CN102329143B - Anti-skinning unshaped refractory material made of magnesium aluminate spinel used for cement kiln and preparation method and application of anti-skinning unshaped refractory material - Google Patents
Anti-skinning unshaped refractory material made of magnesium aluminate spinel used for cement kiln and preparation method and application of anti-skinning unshaped refractory material Download PDFInfo
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Abstract
The invention discloses an anti-skinning unshaped refractory material made of magnesium aluminate spinel used for a cement kiln and a preparation method and application of the anti-skinning unshaped refractory material. The anti-skinning unshaped refractory material comprises raw materials as follows: quaternary mixed magnesium aluminate spinel with the particle diameter below 5mm, secondary mixed cordierite with the particle diameter below 3mm, superfine magnesia powder with the particle diameter smaller than 0.02mm, alpha-alumina micropowder with the particle diameter smaller than 0.02mm, silicon micropowder, silicon nitride powder, a high-efficiency water-reducing agent and water. According to the anti-skinning unshaped refractory material disclosed by the invention, with the magnesium aluminate spinel as the main crystalline phase and a superfine magnesia powder-silicon micropowder-silicon nitride powder-water system to substitute a pure calcium aluminate cement bonding agent, a complex-phase structure with the magnesium aluminate spinel as the main crystalline phase and the cordierite as the secondary crystalline phase is formed under high temperature, so that the refractory material has certain high-temperature resistance and good anti-skinning and anti-heat shock performances, can be used as the anti-skinning unshaped refractory material for a novel dry-process cement rotary kiln and a cement presintering production process, and has broad application prospect.
Description
Technical field
The invention belongs to the cement kiln refractory in building material field, particularly relate to a kind of have certain high temperature resistant and excellent resistive connection skin, thermal shock resistance, can be used as the magnesium-aluminium spinel resistive connection skin unshape refractory and preparation method thereof and application of the short flow process pre-fired of cement dry method rotary kiln and energy-saving cement kiln.
Background technology
Along with the progress of cement industry, the new type nonaqueous cement rotary kiln at home and abroad is used widely.Each manufacture of cement producer, according to the national policy of legislations of environmental protection and energy-saving and emission-reduction, more and more uses the solid waste such as building waste, domestic refuse, sewage sludge, industrial residue as raw material and the fuel of producing cement clinker.Thereby various impurity in cement rotary kiln, content as heavy metal ion, sulphur, chlorine, alkali rolls up, through the circulation enrichment of preheater, decomposing furnace, clinkering zone in cement rotary kiln, very easily at kiln tail system, form skinning and stop up, affect the normal operation of cement rotary kiln.
In order to improve cement output, reduce the net effect burn till hear rate and grinding pow consumption, raising clinker quality, China Building Material Scientific Research General Institute has been invented a kind of cement presintering production method and system (publication number: CN101139175) thereof in August, 2007.Solve the skinning problem particularly important to promoting this Technology, because when the kiln tail system temperature during up to 900-1200 ℃, the skinning of cement slurry, blockage problem become more serious.A kind of solution is to purge by air bubble, and another solution is to use resistive connection skin refractory materials, makes it with sulphur chlor-alkali and cement slurry component, not react.Resistive connection skin, the thermal shock resistance that therefore, with the composite refractory material of this complete sets of Techniques, will have certain resistance to elevated temperatures and excellence.
At present, the temperature of new type nonaqueous cement rotary kiln tail system is 800-1000 ℃, and the resistive connection skin refractory materials of use has the refractory materialss such as High-Alumina, silicon carbide., because material in rotary system is alkaline environment, select the refractory materials of basic refractory or neutral meta-alkalescence.SiC based refractories belongs to amphoteric refractory, and thermal shock resistance is fine, but in the cement presintering production technique, when when kiln end temperature, rising to 1200 ℃, its resistance of oxidation descends greatly, the SiO of material surface
2Film starts the reaction with CaO and liquid phase and binding material occur, and anti-scaling property lost efficacy.Therefore, with kiln end temperature, raise, High-Alumina, SiC based refractories will be substituted by other non-chromium alkaline refractory materials.
