Tail gas treatment device for copper nitrate production

Abstract

The utility model discloses a tail gas treatment device for copper nitrate production belongs to chemical equipment technical field. The utility model discloses including the reaction unit and tail gas treatment unit of interconnection, the reaction unit includes the copper nitrate reation kettle of setting up the feeding port, and the copper nitrate reation kettle is connected with nitric acid feed pipe, and the tail gas recovery treatment system includes the first stage tail gas absorption tower from the copper nitrate reation kettle, and the second stage tail gas absorption tower from the first stage tail gas absorption tower, the first stage tail gas absorption tower is connected with the pure oxygen storage tank, and the first stage tail gas absorption tower is connected with nitric acid recovery storage tank, and the second stage tail gas absorption tower is connected with the second stage tail gas absorption tower and adds the brine pipe of desalting, and the second stage tail gas absorption tower is connected with the tail gas discharge pipe. The utility model has realized the automation, green and high efficiency production of copper nitrate. While improving product purity and yield, the resource utilization of byproduct and near zero emission of waste gas are realized, and have the comprehensive advantage of low operating cost, environment friendly.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, specifically relating to a tail gas treatment device for copper nitrate production. Background Technology

[0002] Copper nitrate, with the molecular formula Cu(NO3)2 and CAS number 3251-23-8, is an important inorganic chemical raw material. It is a blue crystalline solid widely used in electroplating, pigment manufacturing, and catalyst preparation. Especially with the increasing demand for copper-based catalysts from the new energy and environmental protection industries, the market demand for high-quality copper nitrate is growing rapidly.

[0003] Currently, the classic method for industrial production of copper nitrate involves reacting high-purity electrolytic copper with concentrated nitric acid. While this method is direct, it generates large amounts of toxic nitrogen oxides (NOx, such as NO2 and NO) during the reaction. These gases are major pollutants contributing to acid rain and photochemical smog and must undergo strict treatment before being released.

[0004] To address this environmental problem, existing technologies generally incorporate alkaline absorption systems (such as those using NaOH solution) to neutralize the exhaust gas. However, this method merely transfers gaseous pollutants to the liquid phase, generating high-salt wastewater containing nitrite and nitrate. The subsequent treatment of this wastewater is complex and costly, resulting in secondary pollution. Furthermore, the valuable nitric acid feedstock used in this process is not efficiently utilized for product synthesis; instead, it is largely consumed in pollutant generation, leading to persistently high raw material costs and end-of-pipe treatment costs.

[0005] Therefore, there is an urgent need in this field to develop a new green production device for copper nitrate that can suppress or eliminate pollutant generation at the source of the reaction while improving atom economy, so as to meet increasingly stringent environmental protection requirements and reduce overall production costs. Utility Model Content

[0006] The purpose of this invention is to provide a tail gas treatment device for copper nitrate production, which not only ensures the high efficiency and stability of the copper nitrate production process, the resource utilization of by-products, and near-zero emissions of waste gas, but also has significant advantages in terms of low cost and environmental friendliness.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model discloses a tail gas treatment device for copper nitrate production, which includes a reaction unit and a tail gas treatment unit connected to each other. The reaction unit includes a copper nitrate reactor equipped with a feeding port, and the copper nitrate reactor is connected to a nitric acid feed pipe; The exhaust gas recovery and treatment system includes a primary exhaust gas absorption tower connected to the copper nitrate reactor, and a secondary exhaust gas absorption tower connected to the primary exhaust gas absorption tower; the primary exhaust gas absorption tower is connected to a pure oxygen storage tank, and the primary exhaust gas absorption tower is connected to a nitric acid recovery storage tank; the secondary exhaust gas absorption tower is connected to a secondary exhaust gas absorption tower demineralized water supply pipe, and the secondary exhaust gas absorption tower is connected to an exhaust gas emission pipe.

[0008] In some embodiments of this utility model, the reaction unit further includes a nitric acid metering tank connected to the copper nitrate reactor. The nitric acid metering tank is connected to the copper nitrate reactor via a nitric acid feed pipe, and a valve is provided on the nitric acid feed pipe.

[0009] In some embodiments of this utility model, the reaction unit further includes a copper nitrate storage device connected to the copper nitrate reactor. The copper nitrate storage device includes a copper nitrate tank and a copper nitrate transfer pipe connected to the copper nitrate tank from the copper nitrate reactor. A liquid pump is provided on the copper nitrate transfer pipe.

[0010] In some embodiments of this utility model, a heater is provided inside the copper nitrate reactor, and a cooling device is provided on the outer wall of the copper nitrate reactor; the cooling device includes a jacket provided on the outer wall of the copper nitrate reactor, and a cooling water inlet pipe is connected to the jacket and a cooling water outlet pipe is connected out. The copper nitrate reactor is connected to a circulation pipe, which is equipped with a circulating liquid pump.

[0011] In some embodiments of this utility model, a tail gas conveying pipe is connected between the copper nitrate reactor and the primary tail gas absorption tower, and a tail gas fan is installed on the tail gas conveying pipe. A pure oxygen storage tank is connected to the tail gas conveying pipe between the tail gas fan and the primary tail gas absorption tower through a pipeline.

[0012] In some embodiments of this utility model, a primary tail gas absorption tower circulation pipe is connected between the outlet of the primary tail gas absorption tower and the tail gas conveying pipe, and a secondary tail gas absorption tower circulation pipe is connected between the outlet of the secondary tail gas absorption tower and the primary tail gas absorption tower circulation pipe.

[0013] In some embodiments of this utility model, a primary tail gas absorption tower is connected to a primary tail gas absorption tower circulating liquid pipe, a primary circulating liquid pump is installed on the primary tail gas absorption tower circulating liquid pipe, and a nitric acid recovery storage tank is connected to the outlet pipe of the primary circulating liquid pump.

[0014] In some embodiments of this utility model, a secondary tail gas absorption tower is connected to a secondary tail gas absorption tower circulating liquid pipe, a secondary circulating liquid pump is provided on the secondary tail gas absorption tower circulating liquid pipe, and a primary tail gas absorption tower makeup liquid pipe is connected between the outlet of the primary circulating liquid pump and the outlet of the secondary circulating liquid pump.

