Iodine vapor and ammonia gas-based mixed gas recovery system and application

Abstract

The application provides a mixed gas recovery system based on iodine vapor and ammonia gas and an application, which comprises a flue gas collecting hood, a recovery device, a porous adsorption mechanism and an exhaust device, the porous adsorption mechanism comprises at least one porous sponge strip, and a plurality of porous sponge strips are arranged longitudinally and transversely in the recovery device; after the mixed gas is discharged into the flue gas collecting hood through the exhaust port of the exhaust device and then flows into the recovery device, the water medium is contacted with the iodine vapor to perform desublimation of the iodine vapor, so that the iodine vapor is converted into iodine crystals, the iodine crystals are adsorbed by the porous adsorption mechanism, the water medium is contacted with the ammonia gas to perform dissolution of the ammonia gas, so that the ammonia gas is converted into ammonia water, the air in which the iodine vapor and the ammonia gas are removed is discharged from the recovery device by the exhaust device, and the recovery of the iodine vapor and the ammonia gas is realized; by the system, the problems that the ammonia gas and the iodine vapor cannot be recovered simultaneously when the IP plate is produced at present, the cost is high when the ammonia gas or the iodine vapor is treated separately, the steps are complex, the environment is not friendly and other problems are solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of gas recovery, in particular to a mixed gas recovery system based on iodine vapor and ammonia gas and application. BACKGROUND

[0002] An X-ray storage image plate (IP plate) is a carrier for recording an X-ray image, and is a core component of a computed radiography (CR) technology. The IP plate can absorb and store X-ray energy under X-ray irradiation by using special fluorescent material to form a latent image. The latent image is converted into a visible light signal by laser scanning, and then the visible light signal is subjected to photoelectric conversion and digital processing to obtain an X-ray image.

[0003] A core functional layer of the IP plate is a fluorescent powder layer, and the fluorescent powder layer is a key factor determining the performance of the IP plate. 2+ The fluorescent powder has become a key research object in the field of IP plate production due to high X-ray absorption rate, high light excitation and light emission efficiency, and good stability. When the BaF(Br, I):Eu 2+ fluorescent powder is sintered at high temperature, iodine vapor and ammonia gas are often generated during the reaction of ammonium iodide and ammonium fluoride in the raw material at high temperature. The emission of iodine vapor and ammonia gas from the high-temperature furnace into the atmosphere pollutes the environment and harms the human body.

[0004] At present, there is no technology that can simultaneously recover iodine vapor and ammonia gas in the treatment technology of toxic and harmful gases, which hinders the development of the IP plate. Separately treating each kind of waste gas not only has high cost and complex steps, but also introduces organic solvents or other chemical reagents, which requires additional steps and cost to treat byproducts, and does not meet the current principle requirements of green chemistry in China. SUMMARY

[0005] To solve the problems that iodine vapor and ammonia gas cannot be recovered simultaneously at present, and that the cost is high, the steps are complex, and the environment is not friendly when ammonia gas or iodine vapor is treated separately, one of the purposes of the application is to provide a mixed gas recovery system based on iodine vapor and ammonia gas. The second purpose of the application is to provide an application of the mixed gas recovery system based on iodine vapor and ammonia gas in the field of X-ray storage image plate preparation, to solve the environmental pollution problem caused in the production process of the IP plate.

[0006] The first aspect of the application provides a mixed gas recovery system based on iodine vapor and ammonia gas, and the technical scheme adopted is:

[0007] A mixed gas recovery system based on iodine vapor and ammonia gas, comprising:

[0008] A smoke collecting hood is arranged in the area where the exhaust port of a high-temperature furnace is located, the high-temperature furnace is characterized by a high-temperature furnace for preparing an X-ray storage image plate, and the exhaust port outputs a mixed gas including air carrying iodine vapor and ammonia gas.

[0009] A recovery device is in communication with the smoke collecting hood, and the recovery device is filled with a water medium; the water medium includes an aqueous solution and / or water vapor.

[0010] A porous adsorption mechanism is arranged in the recovery device; the porous adsorption mechanism includes at least one porous sponge strip, and a plurality of the porous sponge strips are arranged longitudinally and transversely in the recovery device.

[0011] An exhaust device is in communication with the recovery device.

[0012] After the exhaust device discharges the mixed gas into the smoke collecting hood through the exhaust port, the mixed gas flows into the recovery device, the water medium contacts the iodine vapor to sublimate the iodine vapor, the iodine vapor is converted into iodine crystals, the iodine crystals are adsorbed by the porous adsorption mechanism, the water medium contacts the ammonia gas to dissolve the ammonia gas, the ammonia gas is converted into ammonia water, the air carrying the iodine vapor and the ammonia gas is discharged from the recovery device by the exhaust device, and the recovery of the iodine vapor and the ammonia gas is simultaneously achieved.

