CN114524667A - High-stability low-cost preparation process for artificially synthesized mullite - Google Patents
High-stability low-cost preparation process for artificially synthesized mullite Download PDFInfo
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Abstract
The invention discloses a high-stability low-cost preparation process for artificially synthesized mullite, which belongs to the technical field of mullite, and comprises the following steps: the method comprises the following steps of firstly, preparing raw materials in advance, wherein the raw materials comprise a raw material A, a raw material B and a raw material C, carrying out primary crushing, screening and airing on all the raw materials, secondly, proportioning and mixing ferric oxide and aluminum simple substances in the raw material A, carrying out alumina proportion adjustment on high bauxite and kaolin contained in the raw material B, and drying and crushing. The method has the advantages that the aluminothermic reaction generated by combining the elemental aluminum and the ferric oxide can realize the preliminary hot melting of various raw materials, the heating energy consumption ratio is saved in the subsequent sintering process of the kiln, the production energy consumption ratio for producing the mullite can be reduced, a large amount of waste gas cannot be generated, the actual environmental protection performance is higher, and the proportion of various raw materials to the aluminum oxide is utilized.
Description
Technical Field
The invention relates to the technical field of mullite, in particular to a high-stability low-cost preparation process for artificially synthesized mullite.
Background
Mullite refers to a series of minerals composed of aluminosilicate and is generally called, it is worth mentioning that a SiO2-Al2O3 system is the most important binary system in ceramics, more than ten different phase diagrams are published in succession from a first mullite phase diagram published in 1909, the focus of controversy is whether mesophase mullite is a stable compound or an unstable compound, and later problems are unified, the components of the mullite are not fixed, and the alumina content of the mullite fluctuates between 72% and 78%.
The existing mullite production usually needs to adopt high-purity electric melting, common electric melting, all-natural sintering and light burning, a large amount of waste gas and waste are generated in the actual production process, the actual environmental protection effect is poor, in the subsequent recording process, the production cost is found to be high, the energy consumption mainly concentrated in the heating stage is high, a large amount of time is spent, the raw materials are wasted in primary heating, and the quality of a finished product is not stable.
Disclosure of Invention
The invention aims to provide a preparation process for artificially synthesizing mullite with high stability and low cost. According to the high-stability low-cost preparation process for artificially synthesized mullite, disclosed by the invention, the aluminothermic reaction generated by combining the elemental aluminum and the ferric oxide can realize the primary hot melting of various raw materials, the energy consumption ratio of heating is saved in the subsequent sintering process of a kiln, the heat preservation is well carried out, the production energy consumption ratio of the produced mullite can be reduced, a large amount of waste gas cannot be generated, the actual environmental protection performance is higher, and the stable finished product quality can be realized by utilizing the proportion of various raw materials to the aluminum oxide.
In order to achieve the above effects, the present invention provides the following technical solutions: a high-stability low-cost preparation process for artificially synthesized mullite comprises the following steps:
the method comprises the steps of firstly, preparing raw materials in advance, wherein the raw materials comprise a raw material A, a raw material B and a raw material C, and performing primary crushing, screening and airing on all the raw materials.
And step two, proportioning and mixing ferric oxide and the simple substance aluminum in the raw material A, adjusting the alumina proportion of the high-alumina bauxite and kaolin contained in the raw material B, drying and crushing.
And step three, the raw material C comprises silicon dioxide, calcium hexaluminate and calcium oxide, is subjected to wet grinding by a ball mill, and is dried and broken up.
And step four, firstly, placing the raw material A into the reaction kettle, igniting the raw material A by using magnesium powder, then, putting sufficient raw material B into the reaction kettle, removing liquid molten iron, and then, putting the raw material C into the reaction kettle.
And fifthly, firing by using a kiln at 1450-1800 ℃, and cooling to obtain a finished product.
Further, the method comprises the following steps: according to the operation steps in the first step, the raw materials A, B and C need to be humidified in advance before being prepared, and the humidity is kept at 15%.
Further, the method comprises the following steps: according to the operation steps in the second step, the molar mass ratio of the ferric oxide to the simple substance aluminum is 2: 1-1.25.
Further, the method comprises the following steps: according to the operation steps in the second step, the alumina content of the high bauxite and the kaolin is not less than 45%.
