CN106145964A - The dry type ramming material underwrited lining work for large ladle furnace - Google Patents
The dry type ramming material underwrited lining work for large ladle furnace Download PDFInfo
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- CN106145964A CN106145964A CN201510125543.0A CN201510125543A CN106145964A CN 106145964 A CN106145964 A CN 106145964A CN 201510125543 A CN201510125543 A CN 201510125543A CN 106145964 A CN106145964 A CN 106145964A
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- lining work
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Abstract
The invention discloses a kind of dry type ramming material underwrited lining work for large ladle furnace, this ramming mass i.e. includes following components, white fused alumina or plate diamond spar 60～80wt%, Alpha-alumina micropowder or corundum dust-removing powder 5～15wt%, magnesia powder 5～15wt%, aluminum-spinel fine powder 5～20wt%, sintering aid 0.2～1.5wt%.This ramming mass overcome existing resistance to material in use structural stress cannot self release digestion, produce structure spalling and cause the defect underwriting lining work service life reduction, reducing castable needs the energy resource consumption of long-time baking, it is to avoid the waste of resistance to material.
Description
Technical field
The present invention relates to a kind of dry type ramming material underwrited lining work for large ladle furnace.
Background technology
Ladle i.e. steel ladle, referring generally to unit weight more than the ladle of 120 tons of molten steel is large ladle furnace, is mainly used in steel mill, Foundry Works and accepts molten steel before converter or electric furnace, carries out pouring practice, and it is mainly responsible for carrying molten steel and carries out the dual role of external refining.Steel-smelting technology development, smelting temperature improves and continuous casting ratio increases, and molten steel is extended residence time in ladle, and ladle liner is required increasingly harsher by especially external refining LF, RH technique.The working lining of resistance to material structure at the bottom of large ladle furnace bag is complicated, bag end impact zone prefabricated section, air brick and the setting of pocket block, constrains the change underwriting lining work resistance to material structure, makes the Temperature Distribution underwrited lining work and stress distribution complicate.Strictly restricted in plane by ladle shell owing to the resistance to material of bottom of steel ladle working lining is in, therefore, the use damage of the resistance to material of bottom of steel ladle, erosion is washed away except high-temperature molten steel and slag, there is also peeling, ftracture and ooze the damage that steel causes, the bag resistance to material in the end produces and peels off, ftractures and ooze the reason of steel, be use in physical-chemical reaction produces under violent variations in temperature and the high temperature of resistance to material bulk effect.For large ladle furnace, the accumulative effect of the high temperature of resistance to material lower volume effect makes the resistance to material of bottom of steel ladle more be easily generated peeling, ftractures and ooze steel and damage.
It is said that in general, the resistance to material of bottom of steel ladle should have rational hot expansion rate, it is to avoid the generation of cracking, prevent from oozing steel；There is higher anti-slag and scour resistance, make to underwrite lining work there is the high life.The resistance to material of bottom of steel ladle working lining mainly has High-Alumina, magnalium carbonaceous, alabaster-SiC matter and high-purity aluminate matter or magnalium matter, and the construction of material is generally castable moulding by casting, or molding built by laying bricks or stones by prefabricated component (brick).Recent domestic many steel mills are the stabilisation realizing ladle service life, reduce refractory consumption rate, and at large ladle furnace, especially mild steel, ultra-low-carbon steel and clean steel steel grade smelting bottom of steel ladle is commonly used corundum-spinel castable or prefabricated section.
Use castable to prepare bottom of steel ladle, typically use aluminous cement, ρ-Al2O3As bonding agent, also refractory material at the bottom of the open a kind of large ladle furnace bag of patent ZL200410017481.3 is had to use magnesia bonding agent, these refractory materials are required for adding 4～7wt% water, after castable moulding by casting, need at room temperature to carry out the maintenance of more than 12 hours time, it is beneficial to bonding agent and produces bond strength with water generation hydration reaction, before ladle uses, these moisture added need to get rid of completely, so ladle to experience from low temperature to high-temperature baking, and the bag end, is as the lowermost region of ladle, its thickness is greater than the thickness of containment wall working lining, so the baking at the bag end becomes the restricted link of ladle baking, general ladle (more than 800 DEG C) from room temperature to high temperature needs to experience 40 hours or longer time, ladle needs to spend substantial amounts of fuel in baking process；Prefabricated component and the general production scene of brick are toasted, baking requirement castable to be less than in use, but there is brickwork joint, the overall performance of tympaning is less than castable, and the bag end, is when again building by laying bricks or stones, residual brick can not carry out peeling set as castable and water, it is necessary to all change, and causes a large amount of wastes of material.The most either castable or prefabricated component the most all define a fine and close entirety, when there being structural stress to produce, material self cannot digest stress, produce stress accumulation the increase along with stress accumulation, when cumulative stress is more than self bond strength of material, underwrite lining work recurring structure to peel off, reduce the service life of material.At present, when bottom of steel ladle working lining is corundum-spinel material, structural stress has been above the corrosional impact of ladle slag ferrum to the impact of material lifetime.
