CN105198457A - Converter slag-stopping inner nozzle brick and preparation method thereof - Google Patents
Converter slag-stopping inner nozzle brick and preparation method thereof Download PDFInfo
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- CN105198457A CN105198457A CN201510616681.9A CN201510616681A CN105198457A CN 105198457 A CN105198457 A CN 105198457A CN 201510616681 A CN201510616681 A CN 201510616681A CN 105198457 A CN105198457 A CN 105198457A
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- powder
- inner nozzle
- nozzle brick
- converter slag
- resisting inner
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Abstract
The invention discloses a converter slag-stopping inner nozzle brick and a preparation method thereof. The brick is prepared from, by weight, 50%-60% of plate-shaped corundum particles, 1%-16% of fused spinel particles, 10%-20% of fused corundum powder, 2%-18% of fused spinel powder, 1%-6% of alpha-Al2O3 micro powder, 0.3%-3.0% of black silicon carbide powder, 0.3%-3.0% of metallic silicon powder, 1%-2% of sialon powder, 2%-6% of clay powder, 0.3%-3.0% of -195C graphite and resin binders, wherein the resin binders account for 3%-5% of the total mass of all other components. The converter slag-stopping inner nozzle brick has the advantages that the sialon powder is added, air holes which are evenly distributed and have superfine sizes are formed in the product use process, the elastic strain energy can be well absorbed and dissipated, the destructive effect of thermal stress on materials is alleviated, the thermal shock resistance of the inner nozzle brick is improved, the anti-stripping property of the inner nozzle brick and the resistance of the inner nozzle brick to slags and erosion of molten steel are improved, the service life is prolonged, and potential safety hazards are eliminated.
Description
Technical field
The present invention relates to a kind of Refractory For Steelmaking, particularly relate to a kind of converter slag-resisting inner nozzle brick and preparation method thereof.
Background technology
The magnesium carbon of converter current slag-blocking system many employings mechanical pressing or magnalium carbonaceous inner nozzle brick, with magnesia, corundum, bauxitic clay for main raw material, add appropriate carbon materials, and as graphite or carbon black, take resol as bonding agent, machine pressure forms.But in use there are the following problems for magnesium carbon or magnalium carbonaceous inner nozzle brick: 1) when applied at elevated temperature, the carbon that bonding agent is easy to be oxidized and loses wherein, not only cause short texture, strength degradation, and corrosion resistance significantly declines, work-ing life is short, generally only can use about 20-40 time, and production cost increases; 2) intensity due to magnesium carbon or magnalium carbonaceous inner nozzle brick is low, and heat-shock resistance is poor, and in use procedure, inner nozzle brick easily occurs crackle, causes bleed-out, burns out slag damming mechanism, and converter can not normally be produced, and bleed-out exists serious potential safety hazard.
From recent technology trends both at home and abroad, following several approach is had to improve the performance of inner nozzle brick:
(1) improve the performance of goods by improving material, such as improve material class, substitute high-alumina fly with corundum fine powder, spinel fine powder substitutes high-alumina fly, to improve erosion-resisting characteristics and the performance of flushing of goods;
(2) improve manufacturing process, such as, adopt Nitriding Technology, make goods form silicon nitride, Sialon combines, increase substantially product strength, improve thermal shock resistance and resistance to erosion ability;
(3) carry out light-burned oil immersion, reduce void content, improve intensity, increase carbon left and improve corrosion resistance,
But above-mentioned several mode still cannot meet the needs of present converter smelting variety steel.
Summary of the invention
In order to overcome the defect of existing converter slag-resisting inner nozzle brick technology, the object of the invention is to provide a kind of converter slag-resisting inner nozzle brick, in this brick, carbon content is lower than 3%, adding Sialon powder 1 ~ 2% makes it to molten steel not carburetting, the requirement of converter smelting variety steel can be met, there is erosion performance and the thermal shock resistance of good opposing molten steel and slag, thus meet the production of Clean Steel and ultra low-carbon steel, reduce peeling off of in use inner nozzle brick generation, extend its work-ing life, eliminate in use potential safety hazard.