[0013] As one of the preferred solutions, the water medium is water vapor; and the recovery system further includes:

[0014] A water mist generator is arranged in the recovery device to generate water vapor filled in the recovery device.

[0015] As one of the preferred solutions, the bottom of the recovery device is provided with a recovery box, and each of the porous sponge strips has a distance from the recovery box.

[0016] As one of the preferred solutions, the recovery device is further provided with:

[0017] A plurality of partitions, each two of the partitions form an adsorption channel, and the adsorption channel is configured to extend the length of the flow path of the mixed gas in the recovery device; and

[0018] At least part of the area in each of the adsorption channels is one-to-one installed with the porous sponge strip.

[0019] As one of the preferred solutions, a spill-proof curtain is mounted around the periphery of the smoke collecting hood.

[0020] The second aspect of the present application provides an application of the mixed gas recovery system based on iodine vapor and ammonia gas as provided in the first aspect of the present application in the field of X-ray storage panel preparation, the application process comprising an X-ray storage panel preparation step and a gas recovery step; wherein,

[0021] The X-ray storage panel preparation step comprises:

[0022] The reaction raw materials are selected and placed in a high-temperature furnace, and BaF(Br, I):Eu is synthesized in the high-temperature furnace by a solid phase method 2+ The fluorescent powder generates iodine vapor and ammonia gas in the sintering process and is discharged from the exhaust port of the high-temperature furnace along with air;

[0023] The BaF(Br, I):Eu 2+ fluorescent powder is coated as a fluorescent powder layer of the X-ray storage panel;

[0024] The gas recovery step comprises:

[0025] The mixed gas discharged from the exhaust port in the preparation step is input into a flue gas collecting hood;

[0026] The mixed gas is converged into the recovery device by the flue gas collecting hood;

[0027] The iodine vapor contacts the water medium in the recovery device to sublimate the iodine vapor and obtain iodine crystals;

[0028] The iodine crystals are adsorbed by a porous adsorption mechanism;

[0029] The ammonia gas contacts the water medium in the recovery device to dissolve the ammonia gas and obtain ammonia water;

[0030] The air from which the iodine vapor and ammonia gas are removed is discharged from the recovery device by an exhaust device to simultaneously recover the iodine vapor and ammonia gas.

[0031] As one of the preferred solutions, the gas recovery step further comprises:

[0032] Water vapor is generated in the recovery device by a water mist generator.

[0033] As one of the preferred solutions, the gas recovery step further comprises:

[0034] The ammonia water is collected in a recovery box at the bottom of the recovery device;

[0035] The iodine crystals are adsorbed in other areas of the recovery device except the bottom.

[0036] As one of the preferred solutions, the step of flowing the mixed gas into the recovery device after the mixed gas is discharged into the smoke collection hood comprises:

[0037] After the mixed gas flows into the recovery device, the mixed gas is divided into the adsorption channels formed by the partitions;

[0038] The porous adsorption sponge strips in each adsorption channel adsorb the iodine crystals formed by the condensation of the iodine vapor flowing through the porous adsorption sponge strips.

[0039] As one of the preferred solutions, the step of flowing the mixed gas into the recovery device after the mixed gas is discharged into the smoke collection hood comprises:

[0040] During the process of discharging the mixed gas into the smoke collection hood, the anti-overflow curtain is used to block the mixed gas from flowing out of the gap between the exhaust port and the smoke collection hood.

[0041] Compared with the prior art, the present application has the following advantages:

[0042] The embodiment of the present application provides a mixed gas recovery system based on iodine vapor and ammonia gas, which comprises a smoke collection hood, which is used to be sleeved on an area where an exhaust port of a high-temperature furnace is located, the high-temperature furnace is characterized by a high-temperature furnace used for preparing an X-ray storage image plate, and the exhaust port outputs mixed gas, the mixed gas comprises air carrying iodine vapor and ammonia gas; a recovery device in communication with the smoke collection hood, the recovery device is filled with a water medium; the water medium comprises an aqueous solution and / or water vapor; a porous adsorption mechanism arranged in the recovery device; the porous adsorption mechanism comprises at least one porous sponge strip, and a plurality of the porous sponge strips are arranged longitudinally and transversely in the recovery device; and an exhaust device in communication with the recovery device; wherein after the exhaust device discharges the mixed gas into the smoke collection hood through the exhaust port, the mixed gas flows into the recovery device, the water medium contacts the iodine vapor to condense the iodine vapor, so that the iodine vapor is converted into iodine crystals, the iodine crystals are adsorbed by the porous adsorption mechanism, at the same time, the water medium contacts the ammonia gas to dissolve the ammonia gas, so that the ammonia gas is converted into ammonia water, the air carrying the iodine vapor and the ammonia gas is discharged from the recovery device by the exhaust device, so that the recovery of the iodine vapor and the ammonia gas is realized at the same time.

