A selective heavy metal treatment device and method for ammonia leaching wastewater from molybdenum concentrate

Abstract

This application discloses a selective heavy metal treatment device and method for ammonia leaching wastewater from molybdenum concentrate, relating to the field of water pollution control and treatment technology. It includes a treatment tank and an inlet and outlet pipe fixedly connected to the tank. A sleeve is coaxially fitted at the bottom of the inlet pipe. A dosing assembly is installed inside the treatment tank, and a cone is fixedly connected inside the tank. An auxiliary assembly is installed inside the cone. A distribution cylinder is slidably connected to the wall of the sleeve, and water distribution holes are arrayed at the bottom of the distribution cylinder. A rotating plate is slidably installed outside the cone. This application achieves that during wastewater transportation, the wastewater and reagents are pre-mixed in the distribution cylinder through the inlet pipe and sleeve. The mixture is then evenly distributed to the top of the cone through the arrayed water distribution holes at its bottom, achieving a multi-point, three-dimensional initial thin-layer flow, increasing the initial contact area of ​​the reaction, and improving the degree of mixing homogenization.

Description

Technical Field

[0001] This application relates to the field of water pollution control and treatment technology, and in particular to a heavy metal selective treatment device and method for ammonia leaching wastewater from molybdenum concentrate. Background Technology

[0002] Ammonia leaching wastewater from molybdenum concentrate is a typical wastewater from the molybdenum smelting process. It is characterized by its alkalinity, high content of ammonia nitrogen and various heavy metal ions (such as copper and lead), and the presence of valuable molybdenum to be recovered. Currently, the treatment of heavy metals in this type of wastewater often employs chemical precipitation methods (such as sulfide precipitation), striving to achieve selective precipitation. This means effectively removing impurities such as copper and lead while minimizing the co-precipitation loss of molybdenum, thereby improving the overall resource recovery rate.

[0003] Existing treatment processes often involve adding precipitants to equalization tanks or reaction tanks and mixing them by mechanical stirring. However, tank-type stirring has limited mixing efficiency and can easily lead to insufficient contact between the reagents and reactants, affecting the long-term stable operation and treatment effect of the equipment. In addition, the entire system relies on external electricity to drive the stirring, resulting in high energy consumption. Summary of the Invention

[0004] To address the limited mixing efficiency of pool-type stirring systems, this application provides a heavy metal selective treatment device and method for ammonia leaching wastewater from molybdenum concentrate.

[0005] The heavy metal selective treatment equipment and method for ammonia leaching wastewater from molybdenum concentrate provided in this application adopts the following technical solution:

[0006] A heavy metal selective treatment device for ammonia leaching wastewater from molybdenum concentrate includes a treatment tank and an inlet pipe and an outlet pipe fixedly connected to the treatment tank. The bottom end of the inlet pipe is coaxially fitted with a sleeve. A dosing component is installed inside the treatment tank, which is used to add reagents according to the proportion of wastewater flow. A cone is fixedly connected inside the treatment tank. The cone is coaxially arranged below the outlet of the sleeve. An auxiliary component is installed inside the cone. The auxiliary component includes a connecting shaft that passes through the inside of the cone. An impeller is fixedly connected to the bottom of the connecting shaft. The impeller is located on the wastewater falling path and rotates due to the impact of the wastewater. A diversion cylinder that can move up and down is slidably connected to the sleeve wall. The diversion cylinder is used to receive wastewater and chemicals. Water distribution holes are arrayed at the bottom of the diversion cylinder. A rotating plate is slidably arranged outside the cone. The rotating plate is arrayed along the arc of the surface of the cone.

[0007] Preferably, the dosing assembly includes a flow sensor installed on the wastewater inlet pipe, a conveying pipe fixedly connected inside the sleeve, the conveying pipe penetrating the interior of the treatment tank, and a plunger pump installed at the end of the conveying pipe away from the sleeve.

