Comprehensive utilization device for heat energy of nickel matte pressurized oxygen leaching flash evaporation tail gas
By designing the flash slurry balance tower and gas collection purification tank in the nickel sulfonate pressurized oxygen leaching process, the flash exhaust gas is filtered and purified, and the problems of energy waste and environmental pressure caused by the unused exhaust gas are solved, and efficient exhaust gas is achieved Heat energy utilization and slurry particle recovery.
Patent Information
- Application Number
- CN202411260708.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-02-25
AI Technical Summary
In the existing nickel sulfonate pressurized oxygen leaching process, flash exhaust gas is not effectively utilized, resulting in waste of energy and environmental pressure. At the same time, the flash tank pressure increases and the flash evaporation effect is poor, and there is a problem of loss of valuable metals and incomplete gas-liquid separation.
A comprehensive thermal energy utilization device for nickel sulfonate pressurized oxygen leach flash exhaust gas is designed, including a flash slurry balance tower and a gas collection purification tank. The flash exhaust gas is filtered and purified through a steady flow filter and a gas distribution device, and the exhaust gas is recovered and utilized, and the water vapor separation is performed in the flash slurry balance tower to thoroughly treat the gas in the ore slurry.
Effectively prevent flash exhaust from polluting the environment, avoiding the loss of valuable metals, improving the thermal energy utilization rate of exhaust gas and slurry particle recovery rate, reducing the pressure of flash tanks, and improving the flash evaporation effect.
Smart Images
Figure CN119506568A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of flash evaporation equipment, and relates to a device and method for comprehensive utilization of thermal energy of nickel matte pressurized oxygen immersion flash evaporation tail gas. Background Art
[0002] The nickel matte pressurized oxygen leaching process usually adopts the process of atmospheric pressure leaching + pressurized leaching. Atmospheric pressure leaching requires steam heating to accelerate the reaction rate, while the oxygen pressure leaching in the pressure kettle is an exothermic reaction. The high-temperature and high-pressure leaching slurry produces a large amount of flash tail gas after flash evaporation in the flash tank. The flash tail gas carries chemical reaction heat and a small amount of saturated water vapor, sulfuric acid mist, residual oxygen, etc., which are directly discharged and cannot be effectively utilized, resulting in energy waste and environmental pressure. At the same time, the flash tail gas also carries a small amount of slurry particles, and there is a problem of valuable metal loss if it is directly discharged. If the flash tail gas is not treated and directly reused, there will be new problems such as increased pressure in the flash tank, poor flash effect, incomplete gas-liquid separation, and serious cavitation in the flash tank discharge pipe. Summary of the invention
[0003] The purpose of the present invention is to provide a device for comprehensive utilization of thermal energy of nickel matte pressurized oxygen immersion flash tail gas in view of the problems existing in the prior art.
[0004] To this end, the present invention adopts the following technical solutions: A device for comprehensive utilization of thermal energy of nickel matte pressurized oxygen immersion flash evaporation tail gas, comprising: A flash slurry balance tower, wherein the lower part of the flash slurry balance tower is connected with a flash evaporator discharge pipe; A flash tank, wherein the flash tank is connected to a discharge pipe of the flash evaporator, and a flash tail gas pipeline is connected to the top of the flash tank; An air collecting purification tank, wherein the air collecting purification tank is arranged on one side of the flash tank, the flash exhaust gas pipeline penetrates into the air collecting purification tank from the side wall of the air collecting purification tank, a steady flow filter with a planar mesh plate structure and an air distributor with an inverted umbrella mesh plate structure are provided in the air collecting purification tank, the steady flow filter is located at the upper part of the air collecting purification tank, the air distributor is located in the middle part of the air collecting purification tank, one end of the flash exhaust gas pipeline is located in the air collecting purification tank to form an air outlet end, the air outlet end faces vertically upward and is located directly below the air distributor, a backwash pipe is provided in the air collecting purification tank, one end of the backwash pipe penetrates from the side wall of the air collecting purification tank, the inner end of the backwash pipe is connected to a nozzle, the nozzle is located directly above the steady flow filter, the top of the air collecting purification tank is connected to the air collecting pipe, and an air collecting pressure transmitter and an air collecting temperature transmitter are provided on the air collecting purification tank; A booster pump is connected to the gas collecting pipe and is connected to the tail gas distribution station.
[0005] Furthermore, the top of the flash slurry balance tower is connected to a fugitive tail gas pipe, and the fugitive tail gas pipe is connected to a water vapor separator.
[0006] Furthermore, the side wall of the flash slurry balance tower is provided with a slurry overflow port, a slurry outlet, a slurry pressure regulating port and a slurry pressure reducing regulating port, and the height of the slurry outlet is higher than the slurry pressure reducing regulating port and lower than the slurry pressure regulating port.
