CN109761478B - Method for changing color of float glass - Google Patents
Method for changing color of float glass Download PDFInfo
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- CN109761478B CN109761478B CN201910150456.9A CN201910150456A CN109761478B CN 109761478 B CN109761478 B CN 109761478B CN 201910150456 A CN201910150456 A CN 201910150456A CN 109761478 B CN109761478 B CN 109761478B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention belongs to the technical field of float glass, and particularly relates to a color changing method of float glass. The color changing method provided by the invention comprises the following steps: putting a pigment into a feeding port to continuously mix the pigment and the colorless glass base material to form a batch, heating and melting the batch in a melting part to form molten glass, cooling the molten glass to a cooling part, and then flowing the molten glass into a tin bath for molding to prepare a glass plate; in the process of converting the colorless glass into the colored glass, the transmittance of the glass plate is gradually reduced to a preset value; when the transmittance of the glass plate is lower than 89%, the stirrer and the neck water bag are drawn out, and the dilution air volume of the cooling part is increased under the condition of ensuring that the temperature fluctuation of the flow channel is controlled within +/-5 ℃; when the transmittance of the glass plate reaches a preset value, a stirrer and a neck water bag are inserted into the neck, so that the dilution air volume of the cooling part is reduced, and the fluctuation of the temperature of the flow channel is controlled within +/-5 ℃. Can solve the problem of long color change period in the prior art.
Description
Technical Field
The invention belongs to the technical field of float glass, and particularly relates to a color changing method of float glass.
Background
In the float glass production process, the frit color conversion of the glass is a frequent task. At present, two methods are mainly adopted for converting colorless glass into colored glass, namely, emptying colorless glass liquid and adding a new material color glass batch; and secondly, adopting a transition replacement method, and gradually transitioning the colorless glass to the colored glass by properly adding the pigment and mixing with the colorless glass substrate on the basis of producing the colorless glass. Compared with the first method, the second method does not need to carry out discontinuous production and has low cost. However, the existing process for converting colorless glass into colored glass by adopting a transition displacement method generally has the problems of long color changing period, large production of byproduct transition color glass, low yield and the like.
Disclosure of Invention
The invention mainly aims to provide a method for changing color of float glass, which aims to solve the technical problem of long duration of the color changing period of the prior art, and the specific technical scheme is as follows:
a method for changing color of float glass, which adopts transition replacement method to convert colorless glass into colored glass, comprises the following steps:
providing a melting furnace and a tin bath, wherein the inlet end of the tin bath is connected with the tail end of the melting furnace, the inlet end comprises a flow channel, the melting furnace comprises a feeding port, a melting part, a neck and a cooling part which are sequentially arranged, the melting part is provided with a bubbler, the neck is provided with a neck water drum and a stirrer, the outlet end of the cooling part is connected with the tin bath through the flow channel, and the cooling part is loaded with a dilution fan;
providing a coloring material, feeding the coloring material into the feeding port so that the coloring material and the colorless glass base material are continuously mixed to form a batch material, heating and melting the batch material in the melting part to form molten glass, cooling the molten glass in the cooling part, and then flowing the molten glass into the tin bath for molding to prepare a glass plate; in the process of converting the colorless glass into the colored glass, the transmittance of the glass plate is gradually reduced to a preset value;
when the transmittance of the glass plate is lower than 89%, the stirrer and the neck water bag are drawn out, and the dilution air volume of the cooling part is increased under the condition that the temperature fluctuation of the flow channel is controlled within +/-5 ℃;
when the transmittance of the glass plate reaches the preset value, a stirrer and a neck water drum are inserted into the neck, and the dilution air volume of the cooling part is reduced, so that the fluctuation of the temperature of the flow channel is controlled within +/-5 ℃.
According to the color changing process of the float glass, the colorless glass is converted into the colored glass by adopting a transition replacement method, when the transmittance of a glass plate is lower than 89%, the stirrer and the neck water bag are drawn out, the dilution air quantity of the cooling part is increased, the upper and lower temperature difference of the glass liquid of the cooling part is increased, and the convection of the glass liquid at the bottom and the surface of the cooling part is promoted, so that the homogenization of the glass is accelerated, and the color changing time is greatly shortened.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The criterion for successful color change depends on the time spent in the whole color change process, however, in the float glass industry, the color change process for converting the float white glass into the green glass generally needs about one week, at least 5 days, and the color change period is too long.
