CN105000892A - Thermal gunning material for RH furnace lower portion groove working lining magnesium-aluminum spinel brick - Google Patents
Thermal gunning material for RH furnace lower portion groove working lining magnesium-aluminum spinel brick Download PDFInfo
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- CN105000892A CN105000892A CN201410149969.5A CN201410149969A CN105000892A CN 105000892 A CN105000892 A CN 105000892A CN 201410149969 A CN201410149969 A CN 201410149969A CN 105000892 A CN105000892 A CN 105000892A
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- working lining
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Abstract
The invention relates to a thermal gunning material for a RH furnace lower portion groove working lining magnesium-aluminum spinel brick. A purpose of the present invention is to solve the technical problems of high bounce rate, long repair work time and difficult low-silicon smelting during the hot-state repair of the RH furnace lower portion groove working lining magnesium-aluminum spinel brick in the prior art. The thermal gunning material comprises the following raw materials by weight: 35-45% of sintered magnesia, 25-35% of periclase, 13-24% of corundum, 6-8% of sodium nitrate, and 3-4% of Al203 micro-powder. According to the present invention, the thermal gunning material is mainly used for the hot-state repair of the RH furnace lower portion groove working lining magnesium-aluminum spinel brick, wherein the service life of the RH furnace lower portion groove working lining achieves more than 4 times the original service life after the repair, and compared with the bounce rate of the existing gunning material of 20%, the bounce rate of the gunning material of the present invention is reduced to less than or equal to 5% during the thermal repair.
Description
Technical field
The present invention relates to a kind of RH stove lower channel working lining refractory brick with vulcanizing Gunning refractory, particularly a kind of RH stove lower channel working lining Mg-Al spinel brick is with vulcanizing Gunning refractory.
Background technology
RH vacuum deaeration refining method is that Rule company (Ruhrstahl) belonging to Thyssen company (Tyssen) and extra large Lars company (Heraeus) have succeeded in developing vacuum molten steel circulation degassing method jointly, two companies by the name of its company by this molten steel refining method called after RH vacuum deaeration refining method, the method can make [O] in molten steel, [N] reduces further, for the smelting to molten steel composition cleanliness factor height steel grade.
RH stove tubular stinger working conditions mainly contains three aspects, one be to stand swiftly flowing air-flow and molten steel wash away erosion; Two is erosion and infiltrations of slag; Three is the thermal spalling that causes of batch production temperature fluctuation and structure spalling.Current resistance to material is once occur peeling off process of just rolling off the production line, safeguard, also be not exclusively used at present in prior art and repair RH refractory brick Gunning refractory, " a kind of environment-friendly aqueous long-life self-flowing repairing mix for converter and preparation method thereof " of China Patent Publication No. CN101792322A, its with electrosmelted magnesite clinker, magnesite clinker and fine silica powder for main raw material, compound use ferrosilicon powder, carborundum powder and metal fine powder etc. one or more as short burning agent, adopt citric acid etc. to be retardant, obtain through mix and blend; Although this repair material environmental protection, but it exists preparation cost high defect, and due to its evaporation that there is low molten thing or the steam at high temperature produced, make the working lining short texture after repairing, intensity very little, there is short problem in work-ing life, be not suitable for repairing RH refractory brick.
In prior art, Chinese patent CN 201310326395.X A patent name is, a kind of Gunning refractory repaired for RH refractory brick, its main component is, periclasite, magnesite clinker, pure calcium aluminate cement, silicon oxide ultrafine powder, Al
20
3micro mist, when this material is used for hot repairing work, there is rebound rate high, the effective rate of utilization of Gunning refractory is low, the defect that the repairing work time is long; Separately, containing silica ultrafine powder in this material component, after breakage appears in repair part, the resistance to material peeled off is molten is not less than the smelting of low-silicon steel as entered in molten steel, and separately this patent of invention concrete position that uses in RH stove is undeclared.
