuring the safe operation of the steel ladle, so the castable of the permanent layer of the steel ladle is required to have good heat preservation effect and certain anti-erosion capability, and the phenomenon of ladle penetration is avoided.
However, the raw materials of the conventional ladle permanent layer castable mainly comprise alumina or corundum, so that the manufacturing cost of the ladle permanent layer castable is high, the corrosion resistance of the ladle permanent layer castable is poor, and the safety is low. Therefore, a ladle permanent layer castable with low cost and strong erosion resistance is urgently needed.
Disclosure of Invention
The invention provides a ladle permanent layer castable, which solves the problems of high manufacturing cost and poor anti-erosion capability of the ladle permanent layer castable in the prior art.
The technical scheme of the invention is realized as follows:
a ladle permanent layer castable is prepared from the following raw materials in parts by weight: 60-70 parts of black aluminum sand aggregate, 15-20 parts of white corundum fine powder, 5-15 parts of alpha alumina micro powder, 0.5-1.5 parts of fiber, 0.1-0.5 part of silica micro powder, 5-10 parts of a binding agent, 0.1-1 part of a water reducing agent, 0.01-0.05 part of metal aluminum powder and 0.01-0.05 part of citric acid; the binding agent is pure calcium aluminate cement; the water reducing agent is one or two of sodium tripolyphosphate and sodium hexametaphosphate.
Preferably, the black aluminum sand aggregate is composed of the following black aluminum sand particles in parts by weight: 10-20 parts of black alumina sand particles with the particle size of 8-5 mm, 5-15 parts of black alumina sand particles with the particle size of 5-3 mm, 15-25 parts of black alumina sand particles with the particle size of 3-1 mm and 15-25 parts of black alumina sand particles with the particle size of 1-0 mm.
Preferably, the content of titanium oxide in the black aluminum sand aggregate is 10-20%, the content of potassium oxide is 0.01-0.1%, the content of sodium oxide is 0.01-0.1%, and the balance is calcium aluminate.
Preferably, the alumina content in the white corundum fine powder is not less than 99%.
Preferably, the alpha alumina micro powder consists of the following alpha alumina micro powder particles in parts by weight: 5-10 parts of alpha alumina micro powder particles with the particle size of 1 micron and 1-5 parts of alpha alumina micro powder particles with the particle size of 3 microns.
Preferably, the fiber is a mixture of steel fiber and organic fiber, wherein the weight ratio of the organic fiber to the steel fiber is 1: 10-1: 5.
Preferably, the particle size of the metal aluminum powder is 80 meshes.
The invention has the beneficial effects that:
the black aluminum sand which is a byproduct in the ilmenite industry is used as the main raw material aggregate, so that the slag is recycled, the environment is protected, and the production cost of the castable is reduced; the black aluminum sand has high aluminum content and contains a certain amount of titanium, can form some medium temperature phases, and has good thermal shock effect and high safety factor; the black aluminum sand is porous, the density is low, the heat conductivity coefficient is small, the temperature loss of the prepared castable can be reduced, and the temperature of the steel ladle shell can be effectively reduced.
The strength and the erosion resistance of the castable product can be improved by adding the white corundum fine powder and the alumina micro powder into the preparation raw materials; the black aluminum sand, the white corundum micro powder and the alumina micro powder in the raw materials react with the high-alumina cement in the binding agent at high temperature to generate a stable solid solution phase, so that the erosion resistance of the castable product is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A ladle permanent layer castable is prepared from the following raw materials in parts by weight: 14 parts of black aluminum sand particles with the particle size of 8-5 mm, 8 parts of black aluminum sand particles with the particle size of 5-3 mm, 19 parts of black aluminum sand particles with the particle size of 3-1 mm, 19 parts of black aluminum sand particles with the particle size of 1-0 mm, 8 parts of 200-mesh white corundum fine powder, 7 parts of 325-mesh white corundum fine powder, 4 parts of 1-micron alpha alumina micro powder, 1 part of 3-micron alpha alumina micro powder, 0.06 part of steel fiber, 0.44 part of organic fiber, 0.1 part of silicon micro powder, 5 parts of pure calcium aluminate cement, 0.1 part of sodium hexametaphosphate, 0.01 part of metal aluminum powder and 0.01 part of citric acid.
