CN119462185A - Non-cement high-chromium castable and preparation method thereof - Google Patents
Non-cement high-chromium castable and preparation method thereof Download PDFInfo
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- CN119462185A CN119462185A CN202411697340.4A CN202411697340A CN119462185A CN 119462185 A CN119462185 A CN 119462185A CN 202411697340 A CN202411697340 A CN 202411697340A CN 119462185 A CN119462185 A CN 119462185A
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- 239000011651 chromium Substances 0.000 title claims abstract description 63
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 53
- 239000004568 cement Substances 0.000 title claims abstract description 11
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 53
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910000423 chromium oxide Inorganic materials 0.000 claims abstract description 34
- 239000006104 solid solution Substances 0.000 claims abstract description 31
- QRRWWGNBSQSBAM-UHFFFAOYSA-N alumane;chromium Chemical compound [AlH3].[Cr] QRRWWGNBSQSBAM-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 28
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 12
- 239000011029 spinel Substances 0.000 claims abstract description 12
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 11
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 5
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910001928 zirconium oxide Inorganic materials 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 19
- 239000003638 chemical reducing agent Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 7
- -1 magnesium-chromium-aluminum Chemical group 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 239000012258 stirred mixture Substances 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 4
- UDYLZILYVRMCJW-UHFFFAOYSA-L disodium;oxido carbonate Chemical compound [Na+].[Na+].[O-]OC([O-])=O UDYLZILYVRMCJW-UHFFFAOYSA-L 0.000 claims description 4
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 3
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 3
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 230000035939 shock Effects 0.000 abstract description 12
- 239000011230 binding agent Substances 0.000 abstract description 8
- 150000004645 aluminates Chemical class 0.000 abstract description 6
- 239000000292 calcium oxide Substances 0.000 abstract description 6
- 230000003628 erosive effect Effects 0.000 abstract description 6
- 239000002893 slag Substances 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract 1
- 239000011819 refractory material Substances 0.000 description 7
- 229910052599 brucite Inorganic materials 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229920005646 polycarboxylate Polymers 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
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- Ceramic Products (AREA)
Abstract
本发明公开了一种无水泥高铬浇注料及其制备方法，以氧化铬熔块或铬铝固溶体颗粒、氧化铬细粉、氧化铝微粉为主要原料，添加氧化锆微粉、氧化镁细粉、氧化硅微粉等，通过振动成型制备而成无水泥高铬浇注料；本发明工艺简单，不使用传统的铝酸盐水泥作为结合剂，制备的无水泥高铬浇注料降低了气孔率、提高了体积密度、耐压强度和抗折强度，由于浇注料在使用中有尖晶石生成，且浇注料中不含氧化钙，明显改善高铬浇注料的热震性能和抗渣侵蚀性能。The invention discloses a cement-free high-chromium castable and a preparation method thereof. Chromium oxide frit or chromium-aluminum solid solution particles, chromium oxide fine powder and aluminum oxide micropowder are used as main raw materials, zirconium oxide micropowder, magnesium oxide fine powder and silicon oxide micropowder are added, and the cement-free high-chromium castable is prepared by vibration molding. The invention has a simple process and does not use traditional aluminate cement as a binder. The prepared cement-free high-chromium castable has reduced porosity and improved bulk density, compressive strength and flexural strength. Since spinel is generated in the castable during use and calcium oxide is not contained in the castable, the thermal shock resistance and slag erosion resistance of the high-chromium castable are significantly improved.
Description
Technical Field
The invention belongs to the technical field of refractory castable, and mainly relates to a cement-free high-chromium castable and a preparation method thereof.
Background
At present, calcium aluminate water is adopted as a main binding agent in the unshaped refractory castable, namely, the cement-bonded castable occupies a main position in the refractory castable. However, as the use conditions in the pyrometallurgical industry become more and more severe, new requirements are also put forth on the refractory material, and the thermal shock performance is the ability of the refractory material to maintain a certain strength without failure under the action of thermal stress, and the thermal stress causes cracks to occur in the refractory material product, gradually causes crack growth and partial peeling of the product, and finally causes the product to be damaged. Therefore, the thermal shock performance of the refractory material is an important index for evaluating the high-temperature service performance of the refractory material, and the excellent thermal shock performance is directly related to the service life of the refractory material.
