CN106927838B - Steel fiber reinforced wear-resistant explosion-proof castable - Google Patents
Steel fiber reinforced wear-resistant explosion-proof castable Download PDFInfo
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- CN106927838B CN106927838B CN201710085688.1A CN201710085688A CN106927838B CN 106927838 B CN106927838 B CN 106927838B CN 201710085688 A CN201710085688 A CN 201710085688A CN 106927838 B CN106927838 B CN 106927838B
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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
Abstract
The invention relates to a steel fiber reinforced wear-resistant explosion-proof castable which comprises the following components in percentage by weight: 25-37% of carborundum; 8-12% of mullite powder; 8-12% of tabular corundum powder; 6-10% of alumina micro powder; 3-7% of silicon powder; 5-8% of pure calcium aluminate cement; 1-4% of steel fiber; 5-8% of kyanite, 3-5% of aluminum titanate, 3-5% of chromium oxide, 10-15% of magnesia-alumina spinel and 1-2% of composite explosion-proof agent; 0.5 to 1 percent of water reducing agent; 0.5 to 1 percent of antioxidant. The invention has the beneficial effects that: by improving the components of the casting material in the prior art and adding the steel fiber, the composite explosion-proof agent, the antioxidant and the like, compared with the common high-aluminum casting material, the obtained casting material is not easy to crack, has good wear resistance and strong anti-scouring performance.
Description
Technical Field
The invention relates to a castable for a cement clinker production line, in particular to a steel fiber reinforced wear-resistant explosion-proof castable.
Background
At present, most of castable materials used in cement clinker production lines are common high-alumina castable materials. The common high-aluminum castable has poor thermal shock resistance and anti-scouring performance, so the service life is seriously influenced, the volume is greatly shrunk and changed after being influenced by high temperature, the material is easy to crack during initial baking, the wear resistance is poor, and great inconvenience is brought to production. Therefore, in order to better meet the higher requirements on the performance of the casting material, the thermal shock resistance, the erosion resistance, the volume stability and the like of the common casting material need to be improved.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
Aiming at the technical problems in the related art, the invention provides a steel fiber reinforced wear-resistant explosion-proof castable, which can solve the technical problem that a material bursts under the environment of impact of clinker atmosphere and improve the overall strength and the anti-scouring performance of the material.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:
a steel fiber reinforced wear-resistant explosion-proof castable comprises the following components in percentage by weight: 25-37% of carborundum; 8-12% of mullite powder; 8-12% of tabular corundum powder; 6-10% of alumina micro powder; 3-7% of silicon powder; 5-8% of pure calcium aluminate cement; 1-4% of steel fiber; 5-8% of kyanite, 3-5% of aluminum titanate, 3-5% of chromium oxide, 10-15% of magnesia-alumina spinel and 1-2% of composite explosion-proof agent; 0.5 to 1 percent of water reducing agent; 0.5 to 1 percent of antioxidant.
Further, the composite explosion-proof agent comprises the following components in percentage by weight: 60-80% of aluminum powder; 10-20% of explosion-proof fiber; 10-20% of azodicarbonamide.
Further, the water reducing agent is sodium tripolyphosphate.
Further, the antioxidant is boron carbide.
Further, the raw materials meet the following criteria: the granularity of the carborundum is 1-8mm, and the granularity of the mullite powder is less than or equal to 1mm; the granularity of the plate-shaped corundum powder is 325 meshes; the granularity of the alumina micro powder is 1-3 mu m; the granularity of the silicon micro powder is 0.1-0.3 mu m; the specific surface area of the pure calcium aluminate cement is 5500g/cm2The diameter of the steel fiber is 0.2-0.6mm, the length is 20mm, the particle size of kyanite is less than or equal to 0.2mm, the particle size of aluminum titanate is less than or equal to 0.5mm, the particle size of chromium oxide is less than or equal to 1mm, and the particle size of magnesia-alumina spinel is less than or equal to 12 mm.