In order to solve the above technical problems, the applicant provides a method for changing the color of float glass, which comprises the following specific technical scheme:
a method for changing color of float glass, which adopts transition replacement method to convert colorless glass into colored glass, comprises the following steps:
s01, providing a melting furnace and a tin bath, wherein the inlet end of the tin bath is connected with the tail end of the melting furnace, the inlet end comprises a flow channel, the melting furnace comprises a feeding port, a melting part, a neck and a cooling part which are sequentially arranged, the melting part is provided with a bubbler, the neck is provided with a neck water bag and a stirrer, the outlet end of the cooling part is connected with the tin bath through the flow channel, and the cooling part is loaded with a dilution fan;
s02, providing a pigment, feeding the pigment into the feeding port to continuously mix the pigment and the colorless glass base material to form a batch, heating and melting the batch in the melting part to form molten glass, flowing the molten glass to the cooling part to cool, and then flowing the molten glass into the tin bath to mold to prepare a glass plate; in the process of converting the colorless glass into the colored glass, the transmittance of the glass plate is gradually reduced to a preset value;
s03, when the transmittance of the glass plate is lower than 89%, drawing out the stirrer and the neck water bag, and increasing the dilution air volume of the cooling part under the condition that the temperature fluctuation of the flow channel is kept within +/-5 ℃;
and S04, when the transmittance of the glass plate reaches the preset value, inserting a stirrer and a neck water bag into the neck, reducing the dilution air volume of the cooling part, and keeping the temperature fluctuation of the flow channel within +/-5 ℃.
According to the color changing process of the float glass provided by the embodiment of the invention, the colorless glass is converted into the colored glass by adopting a transition replacement method, when the transmittance of a glass plate is lower than 89%, the stirrer and the neck water bag are drawn out, the dilution air volume of the cooling part is increased, the upper and lower temperature difference of the glass liquid of the cooling part is increased, and the convection of the glass liquid at the bottom and the surface of the cooling part is promoted, so that the homogenization of the glass is accelerated, and the color changing time is greatly shortened.
Specifically, in step S01, the melting furnace includes a feeding port, a melting portion, a neck, and a cooling portion, which are sequentially disposed, and the structural composition of the melting furnace is linked to the forming and preparing process of the float glass. The feeding port is used for adding the pigment and the glass base material so that the pigment and the glass base material are mixed to form a batch mixture; the melting part comprises a melting area and a clarifying area, the melting area is connected with the feed inlet and is used for melting the batch to form molten glass, the clarifying area is used for discharging bubbles and homogenizing the molten glass to clarify the molten glass, and the clarifying area is provided with a bubbler which can improve the homogenization degree of the molten glass; the neck is a connecting part between the melting part and the cooling part, and is provided with a neck water bag and a stirrer, so that convection between a hot point and the cooling part is controlled, and homogenization of the molten glass is further promoted; and the cooling part is used for cooling the molten glass to reach the forming temperature and is loaded with a dilution fan used for adjusting the temperature of the cooling part.
The tin bath is a place for forming glass plates by molten glass, and the inlet end of the tin bath is connected with the tail end of the melting furnace. The inlet end comprises a flow channel, the flow channel is a connecting part of the cooling part and the forming tin bath, and the molten glass flows into the forming tin bath from the cooling part through the flow channel.
Specifically, in step S02, the colorant is continuously mixed with the colorless glass base material to convert the colorless glass into the colored glass, thereby realizing the color conversion of the colorless glass. The colorant is a raw material capable of causing color change of the glass during the preparation process, and in the prior art, the colorant is mostly metal oxide, such as iron oxide, chromium oxide, manganese oxide, and the like.
In a preferred embodiment of the invention, the colorant is selected from cullet and/or the transition glass. By recycling the cullet and/or the transition color glass generated in the color changing process, waste is changed into valuable, the cyclic utilization of resources is effectively realized, the energy consumption can be effectively reduced, and the production cost of enterprises is reduced.
In other embodiments, the colorant is doped with iron powder in addition to the cullet and the transition color glass.
Preferably, in the step of feeding the coloring material into the feed port, the amount of dilution air in the cooling unit is reduced while keeping the temperature fluctuation in the flow path within ± 5 ℃. When the pigment is added, the dilution air volume of the cooling part is reduced, the cooling part is preheated, the preheating time is shortened, the convection of glass liquid between the melting part and the cooling part is reduced, the generation of the stripe and the spray defect is reduced, the white glass collection time is prolonged, the yield is improved, and the production cost is reduced.