Summary of the invention
The object of this invention is to provide a kind of RH stove lower channel working lining Mg-Al spinel brick with vulcanizing Gunning refractory.Solve that existing Gunning refractory is high in the rebound rate for existing during RH stove lower channel working lining Mg-Al spinel brick hot patching, the repairing work time is long and is unfavorable for the technical problem of smelting low-silicon steel.
The technical solution used in the present invention is:
A kind of RH stove lower channel working lining Mg-Al spinel brick is with vulcanizing Gunning refractory, and the weight percent of its feed composition is: magnesite clinker 35% ~ 45%, periclasite 25% ~ 35%, corundum 13% ~ 24%, SODIUMNITRATE 6% ~ 8%, Al
20
3micro mist 3% ~ 4%.
Because RH refractory brick is alkaline matter, therefore, the main component of all resistance to materials based on alkaline matter, to prevent the reaction of alkaline matter and acidic substance.
This patent selects alkaline matter periclasite and magnesite clinker as repair material aggregate, and total composition accounts for 60% ~ 80%.Periclasite and magnesite clinker are all the oxide compounds of magnesium, and magnesite clinker forms through high-temperature calcination primarily of magnesite, water magnesium ore deposit or the magnesium hydroxide that extracts from seawater, and its MgO activity degree is high, and the price of magnesite clinker is relatively high; Periclasite mainly produces in marble, and being that rhombspar is at high temperature rotten is formed, and its fusing point is 2800 DEG C, and its price is relatively cheap.Because magnesian does not have plasticity-, if the too high levels of periclasite and magnesite clinker in repair material, then constructional difficulties; If content is too low, material property then changes, and effectively can not resist the erosion of lime.But only use magnesite clinker as ramming mass aggregate, then cost is higher; Through experiment, adopt periclasite and magnesite clinker mixture as ramming mass aggregate, at high temperature can sinter entirety into RH fireproof magnesia alumina spinel brick, the requirement of RH stove performance can be met; Can getting a desired effect simultaneously, cost is more reasonable again; For the ease of construction, repair material particle diameter≤5mm is advisable.
In order to strengthen the erosion of the resistance to molten steel after the repairing of this Gunning refractory, add corundum composition in the material, its content wants appropriate, too low, then do not have the resistance to material with certain scouring intensity of resistance to molten steel overall, too high, be then unfavorable for the anti-cracking property of repair material; Experiment shows, its Composition Control is 13% ~ 24%;
During hot repairing work, the surface temperature of RH stove lower channel working lining Mg-Al spinel brick is 300 DEG C ~ 500 DEG C; The fusing point of SODIUMNITRATE industrial reagent is 302.6 DEG C, the SODIUMNITRATE reducing the early stage fusing point of Gunning refractory is provided with in instant component, Gunning refractory fusing point can be reduced, reduce the rebound rate of Gunning refractory, but SODIUMNITRATE add-on can not be too much, in order to avoid fusing point is too low and reduce Gunning refractory cohesive strength, through overtesting, SODIUMNITRATE 6% ~ 8%.
The combination of Gunning refractory of the present invention adopts the mode of Coagulating binding, being realized, forming an entirety, the Al in instant component fast to make this Gunning refractory with former brick during the Coagulating binding of Gunning refractory by SODIUMNITRATE and ultra-fine alumina powder
20
3micro mist mainly and partially sinter magnesia powder reaction and generate magnesium-aluminium spinel, promotes that further repair material at high temperature forms entirety with Mg-Al spinel brick, due to Al
20
3micro mist has been katalysis, and its content should not be too high; Experiment shows, Al
20
3powder content is advisable 3% ~ 4%; Al
20
3be advisable in particle diameter≤2 micron of micro mist.
RH stove lower channel working lining Mg-Al spinel brick work-ing life is made to be original more than 4 times after Gunning refractory spray repair of the present invention, the rebound rate of rear Gunning refractory is used to be reduced to less than 5% by 20% of former technology, meet the service requirements of iron and steel enterprise to RH stove lower channel working lining, not siliceous in Gunning refractory component of the present invention, be conducive to the production of low-silicon steel.
