CN112521005A - Method for improving quality of photo-thermal glass product produced by float process - Google Patents
Method for improving quality of photo-thermal glass product produced by float process Download PDFInfo
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- CN112521005A CN112521005A CN202011391642.0A CN202011391642A CN112521005A CN 112521005 A CN112521005 A CN 112521005A CN 202011391642 A CN202011391642 A CN 202011391642A CN 112521005 A CN112521005 A CN 112521005A
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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
- C03C1/004—Refining agents
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/18—Stirring devices; Homogenisation
- C03B5/187—Stirring devices; Homogenisation with moving elements
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/18—Stirring devices; Homogenisation
- C03B5/193—Stirring devices; Homogenisation using gas, e.g. bubblers
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/225—Refining
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Abstract
A method for improving the quality of photo-thermal glass products produced by a float process comprises the steps of adding a composite clarifying agent into a photo-thermal glass batch, putting the uniformly mixed raw materials into a melting furnace for melting, arranging a bubbling device in the melting furnace, and vertically stirring the melted glass liquid at a neck to form the clarified and homogenized glass liquid for producing the photo-thermal glass. The invention controls the clarification process of the photo-thermal glass by combining the composite clarifier, the glass melting process atmosphere, the bubbling process and the stirring process, reduces the micro bubbles of the photo-thermal glass and improves the product quality.
Description
Technical Field
The invention belongs to the technical field of glass production, and relates to a method for improving the quality of a photo-thermal glass product produced by a float process.
Background
The solar photo-thermal power generation gradually becomes an important part of the solar power generation industry by virtue of the advantages of heat storage, high efficiency, strong power generation continuity and the like, and the solar photo-thermal power generation will be developed rapidly along with the support of the country on new energy power generation. The photothermal glass is a base material for producing a collecting lens which is a core base component of solar photothermal power generation, the performance of the photothermal glass meets the requirement that the solar light transmittance is more than or equal to 91.0 percent, the iron content is an important factor influencing the glass transmittance, and the iron content in the glass is about 80ppm to meet the requirement of the photothermal glass transmittance. In the float production process, along with the reduction of the iron content in the glass, the heat permeability of the glass is increased, the vertical temperature gradient is small, the clarification of the glass is difficult, and the micro-bubbles in the glass are increased, so that the quality of a product is directly influenced. At present, in the aspect of float process production of photo-thermal glass, the process technology is still not mature, and the problem of micro bubbles in the glass needs to be solved. CN107417096A discloses a photo-thermal glass and a preparation method thereof, but adopts the steps of tube drawing, blowing and compression molding after melting in an electric melting furnace, which is different from the float production.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present invention is directed to a method for improving the quality of a product made of photothermal glass by a float process.
The invention adopts the following technical scheme for achieving the purpose:
a method for improving the quality of a photo-thermal glass product produced by a float method comprises the following steps of adding a composite clarifying agent into a photo-thermal glass batch, wherein the composite clarifying agent comprises the following components: the following components are added in each 100g of the photothermal glass batch: sodium sulfate: 0.4-0.7 g; cerium oxide: 0.002-0.008 g; carbon powder: 0.015-0.035 g; putting the uniformly mixed photo-thermal glass batch and the composite clarifying agent into a melting furnace for melting; the melting furnace is provided with 6 pairs of small furnaces, and the temperature of the 1 st pair of small furnaces is as follows: 1470 ℃ and 1490 ℃, the oxygen content of the waste gas is as follows: 1% -2%; the temperature of the No. 2 pair of small furnaces is as follows: 1530-: 2% -3%; the temperature of the No. 3 small furnace is as follows: 1580-: 3% -4%; the temperature of the 4 th pair of small furnaces is as follows: 1530-: 3% -4%; the temperature of the No. 5 small furnace is as follows: 1500-: 4% -5%; the temperature of the No. 6 small furnace is as follows: 1470 ℃ and 1490 ℃, the oxygen content of the waste gas is as follows: 5% -6%; and a bubbling device is also arranged in the melting furnace, and the melted glass liquid is vertically stirred at a neck to form the glass liquid with good clarification and homogenization for producing the photo-thermal glass.