[0043] By adopting the technical solution of this application, a flue gas collection hood designed for use in the exhaust port area of ​​a high-temperature furnace used for preparing X-ray storage image plates can collect a mixture of iodine vapor and ammonia gas discharged from the high-temperature furnace. This facilitates the effective introduction of the mixed gas into a connected recovery device. The recovery device recovers the mixed gas. Inside the recovery device, water medium simultaneously contacts ammonia gas and iodine vapor, realizing a physical change process. Iodine vapor sublimates into iodine crystals, and ammonia gas dissolves to form ammonia water. Porous sponge strips are used to adsorb the iodine crystals formed after sublimation, thereby achieving effective separation and recovery of iodine vapor. Ammonia water gradually accumulates at the bottom of the recovery device under the action of gravity, thereby achieving effective separation and recovery of ammonia gas. The exhaust device discharges air from which iodine vapor and ammonia gas have been removed, ensuring that toxic and harmful gases are effectively removed and that air circulation is achieved.

[0044] Thus, the recovery device used in this embodiment of the invention can simultaneously separate and recover iodine vapor and ammonia, protecting the environment from pollution, safeguarding the physical and mental health of workers, and eliminating the BaF(Br,I):Eu 2+ The bottleneck in the preparation process of phosphors is the use of BaF(Br,I):Eu 2+ Phosphors provide technical support for the development of emerging technologies for IP boards.

[0045] This invention uses an aqueous medium to simultaneously separate and recover iodine vapor and ammonia, avoiding the use of organic solvents or other chemical reagents. The aqueous medium is inexpensive, readily available, and environmentally friendly, while also improving the safety of the processing and meeting the stringent requirements for green production in the IP board manufacturing industry.

[0046] The embodiments of the present invention use water as a medium to cool into iodine vapor and dissolved ammonia gas, which involves only physical changes. The water medium will not cause unwanted chemical reactions, and there is no need to recycle the new waste liquid formed by the reaction products, thereby reducing the side effects in the treatment process. It can be continuously recycled to ensure the continuous production of IP boards.

[0047] The recovery of iodine vapor and ammonia in this embodiment involves two coexisting and independent physical change processes, which can realize the automatic separation of iodine vapor and ammonia. It can achieve the recovery and separation of iodine vapor and ammonia simultaneously in a simple and efficient manner, reducing the requirements for complex chemical treatment. From a technical and environmental point of view, there is no need to set up an additional separation system, which reduces the complexity of the system and the investment cost, and has extremely high value.

[0048] The recycling system of this invention is easy to operate and maintain in the recycling environment. This system is suitable for production processes of various scales, from laboratory to industrial. The scale and design of the recycling device can be adjusted to adapt to the production scale of IP boards and improve the harsh laboratory environment.

[0049] The application of the iodine vapor and ammonia mixed gas recovery system in the field of X-ray storage image plate preparation has the same advantages as the iodine vapor and ammonia mixed gas recovery system described above has over the prior art, and thus will not be described here again. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the present application will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0051] Figure 1 is an assembly overall view of the iodine vapor and ammonia mixed gas recovery system and the high-temperature furnace according to an embodiment of the present application;

[0052] Figure 2 is a schematic view of the internal structure of the recovery device according to an embodiment of the present application;

[0053] Figure 3 is an overall view of the external structure of the recovery device according to an embodiment of the present application;

[0054] Figure 4 is a flow chart of the application of the iodine vapor and ammonia mixed gas recovery system in the field of X-ray storage image plate preparation according to another embodiment of the present application;

[0055] Figure 5 is a step flow chart of the gas recovery step according to another embodiment of the present application.

[0056] Explanation of reference signs:

[0057] 1, flue gas collection hood; 2, high-temperature furnace; 3, recovery device; 31, inlet; 32, outlet; 33, partition; 34, recovery box; 35, porous sponge strip; 4, exhaust device; 5, anti-overflow curtain; 6, pipeline. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0059] It should be noted that the BaF(Br, I):Eu 2+Light excitation fluorescent powder is a new technology, which can use BaF2, BaBr2, NH4I, NH4F, Eu2O3 as reaction raw materials, mix uniformly according to a certain molar ratio, grind, and then perform solid phase reaction in a high temperature furnace 2 (the furnace temperature is usually 600-800 DEG C). Under high temperature, the compounds in the raw materials will undergo solid phase reaction to obtain BaF(Br, I):Eu 2+ Fluorescent powder. Because the raw materials contain iodine source and ammonia source, iodine vapor and ammonia gas will be discharged from the exhaust port of the high temperature furnace 2, so that the laboratory environment has a stimulating odor, and purple smoke can be obviously seen near the furnace door, which is dangerous to the environment and personnel health.

