CN1155540C - High-strength antiwear refractory brick - Google Patents
High-strength antiwear refractory brick Download PDFInfo
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- CN1155540C CN1155540C CNB001112147A CN00111214A CN1155540C CN 1155540 C CN1155540 C CN 1155540C CN B001112147 A CNB001112147 A CN B001112147A CN 00111214 A CN00111214 A CN 00111214A CN 1155540 C CN1155540 C CN 1155540C
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- corundum
- alumine
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Abstract
The present invention relates to an antiwear refractory brick for a circulation fluidized bed boiler, a boiling furnace, etc. The present invention is prepared by that a high-temperature refractory material is compounded according to a scientific and reasonable grade. The cost of the antiwear refractory brick of the present invention is equivalent to a common antiwear material or is slightly increased, but performance is greatly enhanced. Compression resistant strength reaches 120 to 250MPa, and wear resistant quantity at normal temperature is 1.9 to 4.5cm<3>. The present invention is particularly suitable for serious flushing and abrasion parts in kilns, such as circulation fluidized bed boilers, boiling furnaces, etc.
Description
Technical field
The present invention relates to a kind of circular fluid bed, fluidizing furnace and other process kiln stove abrasion-proof and refractory goods.
Background technology
Advance over 20 years,, the wear resisting property of refractory materials has been proposed very harsh requirement along with applying of Industrial Stoves such as circular fluid bed, fluidizing furnace.Traditional in the past refractory materials as clay brick, common high alumina brick etc., can't satisfy the needs of circular fluid bed, fluidizing furnace.As clay brick only be about 3～6 months in circulating fluidized bed serious wear position work-ing life.Many producers had carried out the exploitation and the production of wearing-proof refractory material both at home and abroad in recent years, and its product wear resisting property is greatly improved than the wear resisting property of common refractory brick, and the wear-resisting amount of normal temperature is generally at 5～10cm
3Between.May 24 nineteen ninety-five, disclosed Chinese patent application 94111485.6 provided a kind of wearing-proof refractory material that includes skeleton material and matrix material composition, it is characterized in that said skeleton material package draws together 10～30% (weight, as follows) corundum and/or mullite, 5～25% high-aluminium vanadine and/or flint clay, 10～40% natural sillimanite class mineral; Said matrix material package is drawn together 10～25% clay, 20～40% natural sillimanite class mineral.The cold crushing strength of its product is 76～96.3MPa, and the wear-resisting amount of normal temperature is 7.8～10cm
3Though the wearing-proof refractory material quality was greatly improved than former common refractory in recent years, performance is desirable not enough, still influences the normal operation of circulating fluidized bed.Also there is the use high grade refractory in some producer, and as silicon nitride, in conjunction with nitrogenize silica brick, (the wear-resisting amount of normal temperature is at 1.8cm though wear resisting property is fine
3About), but its prices are rather stiff.
Summary of the invention
The purpose of this invention is to provide the antiwear refractory brick that a kind of price comparison is cheap and wear resisting property is good,, prolong the work-ing life of refractory liner with the rapid popularization that adapts to circular fluid bed and the needs of maximization.
The technical solution used in the present invention is:
A kind of high-strength antiwear refractory brick is characterized in that having the high-temperature flame-proof material to press the preparation of column weight magnitude batching:
Particle diameter d is the aggregate 30%～70% of 12mm＞d 〉=1mm
Particle diameter d is the small-particle material 5%～30% of 1mm＞d 〉=0.1mm
Particle diameter d is the fine powder 25%～50% of d＜0.1mm
Aggregate be in three kinds of the alumines, silicon carbide, corundum one or both, three kinds combination; The small-particle material is one or more the combination in silicon carbide, corundum, alumine, the zircon; Fine powder is the combination of heavy two or more of corundum, silicon carbide, alumine, silicon-dioxide, aluminium sesquioxide; The batching China and foreign countries are added with the moulding wedding agent of 0.5%～15% gross weight ratio and the moulding additive of 0.1%～3% gross weight ratio.
The moulding wedding agent is one or more the combination in bonding clay, refractory cements, phosphoric acid, the aluminum phosphate.
Additive is the combination of heavy one or more of oxalic acid, tripoly phosphate sodium STPP, humic acids, Sodium hexametaphosphate 99.
In the present invention, aggregate partly adopts alumine, silicon carbide, refractory raw material that the corundum hardness ratio is bigger, mainly plays skeleton function, is the main body of material.Space between the partially filled aggregate macrobead of small-particle makes material fine and close more.The fine powder part mainly is to fill tiny space to make material more closely knit, and aggregate is wrapped up.Sintering at first takes place in the powder part under the high temperature, and powder, aggregate are combined firmly, produces very big intensity, improves the wear resisting property of material greatly, makes material add acutely washing away down of band solid particulate at high velocity air and does not does not wear and tear.The wedding agent part combines generation intensity at normal temperature and high-temperature time with aggregate in the material and powder.The main effect of admixture part is a processability of improving material, increases the intensity of material.
The preparation production technique of antiwear refractory brick of the present invention is the same substantially with ordinary method, does not have special requirement, and is simple, implements easily.Burn till (1000～1350 ℃) through batching, stirring, moulding (vibrating casting or machine are pressed), oven dry, thermal treatment (200～500 ℃) or high temperature successively, cool off at last and make.
Antiwear refractory brick cost of the present invention and common refractory quite or slightly have increase, but performance improves a lot.Its compressive strength reaches 120～250MPa after testing, and the wear-resisting amount of normal temperature is 1.9～4.5cm
3The most serious position of wearing and tearing is made the industrialness experimental result and is found that the surface of experiment material after three months do not find the vestige of any erosive wear in circular fluid bed, and can reach more than 4 years endurance expectation.Its intensity of antiwear refractory brick of the present invention, wear resisting property are greatly improved than common high-abrasive material, are very suitable for the position that erosive wear is serious in the kilns such as circular fluid bed, fluidizing furnace and use.
