CN115716713A - Ion exchange furnace and preparation method of glass with gradient refractive index - Google Patents
Ion exchange furnace and preparation method of glass with gradient refractive index Download PDFInfo
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- CN115716713A CN115716713A CN202110975619.4A CN202110975619A CN115716713A CN 115716713 A CN115716713 A CN 115716713A CN 202110975619 A CN202110975619 A CN 202110975619A CN 115716713 A CN115716713 A CN 115716713A
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- 238000005342 ion exchange Methods 0.000 title claims abstract description 58
- 239000011521 glass Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 150000003839 salts Chemical class 0.000 claims abstract description 65
- 238000011084 recovery Methods 0.000 claims abstract description 44
- 239000005304 optical glass Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 32
- 150000001768 cations Chemical class 0.000 claims description 18
- 238000000354 decomposition reaction Methods 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 239000003365 glass fiber Substances 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- -1 salt cations Chemical class 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 150000002823 nitrates Chemical group 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
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Abstract
The invention relates to the technical field of optical glass processing, in particular to an ion exchange furnace and a preparation method of gradient refractive index glass. The ion exchange furnace comprises a decomposing furnace, an exchange furnace and a recovery furnace, wherein the decomposing furnace is used for decomposing molten salt, the exchange furnace is used for carrying out ion exchange on the molten salt and optical glass, the recovery furnace is used for processing the molten salt after ion exchange, the decomposing furnace is communicated with the exchange furnace through a first high-temperature pipeline, the exchange furnace is communicated with the recovery furnace through a second high-temperature pipeline, the decomposing furnace is communicated with the recovery furnace through a third high-temperature pipeline, the first high-temperature pipeline, the second high-temperature pipeline and the third high-temperature pipeline can bear high temperature of at least 600 ℃, and pump control valves are arranged on the first high-temperature pipeline, the second high-temperature pipeline and the third high-temperature Wen Guandao. The ion exchange furnace provided by the invention can improve the exchange efficiency. The invention also provides a preparation method of the glass with the gradient refractive index prepared by using the ion exchange furnace.
Description
Technical Field
The invention relates to the technical field of optical glass processing, in particular to an ion exchange furnace and a preparation method of gradient refractive index glass.
Background
Ion exchange technology plays a crucial role in the production of gradient index glasses, wherein ion exchange technology is carried out via ion exchange furnaces. In the traditional process, molten salt decomposition, ion exchange and molten salt treatment are all completed in the same furnace body, and the time consumption of the molten salt decomposition stage is long, so that the equipment utilization rate is reduced, the total production period is too long, the time cost is too high, and the production efficiency is severely restricted.
Meanwhile, in the process of preparing the glass with the gradient refractive index by using the traditional static ion exchange method, in the ion exchange stage, the molten salt cannot be added for the second time, cations in the molten salt continuously replace cations in the glass filaments, and along with the exchange process, the content of the cations in the molten salt is continuously attenuated and is difficult to be constantly kept at a high concentration value, so that the ion exchange rate cannot be stably kept at a high-efficiency state, the ion exchange rate is gradually reduced, the exchange time is prolonged, and the performance and the quality of the glass with the gradient refractive index cannot present good consistency.
Disclosure of Invention
Based on the ion exchange furnace and the preparation method of the glass with the gradient refractive index, the invention provides the ion exchange furnace and the preparation method of the glass with the gradient refractive index. The ion exchange furnace can ensure that the concentration of cations in the molten salt is maintained in a dynamic balance state in the ion exchange stage, and improves the ion exchange efficiency, thereby ensuring the consistency of the performance and the quality among the glass with various gradient refractive indexes.
The invention provides an ion exchange furnace, which comprises a decomposing furnace, an exchange furnace and a recovery furnace, wherein the decomposing furnace is used for decomposing molten salt, the exchange furnace is used for ion exchange of the molten salt and optical glass, the recovery furnace is used for processing the molten salt after ion exchange, the decomposing furnace is communicated with the exchange furnace through a first high-temperature pipeline, the exchange furnace is communicated with the recovery furnace through a second high-temperature pipeline, the decomposing furnace is communicated with the recovery furnace through a third high-temperature pipeline, the first high-temperature pipeline, the second high-temperature pipeline and the third high-temperature pipeline can bear the high temperature of at least 600 ℃, and pump control valves are respectively arranged on the first high-temperature pipeline, the second high-temperature pipeline and the third high-temperature pipeline.