[0007] Furthermore, the flash tank is provided with a flash pressure transmitter, a flash temperature transmitter and a flash mechanical pressure gauge.
[0008] Furthermore, a gas collecting sewage pipe is connected to the bottom end of the gas collecting purification tank, and a gas collecting sewage pipe is provided with a gas collecting sewage valve.
[0009] Furthermore, the exhaust gas distribution station comprises an exhaust gas main pipe, a plurality of exhaust gas branch pipes are connected to the exhaust gas main pipe, and a distribution pressure transmitter and a distribution mechanical pressure gauge are arranged on the exhaust gas main pipe.
[0010] The beneficial effects of the present invention are as follows: a flash slurry balance tower and a gas collection purification tank are arranged on one side of the flash tank, and the tail gas discharged after flash evaporation in the flash tank is input into the gas collection purification tank for filtering and treatment through a steady flow filter, so as to prevent the tail gas from being discharged to pollute the surrounding environment and prevent the valuables from being lost with the waste gas, and the filtered tail gas can be easily recycled and utilized to save energy and protect the environment; the slurry after flash evaporation is input into the flash slurry balance tower to completely separate the water vapor from the residual gas therein, and the use effect is good. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a structural schematic diagram of the present invention; In the figure, 1-flash slurry balance tower, 2-flash discharge pipe, 3-slurry overflow port, 4-slurry outlet, 5-slurry pressure regulating port, 6-slurry pressure reducing regulating port, 7-escape tail gas pipe, 8-water vapor separator, 9-flash tank, 10-flash tail gas pipeline, 11-flash pressure transmitter, 12-flash temperature transmitter, 13-flash mechanical pressure gauge, 14-gas collection and purification tank, 15-steady flow filter, 16-gas distributor, 17-gas outlet, 18-recoil Pipe washing, 19-nozzle, 20-gas collecting pipe, 21-gas collecting pressure transmitter, 22-gas collecting temperature transmitter, 23-boosting pump, 24-exhaust gas distribution station, 241-exhaust main pipe, 242-exhaust branch pipe, 243-distribution pressure transmitter, 244-distribution mechanical pressure gauge, 245-emergency drain pipe, 246-drain valve, 25-double helix ribbon agitator, 26-gas collecting drain pipe, 27-gas collecting drain valve, 28-manhole, 29-slurry inspection port. DETAILED DESCRIPTION
[0012] The present invention is described in detail below in conjunction with the accompanying drawings: like Figure 1As shown, a nickel matte pressurized oxygen leaching flash tail gas heat energy comprehensive utilization device comprises a flash slurry balance tower 1, the flash slurry balance tower 1 is used to treat the flash slurry, the lower part of the flash slurry balance tower 1 is connected with a flash discharge pipe 2, the side wall of the flash slurry balance tower 1 is also provided with a slurry overflow port 3, a slurry outlet 4, a slurry pressure regulating port 5 and a slurry pressure reducing regulating port 6, the slurry treated by the flash slurry balance tower 1 can be discharged through the slurry outlet 4, the height of the slurry outlet 4 is higher than the slurry outlet 6. The slurry pressure reduction regulating port 6 is lower than the slurry pressure regulating port 5. When the flash pressure in the flash tank 1 begins to increase, in addition to the increase in the flow rate of the flash tail gas, the slurry level in the flash tank 9 tends to decrease, and the slurry level in the flash slurry balance tower 1 increases accordingly, and the static pressure gradually increases. When the flash pressure in the flash tank 9 begins to decrease, in addition to the decrease in the flow rate of the flash tail gas, the slurry level in the flash tank 9 tends to increase, and the slurry level in the flash slurry balance tower 1 decreases accordingly, and the static pressure gradually decreases to maintain To ensure that the flashing effect of the flash tank 1 is basically stable, valves are provided on the slurry outlet 4, the slurry pressure regulating port 5 and the slurry pressure reducing regulating port 6. To adapt to the flashing effect of slurries with different densities, when the flashing pressure is continuously high, the slurry pressure reducing regulating port 6 can be used for discharging to reduce the static pressure generated by the flash slurry balancing tower 1 on the flash tank 9. When the flashing pressure is continuously low, the slurry pressure regulating port 5 can be used for discharging to increase the static pressure generated by the flash slurry balancing tower 1 on the flash tank 9. A stirring device is provided in the slurry balancing tower 1, specifically a double-helix belt agitator 25 can be used, and the double-helix belt agitator 25 can be used to stir the slurry after flash evaporation, so that the residual gas in the slurry can be further volatilized. The top of the flash evaporation slurry balancing tower 1 is also connected to a fugitive exhaust pipe 7, and the fugitive exhaust pipe 7 is connected to a water vapor separator 8. Part of the gas in the flash evaporation slurry balancing tower 1 can be discharged from the fugitive exhaust pipe 7 to the water vapor separator 8 for water vapor separation, and the separated condensed water is returned to the production system for reuse.