Summary of the invention
The technical problem to be solved is to provide a kind of dry type ramming material underwrited lining work for large ladle furnace, this ramming mass overcomes existing resistance to material in use structural stress self cannot discharge digestion, generation structure spalling causes the defect underwriting lining work service life reduction, reduce castable and need the energy resource consumption of long-time baking, it is to avoid the waste of resistance to material.
For solving above-mentioned technical problem, the dry type ramming material that the present invention underwrites lining work for large ladle furnace includes following components, white fused alumina or plate diamond spar 60～80 wt%, Alpha-alumina micropowder or corundum dust-removing powder 5～15 wt%, magnesia powder 5～15 wt%, aluminum-spinel fine powder 5～20 wt%, sintering aid 0.2～1.5 wt%.
Further, described white fused alumina or plate diamond spar include the white fused alumina of particle diameter 5～3mm or plate diamond spar 5～10 wt%, the white fused alumina of particle diameter 3～1mm or plate diamond spar 30～40 wt%, the white fused alumina of particle diameter 1～0.154mm or plate diamond spar 20～35 wt% and the white fused alumina of particle diameter≤0.154mm or plate diamond spar 5～15wt%.
Further, described Alpha-alumina micropowder or particle diameter≤2 μm of corundum dust-removing powder.
Further, described magnesia powder is 97 high-purity grades, and particle diameter≤63 μm.
Further, described aluminum-spinel fine powder is high-purity sintered aluminium magnesia spinel fine powder, and wherein alumina content is in 75 ~ 85 wt%, particle diameter≤63 μm of aluminum-spinel fine powder.
Further, described sintering aid is boric anhydride.
The dry type ramming material underwrited lining work for large ladle furnace due to the present invention have employed technique scheme, this ramming mass i.e. includes following components, white fused alumina or plate diamond spar 60～80 wt%, Alpha-alumina micropowder or corundum dust-removing powder 5～15 wt%, magnesia powder 5～15 wt%, aluminum-spinel fine powder 5～20 wt%, sintering aid 0.2～1.5 wt%.This ramming mass overcome existing resistance to material in use structural stress cannot self release digestion, produce structure spalling and cause the defect underwriting lining work service life reduction, reducing castable needs the energy resource consumption of long-time baking, it is to avoid the waste of resistance to material.
Accompanying drawing explanation
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings:
Fig. 1 is the ramming mass of the embodiment of the present invention 1 crucible sectional view after anti-slag；
Fig. 2 is the ramming mass of the embodiment of the present invention 2 crucible sectional view after anti-slag；
Fig. 3 is the ramming mass of the embodiment of the present invention 3 crucible sectional view after anti-slag；
Fig. 4 is the ramming mass of the embodiment of the present invention 4 crucible sectional view after anti-slag；
Fig. 5 is the ramming mass of the embodiment of the present invention 5 crucible sectional view after anti-slag.
Detailed description of the invention
The dry type ramming material that the present invention underwrites lining work for large ladle furnace includes following components, white fused alumina or plate diamond spar 60～80 wt%, Alpha-alumina micropowder or corundum dust-removing powder 5～15 wt%, magnesia powder 5～15 wt%, aluminum-spinel fine powder 5～20 wt%, sintering aid 0.2～1.5 wt%.
Further, described white fused alumina or plate diamond spar include the white fused alumina of particle diameter 5～3mm or plate diamond spar 5～10 wt%, the white fused alumina of particle diameter 3～1mm or plate diamond spar 30～40 wt%, the white fused alumina of particle diameter 1～0.154mm or plate diamond spar 20～35 wt% and the white fused alumina of particle diameter≤0.154mm or plate diamond spar 5～15wt%.
Preferably, described Alpha-alumina micropowder or particle diameter≤2 μm of corundum dust-removing powder.
Preferably, described magnesia powder is 97 high-purity grades, and particle diameter≤63 μm.
Preferably, described aluminum-spinel fine powder is high-purity sintered aluminium magnesia spinel fine powder, and wherein alumina content is in 75 ~ 85 wt%, particle diameter≤63 μm of aluminum-spinel fine powder.
Preferably, described sintering aid is boric anhydride.