[0015] In some embodiments of this utility model, a primary cooler is provided on the circulating liquid pipe of the primary tail gas absorption tower, and a secondary cooler is provided on the circulating liquid pipe of the secondary tail gas absorption tower.

[0016] In some embodiments of this utility model, an oxygen delivery pipe is connected between the pure oxygen storage tank and the tail gas delivery pipe, and a valve is provided on the oxygen delivery pipe. A nitric acid recovery pipe is connected between the nitric acid recovery storage tank and the outlet of the primary circulating liquid pump, and a valve is installed on the nitric acid recovery pipe. The outlet of the primary exhaust gas absorption tower and the inlet of the secondary exhaust gas absorption tower are connected by an exhaust gas delivery pipe for the primary exhaust gas absorption tower.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention features a scientifically designed and ingeniously conceived system. Through the efficient synergy between the reaction unit and the exhaust gas treatment unit, it achieves automated, green, and high-efficiency production of copper nitrate. While improving product purity and yield, it also realizes the resource utilization of by-products and near-zero emissions of waste gas, offering comprehensive advantages such as low operating costs and environmental friendliness.

[0018] Specifically, the reaction unit achieves full automation and closed-loop transportation from raw material feeding to product output, significantly improving production efficiency and operational stability. Precise control of key process parameters such as reaction temperature and material mixing effectively ensures high product purity and high yield. The exhaust gas treatment unit efficiently purifies harmful components, meeting ultra-low emission requirements, and recovers byproducts into usable nitric acid, achieving resource recycling.

[0019] This invention reduces raw material and energy consumption and enhances the value-added recovery capability of by-products through systematic optimization of the process flow, thereby significantly reducing overall production and operating costs. Attached Figure Description

[0020] Appendix Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] The names corresponding to the attached figure labels are: 1-Nitric acid metering tank, 2-Copper nitrate reactor, 3-Pure oxygen storage tank, 4-First-stage tail gas absorption tower, 5-Second-stage tail gas absorption tower, 6-Nitric acid recovery storage tank, 7-Circulating liquid pump, 8-Tail gas fan, 9-First-stage circulating liquid pump, 10-Second-stage circulating liquid pump, 11-Nitric acid feed pipe, 12-Ring pipe, 13-Tail gas conveying pipe, 14-Oxygen conveying pipe, 15-First-stage tail gas absorption tower tail gas conveying pipe, 16-First-stage tail gas absorption tower circulating liquid pipe, 17-Nitric acid recovery pipe, 18- 19-Secondary tail gas absorption tower replenishment pipe; 20-Secondary tail gas absorption tower circulating liquid pipe; 21-Secondary tail gas absorption tower demineralized water replenishment pipe; 22-Tail gas discharge pipe; 23-Liquid pump; 24-Copper nitrate storage tank; 25-Copper nitrate transfer pipe; 26-Secondary tail gas absorption tower circulating gas pipe; 27-Primary tail gas absorption tower circulating gas pipe; 28-Cooling water inlet pipe; 29-Primary cooler; 30-Secondary cooler; 31-Heater; 32-Feeding port; 33-Jacket. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Example 1 As attached Figure 1 As shown, this embodiment discloses a tail gas treatment device for copper nitrate production, including a reaction unit and a tail gas treatment unit connected to each other. The reaction unit includes a copper nitrate reactor 2 with a feed port 32, and the copper nitrate reactor 2 is connected to a nitric acid feed pipe 11; The exhaust gas recovery and treatment system includes a primary exhaust gas absorption tower 4 connected to the copper nitrate reactor 2, and a secondary exhaust gas absorption tower 5 connected to the primary exhaust gas absorption tower 4; the primary exhaust gas absorption tower 4 is connected to a pure oxygen storage tank 3, the primary exhaust gas absorption tower 4 is connected to a nitric acid recovery storage tank 6, the secondary exhaust gas absorption tower 5 is connected to a secondary exhaust gas absorption tower demineralized water supply pipe 20, and the secondary exhaust gas absorption tower 5 is connected to an exhaust gas discharge pipe 21.

[0024] This invention provides a highly efficient, automated, and green production process for copper nitrate through the coordinated operation of an integrated reaction unit and a tail gas treatment unit. Employing a two-stage tail gas treatment system, pure oxygen is introduced into the primary absorption tower, efficiently oxidizing and absorbing harmful components in the reaction tail gas, converting them into nitric acid, which is then recycled to a storage tank for resource recovery, significantly reducing raw material costs and material consumption. The tail gas, after deep purification in the secondary absorption tower, meets emission standards, completely solving environmental pollution problems. Overall, this invention achieves highly efficient and stable production, resource utilization of byproducts, and near-zero emissions of waste gas, offering significant advantages in both low cost and environmental friendliness.

[0025] Example 2 As attached Figure 1 As shown, this embodiment discloses a tail gas treatment device for copper nitrate production, including a reaction unit and a tail gas treatment unit connected to each other. The reaction unit includes a copper nitrate reactor 2 with a feed port 32, and the copper nitrate reactor 2 is connected to a nitric acid feed pipe 11; The exhaust gas recovery and treatment system includes a primary exhaust gas absorption tower 4 connected to the copper nitrate reactor 2, and a secondary exhaust gas absorption tower 5 connected to the primary exhaust gas absorption tower 4; the primary exhaust gas absorption tower 4 is connected to a pure oxygen storage tank 3, and the primary exhaust gas absorption tower 4 is connected to a nitric acid recovery storage tank 6; the secondary exhaust gas absorption tower 5 is connected to a secondary exhaust gas absorption tower demineralized water supply pipe 20, and the secondary exhaust gas absorption tower 5 is connected to an exhaust gas discharge pipe 21.

[0026] The reaction unit also includes a nitric acid metering tank 1 connected to the copper nitrate reactor 2. The nitric acid metering tank 1 is connected to the copper nitrate reactor 2 via a nitric acid feed pipe 11, and a valve is provided on the nitric acid feed pipe 11.