The high-chromium castable generally adopts aluminate cement as a binder, is formed by adding water and vibrating, has the advantages of convenient construction, simple operation, high refractoriness, high strength, strong slag erosion resistance and the like, is widely applied, but is applied to high-temperature industry, and needs higher thermal shock resistance of refractory materials.
Disclosure of Invention
The invention provides a cement-free high-chromium castable and a preparation method thereof, wherein chromium oxide frit or chromium aluminum solid solution, chromium oxide fine powder and aluminum oxide fine powder are used as main raw materials, zirconium oxide fine powder, magnesium oxide fine powder, silicon oxide fine powder and the like are added, and the cement-free high-chromium castable is prepared through vibration molding, and the influence of CaO on slag erosion resistance of the material is reduced without using traditional aluminate cement as a binding agent.
The invention adopts the technical scheme that the cement-free high-chromium castable is provided, and the raw materials comprise, by weight, 60-70 parts of chromium oxide frit or chromium aluminum solid solution particles, 6-20 parts of chromium oxide fine powder, 2-10 parts of alumina micro powder, 2-5 parts of zirconia micro powder, 0.5-6 parts of magnesium oxide fine powder, 0.5-3 parts of active silica micro powder and 0.1-0.15 part of water reducer.
Wherein the content of Cr 2O3 in the chromium oxide frit particles is more than or equal to 99wt%; the content of the chromium-aluminum solid solution in the chromium-aluminum solid solution particles is more than or equal to 95wt percent, the content of Cr 2O3 in the chromium-aluminum solid solution is more than or equal to 85wt percent, and the grain size grading of the particles is that the grain size grading accounts for 25-40wt percent of 5-3mm, 25-45 wt percent of 3-1mm and 20-35wt percent of 1-0.1 mm.
Wherein the content of Cr 2O3 in the chromium oxide fine powder is more than or equal to 99wt percent, and the granularity is less than or equal to 88 mu m.
Wherein the content of Al 2O3 in the alumina fine powder is more than or equal to 99wt percent, and the granularity is less than or equal to 5 mu m.
Wherein the content of ZrO 2 in the zirconia fine powder is more than or equal to 99wt percent, and the granularity is less than or equal to 5 mu m.
Wherein the MgO content in the magnesium oxide fine powder is more than or equal to 97wt percent, and the granularity is less than or equal to 44 mu m.
Wherein the SiO 2 content in the silicon oxide fine powder is more than or equal to 94wt% and the granularity is less than or equal to 5 mu m.
Wherein the water reducer is one of PC-80, PC-A and sodium hexametaphosphate+SM water reducer.
The preparation method of the cement-free high-chromium castable comprises the following steps:
Firstly, weighing and proportioning according to the original addition materials and parts by weight of the anhydrous high-chromium castable;
step two, firstly uniformly mixing the chromium oxide frit or chromium aluminum solid solution particles, adding water accounting for 3-6wt% of the total weight of the original added materials, stirring for 0.5-2 minutes, then adding fine powder, micro powder and a water reducer in the original added materials, and uniformly stirring;
and thirdly, pouring and vibrating the uniformly stirred mixture to form the cement-free high-chromium casting body.
The chemical components of the cement-free high-chromium castable are 65-90wt% of Cr 2O3, 2-10wt% of Al 2O3, 0.5-6wt% of MgO and 2-5wt% of ZrO 2, and the main crystal phase is chromium-aluminum solid solution, and the secondary crystal phase is magnesium-chromium-aluminum composite spinel and baddeleyite.
The invention innovatively uses no traditional aluminate cement as a binder to prepare the high-chromium castable, the initial strength of the anhydrous high-chromium castable is mainly that magnesium oxide is hydrated to generate brucite and M-S-H combined gel phase, the main products of the M-S-H phase are talcum and serpentine, magnesium oxide generated after the brucite is dehydrated by high-temperature sintering is reacted with chromium oxide and aluminum oxide to generate magnesia-chromite composite spinel, and the thermal expansion coefficients of spinel and chromite-alumina solid solution are different, so that the thermal shock performance of the anhydrous high-chromium castable is improved.
