A noble liquid zinc powder displacement reaction system and control method

Abstract

The application discloses a kind of noble liquid zinc powder replacement reaction systems and control method thereof, belong to the field of dressing and smelting.The bottom end of deoxidation tower is connected with deoxidation tower liquid discharge pipe in system.Deoxidation tower liquid discharge pipe lower end is connected with circulating pump feed pipe and replacement pump feed pipe respectively.Circulating pump feed pipe is connected with circulating pump discharge pipe with pressure gauge by circulating pump.Circulating pump discharge pipe is connected with mixing tank feed pipe and is connected with circulating pipe by pipeline with valve.Mixing tank feed pipe is equipped with electromagnetic flowmeter and valve.Replacement pump feed pipe end with flowmeter and valve is connected with mixing tank discharge pipe and is connected with replacement cabinet by replacement pump and replacement pump outlet pipe.Replacement cabinet outlet main pipeline is connected with circulating pipe by pipeline with valve and is connected with replacement cabinet barren liquid pipe.Circulating pipe is connected with noble liquid pool, and replacement cabinet barren liquid pipe is connected with barren liquid pool.Solve the problem of scale formation of mixing device, improve the uniformity of zinc slurry and the stability of input replacement cabinet, strengthen the deoxidation effect of noble liquid, reduce the index fluctuation of barren liquid after replacement.

Description

TECHNICAL FIELD

[0001] The application relates to a noble liquid zinc powder displacement reaction system and a control method thereof, and belongs to the technical field of gold dressing engineering. BACKGROUND

[0002] At present, gold is extracted from cyanide gold-silver-containing noble liquid through zinc powder displacement, which is a mainstream process method adopted by domestic gold dressing plants. The operation process comprises the following steps in sequence: noble liquid purification, noble liquid deoxidation, zinc powder addition, and solid-liquid separation.

[0003] Noble liquid purification refers to obtaining clarified noble liquid by using a filtering device to remove residual solid impurities in leaching and washing noble liquid and reaction deposits of impurity ions in liquid. The device is generally a compartment filter press or a plate-and-frame filter press.

[0004] Noble liquid deoxidation refers to that the purified noble liquid enters a deoxidation tower under the action of vacuum and is sprayed onto a packing layer through a spraying device, a liquid film is formed on the surface of the packing layer and flows downward, and dissolved oxygen in the liquid overflows in the vacuum environment, so that deoxidation is completed. The device is generally a deoxidation tower.

[0005] Zinc powder addition refers to that zinc powder is stably and uniformly added into the deoxidized noble liquid through a feeding device, a mixing device and a self-circulation device. The device is generally composed of a feeding pipe, a zinc powder mixing tank, a zinc powder feeding machine and a discharge pipe. The feeding pipe is installed as a branch pipe at the pressure end of the main pipeline at the outlet of the displacement pump, and the discharge pipe is installed as a branch pipe at the negative pressure end of the main pipeline at the inlet of the displacement pump. During the operation of the displacement pump, the pressure difference between the inlet and outlet drives the fluid to form a forced circulation. The zinc slurry formed by mixing in the zinc powder mixing tank is stably transported to the displacement cabinet through the main pipeline under the continuous circulation action, so as to realize efficient mixing and stable transportation of the zinc powder and the deoxidized noble liquid and provide mixed and uniform zinc slurry for the displacement reaction.

[0006] Solid-liquid separation refers to that the displacement reaction is immediately carried out after the zinc powder is added into the noble liquid, and the solid and the barren liquid are subjected to solid-liquid separation in a plate-and-frame filter press. The device is generally a plate-and-frame filter press.

[0007] In production and use, the noble liquid zinc powder displacement reaction system as the prior art has the following main problems:

[0008] Firstly, in the case of constant flow feeding, as the filtration resistance of the displacement cabinet increases, the outlet pressure of the displacement pump increases, the liquid pressure in the feeding pipe of the mixing tank increases, the liquid level in the mixing tank changes, and the gas-liquid-solid interface in the mixing tank is formed with zinc powder scaling, which reduces the effective volume of the mixing tank, is not conducive to uniform mixing of the zinc powder, causes fluctuation of the barren liquid index, and increases the cleaning workload.

[0009] Second, the mixing tank, feed pipe and discharge pipe for a long time zinc slurry circulation, zinc powder and gold, silver and other impurity ions in the liquid reaction, mixed tank, mixed tank feed pipe, mixed tank discharge pipe inner surface easy to form product fouling, block the pipeline, seriously affect the stable input of zinc powder displacement cabinet, resulting in the fluctuation of the poor liquid index, also increases the cleaning workload.

[0010] Third, the zinc powder mixed tank zinc powder and liquid mixing process, due to the small flow of mixed liquid, weak disturbance, leading to uneven mixing of zinc slurry, not conducive to the stable delivery of zinc powder, prone to cause the fluctuation of the poor liquid index. Mixed tank zinc slurry is easy to react with the noble liquid, deposit, scale, causing the accumulation of precious metals, while reducing the effective volume of the mixed tank, deteriorating the reaction environment, and further increasing the cleaning workload.

[0011] Fourth, the zinc powder feeding amount is large during the hanging slurry process. In order to ensure the stability of the liquid-solid ratio and improve the uniformity of zinc slurry mixing, the circulation flow must be increased, and the inlet and outlet pipeline valve opening is increased. Under the condition of using the float ball valve to control the liquid level of the mixing tank, the liquid level in the mixing tank decreases, the effective mixing area volume of the solid-liquid two-phase flow in the tank decreases, causing uneven mixing of zinc slurry during hanging slurry, scaling of the mixing tank, causing fluctuation of the poor liquid index, and further increasing the cleaning workload.

[0012] From the above discussion, it can be seen that the problems of unstable pressure of the feed pipe of the mixing device, zinc powder scattering, zinc slurry circulation mixing feeding mode, small flow of mixed liquid in the mixing tank, weak mixing disturbance in the mixing tank, change of the circulation flow of the adding operation and fluctuation of the liquid level in the mixing tank, etc. cause the scaling of the zinc powder adding device, affect the stable delivery of zinc powder, cause the fluctuation of the poor liquid index and increase the labor intensity of workers.