The flow channel connects the cooling part and the tin bath, and the temperature of the flow channel and the fluctuation degree thereof affect the quality of the glass formed in the tin bath. In the embodiment of the present invention, the temperature of the flow channel is preferably 1050-.
In a preferred embodiment, in the step of feeding the coloring material into the inlet, the dilution air volume in the cooling part is reduced while maintaining the temperature of the flow channel at (1210- + 5) ± 5 ℃.
In the process of converting the colorless glass into the colored glass, the transmittance of the glass plate is gradually reduced to a preset value. The batch formed by mixing the colorant and the colorless glass base material needs to go through the stages of melting, clarifying, cooling and forming in sequence, and the color-changing period lasts for a long time. In the process of converting the colorless glass into the colored glass, the glass plates obtained by tin bath molding are the colorless glass, the light transition color glass, the middle transition color glass, the deep transition color glass and the standard colored glass in turn, and the transmittances of the colorless glass, the light transition color glass, the middle transition color glass, the deep transition color glass and the standard colored glass are reduced in turn.
In one embodiment, the transition displacement method is used to convert the colorless glass into green glass, the transmittance of the colorless glass is more than 89%, the transmittance of the light transition color glass is more than 85% and less than or equal to 89%, the transmittance of the medium transition color glass is more than 79% and less than or equal to 85%, the transmittance of the deep transition color glass is more than 77% and less than or equal to 79%, and the transmittance of the standard green glass is 76% -78%.
Specifically, in step S03, when the transmittance of the glass sheet is less than 89%, the product molded in the tin bath is changed from colorless glass to colored glass. The transition color glass is collected when the transmittance of the glass plate is lower than 89%, so that the situation that part of colorless glass which can be used as a finished product is mixed with the transition color glass for collection can be avoided, and the quality of the colorless glass is ensured.
In one embodiment, the collection of the transition color glass is initiated at 88.75% transmittance of the glass sheet, and the transition color glass is collected and stacked at spaced intervals.
Drawing out the stirrer and the neck water bag, enhancing convection between the melting part and the cooling part, promoting the glass liquid to flow to the cooling part, and shortening the production time of transition color glass; at the same time, the convection between the melting part and the cooling part is enhanced, so that the temperature of the cooling part is increased. On one hand, the dilution air quantity of the cooling part is increased, so that the temperature fluctuation of the runner is kept within +/-5 ℃, and the quality of the formed glass is ensured; on the other hand, by increasing the dilution air volume of the cooling part, the temperature of the glass liquid in the cooling part can be reduced, the convection of the glass liquid at the bottom of the cooling part and the surface of the cooling part is increased, the homogenization of the glass is accelerated, and the color changing time is further shortened.
Preferably, the temperature of the flow path is maintained at (1210-.
In one embodiment, the stirrer and the neck water bag are drawn out, and the dilution air volume of the cooling part is increased to 6500m under the condition that the temperature of the flow passage is ensured to be (1210-3And/h, to maximize the homogenization degree of the molten glass in the cooling part.
Preferably, after the step of drawing out the stirrer and the neck water bag, the flow rate of the bubbler is increased. After the stirrer and the neck water bag are drawn out, the temperature of the bottom of the melting part is reduced too fast, and by increasing the flow of the bubbler, the arch top temperature at a hot point can be reduced and the up-down convection of molten glass can be enhanced, so that the homogenization effect of the molten glass is improved, and the color changing time is shortened.
In one embodiment, after the step of drawing out the stirrer and the neck water bag, the flow rate of the bubbler is increased to 4L/min, 8L/min and 12L/min in this order.
Specifically, in step S04, when the transmittance of the glass sheet reaches the preset value, it indicates that the glass sheet formed in the tin bath reaches the standard, and the transition from colorless glass to colored glass is completed. In one embodiment, the colorless glass is converted into green glass by a transition replacement method, and the transmittance of the glass plate is below 78% in the step of enabling the transmittance of the glass plate to reach the preset value.
