CN111233497A - Method for synthesizing cordierite refractory raw material by solid-phase reaction sintering method - Google Patents
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Abstract
The invention relates to a method for synthesizing a cordierite refractory raw material by a solid-phase reaction sintering method, which takes clay, talcum powder, flint clay powder and alumina which have wide sources and low cost as raw materials and prepares the cordierite refractory raw material by mixing, drying, grinding, molding and firing. The cordierite refractory raw material prepared by the method has a low thermal expansion coefficient, and the refractory material prepared from the refractory raw material has good thermal shock resistance stability.
Description
Technical Field
The invention relates to the field of inorganic chemical industry, in particular to a method for synthesizing a cordierite refractory raw material by a solid-phase reaction sintering method.
Background
Cordierite has many excellent properties, especially its low thermal expansion coefficient, excellent thermal shock stability and excellent mechanical properties, making cordierite an ideal raw material for many thermal furnaces and thermal equipment. However, natural cordierite is relatively dispersed and distributed in many metamorphic rocks, magma rocks and pegmatite, generally has a low content and is rarely enriched in minerals, so that direct utilization of natural cordierite as an industrial raw material still faces a certain difficulty, and thus manual synthesis of cordierite from different approaches is required.
Many researchers at home and abroad have conducted a great deal of research on methods for synthesizing cordierite, such as a sol-gel method, a glass crystallization method, and a solid-phase reaction method. In contrast, the sol-gel method can reduce the synthesis temperature appropriately, but the synthesis purity is difficult to control; the glass crystallization method can obtain high-purity cordierite powder under the low-temperature condition, but the operation process is more complicated, the cost is high, and the industrialization is not facilitated; the solid phase reaction method has the simplest operation and the lowest cost, and is most suitable for large-scale industrial production. The common raw materials for synthesizing cordierite through solid-phase reaction comprise high-purity oxide and natural minerals, the synthesis temperature for synthesizing cordierite from high-purity oxide chemical raw materials is lower, the purity of the product is higher, but the cost is higher, and the method is not beneficial to large-scale industrial production; the cordierite synthesized by using natural minerals has low cost and is suitable for industrial production, but the thermal expansion coefficient is high, so that the thermal shock stability of the product is reduced.
Therefore, a preparation method for synthesizing a cordierite refractory raw material by a solid-phase reaction sintering method is urgently needed in the market, and the method not only can have low cost, but also can reduce the thermal expansion coefficient of the material. Therefore, the invention effectively utilizes natural minerals as raw materials, synthesizes the cordierite refractory raw material by a solid phase reaction method, reduces the production cost and the thermal expansion coefficient of the material, and realizes large-scale industrial production.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and aims to provide a method for synthesizing cordierite refractory raw material by a solid-phase reaction sintering method.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for synthesizing a cordierite refractory raw material by a solid-phase reaction sintering method is characterized in that clay, talcum powder, flint clay powder and alumina are combined as raw materials, and the raw materials are subjected to mixing, drying, grinding, forming and sintering to obtain the cordierite refractory raw material synthesized by the solid-phase reaction sintering method, and the method comprises the following specific operation steps:
(1) mixing materials, namely putting 10-15% of bonding clay, 35-45% of talcum powder, 25-35% of flint clay and 5-20% of alumina together in a ball milling tank in percentage by mass, and grinding for 24 hours by taking absolute ethyl alcohol as a grinding medium to obtain cordierite refractory raw material slurry;
(2) drying, namely drying the ball-milled cordierite refractory raw material slurry at 90-120 ℃ for 10-12h to obtain a dried cordierite refractory raw material;
(3) grinding, namely grinding the dried cordierite refractory raw material to be below 150 meshes to obtain dried cordierite refractory raw material fine powder;
(4) molding, namely molding the dried cordierite refractory raw material fine powder by dry pressing at 4-6MPa to obtain a cordierite refractory raw material green body;
(5) and (3) firing, namely firing the cordierite refractory raw material blank in a 1300-plus-1450 ℃ high-temperature furnace, preserving the temperature for 3-6h, naturally cooling along with the furnace, and then taking out to obtain the cordierite refractory raw material.
The particle sizes of the combined clay, the talcum powder, the flint clay powder and the alumina in the step (1) are all less than 0.088 mm; al in the bonding clay2O3Content 28.29wt.%, SiO2Content 56.81 wt.%; SiO in the talc252.64wt.% MgO content, 31.74 wt.%; al in the flint clay2O3Content 42.65wt.%, SiO2Content 52.74 wt.%; al in the alumina2O3Content 81.12 wt.%; SiO 22The content was 11.79 wt.%.