[0008] Preferably, the impeller is disposed inside the outlet pipe, a connecting column is slidably connected inside the connecting shaft, a reciprocating screw is fixedly disposed on the connecting shaft, the reciprocating screw is fixedly connected to the connecting column, an array of protrusions is fixedly connected to the bottom of the wastewater inlet pipe and the sleeve, a limit plate is fixedly connected to the sleeve, a limit block is slidably connected inside the limit plate, the bottom of the limit block is fixedly connected to the diverter cylinder, and the impeller achieves efficient rotation through the flow guiding structure.

[0009] Preferably, the flow guiding structure includes a flow guiding block fixedly connected to the inner wall of the treatment tank, and the treatment tank has flow guiding holes.

[0010] Preferably, the projection of the protrusion in the vertical direction is located on the movement path of the water distribution hole.

[0011] Preferably, each of the rotating plates has an array of holes, and the holes of each rotating plate are staggered. The rotating plates are fixedly connected to the connecting shaft and rotate with it.

[0012] Preferably, both the wastewater inlet pipe and the bottom end of the sleeve are chamfered to form a cutting edge.

[0013] Preferably, the shape of the rotating plate is adapted to the curvature of the cone surface, so that the outer edge of the rotating plate maintains a constant or small gap with the cone surface when rotating, and the bottom end of the rotating plate extends along the vertical direction of the cone.

[0014] Preferably, the top of the connecting column is fixed to the bottom of the diverter cylinder.

[0015] A method for selectively treating heavy metals in ammonia leaching wastewater from molybdenum concentrate, using the aforementioned selective heavy metal treatment equipment for ammonia leaching wastewater from molybdenum concentrate, comprising: S1. Ammonia leaching wastewater containing heavy metals is transported through the wastewater inlet pipe, and its flow rate is monitored in real time by a flow sensor. The control unit controls the operation of the plunger pump in real time based on the monitored flow signal, and pumps the selective heavy metal treatment agent out through the annular channel between the sleeve and the outlet end of the wastewater inlet pipe, so that it is initially mixed with the wastewater flowing out from the center above the distribution cylinder.

[0016] S2. The initially mixed liquid is evenly distributed to the cone apex area of ​​the lower cone through the array of water distribution holes at the bottom of the distributor cylinder.

[0017] S3. The downward flow of liquid impacts and drives the impeller to rotate, which in turn drives the connecting shaft and the rotating plate fixed on it to rotate. As the liquid flows downward along the surface of the cone, it is repeatedly sheared and mixed by the rotating rotating plate with staggered holes. The rotation of the connecting shaft synchronously drives the reciprocating screw, which drives the distributor cylinder to make periodic vertical reciprocating motion.

[0018] S4. The reacted mixture is discharged from the outlet pipe and enters the sedimentation tank.

[0019] In summary, this application includes the following beneficial technical effects: 1. In use, the present invention achieves direct mixing of wastewater during transportation by using a cone, auxiliary components, a diversion cylinder, and a rotating plate. After being transported to the sedimentation tank, no agitator is required, thus avoiding the situation of limited mixing efficiency. The wastewater and the agent are premixed in the diversion cylinder by the wastewater inlet pipe and the sleeve. The wastewater and the agent are then evenly and discretely distributed to the top of the cone through the water distribution holes arrayed at the bottom of the cylinder, achieving a multi-point source, three-dimensional distribution of the initial thin laminar flow. Compared with single-point water distribution, this further increases the initial contact area of ​​the reaction, thereby improving the degree of homogenization of the mixture.

[0020] 2. In use, the present invention uses an upright cone as the core reaction surface and utilizes the potential energy of the wastewater discharge to drive the impeller to rotate, which in turn drives the rotating plates arranged in an arc array along the cone surface to rotate. During rotation, the staggered holes on the rotating plates continuously shear, cut, and three-dimensionally reassemble the wastewater and reagent mixture film flowing down the cone surface, increasing the contact area and mass transfer rate of the two phases, creating a highly turbulent and uniform reaction environment. This allows selective precipitation or reaction to proceed more fully and quickly in a shorter process, thereby significantly improving the removal efficiency and completeness of the target heavy metal ions. Furthermore, the rotating plates can continuously clean the cone surface through physical scraping and hydraulic disturbance, preventing heavy metal precipitates from forming scale and ensuring consistent thin-layer mass transfer efficiency.