[0013] The flash discharge pipe 2 is connected to the flash tank 9. The connection height between the flash discharge pipe 2 and the flash slurry balance tower 1 is lower than the connection height between the flash discharge pipe 2 and the flash tank 9. The material after flashing in the flash tank 9 can be discharged from the flash discharge pipe 2 to the flash slurry balance tower 1. The top of the flash tank 9 is connected to the flash exhaust gas pipeline 10. The exhaust gas discharged after flashing in the flash tank 9 can be discharged through the flash exhaust gas pipeline 10. In addition, the flash tank 9 is also provided with a flash pressure transmitter 11, a flash temperature transmitter 12 and a flash mechanical pressure gauge 13.
[0014] A gas collecting and purifying tank 14 is provided on one side of the flash tank 9, and a flash tail gas pipe 10 passes through the gas collecting and purifying tank 14 from the side wall thereof. A steady flow filter 15 having a planar mesh structure and a gas distributor 16 having an inverted umbrella-shaped mesh structure are provided in the gas collecting and purifying tank 14. The steady flow filter 15 is located at the upper part of the gas collecting and purifying tank 14, and the steady flow filter 15 can specifically adopt an existing conventional vapor-liquid filter net. The gas distributor 16 is located in the middle part of the gas collecting and purifying tank 14. The flash tail gas pipe 10 is located in the gas collecting and purifying tank 14, and one end thereof forms an outlet end 17. The outlet end 17 faces vertically upward and is located directly below the gas distributor 16, corresponding to the tip of the bottom of the gas distributor 16. The tail gas entering the gas collecting and purifying tank 14 through the flash tail gas pipe 10 can be evenly distributed in the gas collecting and purifying tank 14 through the gas distributor 16 and It moves slowly upwards and then is filtered through a steady flow filter 15. A backwash pipe 18 is provided in the gas collecting purification tank 14. One end of the backwash pipe 18 passes through the side wall of the gas collecting purification tank 14. The outer end of the backwash pipe 18 is connected to a water source. The inner end of the backwash pipe 18 is connected to a nozzle 19. The nozzle 19 is located directly above the steady flow filter 15. The water sprayed by the nozzle 19 backwashes the steady flow filter 15 to ensure a steady flow effect and prevent the flash exhaust gas from being deflected or overall blocked due to local blockage of the steady flow filter 15, which reduces the flow rate of the flash exhaust gas. The purified exhaust gas can be discharged from the gas collecting pipe 20. The gas collecting purification tank 14 is also provided with a gas collecting pressure transmitter 21 for monitoring the nickel pressure of the gas collecting purification tank 14 and a gas collecting temperature transmitter 22 for monitoring the temperature inside the gas collecting purification tank 14.
[0015] The gas collecting pipe 20 is connected to a boost pump 23, and the boost pump 23 is connected to an exhaust gas distribution station 24. The exhaust gas distribution station 24 can distribute the purified exhaust gas to different equipment for utilization. Specifically, the exhaust gas distribution station 24 includes an exhaust gas main pipe 241, and a plurality of exhaust gas branch pipes 242 are connected to the exhaust gas main pipe 241. In this embodiment, three exhaust gas branch pipes 242 are connected. A distribution pressure transmitter 243 and a distribution mechanical pressure gauge 244 are provided on the exhaust gas main pipe 241. An emergency drain pipe 245 is also connected to the exhaust gas main pipe 241, and a drain valve 246 is provided on the emergency drain pipe 245.
[0016] The bottom end of the gas collecting and purifying tank 14 is connected with a gas collecting and purifying pipe 26 , on which a gas collecting and purifying pipe 26 is provided with a gas collecting and purifying valve 27 , through which the sewage in the gas collecting and purifying tank 14 can be discharged.
[0017] In addition, a manhole 28 and a slurry inspection port 29 are provided at the lower part of the flash slurry balancing tower 1 , which are used to observe the operation status and slurry in the flash slurry balancing tower 1 , respectively.