In a specific embodiment, the plurality of the exchange furnaces and the plurality of the recovery furnaces are provided in a one-to-one correspondence, wherein the first high temperature duct is divided into a plurality of strands at an end near the exchange furnace to be respectively communicated with the plurality of the exchange furnaces, and the third high temperature duct is divided into a plurality of strands at an end near the recovery furnace to be respectively communicated with the plurality of the recovery furnaces.
In a specific embodiment, the furnace body structures of the decomposing furnace, the exchanging furnace and the recycling furnace comprise a base, a furnace body, a furnace cover, an outer crucible, an inner crucible and a heating element;
the furnace body is provided with a furnace chamber, the furnace cover is matched with the open end of the furnace chamber and used for sealing the furnace chamber, the outer crucible is arranged in the furnace chamber, the inner crucible is arranged in the outer crucible, a gap is formed between the inner crucible and the outer crucible, and the heating element is used for heating the furnace chamber;
the furnace body is provided with a connecting pipeline, wherein the connecting pipeline is used for being connected with the high-temperature pipeline and extending out of the furnace body from the inner crucible.
In a specific embodiment, the heating element comprises a first heating device arranged at the bottom of the furnace cavity and a second heating device arranged on the inner side wall of the furnace body;
in a specific embodiment, the outer side wall of the outer crucible is provided with a temperature sensor corresponding to the second heating device.
In a specific embodiment, the furnace body is provided with an insulating layer.
In a specific embodiment, the furnace cover is provided with an insulating layer.
In one embodiment, the base, furnace body, furnace lid, inner crucible and/or outer crucible are made of stainless steel.
In another aspect of the present invention, there is provided a method for preparing a glass with a gradient refractive index by using the ion exchange furnace, comprising the steps of:
placing the molten salt in a decomposing furnace for heating and decomposing, and conveying the decomposed molten salt to a exchanging furnace through a first high-temperature pipeline;
and adding glass fibers into the exchange furnace, carrying out ion exchange on cations in the glass fibers and cations in the molten salt to prepare glass with the gradient refractive index, conveying the exchanged molten salt to the recovery furnace through the second high-temperature pipeline for molten salt recovery, and conveying the recovered molten salt to the decomposition furnace through the third high-temperature pipeline.
In a particular embodiment, the molten salt is selected from KNO 3 And NaNO 3 At least one of (1).
The molten salt decomposition stage, the ion exchange stage and the molten salt treatment stage are respectively carried out in separate furnaces, and the furnace bodies are communicated through high-temperature pipelines. In the ion exchange stage, the molten salt can be conveyed between the furnaces through a pump-controlled high-temperature pipeline, so that the cation concentration in the molten salt in the exchange furnace can be stably maintained in dynamic balance. Namely, in the ion exchange stage, the molten salt in the decomposing furnace can be continuously conveyed to the exchanging furnace, the exchange products in the exchanging furnace can be continuously conveyed to the recovery furnace for recovery, and the molten salt in the recovery furnace can be continuously conveyed to the decomposing furnace, so that a circulating flow exchange system is formed. In the circulating system, because the recovery furnace still contains a large amount of cations which can participate in the exchange, after the recovery and the reuse of the cations, the cation concentration in the molten salt in the exchange furnace can be ensured to be always maintained in a high-concentration dynamic equilibrium state, so that the ion exchange rate is kept in a stable and efficient state, the exchange time and the production period are shortened, the exchange efficiency and the quality are improved, and the good consistency of products can be kept. And the circulation system effectively eliminates the waiting time of the traditional single furnace in the decomposition stage, and can ensure that the exchange furnace can work uninterruptedly and continuously output products. The yield of waste salt can be reduced after the molten salt is recovered, and resources and cost are saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view showing the connection of a decomposing furnace, an exchanging furnace and a recovering furnace used for producing a glass having a gradient refractive index according to an embodiment of the present invention;
FIG. 2 is a schematic view showing the connection of a decomposing furnace, an exchanging furnace and a recovering furnace used for producing a glass having a gradient refractive index according to another embodiment of the present invention;
FIG. 3 is a schematic view showing the structure of a decomposing furnace, an exchanging furnace and a recovering furnace used for producing a gradient refractive index glass in one embodiment of the present invention;
in the figure: 1-decomposing furnace; 11-a base; 12-a furnace body; 121-furnace chamber; 122-connecting a pipe; 123-a housing; 124-inner shell; 125-first insulating layer; 13-furnace cover; 131-a handle; 132-a housing; 133-an inner shell; 134-a second insulating layer; 14-an outer crucible; 141-a temperature sensor; 15-inner crucible; 16-a heating element; 161-first heating means; 162-a second heating device; 2-exchange furnace; 3-a recovery furnace; 4-a first high temperature pipeline; 5-a second high temperature pipeline; 6-third height Wen Guandao; 7-pump control valve.