[0021] 3. When the present invention is used, the wastewater drive connecting shaft rotates, which synchronously drives the reciprocating screw on it to move, forcing the diverter cylinder and connecting column to make periodic reciprocating motion under vertical guidance. This reciprocating motion, combined with the chamfered cutting edge of the sleeve and the bottom of the wastewater inlet pipe, can continuously scrape the bottom of the diverter cylinder and the area around the water distribution hole. In particular, the protrusions set at the outlet end of the wastewater inlet pipe and the bottom end of the sleeve can be directly inserted into the corresponding water distribution hole when the diverter cylinder moves, realizing a dual online mechanical cleaning action of scraping and plucking, which can effectively peel off, break and push out early deposits or crystals that may form in the diverter hole.

[0022] 4. When using this invention, by integrating a flow sensor and control unit in the wastewater inlet pipe, a plunger pump is driven to add the reagent, establishing a precise dosing mechanism linked to the flow rate. This ensures that the reagent dosage is matched proportionally with the wastewater flow rate in real time, reducing reagent waste and providing stable and controllable chemical conditions for the subsequent selective precipitation reaction, which is a prerequisite for achieving efficient selective removal. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this application; Figure 2 This is a side view of the overall structure of this application; Figure 3 This is a schematic diagram of the internal structure of the processing tank in this application; Figure 4 This is a top view of the internal structure of the processing tank in this application; Figure 5 This is a schematic diagram of the auxiliary component structure of this application; Figure 6 for Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 This is a schematic diagram of the internal structure of the cone in this application; Figure 8 for Figure 7 Enlarged structural diagram at point B; Figure 9 This is a partial structural diagram of the auxiliary components of this application.

[0024] Attached reference numerals: 1. Treatment tank; 2. Wastewater inlet pipe; 3. Dosing components; 31. Flow sensor; 32. Delivery pipe; 33. Plunger pump; 4. Sleeve; 5. Cone; 6. Auxiliary components; 61. Connecting shaft; 62. Impeller; 63. Connecting column; 64. Reciprocating lead screw; 65. Protrusion; 66. Limiting plate; 67. Limiting block; 68. Flow guide block; 69. Flow guide hole; 7. Diverter cylinder; 71. Water distribution hole; 8. Rotating plate; 81. Hole; 9. Water outlet pipe. Detailed Implementation

[0025] The following is in conjunction with the appendix Figures 1-9 This application will be described in further detail.

[0026] This application discloses a heavy metal selective treatment device and method for ammonia leaching wastewater from molybdenum concentrate.