[0027] Compared with Example 1, this embodiment provides a more preferred technical solution. Specifically, the reaction unit further includes a nitric acid metering tank 1, which is connected to the copper nitrate reactor 2 via a nitric acid feed pipe 11, and the nitric acid feed pipe 11 is equipped with a valve. This configuration enables precise and controllable addition of nitric acid to the copper nitrate reactor 2, thereby effectively improving the purity of the final product, copper nitrate, and the safety of the reaction process.

[0028] Example 3 As attached Figure 1 As shown, this embodiment discloses a tail gas treatment device for copper nitrate production, including a reaction unit and a tail gas treatment unit connected to each other. The reaction unit includes a copper nitrate reactor 2 with a feed port 32, and the copper nitrate reactor 2 is connected to a nitric acid feed pipe 11; The exhaust gas recovery and treatment system includes a primary exhaust gas absorption tower 4 connected to the copper nitrate reactor 2, and a secondary exhaust gas absorption tower 5 connected to the primary exhaust gas absorption tower 4; the primary exhaust gas absorption tower 4 is connected to a pure oxygen storage tank 3, and the primary exhaust gas absorption tower 4 is connected to a nitric acid recovery storage tank 6; the secondary exhaust gas absorption tower 5 is connected to a secondary exhaust gas absorption tower demineralized water supply pipe 20, and the secondary exhaust gas absorption tower 5 is connected to an exhaust gas discharge pipe 21.

[0029] The reaction unit also includes a nitric acid metering tank 1 connected to the copper nitrate reactor 2. The nitric acid metering tank 1 is connected to the copper nitrate reactor 2 via a nitric acid feed pipe 11, and a valve is provided on the nitric acid feed pipe 11.

[0030] The reaction unit also includes a copper nitrate storage device connected to the copper nitrate reactor 2. The copper nitrate storage device includes a copper nitrate storage tank 23 and a copper nitrate transfer pipe 24 connected to the copper nitrate storage tank 23. A liquid pump 22 is provided on the copper nitrate transfer pipe 24.

[0031] This embodiment 3 provides a more preferred technical solution based on embodiment 2. Specifically, the reaction unit also includes a copper nitrate storage device connected to the copper nitrate reactor 2, and the specific composition of the copper nitrate storage device is defined. This embodiment, by setting up a dedicated copper nitrate storage device and a liquid transfer system, realizes the automatic and closed-loop transportation of reaction products from the reactor to the storage tank, effectively avoiding contamination and loss of materials during the transfer process, and ensuring high purity and yield of the product.

[0032] Example 4 As attached Figure 1 As shown, this embodiment discloses a tail gas treatment device for copper nitrate production, including a reaction unit and a tail gas treatment unit connected to each other. The reaction unit includes a copper nitrate reactor 2 with a feed port 32, and the copper nitrate reactor 2 is connected to a nitric acid feed pipe 11; The exhaust gas recovery and treatment system includes a primary exhaust gas absorption tower 4 connected to the copper nitrate reactor 2, and a secondary exhaust gas absorption tower 5 connected to the primary exhaust gas absorption tower 4; the primary exhaust gas absorption tower 4 is connected to a pure oxygen storage tank 3, and the primary exhaust gas absorption tower 4 is connected to a nitric acid recovery storage tank 6; the secondary exhaust gas absorption tower 5 is connected to a secondary exhaust gas absorption tower demineralized water supply pipe 20, and the secondary exhaust gas absorption tower 5 is connected to an exhaust gas discharge pipe 21.

[0033] The reaction unit also includes a nitric acid metering tank 1 connected to the copper nitrate reactor 2. The nitric acid metering tank 1 is connected to the copper nitrate reactor 2 via a nitric acid feed pipe 11, and a valve is provided on the nitric acid feed pipe 11.

[0034] The reaction unit also includes a copper nitrate storage device connected to the copper nitrate reactor 2. The copper nitrate storage device includes a copper nitrate storage tank 23 and a copper nitrate transfer pipe 24 connected to the copper nitrate storage tank 23. A liquid pump 22 is provided on the copper nitrate transfer pipe 24.

[0035] The copper nitrate reactor 2 is equipped with a heater 31, and a cooling device is provided on the outer wall of the copper nitrate reactor 2. The cooling device includes a jacket 33 on the outer wall of the copper nitrate reactor 2, and a cooling water inlet pipe 27 and a cooling water outlet pipe 28 are connected to the jacket 33. A circulation pipe 12 is connected to the copper nitrate reactor 2, and a circulation pump 7 is installed on the circulation pipe 12.

[0036] This embodiment 4 provides a more preferred technical solution based on embodiment 3. Specifically, a heater 31 is provided inside the copper nitrate reactor 2, and a cooling device is provided on the outer wall of the copper nitrate reactor 2. The cooling device includes a jacket 33 on the outer wall of the copper nitrate reactor 2, with a cooling water inlet pipe 27 connected to the jacket 33 and a cooling water outlet pipe 28 connected to it. A circulation pipe 12 is connected to the copper nitrate reactor 2, and a circulation pump 7 is provided on the circulation pipe 12. This embodiment 4, by integrating heating, cooling, and circulation systems, achieves precise control of the reaction process temperature and uniform mixing of materials, thereby significantly improving reaction efficiency and product purity while reducing energy consumption.

[0037] Example 5 As attached Figure 1 As shown, this embodiment discloses a tail gas treatment device for copper nitrate production, including a reaction unit and a tail gas treatment unit connected to each other. The reaction unit includes a copper nitrate reactor 2 with a feed port 32, and the copper nitrate reactor 2 is connected to a nitric acid feed pipe 11; The exhaust gas recovery and treatment system includes a primary exhaust gas absorption tower 4 connected to the copper nitrate reactor 2, and a secondary exhaust gas absorption tower 5 connected to the primary exhaust gas absorption tower 4; the primary exhaust gas absorption tower 4 is connected to a pure oxygen storage tank 3, and the primary exhaust gas absorption tower 4 is connected to a nitric acid recovery storage tank 6; the secondary exhaust gas absorption tower 5 is connected to a secondary exhaust gas absorption tower demineralized water supply pipe 20, and the secondary exhaust gas absorption tower 5 is connected to an exhaust gas discharge pipe 21.

