Precious metal recovery device for dilute platinum nitrate net
By designing a precious metal recycling device for dilute nitric acid production, the problem of loss of precious metal particles in the platinum network is solved, and continuous recycling of precious metals and production costs are achieved.
Patent Information
- Application Number
- CN202422024287.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-20
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-20
AI Technical Summary
During the dilute nitric acid production process, the precious metal particles of the platinum mesh fall off and lose due to the decline in mechanical strength, resulting in economic losses and increased production costs.
A precious metal recovery device for dilute platinum nitrate mesh is designed, including a baffle, a guide cover, an exhaust pipe and a filter material. The metal particles in the nitrogen oxide gas are filtered through the filter material. The gas is discharged through the bent part and the transverse part. When the device stops and replaces the platinum mesh, the filter element is simultaneously replaced to recover precious metals.
The continuous recycling of precious metals in the platinum mesh during dilute nitric acid production process is achieved, reducing production costs and improving the purity of the recovered metals.
Smart Images
Figure CN223042358U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of dilute nitric acid production, in particular to a precious metal recovery device for platinum mesh in dilute nitric acid. Background Technique
[0002] At present, most domestic dilute nitric acid production enterprises adopt the double-pressure production process, that is, gaseous ammonia undergoes an oxidation reaction with oxygen under low pressure to generate nitrogen oxide gas (using a precious metal catalyst of platinum-rhodium-palladium ternary platinum mesh), and the nitrogen oxide gas is pressurized by a compressor and then absorbed in an absorption tower to form dilute nitric acid. During the nitric acid production process, the platinum mesh is laid flat in layers in the catalyst basket of the oxidation furnace and is in an environment of high temperature, high load, and gas flow blowing for a long time. Its mechanical strength will gradually decline with the increase of service time, resulting in the shedding and loss of precious metal particles of the platinum mesh. If the shed precious metal particles are not collected, this part of precious metal will be lost in the subsequent process pipeline equipment, bringing economic losses to the enterprise and also increasing the production cost of dilute nitric acid. Therefore, a precious metal recovery device for platinum mesh in dilute nitric acid is proposed for the above problems. Content of the Utility Model
[0003] The purpose of the utility model is to provide a precious metal recovery device for platinum mesh in dilute nitric acid to solve the problems raised in the above background technique.
[0004] To achieve the above purpose, the utility model provides the following technical solutions:
[0005] As an optional scheme of a precious metal recovery device for platinum mesh in dilute nitric acid described in the utility model, wherein: a precious metal recovery device for platinum mesh in dilute nitric acid includes a baffle, a guiding cover, and an exhaust pipe,
[0006] A guiding cover is fixedly connected inside the baffle, an exhaust pipe is fixedly connected in the center of the guiding cover, a connecting pipe is communicated on one side of the exhaust pipe, a plurality of bending parts are installed on the outer side of the connecting pipe, and the other ends of the bending parts are fixedly connected with transverse parts, and the other ends of the transverse parts are hermetically arranged;
[0007] The outer sides of the bending parts and the transverse parts are both wound with laminated filter materials;
[0008] A shell is also fixedly connected to the outer side of the baffle, and an air inlet joint is communicated with the outer side of the shell.
[0009] At present, most domestic dilute nitric acid production enterprises adopt the double-pressure production process. That is, gaseous ammonia undergoes an oxidation reaction with oxygen at low pressure to generate nitrogen oxide gas. The nitrogen oxide gas is then pressurized by a compressor and absorbed in an absorption tower to form dilute nitric acid. During the nitric acid production process, the platinum mesh is laid flat in layers in the catalyst basket of the oxidation furnace and is in a high-temperature and high-load environment with gas purging for a long time. Its mechanical strength will gradually decline with the increase in the usage time, resulting in the shedding and loss of precious metal particles of the platinum mesh. If the shed precious metal particles are not collected, this part of the precious metal will be lost in the subsequent process pipelines and equipment, bringing economic losses to the enterprise and also increasing the production cost of dilute nitric acid. When in use, the nitrogen oxide gas generated by the oxidation furnace reaction is cooled by a heat exchanger, and then a precious metal recovery device is installed after the heat exchanger to recover the precious metal particles of the platinum mesh in the nitrogen oxide gas and reduce the production cost. The specific process is that the mixed gas such as the nitrogen oxide gas to be filtered enters the interior of the housing through the exhaust pipe, and then is filtered through the filter material. The metal particles adhere to the surface of the filter material, and the gas enters the interior through the through holes on the surfaces of the transverse part and the bending part, and then is discharged through the connecting pipe and the exhaust pipe. When the dilute nitric acid device stops to replace the platinum mesh, a new filter element is synchronously replaced, and the precious metal particles in the old filter element are recovered to continuously recover the precious metal lost from the platinum mesh of the oxidation furnace during the production process of dilute nitric acid.