Detailed Description
Reference will now be made in detail to embodiments of the invention, one or more examples of which are described below. Each example is provided by way of explanation, not limitation, of the invention. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used on another embodiment to yield a still further embodiment.
It is therefore intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. Other objects, features and aspects of the present invention are disclosed in or are apparent from the following detailed description. It is to be understood by one of ordinary skill in the art that the present discussion is a description of exemplary embodiments only, and is not intended as limiting the broader aspects of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Other than as shown in the operating examples, or where otherwise indicated, all numbers expressing quantities of ingredients, physical and chemical properties, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". For example, unless indicated to the contrary, the numerical parameters set forth in the foregoing specification and attached claims are approximations that can be suitably varied by those skilled in the art in seeking to obtain the desired properties utilizing the teachings disclosed herein. The use of numerical ranges by endpoints includes all numbers within that range and any range within that range, for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4, and 5, and the like.
The indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the number clearly indicates only the singular.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise. In the description of the present invention, "a plurality" means at least one, e.g., one, two, etc., unless specifically limited otherwise.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The terms "length," "width," "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "radial," "axial," "longitudinal," "transverse," "circumferential," and the like, as indicating directions or positional relationships, are based on the directions or positional relationships indicated in the drawings for convenience of description only and are not intended to indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention.
In the patent of the invention, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacted with the first and second features or indirectly contacted with the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1, in one aspect of the present invention, there is provided an ion exchange furnace including a decomposition furnace 1, an exchange furnace 2, and a recovery furnace 3. The decomposing furnace 1 is used for decomposing the fused salt, the exchanging furnace 2 is used for ion exchange between the fused salt and the glass, and the recycling furnace 3 is used for processing the fused salt after the ion exchange. The decomposing furnace 1 is communicated with the exchange furnace 2 through a first high-temperature pipeline 4, and the exchange furnace 2 is communicated with the recovery furnace 3 through a second high-temperature pipeline 5. The decomposing furnace 1 is communicated with the recovery furnace 3 through a third high-temperature pipeline 6. The first high temperature duct 4, the second high temperature duct 5, and the third high temperature duct 6 are capable of withstanding high temperatures of at least 600 ℃. The first high-temperature pipeline 4, the second high-temperature pipeline 5 and the third high-temperature pipeline 6 are respectively provided with a pump control valve 7.
Usually, the molten salt after the ion exchange stage still contains molten salt cations capable of ion exchange, and if the molten salt cations are not recycled, the production cost is greatly wasted. According to the invention, the molten salt decomposition stage, the ion exchange stage and the molten salt treatment stage are carried out in separate furnaces, and the molten salt is transferred and conveyed among the decomposition furnace 1, the exchange furnace 2 and the recovery furnace 3 through the first high-temperature pipeline 4, the second high-temperature pipeline 5 and the third high-temperature pipeline 6 respectively, so that a circulating connection structure is formed among the furnaces. The structure ensures the dynamic balance of the concentration of the cations in the molten salt of the exchange furnace 2, so that the exchange rate of the cations in the molten salt and the cations in the glass is kept in a stable and efficient state, the exchange efficiency and the quality are improved, and the consistency of the performance and the quality of each finally prepared product is ensured. And because the concentration of the fused salt cation in the exchange furnace 2 is always in a high-concentration state, the exchange furnace 2 can continuously output products, the exchange time is shortened, the production efficiency is improved, the utilization rate of the fused salt is also improved, and the production cost is reduced.