[0038] The reaction unit also includes a nitric acid metering tank 1 connected to the copper nitrate reactor 2. The nitric acid metering tank 1 is connected to the copper nitrate reactor 2 via a nitric acid feed pipe 11, and a valve is provided on the nitric acid feed pipe 11.

[0039] The reaction unit also includes a copper nitrate storage device connected to the copper nitrate reactor 2. The copper nitrate storage device includes a copper nitrate storage tank 23 and a copper nitrate transfer pipe 24 connected to the copper nitrate storage tank 23. A liquid pump 22 is provided on the copper nitrate transfer pipe 24.

[0040] The copper nitrate reactor 2 is equipped with a heater 31, and a cooling device is provided on the outer wall of the copper nitrate reactor 2. The cooling device includes a jacket 33 on the outer wall of the copper nitrate reactor 2, and a cooling water inlet pipe 27 and a cooling water outlet pipe 28 are connected to the jacket 33. A circulation pipe 12 is connected to the copper nitrate reactor 2, and a circulation pump 7 is installed on the circulation pipe 12.

[0041] A tail gas delivery pipe 13 is connected between the copper nitrate reactor 2 and the primary tail gas absorption tower 4. A tail gas fan 8 is installed on the tail gas delivery pipe 13. A pure oxygen storage tank 3 is connected to the tail gas delivery pipe 13 between the tail gas fan 8 and the primary tail gas absorption tower 4 through a pipeline.

[0042] This embodiment 5 provides a more preferred technical solution based on embodiment 4. Specifically, a tail gas delivery pipe 13 connects the copper nitrate reactor 2 and the primary tail gas absorption tower 4. A tail gas fan 8 is installed on the tail gas delivery pipe 13. A pure oxygen storage tank 3 is connected to the tail gas delivery pipe 13 between the tail gas fan 8 and the primary tail gas absorption tower 4 via a pipeline. This embodiment achieves sufficient pre-mixing of oxygen and tail gas before they enter the absorption tower by directly feeding pure oxygen into the delivery pipe pressurized by the tail gas fan, thereby significantly enhancing oxidation and absorption efficiency and reducing system energy consumption.

[0043] Example 6 As attached Figure 1 As shown, this embodiment discloses a tail gas treatment device for copper nitrate production, including a reaction unit and a tail gas treatment unit connected to each other. The reaction unit includes a copper nitrate reactor 2 with a feed port 32, and the copper nitrate reactor 2 is connected to a nitric acid feed pipe 11; The exhaust gas recovery and treatment system includes a primary exhaust gas absorption tower 4 connected to the copper nitrate reactor 2, and a secondary exhaust gas absorption tower 5 connected to the primary exhaust gas absorption tower 4; the primary exhaust gas absorption tower 4 is connected to a pure oxygen storage tank 3, and the primary exhaust gas absorption tower 4 is connected to a nitric acid recovery storage tank 6; the secondary exhaust gas absorption tower 5 is connected to a secondary exhaust gas absorption tower demineralized water supply pipe 20, and the secondary exhaust gas absorption tower 5 is connected to an exhaust gas discharge pipe 21.

[0044] The reaction unit also includes a nitric acid metering tank 1 connected to the copper nitrate reactor 2. The nitric acid metering tank 1 is connected to the copper nitrate reactor 2 via a nitric acid feed pipe 11, and a valve is provided on the nitric acid feed pipe 11.

[0045] The reaction unit also includes a copper nitrate storage device connected to the copper nitrate reactor 2. The copper nitrate storage device includes a copper nitrate storage tank 23 and a copper nitrate transfer pipe 24 connected to the copper nitrate storage tank 23. A liquid pump 22 is provided on the copper nitrate transfer pipe 24.

[0046] The copper nitrate reactor 2 is equipped with a heater 31, and a cooling device is provided on the outer wall of the copper nitrate reactor 2. The cooling device includes a jacket 33 on the outer wall of the copper nitrate reactor 2, and a cooling water inlet pipe 27 and a cooling water outlet pipe 28 are connected to the jacket 33. A circulation pipe 12 is connected to the copper nitrate reactor 2, and a circulation pump 7 is installed on the circulation pipe 12.

[0047] A tail gas delivery pipe 13 is connected between the copper nitrate reactor 2 and the primary tail gas absorption tower 4. A tail gas fan 8 is installed on the tail gas delivery pipe 13. A pure oxygen storage tank 3 is connected to the tail gas delivery pipe 13 between the tail gas fan 8 and the primary tail gas absorption tower 4 through a pipeline.

[0048] A primary tail gas absorption tower circulation pipe 26 is connected between the outlet of the primary tail gas absorption tower 4 and the tail gas conveying pipe 13, and a secondary tail gas absorption tower circulation pipe 25 is connected between the outlet of the secondary tail gas absorption tower 5 and the primary tail gas absorption tower circulation pipe 26.

[0049] This embodiment 6 provides a more preferred technical solution based on embodiment 5. Specifically: a primary tail gas absorption tower circulation pipe 26 is connected between the outlet of the primary tail gas absorption tower 4 and the tail gas conveying pipe 13, and a secondary tail gas absorption tower circulation pipe 25 is connected between the outlet of the secondary tail gas absorption tower 5 and the primary tail gas absorption tower circulation pipe 26. This embodiment forms a closed-loop treatment process for tail gas by recirculating the tail gas from the outlets of the two absorption towers to the front end, significantly improving the tail gas purification effect and raw material utilization rate, and achieving ultra-low emissions.

[0050] Example 7 As attached Figure 1 As shown, this embodiment discloses a tail gas treatment device for copper nitrate production, including a reaction unit and a tail gas treatment unit connected to each other. The reaction unit includes a copper nitrate reactor 2 with a feed port 32, and the copper nitrate reactor 2 is connected to a nitric acid feed pipe 11; The exhaust gas recovery and treatment system includes a primary exhaust gas absorption tower 4 connected to the copper nitrate reactor 2, and a secondary exhaust gas absorption tower 5 connected to the primary exhaust gas absorption tower 4; the primary exhaust gas absorption tower 4 is connected to a pure oxygen storage tank 3, and the primary exhaust gas absorption tower 4 is connected to a nitric acid recovery storage tank 6; the secondary exhaust gas absorption tower 5 is connected to a secondary exhaust gas absorption tower demineralized water supply pipe 20, and the secondary exhaust gas absorption tower 5 is connected to an exhaust gas discharge pipe 21.