[0027] Example 1 Reference Figures 1 to 7A selective heavy metal treatment device for ammonia leaching wastewater from molybdenum concentrate includes a treatment tank 1 and an inlet pipe 2 and an outlet pipe 9 fixedly connected to the treatment tank 1. The inlet pipe 2 is used to transport wastewater and is located at the top of the treatment tank 1. The outlet pipe 9 is used to discharge a mixture of wastewater and chemical solution. The outlet pipe 9 is inclined to increase the flow rate of the mixture and reduce bends and blockages. The outlet pipe 9 is located at the bottom of the treatment tank 1, and its top end is fixed to the middle of the inner wall of the treatment tank 1. The wastewater inlet pipe 2 and the outlet pipe 9 constitute the core container and basic flow path of the equipment, realizing the introduction, treatment and export of wastewater. The bottom end of the wastewater inlet pipe 2 is coaxially fitted with a sleeve 4 to form an annular reagent channel, which is a pipe structure that realizes the instantaneous preliminary mixing of reagent and wastewater. The treatment tank 1 is equipped with a dosing component 3, which is used to add reagents according to the proportion of wastewater flow. The reagent is one or a combination of sulfide precipitant and organic complexing agent, which is used to selectively precipitate or complex copper, lead and zinc heavy metal ions in the ammonia leaching wastewater of molybdenum concentrate. A cone 5 is fixedly connected inside the treatment tank 1. The central axis of the cone 5 extends and is fixed to the middle of the inner wall of the treatment tank 1. The cone 5 is a right circular cone with the tip pointing upwards. The cone 5 is coaxially arranged below the outlet of the sleeve 4. The cone 5 serves as the core reaction surface, providing an extended and controllable flow path for wastewater and reagents. An auxiliary component 6 is installed inside the cone 5. The auxiliary component 6 includes a connecting shaft 61 that passes through the inside of the cone 5. The connecting shaft 61 is rotatably connected to the cone 5 and is coaxially arranged with the cone 5. An impeller 62 is fixedly connected to the bottom of the connecting shaft 61. The impeller 62 is located on the wastewater falling path and converts the potential energy and kinetic energy of the wastewater into the mechanical rotational power required to drive the entire system. This is similar in principle to micro water turbine power generation technology. A diversion cylinder 7 is slidably connected to the sleeve 4. The diversion cylinder 7 can move up and down. The diversion cylinder 7 is used to receive wastewater and reagents and distribute the mixture evenly to the top of the cone 5. Eight water distribution holes 71 are opened at the bottom of the diversion cylinder 7. The eight water distribution holes 71 are arranged in a circular array around the center of the cone 5. Eight rotating plates 8 are slidably arranged on the outside of the cone 5. The eight rotating plates 8 are arranged in a circumferential array along the surface arc of the cone 5. The eight rotating plates 8 rotate on the surface of the cone 5 to mechanically shear and reorganize the liquid film, which greatly enhances the mixing and mass transfer process. The auxiliary component 6 is built into the treatment tank 1. It is the energy conversion and transmission hub that uses the flow power of wastewater to drive the rotating plates 8 for mixing and the self-cleaning of the diverter cylinder 7. The bottom ends of the wastewater inlet pipe 2 and the sleeve 4 are both provided with chamfers to form cutting edges. The shape of the rotating plate 8 is adapted to the curvature of the cone surface of the cone 5, so that the outer edge of the rotating plate 8 maintains a constant or small gap with the cone surface when rotating. The bottom end of the rotating plate 8 extends along the vertical direction of the cone 5 to shear the wastewater splashed from the water distribution hole 71.

[0028] Wastewater enters treatment tank 1 through wastewater inlet pipe 2. At the same time, the dosing component 3 adds chemicals according to the flow rate. After the chemicals are initially mixed with the wastewater through sleeve 4, they fall together into the vertically movable distribution cylinder 7. The mixture of wastewater and chemicals is evenly sprayed onto the surface of the cone 5 below through the water distribution hole 71 at the bottom of the distribution cylinder 7. The mixture flowing down the cone drives the auxiliary component 6 to work and is dynamically sheared and mixed by the rotating plate 8 on the surface of the cone 5. Finally, the treated wastewater is discharged from the outlet pipe 9. The main body of treatment tank 1 is made of corrosion-resistant 316L stainless steel. The cone angle of the cone 5 can be designed to be 60 degrees. The surface is electrolytically polished (roughness Ra<0.4μm) to reduce wall adhesion.

[0029] Reference Figures 1 to 3 The dosing component 3 includes a flow sensor 31 installed on the wastewater inlet pipe 2, which provides real-time flow data. A delivery pipe 32 is fixedly connected inside the sleeve 4. The delivery pipe 32 passes through the interior of the treatment tank 1 and is fixedly installed with the treatment tank 1. A plunger pump 33 is provided at the end of the delivery pipe 32 away from the sleeve 4. The plunger pump 33 is used to receive control signals and output reagents. It is the key power component for realizing proportional dosing. The three components work together to form a complete closed-loop automatic proportional dosing system.