[0060] In related gas recovery technologies, there is no technology that can simultaneously recover iodine vapor and ammonia gas, so the improvement of the production environment of the IP plate is still in the blank. And recovering iodine vapor and ammonia gas separately needs to design independent recovery systems for ammonia gas or iodine vapor, which undoubtedly increases the complexity and investment cost of the system, including equipment investment, operation and maintenance cost, etc.; the operating personnel need to manage and maintain two systems at the same time, which increases the complexity and labor intensity of the operation; meanwhile, multiple systems occupy a large space area and have high energy consumption; therefore, there are many challenges for the production of IP plate.

[0061] Therefore, the embodiment of the present application provides a mixed gas recovery system based on iodine vapor and ammonia gas, Figure 1 The assembly structure of the mixed gas recovery system and the high temperature furnace 2 according to some embodiments of the present disclosure is shown, Figure 2 And Figure 3 The example recovery device 3 according to some embodiments of the present disclosure is shown. Please combine Figures 1-3The system comprises a flue gas collecting hood 1, which is arranged on the area of the exhaust port of a high-temperature furnace 2, the high-temperature furnace 2 is characterized by a high-temperature furnace 2 for preparing an X-ray storage image plate, the exhaust port outputs mixed gas, the mixed gas comprises air carrying iodine vapor and ammonia gas; a recovery device 3 in communication with the flue gas collecting hood 1, the recovery device 3 is filled with a water medium; the water medium comprises an aqueous solution and / or water vapor; a porous adsorption mechanism arranged in the recovery device 3; the porous adsorption mechanism comprises at least one porous sponge strip 35, a plurality of the porous sponge strips 35 are arranged longitudinally and transversely in the recovery device 3; an exhaust device 4 in communication with the recovery device 3; wherein the exhaust device 4 discharges the mixed gas into the flue gas collecting hood 1 through the exhaust port, and then converges into the recovery device 3, the water medium contacts the iodine vapor to perform desublimation of the iodine vapor, so that the iodine vapor is converted into iodine crystals, the iodine crystals are adsorbed by the porous adsorption mechanism, at the same time, the water medium contacts the ammonia gas to perform dissolution of the ammonia gas, so that the ammonia gas is converted into ammonia water, and the air removing the iodine vapor and the ammonia gas is discharged from the recovery device 3 by the exhaust device 4, so as to realize recovery of the iodine vapor and the ammonia gas at the same time.

[0062] Specifically, the flue gas collecting hood 1 can be understood as a device for facilitating the capture of the mixed gas from the high-temperature furnace 2 and the introduction of the mixed gas into the recovery device 3 according to the structural characteristics of the used high-temperature furnace 2, for example, it can be a horn-shaped structure, the narrow mouth is communicated with the inlet 31 of the recovery device 3 through a pipeline 6, and the wide mouth is installed near the furnace port of the high-temperature furnace 2 to converge the mixed gas into the recovery device 3. More specifically, the inner edge shape profile should be adapted to the outer edge profile near the discharge port of the high-temperature furnace 2, and generally the high-temperature furnace 2 is a box-type high-temperature furnace 2, and the flue gas collecting hood 1 can be a horn-shaped prism structure.

[0063] In some embodiments, a spill-proof curtain 5 is installed on the four peripheral edges of the flue gas collecting hood 1. The spill-proof curtain 5 can be a cloth curtain, a plastic curtain, a rubber curtain or a metal curtain which is low in cost and easy to manufacture, and can prevent the mixed gas from leaking in the laboratory or factory workshop. In combination with the above embodiments, the exhaust fan can guide the mixed gas into the recovery device 3, and further in the implementation process, the spill-proof curtain 5 blocks the possibility of the mixed gas overflowing from the four peripheral edges of the flue gas collecting hood 1. The device can be detachably assembled with the high-temperature furnace 2 to be applicable to different models of high-temperature furnaces 2, thereby improving the application scenarios of the device. After long-term use, the BaF(Br, I):Eu 2+ There is no pungent smell in the room during the high-temperature sintering of the fluorescent powder, and no purple smoke is seen near the furnace door, which significantly improves the working environment in the field of IP plate preparation.

[0064] In this embodiment, the recovery device 3 can be located beside the high-temperature furnace 2, and the smoke collection hood 1 is located on the top of the high-temperature furnace 2, which can be communicated with the recovery device 3 by designing the path of the pipeline 6. Figure 1 As shown in the figure, the pipeline 6 communicates the smoke collection hood 1 and the recovery device 3 through two bends.