[0051] The reaction unit also includes a nitric acid metering tank 1 connected to the copper nitrate reactor 2. The nitric acid metering tank 1 is connected to the copper nitrate reactor 2 via a nitric acid feed pipe 11, and a valve is provided on the nitric acid feed pipe 11.

[0052] The reaction unit also includes a copper nitrate storage device connected to the copper nitrate reactor 2. The copper nitrate storage device includes a copper nitrate storage tank 23 and a copper nitrate transfer pipe 24 connected to the copper nitrate storage tank 23. A liquid pump 22 is provided on the copper nitrate transfer pipe 24.

[0053] The copper nitrate reactor 2 is equipped with a heater 31, and a cooling device is provided on the outer wall of the copper nitrate reactor 2. The cooling device includes a jacket 33 on the outer wall of the copper nitrate reactor 2, and a cooling water inlet pipe 27 and a cooling water outlet pipe 28 are connected to the jacket 33. A circulation pipe 12 is connected to the copper nitrate reactor 2, and a circulation pump 7 is installed on the circulation pipe 12.

[0054] A tail gas delivery pipe 13 is connected between the copper nitrate reactor 2 and the primary tail gas absorption tower 4. A tail gas fan 8 is installed on the tail gas delivery pipe 13. A pure oxygen storage tank 3 is connected to the tail gas delivery pipe 13 between the tail gas fan 8 and the primary tail gas absorption tower 4 through a pipeline.

[0055] A primary tail gas absorption tower circulation pipe 26 is connected between the outlet of the primary tail gas absorption tower 4 and the tail gas conveying pipe 13, and a secondary tail gas absorption tower circulation pipe 25 is connected between the outlet of the secondary tail gas absorption tower 5 and the primary tail gas absorption tower circulation pipe 26.

[0056] A primary tail gas absorption tower 4 is connected to a primary tail gas absorption tower circulating liquid pipe 16, and a primary circulating liquid pump 9 is installed on the primary tail gas absorption tower circulating liquid pipe 16. The nitric acid recovery storage tank 6 is connected to the outlet pipe of the primary circulating liquid pump 9.

[0057] This embodiment 7 provides a more preferred technical solution based on embodiment 6. Specifically: a primary tail gas absorption tower 4 is connected to a primary tail gas absorption tower circulating liquid pipe 16, and a primary circulating liquid pump 9 is installed on the primary tail gas absorption tower circulating liquid pipe 16. The nitric acid recovery storage tank 6 is connected to the outlet pipe of the primary circulating liquid pump 9. This embodiment, by establishing an absorbent liquid circulation system for the primary tail gas absorption tower 4 and connecting it to the nitric acid recovery storage tank, achieves continuous and efficient utilization of the absorbent liquid and timely removal of the product, thereby significantly improving the tail gas treatment efficiency and nitric acid recovery rate.

[0058] Example 8 As attached Figure 1 As shown, this embodiment discloses a tail gas treatment device for copper nitrate production, including a reaction unit and a tail gas treatment unit connected to each other. The reaction unit includes a copper nitrate reactor 2 with a feed port 32, and the copper nitrate reactor 2 is connected to a nitric acid feed pipe 11; The exhaust gas recovery and treatment system includes a primary exhaust gas absorption tower 4 connected to the copper nitrate reactor 2, and a secondary exhaust gas absorption tower 5 connected to the primary exhaust gas absorption tower 4; the primary exhaust gas absorption tower 4 is connected to a pure oxygen storage tank 3, and the primary exhaust gas absorption tower 4 is connected to a nitric acid recovery storage tank 6; the secondary exhaust gas absorption tower 5 is connected to a secondary exhaust gas absorption tower demineralized water supply pipe 20, and the secondary exhaust gas absorption tower 5 is connected to an exhaust gas discharge pipe 21.

[0059] The reaction unit also includes a nitric acid metering tank 1 connected to the copper nitrate reactor 2. The nitric acid metering tank 1 is connected to the copper nitrate reactor 2 via a nitric acid feed pipe 11, and a valve is provided on the nitric acid feed pipe 11.

[0060] The reaction unit also includes a copper nitrate storage device connected to the copper nitrate reactor 2. The copper nitrate storage device includes a copper nitrate storage tank 23 and a copper nitrate transfer pipe 24 connected to the copper nitrate storage tank 23. A liquid pump 22 is provided on the copper nitrate transfer pipe 24.

[0061] The copper nitrate reactor 2 is equipped with a heater 31, and a cooling device is provided on the outer wall of the copper nitrate reactor 2. The cooling device includes a jacket 33 on the outer wall of the copper nitrate reactor 2, and a cooling water inlet pipe 27 and a cooling water outlet pipe 28 are connected to the jacket 33. A circulation pipe 12 is connected to the copper nitrate reactor 2, and a circulation pump 7 is installed on the circulation pipe 12.

[0062] A tail gas delivery pipe 13 is connected between the copper nitrate reactor 2 and the primary tail gas absorption tower 4. A tail gas fan 8 is installed on the tail gas delivery pipe 13. A pure oxygen storage tank 3 is connected to the tail gas delivery pipe 13 between the tail gas fan 8 and the primary tail gas absorption tower 4 through a pipeline.

[0063] A primary tail gas absorption tower circulation pipe 26 is connected between the outlet of the primary tail gas absorption tower 4 and the tail gas conveying pipe 13, and a secondary tail gas absorption tower circulation pipe 25 is connected between the outlet of the secondary tail gas absorption tower 5 and the primary tail gas absorption tower circulation pipe 26.

[0064] A primary tail gas absorption tower 4 is connected to a primary tail gas absorption tower circulating liquid pipe 16, and a primary circulating liquid pump 9 is installed on the primary tail gas absorption tower circulating liquid pipe 16. The nitric acid recovery storage tank 6 is connected to the outlet pipe of the primary circulating liquid pump 9.