This ramming mass selects the aluminate material that used application performance is best to be at present major ingredient, utilizes boric anhydride for sintering aid, in use need not add any moisture or other bonding agent, and direct dry method ramming becomes to underwrite lining work use.Material does not introduce moisture when preparation and molding, decreases existing material and discharges moisture and need to toast the energy resource consumption caused for a long time；Sintering aid produces bond strength when ladle baking is more than 350 DEG C, sintering aid starts fusing and spreads to bag basal surface, the intensity promoting bag basal surface material raises, meet the use requirement of ladle, and inside is due to the factor of thermograde, it is still the loose structure of ramming process away from the position of work surface；Ladle is in use, the heat of molten steel is transferred to underwrite lining work material, so working lining material surface produces sintering, stop molten steel and the infiltration of slag, and working lining material internal is due to its loose structure, poor thermal conductivity, underwrite lining work and there is thermograde inside steel contacts face to working lining, it is fine and close fine and close again to loose structure to half that the most whole working lining is formed by extremely inside, contact molten steel face, therefore underwriting lining work and use the structural stress produced to absorb at working lining internal loose, structural stress eliminates；And along with working lining surfacing is gradually consumed, underwrite lining work thinning, but still be by contact molten steel face to inside be fine and close to partly densification again to loose structure, arrive its service life when underwriting lining work thickness less than 60mm or other reason of ladle, keep in repair or made new underwriting lining work to underwriting lining work.In maintenance or again make new when underwriting lining work, only need to be removed by one layer of the surface dense material with steel contacts, surplus material still can be reused.
Underwriting lining work of using that this ramming mass makes decreases existing to be got rid of moisture before use and needs the consumption of mass energy with underwriting lining work, and overcomes owing to structural stress can not be released the structure spalling that causes during use, and without containing CaO or SiO2Deng the interpolation of bonding agent, improve the purity underwriting lining work material, the erosion performance underwriting lining work the anti-molten steel of material and slag improves, and increases the most accordingly service life；Prepare new when underwriting lining work, it is only necessary to removing former working lining surface compact layer material and i.e. can add virgin material ramming process, half remaining compacted zone and unconsolidated formation material still can retain use.This ramming mass could be applicable to ultra-low-carbon steel and the requirement of general clean steel steel grade material resistance to ladle, it is also possible to the class reducing material is used in small-sized ladle, is particularly suited for north of china in winter and toasts the place being difficult to, improves all transfer efficients of ladle.
This ramming mass facilitates preparation to underwrite lining work, and with each material of this ramming mass as raw material, adds blender and is uniformly mixed, and carrying out dry type ramming process at bottom of steel ladle can use.
The proportioning raw materials of embodiment 1-5 ramming mass is as shown in table 1, and the performance of embodiment 1-5 ramming mass is as shown in table 2, and embodiment 1-5 ramming mass crucible sectional view after anti-slag is as shown in Figures 1 to 5.
Table 1 embodiment 1-5 proportioning raw materials
The performance of table 2 embodiment 1-5 material
Shown by table 2 and Fig. 1 to Fig. 5, originally underwrite lining work with dry type ramming material after 1600 DEG C of insulations are burnt till for 3 hours, material internal is formed without fine and close combination, combination degree from surface to internal material is fine and close to loose by densification to half, and internal loose structure can assimilate the material structural stress that surface produces when applied at elevated temperature；Material has good erosion-resisting characteristics, in use can resist the erosion of molten steel and slag.
Claims (6)
1. the dry type ramming material underwrited lining work for large ladle furnace, it is characterized in that: this ramming mass includes following components, white fused alumina or plate diamond spar 60～80 wt%, Alpha-alumina micropowder or corundum dust-removing powder 5～15 wt%, magnesia powder 5～15 wt%, aluminum-spinel fine powder 5～20 wt%, sintering aid 0.2～1.5 wt%.
The dry type ramming material underwrited lining work for large ladle furnace the most according to claim 1, it is characterised in that: described white fused alumina or plate diamond spar include white fused alumina or the plate diamond spar 5～10 of particle diameter 5～3mm
Wt%, the white fused alumina of particle diameter 3～1mm or plate diamond spar 30～40 wt%, the white fused alumina of particle diameter 1～0.154mm or plate diamond spar 20～35 wt% and the white fused alumina of particle diameter≤0.154mm or plate diamond spar 5～15wt%.
The dry type ramming material underwrited lining work for large ladle furnace the most according to claim 1, it is characterised in that: described Alpha-alumina micropowder or particle diameter≤2 μm of corundum dust-removing powder.
The dry type ramming material underwrited lining work for large ladle furnace the most according to claim 1, it is characterised in that: described magnesia powder is 97 high-purity grades, and particle diameter≤63 μm.