[0065] The water medium is filled in the recovery device 3. In some embodiments, the water medium can be an aqueous solution; in some embodiments, the water medium can be water vapor; in some embodiments, the water medium can be a mixture of aqueous solution and water vapor. When the high-temperature iodine vapor contacts the water medium, it will quickly condense into iodine crystals and be adsorbed by the porous adsorption mechanism, realizing the separation of iodine vapor from the mixed gas; ammonia gas is a gas that can be dissolved in water, while iodine vapor and air in the mixed gas are not soluble in water, and ammonia gas dissolved in water forms ammonium hydroxide, i.e. ammonia water, which is effectively removed from the mixed gas.

[0066] It can be understood that ammonia gas is a polar gas and is soluble in water; while iodine vapor is a non-polar gas and has very small solubility in water. Therefore, based on the unique physical properties of ammonia gas and iodine vapor, the invention utilizes the dissolution and condensation characteristics of water to interact with each other, while realizing the recovery of ammonia gas and iodine vapor, which is particularly suitable for environmental improvement in IP production process.

[0067] Water is a very environmentally friendly medium, harmless to the environment and human body, and is a low-cost and easily accessible resource. Using water medium not only realizes the simultaneous recovery of ammonia gas and iodine vapor, but also reduces the impact on the environment and improves the safety of the treatment process. Compared with using organic solvents or other chemical reagents to treat toxic and harmful gases, it will not produce undesirable chemical reactions, and does not need to set up additional equipment to further treat the newly generated waste liquid or waste gas, which is pollution-free to the environment and meets the principles of green chemistry.

[0068] Therefore, the overall system realizes multifunctional recovery with a simple structure, easy operation and low maintenance cost. The system is suitable for IP plate production processes of various scales, from laboratory scale to industrial scale, which can be adapted by adjusting the scale and design of the recovery system.

[0069] It can be known that in the traditional technology, if it is necessary to treat and separate the mixed gas containing ammonia gas and iodine vapor generated in the industrial process, an additional separation system usually needs to be set up. For example, different specific chemical absorbents are used to absorb the two gases respectively, and then the two absorbed products are separated; or the two waste gases need to be separated first, and then the corresponding medium is used to absorb each waste gas.

[0070] As a specific explanation of the present embodiment, another significant progress of the present application lies in the arrangement of the plurality of porous sponge strips 35 in the porous adsorption mechanism of the present application. The ammonia water freely settles to the bottom of the recovery device 3 under the action of gravity, while the porous sponge strips 35 have a porous structure that provides a large amount of surface area and pores capable of selectively adsorbing and fixing solid-state substances, so that the iodine crystals are adsorbed on the porous sponge strips 35. The porous sponge strips 35 are arranged in the space formed by the recovery device 3 and can be separated from the ammonia water at the bottom, so that the iodine crystals and the ammonia water are automatically preliminarily separated, facilitating subsequent recycling or complete removal. Thus, the structure of the present system is further simplified, the need for a complex separation system is reduced, and the investment cost, operating cost and running cost are further reduced.

[0071] Further, the longitudinal and horizontal arrangement of the plurality of porous sponge strips 35 in the recovery device 3 can comprehensively contact the area through which the mixed gas flows, maximizing the contact area between the porous sponge strips 35 and the sublimed iodine crystals, thereby improving the trapping efficiency of the iodine crystals, reducing the outflow of harmful gas from the outlet 32 of the recovery device 3, improving the safety of the working environment, and reducing the potential health risks.

[0072] In some embodiments, the arrangement can be that a plurality of porous sponge strips 35 are placed in parallel to form a series of parallel strips; in some embodiments, the plurality of porous sponge strips 35 are arranged in a cross-like manner, similar to a grid or arranged in a grid-like structure; in some embodiments, the plurality of porous sponge strips 35 are stacked into multiple layers, each layer can have different directions or densities; in some embodiments, the plurality of porous sponge strips 35 are fixed in a spiral shape or thread-like manner; in some embodiments, the plurality of porous sponge strips 35 are arranged radially from the center to the periphery.

[0073] In any of the above arrangements, the porous sponge strips 35 should be staggered with the inlet 31 and the outlet 32 of the recovery device 3.

[0074] It can be understood that the mixed gas discharged from the exhaust port refers to air carrying ammonia gas and iodine vapor. The exhaust device 4 can be in communication with the outlet 32 of the recovery device 3 through the pipeline 6 to discharge the harmless air from which the ammonia gas and the iodine vapor have been removed from the recovery device 3, so as to achieve air circulation in the recovery device 3. At the same time, the exhaust device 4 generates suction force to guide the mixed gas discharged from the exhaust port to collect into the flue gas collecting hood 1.