The bubbling device is positioned between the 4 th pair of small furnaces and the 5 th pair of small furnaces, the bubbling frequency is 2-4 times/minute, and the bubble diameter range is 10-50 mm.
The rotating speed of vertical stirring at the neck is 4-8 r/min.
Sodium sulfate and carbon powder in the composite clarifying agent interact with each other, SO is introduced as little as possible during clarification3When the gas is in the gas state, the cerium oxide plays a role in composite clarification through clarification of the valence-variable oxide, and the dosage of the composite clarifier does not influence the transmittance of the photo-thermal glass. The low-oxidizing atmosphere and the high-oxidizing atmosphere of the melting furnace are matched with the process temperature setting to provide conditions for bubble discharge, bubbles are bubbled to forcibly discharge micro bubbles in the glass, the well-clarified glass liquid is further homogenized by vertical stirring, secondary bubbles are avoided, the well-clarified and homogenized glass liquid is formed, the high-quality glass liquid is provided for float forming, annealing and the like, and the micro bubbles in the glass are reduced.
The invention provides a method for improving the quality of a photo-thermal glass product produced by a float process, which adopts the technical scheme and has the following beneficial effects: the invention controls the clarification process of the photo-thermal glass by combining the composite clarifier, the glass melting process atmosphere, the bubbling process and the stirring process, reduces the micro bubbles of the photo-thermal glass and improves the product quality.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention is further described in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A method for improving the quality of a photo-thermal glass product produced by a float method is characterized by comprising the following steps: adding a composite clarifying agent into the photo-thermal glass batch, putting the uniformly mixed raw materials into a melting furnace for melting, arranging a bubbling device in the melting furnace, and vertically stirring the melted glass liquid at a neck to form the clarified and well-homogenized glass liquid for producing the photo-thermal glass.
A method for improving the quality of a photo-thermal glass product produced by a float method is characterized by comprising the following steps: the composite clarifying agent is as follows: the following components are added in each 100g of the photothermal glass batch:
sodium sulfate: 0.4-0.7 g;
cerium oxide: 0.002-0.008 g;
carbon powder: 0.015-0.035 g;
a method for improving the quality of a photo-thermal glass product produced by a float method is characterized by comprising the following steps: the melting furnace is provided with 6 pairs of small furnaces, and the temperature of the 1 st pair of small furnaces is as follows: 1470 ℃ and 1490 ℃, the oxygen content of the waste gas is as follows: 1% -2%; the temperature of the No. 2 pair of small furnaces is as follows: 1530-: 2% -3%; the temperature of the No. 3 small furnace is as follows: 1580-: 3% -4%; the temperature of the 4 th pair of small furnaces is as follows: 1530-: 3% -4%; the temperature of the No. 5 small furnace is as follows: 1500-: 4% -5%; the temperature of the No. 6 small furnace is as follows: 1470 ℃ and 1490 ℃, the oxygen content of the waste gas is as follows: 5 to 6 percent.
A method for improving the quality of a photo-thermal glass product produced by a float method is characterized by comprising the following steps: the bubbling device is positioned between the 4 th pair of small furnaces and the 5 th pair of small furnaces, the bubbling frequency is 2-4 times/minute, and the bubble diameter range is 10-50 mm;
a method for improving the quality of a photo-thermal glass product produced by a float method is characterized by comprising the following steps: the rotating speed of the vertical stirring at the neck is 4-8 r/min.