[0030] The flow sensor 31 monitors the wastewater flow rate in the wastewater inlet pipe 2 in real time and transmits the signal to the control unit. The control unit drives the plunger pump 33 to work according to the preset algorithm. The plunger pump 33 accurately pumps the agent into the sleeve 4 through the delivery pipe 32.

[0031] Reference Figures 3 to 9 Impeller 62 is located at the top of the inside of water outlet pipe 9. The size of impeller 62 is adapted to the top size of water outlet pipe 9. Connecting column 63 is slidably connected through the top of connecting shaft 61. Reciprocating screw 64 is fixedly installed at the bottom of the inner wall of connecting shaft 61. Reciprocating screw 64 consists of screw and nut. The shaft surface of screw has two spiral grooves with opposite directions of rotation (one left-handed and one right-handed) that are smoothly connected at both ends. The nut that matches it has a rotatable crescent-shaped sliding shuttle inside. The bottom of screw is connected to connecting shaft 61. The nut of reciprocating screw 64 is fixedly connected to the bottom of connecting column 63. The top of connecting column 63 is coaxially fixed to the bottom of diverter cylinder 7. Eight protrusions 65 are fixedly connected to the bottom of both the wastewater inlet pipe 2 and the sleeve 4. The eight protrusions 65 are arranged in a circumferential array around the center of the connecting column 63. A limit plate 66 is fixedly connected to the sleeve 4. A limit block 67 is slidably connected inside the limit plate 66. The limit plate 66 and the limit block 67 form a linear guide rail, which restricts the flow divider 7 to move only up and down, ensuring motion accuracy and unblocking effect. The bottom of the limit block 67 is fixedly connected to the outer wall of the flow divider 7. The impeller 62 achieves efficient rotation through a flow guiding structure. The flow guiding structure includes components fixed to the inner wall of the treatment tank 1. Eight guide blocks 68 are fixedly connected, located above the impeller 62 and below the cone 5, and arranged in a circumferential array around the center line of the impeller 62. A guide hole 69 is provided in the middle of the inner wall of the treatment tank 1, extending through the interior of the outlet pipe 9, and located above the impeller 62 blades. This guide hole 69 is used to collect and guide the water flow to impact the impeller 62 more efficiently, ensuring energy capture efficiency. This component realizes the conversion and distribution of wastewater kinetic energy to hybrid and clean power without additional energy consumption.

[0032] Wastewater flowing down from the surface of cone 5 converges and impacts impeller 62, causing it to rotate. Impeller 62 drives connecting shaft 61 to rotate. Connecting shaft 61 rotates inside cone 5. Connecting shaft 61 drives rotating plate 8 fixed on it to rotate for mixing, and also drives reciprocating screw 64 on it to rotate. The rotation of reciprocating screw 64 causes connecting column 63 to perform linear reciprocating motion. Connecting column 63 drives the diverter cylinder 7 fixed to it to move up and down along the vertical guide rail composed of limiting plate 66 and limiting block 67. The guide block 68 and guide hole 69 optimize the flow pattern of water rushing towards impeller 62 and improve energy conversion efficiency. The projection of protrusion 65 in the vertical direction is located on the movement path of water distribution hole 71. When diverter cylinder 7 rises, protrusion 65 fixed to the bottom of wastewater inlet pipe 2 and sleeve 4 can be inserted into its water distribution hole 71.

[0033] Reference Figures 3 to 9 When the diverter 7 moves, the protrusion 65 can pass through the corresponding water distribution hole 71. Combined with the chamfering and scraping prevention function of the wastewater inlet pipe 2 and the sleeve 4, it forms a dual guarantee of prevention and unblocking, reducing the risk of blockage of the diverter hole. Each rotating plate 8 has an array of holes 81, and the holes 81 of each rotating plate 8 are staggered. The rotating plate 8 is fixedly connected to the connecting shaft 61 and rotates with it. The staggered arrangement of the holes 81 avoids the fluid from passing directly through, forcing the liquid flow to be dispersed and reorganized between the plates, and preventing the heavy metal deposits on the surface of the cone 5 at the hole 81 from forming scale.