When the high-chromium castable takes the chromium oxide frit as the original material, aluminum oxide and chromium oxide infinitely form a chromium-aluminum solid solution in situ under a high-temperature use environment, zirconium oxide and magnesium-chromium-aluminum composite spinel are embedded between the chromium-aluminum solid solutions, and the high-chromium castable has compact structure and high strength, and the toughness and strength of the material are greatly improved by utilizing a phase change mechanism of the high-temperature castable;
When the high-temperature prefabricated chromium-aluminum solid solution particles are used as an original material, cr 2O3 is added into a corundum material, and along with the temperature rise, al 2O3 and Cr 2O3 gradually form a solid solution, a bonding phase is a chromium-aluminum solid solution phase, the chromium-aluminum solid solution particles are prepared at a high temperature, the content of the chromium-aluminum solid solution in the chromium-aluminum solid solution particles is more than or equal to 95wt%, and the content of Cr 2O3 in the chromium-aluminum solid solution is more than or equal to 85wt%. The chromium-aluminum solid solution still keeps the bonding strength in a high-temperature use environment, and the zirconia and the magnesium-chromium-aluminum composite spinel are embedded between the chromium-aluminum solid solutions, so that the high-temperature mechanical property of the castable is enhanced.
The compactness of the castable matrix can be improved and the porosity can be reduced by adjusting the granularity grading of the chromium oxide frit or chromium aluminum solid solution particles.
The invention has the advantages that the traditional aluminate cement is not used as a binding agent, and the prepared cement-free high-chromium castable reduces the porosity and improves the volume density, the compressive strength and the flexural strength. Magnesium oxide generated after brucite is decomposed under a high-temperature use environment reacts with chromium oxide and aluminum oxide to generate magnesium-chromium-aluminum composite spinel, the thermal shock performance of the high-chromium castable can be obviously improved due to the difference of thermal expansion coefficients of spinel and chromium-aluminum solid solution, and the slag erosion resistance of the material is excellent due to the fact that CaO is not contained in the binding agent and the influence of CaO on the slag erosion resistance of the material is reduced.
Drawings
FIG. 1 is an XRD pattern of a cement-free high chromium casting material of the present invention incubated at 110℃for 24 hours;
FIG. 2 is an XRD pattern of the cement-free high chromium castable of the present invention incubated for 3 hours at 1600 ℃;
FIG. 3 is an SEM micrograph of a cement-free high chromium castable of the present invention incubated for 3 hours at 1600 ℃.
In the figure, AC is chromium aluminum solid solution, MAC is magnesium chromium aluminum spinel, and ZrO 2 is baddeleyite.
Detailed Description
The embodiments of the present invention have been described in particular detail and are not thereby to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to these examples.
Example 1
The castable comprises 67 parts of chromium oxide frit particles, 13 parts of chromium oxide fine powder, 10 parts of alumina micropowder, 3 parts of zirconia micropowder, 3 parts of magnesia fine powder, 1 part of active silica micropowder and 0.15 part of PC-80 type polycarboxylate water reducer. The grain size grading of the chromium oxide frit body particles is that the grain size grading accounts for 30wt% in 5-3mm, 40 wt% in 3-1mm and 30wt% in 1-0.1 mm.
The preparation method of the cement-free high-chromium castable comprises the following steps:
Firstly, weighing and proportioning according to the original addition materials and parts by weight of the anhydrous high-chromium castable;
step two, firstly uniformly mixing the chromium oxide frit particles, adding water accounting for 3.5 weight percent of the total weight of the original added materials, stirring for 1.5-2 minutes, then adding fine powder, micro powder and a water reducer in the original added materials, and uniformly stirring;
and thirdly, pouring and vibrating the uniformly stirred mixture to form the cement-free combined high-chromium casting body.
The detection value of the prepared cement-free high-chromium castable is 10.6% of apparent porosity after being dried at 110 ℃, 4.03g/cm 3 in volume density, 50MPa in compressive strength, 10MPa in flexural strength, 19.2% of apparent porosity after being heated for 3 hours at 1600 ℃, 3.92g/cm 3 in volume density, 140MPa in compressive strength, 14MPa in flexural strength and 11 times in thermal shock stability.