[0013] The engineering and technical personnel in the field have taken many measures to solve the problem of fluctuation of the liquid level in the mixing tank. For example, the Chinese utility model patent with the authorization announcement number CN207405215U discloses "a gold mud displacement device", which uses a computer to reasonably control the opening state of each valve according to the monitoring results of the liquid level controller and flowmeter, to ensure that the liquid level in the upper tank remains stable, solves the problem of large displacement index fluctuation, and reduces the labor intensity of workers. However, in actual production, the flowmeter is installed on the zinc slurry circulation pipeline, and the surface of the sensor in the flowmeter is easy to scale, causing the flow data to deviate, resulting in the failure of the liquid level control system, and the inevitable scaling of the upper ore pipeline ultimately affects the stability of the liquid level in the upper tank.

[0014] The engineering and technical personnel in the field have taken many measures to address the problems of fluctuation of the mixing tank liquid level and weak mixing strength. For example, the Chinese invention patent application with publication number CN112705064A discloses a "solid-liquid mixer", which adds a liquid level controller, stirring, liquid level sound and light alarm, liquid level scale and central float to the mixer. The device realizes accurate monitoring of the liquid level, ensures uniform mixing of zinc powder in the zinc powder hopper, and has high work efficiency. However, the mixer has many auxiliary devices and a complex structure, which reduces the stability of the device to some extent.

[0015] The engineering and technical personnel in the field have also taken many measures to address the scaling formed in the mixing tank and pipeline by the zinc slurry circulating mixing and feeding method. For example, the Chinese utility model patent with publication number CN208260700U discloses a "zinc powder adding system for poor liquid slurry preparation", which uses poor liquid as zinc powder slurry preparation liquid and uses liquid level control float, connecting rod and poor liquid pipeline valve to realize the stability of the slurry liquid level in the mixing tank. Reducing the content of impurities in the mixing liquid can reduce the scaling problem of the pipeline, but the poor liquid used in the patent technology is not deoxidized, which destroys the low-oxygen reaction environment and causes the increase of zinc powder consumption and the dissolution of precipitated gold; at the same time, the liquid level control mechanism cannot realize constant liquid level according to the change of circulating flow, causing fluctuation of the mixing space of the mixing tank.

[0016] The engineering and technical personnel in the field have also taken other measures to address the weak mixing disturbance of the mixing tank. For example, the paper "Condition optimization and application of zinc powder replacement system in gold smelting plant" (author: Lian Jian, China Metal Bulletin, 2021, (11): 9-10) points out that in the optimization and application of replacement production, the structure of the zinc powder mixing barrel is improved, the mixing paddle of the mixing barrel is increased by about 1 cm, the stirring intensity and mixing uniformity of the zinc powder are improved, and the amount of slurry zinc powder is reduced under the condition of ensuring the poor liquid index. The cleaning work of the zinc powder barrel and the pipeline is reduced to once a month. This study also uses mechanical stirring to ensure mixing uniformity and increases the stirring paddle to improve mixing strength. The study also uses reducing the amount of slurry zinc powder to slow down scaling, which can only slow down the formation of zinc powder scaling during the slurry process, but cannot solve the scaling problem in the entire production of zinc powder feeding.

[0017] From the above disclosure documents, it can be seen that the engineering and technical personnel have not given a more comprehensive solution to the above problems.

[0018] The inventor of the present application analyzes the field observation and concludes that there are two types of scaling in zinc powder adding operation: one is oxidation scaling of non-main reaction, and the other is product scaling of main reaction.

[0019] The non-main reaction oxidation scale refers to the oxidation scale formed by the zinc powder deposited at the junction of solid, liquid and gas in the mixing tank during falling. The zinc powder in the oxidation scale does not participate in the displacement reaction of the precious liquid, and the surface of the scale will have oxidation exothermic, and the temperature is greater than 50 DEG C when it is serious. With the accumulation of the scale, the effective space of the mixing tank is occupied, and the mixing function of the mixing tank is affected, and the function can be restored by stopping and cleaning manually.

[0020] The main reaction product scale refers to the scale formed by the product of the displacement reaction of the zinc powder and the ions in the precious liquid deposited on the wall of the tank or the pipe. The product scale is the product of the displacement reaction of the zinc powder and the precious liquid, and the main characteristic is that the content of gold and silver in the scale is high. With the circulation of the feeding mode, the product scale will increase, which will cause a certain amount of metal accumulation, and the effective volume of the mixing tank will be reduced, the feeding pipe and the discharge pipe of the mixing tank will be blocked, and the mixing function of the mixing tank and the stability of the zinc powder feeding will be affected, and the function can be restored by stopping and cleaning manually.

[0021] The inventors of the present application sample and analyze the product scale in the mixing tank and the feeding and discharging pipe, and the main elements and contents of the scale are as follows: the content of gold is 40.17%, the content of silver is 48.62%, the content of zinc is 1.89%, the content of copper is 1.05%, the content of lead is 0.32%, and the content of iron is 0.21%. It can be seen from the analysis result that the product scale is mainly formed due to the continuous mixing and feeding of the zinc powder adding device, so that the displacement reaction of the zinc powder and the precious liquid is always occurring in the device, and the continuous reaction product is deposited on the wall of the tank and the pipe, and finally causes the product scale of the mixing tank, the feeding pipe of the mixing tank and the discharge pipe of the mixing tank. SUMMARY

[0022] The technical problem to be solved by the present application is to provide a precious liquid zinc powder displacement reaction system and a control method thereof, which solves the scale problem of the mixing device during the zinc powder adding operation, improves the uniformity of the zinc slurry and the stability of the input displacement cabinet, reduces the fluctuation of the poor liquid index after displacement, and reduces the workload of workers cleaning the scale.

