CN105645419A - Industrialized production method of cordierite structure material with ultralow heat expansion coefficient - Google Patents
Industrialized production method of cordierite structure material with ultralow heat expansion coefficient Download PDFInfo
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- CN105645419A CN105645419A CN201511026506.0A CN201511026506A CN105645419A CN 105645419 A CN105645419 A CN 105645419A CN 201511026506 A CN201511026506 A CN 201511026506A CN 105645419 A CN105645419 A CN 105645419A
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- C01B33/00—Silicon; Compounds thereof
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Abstract
The invention discloses an industrialized production method of a cordierite structure material with ultralow heat expansion coefficient. The industrialized production method comprises the following steps of (1) uniformly stirring qualified raw materials for preparing the cordierite material strictly according to the ratio requirement; (2) throwing the uniformly mixed materials into an industrial melting furnace, heating, and completely melting; (3) enabling the melting liquid to flow out, quenching by water, and drying; (4) performing crystallizing and heat treatment on the dried material, so as to obtain the cordierite structure material; (5) crushing the crystallized material, or grinding into a powder, so as to obtain the material with the grain size meeting the technical requirement. Compared with the prior art, the industrialized production method has the advantages that the continuous and scaled industrial production is realized, the production time is short, the production efficiency is high, the crystallizing reaction degree is high, and the product quality is high and controllable.
Description
Technical field
The present invention relates to cordierite material preparation field, more particularly to the industrialized preparing process of a kind of ultra-low thermal expansion cordierite structure material.
Background technology
The character such as cordierite has low-expansion coefficient, excellent anti-seismic performance, and chemical stability is good, are widely used in the industries such as catalytic cleaning of car tail gas, Industrial Stoves dedusting accumulation of heat, petroleum catalytic cracking, are a kind of important structural ceramic materials.
Though cordierite has the synthesis preparation method of number of ways, but solid sintering technology is still that main method at present for industrial-scale production; It is to be made by mechanical means to carry out physical mixed between the granule of initial feed, then is sintered producing; Owing between feed particles being solid phase contact, contact area and sintering reaction degree are affected by suitable restriction so that it is response speed is slow, and crystallization degree is on the low side, production cycle is long, and the product that product quality is difficult to acquisition good quality by the impact of productive prospecting, stability is high.
Along with the progress of modern industry kiln, the manufacture method adopting superhigh temperature melted has become as possibility; If cordierite persursor material can adopt fusion method to prepare, by the melted mixing uniformity improving component, it will be a great change. Compared with traditional solid-phase sintering method, it can be obviously improved the physicochemical property of material, improve the stability of crystallization degree, raising product quality, expands the range of choice of raw material, reduces production cost.
Once there were some fusion methods to prepare Research Literature and the Patent Publication of cordierite aspect, but due to the restriction of condition, these researchs also predominantly stayed in laboratory stage, did not also carry out industrialized production at present.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, provide the industrialized preparing process of a kind of ultra-low thermal expansion cordierite structure material, the production making cordierite structure material is more efficient, and quality is more stable, it is achieved technical scaleization produces.
For solving above-mentioned technical problem, the present invention by the following technical solutions:
A kind of industrialized preparing process of ultra-low thermal expansion cordierite structure material, it is characterised in that, comprise the following steps:
(1) by preparing the magnesium source of cordierite material, aluminum source, silicon source be converted into the molal quantity of element M g, Al, Si, it is Mg:Al:Si=2:3.4-4:4.5-5.2 mix homogeneously in molar ratio, obtain cordierite mixed material, described magnesium source is magnesium oxide, magnesium carbonate, magnesium hydroxide one or more, source of aluminium is aluminium hydroxide, aluminium oxide one or more, described silicon source is silica flour;
(2) melting in the cordierite mixed material input smelting furnace in step (1), the temperature of described smelting furnace is 1580-1660 DEG C;
(3) releasing from smelting furnace through the liquation of the cordierite mixed material after step (2) is melted, shrend, drying obtain graininess cordierite persursor material;
(4) the graininess cordierite persursor material obtained in step (3) is carried out Crystallizing treatment in crystallization furnace;
(5) material after Crystallizing treatment is carried out broken or grinding, namely become the Industrial raw material preparing various cordierite products.