Example 1:
firstly, mixing photo-thermal glass batch and a composite clarifier and putting the mixture into a melting furnace, wherein the composite clarifier is selected from the following components: sodium sulfate: 0.4g, cerium oxide: 0.003g, carbon powder: 0.02 g; the temperature process of the melting furnace is as follows: the temperature of the No. 1 pair of small furnaces is as follows: 1473 ℃, oxygen content of waste gas is: 1.1 percent; the temperature of the No. 2 small furnace is as follows: 1536 ℃ and the oxygen content of the waste gas is: 2.5 percent; the temperature of the No. 3 small furnace is as follows: 1582 deg.C, oxygen content of waste gas is: 3.2 percent; the temperature of the 4 th pair of small furnaces is as follows: 1541 ℃, the oxygen content of the waste gas is: 3.4 percent; the temperature of the No. 5 small furnace is as follows: 1510 ℃ and the oxygen content of the waste gas is: 4.5 percent; the temperature of the 6 th pair of small furnaces is as follows: 1478 ℃, oxygen content of waste gas is: 5.6 percent. The bubbling frequency is selected to be 2 times/minute, and the bubble diameter range is 20 mm; the rotation speed of vertical stirring is 6 r/min, and then the glass is formed by radial float method, annealed and cut into the photo-thermal glass.
Example 2:
firstly, mixing photo-thermal glass batch and a composite clarifier and putting the mixture into a melting furnace, wherein the composite clarifier is selected from the following components: sodium sulfate: 0.5g, cerium oxide: 0.003g, carbon powder: 0.025 g. The temperature process of the melting furnace is as follows: the temperature of the No. 1 pair of small furnaces is as follows: 1480 ℃ and the oxygen content of the exhaust gas is: 1.4 percent; the temperature of the No. 2 small furnace is as follows: 1542 ℃, the oxygen content of the waste gas is: 2.2 percent; the temperature of the No. 3 small furnace is as follows: 1592 ℃, and the oxygen content of the waste gas is: 3.6 percent; the temperature of the 4 th pair of small furnaces is as follows: 1547 ℃, the oxygen content of the waste gas is: 3.8 percent; the temperature of the No. 5 small furnace is as follows: 1519 deg.C, oxygen content of waste gas is: 4.3 percent; the temperature of the 6 th pair of small furnaces is as follows: 1480 ℃ and the oxygen content of the exhaust gas is: 5.4 percent. The bubbling frequency is selected to be 3 times/minute, and the bubble diameter range is 40 mm; the rotation speed of vertical stirring is 6 r/min, and then the glass is formed by radial float method, annealed and cut into the photo-thermal glass.
Example 3
Firstly, mixing photo-thermal glass batch and a composite clarifier and putting the mixture into a melting furnace, wherein the composite clarifier is selected from the following components: sodium sulfate: 0.6g, cerium oxide: 0.002g, carbon powder: 0.03 g. The temperature process of the melting furnace is as follows: the temperature of the No. 1 pair of small furnaces is as follows: 1482 ℃ and the oxygen content of the exhaust gas is: 1.1 percent; the temperature of the No. 2 small furnace is as follows: 1552 ℃, and the oxygen content of the waste gas is as follows: 2.6 percent; the temperature of the No. 3 small furnace is as follows: 1594 ℃, the oxygen content of the exhaust gas is: 3.3 percent; the temperature of the 4 th pair of small furnaces is as follows: 1555 ℃, and the oxygen content of the waste gas is as follows: 3.9 percent; the temperature of the No. 5 small furnace is as follows: 1524 ℃, the oxygen content of the waste gas is: 4.6 percent; the temperature of the 6 th pair of small furnaces is as follows: 1483 ℃ and the oxygen content of the exhaust gas is: 5.2 percent. The bubbling frequency is selected to be 3 times/minute, and the bubble diameter range is 45 mm; the rotation speed of vertical stirring is 5 r/min, and then the glass is formed by radial float method, annealed and cut into the photo-thermal glass.