[0023] The technical scheme of the present application is as follows:

[0024] The application discloses a kind of noble liquid zinc powder replacement reaction systems, vacuum gauge is installed in the top of deoxidizing tower, and deoxidizing tower feed pipe and deoxidizing tower vacuum pipe are connected respectively, deoxidizing tower feed pipe is connected with noble liquid pool, the upper end of mixing tank is equipped with zinc powder feeder, the lower end is equipped with the fourth valve, and the side is connected with mixing tank supply pipe, the inlet of replacement cabinet is connected with the outlet pipe of replacement pump, and the bottom of deoxidizing tower is connected with the liquid discharge pipe of deoxidizing tower with the fifth valve;The lower end of deoxidizing tower liquid discharge pipe is connected with circulating pump feed pipe and replacement pump feed pipe respectively;Circulating pump feed pipe is installed with the seventh valve, and is connected with the discharge pipe of circulating pump with pressure gauge by circulating pump;Circulating pump discharge pipe is connected with mixing tank supply pipe, and is connected with circulating pipe by pipeline with the sixth valve;Second electromagnetic flowmeter and third valve are installed on mixing tank supply pipe;Replacement pump feed pipe with first electromagnetic flowmeter and eighth valve is connected with replacement pump outlet pipe by replacement pump, and is connected with fourth valve by mixing tank discharge pipe;Replacement cabinet outlet main pipeline is connected with circulating pipe by pipeline with second valve, and is connected with replacement cabinet poor liquid pipe with first valve;Replacement cabinet circulating pipe is connected with noble liquid pool.

[0025] Preferably, the tank body of the mixing tank comprises four upper side wall plates surrounding a cuboid space, each of the four upper side wall plates is perpendicular to the horizontal plane and is connected with a lower side wall plate at the lower side; one of the lower side wall plates is an abrupt slope tank wall with an angle β with the horizontal plane, 60°≤β<90°; the opposite lower side wall plate of the abrupt slope tank wall is a gentle slope tank wall with an angle γ with the horizontal plane, 30°≤γ≤75°; the upper end of the tank body is covered with a cover plate; the cover plate is provided with a feeding port, and the feeding port of the zinc powder feeder is communicated with the feeding port.

[0026] Further preferably, a mixing tank feed pipe is installed inside the mixing tank and arranged vertically to the horizontal plane, the upper end of the mixing tank feed pipe is connected with the mixing tank supply pipe penetrating from the upper side wall plate, and the lower end is close to the upper end of the gentle slope tank wall and is immersed below the liquid level in the tank.

[0027] Still further preferably, a liquid level control mechanism is installed above the gentle slope tank wall inside the mixing tank; the liquid level control mechanism comprises a butterfly valve installed at the lower end of the mixing tank feed pipe, and the control rod of the butterfly valve is connected with a first connecting rod; the liquid level control mechanism further comprises a second connecting rod arranged vertically to the horizontal plane; the outer end of the first connecting rod is connected with the lower end of the second connecting rod through a pin shaft; the second connecting rod is successively sleeved with a lock nut, a second spring, a floating ball and a limiting block from bottom to top; the second connecting rod is provided with a low flow rate limiting groove and a high flow rate limiting groove; the low flow rate limiting groove is located below the limiting block, and the high flow rate limiting groove is located above the limiting block.

[0028] Still further preferably, the section of the second connecting rod between the low flow rate limiting groove and the high flow rate limiting groove is a threaded rod; and the limiting block is a nut matched with the threaded rod.

[0029] Preferably, the mixing tank is internally provided with a height-adjustable material binder; the material binder is a circular truncated cone cylinder with both ends open and the upper port larger than the lower port, the angle between the generatrix of the circular truncated cone cylinder and the horizontal plane is α, 40°≤α<90°; the center of the inlet port, the axis of the material binder and the center of the lower port of the tank body are on the same vertical line, and the vertical line is close to one side of the steep slope tank wall.

[0030] Further preferably, the material binder is connected with a lifting rod through a support rod; the lifting rod is arranged vertically to the horizontal plane and penetrates through the cover plate; a threaded adjusting nut is connected on the lifting rod and located on the upper side of the cover plate, and a first spring is sleeved between the cover plate and the support rod.

[0031] The control method of the noble liquid zinc powder displacement reaction system is as follows:

[0032] I. Noble liquid deoxygenation:

[0033] A negative pressure is formed in the deoxygenation tower through the vacuum pipe of the deoxygenation tower, and the noble liquid in the noble liquid pool is sucked into the deoxygenation tower through the deoxygenation tower feed pipe to carry out noble liquid deoxygenation; when the vacuum display number of the deoxygenation tower is ≤-0.09 MPa and the display number reaches stability, the next step is entered;

[0034] II. Start the deoxygenation circulating equipment

[0035] The fifth valve, the sixth valve and the fourth valve are opened in sequence, the circulating pump is started, and the seventh valve is opened; under the action of the circulating pump, the deoxygenated noble liquid in the deoxygenation tower flows into the noble liquid pool through the deoxygenation tower liquid discharge pipe, the circulating pump feed pipe, the circulating pump outlet pipe and the circulating pipe; the third valve is opened, and the opening degree of the sixth valve is adjusted so that the pressure display number is ≥0.4 MPa; part of the deoxygenated noble liquid in the circulating pump outlet pipe flows into the mixing tank through the mixing tank feed pipe, passes through the second electromagnetic flowmeter and the mixing tank feed pipe, and enters the mixing tank; when the liquid level in the mixing tank is stable, the next step is entered;

[0036] III. Start the zinc powder displacement equipment

[0037] The second valve is opened, the displacement pump is started, and the eighth valve is opened; under the action of the displacement pump, the deoxygenated noble liquid in the deoxygenation tower flows into the displacement pump through the deoxygenation tower liquid discharge pipe, and the deoxygenated noble liquid in the mixing tank flows into the displacement pump through the mixing tank discharge pipe; the liquid flows into the displacement cabinet through the displacement pump outlet pipe, and then flows into the noble liquid pool through the circulating pipe; when the flow rate V1 of the first electromagnetic flowmeter and the flow rate V2 of the second electromagnetic flowmeter are stable, the next step is entered;

