CN104003737B - Sialon combined andalusite/SiC composite refractory and preparation method thereof - Google Patents
Sialon combined andalusite/SiC composite refractory and preparation method thereof Download PDFInfo
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- CN104003737B CN104003737B CN201410228821.0A CN201410228821A CN104003737B CN 104003737 B CN104003737 B CN 104003737B CN 201410228821 A CN201410228821 A CN 201410228821A CN 104003737 B CN104003737 B CN 104003737B
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- andaluzite
- powder
- granularity
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- andalusite
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Abstract
The invention discloses a sialon combined andalusite/SiC composite refractory and a preparation method thereof, belonging to the field of a refractory. The sialon combined andalusite/SiC composite refractory comprises andalusite, alpha-Al2O3 powder, polycrystalline silicon waste, and aluminum powder. Dextrin and phenolic resin are used as combining agents. The preparation method comprises the steps: during production, weighing the raw materials in proportion, mixing to obtain a pug; pressing and forming, and sintering in a nitrogen atmosphere of 1200-1500 DEG C. The sialon combined andalusite/SiC composite refractory has excellent physical performance indexes, namely, apparent porosity of 10-18 percent, volume density of 2.5-3.0 g/cm<3>, normal-temperature compression strength of 100-300 MPa, and high temperature bending strength of 20-70 MPa, and has good heat shock resistance, creep resistance and relatively strong CO and alkali steam erosion resistance. The sialon combined andalusite/SiC composite refractory is high in performance-cost ratio by using rich andalusite and polycrystalline silicon waste as raw materials, can be used in middle-upper parts of a large hot blast heater and a blast furnace, and is capable of prolonging the service life of the large hot blast heater and the blast furnace and recycling the polycrystalline silicon waste material.
Description
Technical field
The present invention relates to a kind of large-scale hotblast stove and blast furnace middle and upper part refractory materials used, particularly relate to the match used of a kind of large-scale high wind-warm syndrome, long lifetime hotblast stove and blast furnace middle and upper part grand in conjunction with andaluzite/SiC composite refractory and preparation method.
Background technology
Hotblast stove, as a kind of heat exchanger of heat accumulating type, is the most important attached Thermal Equipment of blast furnace, realizes high yield, low consumption, reduction pig iron cost play vital effect to blast furnace.In recent years, along with the development of China's blast furnace technology, require that hotblast stove must provide sufficiently high wind-warm syndrome (>=1300 DEG C), and have the higher life-span (>=30 years).The refractory materials of current use is that restriction hotblast stove realizes high wind-warm syndrome operation and long-life key factor.The distortion that the damage of refractories for hot blast stove causes primarily of high-temperature machinery load, the cracking that temperature frequent variations causes and peeling off, the erosion etc. of CO, alkali steam.The measure of reply is the high temperature, the normal temperature strength that improve refractory materials, creep resistance, heat-shock resistance, the ability of anti-CO and alkali vapours attack.Therefore, develop and a kind ofly have excellent high temperature, normal temperature strength, creep resistance, the high-quality refractory material of heat-shock resistance and anti-CO, alkali vapours attack is significant and necessity for the working standard improving China's hotblast stove.
Andaluzite has good resistance to elevated temperatures, at high temperature irreversiblely change the mullite that polar expansion is little, foreign matter content is low into, its mullitization process is slow, ensure that the volume stability of goods, show that physical strength is high, heat-shock resistance and good, the anti-CO of creep resistance and the premium properties such as alkali vapours attack ability is strong, heat-shock resistance and anti-CO, alkali vapours attack are required that there is good application prospect in high field.There is abundant andaluzite resource in China, Henan, Xinjiang, Shaanxi, Jilin and Liaoning etc. are economized and all be distributed andaluzite mining area, thus andaluzite price is relatively low compared with the raw materials such as corundum, but compared with developed countries, still there is gap in China in the Application and Development of high-quality andalusite brick.