Embodiment
The present invention will be described in more detail below in conjunction with embodiment.
Experiment with refractory materials is:
Aggregate diameter particle diameter d is 12mm＞d 〉=1mm, and small-particle material particle diameter d is 1mm＞d 〉=0.1mm, and fine powder particle diameter d is d＜0.1mm.
| Embodiment 1 | Alumine aggregate 32%, corundum aggregate 10%, carborundum aggregate 5%, alumine small-particle 10%, silicon carbide small-particle 6%, alumine fine powder 20%, aluminium sesquioxide fine powder 6%, fine silica 5%, high-alumina cement adds 5%, tripoly phosphate sodium STPP adds 0.1%, and Sodium hexametaphosphate 99 adds 0.1%.1150～1250 ℃ of firing temperatures. | Casting |
| Embodiment 2 | Carborundum aggregate 20%, alumine aggregate 20%, corundum aggregate 10%, alumine small-particle 15%, zircon sand 5%, alumine fine powder 20%, silicon carbide segmentation 5%, fine silica 3%, high-alumina cement adds 10%, Sodium salts humic acids adds 0.2%, and Sodium hexametaphosphate 99 adds 0.15%, 1300～1350 ℃ of firing temperatures. | Casting |
| Embodiment 3 | Corundum aggregate 45%, alumine small-particle 10%, silicon carbide small-particle 10%, zircon sand 5%, alumine fine powder 25%, fine silica 5%, high-alumina cement 4%, Sodium salts humic acids adds 0.02%, and tripoly phosphate sodium STPP adds 0.02%, 1250～1300 ℃ of firing temperatures. | Casting |
| Embodiment 4 | Carborundum aggregate 25%, corundum aggregate 22%, alumine small-particle 10%, zircon sand 5%, alumine fine powder 25%, carbide fine powder 10%, fine silica 3%, aluminum phosphate adds 4%, and oxalic acid adds 2%, 450～500 ℃ of thermal treatment temps | Mechanical pressing |
| Embodiment 5 | Carborundum aggregate 25%, alumine aggregate 10%, corundum aggregate 20%, silicon carbide small-particle 10%, zircon sand 5%, alumine fine powder 25%, fine silica 5%, high-alumina cement adds 8%, and tripoly phosphate sodium STPP adds 0.15%, 1000～1100 ℃ of firing temperatures | Mechanical pressing |
The performance index synopsis of experimental result and other producer's abrasive brick:
| Performance index | Embodiment 1 | Embodiment 2 | Embodiment 3 | Yixing factory patent | U.S. PPC company abrasive brick | Japan SiC composite brick | Silicon carbide based on silicon carbide brick |
| Cold crushing strength MPa | 130 ? | 198 ? | 208 ? | ?96.3 ? | ?34.5～62.1 ? | ?59～64 ? | ?150～250 ? |
| Volume density g/cm 3 | 2.65 ? ? | 2.7 ? ? | 3.1 ? ? | ?2.46 ? ? | ?2.18～2.24 ? ? | ?2.4～2.6 ? ? | ?2.5～2.6 ? ? |
| 1000 degree reheating linear change rate on reheating % | -0.02 ? | -0.03 ? | -0.03 ? | ?-0.02 ? | ?-0.03 ? | ||
| The wear-resisting amount cm of normal temperature 3 | 4.4 ? | 2.8 ? | 2.0 ? | ?10 ? | ?12 ? | ?2.3 ? |
Claims (3)
1, a kind of high-strength antiwear refractory brick is characterized in that pressing the preparation of column weight magnitude batching by the high-temperature flame-proof material:
Particle diameter d is the aggregate 30%～70% of 12mm＞d 〉=1mm
Particle diameter d is the small-particle material 5%～30% of 1mm＞d 〉=0.1mm
Particle diameter d is the fine powder 25%～50% of d＜0.1mm
Aggregate be in three kinds of the alumines, silicon carbide, corundum one or both, three kinds combination; The small-particle material is one or more the combination in silicon carbide, corundum, alumine, the zircon; Fine powder is the combination of heavy two or more of corundum, silicon carbide, alumine, silicon-dioxide, aluminium sesquioxide; The batching China and foreign countries are added with the moulding wedding agent of 0.5%～15% gross weight ratio and the moulding additive of 0.1%～3% gross weight ratio.
2, high-strength antiwear refractory brick according to claim 1 is characterized in that the moulding wedding agent is one or more the combination in bonding clay, refractory cements, phosphoric acid, the aluminum phosphate.
3, high-strength antiwear refractory brick according to claim 1 is characterized in that additive is the combination of heavy one or more of oxalic acid, tripoly phosphate sodium STPP, humic acids, Sodium hexametaphosphate 99.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001112147A CN1155540C (en) | 2000-07-15 | 2000-07-15 | High-strength antiwear refractory brick |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001112147A CN1155540C (en) | 2000-07-15 | 2000-07-15 | High-strength antiwear refractory brick |
Publications (2)
| Publication Number | Publication Date |
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| CN1334257A CN1334257A (en) | 2002-02-06 |
| CN1155540C true CN1155540C (en) | 2004-06-30 |
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| CNB001112147A Expired - Fee Related CN1155540C (en) | 2000-07-15 | 2000-07-15 | High-strength antiwear refractory brick |
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- 2000-07-15 CN CNB001112147A patent/CN1155540C/en not_active Expired - Fee Related
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