Magnesia-alumina spinel refractory has excellent resistive connection skin, resistance to elevated temperatures, and hangs down the erosion of basicity kiln material in can resisting well, and its shortcoming is that thermal shock resistance is poor.Ruitai Technology Co., Ltd and China Building Material Scientific Research General Institute have been invented antiskinning castable for magnesium aluminate spinel for cement kiln (publication number: CN101412630) in October, 2008, anti-skinning pouring material for cement kiln (publication number: CN101987793A), effectively supported the development of cement presintering production technique has been invented by Anhui Ruitai New Material Technology Co., Ltd in October, 2010.But 1200 ℃ of high temperature anti-scaling properties of these two kinds of crusting resistant pouring materials are not good enough, and reason is that these two kinds of crusting resistant pouring materials all need to use silicon ash and pure calcium aluminate cement as wedding agent.The SiO that the CaO that cement is brought into, silicon ash are brought into
2React and form eutectic mixture and produce liquid phase at the alkali of circulation enrichment more than 1200 ℃ and in the kiln material, binding material, had a strong impact on the anti-scaling property of material.
In the magnesia fireproof casting material that steel industry generally uses, oxidation magnesium-silicon ash-aqueous systems wedding agent can provide the normal temperature strength of refractory materials., because the group categories of magnesia-alumina spinel refractory and magnesia fireproof casting material seemingly,, therefore can use oxidation magnesium-silicon ash-aqueous systems instead of pure aluminous cement as wedding agent, avoid introducing the calcium oxide impurity of low melting point.And a small amount of magnesium oxide, aluminum oxide and silicon oxide at high temperature can react the low trichroite (2MgO2Al of the Heat of Formation coefficient of expansion
2O
35SiO
2), the heat-shock resistance of raising material.But content of magnesia has influence on again normal temperature strength very little, so can use highly active magnesium oxide ultrafine powder to substitute fine magnesium oxide micro-powder, solves this problem.
Summary of the invention
The purpose of this invention is to provide a kind of cement kiln magnesium-aluminium spinel resistive connection skin unshape refractory.
For solving the problems of the technologies described above, the present invention takes following technical scheme:
A kind of cement kiln magnesium-aluminium spinel resistive connection skin unshape refractory, its raw material comprises the magnesium-aluminium spinel 69-82 weight part that particle diameter coordinates in the following level Four of 5mm, the trichroite 0-20 weight part that particle diameter coordinates in the following two-stage of 3mm, particle diameter is less than the magnesia ultrafine powder 2-4 weight part of 0.02mm, particle diameter is less than the α-aluminum oxide micro mist 6-8 weight part of 0.02mm, silicon ash 1-2 weight part, silicon nitride powder 0-5 weight part, high efficiency water reducing agent 0.05-0.15 weight part and water 4-6 weight part.
This cement kiln magnesium-aluminium spinel resistive connection skin unshape refractory, its composition of raw materials comprises the component of following ratio of weight and number: 1-5mm magnesium-aluminium spinel 46-56 part, 0.088-1mm magnesium-aluminium spinel 10-15 part, 0.02-0.088mm magnesium-aluminium spinel 9-15 part, less than 0.02mm magnesium-aluminium spinel 1-2 part, 0.088-3mm trichroite 0-14 part, less than 0.088mm trichroite 0-9 part, less than 0.02mm magnesia ultrafine powder 2-4 part, less than 0.02mm α-aluminum oxide micro mist 6-8 part, silicon ash 1-2 part, silicon nitride powder 0-5 part, high efficiency water reducing agent 0.05-0.15 part, water 4-6 part.
In above-mentioned formula, described magnesium-aluminium spinel is commercially available fireproof magnesia alumina spinel materials; Described trichroite is commercially available cordierite refractory material; Described magnesia ultrafine powder is that commercially available magnesia product obtains after processing 0.02mm sieves 95% magnesium oxide ultrafine powder down; Described α-aluminum oxide micro mist is commercially available α-aluminum oxide micropowder material; Described silicon ash is commercially available silicon ash products; Described silicon nitride powder is commercially available silicon nitride powder; Described high efficiency water reducing agent can be selected from any one or a few the combination in sulfonate series concrete high-efficiency water reducing agent, polycarboxylic acid series high efficiency water reducing agent, tripoly phosphate sodium STPP high efficiency water reducing agent, Sodium hexametaphosphate 99 high efficiency water reducing agent and the sodium polyacrylate high efficiency water reducing agent of sulfonate series concrete high-efficiency water reducing agent, condensation trimeric cyanamide of commercially available condensation naphthaldehyde.