Sialon be 20th century early seventies found at first by OyamaY. and the Kamagaito O. of Japan and the Jack K.H. of Britain.Sialon pottery, with its superior mechanical property, thermal property and chemical stability, is considered to one of most promising high-temperature structural ceramics.It fire resisting material field be often used as material in conjunction with phase, the hot strength of material, heat-shock resistance, molten-metal-resistant and alkaline residue corrosive power can be improved.Current Sialon combined corundum and Sialon combined silicon carbide material obtain extensive investigation and application.Hong Yanping etc. have prepared Sialon bonded corundum refractories at corundum based refractory materials introducing silica flour and aluminium powder by situ nitridation reaction, improve mechanical property and the heat-shock resistance of goods; What victory equality is with metal fine powder, active additive and silicon carbide for main raw material has synthesized Sialon carborundum refractory material, and performance is obviously better than with clay, oxide compound or Si
3n
4for the silicon carbide products in conjunction with phase, but not yet to have with andaluzite be that main raw material prepares the relevant report of Sialon in conjunction with andaluzite/SiC composite refractory.
In recent years, the energy, information industry are flourish, and the polysilicon market as main raw material also constantly expands thereupon.But polysilicon can use after needing to cut into silicon chip.At cutting process because cutter damages enter cutting slurry by there being the crystalline silicon of 50%-52% to become silicon powder, cause cutting efficiency to reduce, final cutting slip lost efficacy and became slug, caused the wasting of resources and environmental pollution, brought huge pressure to enterprise.Generally adopt at present silicon carbide as cutting abrasive material, therefore cut in slug main containing HIGH-PURITY SILICON, polyoxyethylene glycol (dispersion agent), silicon carbide and a small amount of metal, but silicon and silicon carbide are in physics and chemistry less, the separation difficulty of difference in nature.Therefore, Pure Silicon Metal in cutting waste material how is recycled cost-effectively and silicon carbide is current problem demanding prompt solution.
Summary of the invention
The present invention is intended to the defect overcoming current domestic high wind-warm syndrome, long lifetime hotblast stove and blast furnace middle and upper part refractory materials used, provides a kind of and has that hot strength is high, creep resistance good, the advantage such as anti-CO and alkali vapours attack ability is strong, good thermal shock stability and the low match of abundant raw material source, production cost is grand in conjunction with andaluzite/SiC composite refractory and preparation method.
Technical scheme of the present invention:
The invention provides the match used of a kind of high wind-warm syndrome, long-life type hotblast stove and blast furnace middle and upper part grand in conjunction with andaluzite/SiC composite refractory, by weight percentage, raw material consists of: 5-15% granularity is the andaluzite of 5-3mm, 25-50% granularity is the andaluzite of 3-1mm, 15-35% granularity is 1-0mm andaluzite, 5-30% α-Al
2o
3powder, 5-30% polycrystalline silicon wastes, 0-8% aluminium powder, additional above-mentioned raw materials total amount 1-5% dextrin, 1-6% resol is as bonding agent.
Al in described andaluzite
2o
3>=55%, Fe
2o
3≤ 1.2%, K
2o+Na
2o≤0.5%; Described α-Al
2o
3the granularity of powder is 200 orders, α-Al
2o
3middle Al
2o
3>=98%, Fe
2o
3≤ 0.5%, K
2o+Na
2o≤0.5%; Described polycrystalline silicon wastes granularity is discrete distribution, be between 1um and 240um, mean particle size is 20um ± 10um, in polycrystalline silicon wastes, contents of free si is 25-60%, and carborundum content is 25-60%, and alumina content is 3-7%, metal Fe content is 1-5%, CaO content is less than 0.5%, and it is 0.5-3% that content of MgO is less than 1%, PEG content; The granularity of described aluminium powder is 200 orders, Al>=97% in aluminium powder.