[0010] As an alternative solution of a precious metal recovery device for platinum mesh of dilute nitric acid according to the present utility model, wherein: the exhaust pipe penetrates through the left and right end faces of the guiding cover, and the exhaust pipe is hollow.
[0011] This setting can ensure that the gas is discharged smoothly after being filtered, ensuring the normal use of the equipment.
[0012] As an alternative solution of a precious metal recovery device for platinum mesh of dilute nitric acid according to the present utility model, wherein: the housing is made of stainless steel plate.
[0013] This setting can prevent rust from appearing on the housing during long-term use, avoid rust impurities from falling into the interior, and improve the purity of the recovered metal.
[0014] As an alternative solution of a precious metal recovery device for platinum mesh of dilute nitric acid according to the present utility model, wherein: the filter material is made of a three-in-one composite high-efficiency filter material.
[0015] This setting can have a better filtering effect and ensure the stable recovery of metal particles.
[0016] As an alternative solution of a precious metal recovery device for platinum mesh of dilute nitric acid according to the present utility model, wherein: through holes are uniformly distributed on the outer sides of the bending part and the transverse part.
[0017] This setting ensures that the gas can smoothly enter its interior through the through-holes, ensuring the smooth discharge of the gas.
[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0019] When the present utility model is in use, the mixed gas such as nitrogen oxide gas to be filtered enters the interior of the housing through the intake joint, and then is filtered by the filter material. The metal particles adhere to the surface of the filter material. The gas enters the interior through the through-holes on the surfaces of the transverse part and the bent part, and then is discharged through the connecting pipe and the exhaust pipe. When the platinum mesh of the dilute nitric acid device is stopped for replacement, a new filter element is synchronously replaced, and the precious metal particles in the old filter element are recycled, realizing the continuous recovery of the precious metals lost by the platinum mesh in the oxidation furnace during the production process of dilute nitric acid. Description of the Drawings
[0020] Figure 1 is a schematic diagram of the overall structure of the present utility model;
[0021] Figure 2 is a cross-sectional view of the transverse part of the present utility model.
[0022] In the figure: 1, baffle; 2, guide cover; 3, exhaust pipe; 4, connecting pipe; 5, bent part; 6, transverse part; 7, filter material; 8, housing; 9, intake joint. Detailed Embodiments
[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0024] Embodiment 1
[0025] Please refer to Figure 1 and Figure 2 , the present utility model provides a technical solution:
[0026] A precious metal recovery device for platinum mesh in dilute nitric acid, comprising a baffle 1, a guide cover 2 and an exhaust pipe 3,
[0027] The inside of the baffle 1 is fixedly connected with a guide cover 2, the center of the guide cover 2 is fixedly connected with an exhaust pipe 3, one side of the exhaust pipe 3 is communicated with a connecting pipe 4, a plurality of bent parts 5 are installed on the outer side of the connecting pipe 4, and the other ends of the bent parts 5 are fixedly connected with a transverse part 6, and the other end of the transverse part 6 is hermetically arranged;
[0028] The outer sides of the above-mentioned bent portion 5 and the transverse portion 6 are both wound with laminated filter materials 7;
[0029] A housing 8 is further fixedly connected to the outer side of the above-mentioned baffle 1, and an air inlet joint 9 is communicated with the outer side of the above-mentioned housing 8.