A kind of converter slag-resisting inner nozzle brick, is characterized in that the feed composition components by weight percentage of this brick is as follows: plate diamond spar particle 50 ~ 60%, electric smelting spinel particle 1 ~ 16%, fused corundom powder 10 ~ 20%, electric smelting spinel powder 2 ~ 18%, α-Al
2o
3micro mist 1 ~ 6%, black silicon carbide powder 0.3 ~ 3.0%, metallic silicon power 0.3 ~ 3.0%, Sialon powder 1 ~ 2%, clay powder 2 ~ 6% ,-195C graphite 0.3 ~ 3.0%, the additional resinoid bond accounting for said components total mass 3 ~ 5%.
Preferably, the grain type of described plate diamond spar particle is distributed as: 3 ~ 5mm, 1 ~ 3mm, 0 ~ 1mm, and the mass percent of its chemical composition is: Al
2o
3>=98%, SiO
2≤ 0.1%, Fe
2o
3≤ 0.2%, Na
2o+K
2o≤0.2%.
Preferably, the grain type of described electric smelting spinel particle is 3 ~ 5mm, and the grain type of electric smelting spinel powder is 200 orders, and the mass percent of its chemical composition is: Al
2o
3>=78%, MgO>=21.0%, SiO
2≤ 0.05%, Fe
2o
3≤ 0.2%, Na
2o+K
2o≤0.2%.
Preferably, the grain type of described fused corundom powder is 320 orders, and the mass percent of its chemical composition is: Al
2o
3>=94.5%, TiO
2: 1.5 ~ 3.8%, SiO
2≤ 0.8%, Fe
2o
3≤ 0.3%, Na
2o+K
2o≤0.3%.
Preferably, the grain type of described black silicon carbide powder is 320 orders, and wherein SiC content is: SiC >=98.5%.
Preferably, the grain type of described metallic silicon power is 320 orders, and wherein Si content is: Si >=98.0%.
Described-195C granular graphite type is 100 orders, and wherein C content is: C >=95.0%.
Preferably, the grain type of described Sialon powder is 5 μm, and wherein Sialon content is: Sialon >=98.0%.
Preferably, α-Al
2o
3the grain type of micro mist is 5 μm, and the component comprised and weight percent are: Al
2o
3>=98.0%, SiO
2≤ 0.3%, Na
2o+K
2o≤0.4%.
Above-mentioned bonding agent is modified resin, and its performance is as follows:
The present invention also provides the preparation method producing above-mentioned converter slag-resisting inner nozzle brick, specifically carries out according to the following steps:
The first step, batch mixing
1) prepare burden, first by fused corundom powder, electric smelting spinel powder, α-Al according to the weight percent of converter slag-resisting inner nozzle brick component
2o
3micro mist, Sialon powder, black silicon carbide powder, metallic silicon power and clay powder grind altogether, mix, and make common abrasive dust;
2) when producing, first plate diamond spar particle and electric smelting spinel particle are dry mixed in said components ratio in high speed mixing pan and roll 2 ~ 5 minutes, then disposablely in 2 minutes slowly resinoid bond is added, resin is dispersed in after on particle completely, add-195C graphite and roll 2 ~ 5 minutes, add all altogether abrasive dust mixing discharging, then ageing mixture 20 hours after 20 ~ 30 minutes again;
Second step, compression moulding
Select 500 t hydraulic press or 630 tons of friction press compression mouldings;
3rd step, thermal treatment
Thermal treatment more than 24 hours in moisture eliminator, wherein entering kilneye temperature must not higher than 60 DEG C, baking time more than 8 hours, 110 DEG C of baking times more than 8 hours, 200 ~ 250 DEG C of baking times more than 8 hours;
4th step, finished product pick
Kiln discharge pick, obtains converter slag-resisting inner nozzle brick.
Compared with prior art, advantage is:
1) by adding novel non-oxidized substance Sialon powder, to be mixed technique by high-speed constant-temperature, make it to be uniformly dispersed, the pore fine with size that be evenly distributed is formed in goods use, can be good at absorbing and dissipation elastic strain energy, relief of thermal stress, to the destruction of material, improves the thermal shock resistance of inner nozzle brick, improves the erosion performance of its resistance to flaking and opposing slag and molten steel;
2) adopt metallic silicon power and black silicon carbide powder composite antioxidant, effectively prevent resin oxidation at high temperature, significantly reduce the structure spalling that material causes because of high temperature oxidation decarburization, increase the service life, eliminate safe hidden trouble;
3) add low bulk performance electric smelting spinel, absorb the stress that aggregate thermal expansion produces, improve heat-shock resistance and resistance to flaking.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is the schema of preparation method's production technique of converter slag-resisting inner nozzle brick.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
The converter slag-resisting inner nozzle brick that embodiment 1 the present invention produces for our company.The feed composition components by weight percentage of this brick is as follows: plate diamond spar particle 53%, electric smelting spinel particle 10%, fused corundom powder 12%, electric smelting spinel powder 14%, α-Al
2o
3micro mist 1%, black silicon carbide powder 2%, metallic silicon power 2%, Sialon powder 1.5%, clay powder 4% ,-195C graphite 0.5%, the additional resinoid bond accounting for said components total mass 4.5%.
