CN1261388C - Anti-oxidation silica carbide pouring material - Google Patents
Anti-oxidation silica carbide pouring material Download PDFInfo
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- CN1261388C CN1261388C CN 03113432 CN03113432A CN1261388C CN 1261388 C CN1261388 C CN 1261388C CN 03113432 CN03113432 CN 03113432 CN 03113432 A CN03113432 A CN 03113432A CN 1261388 C CN1261388 C CN 1261388C
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- silicon carbide
- casting material
- mould material
- cement
- castable
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Abstract
The present invention relates to an anti-oxidative silicon carbide casting material, which belongs to the field of refractory materials. The anti-oxidative silicon carbide casting material comprises at most 68 to 72% of large crystal silicon carbide granules whose grain size is smaller than or equal to 7mm, 2 to 12% of alumina cement, 8 to 10 % of silicon carbide matrix which is smaller than or equal to 320 meshes, 5 to 6 % of alpha-Al2O3 micrpowder whose grain size is smaller than or equal to 4 mum, 4 to 5 % of SiO2 micropowder whose grain size is smaller than or equal to 1 mum, 0.1 to 0.3% of boric acid and 1 to 2% of composite antioxidant. The casting material has the advantages of enhanced anti-oxidation, reduced porosity, enhanced slagging resistance, adjustable usable time and improvement on furnace adaptability, and finally the service life of the silicon carbide casting material on incinerators is largely prolonged. The casting material can be suitable for other equipment with the same quality requirement.
Description
Technical field
The present invention relates to a kind of refractory materials, refer to a kind of anti-oxidant carbonization silicon mould material that is used for incinerator especially.
Technical background
Refractory quality is that can incinerator long period in the stove, the key of full load safety in production, incinerator both walls bottom particularly, volatile gases because of the waste incineration generation, melts, flying dust flies effects such as slag, it is good wear-resisting more to require refractory materials to possess, anti-corrosion, anti-slag, performance such as anti-oxidant, the current refractory materials that is used for incinerator both at home and abroad is generally silicon carbide castable, this mould material is that aggregate is made by low cement micro-powder combination with the silicon-carbide particle, actual use and construct in exist obviously not enough, show: one, as the particle diameter of the silicon-carbide particle of aggregate smaller or equal to 5 millimeters, this is to be brought by the technology of producing silicon carbide with sintering theory, its particulate critical size is difficult to above 5 millimeters, and false more material arranged between the silicon-carbide particle of 5-3 millimeter, it is structural loose to cause mould material to occur easily as aggregate, construction thickness also is affected, and work-ing life is not long; Two, the volatilization incineration temperature of obnoxious flavour is between 650-1100 ℃ in the incinerator, this temperature province is the weak section of the oxidation of silicon carbide castable, though be added with the aluminum oxide and the sintering aid silicon ash of gaining in strength in the mould material, does not also fundamentally improve the oxidation-resistance of mould material; Three, mould material is made wedding agent with alundum cement, this single wedding agent makes that the serviceable time of mould material can not regulated at will, is difficult to adapt to the concrete different occasions that China's four corners of the world temperature difference is big, the atmospheric moisture difference is big, can't guarantee the construction quality under various environment.