Further, the method comprises the following steps: according to the operating procedure in step three, the ratio of silica, calcium hexaluminate and calcium oxide is 5: 1: 2. further, the method comprises the following steps: according to the operation steps in the third step, the water content of the dried and scattered raw material C is lower than 1%. Further, the method comprises the following steps: according to the operation steps in the fourth step, the water content of the dried raw material C is lower than 1%. Further, the method comprises the following steps: and (4) according to the operation steps in the fourth step, liquid molten iron is removed, the inclined reaction kettle is adopted, so that the molten iron flows out, and the residual molten iron is oxidized to generate iron oxide when the temperature is reduced and the C raw material is waited.
Further, the method comprises the following steps: according to the operation steps in the fifth step, the firing time of the kiln is controlled to be 5-12 hours, the heating temperature is increased by 100 ℃ every ten minutes in the first 1 hour.
Further, the method comprises the following steps: and cooling according to the operation steps in the fifth step, wherein the temperature needs to be reduced to 780 ℃ for 1 hour.
The invention provides a high-stability low-cost preparation process for artificially synthesized mullite, which has the following beneficial effects:
the high-stability low-cost preparation process for artificially synthesized mullite can realize preliminary hot melting of various raw materials by combining aluminothermic reaction generated by the elemental aluminum and the ferric oxide, saves the energy consumption ratio of heating in the subsequent sintering process of a kiln, well preserves heat, can reduce the production energy consumption ratio of the produced mullite, does not generate a large amount of waste gas, has higher actual environmental protection performance, and can realize stable finished product quality by utilizing the proportion of various raw materials to aluminum oxide.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Detailed Description
The invention provides a technical scheme that: referring to fig. 1, a process for preparing synthetic mullite with high stability and low cost includes the following steps:
the method comprises the steps of firstly, preparing raw materials in advance, wherein the raw materials comprise a raw material A, a raw material B and a raw material C, and performing primary crushing, screening and airing on all the raw materials.
And step two, proportioning and mixing ferric oxide and the simple substance aluminum in the raw material A, adjusting the alumina proportion of the high-alumina bauxite and kaolin contained in the raw material B, drying and crushing.
And step three, the raw material C comprises silicon dioxide, calcium hexaluminate and calcium oxide, is subjected to wet grinding by a ball mill, and is dried and broken up.
And step four, firstly, placing the raw material A into the reaction kettle, igniting the raw material A by using magnesium powder, then, putting sufficient raw material B into the reaction kettle, removing liquid molten iron, and then, putting the raw material C into the reaction kettle.
And fifthly, firing by using a kiln at 1450-1800 ℃, and cooling to obtain a finished product.
Specifically, the method comprises the following steps: according to the operation steps in the first step, the raw materials A, B and C need to be humidified in advance before being prepared, and the humidity is kept at 15%.
Specifically, the method comprises the following steps: according to the operation steps in the second step, the molar mass ratio of the ferric oxide to the simple substance aluminum is 2: 1-1.25.
Specifically, the method comprises the following steps: according to the operation steps in the second step, the alumina content of the high bauxite and the kaolin is not less than 45%.
Specifically, the method comprises the following steps: according to the operating procedure in step three, the ratio of silica, calcium hexaluminate and calcium oxide is 5: 1: 2.
specifically, the method comprises the following steps: according to the operation steps in the third step, the water content of the dried and scattered raw material C is lower than 1 percent
Specifically, the method comprises the following steps: according to the operation steps in the fourth step, the water content of the dried raw material C is lower than 1%.
Specifically, the method comprises the following steps: and (4) according to the operation steps in the fourth step, liquid molten iron is removed, the inclined reaction kettle is adopted, so that the molten iron flows out, and the residual molten iron is oxidized to generate iron oxide when the temperature is reduced and the C raw material is waited.
Specifically, the method comprises the following steps: according to the operation steps in the fifth step, the firing time of the kiln is controlled to be 5-12 hours, the heating temperature is increased by 100 ℃ every ten minutes in the first 1 hour.