[0034] Driven by the auxiliary component 6, the rotating plate 8 rotates on the surface of the cone 5, and the intersecting holes 81 on it continuously cut and penetrate the flowing liquid film. At the same time, the diverter 7 moves up and down periodically, and its water distribution holes 71 are periodically cleaned by the protrusions 65.

[0035] Example 2 A method for selectively treating heavy metals in ammonia leaching wastewater from molybdenum concentrate, using the aforementioned selective heavy metal treatment equipment for ammonia leaching wastewater from molybdenum concentrate, comprising: S1. Ammonia leaching wastewater containing heavy metals is first transported to the treatment equipment through wastewater inlet pipe 2. During the transportation process, flow sensor 31 installed on wastewater inlet pipe 2 monitors the instantaneous flow rate of the wastewater in real time and continuously, and transmits the collected flow signal to the control unit of the equipment. The control unit has a preset model (such as a function curve or algorithm program) that accurately corresponds to the flow rate and the dosage of the reagent. Based on the received real-time flow signal, it dynamically calculates the required dosage of the reagent and immediately generates a corresponding control command to drive the plunger pump 33 at a specific... When the frequency or stroke starts to work, the plunger pump 33 pumps the selective heavy metal treatment agent from the storage tank into the sleeve 4 coaxially sleeved at the outlet end of the wastewater inlet pipe 2 through the delivery pipe 32. The agent then flows out evenly from the annular slit channel formed between the sleeve 4 and the outer wall of the wastewater inlet pipe 2, forming an annular liquid curtain around the central wastewater flow. This design allows the agent to be enveloped by the high-speed downward flow of wastewater and undergo preliminary impact, shearing and mixing the moment it leaves the pipe opening, realizing real-time and precise linkage matching between agent addition, wastewater flow rate and pollutant load.

[0036] S2. The wastewater and reagent mixture, after initial mixing, fall together into the distribution cylinder 7 located directly below it. The bottom of the distribution cylinder 7 has a large number of arrayed water distribution holes 71 densely and evenly distributed. When the mixture flows through these water distribution holes 71, it is dispersed into numerous liquid streams. This design breaks the concentrated liquid flow and evenly distributes the mixture over the entire starting area of ​​the cone 5 below, forming an initial liquid film with a relatively uniform thickness covering the cone apex. The uniform distribution not only makes full use of the entire reaction surface area of ​​the cone 5 and avoids localized uneven reactions caused by central runoff, but also creates ideal initial conditions for subsequent deep mixing reactions.

[0037] S3. Under the influence of gravity, the liquid film distributed at the top of the cone 5 begins to flow downwards along its conical surface. The collected and discharged water flow impacts and drives the impeller 62, which is set on the outlet path, to rotate. The rotation of the impeller 62, through the connecting shaft 61 fixed coaxially with it, converts the gravitational potential energy and kinetic energy of the wastewater into the mechanical energy of the system. This mechanical energy drives the two core functions to operate simultaneously. The connecting shaft 61 drives multiple rotating plates 8 fixed on it to rotate together. As the liquid flows downwards along the surface of the cone 5, the rotating rotating plates 81 with staggered holes 81 are affected. Repeated shearing and mixing ensure full contact and reaction between the reagent and heavy metal ions. Simultaneously, the rotation of the connecting shaft 61 synchronously drives the reciprocating screw 64, causing the diverter 7 to perform periodic vertical reciprocating motion. During the motion, the bottom of the diverter 7 continuously scrapes against the chamfered edges of the sleeve 4 and the bottom of the wastewater inlet pipe 2, removing adhering substances. At the same time, the protrusion 65 set at the bottom of the pipe opening can be inserted into the corresponding water distribution hole 71 to mechanically push out any crystals or deposits that may form, thereby preventing the diverter hole from clogging online and automatically, ensuring smooth flow.