In the present embodiment, the grain type of described plate diamond spar particle is distributed as: 3 ~ 5mm, 1 ~ 3mm, 0 ~ 1mm, and the mass percent of its chemical composition is: Al
2o
398.32%, SiO
20.06%, Fe
2o
30.12%, Na
2o+K
2o0.18%.
In the present embodiment, the grain type of described electric smelting spinel particle is 3 ~ 5mm, and the grain type of electric smelting spinel fine powder is 200 orders, and the mass percent of its chemical composition is: Al
2o
378.16%, MgO21.29%, SiO
20.05%, Fe
2o
30.2%, Na
2o+K
2o0.2%.
In the present embodiment, the grain type of described fused corundom powder is 320 orders, and the mass percent of its chemical composition is: Al
2o
397%, TiO
21.6%, SiO
20.8%, Fe
2o
30.3%, Na
2o+K
2o0.3%.
In the present embodiment, the grain type of described black silicon carbide powder is 320 orders, and wherein SiC content is: SiC98.9%.
In the present embodiment, the grain type of described metallic silicon power is 320 orders, and wherein Si content is: Si98.5%.
In the present embodiment, described-195C granular graphite type is 100 orders, and wherein C content is: C95.2%.
In the present embodiment, the grain type of described Sialon powder is 5 μm, and wherein Sialon content is: Sialon98.7%.
In the present embodiment, described α-Al
2o
3the grain type of micro mist is 5 μm, and the component comprised and weight percent are: Al
2o
3>=99.3%, SiO
20.3%, Na
2o+K
2o0.4%.
Above-mentioned bonding agent is modified resin, and its performance is as follows:
Embodiment 2 is with embodiment 1, and design parameter is in table 1.
Embodiment 3 is with embodiment 1, and design parameter is in table 1.
Embodiment 4 is with embodiment 1, and design parameter is in table 1.
Embodiment 5 is with embodiment 1, and design parameter is in table 1.
Table 1 various embodiments of the present invention adopt grain type and the per-cent of batching
The present invention also provides the preparation method producing above-mentioned converter slag-resisting inner nozzle brick, specifically carries out according to the following steps:
The first step, batch mixing
1) prepare burden, first by fused corundom powder, electric smelting spinel powder, α-Al according to the weight percent of converter slag-resisting inner nozzle brick component
2o
3micro mist, Sialon powder, black silicon carbide powder, metallic silicon power and clay powder grind altogether, mix, and make common abrasive dust;
2) when producing, first plate diamond spar particle and electric smelting spinel particle are dry mixed in said components ratio in high speed mixing pan and roll 2 ~ 5 minutes, then disposablely in 2 minutes slowly resinoid bond is added, resin is dispersed in after on particle completely, add-195C graphite and roll 2 ~ 5 minutes, add all altogether abrasive dust mixing discharging, then ageing mixture 20 hours after 20 ~ 30 minutes again;
Second step, compression moulding
Select 500 t hydraulic press or 630 tons of friction press compression mouldings;
3rd step, thermal treatment
Thermal treatment more than 24 hours in moisture eliminator, wherein entering kilneye temperature must not higher than 60 DEG C, baking time more than 8 hours, 110 DEG C of baking times more than 8 hours, 200 ~ 250 DEG C of baking times more than 8 hours;
4th step, finished product pick
Kiln discharge pick, obtains converter slag-resisting inner nozzle brick.
The main physical and chemical index that the above embodiment of the present invention obtains converter slag-resisting inner nozzle brick is as follows: Al
2o
3>=88%, volume density>=3.20g/cm after MgO>=2%, C≤3%, 200 DEG C of bakings
3, apparent porosity (200 DEG C × 24h)≤8%, compressive strength (200 DEG C × 24h)>=80MPa, Linear change rate (1600 DEG C × 3h) 0 ~ 1.0%.