[0038] IV. Hanging slurry of the displacement cabinet and production

[0039] The position of the limiting block to the high flow rate limiting groove is adjusted, and the opening degree of the fourth valve is adjusted to increase; when the liquid level in the mixing tank is stable, the second electromagnetic flowmeter display number V2 meets 3m 3 / h≤V2≤50m3 / h and the number reaches stability, the zinc powder is added to the mixing tank through the zinc powder feeder to start the zinc powder slurry, and after the zinc powder is added, the slurry is ended; the running frequency of the zinc powder feeder is adjusted to the normal feeding speed, the zinc powder is supplemented through the zinc powder feeder, the opening degree of the fourth valve is adjusted to be reduced, and when the number V2 of the second electromagnetic flow meter satisfies 0 < V2 < 50 m 3 / h and the number reaches stability, the zinc powder is added to the mixing tank through the zinc powder feeder to start the zinc powder slurry, and after the zinc powder is added, the slurry is ended; the running frequency of the zinc powder feeder is adjusted to the normal feeding speed, the zinc powder is supplemented through the zinc powder feeder, the opening degree of the fourth valve is adjusted to be reduced, and when the number V2 of the second electromagnetic flow meter satisfies 0 < V2 < 50 m

[0040] Compared with the prior art, the present application has the following beneficial effects:

[0041] Firstly, by changing the zinc slurry circulating feeding mode and using the deoxidized precious liquid as the zinc powder mixed liquid, the problem of product scaling in the mixing tank feeding pipe is completely solved, and the product scaling in the mixing tank and the mixing tank discharge pipe is also reduced. Specifically, the system changes the zinc slurry circulating feeding mode, so that the flow in the mixing tank is increased, the residence time of zinc powder and precious liquid in the mixing device is shortened, the generation amount of reaction deposits is reduced, and with the increase of liquid scouring effect, the main reaction deposits in the mixing tank and the mixing tank discharge pipe are greatly reduced.

[0042] Secondly, the system optimizes the falling path of the zinc powder, the falling process of the zinc powder is constrained, and the oxidation scaling in the mixing tank is reduced. Specifically, a special zinc powder channel is designed in the mixing tank of the system. After adjusting the height of the beam feeder, the beam feeder can control the zinc powder to flow in a specific path during the falling process of the zinc powder from the zinc powder feeder, reduce the scattering of the zinc powder, and reduce the oxidation deposition of the zinc powder at the gas-liquid-solid interface. At the same time, since the center of the zinc powder feeder discharge port, the axis of the beam feeder and the center of the mixing tank discharge port are on the same vertical line, and the vertical line is close to one side of the steep slope tank wall, it can ensure that the falling path of the zinc powder is shortened, and the deposition of the zinc powder at the tank bottom is reduced.

[0043] Thirdly, the power for supplying liquid to the mixing tank in the system comes from the circulating pump. It ensures the constant high-pressure liquid supply of the mixing tank, which is more beneficial to the liquid level control of the mixing tank and the mixing of zinc powder. When the system works, the circulating pump provides stable high-pressure liquid in the mixing tank feeding pipe, which is beneficial to the liquid level control of the mixing tank, increases the fluid shear force and turbulence intensity in the mixing tank, and promotes the solid-liquid mixing. In addition, the circulating pump supplies liquid to the mixing tank feeding pipe, which ensures that only the deoxidized precious liquid is in the pipe, and no chemical reaction occurs in the pipe. The problem of product scaling in the mixing tank feeding pipe is completely solved. With the help of the circulating pump, the self-circulation process of the deoxidized precious liquid is realized, part of the deoxidized precious liquid is deoxidized again, and the deoxidization effect of the precious liquid is strengthened.

[0044] Fourth, the design of the feeding pipe outlet of the mixing tank close to the slope wall of the tank increases the liquid speed difference in the tank, which is beneficial to the mixing of solid and liquid, and at the same time, the flushing of the tank wall is generated, which reduces the deposition and adhesion of zinc powder on the tank wall. Specifically, the close installation of the inclined wall design of the mixing tank and the outlet of the feeding pipe of the mixing tank makes the high-speed fluid of the feeding pipe jet out, and the tangential flow is formed under the limitation of the inclined wall, which causes the speed difference between the fluid in the center area of the mixing tank, and the liquid in the mixing tank is caused to surge, so that the disturbance in the mixing tank is enhanced, which is more beneficial to the suspension and mixing of zinc powder, and at the same time, the high flow rate liquid realizes the flushing of the tank wall, which further prevents the deposition or adhesion of zinc powder or reaction product on the tank wall.

[0045] Fifth, different flow rates are supplied under the fixed liquid level through the liquid level control mechanism, which ensures the mixing space of the zinc powder mixing tank. Specifically, the unique floating ball control mechanism can realize the adjustment of different flow rates under the same liquid level, which meets the requirements of the change of the mixing flow rate during the replacement of zinc powder, and ensures the sufficient and stable mixing space of the mixing tank, which is more beneficial to the mixing of zinc powder and deoxidized noble liquid, and further reduces the formation of oxidation scale caused by liquid level fluctuation.

[0046] Sixth, the system does not increase mechanical stirring and electrical sensing elements, and has the characteristics of compact structure and high self-stability.

[0047] In summary, the system of the application can improve the mixing effect of zinc powder, reduce the scaling of the device, reduce the labor intensity of workers, ensure the stable supply of zinc powder during the replacement process, realize the strengthened deoxidization of noble liquid, improve the on-site index, and reduce the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 is a structure and working principle schematic diagram of an embodiment of the system of the application.

[0049] Figure 2 is a shape structure schematic diagram of the tank body of the mixing tank in the embodiment of the system of the application.