Summary of the invention
The present invention is just in order to overcome above-mentioned deficiency, and a kind of density height, antioxidant property is strong, the serviceable time can transfer silicon carbide castable are provided, thus the life cycle that has prolonged silicon carbide castable, the maintenance of minimizing incinerator.Main improvement of the present invention is to adopt big crystalline silicon carbide to make aggregate to improve density, the raising of oxidation-resistance has been to add the composite antioxidant of silica flour and aluminium powder composition and the sintering aid of silicon ash and boric acid composition, and the allotment of aluminum oxide speed cement is then adopted in the adjusting of serviceable time.Specifically implement like this:
A kind of improved silicon carbide castable is characterized in that the component proportion relation is: (weight percent)
Big crystalline silicon carbide particle≤7mm 68-72%
Alundum cement 2-12%
Carborundum substrate≤320 order 8-10%
Al
2O
3Micro mist≤4 μ m 5-6%
SiO
2Micro mist≤1 μ m 4-5%
Add:
Boric acid 0.1-0.3%
Composite antioxidant 1-2%
It is main aggregate that the particulate material of mould material of the present invention adopts big crystalline silicon carbide, make the particle critical size of silicon carbide reach 7 millimeters, this multiple stage material compounding and construction thickness for silicon carbide castable brings great proportioning facility, it is loose to have overcome the local structure that cause because of false particle, and void content, volume density, the resistance performance of slag corrosion of silicon carbide castable are significantly improved; Alundum cement in the silicon carbide castable prescription is by soon, slow alundum cement is formed, the bound energy of speed alundum cement improves the serviceable time of mould material, make silicon carbide castable can adapt to winter, summer, the construction environment that the high-altitude is different with ground, fast cement can shorten the presetting period, slow cement can improve the serviceable time, adopt both couplings can produce the silicon carbide castable of different serviceable times, overcome loss of strength and the high-temperature behavior loss of adopting accelerating chemicals and retardant to bring with speed cement, effectively guaranteed the use properties of mould material, the content of speed cement is relevant with environment for use, summer temperature is higher, increase fast cement consumption, winter temperature is lower, increase the consumption of slow cement, thereby the component proportioning of silicon carbide castable is: (weight percent)
Big crystalline silicon carbide particle≤7mm 68-72%
Fast alundum cement 1-6%
Slow alundum cement 1-6%
Carborundum substrate＜320 order 8-10%
Al
2O
3Micro mist≤4 μ m 5-6%
SiO
2Micro mist≤1 μ m 4-5%
Add:
Boric acid 0.1-0.3%
Composite antioxidant 1-2%
The big crystalline silicon carbide that the present invention a uses material adopts grating than configuration, 7-5mm: 5-3mm: 3-1mm: 1-0mm=1.2-1.4: 1-1.1: 1.2-1.4: 1.
The composite antioxidant that the present invention adopts is the composition of metallic silicon power and metallic aluminium powder, and the proportionlity of silica flour and aluminium powder is 1.5-2.5: 1, and composite antioxidant is at sintering aid silicon ash (SiO
2Micro mist) with the effect of boric acid under, can make silicon carbide castable is at surface formation layer of silicon dioxide film in organic waste and alkali-metal temperature ranges between 800-1200 ℃, this film can stop the further oxidation of silicon carbide, thereby has prolonged the work-ing life of incinerator.
After silicon carbide castable is as furnace wall; need quick baking; in order to guarantee not explosion in the baking; usually also be added with a certain amount of detonation suppressor; generally all adopt single explosion-proof fiber; single explosion-proof fiber had not only influenced intensity but also had influenced the flowability of mould material; in order to overcome loss of strength and the mobile defective that reduces; the present invention adopts the composite anti-explosion agent; its outer dosage is the 0.1-0.2% of mould material weight; with combination in 1: 1, the interpolation of composite anti-explosion agent made the silicon carbide castable can quick baking and not explosion can not influence workability and use properties by explosion-proof fiber and aluminum fiber in this composite anti-explosion agent.
The manufacture method of mould material of the present invention be with other each component except that big crystalline silicon carbide particle by proportion relation ball mill thorough mixing, and then carry out secondary with big crystalline silicon carbide particulate material and mix.Adopting secondary blended purpose mainly is that minor amounts of additives can be distributed in the matrix full and uniformly, makes it to bring into play maximum effect, guarantees the overall performance of mould material.
Improve later silicon carbide castable through technology and proportioning, improved antioxidant property, reduced void content, strengthened anti-slagging of retractory ability, serviceable time has adjustability, improved the baker adaptive faculty, silicon carbide castable is improved the work-ing life on incinerator greatly, other Thermal Equipment that this mould material requires applicable to equal in quality equally.