[0065] A secondary tail gas absorption tower 5 is connected to a secondary tail gas absorption tower circulating liquid pipe 19, and a secondary circulating liquid pump 10 is installed on the secondary tail gas absorption tower circulating liquid pipe 19. A primary tail gas absorption tower makeup liquid pipe 18 is connected between the outlet of the primary circulating liquid pump 9 and the outlet of the secondary circulating liquid pump 10.

[0066] This embodiment 8 provides a more preferred technical solution based on embodiment 7. Specifically, a secondary tail gas absorption tower 5 is connected to a secondary tail gas absorption tower circulating liquid pipe 19, and a secondary circulating liquid pump 10 is installed on the secondary tail gas absorption tower circulating liquid pipe 19. A primary tail gas absorption tower makeup liquid pipe 18 is connected between the outlet of the primary circulating liquid pump 9 and the outlet of the secondary circulating liquid pump 10. This embodiment 8 achieves dynamic balance and efficient utilization of the concentration and pH of the two-stage absorbent by establishing a makeup liquid linkage between the primary and secondary absorption towers and configuring independent circulation and makeup water systems for each, thereby significantly improving the tail gas purification efficiency while minimizing material consumption and waste liquid discharge.

[0067] Example 9 As attached Figure 1 As shown, this embodiment discloses a tail gas treatment device for copper nitrate production, including a reaction unit and a tail gas treatment unit connected to each other. The reaction unit includes a copper nitrate reactor 2 with a feed port 32, and the copper nitrate reactor 2 is connected to a nitric acid feed pipe 11; The exhaust gas recovery and treatment system includes a primary exhaust gas absorption tower 4 connected to the copper nitrate reactor 2, and a secondary exhaust gas absorption tower 5 connected to the primary exhaust gas absorption tower 4; the primary exhaust gas absorption tower 4 is connected to a pure oxygen storage tank 3, and the primary exhaust gas absorption tower 4 is connected to a nitric acid recovery storage tank 6; the secondary exhaust gas absorption tower 5 is connected to a secondary exhaust gas absorption tower demineralized water supply pipe 20, and the secondary exhaust gas absorption tower 5 is connected to an exhaust gas discharge pipe 21.

[0068] The reaction unit also includes a nitric acid metering tank 1 connected to the copper nitrate reactor 2. The nitric acid metering tank 1 is connected to the copper nitrate reactor 2 via a nitric acid feed pipe 11, and a valve is provided on the nitric acid feed pipe 11.

[0069] The reaction unit also includes a copper nitrate storage device connected to the copper nitrate reactor 2. The copper nitrate storage device includes a copper nitrate storage tank 23 and a copper nitrate transfer pipe 24 connected to the copper nitrate storage tank 23. A liquid pump 22 is provided on the copper nitrate transfer pipe 24.

[0070] The copper nitrate reactor 2 is equipped with a heater 31, and a cooling device is provided on the outer wall of the copper nitrate reactor 2. The cooling device includes a jacket 33 on the outer wall of the copper nitrate reactor 2, and a cooling water inlet pipe 27 and a cooling water outlet pipe 28 are connected to the jacket 33. A circulation pipe 12 is connected to the copper nitrate reactor 2, and a circulation pump 7 is installed on the circulation pipe 12.

[0071] A tail gas delivery pipe 13 is connected between the copper nitrate reactor 2 and the primary tail gas absorption tower 4. A tail gas fan 8 is installed on the tail gas delivery pipe 13. A pure oxygen storage tank 3 is connected to the tail gas delivery pipe 13 between the tail gas fan 8 and the primary tail gas absorption tower 4 through a pipeline.

[0072] A primary tail gas absorption tower circulation pipe 26 is connected between the outlet of the primary tail gas absorption tower 4 and the tail gas conveying pipe 13, and a secondary tail gas absorption tower circulation pipe 25 is connected between the outlet of the secondary tail gas absorption tower 5 and the primary tail gas absorption tower circulation pipe 26.

[0073] A primary tail gas absorption tower 4 is connected to a primary tail gas absorption tower circulating liquid pipe 16, and a primary circulating liquid pump 9 is installed on the primary tail gas absorption tower circulating liquid pipe 16. The nitric acid recovery storage tank 6 is connected to the outlet pipe of the primary circulating liquid pump 9.

[0074] A secondary tail gas absorption tower 5 is connected to a secondary tail gas absorption tower circulating liquid pipe 19, and a secondary circulating liquid pump 10 is installed on the secondary tail gas absorption tower circulating liquid pipe 19. A primary tail gas absorption tower makeup liquid pipe 18 is connected between the outlet of the primary circulating liquid pump 9 and the outlet of the secondary circulating liquid pump 10.

[0075] A primary cooler 29 is installed on the circulating liquid pipe 16 of the primary tail gas absorption tower, and a secondary cooler 30 is installed on the circulating liquid pipe 19 of the secondary tail gas absorption tower.

[0076] This embodiment 9 provides a more preferred technical solution based on embodiment 8. Specifically, a primary cooler 29 is provided on the circulating liquid pipe 16 of the primary tail gas absorption tower, and a secondary cooler 30 is provided on the circulating liquid pipe 19 of the secondary tail gas absorption tower. By configuring coolers on the circulating liquid pipes of the two absorption towers respectively, this embodiment 9 can effectively maintain a lower temperature of the absorbent liquid, thereby significantly improving its absorption efficiency for harmful components in the tail gas and ensuring continuous and stable operation of the system.

[0077] Example 10 As attached Figure 1 As shown, this embodiment discloses a tail gas treatment device for copper nitrate production, including a reaction unit and a tail gas treatment unit connected to each other. The reaction unit includes a copper nitrate reactor 2 with a feed port 32, and the copper nitrate reactor 2 is connected to a nitric acid feed pipe 11; The exhaust gas recovery and treatment system includes a primary exhaust gas absorption tower 4 connected to the copper nitrate reactor 2, and a secondary exhaust gas absorption tower 5 connected to the primary exhaust gas absorption tower 4; the primary exhaust gas absorption tower 4 is connected to a pure oxygen storage tank 3, and the primary exhaust gas absorption tower 4 is connected to a nitric acid recovery storage tank 6; the secondary exhaust gas absorption tower 5 is connected to a secondary exhaust gas absorption tower demineralized water supply pipe 20, and the secondary exhaust gas absorption tower 5 is connected to an exhaust gas discharge pipe 21.

