CN113149442A - Method for preparing high-temperature-resistant composite crystal by using fly ash - Google Patents
Method for preparing high-temperature-resistant composite crystal by using fly ash Download PDFInfo
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- CN113149442A CN113149442A CN202110306443.3A CN202110306443A CN113149442A CN 113149442 A CN113149442 A CN 113149442A CN 202110306443 A CN202110306443 A CN 202110306443A CN 113149442 A CN113149442 A CN 113149442A
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- temperature
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
- C03C10/0063—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing waste materials, e.g. slags
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/02—Other methods of shaping glass by casting molten glass, e.g. injection moulding
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
- C03C1/002—Use of waste materials, e.g. slags
Abstract
The invention discloses a method for preparing high-temperature-resistant composite crystals by using fly ash, which comprises the following steps: 75-85% of fly ash and 3-8% of Na according to mass percentage2CO3And 10-20% SiO2Mixing, and melting in a high temperature furnace; after the uniformly mixed raw materials are completely melted, quickly casting the melt into a preheated constant-temperature die; addition of mineralizer Fe to the melt2O3And stirring uniformly; cooling the constant temperature die by Fe2O3Fully crystallizing as a mineralizer; within 1h, theCooling the constant temperature mold, and then cooling the mold to room temperature along with the furnace to obtain a composite crystal; and cutting, grinding and polishing the mixed crystal to obtain a high-temperature-resistant mixed crystal finished product. Solves the technical problems of environmental pollution of the fly ash and difficult utilization of the fly ash, reduces the production cost of the synthetic crystal and improves the added value of the product. The method has the advantages of short process, low energy consumption, low raw material cost and high waste utilization rate.
Description
Technical Field
The invention relates to a method for preparing high-temperature-resistant composite crystals by using fly ash, in particular to a method for preparing high-temperature-resistant composite crystals by using fly ash as a main raw material and Na2CO3、SiO2And Fe2O3A method for preparing a synthetic crystal by using an auxiliary material, belonging to the field of resource recovery.
Background
The fly ash is a dangerous waste rich in heavy metals generated after the waste incineration power generation. The main component of which is SiO2CaO and Al2O3. Due to its SiO2CaO and Al2O3The melting point is above 1600 ℃, the melting homogenization difficulty is high, and the recycling difficulty is high. According to related reports, in 2020, fly ash generated by waste incineration power generation reaches 1000 ten thousand tons, the existing disposal capacity is seriously insufficient, and only 10 percent of fly ash can really reach the standard for landfill. At present, the fly ash is mainly buried after heavy metal ions are solidified by adopting a chelating agent, the buried fly ash is difficult to recover resources, waste accumulation is caused, and the problem cannot be fundamentally solved. The main crystal phase in the high-temperature resistant crystal is tridymite, and the optimal stable temperature is 870 ℃.
The fly ash is generated by burning the household garbage, and the aluminum ash is generated by industrial processing and manufacturing, including slag and fly ash generated by medical waste, dangerous waste, chemical drugs and other wastes. There are many reports related to the preparation of microcrystalline glass by using tailing waste residues, and in the prior art, patent No. CN104261677A discloses a method for preparing microcrystalline glass by using lithium beryllium tailings, which uses lithium beryllium tailings and copper-nickel water-quenched slag as raw materials, and adopts a melting method without adding other chemical raw materials to prepare microcrystalline glass.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for preparing high-temperature-resistant synthetic crystals by using fly ash, wherein the raw material for preparing the synthetic crystals takes the fly ash as a main raw material and Na2CO3、SiO2And Fe2O3As an auxiliary material, the synthetic crystal with good high temperature resistance is prepared, the technical problems of environmental pollution of the fly ash and difficult utilization of the fly ash are solved, the production cost of the synthetic crystal is reduced, and the added value of the product is improved.
