CN104418597A - Castable used for RH refining furnace lining and construction method thereof - Google Patents
Castable used for RH refining furnace lining and construction method thereof Download PDFInfo
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- CN104418597A CN104418597A CN201310365321.7A CN201310365321A CN104418597A CN 104418597 A CN104418597 A CN 104418597A CN 201310365321 A CN201310365321 A CN 201310365321A CN 104418597 A CN104418597 A CN 104418597A
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Abstract
The invention discloses a castable used for an RH refining furnace lining and a construction method thereof. The castable is prepared with electric-smelting compact corundum, electric-smelting white corundum and electric-smelting spinel as main raw materials and with activated aluminum oxide micro-powder, pure calcium aluminate cement and electric-smelting calcium titanate as basic materials with addition of a proper amount of a high-efficient composite dispersing agent, wherein the electric-smelting compact corundum and the electric-smelting white corundum are in different grain size distribution. The construction method includes following steps: mixing a powdery material and an aggregate of the castable in a mixer to prepare two pre-mixed materials and then dry-mixing the two pre-mixed materials in a forced stirrer uniformly, wherein a proper amount of water at normal temperature is added for uniformly mixing the materials while the pre-mixed materials are stirred to obtain the castable for moulding. The castable is good in workability, is high in strength, is strong in volume stability and is excellent in thermal shock resistance and slag corrosion resistance. The refining furnace lining manufactured through the construction method can be used for completely replacing a conventional magnesium-chromium fire resistant material, is free of discharge of heavy metals, can avoid environmental pollution and can ensure quality of a refined steel material.
Description
Technical field
The present invention relates to a kind of mould material for RH refining furnace furnace lining and constructional method thereof.
Background technology
Along with the progress of the reach of science and engineering, more and more higher to the specification of quality of steel, iron and steel enterprise generally have employed furnace outer refining process.This technique can improve steelmaking equipment throughput, improve steel product quality, reduce energy consumption, reduce resistance to material, the energy and iron alloy consumption, become indispensable important step in modern process for making, be also the direction of ferrous metallurgy development simultaneously.One of indispensable visual plant of high quality steel produced in external refining process by RH refining furnace.Because the refining condition of RH refining furnace is very harsh, therefore traditional magnesian-chrome efractoy becomes the critical material of RH refining furnace furnace lining with its good erosion-resisting characteristics.
Along with continually strengthening of RH refining condition, it is also proposed new higher requirement to refractory materials, traditional magnesian-chrome efractoy also no longer can meet the requirement of smelting technology completely.What can not be ignored is the sexavalent chrome that magnesian-chrome efractoy in use can produce severe toxicity simultaneously; generation heavy metals emission pollutes; have a strong impact on environment protection; therefore how to use Chrome free refractories products substitution tradition magnesian-chrome efractoy be must faced by problem, refractory materials Trend of Chrome-free will become the direction paid close attention to.
In recent years, propose to adopt magnesia carbon brick for RH refining furnace, be intended to the pollution replacing chromium in magnesia chrome brick, a large amount of obnoxious flavour but magnesia carbon brick is emerged in thermal treatment and onsite application from body of heater gap, serious pollution is caused equally to human body and environment, and because being also disadvantageous containing C element to Clean Steel Smelting in magnesia carbon brick.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of mould material for RH refining furnace furnace lining and constructional method thereof, this mould material has good workability, intensity is high, volume stability is strong, thermal shock resistance and anti-scour property excellent, the furnace lining that this constructional method obtains can replace traditional magnesian-chrome efractoy completely, heavy metal free disposal of pollutants, avoid environmental pollution, ensure that the quality of refining steel.
For solving the problems of the technologies described above, the present invention is used for large grain electric smelting compact alumina, the granule electric smelting compact alumina of 10 ~ 20wt%, the large grain fused white corundum of 10 ~ 20wt%, the granule fused white corundum of 10 ~ 20wt%, the electric smelting spinel of 8 ~ 15wt%, the electric-melten calcium titanate of 1 ~ 8wt%, the Reactive alumina of 3 ~ 10wt%, the fine aluminium acid salt cement of 2 ~ 5wt% that the mould material of RH refining furnace furnace lining comprises 10 ~ 15wt%, the high efficiency composition dispersion agent of additional mould material 0 ~ 0.9wt%.
Further, the particle diameter of above-mentioned large grain electric smelting compact alumina is 8 ~ 5 millimeters, and the particle diameter of described granule electric smelting compact alumina is 5 ~ 3 millimeters.
Further, the particle diameter of above-mentioned large grain fused white corundum is 3 ~ 1 millimeters, and the particle diameter of described granule fused white corundum is 1 ~ 0 millimeter.
Further, the particle diameter of above-mentioned electric smelting spinel is 1 ~ 0.088 millimeter.
Further, particle diameter≤0.074 millimeter of above-mentioned electric-melten calcium titanate.
Further, particle diameter≤5 μ of above-mentioned Reactive alumina.