Described cement kiln, with magnesium-aluminium spinel resistive connection skin unshape refractory, can be prepared into mould material, self-flowing material, Gunning refractory.
The cement kiln provided by the present invention preparation method of magnesium-aluminium spinel resistive connection skin unshape refractory can comprise the following steps:
1) take raw material by above-mentioned formula;
2) raw material is mixed, obtain cement kiln magnesium-aluminium spinel resistive connection skin unshape refractory.
This refractory materials can be made prefabricated section and use or make jointless Integral construction thing, is used for the irregular position that kiln end system of cement kiln can't use amorphous refractory.
Innovative point of the present invention is:
1) this refractory materials, by adopting oxidation magnesium-silicon ash-aqueous systems instead of pure aluminous cement as wedding agent, produces the aquation combination at normal temperatures, avoids introducing the calcium oxide impurity of low melting point;
2), by adopting magnesium oxide ultrafine powder-silicon ash-aqueous systems to substitute common magnesium oxide powder-silicon ash-aqueous systems as wedding agent, improve magnesian hydratability, avoid introducing too much magnesium oxide, hinder the formation of trichroite;
3) in, temperature (700-1000 ℃) is lower generates trichroite by magnesium oxide ultrafine powder, alumina powder and the reaction of silicon ash, produces Ceramic bond, and medium temperature intensity is provided;
4) high temperature (1000-1300 ℃) lower forms take magnesium-aluminium spinel as principal crystalline phase, trichroite is the heterogeneous structure of paracrystalline phase.Wherein, the chemical stability of magnesium-aluminium spinel is fine, with cement kiln material and sulphur chlor-alkali, chemical reaction does not occur, makes the material of developing have excellent resistive connection skin; Trichroite has very low thermal expansivity, makes the material of developing have excellent heat-shock resistance;
5), by further adding little trichroite and the good silicon nitride of thermal conductivity of thermal expansivity, reduce better thermal stresses, improve the heat-shock resistance of material.
Embodiment
For overcoming the shortcoming of existing cement kiln refractory, solve cement kiln refractory non-refractory (1000-1300 ℃), easy skinning, the poor difficult problem of thermal shock resistance in the market, the invention provides a kind of have certain high thermal resistance, excellent resistive connection skin, the cement kiln magnesium-aluminium spinel resistive connection skin unshape refractory of heat-shock resistance.
Cement kiln provided by the present invention, with magnesium-aluminium spinel resistive connection skin unshape refractory, is used for the irregular position of cement kiln, is loose shape material.Its raw material comprises the magnesium-aluminium spinel 69-82 weight part that particle diameter coordinates in the following level Four of 5mm, the trichroite 0-20 weight part that particle diameter coordinates in the following two-stage of 3mm, particle diameter is less than the magnesia 2-4 weight part of 0.02mm, particle diameter is less than the α-aluminum oxide micro mist 6-8 weight part of 0.02mm, silicon ash 1-2 weight part, silicon nitride powder 0-5 weight part, high efficiency water reducing agent 0.05-0.15 weight part and water 4-6 weight part.
Concrete, its composition of raw materials comprises the component of following ratio of weight and number:
1-5mm (referring to more than or equal to 1mm less than 5mm) magnesium-aluminium spinel 46-56 part, (0.088-1mm referring to more than or equal to 0.088mm less than 1mm) magnesium-aluminium spinel 10-15 part, 0.02-0.088mm (referring to more than or equal to 0.02mm less than 0.088mm) magnesium-aluminium spinel 9-15 part, less than 0.02mm magnesium-aluminium spinel 1-2 part; 0.088-3mm (referring to more than or equal to 0.088mm less than 3mm) trichroite 0-14 part, less than 0.088mm trichroite 0-9 part; Less than 0.02mm magnesia ultrafine powder 2-4 part, less than 0.02mm α-aluminum oxide micro mist 6-8 part, silicon ash 1-2 part, silicon nitride powder 0-5 part, high efficiency water reducing agent 0.05-0.15 part, water 4-6 part.
In the statement of size scope of the present invention, lower value contains, and higher limit does not contain.In literary composition, the similar statement implication of rest part is identical.