In order to achieve the purpose, the invention provides the following technical scheme: a method for preparing high-temperature resistant composite crystals by using fly ash comprises the following steps: step one, 75-85% of fly ash and 3-8% of Na are mixed according to mass percentage2CO3And 10-20% SiO2Mixing, and loading into high temperature furnaceOxidizing and melting;
step two, after the uniformly mixed raw materials are completely melted at 1300-1600 ℃, quickly casting the melt into a constant-temperature die preheated at 1300-1600 ℃ in advance;
step three, melting the mixture according to the proportion of 98 to 98.5 percent of melt and 1 to 1.5 percent of Fe2O3In a ratio of adding a mineralizer Fe to the solution2O3And stirring uniformly;
step four, cooling the constant-temperature mould to 870 ℃ within 12h at a cooling rate of 0.6-0.7 ℃/min, and using Fe2O3Fully crystallizing as a mineralizer;
step five, cooling the constant-temperature die to 163 ℃ within 1h, and then cooling the constant-temperature die to room temperature along with the furnace to obtain a composite crystal;
sixthly, cutting, grinding and polishing the mixed crystal to obtain a high-temperature-resistant mixed crystal finished product; wherein the main crystal phases of the synthetic crystal are wollastonite and gehlenite.
Compared with the prior art, the invention has the beneficial effects that: solves the technical problems of environmental pollution of the fly ash and difficult utilization of the fly ash, reduces the production cost of the synthetic crystal and improves the added value of the product. And the method has the advantages of short process, low energy consumption, low raw material cost and high waste utilization rate.
Drawings
FIG. 1 is a schematic diagram of a specific preparation process of the present invention;
FIG. 2 is a report of the detection of the refractory eutectic prepared in the examples of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: referring to fig. 1, a method for preparing refractory eutectic by using fly ash includes the following steps:
firstly, analyzing the components of the raw materials, and batching the raw materials according to the analysis result of the components. The raw material component ratio is shown in table-1, the chemical composition of the raw material is shown in table-2, and the chemical composition of the product is shown in table-3.
TABLE-1 raw material ratio (wt.%) of refractory eutectic
| Raw materials | Fly ash | Na2CO3 | SiO2 |
| Glass ceramics | 80.00 | 5.00 | 15.00 |
TABLE-2 fly ash chemical composition (wt.%)
| Components | SiO2 | Al2O3 | CaO | Fe2O3 | Others |
| Fly ash | 27.20 | 11.90 | 15.5 | 4.03 | 41.37 |
Secondly, uniformly mixing the raw materials according to the component ratio, then putting the mixture into a high-temperature furnace, carrying out non-oxidation melting on the uniformly mixed raw materials at 1500 ℃, and after complete melting, rapidly casting the melt into a constant-temperature die preheated at 1500 ℃ in advance;
thirdly, according to the proportion of 98.5 percent of fused mass and 1.5 percent of Fe2O3In a ratio of adding a mineralizer Fe to the solution2O3And stirring uniformly;
fourthly, cooling the constant temperature mould to 870 ℃ within 12h at a cooling rate of 0.6-0.7 ℃/min, and using Fe2O3Fully crystallizing as a mineralizer;
fifthly, cooling the constant-temperature die to 163 ℃ within 1h, and then cooling the constant-temperature die to room temperature along with the furnace to obtain a crystal;
and sixthly, cutting, grinding and polishing the mixed crystal to obtain a high-temperature-resistant mixed crystal finished product, wherein the main crystal phases of the mixed crystal are wollastonite and gehlenite. The high-temperature resistant finished product of the synthetic crystal prepared in the example 1 is detected, the detection report is shown in figure 2, and the chemical composition of the product is shown in the table-3.
TABLE-3 high temperature resistant eutectic chemical composition
Example 2: referring to fig. 1, a method for preparing refractory eutectic by using fly ash includes the following steps:
firstly, analyzing the components of the raw materials, and batching the raw materials according to the analysis result of the components. The raw material composition ratio is shown in table-11, and the raw material chemical composition is shown in table-12.