Specifically, the method comprises the following steps: and cooling according to the operation steps in the fifth step, wherein the temperature needs to be reduced to 780 ℃ for 1 hour. The methods of the examples were carried out for detection analysis,
and compared with the prior art, the following data are obtained:
| production cost | Environmental protection performance | Energy consumption ratio | |
| Examples | Is lower than | Is higher than | Is lower than |
| Prior Art | Is higher than | Is lower than | Is higher than |
According to the table data, when the embodiment is implemented, the high-stability low-cost preparation process for the artificially synthesized mullite is adopted, the high-stability low-cost preparation process for the artificially synthesized mullite can realize the preliminary hot melting of various raw materials by combining the aluminothermic reaction generated by the simple substance aluminum and the ferric oxide, saves the energy consumption ratio of heating in the subsequent sintering process of the kiln, well preserves the heat, can reduce the production energy consumption ratio of the mullite, does not generate a large amount of waste gas, has higher actual environmental protection performance, and can realize stable finished product quality by utilizing the proportion of the various raw materials to the aluminum oxide. The invention provides a high-stability low-cost preparation process of artificially synthesized mullite, which comprises the following steps:
the method comprises the following steps of firstly, preparing raw materials in advance, wherein the raw materials comprise a raw material A, a raw material B and a raw material C, performing primary crushing, screening and airing on all the raw materials, humidifying the raw materials A, B and C in advance before preparation, keeping the humidity at 15%, secondly, proportioning and mixing ferric oxide and an aluminum simple substance in the raw material A, adjusting the alumina proportion of high bauxite and kaolin contained in the raw material B, drying and crushing, and performing molar mass proportioning of the ferric oxide and the aluminum simple substance to be 2: 1-1.25, the content of alumina in the high-alumina bauxite and kaolin is not less than 45%, in the third step, the raw material C contains silica, calcium hexaluminate and calcium oxide, wet grinding is carried out by adopting a ball mill, then air drying and scattering are carried out, and the proportion of the silica, the calcium hexaluminate and the calcium oxide is 5: 1: 2, the water content of the C material after being dried and scattered is lower than 1%, step four, firstly, the A material is placed in the reaction kettle, the A material is ignited by utilizing magnesium powder, the principle of thermit reaction is that a redox reaction of aluminum simple substance is carried out under the condition of high temperature, the strong reducibility of aluminum is reflected, because the enthalpy of formation (-1645kJ/mol) of aluminum oxide is extremely low, huge heat can be emitted by the reaction, even the generated metal can appear in a molten state, on the other hand, the reaction emits large amount of heat to melt aluminum, the reaction speed is extremely high in the liquid phase, a great amount of heat can be emitted in a short time, the intensity of the thermit reaction is determined by the oxidability of metal ions, according to estimation, 500 g of thermit (the components are iron oxide and aluminum) can be burnt out in 30 seconds, at this moment, a sufficient amount of the B material is put into the reaction kettle, liquid molten iron is removed, and putting the C raw material into a reaction kettle, wherein the water content of the dried C raw material is lower than 1%, removing liquid molten iron, inclining the reaction kettle to enable the molten iron to flow out, and oxidizing the residual molten iron to generate ferric oxide when the temperature of the residual molten iron is reduced to wait for the C raw material, wherein the sintering temperature is 1450-1800 ℃, a finished product can be prepared after cooling, the sintering time of the kiln is controlled for 5-12 hours, the heating temperature is increased by 100 ℃ every ten minutes for 1 hour, cooling is carried out until the temperature is reduced to 780 ℃, and the cooling lasts for 1 hour, wherein the actual main components of the finished product are 68-73% of aluminum oxide, less than or equal to 1.0% of ferric oxide and 22-25% of silicon oxide.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The preparation process of artificially synthesized mullite with high stability and low cost is characterized by comprising the following steps:
s1, preparing raw materials in advance, wherein the raw materials comprise a raw material A, a raw material B and a raw material C, and performing primary crushing, screening and airing on all the raw materials;
s2, proportioning and mixing ferric oxide and aluminum simple substance in the raw material A, adjusting the alumina proportion of high bauxite and kaolin contained in the raw material B, drying and crushing;
s3, grinding the raw material C containing silicon dioxide, calcium hexaluminate and calcium oxide by a ball mill in a wet method, and then airing and scattering;
s4, firstly, placing the raw material A into a reaction kettle, igniting the raw material A by using magnesium powder, then, putting sufficient raw material B into the reaction kettle, removing liquid molten iron, and then, putting the raw material C into the reaction kettle;
and S5, firing by using a kiln at 1450-1800 ℃, and cooling to obtain the finished product.
2. The process for preparing artificial mullite according to claim 1, which comprises the following steps: according to the operation procedure in S1, the raw materials a, B and C need to be humidified in advance before being prepared, and the humidity is maintained at 15%.