Preferably, described magnesium source, aluminum source, the impurity content of silicon source material is by weight percentage less than 0.15%.
Preferably, described silicon source is SiO2Content silica flour more than or equal to 99.3% by weight percentage.
Preferably, described magnesium source is light magnesium oxide.
Preferably, described aluminum source is aluminium hydroxide.
Preferably, in described step (2), the mode of heating of smelting furnace is that flame directly heats or electrical heating.
Preferably, in described step (2), the feed way of smelting furnace is continuous charging.
Preferably, described step (3) is dried the granularity obtaining graininess cordierite persursor material less than 6 orders.
Preferably, in described step (4), the process of Crystallizing treatment is: graininess cordierite persursor material being put into crystallization furnace, crystallization furnace is warming up to 740-760 DEG C, and is incubated 180min, heating rate is 5-8 DEG C/min; Then again crystallization furnace being warming up to 1215-1245 DEG C, and be incubated 180min, heating rate is 5-8 DEG C/min; Finally, cool down.
Preferably, in described step (5), broken particle diameter is 20-100 order; Grinding particle diameter is 200-400 order.
Compared with prior art, the invention has the beneficial effects as follows:
1. adopt the inventive method to carry out cordierite structure manufacture of materials, it is possible to realize seriality large-scale industrial and produce; One smelting furnace (melting area 16m2) one day yield then can produce 20-30 ton, and steady quality, improve the physicochemical property of material, improve the crystallization degree of material.
2. the present invention is to raw-material range of choice width, is not affected by crystal formation, composition, volatilization grading factors; Adopting each technological process and equipment all ripe and use, production efficiency is high, constant product quality.
Detailed description of the invention
The present invention is further illustrated below. Embodiments of the present invention include but not limited to the following example.
[embodiment 1]
The work process of the present embodiment is as follows: by preparing the magnesium source of cordierite material, aluminum source, silicon source be converted into the molal quantity of element M g, Al, Si, be Mg:Al:Si=2:3.4:4.5 mix homogeneously in molar ratio, obtain cordierite mixed material; Described magnesium source is one or more in magnesium oxide, magnesium carbonate, magnesium hydroxide, and the present embodiment is preferably light magnesium oxide; Source of aluminium is one or more in aluminium hydroxide, aluminium oxide, and the present embodiment is preferably aluminium hydroxide; Described silicon source is silica flour, and the present embodiment is preferably SiO2Content silica flour more than or equal to 99.3% by weight percentage, the impurity content of described light magnesium oxide, aluminium hydroxide and silica flour is respectively less than 0.15% by weight percentage. Adopting the mode of continuous charging to put in smelting furnace cordierite mixed material to melt, the temperature of described smelting furnace is 1580 DEG C; Described smelting furnace is industrial smelting furnace, hearth inner lining electro-corundum brick; Described furnace heats mode is that flame directly heats or electrical heating, and the present embodiment is preferably the direct combustion heating of Flame of Natural Gas. The liquation of the cordierite mixed material after then melting flows out from smelting furnace, and shrend, drying obtain graininess cordierite persursor material, and described drying obtains the granularity of graininess cordierite persursor material less than 6 orders;The graininess cordierite persursor material obtained is carried out Crystallizing treatment in crystallization furnace, the process of described Crystallizing treatment is: graininess cordierite persursor material is put into crystallization furnace, crystallization furnace being warming up to 740 DEG C, and is incubated 180min, heating rate is 5 DEG C/min; Then again crystallization furnace being warming up to 1215 DEG C, and be incubated 180min, heating rate is 5 DEG C/min. Material after Crystallizing treatment carries out broken or grinding, and the present embodiment is preferably broken, and broken particle diameter is 20 orders, namely becomes the Industrial raw material preparing various cordierite products. The cordierite Industrial raw material that the present embodiment produces is 33.1 �� 10 at-800 DEG C of coefficients of volume expansion of room temperature-7��-1��
[embodiment 2]