TABLE-11 raw material ratio (wt.%) of refractory eutectic
| Raw materials | Fly ash | Na2CO3 | SiO2 |
| Glass ceramics | 75.00 | 5.00 | 20.00 |
TABLE-12 fly ash chemical composition (wt.%)
| Components | SiO2 | Al2O3 | CaO | Fe2O3 | Others |
| Fly ash | 28.20 | 10.90 | 17.5 | 3.03 | 40.37 |
Secondly, uniformly mixing the raw materials according to the component ratio, then putting the mixture into a high-temperature furnace, carrying out non-oxidation melting on the uniformly mixed raw materials at 1600 ℃, and after complete melting, rapidly casting the melt into a constant-temperature mold preheated at 1600 ℃ in advance;
thirdly, according to the proportion of 98.5 percent of fused mass and 1.5 percent of Fe2O3In a ratio of adding a mineralizer Fe to the solution2O3And stirring uniformly;
fourthly, cooling the constant temperature mould to 870 ℃ within 12h at a cooling rate of 0.6-0.7 ℃/min, and using Fe2O3Fully crystallizing as a mineralizer;
fifthly, cooling the constant-temperature die to 163 ℃ within 1h, and then cooling the constant-temperature die to room temperature along with the furnace to obtain a crystal;
and sixthly, cutting, grinding and polishing the mixed crystal to obtain a high-temperature-resistant mixed crystal finished product, wherein the main crystal phases of the mixed crystal are wollastonite and gehlenite. The high-temperature resistant finished product of the synthetic crystal prepared in the example 1 is detected, the detection report is shown in figure 2, and the chemical composition of the product is shown in a table-13.
TABLE-13 high temperature resistant synthetic crystal chemical composition
Those not described in detail in this specification are within the skill of the art.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (2)
1. A method for preparing high-temperature-resistant composite crystals by using fly ash is characterized by comprising the following steps: the specific method comprises the following steps: step one, 75-85% of fly ash and 3-8% of Na are mixed according to mass percentage2CO3And 10-20% SiO2Mixing, and melting in a high temperature furnace;
step two, after the uniformly mixed raw materials are completely melted at 1300-1600 ℃, quickly casting the melt into a constant-temperature die preheated at 1300-1600 ℃ in advance;
step three, melting the mixture according to the proportion of 98 to 98.5 percent of melt and 1 to 1.5 percent of Fe2O3In a ratio of adding a mineralizer Fe to the solution2O3And stirring uniformly;
step four, cooling the constant-temperature mould to 870 ℃ within 12h at a cooling rate of 0.6-0.7 ℃/min, and using Fe2O3Fully crystallizing as a mineralizer;
step five, cooling the constant-temperature die to 163 ℃ within 1h, and then cooling the constant-temperature die to room temperature along with the furnace to obtain a composite crystal;
and step six, cutting, grinding and polishing the mixed crystal to obtain a high-temperature-resistant mixed crystal finished product.
2. The method for preparing high temperature resistant eutectic crystal by using fly ash as claimed in claim 1, wherein: the main crystal phases of the mixed crystal are wollastonite and gehlenite.
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| CN202110306443.3A CN113149442A (en) | 2021-03-23 | 2021-03-23 | Method for preparing high-temperature-resistant composite crystal by using fly ash |
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| CN202110306443.3A CN113149442A (en) | 2021-03-23 | 2021-03-23 | Method for preparing high-temperature-resistant composite crystal by using fly ash |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102531389A (en) * | 2011-12-15 | 2012-07-04 | 天津城市建设学院 | Method for preparing pyroceram by melting garbage incineration flying ash in arc furnace |
| CN104261677A (en) * | 2014-09-16 | 2015-01-07 | 新疆大学 | Method for preparing microcrystalline glass from lithium beryllium tailings |
| CN109160742A (en) * | 2018-11-14 | 2019-01-08 | 西南科技大学 | It is a kind of using flyash as the devitrified glass of raw material |
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- 2021-03-23 CN CN202110306443.3A patent/CN113149442A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102531389A (en) * | 2011-12-15 | 2012-07-04 | 天津城市建设学院 | Method for preparing pyroceram by melting garbage incineration flying ash in arc furnace |
| CN104261677A (en) * | 2014-09-16 | 2015-01-07 | 新疆大学 | Method for preparing microcrystalline glass from lithium beryllium tailings |
| CN109160742A (en) * | 2018-11-14 | 2019-01-08 | 西南科技大学 | It is a kind of using flyash as the devitrified glass of raw material |
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Application publication date: 20210723 |