[0050] Figure 3 is a schematic diagram of the internal structure of the mixing tank in the embodiment of the system of the application.

[0051] BRIEF DESCRIPTION OF DRAWINGS:

[0052] 1. Deoxidizing column feed pipe; 2. Deoxidizing column; 3. Deoxidizing column vacuum pipe; 4. Displacement tank poor liquid pipe; 5. First valve; 6. First electromagnetic flowmeter; 7. Displacement tank; 8. Second valve; 9. Third valve; 10. Cover plate; 11. Zinc powder feeder; 12. Bundle feeder; 13. Mixing tank; 14. Liquid level control mechanism; 15. Fourth valve; 16. Second electromagnetic flowmeter; 17. Circulation pipe; 18. Circulation pump discharge pipe; 19. Deoxidizing column discharge pipe; 20. Mixing tank discharge pipe; 21. Pressure gauge; 22. Fifth valve; 23. Displacement pump outlet pipe; 24. Mixing tank supply pipe; 25. Sixth valve; 26. Circulation pump; 27. Seventh valve; 28. Eighth valve; 29. Displacement pump; 30. Precious liquid pool; 31. Circulation pump feed pipe; 32. Displacement pump feed pipe; 33. Butterfly valve; 34. Mixing tank feed pipe; 35. First connecting rod; 36. Pin; 37. Lock nut; 38. Second spring; 39. Float ball; 40. Low flow rate limiting groove; 41. Limiting block; 42. High flow rate limiting groove; 43. Second connecting rod; 44. Supporting rod; 45. First spring; 46. Adjusting nut; 47. Lifting rod; 48. Upper side wall plate; 49. Steep slope groove wall; 50. Gentle slope groove wall. DETAILED DESCRIPTION

[0053] The present application will be further described below in conjunction with the drawings and examples.

[0054] As Figure 1 , the system embodiment of the present application comprises a mixing tank 13. The mixing tank 13 comprises Figure 2 a mixing tank body as shown in the drawing, which comprises four upper side wall plates 48 surrounding a cuboid space, each of the four upper side wall plates 48 is perpendicular to the horizontal plane and has a lower side connected to a lower side wall plate, the four lower side wall plates surround an eccentric four-prism frustum space which is large at the top and small at the bottom, one of the lower side wall plates is a steep slope groove wall 49 with an angle β of 60°≤β<90° with the horizontal plane, and the lower side wall plate opposite to the steep slope groove wall 49 is a gentle slope groove wall 50 with an angle γ of 30°≤γ≤75° with the horizontal plane. In combination Figure 3 , the upper end of the body is covered with a cover plate 10, a zinc powder feeder 11 is installed above the cover plate 10 and an inlet is formed in the cover plate 10, the feeding port of the zinc powder feeder 11 is communicated with the inlet. The lower end of the body is installed with a fourth valve 15 as a discharge port.

[0055] As Figure 3 , the mixing tank 13 is internally installed with a mixing tank feed pipe 34 which is arranged perpendicular to the horizontal plane, the upper end of the mixing tank feed pipe 34 is connected with a mixing tank supply pipe 24 which penetrates from the upper side wall plate 48, and the lower end is close to the upper end of the gentle slope groove wall 50 and is submerged below the liquid level in the tank.

[0056] The mixing tank 13 is also equipped with a liquid level control mechanism 14 located above the sloped tank wall 50. The liquid level control mechanism 14 includes a butterfly valve 33 installed at the lower port of the mixing tank inlet pipe 34, and the control rod of the butterfly valve 33 is connected to a first connecting rod 35. The liquid level control mechanism 14 also includes a second connecting rod 43 that runs perpendicular to the horizontal plane, and the outer end of the first connecting rod 35 ( Figure 3 The left end of the first connecting rod is connected to the lower end of the second connecting rod 43 via a pin 36. The second connecting rod 43 is fitted with a lock nut 37, a second spring 38, a float 39, and a limiting block 41 sequentially from bottom to top. The float 39 can move the entire connecting rod device up and down as the liquid level rises and falls. The second connecting rod 43 is also provided with a low-flow-rate limiting groove 40 and a high-flow-rate limiting groove 42, with the low-flow-rate limiting groove 40 located below the limiting block 41 and the high-flow-rate limiting groove 42 located above the limiting block 41.

[0057] The limiting block 41 can be fixed at any position between the low-flow-rate limiting groove 40 and the high-flow-rate limiting groove 42 and is used to block the float 39 from above. Figure 3 In order to display the limit groove, the float is not close to the limit block, thereby adjusting the position of the float 39 to stabilize the liquid level in the mixing tank 13.

[0058] Specifically, the section of the second connecting rod 43 located between the low-flow-rate limiting groove 40 and the high-flow-rate limiting groove 42 is a threaded rod, and the limiting block 41 is in the form of a nut that cooperates with the threaded rod.

[0059] The lock nut 37 is fixed on the second connecting rod 43. A second spring 38 is installed between the lock nut 37 and the float 39. The second spring 38 is always in a compressed state, and the elastic force is used to support the float 39.

[0060] like Figure 3 The mixing tank 13 is equipped with a height-adjustable material clamp 12. The material clamp 12 is a frustum-shaped cylinder with open top and bottom, the upper end being larger than the lower end. The angle between the generatrix of the frustum-shaped cylinder and the horizontal plane is α, where 40° ≤ α < 90°. The center of the inlet, the axis of the material clamp 12, and the center of the lower end of the tank are on the same vertical line, and this vertical line is close to the side of the steep slope tank wall 49.

[0061] Specifically, a support rod 44 is welded to the side wall of the material clamp 12. The support rod 44 is inserted into and fixed to the lower end of the lifting rod 47. The lifting rod 47 is perpendicular to the horizontal plane and passes through the cover plate 10. An adjusting nut 46 located on the upper side of the cover plate 10 is threaded onto the lifting rod 47, and a first spring 45 located between the cover plate 10 and the support rod 44 is sleeved on it. The height of the material clamp 12 can be adjusted by adjusting the nut 46.