The work process of the present embodiment is as follows: by preparing the magnesium source of cordierite material, aluminum source, silicon source be converted into the molal quantity of element M g, Al, Si, be Mg:Al:Si=2:4:5.2 mix homogeneously in molar ratio, obtain cordierite mixed material; Described magnesium source is one or more in magnesium oxide, magnesium carbonate, magnesium hydroxide, and the present embodiment is preferably light magnesium oxide; Source of aluminium is one or more in aluminium hydroxide, aluminium oxide, and the present embodiment is preferably aluminium hydroxide; Described silicon source is silica flour, and the present embodiment is preferably SiO2Content silica flour more than or equal to 99.3% by weight percentage, the impurity content of described light magnesium oxide, aluminium hydroxide and silica flour is respectively less than 0.15% by weight percentage. Adopting the mode of continuous charging to put in smelting furnace cordierite mixed material to melt, the temperature of described smelting furnace is 1660 DEG C; Described smelting furnace is industrial smelting furnace, hearth inner lining electro-corundum brick; Described furnace heats mode is that flame directly heats or electrical heating, and the present embodiment is preferably the direct combustion heating of Flame of Natural Gas. The liquation of the cordierite mixed material after then melting flows out from smelting furnace, and shrend, drying obtain graininess cordierite persursor material, and described drying obtains the granularity of graininess cordierite persursor material less than 6 orders; The graininess cordierite persursor material obtained is carried out Crystallizing treatment in crystallization furnace, the process of described Crystallizing treatment is: graininess cordierite persursor material is put into crystallization furnace, crystallization furnace being warming up to 760 DEG C, and is incubated 180min, heating rate is 8 DEG C/min; Then again crystallization furnace being warming up to 1245 DEG C, and be incubated 180min, heating rate is 8 DEG C/min. Material after Crystallizing treatment carries out broken or grinding, and the present embodiment is preferably broken, and broken particle diameter is that namely 100 orders become the Industrial raw material preparing various cordierite products. The cordierite Industrial raw material that the present embodiment produces is 33.2 �� 10 at-800 DEG C of coefficients of volume expansion of room temperature-7��-1��
[embodiment 3]
The work process of the present embodiment is as follows: by preparing the magnesium source of cordierite material, aluminum source, silicon source be converted into the molal quantity of element M g, Al, Si, be Mg:Al:Si=2:3.7:4.8 mix homogeneously in molar ratio, obtain cordierite mixed material; Described magnesium source is one or more in magnesium oxide, magnesium carbonate, magnesium hydroxide, and the present embodiment is preferably light magnesium oxide; Source of aluminium is one or more in aluminium hydroxide, aluminium oxide, and the present embodiment is preferably aluminium hydroxide; Described silicon source is silica flour, and the present embodiment is preferably SiO2Content silica flour more than or equal to 99.3% by weight percentage, the impurity content of described light magnesium oxide, aluminium hydroxide and silica flour is respectively less than 0.15% by weight percentage. Adopting the mode of continuous charging to put in smelting furnace cordierite mixed material to melt, the temperature of described smelting furnace is 1620 DEG C;Described smelting furnace is industrial smelting furnace, hearth inner lining electro-corundum brick; Described furnace heats mode is that flame directly heats or electrical heating, and the present embodiment is preferably the direct combustion heating of Flame of Natural Gas. The liquation of the cordierite mixed material after then melting flows out from smelting furnace, and shrend, drying obtain graininess cordierite persursor material, and described drying obtains the granularity of graininess cordierite persursor material less than 6 orders; The graininess cordierite persursor material obtained is carried out Crystallizing treatment in crystallization furnace, the process of described Crystallizing treatment is: graininess cordierite persursor material is put into crystallization furnace, crystallization furnace being warming up to 750 DEG C, and is incubated 180min, heating rate is 6.5 DEG C/min; Then again crystallization furnace being warming up to 1230 DEG C, and be incubated 180min, heating rate is 6.5 DEG C/min. Material after Crystallizing treatment carries out broken or grinding, and the present embodiment is preferably broken, and broken particle diameter is 60 orders, namely becomes the Industrial raw material preparing various cordierite products. The cordierite Industrial raw material that the present embodiment produces is 33.0 �� 10 at-800 DEG C of coefficients of volume expansion of room temperature-7��-1��
[embodiment 4]