In the present invention, the number of the decomposing furnace 1, the exchanging furnace 2 and the recovering furnace 3 is not limited as a further explanation.
In the present invention, as a further explanation, there are a plurality of the exchanging furnace 2 and the recovering furnace 3. The plurality of exchanging furnaces 2 correspond to the plurality of recovery furnaces 3 one by one. Wherein the first high-temperature duct 4 is divided into a plurality of strands at an end near the exchanging furnace 2 to communicate with the plurality of exchanging furnaces 2, respectively, and the third high-temperature duct 6 is divided into a plurality of strands at an end near the recovery furnace 3 to communicate with the plurality of recovery furnaces 3, respectively.
The production efficiency can be improved on the basis of ensuring the consistency of the performance and the quality of the produced products by increasing the number of the furnaces.
Further, in a specific example shown in fig. 2, there are three exchange furnaces 2 and three recovery furnaces 3. Decomposing furnace 1 communicates with three exchange furnaces 2 respectively through first high temperature pipeline 4, and three exchange furnaces 2 communicate with three recovery furnace 3 through second high temperature pipeline 5 one-to-one, and recovery furnace 3 communicates with decomposing furnace 1 through third high temperature pipeline 6. Wherein the first high-temperature piping 4 is divided into three at an end near the exchanging furnace 2, and the third high-temperature piping 6 is divided into three at an end near the recovering furnace 3.
As shown in FIG. 3, in the present invention, as a further explanation, the furnace body structure of the decomposition furnace 1 includes a base 11, a furnace body 12, a furnace cover 13, an outer crucible 14, an inner crucible 15 and a heating member 16;
the furnace body 12 is provided with a furnace chamber 121, the furnace cover 13 is matched with the open end of the furnace chamber 121 for sealing the furnace chamber 121, the outer crucible 14 is arranged in the furnace chamber 121, the inner crucible 15 is arranged in the outer crucible 14, a gap is arranged between the inner crucible 15 and the outer crucible 14, and the heating element 16 is used for heating the furnace chamber 121;
the furnace body 12 is provided with a connecting pipeline 122, wherein the connecting pipeline 122 is used for connecting with a high-temperature pipeline and extends from the inner crucible 15 to the outside of the furnace body 12.
In the present invention, as a further explanation, the heating member 16 includes a first heating device 161 disposed at the bottom of the cavity 121 and a second heating device 162 disposed on the inner sidewall of the furnace body 12;
in the present invention, as a further explanation, the outer sidewall of the outer crucible 14 is provided with a temperature sensor 141 corresponding to the second heating means 162.
In the present invention, as a further explanation, the temperature sensor 141 is vertically or horizontally disposed at a position corresponding to the second heating device 162.
In the present invention, as a further explanation, the first heating device 161 and the second heating device 162 are resistance wires.
In the present invention, as a further explanation, the furnace cover 13 may be further provided with a handle 131. Preferably, the handle 131 is made of stainless steel.
In the present invention, as a further explanation, the furnace body 12 and/or the furnace cover 13 are provided with an insulating layer.
In the present invention, as a further description, the furnace body 12 further includes an outer shell 123 and an inner shell 124, and the first heat preservation layer 125 is disposed between the outer shell 123 and the inner shell 124; and/or
The furnace cover 13 further includes an outer shell 132 and an inner shell 133, and a second insulating layer 134 is disposed between the outer shell 132 and the inner shell 133.
In some embodiments, the materials of the first insulating layer 125 and the second insulating layer 134 are not limited, and materials commonly used in the art may be used.