Embodiment
Embodiment 1, is applicable to the anti-oxidant carbonization silicon mould material of spring and autumn, and its component weight proportion relation is:
20 parts of big crystalline silicon carbide particle 7-5mm
15 parts of 5-3mm
20 parts of 3-1mm
16 parts of 1-0mm
10 parts of carborundum substrates＜320 orders
5 parts of fast alundum cements
5 parts of slow alundum cements
Al
2O
35 parts of micro mists≤4 μ m
SiO
24 parts of micro mists≤1 μ m
Add:
0.15 part of boric acid
0.3 part of aluminium powder
0.8 part of silica flour
Embodiment 2, are applicable to the anti-oxidant carbonization silicon mould material in winter, and its component weight proportion relation is:
18 parts of big crystalline silicon carbide particle 7-5mm
16 parts of 5-3mm
20 parts of 3-1mm
15 parts of 1-0mm
10 parts of carbide fine powder＜320 orders
6 parts of fast alundum cements
3 parts of slow alundum cements
Al
2O
36 parts of micro mists≤4 μ m
SiO
25 parts of micro mists≤1 μ m
Add:
0.2 part of boric acid
0.3 part of aluminium powder
0.7 part of silica flour
0.05 part of explosion-proof fiber
0.05 part of aluminum fiber
Embodiment 3, are applicable to the anti-oxidant carbonization silicon mould material in summer, and its component weight proportion relation is:
20 parts of big crystalline silicon carbide particle 7-5mm
16 parts of 5-3mm
21 parts of 3-1mm
15 parts of 1-0mm
9 parts of carbide fine powder＜320 orders
3 parts of fast alundum cements
5 parts of slow alundum cements
Al
2O
36 parts of micro mists≤4 μ m
SiO
25 parts of micro mists≤1 μ m
Add:
0.25 part of boric acid
0.5 part of aluminium powder
1.25 parts of silica flours
0.1 part of explosion-proof fiber
0.1 part of aluminum fiber
The mould material that above embodiment relates to, after testing, its performance perameter is:
Volume density 2.5-2.6g/cm
3
Compressive strength (1350 ℃ * 3h): 〉=60Mpa
Burning the back line changes: (1350 ℃ * 3h): 0～-0.25%
Claims (9)
1. anti-oxidant carbonization silicon mould material is characterized in that the component proportion relation is: (weight percent)
Big crystalline silicon carbide particle≤7mm 68-72%
Alundum cement 2-12%
Carborundum substrate≤320 order 8-10%
Al
2O
3Micro mist≤4 μ m 5-6%
SiO
2Micro mist≤1 μ m 4-5%
Add:
Boric acid 0.1-0.3%
Composite antioxidant 1-2%.
2. silicon carbide castable according to claim 1 is characterized in that alundum cement is made up of fast alundum cement and slow alundum cement.
3. silicon carbide castable according to claim 2 is characterized in that the component proportion relation is: (weight percent)
Big crystalline silicon carbide particle≤7mm 68-72%
Fast alundum cement 1-6%
Slow alundum cement 1-6%
Carborundum substrate＜320 order 8-10%
Al
2O
3Micro mist≤4 μ m 5-6%
SiO
2Micro mist≤1 μ m 4-5%
Add:
Boric acid 0.1-0.3%
Composite antioxidant 1-2%.
4. according to the described silicon carbide castable in one of claim 1 or 3, it is characterized in that big crystalline silicon carbide particulate grating pass is: 7-5mm: 5-3mm: 3-1mm: 1-0mm=1.2-1.4: 1-1.1: 1.2-1.4: 1.
5. according to claim 1,2, one of 3 described silicon carbide castables, it is characterized in that composite antioxidant is the composition of metallic silicon power and metallic aluminium powder.
6. silicon carbide castable according to claim 5 is characterized in that the proportionlity of silica flour and aluminium powder is 1.5-2.5 in the composite antioxidant: 1.