[0075] In some embodiments, the exhaust device 4 can be an exhaust fan.

[0076] The embodiment is used to further illustrate the recovery system. The water medium is water vapor; the recovery system further comprises a water mist generator located in the recovery device 3 to generate water vapor filled in the recovery device 3. In this embodiment, the water mist generator can be an ultrasonic atomizer, which can convert water into tiny water droplets or water vapor in the form of water mist. The water vapor in the recovery device 3 is uniformly distributed in the entire recovery device 3, which has a high surface area to volume ratio, so that the water medium can have higher desublimation efficiency and dissolution efficiency when contacting with the mixed gas.

[0077] In combination with the above embodiment, the porous sponge strip 35 is located in the space of the recovery device 3 and separated from the bottom, and the water vapor can be filled in the space of the recovery device 3, so that the iodine vapor directly desublimates in the space of the recovery device 3 and is adsorbed by the porous sponge strip 35 to separate from the ammonia water.

[0078] Among them, the size, density and spraying range of water vapor can be flexibly adjusted according to needs, and the whole system control mode is simple.

[0079] In order to further improve the automatic separation effect of iodine crystals and ammonia water, the bottom of the recovery device 3 is provided with a recovery box 34, and each porous sponge strip 35 has a distance from the recovery box 34. In this embodiment, the recovery box 34 can be a box structure with an open top, and is movably arranged at the bottom of the recovery device 3. The ammonia water will eventually accumulate in the recovery box 34 due to the action of gravity. After the production process is completed, the recovery box 34 can be opened from the recovery device 3 to observe the ammonia water collection or completely remove the ammonia water, and the recovery device 3 is in a closed state when the recovery box 34 is closed.

[0080] In combination with the above embodiment, each porous sponge strip 35 has a distance from the recovery box 34, which can be understood that the bottommost porous sponge strip 35 is still located above the recovery box 34, realizing the direct deep separation of the adsorbed iodine crystals and ammonia water, reducing the mixing degree of the two, and facilitating the subsequent recycling or complete removal.

[0081] It needs to be explained that in the field of IP plate production, BaF(Br, I):Eu 2+ The amount of ammonia gas and iodine vapor overflow generated during the preparation of the fluorescent powder is very small. After the production of one kilogram of fluorescent powder is completed, about 1-5 mg of iodine crystals or 1-5 ml of ammonia water can be recovered, so the recovery box 34 can be cleaned or the porous sponge strip 35 can be replaced after one year.

[0082] In a further technical solution, the recovery device 3 is further provided with: a plurality of partitions 33, each pair of partitions 33 forming an adsorption channel, the adsorption channel being configured to extend the length of the flow path of the mixed gas in the recovery device 3; and wherein, at least a portion of each adsorption channel is fitted with a porous sponge strip 35.

[0083] In this embodiment, multiple baffles 33 can be fixedly connected inside the recovery device 3, dividing the recovery device 3 into multiple spaces, thus forming an adsorption channel. This allows the mixed gas entering the recovery device 3 from the inlet 31 to flow along the walls of the multiple baffles 33 near the inlet 31 and disperse to other areas. In the direction from the inlet 31 to the outlet 32 ​​of the recovery device 3, it can continue to flow along the walls of other baffles 33, extending the contact time between the mixed gas and water vapor, and further ensuring the cleanliness of the air discharged from the outlet 32 ​​of the recovery device 3.

[0084] Meanwhile, porous sponge strips 35 are set in multiple adsorption channels, which can provide installation space for the porous sponge strips 35, make full use of the limited space in the recovery device 3, and adsorb iodine crystals formed by the sublimation of iodine vapor in the mixed gas flowing near the wall of the partition 33.

[0085] In some embodiments, the partition may have multiple micropores.

[0086] The arrangement of the multiple adsorption channels can refer to the arrangement of the multiple porous sponge strips 35. However, the size of each adsorption channel can be larger than the size of the porous sponge strip 35 within the corresponding channel. For example, when multiple adsorption channels are evenly spaced and parallel along the length of the recovery device 3, the width and length of the porous sponge strip 35 within each adsorption channel can be the same as the width of the adsorption channel, but its height can be less than the height of the adsorption channel.