[0078] The reaction unit also includes a nitric acid metering tank 1 connected to the copper nitrate reactor 2. The nitric acid metering tank 1 is connected to the copper nitrate reactor 2 via a nitric acid feed pipe 11, and a valve is provided on the nitric acid feed pipe 11.

[0079] The reaction unit also includes a copper nitrate storage device connected to the copper nitrate reactor 2. The copper nitrate storage device includes a copper nitrate storage tank 23 and a copper nitrate transfer pipe 24 connected to the copper nitrate storage tank 23. A liquid pump 22 is provided on the copper nitrate transfer pipe 24.

[0080] The copper nitrate reactor 2 is equipped with a heater 31, and a cooling device is provided on the outer wall of the copper nitrate reactor 2. The cooling device includes a jacket 33 on the outer wall of the copper nitrate reactor 2, and a cooling water inlet pipe 27 and a cooling water outlet pipe 28 are connected to the jacket 33. A circulation pipe 12 is connected to the copper nitrate reactor 2, and a circulation pump 7 is installed on the circulation pipe 12.

[0081] A tail gas delivery pipe 13 is connected between the copper nitrate reactor 2 and the primary tail gas absorption tower 4. A tail gas fan 8 is installed on the tail gas delivery pipe 13. A pure oxygen storage tank 3 is connected to the tail gas delivery pipe 13 between the tail gas fan 8 and the primary tail gas absorption tower 4 through a pipeline.

[0082] A primary tail gas absorption tower circulation pipe 26 is connected between the outlet of the primary tail gas absorption tower 4 and the tail gas conveying pipe 13, and a secondary tail gas absorption tower circulation pipe 25 is connected between the outlet of the secondary tail gas absorption tower 5 and the primary tail gas absorption tower circulation pipe 26.

[0083] A primary tail gas absorption tower 4 is connected to a primary tail gas absorption tower circulating liquid pipe 16, and a primary circulating liquid pump 9 is installed on the primary tail gas absorption tower circulating liquid pipe 16. The nitric acid recovery storage tank 6 is connected to the outlet pipe of the primary circulating liquid pump 9.

[0084] A secondary tail gas absorption tower 5 is connected to a secondary tail gas absorption tower circulating liquid pipe 19, and a secondary circulating liquid pump 10 is installed on the secondary tail gas absorption tower circulating liquid pipe 19. A primary tail gas absorption tower makeup liquid pipe 18 is connected between the outlet of the primary circulating liquid pump 9 and the outlet of the secondary circulating liquid pump 10.

[0085] A primary cooler 29 is installed on the circulating liquid pipe 16 of the primary tail gas absorption tower, and a secondary cooler 30 is installed on the circulating liquid pipe 19 of the secondary tail gas absorption tower.

[0086] An oxygen delivery pipe 14 is connected between the pure oxygen storage tank 3 and the tail gas delivery pipe 13, and a valve is provided on the oxygen delivery pipe 14. A nitric acid recovery pipe 17 is connected between the nitric acid recovery storage tank 6 and the outlet of the primary circulating liquid pump 9, and a valve is installed on the nitric acid recovery pipe 17. The outlet of the primary tail gas absorption tower 4 and the inlet of the secondary tail gas absorption tower 5 are connected by a tail gas delivery pipe 15 for the primary tail gas absorption tower.

[0087] This embodiment 10 provides a more preferred technical solution based on embodiment 9. Specifically: an oxygen delivery pipe 14 is connected between the pure oxygen storage tank 3 and the tail gas delivery pipe 13, and a valve is installed on the oxygen delivery pipe 14; a nitric acid recovery pipe 17 is connected between the nitric acid recovery storage tank 6 and the outlet of the primary circulating liquid pump 9, and a valve is installed on the nitric acid recovery pipe 17; a primary tail gas absorption tower tail gas delivery pipe 15 is connected between the outlet of the primary tail gas absorption tower 4 and the inlet of the secondary tail gas absorption tower 5. This embodiment 10, by adding a dedicated delivery pipeline with a valve, achieves precise control of oxygen supply, nitric acid recovery, and tail gas delivery path, thereby further optimizing the flexibility, stability, and overall efficiency of system operation.

[0088] Example 11 This embodiment discloses a method for producing copper nitrate using the high-purity copper nitrate production apparatus of Example 10, with specific operating steps as follows: 1. First, perform system initialization: Excess electrolytic copper is added to the copper nitrate reactor 2 through the feed port 32 at the top, and sufficient nitric acid is added to the nitric acid metering tank 1. Demineralized water is added to the secondary tail gas absorption tower 5 through the demineralized water replenishment pipe 20 until the bottom liquid level of the tower reaches 80%, and at the same time, liquid is added to the primary tail gas absorption tower 4 through the primary tail gas absorption tower replenishment pipe 18 until the bottom liquid level of the tower reaches 80%.

[0089] 2. Next, establish a loop system: Start the primary circulating liquid pump 9 to establish liquid phase circulation in the primary tail gas absorption tower, and set the circulation flow rate to 55m³ / h. 3 / h; Start the secondary circulating liquid pump 10 to establish liquid phase circulation in the secondary tail gas absorption tower, and set the circulation flow rate to 50m³ / h. 3 / h. The circulating gas volume is set to 250m³ / h through the circulating gas pipe 26 of the primary tail gas absorption tower. 3 / h.

[0090] 3. Then, configure the system parameters: Pure oxygen is introduced into the system through oxygen delivery pipe 14, with the oxygen flow rate set to 40 m³ / h. 3 / h; The pressure of the first-stage tail gas absorption tower is set to 60 kPa, and the pressure of the second-stage tail gas absorption tower is set to 58 kPa. The temperature of the two-stage absorption towers is controlled at 10℃ through the first-stage cooler 29 and the second-stage cooler 30.