According to the weight percentage, the invention selects 25-37% of carborundum, 8-12% of mullite powder and 8-12% of tabular corundum powder as casting aggregate, and replaces the traditional special-grade bauxite clinker aggregate. Carborundum, namely silicon carbide, has stable chemical properties and has the characteristics of high heat conductivity coefficient, small thermal expansion coefficient, high density and hardness and the like; the tabular corundum is pure and has no addition of MgO and B2O3α -Al with coarse crystal and good growth2O3Crystal structure of Al2O3The content of the refractory or castable is more than 99 percent, the sheet-shaped crystal structure has small air holes, more closed air holes and the porosity which is approximately equal to that of the fused corundum, the purity is high, the volume stability is good, the re-sintering shrinkage is extremely small, and the refractory or castable used for production has good thermal shock stability and bending strength after high-temperature treatment; but the sintering performance of corundum and silicon carbide is poor, the high temperature resistance of the finished castable product is poor only by adopting corundum and silicon carbide as aggregates, the oxidation resistance of the finished product at high temperature can be obviously enhanced by adding mullite powder on the basis of silicon carbide and corundum powder, and the mullite hasHas the characteristics of high temperature resistance, strong chemical erosion of the thermal expansion Xiaohekang and the like. The product obtained by using the carborundum, the mullite powder and the tabular corundum as the castable aggregate has strong toughness, can well improve the strength and the anti-scouring performance of a finished product, has strong oxidation resistance at high temperature, is not easy to crack, and can obviously prolong the service life of the castable.
The pure calcium aluminate cement is used as a hardening accelerator of the wear-resistant and explosion-proof castable, the alumina powder is added, and the clay refractory castable is added simultaneously when being mixed and stirred, so that good fluidity is ensured during molding, and the castable can obtain enough strength within a limited time after molding.
According to the weight percentage, the steel fiber is added by 1-4%, and compared with the existing common high-aluminum castable, the high-strength high-fracture castable has the advantages of higher compressive strength and breaking strength, large volume density, and good thermal shock resistance, erosion resistance and volume stability.
The silicon micropowder has the characteristics of micron-sized particle size, amorphous structure, high activity and the like, can fill the pores left after the water of the casting material is discharged, improves the volume density of the casting material, reduces the apparent porosity, and further improves the strength and high-temperature service performance of the casting material. Meanwhile, the silica powder forms colloid in water, so that the fluidity of the castable can be increased.
The kyanite also has the characteristics of strong chemical corrosion resistance, large mechanical strength of thermal shock and the like, generates mullite which is Al at the high temperature of 1300 DEG C2O3SiO 22The only stable binary compound in the system. The castable added with the kyanite has the characteristic of quick baking and no cracking.
The aluminum titanate is a material with low thermal expansion coefficient, and can improve the anti-explosion performance of the castable at high temperature.
The chromium oxide can be well combined with the corundum particles at high temperature, and the surface of the alumina particles can generate solid solution with the chromium oxide, so that the addition of the chromium oxide can promote the sintering of corundum, improve the drying performance of the castable and reduce the linear change rate.
The castable added with the magnesium aluminate spinel has good erosion resistance, abrasion resistance, good thermal shock stability and good spalling resistance.
According to the weight percentage, the composite explosion-proof agent is added by 1-2%, so that the finished castable product is not cracked under the environment of impact of cement clinker atmosphere.
The invention also provides a specific composite explosion-proof agent composition, which comprises the following components in percentage by weight: 60-80% of metal aluminum powder, 10-20% of hollow tubular fiber and 10-20% of azodicarbonamide.
Because the quality of the carbon-containing castable is greatly influenced by the oxidation of carbon, an antioxidant needs to be added into the refractory material for inhibiting the oxidation of the carbon, wherein the silicon micropowder has a certain antioxidant effect, and boron carbide (B) is added on the silicon micropowder4C) Can obtain better antioxidation effect.
The invention has the beneficial effects that: by improving the components of the casting material in the prior art and adding the steel fiber, the composite explosion-proof agent, the antioxidant and the like, compared with the common high-aluminum casting material, the obtained casting material is not easy to crack, has good wear resistance and strong anti-scouring performance.