[0062] Still Figure 1The system embodiment of the present application further comprises a deoxidizing tower 2, a circulating pump 26, a displacement pump 29, a noble liquid pool 30 and a displacement cabinet 7.

[0063] The deoxidizing tower 2 is connected with a deoxidizing tower feed pipe 1 and a deoxidizing tower vacuum pipe 3 at the top end respectively, the deoxidizing tower vacuum pipe 3 is used for connecting a vacuumizing equipment, so that the deoxidizing tower vacuum is formed. The deoxidizing tower 2 is installed with a vacuum table. The deoxidizing tower feed pipe 1 inlet end is immersed in the noble liquid in the noble liquid pool 30 and located at the bottom position of the noble liquid pool 30. The deoxidizing tower 2 bottom end is connected with a deoxidizing tower liquid discharge pipe 19 with a fifth valve 22. The deoxidizing tower liquid discharge pipe 19 lower end is connected with a circulating pump feed pipe 31 and a displacement pump feed pipe 32 respectively. The circulating pump feed pipe 31 is connected with the liquid inlet end of the circulating pump 26, and the circulating pump feed pipe 31 is installed with a seventh valve 27, the liquid outlet end of the circulating pump 26 is connected with a circulating pump discharge pipe 18. The circulating pump discharge pipe 18 is installed with a pressure table 21, the circulating pump discharge pipe 18 is connected with the mixing tank feed pipe 24, and is connected with a circulating pipe 17 through a branch pipe with a sixth valve 25. The mixing tank feed pipe 24 is installed with a second electromagnetic flowmeter 16 and a third valve 9. The displacement pump feed pipe 32 is installed with a first electromagnetic flowmeter 6 and an eighth valve 28. The displacement pump feed pipe 32 tail end (right end) is connected with the liquid inlet end of the displacement pump 29 through a pipe, and is connected with the fourth valve 15 through a mixing tank discharge pipe 20. Specifically, the mixing tank discharge pipe 20 upper end is connected with the fourth valve 15, and the lower end is connected with the displacement pump feed pipe 32 tail end. Figure 1 The liquid outlet end of the displacement pump 29 is connected with the inlet of the displacement cabinet 7 through a displacement pump outlet pipe 23. The outlet main pipe of the displacement cabinet 7 is connected with the circulating pipe 17 through a branch pipe with a second valve 8. The main pipe is also connected with a displacement cabinet lean liquid pipe 4. The outlet end of the displacement cabinet circulating pipe 17 is located in the noble liquid pool 30 and is immersed below the liquid level in the pool. The displacement cabinet lean liquid pipe 4 is installed with a first valve 5, and the outlet end of the displacement cabinet lean liquid pipe 4 is used for connecting a lean liquid pool.

[0064] The liquid outlet end of the displacement pump 29 is connected with the inlet of the displacement cabinet 7 through a displacement pump outlet pipe 23. The outlet main pipe of the displacement cabinet 7 is connected with the circulating pipe 17 through a branch pipe with a second valve 8. The main pipe is also connected with a displacement cabinet lean liquid pipe 4. The outlet end of the displacement cabinet circulating pipe 17 is located in the noble liquid pool 30 and is immersed below the liquid level in the pool. The displacement cabinet lean liquid pipe 4 is installed with a first valve 5, and the outlet end of the displacement cabinet lean liquid pipe 4 is used for connecting a lean liquid pool.

[0065] The following illustrates the working principle and control method of the system of the present application.

[0066] I. Noble liquid deoxidization:

[0067] The vacuumizing equipment is opened, and the negative pressure is formed in the deoxidizing tower 2 through the deoxidizing tower vacuum pipe 3. The noble liquid in the noble liquid pool 30 is sucked into the deoxidizing tower 2 through the deoxidizing tower feed pipe 1 to deoxidize the noble liquid. With the liquid level of the deoxidizing tower 2 rising and the continuous action of the vacuumizing equipment, the pressure of the vacuum table of the deoxidizing tower 2 reaches and stabilizes at-0.09MPa, and the noble liquid entering the deoxidizing tower is deoxidized.

[0068] II. Deoxidizing circulating equipment starting

[0069] At this time, the fifth valve 22, the sixth valve 25, the fourth valve 15 are opened in turn, the circulating pump 26 is opened, and the seventh valve 27 is opened, the deoxygenated noble liquid in the deoxygenation tower 2 flows into the noble liquid pool 30 through the deoxygenation tower liquid outlet pipe 19, the circulating pump inlet pipe 31, the circulating pump 26, the circulating pump outlet pipe 18 and the circulating pipe 17 under the action of the circulating pump 26. The third valve 9 is opened, and the opening degree of the sixth valve 25 is adjusted, so that the pressure gauge 21 shows a number ≥0.4Mpa, and part of the deoxygenated noble liquid in the circulating pump outlet pipe 18 flows into the mixing tank 13 through the mixing tank feeding pipe 24, the second electromagnetic flowmeter 16 and the mixing tank inlet pipe 34, and the liquid level in the mixing tank 13 is stable, and the next step is entered.

[0070] III. Zinc powder replacement equipment start-up

[0071] The second valve 8 is opened, the replacement pump 29 is opened, and the eighth valve 28 is opened, the deoxygenated noble liquid in the deoxygenation tower 2 flows into the replacement pump inlet pipe 32 and the replacement pump 29 through the deoxygenation tower liquid outlet pipe 19 under the action of the replacement pump 29, at the same time, the deoxygenated noble liquid in the mixing tank 13 flows into the replacement pump 29 through the mixing tank liquid outlet pipe 20. The liquid flows into the noble liquid pool 30 through the replacement cabinet 7 and the circulating pipe 17, and the first electromagnetic flowmeter 6 flow rate V1 and the second electromagnetic flowmeter (16) flow rate V2 are stable, and the next step is entered.