The constructional method of this patent is:
In Gunning refractory, add a little water, so that spray repair is advisable, amount of water controls 2 ~ 3%, under the hot state of RH stove lower channel, by Gunning refractory spray repair to the resistance to material exfoliation of RH stove lower channel working lining magnesium-aluminium spinel, after resting 2 hours, and use of can reaching the standard grade.
The present invention has following positively effect compared to existing technology:
1, during hot patching, the rebound rate of Gunning refractory is reduced to less than 5% by 20% of former technology, shortens the repairing time, and after repairing, RH stove lower channel working lining magnesium-aluminium spinel work-ing life is original 4 times.
2. after repairing, RH stove lower channel working lining reaches more than 170 stoves work-ing life, meets the requirement that steel mill's normal production requirement is greater than more than 85 stoves work-ing life.
3, this Gunning refractory can guarantee the production of iron and steel enterprise's low-silicon steel.
Embodiment
A kind of RH stove lower channel working lining Mg-Al spinel brick is with vulcanizing Gunning refractory, and the weight percent of its feed composition is: magnesite clinker 35% ~ 45%, periclasite 25% ~ 35%, corundum 13% ~ 24%, SODIUMNITRATE 6% ~ 8%, Al
20
3micro mist 3% ~ 4%.
The compound method of product of the present invention is, first carry out brokenly pulverizing to periclasite and magnesite clinker, ultra-fine alumina powder, corundum, SODIUMNITRATE, as aggregate, are carried out weigh batching by the particle filtering out particle diameter≤5mm, in mixing pan, mix 15 ~ 20 minutes, reinstall finished bag.
The embodiment of the present invention sees the following form.
RH stove lower channel working lining Mg-Al spinel brick is with vulcanizing Gunning refractory embodiment table
With the present invention's 30 tons of Gunning refractories to after the lower channel lower channel refractory brick spray repair of RH stove, the rebound rate of Gunning refractory is only 2%, and do not have a stove low-silicon steel to cause it defective because the silicon of resistance to material overflows, because the lower channel lower channel refractory brick cracking of RH stove or cycle of coming off and producing maintenance are monthly reduced to about 1 time time for about 5 times from original, save maintenance cost; Existing spray repair method brings up to average 190 heats to mean life after the lower channel spray repair of RH stove from original average 70 heats.
Claims (5)
1. RH stove lower channel working lining Mg-Al spinel brick is with vulcanizing a Gunning refractory, and the weight percent of its feed composition is: magnesite clinker 35% ~ 45%, periclasite 25% ~ 35%, corundum 13% ~ 24%, SODIUMNITRATE 6% ~ 8%, Al
20
3micro mist 3% ~ 4%.
2. RH stove lower channel working lining Mg-Al spinel brick as claimed in claim 1 is with vulcanizing Gunning refractory, and the weight percent of its feed composition is: magnesite clinker 37%, periclasite 33%, corundum 19%, SODIUMNITRATE 7%, Al
20
3micro mist 4%.
3. RH stove lower channel working lining Mg-Al spinel brick as claimed in claim 1 is with vulcanizing Gunning refractory, and the weight percent of its feed composition is: magnesite clinker 43%, periclasite 27%, corundum 18%, SODIUMNITRATE 8%, Al
20
3micro mist 4%.
4. RH stove lower channel working lining Mg-Al spinel brick as claimed in claim 1 is with vulcanizing Gunning refractory, it is characterized in that, described periclasite and magnesite clinker particle diameter≤5mm.
