Nickel pressure leaching kettle system capable of fully utilizing tail gas
By designing a nickel pressurized leaching kettle system, the exhaust gas of one section of the pressurized kettle is introduced into the second section of the pressurized kettle, and the exhaust flow is controlled by using a pneumatic butterfly valve, which solves the problems of energy waste and steam consumption caused by direct exhaust emissions, and achieves efficient energy utilization and stability of reaction.
Patent Information
- Application Number
- CN202422394576.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-09-30
AI Technical Summary
Direct exhaust emissions in the existing nickel-stage pressurized leaching process lead to energy waste and additional steam consumption, making it difficult to maintain process conditions.
A nickel pressurized leaching kettle system is designed, and the exhaust gas of a first-stage pressurized kettle is introduced into the second-stage pressurized kettle through conventional and emergency exhaust valve groups. The exhaust gas flow is controlled by using a pneumatic butterfly valve to maintain the reaction conditions of the second-stage pressurized kettle, and the heat of the exhaust gas is recovered and steam consumption is reduced.
The exhaust gas heat is fully utilized, energy consumption is reduced, the stability and safety of the reaction is ensured, and energy waste is avoided.
Smart Images
Figure CN223292602U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pressurized hydrometallurgy, in particular to a nickel pressurized leaching kettle system which fully utilizes tail gas. Background Art
[0002] The pressurized hydrometallurgy industry currently widely uses a two-stage pressure leaching process for nickel leaching to remove iron. The process conditions required for the first stage of pressure leaching are relatively high in temperature and pressure, and because the reaction is more active, the heat of reaction is also high. In contrast, the second stage of pressure leaching requires lower temperature and pressure, but because the reaction process is more gradual, the heat of reaction released is less, making it difficult to maintain the required control conditions. Therefore, to achieve and maintain the required process conditions for the second stage of pressure leaching, steam is often introduced into the second stage pressure reactor to increase the reaction temperature. Under existing technology, the tail gas from the pressure reactor is directly discharged into the atmosphere after tail gas treatment.
[0003] Therefore, the direct emission of pressure leaching tail gas in the existing two-stage pressure leaching of nickel causes energy waste, and the two-stage pressure leaching requires the consumption of additional steam, which also causes energy consumption. Utility Model Content
[0004] In order to maintain the process conditions required for the second-stage pressure leaching and reduce energy consumption and waste, the utility model provides a nickel pressure leaching kettle system that fully utilizes tail gas. The specific scheme is as follows:
[0005] A nickel pressure leaching kettle system that fully utilizes tail gas comprises: a first-stage pressure kettle, a main pipe, a branch pipe, and a second-stage pressure kettle. The first-stage pressure kettle is equipped with a conventional exhaust valve group and an emergency exhaust valve group. One end of the main pipe is connected to the conventional exhaust valve group, and the other end of the main pipe is connected to the branch pipe. The main pipe is equipped with a check valve. The second-stage pressure kettle is provided with four compartments from top to bottom, namely a first compartment, a second compartment, a third compartment, and a fourth compartment. Gases are communicated between the compartments. There are four branch pipes, which are respectively connected to the four compartments. The three branch pipes connected to the second compartment, the third compartment, and the fourth compartment are equipped with pneumatic butterfly valves and pressure monitoring instruments.
[0006] Furthermore, the conventional exhaust valve group includes a manual valve and a pneumatic switch valve, and the emergency exhaust valve group includes a safety valve.
[0007] Furthermore, it also includes a temperature sensor controller, and the pneumatic butterfly valve is connected to the temperature sensor controller.
[0008] Furthermore, the four compartments of the second-stage autoclave are respectively welded with tube sheets, and the branch pipes extend into the four compartments through the tube sheet openings.
[0009] The beneficial effects of the utility model are as follows: the utility model uses a set of conventional exhaust valves and a set of emergency exhaust valves to pass the tail gas from the first-stage pressurized leaching kettle to the second-stage pressurized leaching kettle under normal production conditions. When the pressure of the first-stage pressurized leaching kettle exceeds the limit, the emergency exhaust valve is used to exhaust and release the pressure to the atmosphere, ensuring that the reaction is safe and controllable. The high-temperature tail gas generated by the first-stage pressurized leaching kettle passes from the pressure kettle through the manual valve, pneumatic switch valve, check valve, and pneumatic butterfly valve in sequence into the second-stage pressurized leaching kettle, fully recycling the small amount of reaction raw materials and all heat in the exhaust gas from the first-stage pressurized leaching kettle, reducing the additional steam consumption for heating the second-stage pressurized leaching kettle, and achieving the purpose of saving energy and reducing emissions. In addition, high-temperature tail gas is continuously introduced into the first compartment through the main pipe and branch pipes, and pneumatic butterfly valves are provided on the branch pipes of the second, third and fourth compartments. The pneumatic butterfly valves are connected to the temperature controller. The opening and closing and the degree of opening and closing of the pneumatic butterfly valves are controlled according to the temperature conditions of each compartment in the second-stage pressurized leaching kettle, so that the high-temperature tail gas generated by the first-stage pressurized leaching kettle is fully utilized and the reaction conditions in the second-stage pressurized leaching kettle are maintained stable, which is conducive to the stable progress of the reaction. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The following further describes the embodiments of the present invention with reference to the accompanying drawings, wherein:
[0011] Figure 1 A schematic diagram of a nickel pressure leaching kettle system that fully utilizes tail gas is shown in the utility model;
[0012] Figure 2 A flow chart showing a method for controlling a pneumatic butterfly valve by a temperature controller is shown.