Perhaps, its composition of raw materials comprises the component of following ratio of weight and number:
1-5mm magnesium-aluminium spinel 46-56 part, 0.088-1mm magnesium-aluminium spinel 10-14 part, 0.02-0.088mm magnesium-aluminium spinel 9-12 part, less than 0.02mm magnesium-aluminium spinel 1-2 part, 0.088-3mm trichroite 0-14 part, less than 0.088mm trichroite 6-9 part, less than 0.02mm magnesia ultrafine powder 2-4 part, less than 6 parts of 0.02mm α-aluminum oxide micro mists, silicon ash 1-2 part, high efficiency water reducing agent 0.05-0.15 part, water 4-5 part.
In above-mentioned formula, described magnesium-aluminium spinel is commercially available fireproof magnesia alumina spinel materials.Adopt the magnesium-aluminium spinel of different-grain diameter to be used in conjunction with, make between material granule and make closestpacking, improve the alkali resistant aggressiveness of material.
Described trichroite is commercially available cordierite refractory material (natural or artificial).Adopt the trichroite of different-grain diameter, better reduce thermal stresses, improve the heat-shock resistance of material.
Described magnesia ultrafine powder is that commercially available magnesia product obtains after processing 0.02mm sieves 95% magnesium oxide ultrafine powder down.Produce combination with silicon ash and water reaction at normal temperatures, the normal temperature strength of material is provided; Middle temperature (700-1000 ℃) is lower generates trichroite (zeopan 2MgO2Al by magnesium oxide ultrafine powder, alumina powder and the reaction of silicon ash
2O
35SiO
2), produce Ceramic bond, medium temperature intensity is provided.
Described α-aluminum oxide micro mist is commercially available α-aluminum oxide micropowder material.Generate magnesium-aluminium spinel with the magnesia original position under middle high temperature, absorb free magnesium.
Described silicon ash is commercially available silicon ash products.Produce combination with magnesia ultrafine powder and water reaction at normal temperatures, the normal temperature strength of material is provided, at high temperature with the magnesium-aluminium spinel reaction, generate trichroite, produce Ceramic bond, the hot strength of material is provided.
Described silicon nitride powder is commercially available silicon nitride powder.Because the thermal conductivity of silicon nitride is good, can improve the heat-shock resistance of material, at high temperature be oxidized in addition silicon-dioxide, generate trichroite with the magnesium-aluminium spinel reaction, produce Ceramic bond, the hot strength of material is provided.
Described high efficiency water reducing agent can be selected from any one or a few the combination in sulfonate series concrete high-efficiency water reducing agent (WRA-1), polycarboxylic acid series high efficiency water reducing agent (WRA-2), tripoly phosphate sodium STPP high efficiency water reducing agent, Sodium hexametaphosphate 99 high efficiency water reducing agent and the sodium polyacrylate high efficiency water reducing agent (WRA-3) of sulfonate series concrete high-efficiency water reducing agent, condensation trimeric cyanamide of commercially available condensation naphthaldehyde.Its effect is to reduce amount of water, improves the normal temperature strength of material, reduces the apparent porosity of material.
Embodiment implements under take technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
In following embodiment, method therefor is ordinary method if no special instructions.
Preparation and the detection of magnesium-aluminium spinel resistive connection skin unshape refractory of embodiment 1-3, cement kiln
One, the cement kiln preparation of magnesium-aluminium spinel resistive connection skin unshape refractory
Embodiment of the present invention 1-3 cement kiln is as shown in table 1 with the formula of magnesium-aluminium spinel resistive connection skin unshape refractory:
The table 1 cement kiln formula (unit: kilogram) of magnesium-aluminium spinel resistive connection skin unshape refractory
The cement kiln of the embodiment 1-3 preparation method of magnesium-aluminium spinel resistive connection skin unshape refractory comprises the following steps:
1) take raw material by formula shown in table 1;
2) raw material is mixed, obtain cement kiln magnesium-aluminium spinel resistive connection skin unshape refractory.
Two, the cement kiln Performance Detection of magnesium-aluminium spinel resistive connection skin unshape refractory
detect the folding strength (according to refractory materials strength at normal temperature test method GB/T3001-2007) of the cement kiln of embodiment 1-3 preparation with magnesium-aluminium spinel resistive connection skin unshape refractory, compressive strength (according to refractory materials cold crushing strength test method GB/T5072-2008), with the cement slurry that the contains alkali resistive connection skin (splitting tensile test that proposes in foundation " measuring the research of cement tensile strength with split the law " at high temperature, between test block of the same race and skinning material the resistive connection skin represent with tensile splitting strength, the low explanation of intensity level resistive connection skin is good, vice versa), burning line changes (according to refractory materials heating permanent line, changing test method GB/T5988-2007) and the remaining folding strength conservation rate (the thermal shock fatigue test that proposes according to " research that the fatigue behaviour of refractory materials anti-thermal shock is estimated ") after thermal shock fatigue test 10 times is air-cooled, simultaneously with commercially available cement kiln unshape refractory (the high-strength Alkali resistant castable refractory of 13NL, the 50S crusting resistant pouring material) be contrast.