[0018] The use of the present invention is as follows: The slurry with a pressurized leaching pressure of 1.0MPa and a pressure autoclave discharge temperature of 175.3°C is discharged into a flash tank 9 for flash evaporation. The slurry temperature after flash evaporation is 98°C. The gas generated after flash evaporation is discharged into a gas collection purification tank 14 through a flash tail gas pipeline 10. The slurry after flash evaporation is discharged from a flash evaporator discharge pipe 2 into a flash slurry balance tower 1 for stirring. Part of the gas in the slurry is discharged, and the discharged gas is discharged into a water vapor separator 8 through a dissipated tail gas pipe 7 for water vapor separation. The gas pressure input into the gas collection purification tank 14 is 0.045MPa. In the gas purification tank 14, the gas is evenly distributed in the gas collection purification tank 14 through a gas distributor 16 and slowly It moves upward, then passes through the steady flow filter 15 for filtration and purification and then is discharged. The filtration and purification can effectively prevent a small amount of slurry particles carried in the flash exhaust gas from being discharged with the exhaust gas, thereby avoiding the loss of valuable metals and preventing environmental pollution. The discharge pressure is 0.37MPa, which effectively reduces the exhaust gas pressure and prevents the pressure in the flash tank 1 from increasing, affecting the subsequent flash evaporation effect. Finally, it is input to the exhaust gas distribution station 24 through the gas collecting pipe 20 under the action of the booster pump 23. The purified exhaust gas can be distributed to different equipment for reuse through the exhaust gas distribution station 24, and the purified exhaust gas can prevent corrosion of related equipment, effectively realizing the utilization of exhaust gas, and saving energy and protecting the environment.
[0019] The use of this device can achieve a thermal energy utilization rate of flash tail gas of 66.9% and a slurry particle recovery rate of 98%.
Claims
1. A device for comprehensive utilization of thermal energy of nickel matte pressurized oxygen immersion flash tail gas, characterized in that: include: A flash slurry balance tower (1), wherein a double-helix ribbon agitator (25) is provided in the flash slurry balance tower (1), and a flash evaporator discharge pipe (2) is connected to the lower part of the flash slurry balance tower (1); A flash tank (9), the flash tank (9) being connected to a flash evaporator discharge pipe (2), and the top of the flash tank (9) being connected to a flash tail gas pipeline (10); A gas collection and purification tank (14), wherein the gas collection and purification tank (14) is arranged on one side of the flash tank (9), the flash tail gas pipeline (10) penetrates into the gas collection and purification tank (14) from the side wall of the gas collection and purification tank (14), and the gas collection and purification tank (14) is provided with a steady flow filter (15) in the form of a flat mesh plate structure and a gas distributor (16) in the form of an inverted umbrella mesh plate structure, the steady flow filter (15) is located at the upper part of the gas collection and purification tank (14), the gas distributor (16) is located at the middle part of the gas collection and purification tank (14), and one end of the flash tail gas pipeline (10) in the gas collection and purification tank (14) is shaped like a A gas outlet end (17) is formed, the gas outlet end (17) faces vertically upward and is located directly below the gas distributor (16); a backwash pipe (18) is provided in the gas collection purification tank (14); one end of the backwash pipe (18) passes through the side wall of the gas collection purification tank (14); the inner end of the backwash pipe (18) is connected to a nozzle (19); the nozzle (19) is located directly above the steady flow filter (15); the top end of the gas collection purification tank (14) is connected to a gas collection pipe (20); and a gas collection pressure transmitter (21) and a gas collection temperature transmitter (22) are provided on the gas collection purification tank (14); A booster pump (23), the booster pump (23) being connected to the gas collecting pipe (20), and the booster pump (23) being connected to an exhaust gas distribution station (24).
2. A device for comprehensive utilization of thermal energy of nickel matte pressurized oxygen immersion flash tail gas according to claim 1, characterized in that: The top of the flash slurry balance tower (1) is connected to a fugitive tail gas pipe (7), and the fugitive tail gas pipe (7) is connected to a water vapor separator (8).
3. The device for comprehensive utilization of thermal energy of nickel matte pressurized oxygen immersion flash tail gas according to claim 1, characterized in that: The side wall of the flash slurry balance tower (1) is provided with a slurry overflow port (3), a slurry outlet (4), a slurry pressure regulating port (5) and a slurry pressure reducing regulating port (6); the height of the slurry outlet (4) is higher than the slurry pressure reducing regulating port (6) and lower than the slurry pressure regulating port (5).
4. The device for comprehensive utilization of thermal energy of nickel matte pressurized oxygen immersion flash tail gas according to claim 1, characterized in that: The flash tank (9) is provided with a flash pressure transmitter (11), a flash temperature transmitter (12) and a flash mechanical pressure gauge (13).
5. The device for comprehensive utilization of thermal energy of nickel matte pressurized oxygen immersion flash tail gas according to claim 1, characterized in that: The bottom end of the gas collection and purification tank (14) is connected to a gas collection and sewage discharge pipe (26), and a gas collection and sewage discharge valve (27) is provided on the gas collection and sewage discharge pipe (26).
6. The device for comprehensive utilization of thermal energy of nickel matte pressurized oxygen immersion flash tail gas according to claim 1, characterized in that: The exhaust gas distribution station (24) comprises an exhaust gas main pipe (241), a plurality of exhaust gas branch pipes (242) are connected to the exhaust gas main pipe (241), and a distribution pressure transmitter (243) and a distribution mechanical pressure gauge (244) are provided on the exhaust gas main pipe (241).