Example 4:
firstly, mixing photo-thermal glass batch and a composite clarifier and putting the mixture into a melting furnace, wherein the composite clarifier is selected from the following components: sodium sulfate: 0.7g, cerium oxide: 0.007g, carbon powder: 0.035 g. The temperature process of the melting furnace is as follows: the temperature of the No. 1 pair of small furnaces is as follows: 1479 ℃, oxygen content of waste gas is: 1.6 percent; the temperature of the No. 2 small furnace is as follows: 1556 ℃, and the oxygen content of the waste gas is as follows: 2.8 percent; the temperature of the No. 3 small furnace is as follows: 1596 deg.C, exhaust gas oxygen content: 3.9 percent; the temperature of the 4 th pair of small furnaces is as follows: 1552 ℃, and the oxygen content of the waste gas is as follows: 3.5 percent; the temperature of the No. 5 small furnace is as follows: 1522 ℃, and the oxygen content of the waste gas is as follows: 4.3 percent; the temperature of the 6 th pair of small furnaces is as follows: 1483 ℃ and the oxygen content of the exhaust gas is: 5.7 percent. The bubbling frequency is selected to be 4 times/minute, and the bubble diameter range is 32 mm; the rotation speed of vertical stirring is 5 r/min, and then the glass is formed by radial float method, annealed and cut into the photo-thermal glass.
Comparative example 1:
firstly, mixing photo-thermal glass batch and a composite clarifier and putting the mixture into a melting furnace, wherein the composite clarifier is selected from the following components: sodium sulfate: 0.5g, cerium oxide: 0.03g, carbon powder: 0.04 g. The temperature process of the melting furnace is as follows: the temperature of the No. 1 pair of small furnaces is as follows: 1450 ℃, the oxygen content of the waste gas is: 2.6 percent; the temperature of the No. 2 small furnace is as follows: 1527 ℃, and the oxygen content of the waste gas is as follows: 2.3 percent; the temperature of the No. 3 small furnace is as follows: 1580 deg.C, oxygen content of waste gas is: 4.9 percent; the temperature of the 4 th pair of small furnaces is as follows: the oxygen content of the waste gas is as follows: 3.5 percent; the temperature of the No. 5 small furnace is as follows: 1525 ℃, and the oxygen content of the waste gas is: 3.3 percent; the temperature of the 6 th pair of small furnaces is as follows: 1483 ℃ and the oxygen content of the exhaust gas is: 4.7 percent. The bubbling frequency is selected to be 4 times/minute, and the bubble diameter range is 40 mm; the rotation speed of vertical stirring is 6 r/min, and then the glass is formed by radial float method, annealed and cut into the photo-thermal glass.
Comparative example 2:
firstly, mixing photo-thermal glass batch and a composite clarifier and putting the mixture into a melting furnace, wherein the composite clarifier is selected from the following components: sodium sulfate: 0.6g, cerium oxide: 0.004g, carbon powder: 0.023 g. The temperature process of the melting furnace is as follows: the temperature of the No. 1 pair of small furnaces is as follows: 1469 ℃, and the oxygen content of the waste gas is as follows: 1.6 percent; the temperature of the No. 2 small furnace is as follows: 1537 ℃ and the oxygen content of the waste gas is: 1.8 percent; the temperature of the No. 3 small furnace is as follows: 1586 deg.C, oxygen content of waste gas is: 2.9 percent; the temperature of the 4 th pair of small furnaces is as follows: 1542 ℃, the oxygen content of the waste gas is: 1.5 percent; the temperature of the No. 5 small furnace is as follows: 1518 deg.C, oxygen content of waste gas is: 2.3 percent; the temperature of the 6 th pair of small furnaces is as follows: 1476 ℃, oxygen content of waste gas is: 3.7 percent. The bubbling frequency is selected to be 6 times/minute, and the bubble diameter range is 40 mm; the rotation speed of vertical stirring is 12 r/min, and then the glass is formed by radial float method, annealed and cut into the photo-thermal glass.