The stirrer and the neck water bag are inserted into the neck, so that the homogenization degree of the glass liquid can be improved, and the production quality of the colored glass is ensured. However, when the stirrer and the neck water pack were inserted into the neck, convection between the melting portion and the cooling portion was reduced, and the temperature of the cooling portion was also lowered. The dilution air volume of the cooling part is reduced, the temperature of the molten glass of the cooling part can be properly increased, the temperature of the flow channel is kept stable, and the quality of the formed glass is ensured; meanwhile, the convection of the glass liquid at the bottom of the cooling part and the surface of the cooling part can be increased to a certain extent, the homogenization of the glass is accelerated, and the color changing time is further shortened.
Preferably, after the step of inserting the stirrer and the neck water bag into the neck, the dilution air volume of the cooling part is continuously reduced while maintaining the temperature of the flow passage at (1210- + 5) ± 5 ℃. The dilution air quantity of the cooling part is continuously reduced, the temperature of the cooling part can be improved, the quality problems of zebra stripes and the like of the glass plate caused by the over-low temperature of the cooling part are avoided, and the optical quality of the product is improved.
In one embodiment, in the step of inserting the stirrer and the neck water bag into the neck, the dilution air volume of the cooling part is sequentially reduced to: 6500. 5500, 3500 and 1000m3And h, the temperature of the cooling part is increased, so that the number of the glass speckles can be increased, and the production quality of the colored glass is ensured.
Preferably, after the step of inserting the stirrer and the neck water bag into the neck, a spray gun is provided above the cooling section. The spray gun is arranged above the cooling part, so that the heat loss on the surface of molten glass can be reduced, zebra stripes are prevented from being generated, and the temperature of the cooling part and the temperature of a flow channel are ensured. In one embodiment, at least two groups of spray guns are arranged on the cooling part; in another embodiment, the spray gun provided on the cooling portion is a # 3 LPG spray gun.
In the step of inserting the stirrer and the neck water bag into the neck, the operating frequency of the stirrer and the pressing depth of the stirrer and the neck water bag have great influence on the color changing time, the glass quality and the fuel consumption.
Preferably, the frequency of the stirrer is 15-20Hz, and the pressing depth is 370-380 mm.
In one embodiment, two stirrers are arranged at the neck, and the stirrers rotate clockwise, so that the glass liquid is effectively mixed at the neck, the homogenization of the glass liquid is enhanced, and the color changing time is shortened. In another embodiment, the frequency of the stirrer is 15Hz, and the pressing depth is 380 mm.
Preferably, the neck water bag is embedded 70-80mm below the liquid level of the glass liquid.
In one embodiment, the neck water bag has a width of 300mm, and is completely embedded in the molten glass, wherein the width of the neck water bag is 75mm below the liquid level of the molten glass.
In order that the above-described details and operation of the present invention will be clearly understood by those skilled in the art, and the improved performance of the method for changing color of float glass according to the embodiment of the present invention will be apparent, the practice of the present invention will be illustrated by the following examples.
Example 1
The embodiment prepares a method for changing color of float glass, in particular to a method for converting colorless glass into green glass by adopting a transition displacement method, which comprises the following steps:
s11, providing a melting furnace and a tin bath, wherein the inlet end of the tin bath is connected with the tail end of the melting furnace, the inlet end comprises a flow channel, the melting furnace comprises a feeding port, a melting part, a neck and a cooling part which are sequentially arranged, the melting part is provided with a bubbler, the neck is provided with a neck water bag and a stirrer, the outlet end of the cooling part is connected with the tin bath through the flow channel, and the cooling part is loaded with a dilution fan and a spray gun;
s12, adopting a mixture of F green cullet, transition color glass and iron powder as a pigment, and putting the pigment into the feeding port to continuously mix the pigment and the colorless glass substrate to form a batch; meanwhile, the dilution air quantity of the cooling part is reduced under the condition that the temperature of the flow channel is 1210 +/-5 ℃;
the batch is heated and melted in the melting part to form molten glass, the molten glass flows to the cooling part to be cooled, and then the molten glass flows into the tin bath to be molded to prepare a glass plate; in the process of converting the colorless glass into green glass, the transmittance of the glass plate is gradually reduced to 77%;
s13, when the transmittance of the glass plate is 88.75%, collecting the transition color glass, drawing out the stirrer and the neck water bag, and increasing the dilution air volume of the cooling part to 6500m under the condition of keeping the temperature of the flow channel at 1210 +/-5 DEG C3H; then, the flow rate of the bubbler is sequentially increased to 4L/min, 8L/min and 12L/min;
s14, when the transmittance of the glass plate reaches (77 +/-1)%, inserting a stirrer and a neck clamping water bag into the neck, wherein the frequency of the stirrer is 15Hz, the pressing depth is 380mm, and the neck clamping water bag is embedded 75mm below the liquid level of the glass liquid; then, reducing the dilution air volume of the cooling part to enable the temperature of the runner to be 1210 +/-5 ℃;
when the glass plate formed by the tin bath has ribs, on the premise of keeping the temperature of the flow channel to be 1210 +/-5 ℃, the dilution air quantity of the cooling part is reduced to 6500, 5500, 3500 and 1000m in sequence3H, two groups of 3# LPG spray guns are arranged above the cooling part;
when the optics of the glass plate formed by the tin bath reaches the standard and the quality is stable, the color change is finished.