Mixing the raw materials according to the set particle size and proportion, dry-mixing for 3 minutes, adding 5.2 percent (wt) of water, stirring for 5 minutes, vibrating, casting and molding to prepare a standard strip-shaped sample of 40 mm x 160 mm, naturally curing for 24 hours, demoulding, putting the sample into an oven, and drying for 24 hours at the temperature of 110 ℃ to obtain a finished sample block of the ladle permanent layer castable.
Through test detection, the prepared finished sample block of the ladle permanent layer castable has the advantages of 16% of apparent porosity, 2.85g/cm3 of volume density, 88.5MPa of room-temperature compressive strength, 15.2MPa of room-temperature rupture strength, good thermal shock resistance and good oxidation resistance at room temperature.
Through test detection, the prepared finished sample block of the castable of the permanent layer of the steel ladle is sintered at the temperature of 1400 ℃, the temperature is kept for 3 hours, the porosity of the cooled finished sample block is 21 percent, the volume density is 2.73g/cm3, the normal-temperature compressive strength is 90.8MPa, the normal-temperature rupture strength is 19.3MPa, the thermal shock resistance is good, and the corrosion resistance is good.
Example 2
A ladle permanent layer castable is prepared from the following raw materials in parts by weight: 16 parts of black aluminum sand particles with the particle size of 8-5 mm, 12 parts of black aluminum sand particles with the particle size of 5-3 mm, 21 parts of black aluminum sand particles with the particle size of 3-1 mm, 21 parts of black aluminum sand particles with the particle size of 1-0 mm, 11 parts of white corundum fine powder with the particle size of 200 meshes, 9 parts of white corundum fine powder with the particle size of 325 meshes, 12 parts of alpha alumina micro powder with the particle size of 1 micron, 3 parts of alpha alumina micro powder with the particle size of 3 microns, 0.2 part of steel fiber, 1.3 parts of organic fiber, 0.5 part of silicon micro powder, 10 parts of pure calcium aluminate cement, 1 part of sodium tripolyphosphate, 0.05 part of metal aluminum powder and 0.05 part of citric acid.
Mixing the raw materials according to the set particle size and proportion, dry-mixing for 3 minutes, adding 5.2 percent (wt) of water, stirring for 5 minutes, vibrating, casting and molding to prepare a standard strip-shaped sample of 40 mm x 160 mm, naturally curing for 24 hours, demoulding, sintering the sample at 1100 ℃, and preserving heat for 3 hours to obtain a finished product sample block of the ladle permanent layer casting material.
Through test detection, the prepared finished sample block of the ladle permanent layer castable has the advantages of 16% of apparent porosity, 2.84g/cm3 of volume density, 91.8MPa of room-temperature compressive strength, 16.9MPa of room-temperature rupture strength, good thermal shock resistance and good oxidation resistance at room temperature.
Through test detection, the prepared finished sample block of the castable of the permanent layer of the steel ladle is sintered at the temperature of 1400 ℃, the temperature is kept for 3 hours, the porosity of the cooled finished sample block is 20 percent, the volume density is 2.75g/cm3, the normal-temperature compressive strength is 96.7MPa, the normal-temperature rupture strength is 20.1MPa, the thermal shock resistance is good, and the corrosion resistance is good.
Example 3
A ladle permanent layer castable is prepared from the following raw materials in parts by weight: 15 parts of black aluminum sand particles with the particle size of 8-5 mm, 10 parts of black aluminum sand particles with the particle size of 5-3 mm, 20 parts of black aluminum sand particles with the particle size of 3-1 mm, 20 parts of black aluminum sand particles with the particle size of 1-0 mm, 9.5 parts of white corundum fine powder with 200 meshes, 8 parts of white corundum fine powder with 325 meshes, 8 parts of alpha alumina micro powder with the particle size of 1 micron, 2 parts of alpha alumina micro powder with the particle size of 3 microns, 0.1 part of steel fiber, 0.9 part of organic fiber, 0.3 part of silicon micro powder, 7.5 parts of pure calcium aluminate cement, 0.55 part of sodium hexametaphosphate, 0.03 part of metal aluminum powder and 0.03 part of citric acid.