Detected result is as shown in table 2, and detected result shows that product of the present invention contrasts and have good manufacturing property that (after shaping, slurry condensed in 0.5 hour, solidified in 6 hours, can the demoulding after 12 hours.110 ℃ of folding strengths reach 10MPa, and 110 ℃ of compressive strengths arrive 50MPa, all meet construction requirement.) and excellent high temperature resistant, anti-scaling property (1100 ℃ and 1400 ℃ of compressive strengths are all more than 100MPa, and burning line changes less than 0.2%, illustrates that high-temperature physical property is good; But the tensile splitting strength of 1200 ℃ of skinning test blocks of 13NL and 50S is higher, is more than 4 times of this product average, and the anti-scaling property of the anti-scaling property of contrast not as this product is described.), by adding the mineral such as trichroite, silicon nitride, greatly improved the thermal shock resistance (in 1100 ℃ of thermal shock fatigue tests, 10 air-cooled remaining folding strength conservation rates of this material reach more than 90%, surpass that 13NL is nearly 30%, 50S nearly 8%) of magnesia-aluminum spinel composite fire-resistant material goods.Consider property indices, illustrate that product of the present invention is better than contrast.
The table 2 embodiment 1-3 cement kiln performance test results of magnesium-aluminium spinel resistive connection skin unshape refractory
Annotate: 1300 ℃ of the high-strength Alkali resistant castable refractory maximum operation (service) temperatures of 13NL, burnt in the time of 1400 ℃.
Comprehensive, refractory materials of the present invention is take magnesium-aluminium spinel as principal crystalline phase, with magnesium oxide ultrafine powder-silicon ash-aqueous systems instead of pure aluminous cement wedding agent, produce aquation by highly active magnesium oxide ultrafine powder and the reaction of silicon achromachia unboiled water at normal temperatures and be combined, reduced the acquisition normal temperature strength to magnesian demand.Middle temperature (700-1000 ℃) is lower produces Ceramic bond by magnesium oxide ultrafine powder, alumina powder and silicon ash reaction generation trichroite, and medium temperature intensity is provided.High temperature (1000-1300 ℃) is lower to be formed take magnesium-aluminium spinel as principal crystalline phase, trichroite is the heterogeneous structure of paracrystalline phase.Thereby make this kind refractory materials have certain high temperature resistant and excellent resistive connection skin, thermal shock resistance, can be used as the resistive connection skin unshape refractory of novel concrete dry-process rotory kiln and cement presintering production technique.
Claims (7)
1. a cement kiln is with magnesium-aluminium spinel resistive connection skin unshape refractory, and it is characterized in that: its raw material comprises the component of following ratio of weight and number:
1-5mm magnesium-aluminium spinel 46-56 part,
0.088-1mm magnesium-aluminium spinel 10-14 part,
0.02-0.088mm magnesium-aluminium spinel 9-12 part,
Less than 0.02mm magnesium-aluminium spinel 1-2 part,
0.088-3mm trichroite 0-14 part,
Less than 0.088mm trichroite 6-9 part,
Less than 0.02mm magnesia ultrafine powder 2-4 part,
Less than 6 parts of 0.02mm α-aluminum oxide micro mists,
Silicon ash 1-2 part,
High efficiency water reducing agent 0.05-0.15 part,
Water 4-5 part.
2. cement kiln according to claim 1 is with magnesium-aluminium spinel resistive connection skin unshape refractory, and it is characterized in that: its composition of raw materials comprises the component of following ratio of weight and number:
56 parts of 1-5mm magnesium-aluminium spinels,
0.088-1mm 14 parts of magnesium-aluminium spinels,
0.02-0.088mm 9 parts of magnesium-aluminium spinels,
Less than 2 parts of 0.02mm magnesium-aluminium spinels,
Less than 9 parts of 0.088mm trichroites,
Less than 2 parts of 0.02mm magnesia ultrafine powders,
Less than 6 parts of 0.02mm α-aluminum oxide micro mists,
2 parts of silicon ashes,
0.05 part of high efficiency water reducing agent,
5 parts, water.