The grand preparation method in conjunction with andaluzite/SiC composite refractory of match that high wind-warm syndrome, long-life type hotblast stove and blast furnace middle and upper part are used, described preparation method comprises the following steps:
A. take various raw material by described proportioning, powder part is carried out premix, do time as 30-60min in advance, it is 1-0mm andaluzite that described powder part comprises granularity, α-Al
2o
3powder, polycrystalline silicon wastes, aluminium powder.
B. first adding granularity is 5-3mm, the andaluzite of 3-1mm, then add 2/3 of the total add-on of the bonding agent formed by dextrin, resol prepared in advance, mixing 1-5min, then the powder and remaining 1/3 bonding agent that obtain through premix in step a is added, remix 5-10min.
C. the mixture obtained by step b is pressed into firebrick billet through friction press or vibration pressure machine.
D. the firebrick billet of forming is put into moisture eliminator 110 ± 10 DEG C of dry 24-48h, control moisture content below 0.5%.
E. dried adobe is imported muffle combustion gas nitrogenize shuttle kiln, burn till in 1200-1500 DEG C of nitrogen atmosphere, final obtained match is grand in conjunction with andaluzite/SiC composite refractory brick.
Compared with prior art, feature of the present invention and positively effect:
1. to utilize Si, Al metal transfer phase technique to prepare match grand in conjunction with andaluzite/SiC composite refractory in the present invention, production technique is simple, identical with traditional Si alon combined corundum refractory materials production technique, special requirement is not proposed to the production unit of refractory materials, enrich with reserves in China simultaneously and develop less andaluzite for raw material, greatly reduce the grand manufacturing cost in conjunction with andaluzite/SiC composite refractory of match, improve the ability of the heat-shock resistance of material and anti-CO, alkali vapours attack.Therefore, product of the present invention is higher than other like product cost performances, is conducive to Rapid Popularization and application.
2. grand the combination in conjunction with Sialon in andaluzite/SiC composite refractory of match that prepared by the present invention is Si-Al-O-N sosoloid mutually, its solid solubility can change within the specific limits, does not affect the grand acquisition in conjunction with andaluzite/SiC refractory material of last match when feed composition slightly changes.Therefore this technique is lower to ingredient requirement, is applicable to industrialization promotion.
3. the match prepared of the present invention is grand in conjunction with the inner mullitization process of andaluzite/SiC composite refractory brick slowly and volume change is little, makes product have fabulous volume stability and stronger heat-shock resistance.
4. product of the present invention using polycrystalline silicon wastes as raw material, abundance, cheap; There is in polycrystalline silicon wastes the metal Si of high reaction activity, Sialon is defined in a nitrogen atmosphere in conjunction with phase with aluminium powder etc., Sialon has that hot strength is high, good thermal shock, molten-metal-resistant and the premium properties such as alkaline residue corrosive power is strong, product of the present invention is made to have than the better hot strength of conventional red pillar refractory materials, heat-shock resistance and alkali resistant slag corrosion ability, not only increase the cost performance of product, under the prerequisite not being separated SiC and Si, achieve again the utilization of polycrystalline silicon wastes, decrease the wasting of resources and environmental pollution.
5. the match prepared of the present invention is grand possesses excellent physical performance index in conjunction with andaluzite/SiC composite refractory.Apparent porosity 10-18%, volume density 2.5-3.0g/cm
3, cold crushing strength 100-300MPa, high temperature break resistant intensity 20-70MPa, there is the ability of good heat-shock resistance, creep resistance and stronger anti-CO, alkali steam corrosion.
6. product of the present invention can make hotblast stove realize high wind-warm syndrome operation, improves lifetime of hot-air stove, thus improves smelting strength of blast furnace and production efficiency, saves the usage quantity of coke and a large amount of upkeep costs, has significant economic and social benefit; Product of the present invention also can be applicable to blast furnace middle and upper part, extends the work-ing life of large blast furnace, is conducive to the target that steel industry realizes high yield and low cost.