7. according to claim 1,2,3, one of 6 described silicon carbide castables, it is characterized in that mould material is added with the composite anti-explosion agent at home and abroad, its outer dosage is the 0.1-0.2% of mould material weight.
8. silicon carbide castable according to claim 7, it is characterized in that the composite anti-explosion agent by explosion-proof fiber and aluminum fiber with combination in 1: 1.
9. according to the manufacture method of claim 1,2,3,6, one of 8 described silicon carbide castables, it is characterized in that will except that other each component the big crystalline silicon carbide particle by proportion relation ball mill thorough mixing, and then carry out secondary with big crystalline silicon carbide particulate material and mix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03113432 CN1261388C (en) | 2003-05-09 | 2003-05-09 | Anti-oxidation silica carbide pouring material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03113432 CN1261388C (en) | 2003-05-09 | 2003-05-09 | Anti-oxidation silica carbide pouring material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1450023A CN1450023A (en) | 2003-10-22 |
| CN1261388C true CN1261388C (en) | 2006-06-28 |
Family
ID=28684070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03113432 Expired - Fee Related CN1261388C (en) | 2003-05-09 | 2003-05-09 | Anti-oxidation silica carbide pouring material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1261388C (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100341820C (en) * | 2006-04-04 | 2007-10-10 | 天津泽希矿产加工有限公司 | Refractory materials for garbage destructor |
| CN101182219B (en) * | 2006-11-14 | 2012-02-08 | 贵州世纪天元矿业有限公司 | Silicon carbide deacidizing tank and preparation method thereof |
| CN100548924C (en) * | 2006-09-29 | 2009-10-14 | 宜兴市振球炉料有限公司 | Copper anode furnace is with refractory castable and chute prefabricated component |
| FR2924711B1 (en) * | 2007-12-11 | 2010-11-19 | Saint Gobain Ct Recherches | REFRACTORY PRODUCT WITH MATRIX OF SIALON DOPE |
| CN101386542B (en) * | 2008-10-14 | 2012-07-04 | 山东科技大学 | SiC refractory materials and producing method thereof |
| CN103539469B (en) * | 2013-10-29 | 2015-06-10 | 宁夏天纵泓光余热发电技术有限公司 | Refractory castable for incinerator |
| CN104876591B (en) * | 2015-03-06 | 2017-05-31 | 湖北斯曼新材料有限公司 | A kind of anti-erosion oxidant used for refractory material and preparation method thereof |
| CN105884366A (en) * | 2016-04-08 | 2016-08-24 | 三责（上海）新材料科技有限公司 | Light high-strength silicon carbide kiln furniture and manufacturing method thereof |
| CN106045542A (en) * | 2016-07-25 | 2016-10-26 | 宜兴市中环耐火材料有限公司 | High-temperature-creep-resistant wear-resistant pouring material for circulating fluidized bed boiler |
| CN107434405A (en) * | 2017-08-31 | 2017-12-05 | 云南濮耐昆钢高温材料有限公司 | A kind of high-strength resistive connection skin silicon carbide castable using useless high alumina electrical porcelain production |
| CN115141008B (en) * | 2022-07-25 | 2023-09-01 | 河北国亮新材料股份有限公司 | Long-service-life swing groove castable and preparation method thereof |
| CN115403391B (en) * | 2022-08-16 | 2023-06-23 | 鄂尔多斯市西金矿冶有限责任公司 | Silicon carbide-based castable for repairing carbonaceous furnace eye bricks and preparation method thereof |
| CN116178025A (en) * | 2023-03-24 | 2023-05-30 | 长兴兴鹰新型耐火建材有限公司 | High-strength light explosion-proof castable |
-
2003
- 2003-05-09 CN CN 03113432 patent/CN1261388C/en not_active Expired - Fee Related
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|---|---|
| CN1450023A (en) | 2003-10-22 |
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