[0087] Please see Figure 4 As shown, Figure 4 This is a flowchart illustrating the application of a mixed gas recovery system based on iodine vapor and ammonia in the fabrication of X-ray storage imaging plates. Figure 4 As shown, this invention also proposes an application of the mixed gas recovery system based on iodine vapor and ammonia, as described above, in the field of X-ray storage image plate fabrication. The application process includes:

[0088] S11, gas recovery step; and,

[0089] S12, X-ray storage image plate preparation steps;

[0090] Step S12 includes:

[0091] S121, selecting reaction raw materials and placing the reaction raw materials in the high-temperature furnace 2, and synthesizing BaF(Br, I):Eu in the high-temperature furnace 2 by using a solid phase method 2+ The phosphor generates iodine vapor and ammonia gas during a sintering process and discharges the iodine vapor and the ammonia gas from an exhaust port of the high-temperature furnace along with air;

[0092] The BaF(Br, I):Eu 2+ The phosphor is coated as a phosphor layer of an X-ray storage image plate;

[0093] In the embodiment, BaF2, BaBr2, and Eu2O3 are used as dopants, NH4I and NH4F are used as reaction raw materials, the reaction raw materials are mixed uniformly at a certain molar ratio, and are then ground, and then a solid phase reaction is performed in the high-temperature furnace 2 (the temperature in the furnace is generally 600-800 ℃). At a high temperature, the compounds in the raw materials undergo a solid phase reaction to obtain BaF(Br, I):Eu 2+ The phosphor. The obtained phosphor is mixed with an adhesive, is coated on a substrate of a certain thickness, and forms an IP plate, and the phosphor forms a core functional layer, that is, a phosphor layer.

[0094] Please refer to Figure 5 , Figure 5 is a step flow chart of a gas recovery step of the present application. In the step S11, the following steps are included:

[0095] S111, inputting the mixed gas discharged from the exhaust port in the preparation step into the flue gas collecting hood 1;

[0096] S112, converging the mixed gas into the recovery device 3 by using the flue gas collecting hood 1;

[0097] S113, contacting the iodine vapor with the water medium in the recovery device 3 to perform desublimation of the iodine vapor to obtain iodine crystals;

[0098] S114, adsorbing the iodine crystals by using a porous adsorption mechanism;

[0099] S115, contacting the ammonia gas with the water medium in the recovery device 3 to perform dissolution of the ammonia gas to obtain ammonia water;

[0100] S116, discharging the air from which the iodine vapor and the ammonia gas are removed from the recovery device 3 by using an exhaust device 4 to simultaneously recover the iodine vapor and the ammonia gas.

[0101] Further, the step S11 further includes:

[0102] S117, generating water vapor in the recovery device 3 by using a water mist generator.

[0103] Further, the step S11 further includes:

[0104] S118, collecting the ammonia water in the recovery box 34 at the bottom of the recovery device 3;

[0105] S119, adsorbing the iodine crystals in other areas of the recovery device 3 except the bottom.

[0106] Further, step S111 includes:

[0107] S120, after the mixed gas flows into the recovery device 3, the mixed gas is divided into the adsorption channels formed by the partitions 33;

[0108] S122, the porous adsorption sponge strips in each adsorption channel adsorb the iodine crystals formed by the condensation of the iodine vapor flowing through the porous adsorption sponge strips.

[0109] Further, step S111 includes:

[0110] S1111, during the process of discharging the mixed gas into the flue gas collecting hood 1, the anti-overflow curtain 5 is used to block the mixed gas from flowing out of the gap between the exhaust port and the flue gas collecting hood 1.

[0111] It should be noted that, for the method embodiments, in order to simply describe, they are all described as a series of action combinations, but those skilled in the art should know that the embodiments of the present application are not limited to the action order described, because according to the embodiments of the present application, certain steps can be performed in other order or at the same time. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions involved are not necessarily the ones that the embodiments of the present application must have.

[0112] For the method embodiments, since they are basically similar to the system embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the system embodiments.

[0113] It should be noted that each of the embodiments in the specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other.

[0114] It should also be noted that, in this article, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations, nor can it be understood as indicating or implying relative importance. Moreover, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or further includes elements inherent to such a process, method, article or terminal device.

[0115] The above provides a kind of based on iodine vapor and ammonia gas recovery system and application of mixed gas based on the application, have carried out detailed introduction, the principle and implementation mode of the present application are described in this article by specific examples, the above example is only for helping to understand the present application, the content of the specification should not be understood as limiting the present application. Meanwhile, for those skilled in the art, according to the present application, there will be different forms of change in specific implementation and application range, here need not and cannot exhaust all the implementation ways, and the obvious changes or changes derived from it are still within the protection scope of the present application.