[0030] At present, most domestic dilute nitric acid production enterprises adopt the double-pressure production process, that is, gaseous ammonia undergoes an oxidation reaction with oxygen at low pressure to generate nitrogen oxide gas using a platinum-rhodium-palladium ternary platinum mesh noble metal catalyst. The nitrogen oxide gas is then pressurized by a compressor and absorbed in an absorption tower to form dilute nitric acid. During the nitric acid production process, the platinum mesh is laid flat in layers in the catalyst basket of the oxidation furnace and is in a high-temperature and high-load environment with gas flow blowing for a long time. Its mechanical strength will gradually decline with the increase of the service time, resulting in the shedding and loss of platinum mesh noble metal particles. If the shed noble metal particles are not collected, this part of the noble metal will be lost in the subsequent process pipelines and equipment, bringing economic losses to the enterprise and also increasing the production cost of dilute nitric acid. When in use, the nitrogen oxide gas generated by the oxidation furnace reaction is cooled by a heat exchanger, and then a noble metal recovery device is installed after the heat exchanger to recover the platinum mesh noble metal particles in the nitrogen oxide gas and reduce the production cost. The specific process is that the mixed gas such as the nitrogen oxide gas to be filtered enters the interior of the housing 8 through the exhaust pipe 9, and then is filtered through the filter material 7. The metal particles adhere to the surface of the filter material 7, and the gas enters the interior through the through holes on the surfaces of the transverse portion 6 and the bent portion 5, and then is discharged through the connecting pipe 4 and the exhaust pipe 3. When the dilute nitric acid device stops to replace the platinum mesh, a new filter element is replaced synchronously, and the noble metal particles in the old filter element are recovered, realizing the continuous recovery of the noble metal lost from the platinum mesh of the oxidation furnace during the dilute nitric acid production process, reducing the production cost. The filter material 7 has a large filtration area, a small pressure drop, and a high recovery rate.
[0031] Example 2
[0032] This embodiment is an improvement made to Example 1. Please refer to Figure 1 , specifically, the above-mentioned exhaust pipe 3 penetrates through the left and right end faces of the guiding cover 2, and the above-mentioned exhaust pipe 3 is hollow.
[0033] This setting can ensure that the gas is discharged smoothly after being filtered, ensuring the normal use of the equipment.
[0034] Example 3
[0035] This embodiment is an improvement made to Example 2. Please refer to Figure 1 , specifically, the above-mentioned housing 8 is made of stainless steel plate.
[0036] This setting can prevent the housing 8 from rusting during long-term use, avoid the rust impurities from falling into the interior, and improve the purity of the recovered metal.
[0037] Example 4
[0038] This example is an improvement on Example 3. Please refer to Figure 1 , specifically, the above-mentioned filter material 7 is made of a three-in-one composite high-efficiency filter material.
[0039] This setting can have a better filtering effect to ensure the stable recovery of metal particles. This material is a new type of high-temperature filter material with a three-dimensional pore structure that is reasonable in structure and excellent in performance. It has a high porosity, low resistance, and a dust removal efficiency about twice that of fabric filters. It is suitable for the high-temperature flue gas filtration in industries such as chemical engineering, iron and steel, metallurgy, coal-fired boilers, refractory materials, and cement. After long-term tests of high temperature and corrosive media, it has excellent performance, effectively filters dust pollution, recovers valuable fine particle products, and purifies gas at the same time, improving the quality of nitric acid, nitrate and their related products.
[0040] Example 5
[0041] This example is an improvement on Example 4. Please refer to Figure 1 , specifically, through holes evenly distributed are provided on the outer sides of the above-mentioned bending part 5 and transverse part 6.
[0042] This setting ensures that gas can smoothly enter its interior through the through holes and ensures the smooth discharge of gas.
[0043] It should be noted that in this article, 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 actual relationship or order between these entities or operations. Moreover, the term "comprises", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.
[0044] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A dilute nitric acid platinum mesh precious metal recovery device, characterized in that: It comprises a baffle (1), a guide cover (2) and an exhaust pipe (3), The baffle (1) is fixedly connected to a guide cover (2) inside, the guide cover (2) is fixedly connected to an exhaust pipe (3) at the center, one side of the exhaust pipe (3) is connected to a connecting pipe (4), a plurality of curved portions (5) are installed on the outside of the connecting pipe (4), and the other ends of the curved portions (5) are fixedly connected to a transverse portion (6), and the other end of the transverse portion (6) is sealed; The outer sides of the curved portion (5) and the transverse portion (6) are both wound with a laminated filter material (7); The outer side of the baffle (1) is also fixedly connected to a shell (8), and the outer side of the shell (8) is connected to an air intake connector (9).
2. A dilute nitric acid platinum mesh precious metal recovery device according to claim 1, characterized in that: The exhaust pipe (3) passes through the left and right end surfaces of the guide cover (2), and the exhaust pipe (3) is hollow.
3. A dilute nitric acid platinum mesh precious metal recovery device according to claim 1, characterized in that: The housing (8) is made of stainless steel plate.
4. A dilute nitric acid platinum mesh precious metal recovery device according to claim 1, characterized in that: The filter material (7) is made of three-in-one composite high-efficiency filter material.
5. A dilute nitric acid platinum mesh precious metal recovery device according to claim 1, characterized in that: The outer sides of the curved portion (5) and the transverse portion (6) are both provided with evenly distributed through holes.