[0072] IV. Replacement cabinet hanging slurry and production

[0073] The position of the limiting block 41 to the high flow rate limiting groove 42 is adjusted, and the opening degree of the fourth valve 15 is increased, and the liquid level in the mixing tank 13 is stable, and the second electromagnetic flowmeter 16 reaches and stabilizes at V2=10m 3 / h, 80kg of zinc powder is added to the zinc powder feeder 11 bin, the zinc powder feeder 11 is opened, and the running frequency is adjusted, the zinc powder hanging slurry is started, and after the addition of 80kg of zinc powder is completed, the hanging slurry is ended.

[0074] The running frequency of the zinc powder feeder 11 is adjusted to the normal feeding speed, 10kg of zinc powder is added to the zinc powder feeder 11 bin, the opening degree of the fourth valve 15 is adjusted to be reduced, the flow rate of the second electromagnetic flowmeter 16 is observed to reach and stabilize at V2=3m 3 / h, the limiting block 41 is adjusted to be close to the low flow rate limiting groove 40, so that the mixing tank 13 maintains the original liquid level and is stable, the liquid in the replacement cabinet outlet pipe is continuously taken, the liquid gold concentration is tested, and after the qualified (liquid gold grade below the set value is considered to be qualified, for example, liquid gold grade <0.05mg / L) is obtained, the first valve 5 is opened and the second valve 8 is closed, and the replacement poor liquid is discharged to the poor liquid pool through the replacement cabinet poor liquid pipe 4.

[0075] V. Replacement cabinet metal accumulation amount calculation

[0076] In order to avoid the displacement of the cabinet 7 metal saturation, resulting in filter cloth filter and poor liquid index fluctuation, and better complete the late metal balance work, the need to replace the cabinet metal content statistics, according to the amount of metal adjustment control unloading time.

[0077] Statistical metal content method as follows: technical staff from the first electromagnetic flowmeter 6, 6 cumulative processing capacity Q1 from the second electromagnetic flowmeter 16, 16 cumulative processing capacity Q2, when the class test data liquid gold grade C1, poor liquid gold grade C2.

[0078] Each class metal accumulation calculation .

[0079] When the cabinet metal content reaches saturation (such as reaching 100 kg), stop, unload the cabinet.

[0080] In production, the displacement of the cabinet 7 target processing flow rate for V 目标 =V1+V2.

[0081] Site operators can adjust the fourth valve 15, 25 and the sixth valve 28 opening, according to the mixing strength of the mixing tank, zinc powder feeding amount, deoxidation tower deoxidation effect, to adjust V1, V2, ensure 0≤V1 目标 , 0 3 ≤V2≤50m / h.

[0082] When V1=0, that is, the eighth valve 28 is completely closed, V2=V 目 , the displacement pump 29 into the liquid, single from the mixing tank 13.

[0083] When the circulating pump 26 runs, adjust the sixth valve 25 opening, always keep the pressure gauge 21 reading ≥0.4Mpa.

[0084] Circulating pump 26 outlet circulating pump discharge pipe 18 can also be connected to two or more mixing tank feeding pipe 24 two or more mixing tank, while feeding two or more mixing tank, realize two or more displacement cabinet at the same time production.

Claims

1. A precious liquid zinc powder displacement reaction system, wherein a deoxidation tower (2) equipped with a vacuum gauge is connected to a deoxidation tower feed pipe (1) and a deoxidation tower vacuum pipe (3) at its top, the deoxidation tower feed pipe (1) is connected to a precious liquid tank (30), a zinc powder feeder (11) is provided at the upper end of a mixing tank (13), a fourth valve (15) is provided at the lower end, a mixing tank feed pipe (24) is connected to the side, and the inlet of the displacement cabinet (7) is connected to the displacement pump outlet pipe (23), characterized in that: The bottom of the deoxidation tower (2) is connected to a deoxidation tower drain pipe (19) with a fifth valve (22); the lower end of the deoxidation tower drain pipe (19) is connected to a circulating pump feed pipe (31) and a displacement pump feed pipe (32); a seventh valve (27) is installed on the circulating pump feed pipe (31) and it is connected to a circulating pump discharge pipe (18) with a pressure gauge (21) through the circulating pump (26); the circulating pump discharge pipe (18) is connected to the mixing tank feed pipe (24) and is connected to a circulating pipe (17) through a pipeline with a sixth valve (25); the mixing tank feed pipe is connected to the mixing tank feed pipe (24). The pipe (24) is equipped with a second electromagnetic flow meter (16) and a third valve (9); the feed pipe (32) of the displacement pump with the first electromagnetic flow meter (6) and the eighth valve (28) is connected to the outlet pipe (23) of the displacement pump through the displacement pump (29) and to the fourth valve (15) through the discharge pipe (20) of the mixing tank; the outlet main pipeline of the displacement cabinet (7) is connected to the circulation pipe (17) through the pipeline with the second valve (8) and is connected to the lean liquid pipe (4) of the displacement cabinet with the first valve (5); the circulation pipe (17) is connected to the precious liquid tank (30).

2. The zinc powder replacement reaction system for precious liquid as described in claim 1, characterized in that: The mixing tank (13) includes four upper side wall panels (48) that enclose a rectangular space. The four upper side wall panels (48) are all perpendicular to the horizontal plane and each of them is connected to a lower side wall panel. One of the lower side wall panels serves as a steep slope tank wall (49) with an angle of β with the horizontal plane, where 60°≤β<90°. The lower side wall panel opposite the steep slope tank wall (49) serves as a gentle slope tank wall (50) with an angle of γ with the horizontal plane, where 30°≤γ≤75°. The upper end of the tank is covered with a cover plate (10). The cover plate (10) has an inlet, and the feed port of the zinc powder feeder (11) is connected to the inlet.