This product uses through converter slag-resisting system, its work-ing life >=50 times, in use intensity high, resistant to corrosion, Heat stability is good.
Claims (10)
1. a converter slag-resisting inner nozzle brick, is characterized in that, the feed composition components by weight percentage of this brick is as follows: plate diamond spar particle 50 ~ 60%, electric smelting spinel particle 1 ~ 16%, fused corundom powder 10 ~ 20%, electric smelting spinel powder 2 ~ 18%, α-Al
2o
3micro mist 1 ~ 6%, black silicon carbide powder 0.3 ~ 3.0%, metallic silicon power 0.3 ~ 3.0%, Sialon powder 1 ~ 2%, clay powder 2 ~ 6% ,-195C graphite 0.3 ~ 3.0%, additionally account for said components total mass resinoid bond 3 ~ 5%.
2. converter slag-resisting inner nozzle brick according to claim 1, is characterized in that, the grain type of described plate diamond spar particle is distributed as: 3 ~ 5mm, 1 ~ 3mm, 0 ~ 1mm, and the mass percent of its chemical composition is: Al
2o
3>=98%, SiO
2≤ 0.1%, Fe
2o
3≤ 0.2%, Na
2o+K
2o≤0.2%.
3. converter slag-resisting inner nozzle brick according to claim 2, is characterized in that, the grain type of described electric smelting spinel particle is 3 ~ 5mm, and the grain type of electric smelting spinel powder is 200 orders, and the mass percent of its chemical composition is: Al
2o
3>=78%, MgO>=21.0%, SiO
2≤ 0.05%, Fe
2o
3≤ 0.2%, Na
2o+K
2o≤0.2%.
4. converter slag-resisting inner nozzle brick according to claim 3, is characterized in that, the grain type of described fused corundom powder is 320 orders, and the mass percent of its chemical composition is: Al
2o
3>=94.5%, TiO
2: 1.5 ~ 3.8%, SiO
2≤ 0.8%, Fe
2o
3≤ 0.3%, Na
2o+K
2o≤0.3%.
5. converter slag-resisting inner nozzle brick according to claim 4, is characterized in that, the grain type of described black silicon carbide powder is 320 orders, and wherein SiC content is: SiC >=98.5%.
6. converter slag-resisting inner nozzle brick according to claim 5, is characterized in that, the grain type of described metallic silicon power is 320 orders, and wherein Si content is: Si >=98.0%.
7. converter slag-resisting inner nozzle brick according to claim 6, is characterized in that, described-195C granular graphite type is 100 orders, and wherein C content is: C >=95.0%.
8. converter slag-resisting inner nozzle brick according to claim 7, is characterized in that, the grain type of described Sialon powder is 5 μm, and wherein Sialon content is: Sialon >=98.0%.
9. converter slag-resisting inner nozzle brick according to claim 8, is characterized in that, described α-Al
2o
3the grain type of micro mist is≤5 μm, and the component comprised and weight percent are: Al
2o
3>=98.0%, SiO
2≤ 0.3%, Na
2o+K
2o≤0.4%.