Comparative example 3:
firstly, mixing photo-thermal glass batch and a composite clarifier and putting the mixture into a melting furnace, wherein the composite clarifier is selected from the following components: sodium sulfate: 1.2g, cerium oxide: 0.003g, carbon powder: 0.05 g. The temperature process of the melting furnace is as follows: the temperature of the No. 1 pair of small furnaces is as follows: 1474 ℃, oxygen content of waste gas is: 1.0 percent; the temperature of the No. 2 small furnace is as follows: 1538 ℃ and the oxygen content of the waste gas is: 2.5 percent; the temperature of the No. 3 small furnace is as follows: 1579 deg.C, exhaust gas oxygen content: 4.5 percent; the temperature of the 4 th pair of small furnaces is as follows: 1546 ℃, the oxygen content of the waste gas is: 5.0 percent; the temperature of the No. 5 small furnace is as follows: 1522 ℃, and the oxygen content of the waste gas is as follows: 5.5 percent; the temperature of the 6 th pair of small furnaces is as follows: 1482 ℃ and the oxygen content of the exhaust gas is: 6 percent. The bubbling frequency is selected to be 4 times/minute, and the bubble diameter range is 40 mm; the rotation speed of vertical stirring is 10 r/min, and then the glass is formed by radial float method, annealed and cut into the photo-thermal glass.
The light and heat glass transmittance test adopts a Warran cary500 ultraviolet-visible spectrophotometer.
By way of exampleAnd the comparison example shows that the method for improving the quality of the photo-thermal glass product can ensure that the bubble number can reach 0.18/m at the lowest under the condition of not influencing the transmittance of the photo-thermal glass under the condition of matching the composite clarifier, the melting atmosphere and temperature, the bubbling process and the stirring process2Obviously better than the bubble number of the comparative example, and obviously improves the quality of the product.
Claims (3)
1. A method for improving the quality of a photo-thermal glass product produced by a float method is characterized by comprising the following steps: adding a composite clarifying agent into the photo-thermal glass batch, wherein the composite clarifying agent is as follows: the following components are added in each 100g of the photothermal glass batch: sodium sulfate: 0.4-0.7 g; cerium oxide: 0.002-0.008 g; carbon powder: 0.015-0.035 g; putting the uniformly mixed photo-thermal glass batch and the composite clarifying agent into a melting furnace for melting; the melting furnace is provided with 6 pairs of small furnaces, and the temperature of the 1 st pair of small furnaces is as follows: 1470 ℃ and 1490 ℃, the oxygen content of the waste gas is as follows: 1% -2%; the temperature of the No. 2 pair of small furnaces is as follows: 1530-: 2% -3%; the temperature of the No. 3 small furnace is as follows: 1580-: 3% -4%; the temperature of the 4 th pair of small furnaces is as follows: 1530-: 3% -4%; the temperature of the No. 5 small furnace is as follows: 1500-: 4% -5%; the temperature of the No. 6 small furnace is as follows: 1470 ℃ and 1490 ℃, the oxygen content of the waste gas is as follows: 5% -6%; and a bubbling device is also arranged in the melting furnace, and the melted glass liquid is vertically stirred at a neck to form the glass liquid with good clarification and homogenization for producing the photo-thermal glass.
2. The method of claim 1, wherein the step of applying the heat-activated coating to the float glass comprises: the bubbling device is positioned between the 4 th pair of small furnaces and the 5 th pair of small furnaces, the bubbling frequency is 2-4 times/minute, and the bubble diameter range is 10-50 mm.
3. The method of claim 1, wherein the step of applying the heat-activated coating to the float glass comprises: the rotating speed of vertical stirring at the neck is 4-8 r/min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117361873A (en) * | 2023-10-09 | 2024-01-09 | 成都南玻玻璃有限公司 | Ultra-white float light-heat glass and preparation method thereof |
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| WO2019223323A1 (en) * | 2018-05-21 | 2019-11-28 | Yang Dening | Ultra-high alumina glass product manufactured by means of industrial method employing novel cross-fired furnace production system |
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2020
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019223323A1 (en) * | 2018-05-21 | 2019-11-28 | Yang Dening | Ultra-high alumina glass product manufactured by means of industrial method employing novel cross-fired furnace production system |
| CN210367423U (en) * | 2019-03-29 | 2020-04-21 | 湖北三峡新型建材股份有限公司 | Staggered arrangement structure of glass melting furnace bubbler |
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| CN117361873A (en) * | 2023-10-09 | 2024-01-09 | 成都南玻玻璃有限公司 | Ultra-white float light-heat glass and preparation method thereof |
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