[0013] Among them, 1-first stage autoclave, 2-conventional exhaust valve group, 21-manual valve, 22-pneumatic switch valve, 3-emergency exhaust valve group, 31-safety valve, 4-main pipe, 41-check valve, 5-second stage autoclave, 6-branch pipe, 61-pneumatic butterfly valve. DETAILED DESCRIPTION
[0014] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0015] like Figure 1-2As shown, a conventional exhaust valve group 2 and an emergency exhaust valve group 3 are installed on the first-stage pressure reactor 1. The conventional exhaust valve group 2 includes a manual valve 21, a pneumatic switch valve 22 and a pipeline. The emergency exhaust valve group includes a safety valve 31 and a pipeline. The trip pressure of the safety valve 31 is 0.2 MPa higher than the normal production pressure of the first-stage pressure leaching reactor. When the pressure of the first-stage pressure reactor 1 reaches the trip pressure, the safety valve automatically trips to ensure that the reaction is safe and controllable. After the tail gas of the first stage pressure kettle 1 overflows from the kettle, it passes through the conventional exhaust valve group 2 and enters the main pipe 4 connecting the first stage pressure kettle and the branch pipe 6. A check valve 41 is installed on the main pipe 4. After the tail gas flows through the main pipe 4, it reaches the four branch pipes 6 connected to the main pipe 4 and the second stage pressure kettle 5. The four branch pipes 6 are respectively inserted into the four compartments in the kettle through the tube plate openings of each compartment of the second stage pressure kettle. The branch pipes connecting the second, third and fourth compartments of the second stage pressure kettle 5 are all equipped with pneumatic butterfly valves 61. The branch pipe connecting the first compartment is not equipped with a valve. The gases between the four compartments are interconnected. The high-temperature tail gas of the first stage pressurization can be continuously passed into the first compartment to heat the second stage pressure kettle 5. The pneumatic butterfly valves 61 on the branch pipes connecting the second, third and fourth compartments are connected to the temperature sensor controller of the corresponding compartment (i.e., the attached Figure 2 The system is interlocked with a temperature transmitter in the first stage of pressurized leaching. If the temperature is lower than the set temperature, pneumatic butterfly valve 61 opens and adjusts the amount of high-temperature tail gas entering the first stage of pressurized leaching. If the temperature is higher than the set temperature, pneumatic butterfly valve 61 is closed or its opening is reduced. The openings of the pneumatic butterfly valves 61 in the three branch pipes and the temperatures in each compartment of the second stage of pressurized leaching kettle are displayed on the computer in the central control room. The piping in this system is made of 316L stainless steel, the pneumatic butterfly valve model is D641F, and the pneumatic on-off valve model is HK60-Q-3PS-K. This system fully utilizes the high-temperature tail gas from the first stage of pressurized leaching, saving energy and protecting the environment. The amount of tail gas entering the second stage of pressurized leaching kettle is controlled according to the temperature in the kettle, ensuring relatively stable reaction conditions and promoting efficient leaching.
[0016] Some exemplary embodiments of the present invention are described above. It will be understood that the above embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention. The features in these embodiments can be recombined in an appropriate manner, and the solutions obtained thereby are still within the scope of protection claimed by the present invention. Based on the above embodiments, all other embodiments obtained by those skilled in the art without making any creative work, that is, all modifications, equivalent substitutions and improvements made within the spirit and principles of this application, fall within the scope of protection claimed by the present invention.
Claims
1. A nickel pressure leaching kettle system that fully utilizes tail gas, characterized in that: include: A first-stage pressure kettle (1), a main pipe (4), a branch pipe (6) and a second-stage pressure kettle (5), wherein the first-stage pressure kettle (1) is equipped with a conventional exhaust valve group (2) and an emergency exhaust valve group (3), one end of the main pipe (4) is connected to the conventional exhaust valve group (2), and the other end of the main pipe (4) is connected to the branch pipe (6), and the main pipe (4) is equipped with a check valve (41). The second-stage pressure kettle (5) is provided with four compartments from top to bottom, namely, a first compartment, a second compartment, a third compartment and a fourth compartment, and the gases between the compartments are interconnected. There are four branch pipes (6) in total, which are respectively connected to the four compartments. The three branch pipes connected to the second compartment, the third compartment and the fourth compartment are equipped with pneumatic butterfly valves (61) and pressure monitoring instruments.
2. The nickel pressure leaching kettle system for fully utilizing tail gas according to claim 1, characterized in that: The conventional exhaust valve assembly (2) comprises a manual valve (21) and a pneumatic switch valve (22), and the emergency exhaust valve assembly (3) comprises a safety valve (31).
3. The nickel pressure leaching kettle system for fully utilizing tail gas according to claim 1, characterized in that: It also includes a temperature sensor controller, and the pneumatic butterfly valve (61) is connected to the temperature sensor controller.
4. The nickel pressure leaching kettle system for fully utilizing tail gas according to claim 1, characterized in that: The four compartments of the two-stage autoclave (5) are respectively welded with tube sheets, and the branch pipes (6) extend into the four compartments through the tube sheet openings.