5. RH stove lower channel working lining Mg-Al spinel brick as claimed in claim 1 is with vulcanizing Gunning refractory, it is characterized in that, described Al
20
3particle diameter≤2 micron of micro mist.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410149969.5A CN105000892A (en) | 2014-04-15 | 2014-04-15 | Thermal gunning material for RH furnace lower portion groove working lining magnesium-aluminum spinel brick |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410149969.5A CN105000892A (en) | 2014-04-15 | 2014-04-15 | Thermal gunning material for RH furnace lower portion groove working lining magnesium-aluminum spinel brick |
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| CN105000892A true CN105000892A (en) | 2015-10-28 |
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| CN201410149969.5A Pending CN105000892A (en) | 2014-04-15 | 2014-04-15 | Thermal gunning material for RH furnace lower portion groove working lining magnesium-aluminum spinel brick |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109809801A (en) * | 2017-11-21 | 2019-05-28 | 上海梅山钢铁股份有限公司 | A kind of effective gunning refractory of RH furnace dipping |
| CN112479685A (en) * | 2020-11-06 | 2021-03-12 | 鞍山市和丰耐火材料有限公司 | High-quality RH gunning mix with large amount of cast iron powder and production method thereof |
| CN115872729A (en) * | 2021-09-26 | 2023-03-31 | 上海梅山钢铁股份有限公司 | Repair material for torpedo ladle working layer |
Citations (6)
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|---|---|---|---|---|
| CN1348938A (en) * | 2000-10-12 | 2002-05-15 | 吕洪凤 | Technological process of producing forsterite refractory material with borax slime |
| CN101792322A (en) * | 2010-02-23 | 2010-08-04 | 上海柯瑞冶金炉料有限公司 | Environment-friendly aqueous long-life self-flowing repairing mix for converter and preparation method thereof |
| CN101913888A (en) * | 2010-08-18 | 2010-12-15 | 武汉钢铁(集团)公司 | Pouring material for forsterite tundish slag stop wall and production process thereof |
| CN102010212A (en) * | 2010-07-01 | 2011-04-13 | 北京利尔高温材料股份有限公司 | Heating furnace mending material and preparation method thereof |
| CN103408311A (en) * | 2013-07-31 | 2013-11-27 | 南京梅山冶金发展有限公司 | Gunning mix for repairing RH refractory brick |
| CN103601515A (en) * | 2013-11-18 | 2014-02-26 | 河南海格尔高温材料有限公司 | Hot mending material for externally-mounted breathable seat brick and preparation method thereof |
-
2014
- 2014-04-15 CN CN201410149969.5A patent/CN105000892A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1348938A (en) * | 2000-10-12 | 2002-05-15 | 吕洪凤 | Technological process of producing forsterite refractory material with borax slime |
| CN101792322A (en) * | 2010-02-23 | 2010-08-04 | 上海柯瑞冶金炉料有限公司 | Environment-friendly aqueous long-life self-flowing repairing mix for converter and preparation method thereof |
| CN102010212A (en) * | 2010-07-01 | 2011-04-13 | 北京利尔高温材料股份有限公司 | Heating furnace mending material and preparation method thereof |
| CN101913888A (en) * | 2010-08-18 | 2010-12-15 | 武汉钢铁(集团)公司 | Pouring material for forsterite tundish slag stop wall and production process thereof |
| CN103408311A (en) * | 2013-07-31 | 2013-11-27 | 南京梅山冶金发展有限公司 | Gunning mix for repairing RH refractory brick |
| CN103601515A (en) * | 2013-11-18 | 2014-02-26 | 河南海格尔高温材料有限公司 | Hot mending material for externally-mounted breathable seat brick and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109809801A (en) * | 2017-11-21 | 2019-05-28 | 上海梅山钢铁股份有限公司 | A kind of effective gunning refractory of RH furnace dipping |
| CN112479685A (en) * | 2020-11-06 | 2021-03-12 | 鞍山市和丰耐火材料有限公司 | High-quality RH gunning mix with large amount of cast iron powder and production method thereof |
| CN115872729A (en) * | 2021-09-26 | 2023-03-31 | 上海梅山钢铁股份有限公司 | Repair material for torpedo ladle working layer |
| CN115872729B (en) * | 2021-09-26 | 2023-12-05 | 上海梅山钢铁股份有限公司 | Repair material for working layer of torpedo tank |
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Application publication date: 20151028 |
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