CN114478038A - Alkali-corrosion-resistant refractory material for rotary tube of glass kiln tube drawing machine and preparation method thereof - Google Patents
Alkali-corrosion-resistant refractory material for rotary tube of glass kiln tube drawing machine and preparation method thereof Download PDFInfo
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- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
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- C04B2235/3427—Silicates other than clay, e.g. water glass
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
- C04B2235/9692—Acid, alkali or halogen resistance
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Abstract
The invention relates to an alkali-corrosion-resistant refractory material for a rotary tube of a glass kiln tube drawing machine, which is prepared by using high-purity mullite, sillimanite, andalusite and combined clay as raw materials through mixing, cold isostatic pressing and high-temperature heat treatment. By selecting raw materials with different particle sizes and different chemical compositions, the alkali-resistant refractory material for the rotary pipe, which contains sillimanite minerals and determines the content of alumina, can be formed. The alkali-resistant refractory material for the rotary tube can resist the corrosion of alkali oxides in molten glass, is not easy to generate low-melting substances to pollute the molten glass, and is favorable for improving the yield of glass tube products.
Description
Technical Field
The invention relates to the technical field of inorganic non-metallic materials, in particular to an alkali-corrosion-resistant refractory material for a rotary tube of a tube drawing machine of a glass kiln and a preparation method thereof, and belongs to the technical branch of refractory materials.
Background
The rotary tube is the most main part of a glass tube drawing system, the rotary tube of the glass furnace is made of an aluminum-silicon refractory material commonly used at present, the types of the preparation raw materials are various, the components of the obtained rotary tube are different from the content of alumina in the rotary tube, the quality of the rotary tube directly influences the yield and the quality of the glass tube, and the overall value and the benefit of the glass melting furnace are also directly influenced. At present, the materials for the rotary tube of the glass tube drawing machine are mainly aluminum-silicon refractory materials, and the main phase of the rotary tube is mullite and a small amount of sillimanite minerals, corundum, quartz and amorphous phase. When the rotating tube is used, the corundum is subjected to crystal phase transformation when meeting the alkaline oxide, and volume expansion is initiated to cause the substrate to be loose; mullite, quartz, amorphous phase and sodium and boron oxides in the glass liquid react to generate low-melting-point albite and the like. The phenomenon that low-melting substances generated in the working process fall into molten glass can be caused, flaws in the glass tube are formed, and the yield of products is reduced.
Among various performance indexes of the refractory material for the rotary pipe, the alkali corrosion resistance is a main index thereof. When the rotating pipe with good alkali corrosion resistance is used, low-melting substances can be reduced or avoided being thrown into molten glass, the molten glass is not easily polluted, and the product yield is high. The alkali corrosion resistance of the refractory for rotary tubes depends on the amount of alumina contained therein, and the kind and content of the sillimanite group minerals. The different content of alumina in the refractory material inevitably causes the change of the phase and the content of the alumina, and the reaction degree of the alumina and the oxides of sodium and boron in the glass liquid is different; the sillimanite group minerals contained in the material have different degrees of mullite behavior in the heat treatment process, and the formed components and structures can also influence the alkali corrosion resistance of the material.
At present, the refractory material products for the rotating tube provided by manufacturers at home and abroad have various mineral compositions, and the content fluctuation range of alumina is very large and covers 55-80 percent. The reasonable alumina content range in the rotating tube material is determined by selecting mullite and sillimanite group mineral raw materials with different granularities and different alumina contents so as to obtain the optimal erosion resistance. The main improvement of the prior art rotary tube is mainly the invention patent designed for the structure thereof, and the research related to the anti-erosion rotary tube is blank.
Disclosure of Invention
The invention aims to provide an alkali-resistant refractory material for a rotary tube of a tube drawing machine of a glass kiln, which can resist the corrosion of alkaline solution, is not easy to generate low-melting substances to pollute glass liquid and is suitable for the rotary tube of the tube drawing machine of the glass kiln.
Specifically, the preparation method of the alkali corrosion resistant refractory material for the rotary tube of the glass kiln tube drawing machine comprises the following steps:
1) mixing 20-30 wt% of high-purity sintered mullite, 15-25 wt% of fused mullite, 0-15 wt% of sillimanite, 10-30 wt% of andalusite and 8-15 wt% of combined clay;
2) the raw materials are dry-mixed for 5-10 minutes in a stirring pot, then a binding agent accounting for 2-5 wt% of the total amount of the raw materials is added, and wet-mixed for 10-15 minutes in a wet mill to obtain a blank;
3) and (3) carrying out cold isostatic pressing on the blank, drying the blank, placing the dried blank in an electric furnace, carrying out heat treatment at 1500-1550 ℃, cooling and taking out.
Preferably, the main chemical component of the high-purity sintered mullite is Al2O3： 65～75wt％，SiO2: 25-30 wt%, the granularity is 1-0.2mm, 0.2-0mm, less than or equal to 0.074mm and less than or equal to 0.044mm respectively.