The dry type ramming material underwrited lining work for large ladle furnace the most according to claim 1, it is characterized in that: described aluminum-spinel fine powder is high-purity sintered aluminium magnesia spinel fine powder, wherein alumina content is in 75 ~ 85 wt%, particle diameter≤63 μm of aluminum-spinel fine powder.
The dry type ramming material underwrited lining work for large ladle furnace the most according to claim 1, it is characterised in that: described sintering aid is boric anhydride.
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| CN201510125543.0A CN106145964B (en) | 2015-03-23 | 2015-03-23 | Dry ramming material for large ladle bottom working lining |
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| CN201510125543.0A CN106145964B (en) | 2015-03-23 | 2015-03-23 | Dry ramming material for large ladle bottom working lining |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108298947A (en) * | 2018-01-10 | 2018-07-20 | 淮阴师范学院 | A kind of purposes of attapulgite ceramic film support, preparation method and boracic sintering aid |
| CN110304909A (en) * | 2019-07-21 | 2019-10-08 | 山东耐火材料集团有限公司 | Hot investment casting intermediate frequency furnace dry materials and preparation method thereof |
| CN110776312A (en) * | 2019-09-30 | 2020-02-11 | 山东耀华特耐科技有限公司 | Cement-free castable |
| CN111470855A (en) * | 2020-04-21 | 2020-07-31 | 北京瑞普同创科技发展有限公司 | Tundish impact plate resistant to molten steel scouring and preparation method and construction method thereof |
| CN112794702A (en) * | 2020-12-30 | 2021-05-14 | 上海利尔耐火材料有限公司 | Steel ladle wall castable containing white corundum dust removal powder and preparation method thereof |
| CN113336535A (en) * | 2021-08-04 | 2021-09-03 | 北京利尔高温材料股份有限公司 | Novel high-thermal-shock-resistance low-carbon aluminum-magnesium spinel carbon brick and preparation method thereof |
| CN115124356A (en) * | 2021-03-24 | 2022-09-30 | 宝山钢铁股份有限公司 | Furnace bottom dry-type ramming material for magnesia-alumina electric furnace |
| CN115925398A (en) * | 2023-01-19 | 2023-04-07 | 湖北安耐捷新材料科技有限公司 | Aluminum-magnesium dry-type ramming mass for medium-frequency induction furnace and preparation method thereof |
| CN116715531A (en) * | 2023-06-28 | 2023-09-08 | 山东泰润冶金技术有限公司 | Neutral dry ramming mass for cast steel intermediate frequency furnace |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108298947A (en) * | 2018-01-10 | 2018-07-20 | 淮阴师范学院 | A kind of purposes of attapulgite ceramic film support, preparation method and boracic sintering aid |
| CN108298947B (en) * | 2018-01-10 | 2020-10-30 | 淮阴师范学院 | Attapulgite ceramic membrane support, preparation method and application of boron-containing sintering aid |
| CN110304909A (en) * | 2019-07-21 | 2019-10-08 | 山东耐火材料集团有限公司 | Hot investment casting intermediate frequency furnace dry materials and preparation method thereof |
| CN110776312A (en) * | 2019-09-30 | 2020-02-11 | 山东耀华特耐科技有限公司 | Cement-free castable |
| CN111470855A (en) * | 2020-04-21 | 2020-07-31 | 北京瑞普同创科技发展有限公司 | Tundish impact plate resistant to molten steel scouring and preparation method and construction method thereof |
| CN111470855B (en) * | 2020-04-21 | 2022-12-13 | 北京瑞普同创科技发展有限公司 | Tundish impact plate resistant to molten steel scouring and preparation method and construction method thereof |
| CN112794702A (en) * | 2020-12-30 | 2021-05-14 | 上海利尔耐火材料有限公司 | Steel ladle wall castable containing white corundum dust removal powder and preparation method thereof |
| CN115124356A (en) * | 2021-03-24 | 2022-09-30 | 宝山钢铁股份有限公司 | Furnace bottom dry-type ramming material for magnesia-alumina electric furnace |
| CN113336535A (en) * | 2021-08-04 | 2021-09-03 | 北京利尔高温材料股份有限公司 | Novel high-thermal-shock-resistance low-carbon aluminum-magnesium spinel carbon brick and preparation method thereof |
| CN115925398A (en) * | 2023-01-19 | 2023-04-07 | 湖北安耐捷新材料科技有限公司 | Aluminum-magnesium dry-type ramming mass for medium-frequency induction furnace and preparation method thereof |
| CN116715531A (en) * | 2023-06-28 | 2023-09-08 | 山东泰润冶金技术有限公司 | Neutral dry ramming mass for cast steel intermediate frequency furnace |
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