[0038] S4. After sufficient reaction on the surface of cone 5, the wastewater enters the outlet pipe 9 and is discharged. Subsequently, the mixture is introduced into the subsequent solid-liquid separation unit, such as a sedimentation tank, a thickening tank, or a filtration device. In this unit, the suspended solids (i.e. the removed heavy metals) are settled or separated, and the supernatant (compliant wastewater) can be further treated or discharged, thereby achieving selective removal and resource recovery of heavy metals.

[0039] The flow sensor 31 and the plunger pump 33 are existing technologies, and their structural principles will not be described in detail. The linkage control between the flow sensor 31 and the plunger pump 33 is achieved through an electronic control system with a microcontroller or programmable logic controller as its core. Specifically, the flow sensor 31 monitors the pipeline flow in real time and outputs the corresponding analog current signal or digital pulse signal to the control unit. The control unit samples, filters, and calibrates the input signal, converts it into an instantaneous flow value, and calculates the required real-time dosage of the agent based on a preset mathematical model of flow and dosage. Then, it generates the corresponding pulse frequency and width modulation signal, and precisely controls the starting, running frequency, and stroke of the plunger pump 33 motor through the drive circuit, thereby completing the fully closed-loop automatic control from flow detection to proportional dosing.

[0040] The implementation principle of the heavy metal selective treatment device for ammonia leaching wastewater of molybdenum concentrate in this embodiment is as follows: wastewater enters the treatment tank 1 through the wastewater inlet pipe 2, and at the same time, the dosing component 3 adds reagents according to the flow rate. After the reagents are initially mixed with the wastewater through the sleeve 4, they fall into the vertically movable diversion cylinder 7. The mixture of wastewater and reagents is evenly sprayed onto the surface of the cone 5 below through the water distribution hole 71 at the bottom of the diversion cylinder 7. The mixture flowing down the cone surface drives the auxiliary component 6 to work and is dynamically sheared and mixed by the rotating plate 8 on the surface of the cone 5. Finally, the treated wastewater is discharged from the outlet pipe 9.

[0041] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heavy metal selective treatment device for ammonia leaching wastewater from molybdenum concentrate, characterized in that: It includes a treatment tank (1) and an inlet pipe (2) and an outlet pipe (9) fixedly connected to the treatment tank (1). The bottom end of the inlet pipe (2) is coaxially fitted with a sleeve (4). The treatment tank (1) is equipped with a dosing component (3), which is used to add chemicals according to the proportion of wastewater flow. A cone (5) is fixedly connected inside the treatment tank (1). The cone (5) is coaxially arranged below the outlet of the sleeve (4). An auxiliary component (6) is provided inside the cone (5). The auxiliary component (6) includes a connecting shaft (61) that passes through the inside of the cone (5). An impeller (62) is fixedly connected to the bottom of the connecting shaft (61). The impeller (62) is located on the wastewater falling path and rotates by the impact of the wastewater. The sleeve (4) has a sliding connection to a diversion cylinder (7) that can move up and down. The diversion cylinder (7) is used to receive wastewater and chemicals. The bottom of the diversion cylinder (7) is arrayed with water distribution holes (71). A rotating plate (8) is slidably arranged outside the cone (5). The rotating plate (8) is arrayed along the surface arc of the cone (5).

2. The heavy metal selective treatment equipment for ammonia leaching wastewater from molybdenum concentrate according to claim 1, characterized in that: The dosing component (3) includes a flow sensor (31) installed on the wastewater inlet pipe (2), and a conveying pipe (32) is fixedly connected inside the sleeve (4). The conveying pipe (32) passes through the interior of the treatment tank (1), and a plunger pump (33) is provided at the end of the conveying pipe (32) away from the sleeve (4).