3. cement kiln according to claim 1 is with magnesium-aluminium spinel resistive connection skin unshape refractory, and it is characterized in that: its composition of raw materials comprises the component of following ratio of weight and number:
46 parts of 1-5mm magnesium-aluminium spinels,
0.088-1mm 10 parts of magnesium-aluminium spinels,
0.02-0.088mm 12 parts of magnesium-aluminium spinels,
Less than 1 part of 0.02mm magnesium-aluminium spinel,
0.088-3mm 14 parts of trichroites,
Less than 6 parts of 0.088mm trichroites,
Less than 4 parts of 0.02mm magnesia ultrafine powders,
Less than 6 parts of 0.02mm α-aluminum oxide micro mists,
1 part of silicon ash,
0.15 part of high efficiency water reducing agent,
4 parts, water.
4. cement kiln according to claim 1 is with magnesium-aluminium spinel resistive connection skin unshape refractory, and it is characterized in that: described magnesium-aluminium spinel is commercially available fireproof magnesia alumina spinel materials;
Described trichroite is commercially available cordierite refractory material;
Described magnesia ultrafine powder is that commercially available magnesia product obtains after processing 0.02mm sieves 95% magnesium oxide ultrafine powder down;
Described α-aluminum oxide micro mist is commercially available α-aluminum oxide micropowder material;
Described silicon ash is commercially available silicon ash products;
Described high efficiency water reducing agent is selected from any one or a few the combination in sulfonate series concrete high-efficiency water reducing agent, polycarboxylic acid series high efficiency water reducing agent, tripoly phosphate sodium STPP high efficiency water reducing agent, Sodium hexametaphosphate 99 high efficiency water reducing agent and the sodium polyacrylate high efficiency water reducing agent of sulfonate series concrete high-efficiency water reducing agent, condensation trimeric cyanamide of commercially available condensation naphthaldehyde.
5. according to claim 1 and 2 or 3 described cement kilns are with magnesium-aluminium spinel resistive connection skin unshape refractories, it is characterized in that: described cement kiln is unshape refractory with magnesium-aluminium spinel resistive connection skin refractory materials, can be prepared into mould material, self-flowing material, Gunning refractory.
6. one kind prepares the method for the arbitrary described cement kiln of claim 1 to 5 with magnesium-aluminium spinel resistive connection skin unshape refractory, comprises the following steps:
1) take raw material by formula;
2) raw material is mixed, obtain cement kiln magnesium-aluminium spinel resistive connection skin amorphous refractory.
7. the arbitrary described cement kiln of claim 1 to 5 application of magnesium-aluminium spinel resistive connection skin unshape refractory in making prefabricated section or jointless Integral construction thing, described prefabricated section or jointless Integral construction thing are used for the irregular position that kiln end system of cement kiln can't use amorphous refractory.
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| CN102850044B (en) * | 2012-09-24 | 2014-02-26 | 武汉科技大学 | Light cordierite-spinel castable and preparation method thereof |
| CN105294126B (en) * | 2015-11-19 | 2017-09-01 | 长兴兴鹰新型耐火建材有限公司 | A kind of cement kiln resistive connection skin abrasion-resistant prefabricated brick |
| CN106747528B (en) * | 2017-03-10 | 2020-08-28 | 天津纳诺泰克科技有限公司 | Anti-nodulation and aluminum liquid pollution-proof magnesium aluminate spinel castable for aluminum industry |
| CN107793165A (en) * | 2017-12-02 | 2018-03-13 | 芜湖乾凯材料科技有限公司 | A kind of anti-erosion cement kiln clinkering zone refractory brick and preparation method thereof |
| CN109912312B (en) * | 2019-04-25 | 2022-05-24 | 郑州金世耐火材料有限公司 | Anti-erosion refractory castable |
| CN113636847B (en) * | 2020-05-11 | 2022-09-09 | 北京建筑材料科学研究总院有限公司 | Method for evaluating anti-skinning performance of high-temperature-resistant material for cement kiln |
| CN111978077A (en) * | 2020-08-05 | 2020-11-24 | 河南好运祥耐材有限公司 | Cordierite-containing composite refractory material for dry quenching coke tank and bin body working lining |
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