Mixing the raw materials according to the set particle size and proportion, dry-mixing for 3 minutes, adding 5.2 percent (wt) of water, stirring for 5 minutes, vibrating, casting and molding to prepare a standard strip-shaped sample of 40 mm x 160 mm, naturally curing for 24 hours, demoulding, sintering the sample at 1400 ℃, and preserving heat for 3 hours to obtain a finished product of the ladle permanent layer casting material.
Through test detection, the prepared finished sample block of the ladle permanent layer castable has the advantages of 16% of apparent porosity, 2.86g/cm3 of volume density, 92.5MPa of room-temperature compressive strength, 17.3MPa of room-temperature rupture strength, good thermal shock resistance and good oxidation resistance at room temperature.
Through test detection, the prepared finished sample block of the castable of the permanent layer of the steel ladle is sintered at the temperature of 1400 ℃, the temperature is kept for 3 hours, the apparent porosity of the cooled finished sample block is 20 percent, the volume density is 2.75g/cm3, the normal-temperature compressive strength is 96.7MPa, the normal-temperature rupture strength is 23.3MPa, the thermal shock resistance is good, and the corrosion resistance is good.
Example 4
A ladle permanent layer castable is prepared from the following raw materials in parts by weight: 15 parts of black aluminum sand particles with the particle size of 8-5 mm, 10 parts of black aluminum sand particles with the particle size of 5-3 mm, 20 parts of black aluminum sand particles with the particle size of 3-1 mm, 20 parts of black aluminum sand particles with the particle size of 1-0 mm, 10 parts of white corundum fine powder with 200 meshes, 7 parts of white corundum fine powder with 325 meshes, 7 parts of alpha alumina micro powder with the particle size of 1 micron, 4 parts of alpha alumina micro powder with the particle size of 3 microns, 1 part of steel fiber, 0.15 part of organic fiber, 0.5 part of silicon micro powder, 5 parts of pure calcium aluminate cement, 0.3 part of sodium hexametaphosphate, 0.02 part of metal aluminum powder and 0.03 part of citric acid.
Mixing the raw materials according to the set granularity and proportion, dry-mixing for 3 minutes, adding 5.2 percent (wt) of water, stirring for 5 minutes, vibrating, casting and molding to prepare a standard strip-shaped sample of 40 mm x 160 mm, naturally curing for 24 hours, demoulding, putting the sample into an oven, and drying for 24 hours at the temperature of 110 ℃ to obtain a finished sample block of the ladle permanent layer castable.
Through test detection, the prepared finished sample block of the ladle permanent layer castable has the advantages of 15% of apparent porosity, 2.87g/cm3 of volume density, 98.6MPa of room-temperature compressive strength, 20.7MPa of room-temperature rupture strength, good thermal shock resistance and good oxidation resistance at room temperature.
Through test detection, the prepared finished sample block of the castable of the permanent layer of the ladle is sintered at the temperature of 1400 ℃, the temperature is kept for 3 hours, the porosity of the cooled finished sample block is 20 percent, the volume density is 2.76g/cm3, the normal-temperature compressive strength is 105.3MPa, the normal-temperature rupture strength is 23.9MPa, the thermal shock resistance is good, and the corrosion resistance is good.
Example 5
A ladle permanent layer castable is prepared from the following raw materials in parts by weight: 15 parts of black aluminum sand particles with the particle size of 8-5 mm, 15 parts of black aluminum sand particles with the particle size of 5-3 mm, 15 parts of black aluminum sand particles with the particle size of 3-1 mm, 20 parts of black aluminum sand particles with the particle size of 1-0 mm, 9 parts of white corundum fine powder with the particle size of 200 meshes, 7 parts of white corundum fine powder with the particle size of 325 meshes, 7 parts of alpha alumina micro powder with the particle size of 1 micron, 4 parts of alpha alumina micro powder with the particle size of 3 microns, 1 part of steel fiber, 0.15 part of organic fiber, 0.5 part of silicon micro powder, 6 parts of pure calcium aluminate cement, 0.3 part of sodium hexametaphosphate, 0.02 part of metal aluminum powder and 0.03 part of citric acid.
Mixing the raw materials according to the set granularity and proportion, dry-mixing for 3 minutes, adding 5.2 percent (wt) of water, stirring for 5 minutes, vibrating, casting and molding to prepare a standard strip-shaped sample of 40 mm x 160 mm, naturally curing for 24 hours, demoulding, putting the sample into an oven, and drying for 24 hours at the temperature of 110 ℃ to obtain a finished sample block of the ladle permanent layer castable.