The work process of the present embodiment is as follows: by preparing the magnesium source of cordierite material, aluminum source, silicon source be converted into the molal quantity of element M g, Al, Si, be Mg:Al:Si=2:3.5:4.6 mix homogeneously in molar ratio, obtain cordierite mixed material; Described magnesium source is one or more in magnesium oxide, magnesium carbonate, magnesium hydroxide, and the present embodiment is preferably light magnesium oxide; Source of aluminium is one or more in aluminium hydroxide, aluminium oxide, and the present embodiment is preferably aluminium hydroxide; Described silicon source is silica flour, and the present embodiment is preferably SiO2Content silica flour more than or equal to 99.3% by weight percentage, the impurity content of described light magnesium oxide, aluminium hydroxide and silica flour is respectively less than 0.15% by weight percentage. Adopting the mode of continuous charging to put in smelting furnace cordierite mixed material to melt, the temperature of described smelting furnace is 1585 DEG C; Described smelting furnace is industrial smelting furnace, hearth inner lining electro-corundum brick; Described furnace heats mode is that flame directly heats or electrical heating, and the present embodiment is preferably the direct combustion heating of Flame of Natural Gas. The liquation of the cordierite mixed material after then melting flows out from smelting furnace, and shrend, drying obtain graininess cordierite persursor material, and described drying obtains the granularity of graininess cordierite persursor material less than 6 orders; The graininess cordierite persursor material obtained is carried out Crystallizing treatment in crystallization furnace, the process of described Crystallizing treatment is: graininess cordierite persursor material is put into crystallization furnace, crystallization furnace being warming up to 742 DEG C, and is incubated 180min, heating rate is 6 DEG C/min; Then again crystallization furnace being warming up to 1217 DEG C, and be incubated 180min, heating rate is 6 DEG C/min. Material after Crystallizing treatment carries out broken or grinding, and the present embodiment is preferably grinding, and grinding particle diameter is 200 orders, namely becomes the Industrial raw material preparing various cordierite products. The cordierite Industrial raw material that the present embodiment produces is 33.1 �� 10 at-800 DEG C of coefficients of volume expansion of room temperature-7��-1��
[embodiment 5]
The work process of the present embodiment is as follows: by preparing the magnesium source of cordierite material, aluminum source, silicon source be converted into the molal quantity of element M g, Al, Si, be Mg:Al:Si=2:3.9:5.1 mix homogeneously in molar ratio, obtain cordierite mixed material; Described magnesium source is one or more in magnesium oxide, magnesium carbonate, magnesium hydroxide, and the present embodiment is preferably light magnesium oxide; Source of aluminium is one or more in aluminium hydroxide, aluminium oxide, and the present embodiment is preferably aluminium hydroxide;Described silicon source is silica flour, and the present embodiment is preferably SiO2Content silica flour more than or equal to 99.3% by weight percentage, the impurity content of described light magnesium oxide, aluminium hydroxide and silica flour is respectively less than 0.15% by weight percentage. Adopting the mode of continuous charging to put in smelting furnace cordierite mixed material to melt, the temperature of described smelting furnace is 1655 DEG C; Described smelting furnace is industrial smelting furnace, hearth inner lining electro-corundum brick; Described furnace heats mode is that flame directly heats or electrical heating, and the present embodiment is preferably the direct combustion heating of Flame of Natural Gas. The liquation of the cordierite mixed material after then melting flows out from smelting furnace, and shrend, drying obtain graininess cordierite persursor material, and described drying obtains the granularity of graininess cordierite persursor material less than 6 orders; The graininess cordierite persursor material obtained is carried out Crystallizing treatment in crystallization furnace, the process of described Crystallizing treatment is: graininess cordierite persursor material is put into crystallization furnace, crystallization furnace being warming up to 758 DEG C, and is incubated 180min, heating rate is 7 DEG C/min; Then again crystallization furnace being warming up to 1243 DEG C, and be incubated 180min, heating rate is 7 DEG C/min. Material after Crystallizing treatment carries out broken or grinding, and the present embodiment is preferably grinding, and grinding particle diameter is 400 orders, namely becomes the Industrial raw material preparing various cordierite products. The cordierite Industrial raw material that the present embodiment produces is 33.0 �� 10 at-800 DEG C of coefficients of volume expansion of room temperature-7��-1��
It is embodiments of the invention as mentioned above. The present invention is not limited to above-mentioned embodiment, and anyone should learn the structure change made under the enlightenment of the present invention, and every have same or like technical scheme with the present invention, each falls within protection scope of the present invention.