In the present invention, the base 11, the furnace body 12, the furnace lid 13, the inner crucible 15 and/or the outer crucible 14 are made of stainless steel.
In the present invention, as a further explanation, the exchanging furnace 2 and the recovery furnace 3 have substantially the same furnace structure as the decomposing furnace 1.
In one aspect of the present invention, there is also provided a method for preparing glass with a gradient refractive index by using the ion exchange furnace, comprising the following steps:
putting the molten salt into a decomposing furnace 1 for heating and decomposing, and conveying the decomposed molten salt to an exchange furnace 2 through a first high-temperature pipeline 4;
adding glass fibers into the exchange furnace 2, carrying out ion exchange on cations in the glass fibers and cations in the molten salt to prepare glass with gradient refractive index, conveying the exchanged molten salt to the recovery furnace 3 through the second high-temperature pipeline 5 for recovery, and conveying the recovered molten salt to the decomposition furnace through the third high-temperature pipeline.
The preparation method provided by the invention can maintain the molten salt in the exchange furnace 2 in a dynamic balance state, so that the ion exchange is carried out in the molten salt in a dynamic circulation state, and the exchange efficiency is improved.
In the present invention, the molten salt is selected from nitrates as a further illustration. In some embodiments, the molten salt is selected from KNO 3 And NaNO 3 At least one of (1). In a preferred embodiment, the molten salt is selected from KNO 3 。
In the present invention, as a further explanation, the decomposition temperature of molten salt by heating is 450 to 600 ℃. In a preferred embodiment, the molten salt thermal decomposition temperature is 600 ℃.
The ion exchange furnace and the method for producing graded-index glass according to the present invention will be described in further detail with reference to specific examples.
The examples are all routine in the art, unless otherwise indicated. The experimental procedures without specifying the specific conditions in the examples were carried out under the conventional conditions such as those described in the literature, in books, or as recommended by the manufacturer.
EXAMPLE 1 preparation of gradient index glass
Example 1 the working process of producing gradient index glass using a decomposing furnace 1, an exchanging furnace 2 and a recovering furnace 3 is shown in fig. 1, and the structures of the decomposing furnace 1, the exchanging furnace 2 and the recovering furnace 3 are shown in fig. 3.
The step of preparing the gradient index glass described in example 1 is as follows:
taking KNO 3 Placing in a decomposing furnace 1, heating to decompose it, and introducing KNO via a first high temperature pipeline 4 equipped with a pump control valve 6 3 Continuously conveying to an exchange furnace 2, adding glass fibers with the diameter of 1.8mm into the exchange furnace 2 for ion exchange, taking out the finished product obtained by the exchange, continuously conveying the molten salt to a recovery furnace 3 through a second high-temperature pipeline 5 provided with a pump control valve 7, and recovering KNO 3 Continuously conveying the mixture to the decomposing furnace 1 through a third high-temperature pipeline 6 provided with a pump control valve 7 for continuous decomposition and continuously conveying the mixture to the exchange furnace 2. It was found that 83 hours were required in this example to produce glass filaments of 1.8mm diameter. The positive deviation value of the refractive index distribution constant of the glass with the tested gradient refractive index is 2.32 per thousand, and the negative deviation value is-2.05 per thousand.
Comparative example 1 preparation of gradient index glass
This comparative example 1 used exactly the same glass filaments as in example 1 to produce a gradient index glass. The comparative example uses a conventional single ion exchange furnace, i.e. the molten salt decomposition, ion exchange and molten salt treatment stages are all performed in the same single furnace. It was found by calculation that 97 hours were required in this comparative example to produce glass filaments having a diameter of 1.8 mm. The positive deviation value of the refractive index distribution constant of the glass with the tested gradient refractive index is 7.53 per thousand, and the negative deviation value is-5.61 per thousand.