Detailed Description
The steel fiber reinforced abrasion-resistant and explosion-proof castable of the present invention is further described in detail with reference to the following specific examples, which are provided for the purpose of illustration only and are not intended to limit the present invention, and the various raw materials mentioned in the examples are all common materials in the art and are commercially available:
the first embodiment is as follows:
30Kg of carborundum; 8Kg of mullite powder; 9Kg of plate-shaped corundum powder; 6Kg of alumina micro powder; 5Kg of silicon micropowder; 6Kg of pure calcium aluminate cement; 3Kg of steel fiber; 6Kg of kyanite, 4Kg of aluminum titanate, 5Kg of chromium oxide, 15Kg of magnesia-alumina spinel and 1Kg of composite explosion-proof agent; 1Kg of water reducing agent; 1Kg of antioxidant.
Wherein, the raw materials meet the following indexes: the granularity of the carborundum is 1-8mm, and the granularity of the mullite powder is less than or equal to 1mm; the granularity of the plate-shaped corundum powder is 325 meshes; the granularity of the alumina micro powder is 1-3 mu m; the granularity of the silicon micro powder is 0.1-0.3 mu m; the specific surface area of the pure calcium aluminate cement is 5500g/cm2Steel fiber barThe diameter is 0.2-0.6mm, the length is 20mm, the particle size of kyanite is less than or equal to 0.2mm, the particle size of aluminum titanate is less than or equal to 0.5mm, the particle size of chromium oxide is less than or equal to 1mm, and the particle size of magnesia-alumina spinel is less than or equal to 12 mm.
Wherein, the total amount of the composite explosion-proof agent is 1Kg, and the composition is as follows: 0.8Kg of aluminum powder; 0.1Kg of explosion-proof fiber; azodicarbonamide 0.1 Kg.
Wherein the total amount of the water reducing agent is 1Kg, and the water reducing agent consists of sodium tripolyphosphate.
Wherein the antioxidant accounts for 1Kg, and the composition is boron carbide.
The physical properties of the finished product are determined to meet the following requirements: the volume density of 110 ℃ multiplied by 24h is as follows: 2.7g/cm3(ii) a The flexural strength at 110 ℃ for 24h is as follows: 14.5 MPa; the breaking strength at 1250 ℃ for 3h is as follows: 19.3 MPa; the compressive strength at 110 ℃ for 24h is as follows: 145.2 MPa; the compression strength at 1250 ℃ for 3h is as follows: 186.3 MPa; the linear change rate at 1250 ℃ multiplied by 3h is as follows: -0.02.
Example two:
25Kg of carborundum; 11Kg of mullite powder; 11Kg of plate-shaped corundum powder; 8Kg of alumina micro powder; 4Kg of silicon micropowder; 7Kg of pure calcium aluminate cement; 2Kg of steel fiber; 7Kg of kyanite, 4Kg of aluminum titanate, 5Kg of chromium oxide, 12Kg of magnesia-alumina spinel and 2Kg of composite explosion-proof agent; 1Kg of water reducing agent; 1Kg of antioxidant.
Wherein, the raw materials meet the following indexes: the granularity of the carborundum is 1-8mm, and the granularity of the mullite powder is less than or equal to 1mm; the granularity of the plate-shaped corundum powder is 325 meshes; the granularity of the alumina micro powder is 1-3 mu m; the granularity of the silicon micro powder is 0.1-0.3 mu m; the specific surface area of the pure calcium aluminate cement is 5500g/cm2The diameter of the steel fiber is 0.2-0.6mm, the length is 20mm, the particle size of kyanite is less than or equal to 0.2mm, the particle size of aluminum titanate is less than or equal to 0.5mm, the particle size of chromium oxide is less than or equal to 1mm, and the particle size of magnesia-alumina spinel is less than or equal to 12 mm.
Wherein, the total amount of the composite explosion-proof agent is 2Kg, and the composition is as follows: 1.4Kg of aluminum powder; 0.3Kg of explosion-proof fiber; azodicarbonamide 0.3 Kg.
Wherein the total amount of the water reducing agent is 1Kg, and the water reducing agent consists of sodium tripolyphosphate.
Wherein the antioxidant accounts for 1Kg, and the composition is boron carbide.
The physical properties of the finished product are determined to meet the following requirements: the volume density of 110 ℃ multiplied by 24h is as follows: 2.75g/cm 3; the flexural strength at 110 ℃ for 24h is as follows: 16.3 MPa; the breaking strength at 1250 ℃ for 3h is as follows: 20.6 MPa; the compressive strength at 110 ℃ for 24h is as follows: 175.2 MPa; the compression strength at 1250 ℃ for 3h is as follows: 186.3 MPa; the linear change rate at 1250 ℃ multiplied by 3h is as follows: -0.015.