The constructional method of described mould material is by granule fused white corundum, Reactive alumina, fine aluminium acid salt cement, electric-melten calcium titanate and high efficiency composition dispersion agent stir in proportion and make the first Preblend and splendid attire in mixer, by large grain electric smelting compact alumina, granule electric smelting compact alumina, large grain fused white corundum and electric smelting spinel stir in proportion and make the second Preblend and splendid attire in mixer, first Preblend and the second Preblend are added in forced stirrer and carries out being dry mixed evenly, during casting and constructing, the shaping use of mould material can be carried out after the normal-temperature water adding 4.5 ~ 6.5wt% while stirring mixes.
Further, above-mentioned mould material adopts vibratory compaction or flows automatically shaping when constructing.
The mould material of RH refining furnace furnace lining is used for and constructional method have employed technique scheme due to the present invention, namely this mould material adopts electric smelting compact alumina, fused white corundum and electric smelting spinel to be main raw material, electric smelting compact alumina and white fused alumina adopt different grain size distributions, with Reactive alumina, pure calcium aluminate cement and electric-melten calcium titanate for matrix forms, and it is formulated to add appropriate high efficiency composition dispersion agent.Powder in mould material and aggregate are first made two kinds of Preblendes by this constructional method in proportion in mixer, then two kinds of Preblendes are added in forced stirrer and carry out being dry mixed evenly, after the normal-temperature water adding 4.5 ~ 6.5wt% while stirring mixes, mould material shaping use can be carried out during construction.This mould material has good workability, intensity is high, volume stability is strong, thermal shock resistance and anti-scour property excellent, the furnace lining that this constructional method obtains can replace traditional magnesian-chrome efractoy completely, heavy metal free disposal of pollutants, avoids environmental pollution, ensure that the quality of refining steel.
Embodiment
The present invention is used for large grain electric smelting compact alumina, the granule electric smelting compact alumina of 10 ~ 20wt%, the large grain fused white corundum of 10 ~ 20wt%, the granule fused white corundum of 10 ~ 20wt%, the electric smelting spinel of 8 ~ 15wt%, the electric-melten calcium titanate of 1 ~ 8wt%, the Reactive alumina of 3 ~ 10wt%, the fine aluminium acid salt cement of 2 ~ 5wt% that the mould material of RH refining furnace furnace lining comprises 10 ~ 15wt%, the high efficiency composition dispersion agent of additional mould material 0 ~ 0.9wt%.
Further, the particle diameter of above-mentioned large grain electric smelting compact alumina is 8 ~ 5 millimeters, and the particle diameter of described granule electric smelting compact alumina is 5 ~ 3 millimeters.
Further, the particle diameter of above-mentioned large grain fused white corundum is 3 ~ 1 millimeters, and the particle diameter of described granule fused white corundum is 1 ~ 0 millimeter.
Further, the particle diameter of above-mentioned electric smelting spinel is 1 ~ 0.088 millimeter.
Further, particle diameter≤0.074 millimeter of above-mentioned electric-melten calcium titanate.
Further, particle diameter≤5 μ of above-mentioned Reactive alumina.
The constructional method of described mould material is by granule fused white corundum, Reactive alumina, fine aluminium acid salt cement, electric-melten calcium titanate and high efficiency composition dispersion agent stir in proportion and make the first Preblend and splendid attire in mixer, by large grain electric smelting compact alumina, granule electric smelting compact alumina, large grain fused white corundum and electric smelting spinel stir in proportion and make the second Preblend and splendid attire in mixer, first Preblend and the second Preblend are added in forced stirrer and carries out being dry mixed evenly, during casting and constructing, the shaping use of mould material can be carried out after the normal-temperature water adding 4.5 ~ 6.5wt% while stirring mixes.
Further, above-mentioned mould material adopts vibratory compaction or flows automatically shaping when constructing.
It is Al that this mould material forms main component
2o
3-MgO-CaO-TiO
2mould material, itself and traditional magnesia chrome brick compare possessed advantage with magnesia carbon brick be not containing the harmful element such as chromium, carbon, sulphur, to human body and environmental nonpollution; Adopt integrated poured form of construction work, labor strength is little, operating efficiency is high; Construction process takes vibration or shaping mode of flowing automatically, and without the need to through thermal treatment, can directly use, and reaches energy-saving and emission-reduction, reduces the object of energy consumption; Adopt scientific and reasonable grain composition mode in mould material simultaneously, optimize substrate combination, add appropriate high efficiency composition dispersion agent, effectively improve the workability of mould material; The electric-melten calcium titanate uniform microstructure adopted, has good resistance to chemical attack and alkali-resistivity slag corrosion, improves hot strength and the resistance to slag corrosion of RH refining furnace furnace lining; In this mould material, high efficiency composition dispersion agent can adopt FDN-1 dispersion agent.
Lower list 1 is the Performance comparision of two kinds of mould material of the present invention and traditional magnesia chrome brick and magnesia carbon brick, and table 2 is that this mould material compares with the principal character of traditional magnesia chrome brick and magnesia carbon brick.