Claims

1. A mixed gas recovery system based on iodine vapor and ammonia gas, characterized by, The application relates to a smoke collection hood and a recovery system. The smoke collection hood is arranged in a region where an exhaust port of a high-temperature furnace is located, the high-temperature furnace is characterized by a high-temperature furnace for preparing an X-ray storage image plate, the exhaust port outputs mixed gas, and the mixed gas comprises air carrying iodine vapor and ammonia gas. The recovery system is in communication with the smoke collection hood, and a water medium is filled in the recovery system; the water medium comprises a water solution and / or water vapor. A porous adsorption mechanism is arranged in the recovery system; the porous adsorption mechanism comprises at least one porous sponge strip, and a plurality of the porous sponge strips are arranged in the recovery system. An exhaust device is in communication with the recovery system. The exhaust device discharges the mixed gas into the smoke collection hood through the exhaust port, and then the mixed gas flows into the recovery system, the water medium contacts the iodine vapor to perform desublimation of the iodine vapor, the iodine vapor is converted into iodine crystals, the iodine crystals are adsorbed by the porous adsorption mechanism, the water medium contacts the ammonia gas to perform dissolution of the ammonia gas, the ammonia gas is converted into ammonia water, the air removing the iodine vapor and the ammonia gas is discharged from the recovery system by the exhaust device, and the iodine vapor and the ammonia gas are recovered at the same time.

2. The system for recovering a mixed gas of iodine vapor and ammonia gas according to claim 1, wherein The water medium is water vapor; and the recovery system further comprises a water mist generator arranged in the recovery system to generate water vapor filled in the recovery system. The bottom of the recovery device is provided with a recovery box, and each porous sponge strip has a distance from the recovery box.

3. The system for recovering a mixed gas of iodine vapor and ammonia gas according to claim 1, wherein The recovery device is further provided with a plurality of partitions, each two of the partitions form an adsorption channel, the adsorption channel is configured to prolong the length of a flow path of the mixed gas in the recovery device, and at least a partial region in each adsorption channel is one-to-one corresponding to the installation of the porous sponge strip.

4. The system for recovering a mixed gas of iodine vapor and ammonia gas according to claim 1, wherein A spill-proof curtain is arranged on the periphery edge of the smoke collection hood. The application process comprises an X-ray storage image plate preparation step and a gas recovery step. The X-ray storage image plate preparation step comprises:

5. The system for recovering a mixed gas of iodine vapor and ammonia gas according to claim 1, wherein The gas recovery step comprises:

6. Use of the mixed gas recovery system based on iodine vapor and ammonia gas according to any one of claims 1 to 5 in the field of preparation of X-ray storage panels, characterized in that, The mixed gas discharged from the exhaust port in the preparation step is input into the smoke collection hood; The mixed gas is converged into the recovery system by the smoke collection hood; The reaction raw material is selected and placed in a high-temperature furnace, and BaF(Br, I):Eu is synthesized in the high-temperature furnace by a solid phase method 2+ The fluorescent powder generates iodine vapor and ammonia gas during the sintering process and is discharged from the exhaust port of the high-temperature furnace together with air; The BaF(Br, I):Eu 2+ The phosphor layer is coated on the X-ray storage image plate. The iodine vapor contacts the water medium in the recovery system to perform desublimation of the iodine vapor, and iodine crystals are obtained; The iodine crystals are adsorbed by the porous adsorption mechanism; The ammonia gas contacts the water medium in the recovery system to perform dissolution of the ammonia gas, and ammonia water is obtained; The air removing the iodine vapor and the ammonia gas is discharged from the recovery system by the exhaust device, and the iodine vapor and the ammonia gas are recovered at the same time. The gas recovery step further comprises: Water vapor is generated in the recovery system by the water mist generator. The gas recovery step further comprises:

7. Use of the mixed gas recovery system based on iodine vapor and ammonia gas according to claim 6 in the field of preparation of X-ray storage panels, characterized in that, The ammonia water is collected in the recovery box at the bottom of the recovery device; The iodine crystals are adsorbed in other regions of the recovery device except the bottom.

8. Use of the mixed gas recovery system based on iodine vapor and ammonia gas according to claim 7 in the field of preparation of X-ray storage panels, characterized in that, After the mixed gas is converged into the recovery system by the smoke collection hood, the mixed gas flows into the recovery device and is branched to the adsorption channels formed by the partitions. ​ ​ 9. Use of the mixed gas recovery system based on iodine vapor and ammonia gas according to claim 8 in the field of preparation of X-ray storage panels, characterized in that, ​ ​ The porous adsorption sponge strips in each of the adsorption channels adsorb the iodine crystals sublimed from the iodine vapor flowing through.

10. Use of the mixed gas recovery system based on iodine vapor and ammonia gas according to claim 6 in the field of preparation of X-ray storage panels, characterized in that, The process of inputting the mixed gas discharged from the exhaust port in the preparation step into the flue gas collecting hood comprises: In the process of discharging the mixed gas into the flue gas collecting hood, an anti-overflow curtain is used to block the mixed gas from flowing out of the gap between the exhaust port and the flue gas collecting hood.

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