Example 2
The original addition material comprises 65 parts of chromium oxide frit particles, 16 parts of chromium oxide fine powder, 10 parts of alumina micro powder, 3 parts of zirconia micro powder, 2 parts of magnesia fine powder, 2 parts of active silica micro powder and 0.15 part of sodium hexametaphosphate+SM composite water reducer. The grain size grading of the chromium oxide frit body particles is that the grain size grading accounts for 35wt% of 5-3mm, 45 wt% of 3-1mm and 20wt% of 1-0.1 mm.
The preparation method of the cement-free high-chromium castable comprises the following steps:
Firstly, weighing and proportioning according to the original addition materials of the cement-free combined high-chromium castable and the weight parts;
step two, firstly uniformly mixing the chromium oxide frit particles, adding water accounting for 3wt% of the total weight of the original added material, stirring for 0.5-1.5 minutes, then adding fine powder, micro powder and a water reducer in the original added material, and uniformly stirring;
and thirdly, pouring and vibrating the uniformly stirred mixture to form the cement-free high-chromium casting body.
The detection value of the prepared cement-free high-chromium castable is that the apparent porosity after being dried at 110 ℃, the volume density is 4.0g/cm 3, the compressive strength is 55MPa, the flexural strength is 11MPa, the apparent porosity after being heat-preserved for 3 hours at 1600 ℃ is 19.5%, the volume density is 3.93g/cm 3, the compressive strength is 145MPa, the flexural strength is 14.5MPa, and the thermal shock stability is 12 times.
Example 3
The original addition material comprises 70 parts of chromium oxide frit particles, 13 parts of chromium oxide fine powder, 8 parts of aluminA micro powder, 2 parts of zirconiA micro powder, 3 parts of magnesiA fine powder, 2 parts of active silicA micro powder and 0.1 part of PC-A type polycarboxylate water reducer. The grain size grading of the chromium oxide frit body particles is that the 5-3mm accounts for 40wt%, the 3-1mm accounts for 35%, and the 1-0.1mm accounts for 25wt%.
The preparation method of the cement-free high-chromium castable comprises the following steps:
Firstly, weighing and proportioning according to the original addition materials and parts by weight of the anhydrous high-chromium castable;
Step two, uniformly mixing the chromium oxide frit particles, adding water accounting for 4.5 weight percent of the total weight of the original added materials, stirring for 1-2 minutes, adding fine powder, micro powder and a water reducer in the original added materials, and uniformly stirring;
and thirdly, pouring and vibrating the uniformly stirred mixture to form the cement-free high-chromium casting body.
The detection value of the prepared cement-free high-chromium castable is that the apparent porosity after being dried at 110 ℃, the volume density is 4.0g/cm 3, the compressive strength is 56MPa, the flexural strength is 11MPa, the apparent porosity after being heat-preserved for 3 hours at 1600 ℃ is 19.6%, the volume density is 3.93g/cm 3, the compressive strength is 135MPa, the flexural strength is 13.5MPa, and the thermal shock stability reaches 10 times.
Example 4
The original addition material comprises 67 parts of chromium aluminum solid solution particles, 15 parts of chromium oxide fine powder, 10 parts of aluminA micropowder, 3 parts of zirconiA micropowder, 1 part of magnesium oxide fine powder, 2 parts of active silicA micropowder and 0.15 part of PC-A type polycarboxylate water reducer. The grain size grading of the chromium-aluminum solid solution particles is that the grain size grading accounts for 25wt% of 5-3mm, 40wt% of 3-1mm and 35wt% of 1-0.1 mm.
The preparation method of the cement-free high-chromium castable comprises the following steps:
Firstly, weighing and proportioning according to the original addition materials and parts by weight of the anhydrous high-chromium castable;
Step two, firstly uniformly mixing the chromium oxide frit particles, adding water accounting for 6 weight percent of the total weight of the original added materials, stirring for 1.5-2 minutes, then adding fine powder, micro powder and a water reducer in the original added materials, and uniformly stirring;
and thirdly, pouring and vibrating the uniformly stirred mixture to form the cement-free high-chromium casting body.