3. The heavy metal selective treatment equipment for ammonia leaching wastewater from molybdenum concentrate according to claim 1, characterized in that: The impeller (62) is located inside the outlet pipe (9). A connecting column (63) is slidably connected inside the connecting shaft (61). A reciprocating screw (64) is fixedly installed on the connecting shaft (61). The reciprocating screw (64) is fixedly connected to the connecting column (63). An array of protrusions (65) is fixedly connected to the bottom of the wastewater inlet pipe (2) and the sleeve (4). A limiting plate (66) is fixedly connected on the sleeve (4). A limiting block (67) is slidably connected inside the limiting plate (66). The bottom of the limiting block (67) is fixedly connected to the diverter cylinder (7). The impeller (62) rotates through the flow guiding structure.

4. The heavy metal selective treatment equipment for ammonia leaching wastewater from molybdenum concentrate according to claim 3, characterized in that: The flow guiding structure includes a flow guiding block (68) fixedly connected to the inner wall of the treatment tank (1), and the treatment tank (1) is provided with a flow guiding hole (69).

5. The heavy metal selective treatment equipment for ammonia leaching wastewater from molybdenum concentrate according to claim 3, characterized in that: The projection of the protrusion (65) in the vertical direction is located on the movement path of the water distribution hole (71).

6. The heavy metal selective treatment equipment for ammonia leaching wastewater from molybdenum concentrate according to claim 1, characterized in that: The rotating plate (8) is provided with holes (81) arranged in an array, and the holes (81) of each rotating plate (8) are staggered. The rotating plate (8) is fixedly connected to the connecting shaft (61) and rotates with it.

7. The heavy metal selective treatment equipment for ammonia leaching wastewater from molybdenum concentrate according to claim 2, characterized in that: Both the wastewater inlet pipe (2) and the sleeve (4) have chamfered ends to form cutting edges.

8. The heavy metal selective treatment equipment for ammonia leaching wastewater from molybdenum concentrate according to claim 6, characterized in that: The shape of the rotating plate (8) is adapted to the curvature of the cone surface of the cone (5), so that the outer edge of the rotating plate (8) maintains a constant or small gap with the cone surface when rotating, and the bottom end of the rotating plate (8) extends along the vertical direction of the cone (5).

9. The heavy metal selective treatment equipment for ammonia leaching wastewater from molybdenum concentrate according to claim 3, characterized in that: The top of the connecting column (63) is fixed to the bottom of the diverter (7).

10. A method for selectively treating heavy metals in ammonia leaching wastewater from molybdenum concentrate, used in the heavy metal selective treatment equipment for ammonia leaching wastewater from molybdenum concentrate as described in any one of claims 1-9, characterized in that: include: S1. Ammonia leaching wastewater containing heavy metals is transported through the wastewater inlet pipe (2) and its flow rate is monitored in real time by the flow sensor (31). The control unit controls the operation of the plunger pump (33) in real time according to the monitored flow signal, and pumps the selective heavy metal treatment agent out through the annular channel between the sleeve (4) and the outlet end of the wastewater inlet pipe (2), so that it is initially mixed with the wastewater flowing out from the center above the diversion cylinder (7). S2. The initially mixed liquid flows through the array of water distribution holes (71) at the bottom of the distributor (7) and is evenly distributed to the cone top area of ​​the lower cone (5). S3. The downward flow of liquid impacts and drives the impeller (62) to rotate, which in turn drives the connecting shaft (61) and the rotating plate (8) fixed on it to rotate. As the liquid flows downward along the surface of the cone (5), it is repeatedly sheared and mixed by the rotating plate (8) with staggered holes (81). The rotation of the connecting shaft (61) synchronously drives the reciprocating screw (64), which drives the diverter (7) to make periodic vertical reciprocating motion. S4. The mixture after the reaction is discharged from the outlet pipe (9) and enters the sedimentation tank.

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