[0091] 4. Finally, initiate the main reaction: The temperature of the copper nitrate reactor was set at 70℃, the pressure at 0 kPa, and the nitric acid feed flow rate at 1.0 m³ / h. 3 The makeup water flow rate for the demineralized water in the secondary tail gas absorption tower is 0.4 m³ / h. 3 / h.

[0092] Testing revealed that the nitrogen oxide content in the exhaust gas, as monitored through exhaust pipe 21 at the top of the secondary exhaust gas absorption tower, was 40 mg / m³. 3 Meanwhile, the concentration of nitric acid recovered in nitric acid recovery storage tank 6 reaches 15%.

[0093] This embodiment demonstrates that the oxygen supply is a key parameter of this process. When the oxygen supply decreases, the nitrogen oxide content in the exhaust gas increases, and the absorption efficiency decreases significantly.

[0094] Finally, it should be noted that the above embodiments are merely preferred embodiments used to illustrate the technical solution of this utility model, and are not intended to limit it, much less limit the patent scope of this utility model. Any modifications or refinements made to the main design concept and spirit of this utility model that are not of substantial significance, but which still solve the same technical problem as this utility model, should be included within the protection scope of this utility model; in addition, the direct or indirect application of the technical solution of this utility model to other related technical fields are similarly included within the patent protection scope of this utility model.

Claims

1. A tail gas treatment device for copper nitrate production, characterized in that, This includes interconnected reaction units and exhaust gas treatment units; The reaction unit includes a copper nitrate reactor (2) with a feeding port (32) and a nitric acid feed pipe (11) connected to the copper nitrate reactor (2). The exhaust gas recovery and treatment system includes a primary exhaust gas absorption tower (4) connected to the copper nitrate reactor (2) and a secondary exhaust gas absorption tower (5) connected to the primary exhaust gas absorption tower (4); the primary exhaust gas absorption tower (4) is connected to a pure oxygen storage tank (3), and the primary exhaust gas absorption tower (4) is connected to a nitric acid recovery storage tank (6); the secondary exhaust gas absorption tower (5) is connected to a secondary exhaust gas absorption tower demineralized water supply pipe (20), and the secondary exhaust gas absorption tower (5) is connected to an exhaust gas discharge pipe (21).

2. The tail gas treatment device for copper nitrate production according to claim 1, characterized in that, The reaction unit also includes a nitric acid metering tank (1) connected to the copper nitrate reactor (2). The nitric acid metering tank (1) is connected to the copper nitrate reactor (2) via a nitric acid feed pipe (11), and a valve is provided on the nitric acid feed pipe (11).

3. The tail gas treatment device for copper nitrate production according to claim 1, characterized in that, The reaction unit also includes a copper nitrate storage device connected from the copper nitrate reactor (2). The copper nitrate storage device includes a copper nitrate tank (23) and a copper nitrate transfer pipe (24) connected from the copper nitrate reactor (2) and into the copper nitrate tank (23). A liquid pump (22) is provided on the copper nitrate transfer pipe (24).

4. A tail gas treatment device for copper nitrate production according to any one of claims 1-3, characterized in that, A heater (31) is provided inside the copper nitrate reactor (2), and a cooling device is provided on the outer wall of the copper nitrate reactor (2); the cooling device includes a jacket (33) provided on the outer wall of the copper nitrate reactor (2), and a cooling water inlet pipe (27) is connected to the jacket (33) and a cooling water outlet pipe (28) is connected out. A circulation pipe (12) is connected to the copper nitrate reactor (2), and a circulation pump (7) is installed on the circulation pipe (12).

5. The tail gas treatment device for copper nitrate production according to claim 1, characterized in that, A tail gas delivery pipe (13) is connected between the copper nitrate reactor (2) and the primary tail gas absorption tower (4). A tail gas fan (8) is installed on the tail gas delivery pipe (13). A pure oxygen storage tank (3) is connected to the tail gas delivery pipe (13) between the tail gas fan (8) and the primary tail gas absorption tower (4) through a pipeline.

6. The tail gas treatment device for copper nitrate production according to claim 5, characterized in that, A primary tail gas absorption tower (4) outlet is connected to a tail gas delivery pipe (13) via a primary tail gas absorption tower circulation pipe (26), and a secondary tail gas absorption tower (5) outlet is connected to a primary tail gas absorption tower circulation pipe (26) via a secondary tail gas absorption tower circulation pipe (25).

7. The tail gas treatment device for copper nitrate production according to claim 6, characterized in that, The primary tail gas absorption tower (4) is connected to the primary tail gas absorption tower circulating liquid pipe (16), and the primary tail gas absorption tower circulating liquid pipe (16) is equipped with a primary circulating liquid pump (9). The nitric acid recovery storage tank (6) is connected to the outlet pipe of the primary circulating liquid pump (9).

8. The tail gas treatment device for copper nitrate production according to claim 7, characterized in that, A secondary tail gas absorption tower (5) is connected to a secondary tail gas absorption tower circulating liquid pipe (19), and a secondary circulating liquid pump (10) is installed on the secondary tail gas absorption tower circulating liquid pipe (19). A primary tail gas absorption tower replenishment pipe (18) is connected between the outlet of the primary circulating liquid pump (9) and the outlet of the secondary circulating liquid pump (10).

9. A tail gas treatment device for copper nitrate production according to claim 8, characterized in that, A primary cooler (29) is installed on the circulating liquid pipe (16) of the primary tail gas absorption tower, and a secondary cooler (30) is installed on the circulating liquid pipe (19) of the secondary tail gas absorption tower.

10. A tail gas treatment device for copper nitrate production according to claim 7, characterized in that, An oxygen delivery pipe (14) is connected between the pure oxygen storage tank (3) and the tail gas delivery pipe (13), and a valve is provided on the oxygen delivery pipe (14); A nitric acid recovery pipe (17) is connected between the outlet of the nitric acid recovery storage tank (6) and the primary circulating liquid pump (9), and a valve is provided on the nitric acid recovery pipe (17); The outlet of the primary tail gas absorption tower (4) and the inlet of the secondary tail gas absorption tower (5) are connected by a tail gas delivery pipe (15) of the primary tail gas absorption tower.

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