Table 1
Table 2
| Principal character | RH magnesia chrome brick | RH magnesia carbon brick | Mould material |
| Production and construction efficiency | Low | Low | Very high |
| Energy problem | Waste | Waste | Energy-conservation |
| Harmful element | Chromium | Carbon | Environmental protection |
| Intensity | Generally | Generally | Very high |
| Strength retention after thermal shock | Generally | Poor | High |
| Slag resistance | Very well | Well | Very well |
Claims (8)
1. the mould material for RH refining furnace furnace lining, it is characterized in that: this mould material comprises large grain electric smelting compact alumina, the granule electric smelting compact alumina of 10 ~ 20wt%, the large grain fused white corundum of 10 ~ 20wt%, the granule fused white corundum of 10 ~ 20wt%, the electric smelting spinel of 8 ~ 15wt%, the electric-melten calcium titanate of 1 ~ 8wt%, the Reactive alumina of 3 ~ 10wt%, the fine aluminium acid salt cement of 2 ~ 5wt% of 10 ~ 15wt%, the high efficiency composition dispersion agent of additional mould material 0 ~ 0.9wt%.
2. the mould material for RH refining furnace furnace lining according to claim 1, is characterized in that: the particle diameter of described large grain electric smelting compact alumina is 8 ~ 5 millimeters, and the particle diameter of described granule electric smelting compact alumina is 5 ~ 3 millimeters.
3. the mould material for RH refining furnace furnace lining according to claim 1, is characterized in that: the particle diameter of described large grain fused white corundum is 3 ~ 1 millimeters, and the particle diameter of described granule fused white corundum is 1 ~ 0 millimeter.
4. the mould material for RH refining furnace furnace lining according to claim 1, is characterized in that: the particle diameter of described electric smelting spinel is 1 ~ 0.088 millimeter.
5. the mould material for RH refining furnace furnace lining according to claim 1, is characterized in that: particle diameter≤0.074 millimeter of described electric-melten calcium titanate.
6. the mould material for RH refining furnace furnace lining according to claim 1, is characterized in that: particle diameter≤5 μ of described Reactive alumina.
7. the constructional method of mould material described in an any one of claim 1 to 6, it is characterized in that: by granule fused white corundum, Reactive alumina, fine aluminium acid salt cement, electric-melten calcium titanate and high efficiency composition dispersion agent stir in proportion and make the first Preblend and splendid attire in mixer, by large grain electric smelting compact alumina, granule electric smelting compact alumina, large grain fused white corundum and electric smelting spinel stir in proportion and make the second Preblend and splendid attire in mixer, first Preblend and the second Preblend are added in forced stirrer and carries out being dry mixed evenly, during casting and constructing, add while stirring after 4.5 ~ 6.5wt% normal-temperature water mixes and can carry out the shaping use of mould material.
8. constructional method according to claim 7, is characterized in that: described mould material adopts vibratory compaction or flows automatically shaping when constructing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310365321.7A CN104418597A (en) | 2013-08-21 | 2013-08-21 | Castable used for RH refining furnace lining and construction method thereof |
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| CN201310365321.7A CN104418597A (en) | 2013-08-21 | 2013-08-21 | Castable used for RH refining furnace lining and construction method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106830958A (en) * | 2017-03-21 | 2017-06-13 | 北京兰海金诚耐火材料有限责任公司 | A kind of low aluminum heat conduction Alkali resistant castable refractory |
| CN109053167A (en) * | 2018-09-05 | 2018-12-21 | 北京东峰兴达耐火材料有限公司 | Vacuum boiler burner hearth gravity flow pouring material |
| CN116589289A (en) * | 2023-05-15 | 2023-08-15 | 浙江锦诚新材料股份有限公司 | Acid-resistant castable and preparation method thereof |
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| CN102603326A (en) * | 2012-03-21 | 2012-07-25 | 长兴云峰炉料有限公司 | Microcrystalline glass composite ceramic Al2O3-SiC-C-based castable |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106830958A (en) * | 2017-03-21 | 2017-06-13 | 北京兰海金诚耐火材料有限责任公司 | A kind of low aluminum heat conduction Alkali resistant castable refractory |
| CN106830958B (en) * | 2017-03-21 | 2020-04-17 | 北京兰海金诚耐火材料有限责任公司 | Low-aluminum low-heat-conduction alkali-resistant castable |
| CN109053167A (en) * | 2018-09-05 | 2018-12-21 | 北京东峰兴达耐火材料有限公司 | Vacuum boiler burner hearth gravity flow pouring material |
| CN109053167B (en) * | 2018-09-05 | 2019-06-25 | 北京东峰兴达耐火材料有限公司 | Vacuum boiler burner hearth gravity flow pouring material |
| CN116589289A (en) * | 2023-05-15 | 2023-08-15 | 浙江锦诚新材料股份有限公司 | Acid-resistant castable and preparation method thereof |
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Application publication date: 20150318 |