Claims (10)
1. the industrialized preparing process of a ultra-low thermal expansion cordierite structure material, it is characterised in that, comprise the following steps:
(1) the Lv Yuangui source, magnesium source preparing cordierite material is converted into the molal quantity of element M g Al Si; it is Mg:Al:Si=2:3.4-4:4.5-5.2 mix homogeneously in molar ratio; obtain cordierite mixed material; described magnesium source is magnesium oxide; magnesium carbonate, magnesium hydroxide one or more, source of aluminium is aluminium hydroxide; aluminium oxide one or more, described silicon source is silica flour;
(2) melting in the cordierite mixed material input smelting furnace in step (1), the temperature of described smelting furnace is 1580-1660 DEG C;
(3) releasing from smelting furnace through the liquation of the cordierite mixed material after step (2) is melted, shrend is dried and is obtained graininess cordierite persursor material;
(4) the graininess cordierite persursor material obtained in step (3) is carried out Crystallizing treatment in crystallization furnace;
Material after Crystallizing treatment is carried out broken or grinding, namely becomes the Industrial raw material preparing various cordierite products.
2. the industrialized preparing process of a kind of ultra-low thermal expansion cordierite structure material according to claim 1, it is characterised in that: described magnesium source, aluminum source, the impurity content of silicon source material is by weight percentage less than 0.15%.
3. the industrialized preparing process of a kind of ultra-low thermal expansion cordierite structure material according to claim 1, it is characterised in that: described silicon source is SiO2Content silica flour more than or equal to 99.3% by weight percentage.
4. the industrialized preparing process of a kind of ultra-low thermal expansion cordierite structure material according to claim 1, it is characterised in that: described magnesium source is light magnesium oxide.
5. the industrialized preparing process of a kind of ultra-low thermal expansion cordierite structure material according to claim 1, it is characterised in that: described aluminum source is aluminium hydroxide.
6. the industrialized preparing process of a kind of ultra-low thermal expansion cordierite structure material according to claim 1, it is characterised in that: in described step (2), the mode of heating of smelting furnace is that flame directly heats or electrical heating.
7. the industrialized preparing process of a kind of ultra-low thermal expansion cordierite structure material according to claim 1, it is characterised in that: in step (2), the feed way of smelting furnace is continuous charging.
8. the industrialized preparing process of a kind of ultra-low thermal expansion cordierite structure material according to claim 1, it is characterised in that: described step (3) is dried the granularity obtaining graininess cordierite persursor material less than 6 orders.
9. the industrialized preparing process of a kind of ultra-low thermal expansion cordierite structure material according to claim 1; it is characterized in that: in described step (4), the process of Crystallizing treatment is: graininess cordierite persursor material is put into crystallization furnace; crystallization furnace is warming up to 740-760 DEG C; and it being incubated 180min, heating rate is 5-8 DEG C/min; Then again crystallization furnace being warming up to 1215-1245 DEG C, and be incubated 180min, heating rate is 5-8 DEG C/min; Finally, cool down.
10. the industrialized preparing process of a kind of ultra-low thermal expansion cordierite structure material according to claim 1, it is characterised in that: in described step (5), broken particle diameter is 20-100 order; Grinding particle diameter is 200-400 order.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106276933A (en) * | 2016-07-22 | 2017-01-04 | 中国科学院青海盐湖研究所 | A kind of method preparing threadiness lithium magnesium silicate powder body |
| WO2022110956A1 (en) * | 2020-11-26 | 2022-06-02 | 长安大学 | Method for preparing inorganic fibers by means of sintered mineral pellet electric melting |
| GB2607984A (en) * | 2020-11-26 | 2022-12-21 | Changan Univ | Method for preparing inorganic fibres by means of sintered mineral pellet electric melting |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106276933A (en) * | 2016-07-22 | 2017-01-04 | 中国科学院青海盐湖研究所 | A kind of method preparing threadiness lithium magnesium silicate powder body |
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| WO2022110956A1 (en) * | 2020-11-26 | 2022-06-02 | 长安大学 | Method for preparing inorganic fibers by means of sintered mineral pellet electric melting |
| GB2607984A (en) * | 2020-11-26 | 2022-12-21 | Changan Univ | Method for preparing inorganic fibres by means of sintered mineral pellet electric melting |
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