Example three:
37Kg of carborundum; 8Kg of mullite powder; 9Kg of plate-shaped corundum powder; 7Kg of alumina micro powder; 6Kg of silicon micropowder; 5Kg of pure calcium aluminate cement; 1Kg of steel fiber; 6Kg of kyanite, 5Kg of aluminum titanate, 3Kg of chromium oxide, 10Kg of magnesia-alumina spinel and 2Kg of composite explosion-proof agent; 0.5Kg of water reducing agent; 0.5Kg of antioxidant.
Wherein, the raw materials meet the following indexes: the granularity of the carborundum is 1-8mm, and the granularity of the mullite powder is less than or equal to 1mm; the granularity of the plate-shaped corundum powder is 325 meshes; the granularity of the alumina micro powder is 1-3 mu m; the granularity of the silicon micro powder is 0.1-0.3 mu m; the specific surface area of the pure calcium aluminate cement is 5500g/cm2The diameter of the steel fiber is 0.2-0.6mm, the length is 20mm, the particle size of kyanite is less than or equal to 0.2mm, the particle size of aluminum titanate is less than or equal to 0.5mm, the particle size of chromium oxide is less than or equal to 1mm, and the particle size of magnesia-alumina spinel is less than or equal to 12 mm.
Wherein, the total amount of the composite explosion-proof agent is 2Kg, and the composition is as follows: 1.2Kg of aluminum powder; 0.4Kg of explosion-proof fiber; azodicarbonamide 0.4 Kg.
Wherein the water reducing agent accounts for 0.5Kg and consists of sodium tripolyphosphate.
Wherein the antioxidant accounts for 0.5Kg and consists of boron carbide.
The physical properties of the finished product are determined to meet the following requirements: the volume density of 110 ℃ multiplied by 24h is as follows: 2.78g/cm3(ii) a The flexural strength at 110 ℃ for 24h is as follows: 17.8 MPa; the breaking strength at 1250 ℃ for 3h is as follows: 23.6 MPa; the compressive strength at 110 ℃ for 24h is as follows: 193.2 MPa; the compression strength at 1250 ℃ for 3h is as follows: 210.9 MPa; the linear change rate at 1250 ℃ multiplied by 3h is as follows: -0.09.
Claims (4)
1. The steel fiber reinforced wear-resistant explosion-proof castable is characterized by comprising the following components in percentage by weight: 25-37% of carborundum, 8-12% of mullite powder, 8-12% of tabular corundum powder, 6-10% of alumina micro powder, 3-7% of silicon micro powder, 5-8% of pure calcium aluminate cement, 1-4% of steel fiber, 5-8% of kyanite, 3-5% of aluminum titanate, 3-5% of chromium oxide, 10-15% of magnesium aluminate spinel, 1-2% of composite explosion-proof agent, 0.5-1% of water reducing agent and 0.5-1% of antioxidant; the raw materials meet the following indexes: the grain size of the diamond sand is 1-8mm, and the granularity of the mullite powderLess than or equal to 1mm, the granularity of the plate-shaped corundum powder is 325 meshes, the granularity of the alumina micro powder is 1-3 mu m, the granularity of the silicon micro powder is 0.1-0.3 mu m, and the specific surface area of the pure calcium aluminate cement is 5500g/cm2The diameter of the steel fiber is 0.2-0.6mm, the length is 20mm, the granularity of the kyanite is less than or equal to 0.2mm, the granularity of the aluminum titanate is less than or equal to 0.5mm, the granularity of the chromium oxide is less than or equal to 1mm, and the granularity of the magnesia-alumina spinel is less than or equal to 12 mm.
2. The steel fiber reinforced wear-resistant explosion-proof castable according to claim 1, wherein the composite explosion-proof agent comprises, in weight percent: 60-80% of aluminum powder, 10-20% of explosion-proof fiber and 10-20% of azodicarbonamide.
3. The steel fiber reinforced wear-resistant explosion-proof castable according to claim 1, wherein the water reducing agent is sodium tripolyphosphate.
4. The steel fiber reinforced wear-resistant explosion-proof castable according to claim 1, wherein the antioxidant is boron carbide.
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