The detection value of the prepared cement-free high-chromium castable is that the apparent porosity after being dried at 110 ℃, the volume density is 4.05g/cm 3, the compressive strength is 60MPa, the flexural strength is 12MPa, the apparent porosity after being heat-preserved for 3 hours at 1600 ℃ is 19.8%, the volume density is 3.95g/cm 3, the compressive strength is 150MPa, the flexural strength is 15MPa, and the thermal shock stability reaches 12 times.
The composition of the cement-free high-chromium castable combined phase is affected by the magnesium/silicon ratio, when the ratio is large, brucite is more (see figure 1), magnesium oxide is generated after the brucite is dehydrated at high temperature, and the magnesium-chromium-aluminum composite spinel is generated by the reaction of the chromium oxide and the aluminum oxide in the castable (see figures 2 and 3), and the thermal shock performance of the material is improved due to the fact that the thermal expansion coefficients of the spinel and the chromium-aluminum solid solution in the castable are different. The high-chromium castable does not use the traditional aluminate cement as a binding agent, so the castable hardly contains CaO, and the influence of CaO on the slag erosion resistance of the material can be correspondingly reduced in the use process of the castable.
Claims (10)
1. The cement-free high-chromium castable is characterized by comprising, by weight, 60-70 parts of chromium oxide frit or chromium-aluminum solid solution particles, 6-20 parts of chromium oxide fine powder, 2-10 parts of aluminum oxide micro powder, 2-5 parts of zirconium oxide micro powder, 0.5-6 parts of magnesium oxide fine powder, 0.5-3 parts of active silicon oxide micro powder and 0.1-0.15 part of a water reducer.
2. The non-cement high-chromium castable according to claim 1, wherein the chromium oxide frit particles contain more than or equal to 99wt% of Cr 2O3, the chromium aluminum solid solution particles contain more than or equal to 95wt% of Cr 2O3, and the chromium aluminum solid solution particles contain more than or equal to 85wt%, and the grain size grading of the particles is that the grain size grading accounts for 25-40wt% of 5-3mm, the grain size grading accounts for 25-45wt% of 3-1mm, and the grain size grading accounts for 20-35wt% of 1-0.1 mm.
3. The cement-free high-chromium castable according to claim 1, wherein the chromium oxide fine powder contains Cr 2O3 with a content of more than or equal to 99wt% and has a granularity of less than or equal to 88 μm.
4. The high chromium-free castable without cement according to claim 1, wherein the content of Al 2O3 in the alumina fine powder is more than or equal to 99wt% and the granularity is less than or equal to 5um.
5. The cement-free high-chromium castable according to claim 1, wherein the content of ZrO 2 in the zirconia fine powder is more than or equal to 99wt% and the granularity is less than or equal to 5 um.
6. The high chromium-free castable without cement according to claim 1, wherein the MgO content in the magnesium oxide fine powder is more than or equal to 97wt% and the granularity is less than or equal to 44 um.
7. The cement-free high-chromium castable according to claim 1, wherein the SiO 2 content in the fine powder of the silicon oxide is more than or equal to 94wt% and the granularity is less than or equal to 5um.
8. The cement-free high-chromium castable is characterized in that the water reducer is one of PC-80, PC-A and sodium hexametaphosphate+SM water reducer.
9. The cement-free high-chromium castable is characterized by comprising the chemical components of 65-90wt% of Cr 2O3, 2-10wt% of Al 2O3, 0.5-6wt% of MgO and 2-5wt% of ZrO 2, wherein a main crystal phase is chromium-aluminum solid solution, and a secondary crystal phase is magnesium-chromium-aluminum composite spinel and baddeleyite.
10. The method for preparing the cement-free high-chromium castable according to claim 1, comprising the steps of:
Firstly, weighing and proportioning according to the original addition materials and parts by weight of the anhydrous high-chromium castable;
step two, firstly uniformly mixing the chromium oxide frit or chromium aluminum solid solution particles, adding water accounting for 3-6wt% of the total weight of the original added materials, stirring for 0.5-2 minutes, then adding fine powder, micro powder and a water reducer in the original added materials, and uniformly stirring;
and thirdly, pouring and vibrating the uniformly stirred mixture to form the cement-free high-chromium casting body.
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