Through test detection, the prepared finished sample block of the ladle permanent layer castable has the advantages of 16% of apparent porosity, 2.86g/cm3 of volume density, 94.6MPa of room-temperature compressive strength, 20.5MPa of room-temperature rupture strength, good thermal shock resistance and good oxidation resistance at room temperature.
Through test detection, the prepared finished sample block of the castable of the permanent layer of the steel ladle is sintered at the temperature of 1400 ℃, the temperature is kept for 3 hours, the porosity of the cooled finished sample block is 20 percent, the volume density is 2.78g/cm3, the normal-temperature compressive strength is 115.3MPa, the normal-temperature rupture strength is 22.6MPa, the thermal shock resistance is good, and the corrosion resistance is good.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The castable for the permanent layer of the steel ladle is characterized by being prepared from the following raw materials in parts by weight: 60-70 parts of black aluminum sand aggregate, 15-20 parts of white corundum fine powder, 5-15 parts of alpha alumina micro powder, 0.5-1.5 parts of fiber, 0.1-0.5 part of silica micro powder, 5-10 parts of a binding agent, 0.1-1 part of a water reducing agent, 0.01-0.05 part of metal aluminum powder and 0.01-0.05 part of citric acid; the binding agent is pure calcium aluminate cement; the water reducing agent is one or two of sodium tripolyphosphate and sodium hexametaphosphate.
2. The ladle permanent layer castable according to claim 1, wherein the black alumina sand aggregate is composed of the following black alumina sand particles in parts by weight: 10-20 parts of black alumina sand particles with the particle size of 8-5 mm, 5-15 parts of black alumina sand particles with the particle size of 5-3 mm, 15-25 parts of black alumina sand particles with the particle size of 3-1 mm and 15-25 parts of black alumina sand particles with the particle size of 1-0 mm.
3. The ladle permanent layer castable according to claim 1, wherein the content of titanium oxide in the black alumina sand aggregate is 10% -20%, the content of potassium oxide is 0.01% -0.1%, the content of sodium oxide is 0.01% -0.1%, and the balance is calcium aluminate.
4. The ladle permanent layer castable according to claim 1, wherein the alumina content in the white corundum fine powder is not less than 99%.
5. The ladle permanent layer castable according to claim 1, wherein the alpha alumina micropowder consists of the following alpha alumina micropowder particles in parts by weight: 5-10 parts of alpha alumina micro powder particles with the particle size of 1 micron, and 1-5 parts of alpha alumina micro powder particles with the particle size of 3 microns.
6. The ladle permanent layer castable according to claim 1, wherein the fiber is a mixture of steel fiber and organic fiber, and the weight ratio of the organic fiber to the steel fiber is 1: 10-1: 5.
7. The ladle permanent layer castable according to claim 1, wherein the metal aluminum powder has a particle size of 80 mesh.
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| CN202010428400.8A CN111646809A (en) | 2020-05-19 | 2020-05-19 | Castable for permanent layer of steel ladle |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112125688A (en) * | 2020-09-28 | 2020-12-25 | 北京利尔高温材料股份有限公司 | Castable for slag runner |
| CN112500175A (en) * | 2021-02-05 | 2021-03-16 | 北京利尔高温材料股份有限公司 | Light high-strength steel ladle permanent layer castable and preparation method thereof |
| CN113149673A (en) * | 2021-05-08 | 2021-07-23 | 泰兴市恒信特种耐火材料有限公司 | Aluminum-silicon castable added with sinking beads and preparation method thereof |
Citations (10)
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| CN112125688A (en) * | 2020-09-28 | 2020-12-25 | 北京利尔高温材料股份有限公司 | Castable for slag runner |
| CN112500175A (en) * | 2021-02-05 | 2021-03-16 | 北京利尔高温材料股份有限公司 | Light high-strength steel ladle permanent layer castable and preparation method thereof |
| CN113149673A (en) * | 2021-05-08 | 2021-07-23 | 泰兴市恒信特种耐火材料有限公司 | Aluminum-silicon castable added with sinking beads and preparation method thereof |
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