3. The process for preparing artificial mullite according to claim 2, which comprises the following steps: according to the operation step in S2, the molar mass ratio of the ferric oxide to the aluminum simple substance is 2: 1-1.25.
4. The process for preparing artificial mullite according to claim 3, which comprises the following steps: according to the operation procedure in S2, the alumina content of the high bauxite and the kaolin is not less than 45%.
5. The process for preparing artificial mullite according to claim 4, which comprises the following steps: according to the operating procedure in S3, the ratio of silica, calcium hexaluminate and calcium oxide is 5: 1: 2.
6. the process for preparing artificial mullite according to claim 5, which comprises the following steps: according to the operation step in S3, the water content of the dried and scattered raw material C is lower than 1%.
7. The process for preparing artificial mullite according to claim 6, which comprises the following steps: according to the operation step in S4, the moisture content of the dried raw material C is lower than 1%.
8. The process for preparing artificial mullite according to claim 7, which comprises the following steps: according to the operation step in the S4, liquid molten iron is removed, the reaction kettle is inclined, so that the molten iron flows out, and the residual molten iron is oxidized to generate iron oxide when the temperature is reduced and the residual molten iron is waiting for the raw material C.
9. The process for preparing artificial mullite according to claim 8, which comprises the following steps: according to the operation steps in the S5, the firing time of the kiln is controlled to be 5-12 hours, the heating temperature is increased by 100 ℃ every ten minutes in the first 1 hour.
10. The process for preparing artificial mullite according to claim 9, which comprises the following steps: according to the operation step in S5, the cooling needs to be carried out at 780 ℃ for 1 hour.
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| CN202111651101.1A CN114524667A (en) | 2021-12-30 | 2021-12-30 | High-stability low-cost preparation process for artificially synthesized mullite |
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| GB716265A (en) * | 1951-06-13 | 1954-09-29 | Babcock & Wilcox Co | Mullite refractories |
| CN1312237A (en) * | 2001-02-16 | 2001-09-12 | 张世平 | Artificial mullite synthesizing process |
| CN101805197A (en) * | 2010-04-22 | 2010-08-18 | 上海海事大学 | Production method of corundum-mullite-zirconia |
| CN101905969A (en) * | 2010-09-06 | 2010-12-08 | 山西高科耐火材料股份有限公司 | Bauxite-based low-creep mullite product |
| CN103408297A (en) * | 2013-08-26 | 2013-11-27 | 武汉科技大学 | Calcium hexaluminate-mullite composite material and preparation method thereof |
| CN106220190A (en) * | 2015-11-12 | 2016-12-14 | 中国科学院过程工程研究所 | A kind of method utilizing aluminous fly-ash to prepare mullite |
| CN106431370A (en) * | 2016-09-09 | 2017-02-22 | 武汉科技大学 | Mullite raw material adopting alumina-chrome slag as main ingredient and preparation method thereof |
| CN112430756A (en) * | 2020-10-13 | 2021-03-02 | 中色（宁夏）东方集团有限公司 | Niobium-iron alloy production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB716265A (en) * | 1951-06-13 | 1954-09-29 | Babcock & Wilcox Co | Mullite refractories |
| CN1312237A (en) * | 2001-02-16 | 2001-09-12 | 张世平 | Artificial mullite synthesizing process |
| CN101805197A (en) * | 2010-04-22 | 2010-08-18 | 上海海事大学 | Production method of corundum-mullite-zirconia |
| CN101905969A (en) * | 2010-09-06 | 2010-12-08 | 山西高科耐火材料股份有限公司 | Bauxite-based low-creep mullite product |
| CN103408297A (en) * | 2013-08-26 | 2013-11-27 | 武汉科技大学 | Calcium hexaluminate-mullite composite material and preparation method thereof |
| CN106220190A (en) * | 2015-11-12 | 2016-12-14 | 中国科学院过程工程研究所 | A kind of method utilizing aluminous fly-ash to prepare mullite |
| CN106431370A (en) * | 2016-09-09 | 2017-02-22 | 武汉科技大学 | Mullite raw material adopting alumina-chrome slag as main ingredient and preparation method thereof |
| CN112430756A (en) * | 2020-10-13 | 2021-03-02 | 中色（宁夏）东方集团有限公司 | Niobium-iron alloy production method |
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