Compared with the prior art, the invention has the beneficial effects that: 1) the raw materials used by the method are all natural minerals and have wide sources; 2) the materials are mixed by using a ball mill, so that the mutual distribution of the materials is more uniform, the particle size is smaller, the conversion from a middle phase to cordierite is greatly promoted, the content of a main crystal phase (cordierite phase) is increased, and the cordierite refractory raw material with a lower thermal expansion coefficient is obtained.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The preparation process of the present invention is further illustrated by the following examples:
example 1:
11kg of bonding clay with the granularity of less than 0.088mm, 40kg of talcum powder, 30kg of flint clay and 19kg of alumina are placed in a ball milling tank together, and are ground for 24 hours by taking absolute ethyl alcohol as a grinding medium to obtain cordierite refractory raw material slurry; drying the ball-milled cordierite refractory raw material slurry at 110 ℃ for 12h to obtain a dried cordierite refractory raw material; grinding the dried cordierite refractory raw material to be below 150 meshes to obtain dried cordierite refractory raw material fine powder; dry pressing and molding the dried cordierite refractory raw material fine powder at 5MPa to obtain a cordierite refractory raw material green body; and calcining the cordierite refractory raw material blank in a 1330 ℃ high-temperature furnace, preserving the heat for 6 hours, naturally cooling along with the furnace, and taking out to obtain the cordierite refractory raw material.
Measuring the volume density and the apparent porosity of the sample according to GB/T2997-2000; the samples were chemically analyzed as in GB/T32179-2015. The cordierite refractory raw material synthesized by the method of this example had a bulk density of 1.96g/cm3The apparent porosity was 24.2%, and the thermal expansion coefficient was 1.8X 10-6℃-1The cordierite content was 73%.
Example 2:
placing 15kg of bonding clay with the granularity of less than 0.088mm, 38kg of talcum powder, 33kg of flint clay and 14kg of alumina in a ball milling tank together, and grinding for 24 hours by taking absolute ethyl alcohol as a grinding medium to obtain cordierite refractory raw material slurry; drying the ball-milled cordierite refractory raw material slurry at 110 ℃ for 12h to obtain a dried cordierite refractory raw material; grinding the dried cordierite refractory raw material to be below 150 meshes to obtain dried cordierite refractory raw material fine powder; dry pressing and molding the dried cordierite refractory raw material fine powder at 5MPa to obtain a cordierite refractory raw material green body; and calcining the cordierite refractory raw material blank in a 1330 ℃ high-temperature furnace, preserving the heat for 6 hours, naturally cooling along with the furnace, and taking out to obtain the cordierite refractory raw material.
Measuring the volume density and the apparent porosity of the sample according to GB/T2997-2000; samples were tested according to GB/T32179-And (4) chemical analysis. The cordierite refractory raw material synthesized by the method of this example had a bulk density of 2.13g/cm3The apparent porosity was 23.5%, and the thermal expansion coefficient was 1.6X 10-6℃-1The cordierite content was 80%.
Example 3:
putting 13kg of bonding clay with the granularity of less than 0.088mm, 37kg of talcum powder, 35kg of flint clay and 15kg of alumina into a ball milling tank, and grinding for 24 hours by taking absolute ethyl alcohol as a grinding medium to obtain cordierite refractory raw material slurry; drying the ball-milled cordierite refractory raw material slurry at 110 ℃ for 12h to obtain a dried cordierite refractory raw material; grinding the dried cordierite refractory raw material to be below 150 meshes to obtain dried cordierite refractory raw material fine powder; dry pressing and molding the dried cordierite refractory raw material fine powder at 5MPa to obtain a cordierite refractory raw material green body; and calcining the cordierite refractory raw material blank in a 1330 ℃ high-temperature furnace, preserving the heat for 6 hours, naturally cooling along with the furnace, and taking out to obtain the cordierite refractory raw material.
Measuring the volume density and the apparent porosity of the sample according to GB/T2997-2000; the samples were chemically analyzed as in GB/T32179-2015. The cordierite refractory raw material synthesized by the method of this example had a bulk density of 1.87g/cm3The apparent porosity was 24.5%, and the thermal expansion coefficient was 1.7X 10-6℃-1The cordierite content was 77%.
The particle sizes of the combined clay, the talcum powder, the flint clay powder and the alumina in the embodiment are all less than 0.088 mm; al in the bonding clay2O3Content 28.29wt.%, SiO2Content 56.81 wt.%; SiO in the talc252.64wt.% MgO content, 31.74 wt.%; al in the flint clay2O3Content 42.65wt.%, SiO2Content 52.74 wt.%; al in the alumina2O3Content 81.12 wt.%; SiO 22The content was 11.79 wt.%.