Preferably, the main chemical component of the electrofused mullite is Al2O3：65～75wt％， SiO2: 25-30 wt%, and the granularity is 0.2-0mm, less than or equal to 0.074mm and less than or equal to 0.044 mm.
Preferably, the main chemical component of the sillimanite is Al2O3：56～60wt％，SiO2: 35-44 wt% and the granularity is less than or equal to 0.074 mm.
Preferably, the main chemical component of andalusite is Al2O3：56～62wt％，SiO2: 36 to 42 weight percent of the total weight, the granularity of 0.2 to 0mm and less than or equal to 0.074 mm.
Preferably, the main chemical component of the bonding clay is Al2O3：30～40wt％，SiO2: 45-60 wt% and the granularity is less than or equal to 0.044 mm.
Preferably, the binding agent in step 2) is a polyvinyl alcohol aqueous solution with a concentration of 1.0%.
Preferably, the forming pressure in the step 3) is 200MPa, the drying temperature is 110 ℃, and the drying time is 48 h.
Preferably, the heat treatment time in step 3) is 6 h.
The invention also relates to the alkali corrosion resistant refractory material for the rotary tube of the glass kiln tube drawing machine, which is prepared by the preparation method.
The invention relates to an alkali corrosion resistant refractory material for a rotating tube of a glass kiln tube drawing machine, which is mainly characterized in that high-purity mullite, sillimanite, andalusite and combined clay are used as raw materials, and the alkali corrosion resistant refractory material is prepared by mixing, cold isostatic pressing and high-temperature heat treatment. By selecting raw materials with different particle sizes and different chemical compositions, the alkali-resistant refractory material for the rotary pipe, which contains sillimanite minerals and determines the content of alumina, can be formed. The alkali-resistant refractory material for the rotating tube can resist the corrosion of alkali oxides in molten glass, is not easy to generate low-melting substances to pollute the molten glass, and is favorable for improving the yield of glass tube products.
The alkali corrosion resistant refractory material for the rotary tube of the glass kiln tube drawing machine, which is prepared by the invention, is detected as follows: the bulk density is 2.55-2.66 g/cm3The apparent porosity is 20-24%; after 48h of the embedded part method alkali etching experiment, the sample is not corroded and damaged by naked eyes.
Detailed Description
Example 1:
the alkali-resistant refractory material for the rotary tube of the glass kiln tube drawing machine is prepared by material preparation, dry mixing, wet mixing, cold isostatic pressing and heat treatment, and the used raw materials consist of 30 wt% of high-purity sintered mullite, 15 wt% of fused mullite, 15 wt% of sillimanite, 30 wt% of andalusite and 10 wt% of combined clay. The raw materials are dry-mixed in a stirring pot for 8 minutes, then polyvinyl alcohol aqueous solution accounting for 3 wt% of the total amount of the raw materials is added, and wet mixing is carried out in a wet mill for 15 minutes to obtain a blank. And (3) performing cold isostatic pressing at 200MPa, drying the blank at 110 ℃ for 48h, placing the dried blank in an electric furnace, performing heat treatment at 1500 ℃ for 6h, cooling, and taking out to obtain the refractory material for the rotating tube. And (3) detecting to obtain: the bulk density is 2.60g/cm3The apparent porosity is 23%; after 48h of the embedded part method alkali etching test, the sample is not corroded and damaged by naked eyes.
Example 2:
anti-friction for rotary tube of glass kiln tube drawing machineThe alkali-etched refractory material is prepared by material mixing, dry mixing, wet mixing, cold isostatic pressing and heat treatment, and the used raw materials consist of 30 wt% of high-purity sintered mullite, 20 wt% of fused mullite, 10 wt% of sillimanite, 30 wt% of andalusite and 10 wt% of combined clay. The raw materials are dry-mixed in a stirring pot for 7 minutes, then polyvinyl alcohol aqueous solution accounting for 3 wt% of the total amount of the raw materials is added, and wet mixing is carried out in a wet mill for 12 minutes to obtain a blank. And (3) performing cold isostatic pressing at 200MPa, drying the blank at 110 ℃ for 48 hours, placing the dried blank in an electric furnace, performing heat treatment at 1500 ℃ for 6 hours, cooling, and taking out to obtain the refractory material for the rotating tube. And (3) detecting to obtain: the bulk density is 2.61g/cm3The apparent porosity is 23%; after 48h of the embedded part method alkali etching test, the sample is not corroded and damaged by naked eyes.