Statistics shows that the transmittance of the glass plate reaches the standard from the step S11 to the step S14, the average transmittance lasts 53 hours, which is far less than 120 hours (5 days) of the existing color-changing process, and the color-changing time is obviously shortened. Meanwhile, the yield of the colorless glass in the embodiment is 92 percent, which is 2 to 5 percent higher than that of the prior art; the yield of the green glass is 95 percent, which is 2 to 5 percent higher than that of the prior art.
Test example
The green glass obtained in example 1 was used to examine optical data, and table 1 shows the examination results.
TABLE 1
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A method for changing color of float glass is characterized in that a transition replacement method is adopted to convert colorless glass into colored glass, and comprises the following steps:
providing a melting furnace and a tin bath, wherein the inlet end of the tin bath is connected with the tail end of the melting furnace, the inlet end comprises a flow channel, the melting furnace comprises a feeding port, a melting part, a neck and a cooling part which are sequentially arranged, the melting part is provided with a bubbler, the neck is provided with a neck water drum and a stirrer, the outlet end of the cooling part is connected with the tin bath through the flow channel, and the cooling part is loaded with a dilution fan;
providing a coloring material, feeding the coloring material into the feeding port so that the coloring material and the colorless glass base material are continuously mixed to form a batch material, heating and melting the batch material in the melting part to form molten glass, cooling the molten glass in the cooling part, and then flowing the molten glass into the tin bath for molding to prepare a glass plate; in the process of converting the colorless glass into the colored glass, the transmittance of the glass plate is gradually reduced to a preset value; wherein, the pigment is cullet and/or transition color glass generated in the color changing process;
when the transmittance of the glass plate is lower than 89%, the stirrer and the neck water bag are drawn out, and the dilution air volume of the cooling part is increased under the condition that the temperature fluctuation of the flow channel is kept within +/-5 ℃;
when the transmittance of the glass plate reaches the preset value, inserting a stirrer and a neck water bag into the neck, and reducing the dilution air volume of the cooling part to control the temperature fluctuation of the flow channel within +/-5 ℃;
wherein in the step of feeding the coloring material into the feed port, the dilution air volume of the cooling section is reduced while maintaining the temperature fluctuation of the flow path within ± 5 ℃.
2. The method of changing color of a float glass according to claim 1, wherein a flow rate of the bubbler is increased after the step of drawing out the stirrer and the neck water bag.
3. The method of changing color of float glass according to any one of claims 1 or 2, wherein the temperature of the flow channel is 1050-.
4. The method of changing color of a float glass according to any one of claims 1 or 2, wherein a spray gun is provided above the cooling part after the step of inserting a stirrer and a neck water bag into the neck.
5. The method for changing color of a float glass according to any one of claims 1 or 2, wherein in the step of inserting a stirrer and a neck water bag into the neck, the frequency of the stirrer is 15-20Hz and the pressing depth is 370-380 mm; and/or
The neck water bag is buried 70-80mm below the liquid level of the glass liquid.
6. The method of changing color of a float glass according to any one of claims 1 or 2, wherein the colored glass is a green glass;
and in the step of enabling the transmittance of the glass plate to reach the preset value, the transmittance of the glass plate is below 78%.
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| CN201910150456.9A CN109761478B (en) | 2019-02-28 | 2019-02-28 | Method for changing color of float glass |
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| CN201910150456.9A CN109761478B (en) | 2019-02-28 | 2019-02-28 | Method for changing color of float glass |
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| CN109761478B true CN109761478B (en) | 2022-01-14 |
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