Claims (2)
1. A method for synthesizing a cordierite refractory raw material by a solid-phase reaction sintering method is characterized in that clay, talcum powder, flint clay powder and alumina are combined as raw materials, and the raw materials are subjected to mixing, drying, grinding, forming and sintering to obtain the cordierite refractory raw material synthesized by the solid-phase reaction sintering method, and the method comprises the following specific operation steps:
(1) mixing materials, namely putting 10-15% of bonding clay, 35-45% of talcum powder, 25-35% of flint clay and 5-20% of alumina together in a ball milling tank in percentage by mass, and grinding for 24 hours by taking absolute ethyl alcohol as a grinding medium to obtain cordierite refractory raw material slurry;
(2) drying, namely drying the ball-milled cordierite refractory raw material slurry at 90-120 ℃ for 10-12h to obtain a dried cordierite refractory raw material;
(3) grinding, namely grinding the dried cordierite refractory raw material to be below 150 meshes to obtain dried cordierite refractory raw material fine powder;
(4) molding, namely molding the dried cordierite refractory raw material fine powder by dry pressing at 4-6MPa to obtain a cordierite refractory raw material green body;
(5) and (3) firing, namely firing the cordierite refractory raw material blank in a 1300-plus-1450 ℃ high-temperature furnace, preserving the temperature for 3-6h, naturally cooling along with the furnace, and then taking out to obtain the cordierite refractory raw material.
2. The method for synthesizing the cordierite refractory raw material by the solid-phase reaction sintering method according to claim 1, wherein the particle sizes of the combined clay, the talcum powder, the flint clay powder and the alumina in the step (1) are all less than 0.088 mm; al in the bonding clay2O3Content 28.29wt.%, SiO2Content 56.81 wt.%; SiO in the talc252.64wt.% MgO content, 31.74 wt.%; al in the flint clay2O3Content 42.65wt.%, SiO2Content 52.74 wt.%; al in the alumina2O3Content 81.12 wt.%; SiO 22The content was 11.79 wt.%.
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Citations (8)
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|---|---|---|---|---|
| CN85109173A (en) * | 1985-11-06 | 1987-05-13 | 国家建筑材料工业局山东工业陶瓷研究设计院 | Crossed cordierite based high temperature ceramic heat-exchanger |
| CN1284407A (en) * | 2000-07-13 | 2001-02-21 | 甘萍 | Preparation of Moled ATG 600 honeycomb ceramic carrier |
| CN1563929A (en) * | 2004-03-24 | 2005-01-12 | 宜兴市顺达电测器件有限公司 | Metal liqid immersing probe fireproof protecting jacket |
| CN101255062A (en) * | 2008-03-29 | 2008-09-03 | 山东陶瓷工业协会 | Low-cost energy-saving high heat-shake resistant kiln appliance and preparation method thereof |
| CN101428808A (en) * | 2008-12-05 | 2009-05-13 | 北京科技大学 | Method for synthesizing dichroite with solid castoff |
| CN103553584A (en) * | 2013-11-22 | 2014-02-05 | 武汉科技大学 | Cordierite and preparation method thereof |
| CN108101558A (en) * | 2017-12-25 | 2018-06-01 | 浙江大学 | Compound saggar, preparation method and applications |
| CN110498669A (en) * | 2019-07-31 | 2019-11-26 | 辽宁科技大学 | A method of periclase matter saggar is prepared using waste magnesia carbon bricks |
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2020
- 2020-02-27 CN CN202010122881.XA patent/CN111233497A/en active Pending
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| CN1284407A (en) * | 2000-07-13 | 2001-02-21 | 甘萍 | Preparation of Moled ATG 600 honeycomb ceramic carrier |
| CN1563929A (en) * | 2004-03-24 | 2005-01-12 | 宜兴市顺达电测器件有限公司 | Metal liqid immersing probe fireproof protecting jacket |
| CN101255062A (en) * | 2008-03-29 | 2008-09-03 | 山东陶瓷工业协会 | Low-cost energy-saving high heat-shake resistant kiln appliance and preparation method thereof |
| CN101428808A (en) * | 2008-12-05 | 2009-05-13 | 北京科技大学 | Method for synthesizing dichroite with solid castoff |
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| CN108101558A (en) * | 2017-12-25 | 2018-06-01 | 浙江大学 | Compound saggar, preparation method and applications |
| CN110498669A (en) * | 2019-07-31 | 2019-11-26 | 辽宁科技大学 | A method of periclase matter saggar is prepared using waste magnesia carbon bricks |
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Application publication date: 20200605 |