10. a preparation method for converter slag-resisting inner nozzle brick, is characterized in that, specifically carries out according to the following steps:
The first step, batch mixing
1) prepare burden, first by fused corundom powder, electric smelting spinel powder, α-Al according to the weight percent of converter slag-resisting inner nozzle brick component
2o
3micro mist, Sialon powder, black silicon carbide powder, metallic silicon power and clay powder grind altogether, mix, and make common abrasive dust;
2) when producing, first plate diamond spar particle and electric smelting spinel particle are dry mixed in said components ratio in high speed mixing pan and roll 2 ~ 5 minutes, then disposablely in 2 minutes slowly resinoid bond is added, resin is dispersed in after on particle completely, add-195C graphite and roll 2 ~ 5 minutes, add all altogether abrasive dust mixing discharging, then ageing mixture 20 hours after 20 ~ 30 minutes again;
Second step, compression moulding
Select 500 t hydraulic press or 630 tons of friction press compression mouldings;
3rd step, thermal treatment
Thermal treatment more than 24 hours in moisture eliminator, wherein entering kilneye temperature must not higher than 60 DEG C, baking time more than 8 hours, 110 DEG C of baking times more than 8 hours, 200 ~ 250 DEG C of baking times more than 8 hours;
4th step, finished product pick
Kiln discharge pick, obtains converter slag-resisting inner nozzle brick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510616681.9A CN105198457A (en) | 2015-09-25 | 2015-09-25 | Converter slag-stopping inner nozzle brick and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510616681.9A CN105198457A (en) | 2015-09-25 | 2015-09-25 | Converter slag-stopping inner nozzle brick and preparation method thereof |
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|---|---|
| CN105198457A true CN105198457A (en) | 2015-12-30 |
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ID=54946484
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|---|---|---|---|
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106495715A (en) * | 2016-10-26 | 2017-03-15 | 马鞍山利尔开元新材料有限公司 | A kind of ZrB2Outer nozzle brick of SiC powder modified converter slag-resistings slide gate nozzle and preparation method thereof |
| CN106747515A (en) * | 2016-12-26 | 2017-05-31 | 中钢集团耐火材料有限公司 | A kind of large-scale three deferrizations water receptacle working lining composite and preparation method |
| CN107400752A (en) * | 2017-09-26 | 2017-11-28 | 湖南湘钢瑞泰科技有限公司 | Tapping hole assembly and converter |
| CN107555970A (en) * | 2017-09-26 | 2018-01-09 | 辽宁科技大学 | One kind utilizes discarded Al2O3C production fish torpedo ladles Al2O3SiC C refractory brick and preparation method thereof |
| CN108772532A (en) * | 2018-06-19 | 2018-11-09 | 马鞍山市益丰实业集团有限公司 | A kind of box moulding sand formula and preparation process |
| CN111116204A (en) * | 2019-12-13 | 2020-05-08 | 北京瑞普同创科技发展有限公司 | High-performance blast furnace main channel slag retaining wall prefabricated part, and preparation method and construction method thereof |
| CN118125808A (en) * | 2024-05-08 | 2024-06-04 | 济南双凤耐火材料有限公司 | Sewer nozzle brick and preparation method thereof |
-
2015
- 2015-09-25 CN CN201510616681.9A patent/CN105198457A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 钟香崇: "新一代矾土基耐火材料", 《硅酸盐通报》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106495715A (en) * | 2016-10-26 | 2017-03-15 | 马鞍山利尔开元新材料有限公司 | A kind of ZrB2Outer nozzle brick of SiC powder modified converter slag-resistings slide gate nozzle and preparation method thereof |
| CN106495715B (en) * | 2016-10-26 | 2019-10-25 | 马鞍山利尔开元新材料有限公司 | A kind of ZrB2Nozzle brick and preparation method thereof outside-SiC powder modified converter slag-resisting slide gate nozzle |
| CN106747515A (en) * | 2016-12-26 | 2017-05-31 | 中钢集团耐火材料有限公司 | A kind of large-scale three deferrizations water receptacle working lining composite and preparation method |
| CN107400752A (en) * | 2017-09-26 | 2017-11-28 | 湖南湘钢瑞泰科技有限公司 | Tapping hole assembly and converter |
| CN107555970A (en) * | 2017-09-26 | 2018-01-09 | 辽宁科技大学 | One kind utilizes discarded Al2O3C production fish torpedo ladles Al2O3SiC C refractory brick and preparation method thereof |
| CN108772532A (en) * | 2018-06-19 | 2018-11-09 | 马鞍山市益丰实业集团有限公司 | A kind of box moulding sand formula and preparation process |
| CN111116204A (en) * | 2019-12-13 | 2020-05-08 | 北京瑞普同创科技发展有限公司 | High-performance blast furnace main channel slag retaining wall prefabricated part, and preparation method and construction method thereof |
| CN111116204B (en) * | 2019-12-13 | 2024-02-27 | 北京瑞普同创科技发展有限公司 | Prefabricated part of slag blocking wall of main channel of high-performance blast furnace, preparation method and construction method |
| CN118125808A (en) * | 2024-05-08 | 2024-06-04 | 济南双凤耐火材料有限公司 | Sewer nozzle brick and preparation method thereof |
| CN118125808B (en) * | 2024-05-08 | 2024-07-19 | 济南双凤耐火材料有限公司 | Sewer nozzle brick and preparation method thereof |
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Application publication date: 20151230 |