Example 3:
an alkali-resistant refractory material for the rotary tube of tube drawing machine for glass kiln is prepared from high-purity sintered mullite (30 wt.%), electrically fused mullite (20 wt.%), sillimanite (10 wt.%), andalusite (27 wt.%) and clay (13 wt.%) through proportioning, dry mixing, wet mixing, cold isostatic pressing and heat treatment. The raw materials are dry-mixed in a stirring pot for 8 minutes, then polyvinyl alcohol aqueous solution accounting for 5 wt% of the total amount of the raw materials is added, and wet mixing is carried out in a wet mill for 12 minutes to obtain a blank. And (3) performing cold isostatic pressing at 200MPa, drying the blank at 110 ℃ for 48 hours, placing the dried blank in an electric furnace, performing heat treatment at 1500 ℃ for 6 hours, cooling, and taking out to obtain the refractory material for the rotating tube. And (3) detecting to obtain: the bulk density is 2.64g/cm3Apparent porosity 21%; after 48h of the embedded part method alkali etching test, the sample is not corroded and damaged by naked eyes.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A preparation method of an alkali corrosion resistant refractory material for a rotary tube of a tube drawing machine of a glass kiln is characterized by comprising the following steps:
1) mixing 20-30 wt% of high-purity sintered mullite, 15-25 wt% of fused mullite, 0-15 wt% of sillimanite, 10-30 wt% of andalusite and 8-15 wt% of combined clay;
2) the raw materials are dry-mixed for 5-10 minutes in a stirring pot, then a binding agent accounting for 2-5 wt% of the total amount of the raw materials is added, and wet mixing is carried out in a wet mill for 10-15 minutes to obtain a blank;
3) and (3) carrying out cold isostatic pressing on the blank, drying the blank, placing the dried blank in an electric furnace, carrying out heat treatment at 1500-1550 ℃, cooling and taking out.
2. The method according to claim 1, wherein the main chemical component of the high-purity sintered mullite is Al2O3：65～75wt％，SiO2: 25-30 wt%, the granularity is 1-0.2mm, 0.2-0mm, less than or equal to 0.074mm and less than or equal to 0.044mm respectively.
3. The method according to claim 1, wherein the primary chemical component of the electrofused mullite is Al2O3：65～75wt％，SiO2: 25-30 wt%, and the granularity is 0.2-0mm, less than or equal to 0.074mm and less than or equal to 0.044 mm.
4. The method of claim 1, wherein the sillimanite has a chemical composition of Al as a main component2O3：56～60wt％，SiO2: 35-44 wt% and the granularity is less than or equal to 0.074 mm.
5. The method according to claim 1, wherein the andalusite has a main chemical component of Al2O3：56～62wt％，SiO2: 36 to 42 weight percent of the total weight, the granularity of 0.2 to 0mm and less than or equal to 0.074 mm.
6. The method of claim 1, wherein the main chemical component of the bound clay is Al2O3：30～40wt％，SiO2: 45-60 wt% and the granularity is less than or equal to 0.044 mm.
7. The method according to claim 1, wherein the binder in step 2) is an aqueous solution of polyvinyl alcohol with a concentration of 1.0%.
8. The process according to claim 1, wherein the molding pressure in step 3) is 200MPa, the drying temperature is 110 ℃ and the drying time is 48 hours.
9. The method according to claim 1, wherein the heat treatment time in step 3) is 6 hours.
10. The alkali-resistant refractory for rotary tubes of glass tube drawing machines produced by the production method according to any one of claims 1 to 9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114988894A (en) * | 2022-06-07 | 2022-09-02 | 湖南旗滨医药材料科技有限公司 | Light thermal shock-resistant mullite cordierite rotary tube and preparation method thereof |
| CN115448709A (en) * | 2022-10-21 | 2022-12-09 | 湖南旗滨医药材料科技有限公司 | Anti-erosion rotating pipe for glass kiln pipe drawing machine and preparation method thereof |
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| CN103771878A (en) * | 2013-12-02 | 2014-05-07 | 淄博嘉环耐火材料有限公司 | Preparation method of andalusite brick |
| CN105418088A (en) * | 2015-11-24 | 2016-03-23 | 怀宁县凉亭建材有限责任公司 | Preparing method for heat-shock-resisting firebricks |
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| CN103771878A (en) * | 2013-12-02 | 2014-05-07 | 淄博嘉环耐火材料有限公司 | Preparation method of andalusite brick |
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| CN108727045A (en) * | 2018-06-26 | 2018-11-02 | 湖南湘钢瑞泰科技有限公司 | A kind of hot air duct junctions modular tile and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114988894A (en) * | 2022-06-07 | 2022-09-02 | 湖南旗滨医药材料科技有限公司 | Light thermal shock-resistant mullite cordierite rotary tube and preparation method thereof |
| CN115448709A (en) * | 2022-10-21 | 2022-12-09 | 湖南旗滨医药材料科技有限公司 | Anti-erosion rotating pipe for glass kiln pipe drawing machine and preparation method thereof |
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Inventor after: Ye Canjing Inventor after: Liang Xiao Inventor before: Ye Canjing Inventor before: Wang Bingbing Inventor before: An Dong Inventor before: Cao Xuehong Inventor before: Zhang Mengjie Inventor before: Liang Xiao |