3. The zinc powder replacement reaction system for precious liquid as described in claim 2, characterized in that: The mixing tank (13) is equipped with a mixing tank feed pipe (34) that is perpendicular to the horizontal plane. The upper end of the mixing tank feed pipe (34) is connected to the mixing tank supply pipe (24) that passes through the upper side wall plate (48), and the lower end is close to the upper end of the gentle slope tank wall (50) and submerged below the liquid surface in the tank.

4. The zinc powder replacement reaction system for precious liquid as described in claim 3, characterized in that: The mixing tank (13) is equipped with a liquid level control mechanism (14) located above the slope tank wall (50). The liquid level control mechanism (14) includes a butterfly valve (33) installed at the lower port of the mixing tank feed pipe (34). The control rod of the butterfly valve (33) is connected to a first connecting rod (35). The liquid level control mechanism (14) also includes a second connecting rod (43) with its direction perpendicular to the horizontal plane. The outer end of the first connecting rod (35) is connected to the lower end of the second connecting rod (43) through a pin (36). The second connecting rod (43) is fitted with a lock nut (37), a second spring (38), a float (39), and a limiting block (41) from bottom to top. The second connecting rod (43) is provided with a low flow rate limiting groove (40) and a high flow rate limiting groove (42). The low flow rate limiting groove (40) is located below the limiting block (41), and the high flow rate limiting groove (42) is located above the limiting block (41).

5. The zinc powder replacement reaction system for precious liquid as described in claim 4, characterized in that: The second connecting rod (43) is a threaded rod located between the low flow velocity limiting groove (40) and the high flow velocity limiting groove (42); the limiting block (41) is a nut that mates with the threaded rod.

6. The zinc powder replacement reaction system for precious liquid as described in claim 2, characterized in that: The mixing tank (13) is equipped with a height-adjustable material bundler (12); the material bundler (12) is a frustum cylinder with both the upper and lower ends open and the upper end larger than the lower end. The angle between the generatrix of the frustum cylinder and the horizontal plane is α, 40°≤α<90°; the center of the inlet, the axis of the material bundler (12) and the center of the lower end of the tank are on the same vertical line, and the vertical line is close to the side of the steep slope tank wall (49).

7. The zinc powder displacement reaction system for precious liquid as described in claim 6, characterized in that: The feeder (12) is connected to a lifting rod (47) via a support rod (44); the lifting rod (47) is set perpendicular to the horizontal plane and passes through the cover plate (10); the lifting rod (47) is threaded with an adjusting nut (46) located on the upper side of the cover plate (10) and a first spring (45) located between the cover plate (10) and the support rod (44).

8. The control method for the zinc powder displacement reaction system of the precious liquid as described in claim 4 or 5, characterized in that... The control steps are as follows: I. Deoxygenation of precious liquids: A negative pressure is created inside the deoxygenation tower (2) by the vacuum tube (3) of the deoxygenation tower. The precious liquid in the precious liquid pool (30) is drawn into the deoxygenation tower (2) through the feed pipe (1) of the deoxygenation tower for deoxygenation. When the vacuum gauge reading of the deoxygenation tower (2) is ≤-0.09MPa and the reading reaches a stable value, proceed to the next step. II. Start-up of the deoxygenation circulation equipment Open the fifth valve (22), the sixth valve (25), and the fourth valve (15) in sequence, start the circulation pump (26) and open the seventh valve (27) at the same time. Under the action of the circulation pump (26), the deoxygenated precious liquid in the deoxygenation tower (2) flows into the precious liquid pool (30) through the deoxygenation tower discharge pipe (19), the circulation pump feed pipe (31), the circulation pump discharge pipe (18), and the circulation pipe (17). Open the third valve (9) and adjust the opening of the sixth valve (25) so that the pressure gauge (21) reading is ≥0.4Mpa. Part of the deoxygenated precious liquid in the circulation pump discharge pipe (18) flows through the mixing tank feed pipe (24), through the second electromagnetic flow meter (16) and the mixing tank feed pipe (34) into the mixing tank (13). After the liquid level in the mixing tank (13) stabilizes, proceed to the next step. III. Start-up of the zinc powder replacement equipment Open the second valve (8), start the displacement pump (29), and simultaneously open the eighth valve (28). Under the action of the displacement pump (29), the deoxygenated precious liquid in the deoxygenation tower (2) enters the displacement pump feed pipe (32) and displacement pump (29) through the deoxygenation tower discharge pipe (19). The deoxygenated precious liquid in the mixing tank (13) enters the displacement pump (29) through the mixing tank discharge pipe (20). The liquid enters the displacement cabinet (7) through the displacement pump outlet pipe (23) and then flows into the precious liquid pool (30) through the circulation pipe (17). After the flow rate V1 of the first electromagnetic flowmeter (6) and the flow rate V2 of the second electromagnetic flowmeter (16) stabilize, proceed to the next step. IV. Displacement cabinet plastering and production Adjust the position of the limiting block (41) to the high-velocity limiting groove (42), and adjust the opening of the fourth valve (15) to increase it. Wait until the liquid level in the mixing tank (13) is stable and the reading V2 of the second electromagnetic flowmeter (16) meets the 3m 3 / h≤V2≤50m 3 / h and the reading reaches a stable value. Zinc powder is added to the mixing tank (13) via the zinc powder feeder (11) to begin zinc powder slurrying. After the zinc powder is added, the slurrying ends. The operating frequency of the zinc powder feeder (11) is reduced to the normal feeding speed. Zinc powder is replenished via the zinc powder feeder (11), and the opening of the fourth valve (15) is adjusted to decrease. The flow is continued until the reading V2 of the second electromagnetic flowmeter (16) satisfies 0 < V2 < 50m 3 / h and the reading reaches stability, adjust the limit block (41) to move closer to the low flow rate limit tank (40) so that the mixing tank (13) maintains the original liquid level and is stable. Continuously take liquid from the outlet main pipe of the replacement cabinet, test the liquid gold concentration, and after the liquid gold level is qualified, open the first valve (5) and close the second valve (8). After replacement, the lean liquid is discharged to the lean liquid pool through the lean liquid pipe (4) of the replacement cabinet.

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