From the exchange results of example 1 and comparative example 1, it can be seen that the furnace connection structure adopted in the present invention, i.e., the decomposing furnace 1, the exchanging furnace 2 and the recovering furnace 3, forms a circulating connection relationship so that the ion exchange stage is performed in a dynamic circulating exchange system. Compared with the traditional single furnace exchange, namely static exchange, the method provided by the invention ensures that the concentration of the cations in the molten salt is always in a dynamically balanced high-concentration state in the exchange stage, the glass fiber is in a dynamically balanced ion environment, and the ion exchange process is always kept in a high-efficiency state, so that the exchange rate is increased, and the exchange time is shortened.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides an ion exchange furnace, its characterized in that, includes dore furnace, exchange furnace and recovery furnace, the dore furnace is used for decomposing the fused salt, the exchange furnace is used for supplying fused salt and optical glass to carry out ion exchange, the recovery furnace is used for handling the fused salt after the ion exchange, the dore furnace with through first high temperature pipeline intercommunication between the exchange furnace, the exchange furnace with through second high temperature pipeline intercommunication between the recovery furnace, the dore furnace with still through third high temperature pipeline intercommunication between the recovery furnace, first high temperature pipeline second high temperature pipeline with third high temperature pipeline can bear 600 ℃ at least high temperature, first high temperature pipeline second high temperature pipeline with be equipped with pump control valve on the third high temperature pipeline respectively.
2. The ion exchange furnace according to claim 1, wherein there are a plurality of the exchange furnaces and the recovery furnace, a plurality of the exchange furnaces correspond to a plurality of the recovery furnaces one by one, the first high temperature duct is divided into a plurality of strands at an end near the exchange furnace to communicate with the plurality of the exchange furnaces, respectively, and the third high temperature duct is divided into a plurality of strands at an end near the recovery furnace to communicate with the plurality of the recovery furnaces, respectively.
3. The ion exchange furnace according to claim 1 or 2, wherein the furnace body structures of the decomposition furnace, the exchange furnace and the recovery furnace each include a base, a furnace body, a furnace cover, an outer crucible, an inner crucible and a heating element;
the furnace body is provided with a furnace chamber, the furnace cover is matched with the open end of the furnace chamber to be used for sealing the furnace chamber, the outer crucible is arranged in the furnace chamber, the inner crucible is arranged in the outer crucible, a gap is formed between the inner crucible and the outer crucible, and the heating element is used for heating the furnace chamber;
the furnace body is provided with a connecting pipeline, and the connecting pipeline is used for being connected with a high-temperature pipeline and extending from the inner crucible to the outside of the furnace body.
4. The ion exchange furnace of claim 3, wherein the heating element includes a first heating device disposed at a bottom of the furnace chamber and a second heating device disposed on an inner sidewall of the furnace body.
5. The ion exchange furnace of claim 4, wherein the outer side wall of the outer crucible is provided with a temperature sensor corresponding to the second heating device.
6. The ion exchange furnace of claim 3, wherein the furnace body is provided with an insulating layer.
7. The ion exchange furnace of claim 3, wherein the furnace cover is provided with an insulating layer.
8. The ion exchange furnace of claim 3, wherein the base, the furnace body, the furnace cover, the inner crucible, and/or the outer crucible are made of stainless steel.
9. A method for producing a glass having a graded refractive index by using the ion exchange furnace according to any one of claims 1 to 8, comprising the steps of:
placing the molten salt in a decomposing furnace for heating and decomposing, and conveying the decomposed molten salt to an exchange furnace through a first high-temperature pipeline;
and adding glass fibers into the exchange furnace, carrying out ion exchange on cations in the glass fibers and cations in the molten salt to prepare glass with the gradient refractive index, conveying the exchanged molten salt to the recovery furnace through the second high-temperature pipeline for molten salt recovery, and conveying the recovered molten salt to the decomposition furnace through the third high-temperature pipeline.
10. Method for producing a gradient index glass according to claim 9, characterized in that the molten salt is selected from KNO 3 And NaNO 3 At least one of (1).
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0134879B1 (en) * | 1990-03-12 | 1998-04-18 | 한형수 | Regeneration treatment method of molten salt for ion exchange and apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0134879B1 (en) * | 1990-03-12 | 1998-04-18 | 한형수 | Regeneration treatment method of molten salt for ion exchange and apparatus |
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