Embodiment
Embodiment 1: the match used of a kind of high wind-warm syndrome, long-life type hotblast stove and blast furnace middle and upper part is grand in conjunction with andaluzite/SiC composite refractory and preparation method, by weight percentage, raw material consists of: 8% granularity is the andaluzite of 5-3mm, 37% granularity is the andaluzite of 3-1mm, 25% granularity is 1-0mm andaluzite, 9% α-Al
2o
3powder, 16% polycrystalline silicon wastes, 2.4% aluminium powder, additional above-mentioned raw materials total amount 2.5% dextrin, 1.2% resol are as bonding agent.
Described preparation method comprises the following steps:
A. take various raw material by described proportioning, powder part is carried out premix, do time as 30-60min in advance, it is 1-0mm andaluzite that described powder part comprises granularity, α-Al
2o
3powder, polycrystalline silicon wastes, aluminium powder.
B. first adding granularity is 5-3mm, the andaluzite of 3-1mm, then add 2/3 of the total add-on of the bonding agent formed by dextrin, resol prepared in advance, mixing 1-5min, then the powder and remaining 1/3 bonding agent that obtain through premix in step a is added, remix 5-10min.
C. the mixture obtained by step b is pressed into firebrick billet through friction press or vibration pressure machine.
D. the firebrick billet of forming is put into moisture eliminator 110 DEG C of dry 48h, control moisture content below 0.5%.
E. dried adobe is imported muffle combustion gas nitrogenize shuttle kiln, burn till in 1450 DEG C of nitrogen atmospheres, final obtained Sialon is in conjunction with andaluzite/SiC composite refractory brick.
Products obtained therefrom performance index are: apparent porosity 13%, volume density 2.76g/cm
3, cold crushing strength 195MPa, high temperature break resistant intensity 45MPa, there is the ability of good heat-shock resistance, creep resistance and stronger anti-CO and alkali vapours attack.
Embodiment 2: production technique is identical with embodiment 1, and difference is:
By weight percentage, raw material consists of: 8% granularity is the andaluzite of 5-3mm, and 37% granularity is the andaluzite of 3-1mm, and 25% granularity is 1-0mm andaluzite, 7.5% α-Al
2o
3powder, 18% polycrystalline silicon wastes, 2.4% aluminium powder, additional above-mentioned raw materials total amount 2.5% dextrin, 1.2% resol is as bonding agent.
Products obtained therefrom performance index are: apparent porosity 14%, volume density 2.71g/cm
3, cold crushing strength 180MPa, high temperature break resistant intensity 38MPa, there is the ability of good heat-shock resistance, creep resistance and stronger anti-CO and alkali vapours attack.
Claims (2)
1. a match is grand in conjunction with andaluzite/SiC composite refractory, it is characterized in that: by weight percentage, raw material consists of the andaluzite that 5-15% granularity is 5-3mm, and 25-50% granularity is the andaluzite of 3-1mm, 15-35% granularity is 1-0mm andaluzite, 5-30% α-Al
2o
3powder, 5-30% polycrystalline silicon wastes, 0-8% aluminium powder, additional above-mentioned raw materials total amount 1-5% dextrin, 1-6% resol are as bonding agent; Al in described andaluzite raw material
2o
3>=55%, Fe
2o
3≤ 1.2%, K
2o+Na
2o≤0.5%; Described α-Al
2o
3the granularity of powder is 200 orders, α-Al
2o
3middle Al
2o
3>=98%, Fe
2o
3≤ 0.5%, K
2o+Na
2o≤0.5%; Described polycrystalline silicon wastes granularity is discrete distribution, be between 1um and 240um, mean particle size is 20um ± 10um, in polycrystalline silicon wastes, contents of free si is 25-60%, and carborundum content is 25-60%, and alumina content is 3-7%, metal Fe content is 1-5%, CaO content is less than 0.5%, and it is 0.5-3% that content of MgO is less than 1%, PEG content; The granularity of described aluminium powder is 200 orders, Al>=97% in aluminium powder.
2. the grand preparation method in conjunction with andaluzite/SiC composite refractory of match as claimed in claim 1, is characterized in that: preparation method comprises the following steps:
A. take various raw material by described proportioning, powder part is carried out premix, do time as 30-60min in advance, it is 1-0mm andaluzite that described powder part comprises granularity, α-Al
2o
3powder, polycrystalline silicon wastes, aluminium powder;
B. first adding granularity is 5-3mm, the andaluzite of 3-1mm, then add 2/3 of the total add-on of the bonding agent formed by dextrin, resol prepared in advance, mixing 1-5min, then the powder and remaining 1/3 bonding agent that obtain through premix in step a is added, remix 5-10min;
C. the mixture obtained by step b is pressed into firebrick billet through friction press or vibration pressure machine;
D. the firebrick billet of forming is put into moisture eliminator 110 ± 10 DEG C of dry 24-48h, control moisture content below 0.5%;
E. dried adobe is imported muffle combustion gas nitrogenize shuttle kiln, burn till in 1200-1500 DEG C of nitrogen atmosphere, final obtained match is grand in conjunction with andaluzite-SiC composite refractory brick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410228821.0A CN104003737B (en) | 2014-05-27 | 2014-05-27 | Sialon combined andalusite/SiC composite refractory and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410228821.0A CN104003737B (en) | 2014-05-27 | 2014-05-27 | Sialon combined andalusite/SiC composite refractory and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN104003737A CN104003737A (en) | 2014-08-27 |
| CN104003737B true CN104003737B (en) | 2015-07-01 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105036766A (en) * | 2015-07-04 | 2015-11-11 | 张燕 | Vanadium iron slag-polycrystalline silicon waste refractory castable |
| CN106518101A (en) * | 2016-10-10 | 2017-03-22 | 马鞍山豹龙新型建材有限公司 | Shock resistant refractory brick and preparation method thereof |
| CN110105059B (en) * | 2019-05-17 | 2021-10-29 | 山东工业职业学院 | Brick for hot blast stove with high thermal shock resistance and low creep deformation and manufacturing method thereof |
| CN111138205B (en) * | 2020-02-18 | 2022-04-12 | 中钢洛耐科技股份有限公司 | Preparation method of anti-erosion sialon corundum product |
| CN115636679B (en) * | 2022-11-03 | 2023-08-11 | 中钢洛耐科技股份有限公司 | Sialon corundum mullite for firing electronic ceramic kiln |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5972102A (en) * | 1996-10-29 | 1999-10-26 | North American Refractories Co. | Hydraulically-bonded monolithic refractories containing a calcium oxide-free binder comprised of a hydratable alumina source and magnesium oxide |
| CN101450866A (en) * | 2007-12-04 | 2009-06-10 | 上海宝钢工业检测公司 | Abrasion resistant steel fiber reinforcement pouring precast block for coke dry quenching oven |
| CN102557713A (en) * | 2011-12-27 | 2012-07-11 | 济南圣泉倍进陶瓷过滤器有限公司 | Ceramic foam filter, composition for preparing ceramic foam filter and preparation method for ceramic foam filter |
-
2014
- 2014-05-27 CN CN201410228821.0A patent/CN104003737B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5972102A (en) * | 1996-10-29 | 1999-10-26 | North American Refractories Co. | Hydraulically-bonded monolithic refractories containing a calcium oxide-free binder comprised of a hydratable alumina source and magnesium oxide |
| CN101450866A (en) * | 2007-12-04 | 2009-06-10 | 上海宝钢工业检测公司 | Abrasion resistant steel fiber reinforcement pouring precast block for coke dry quenching oven |
| CN102557713A (en) * | 2011-12-27 | 2012-07-11 | 济南圣泉倍进陶瓷过滤器有限公司 | Ceramic foam filter, composition for preparing ceramic foam filter and preparation method for ceramic foam filter |
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