Integrated reaction device and method for recovering nano-iron from precious metal

Abstract

The invention relates to the technical field of sewage precious metal recovery, and discloses an integrated precious metal recovery nano-iron reaction device and method. The feeding assembly is used for introducing sewage and nano-iron suspension liquid into the horizontal reaction tank; the filter pipe is located in the horizontal reaction tank and is arranged in parallel along the axis of the horizontal reaction tank, and an opening higher than the liquid level of the horizontal reaction tank is formed in the top of the filter pipe; the shifting assembly comprises a power part and a shifting paddle driven by the power part, and the shifting paddle shifts along the inner wall of the horizontal reaction tank and shifts the mixed liquid in the horizontal reaction tank to the position above the opening; the discharging assembly comprises a liquid discharging pipe communicated with the bottom of the horizontal reaction tank and a solid discharging pipe communicated with the filtering pipe. The problems that in existing precious metal recovery, due to the fact that two independent devices are adopted, the number of the devices is large, and the system integration degree is low are solved, and the device has the advantages of being high in recovery rate, low in operation cost and easy to maintain.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage precious metal recovery, and particularly relates to an integrated precious metal recovery nano-iron reaction device and method. BACKGROUND

[0002] With the rapid development of electronic, electroplating, mining and other industries, a large amount of industrial wastewater containing gold, silver, platinum and other precious metal ions is discharged. These precious metals have very high economic value, and if they are directly discharged, not only will it cause resource waste, but also will pose a potential risk to the environment. Therefore, recovering precious metals from wastewater has both environmental and economic benefits.

[0003] At present, an advanced and efficient method for recovering precious metals from wastewater is to use nano zero-valent iron for reduction adsorption. Nano-iron can quickly reduce the precious metal ions in the wastewater to elemental state due to its large specific surface area and high reactivity, and can make the precious metal ions adhere to the surface of the nano-iron particles or form a co-precipitate with them, thereby converting the dissolved state of the precious metal ions into solid particles and realizing separation from the wastewater.

[0004] In the existing treatment process, the reaction equipment commonly used is an independent reaction tank. The typical process flow is as follows: the wastewater containing precious metal ions is pumped into the reaction tank, nano-iron is added and stirred to make it fully react. After the reaction is completed, the mixed liquid containing solid products needs to be transferred to a separate solid-liquid separation unit, such as a filter press, centrifuge or precision filter, for filtration and separation. The separated solid particles are collected for subsequent precious metal refining and recovery, and the treated clear water is discharged or reused.

[0005] However, since the reaction and filtration are completed in two separate devices, the number of devices required for the entire recovery system increases, and the process flow is lengthy. Moreover, the independent reaction tank and filtration equipment need to occupy space separately, which increases the difficulty and space cost of layout for factories or treatment sites with limited space. In addition, the transfer of the mixed liquid after the reaction from the reaction tank to the filtration equipment requires additional power consumption and conveying pumps and other equipment, and the transfer process of the material increases the maintenance workload and potential leakage risk of the pipes and valves. The independent operation and maintenance of the two sets of equipment also increase the overall labor cost and management cost. At the same time, the separation of the reaction and separation processes may cause the entire treatment cycle to be prolonged, which cannot realize rapid and continuous batch processing, affecting the overall efficiency.

[0006] Therefore, using two separate devices to complete the reaction and filtration has the problems of a large number of devices, low system integration, large space occupation, high operating cost and bottlenecks in processing efficiency. Based on this, the present application provides an integrated precious metal recovery nano-iron reaction device. SUMMARY

[0007] One of the purposes of the present application is to provide an integrated noble metal recovery nanometer iron reaction device to solve the problem of too many devices and low system integration caused by using two independent devices in the existing noble metal recovery, so as to be suitable for noble metal recovery in the fields of electroplating, electronic waste liquid, etc., and has the advantages of high recovery rate, low operation cost and easy maintenance; the second purpose is to provide a noble metal recovery nanometer iron reaction method.

[0008] In order to achieve the above-mentioned purposes, the technical scheme adopted by the present application is as follows: The integrated noble metal recovery nanometer iron reaction device comprises: A horizontal reaction tank; A feeding assembly for feeding sewage and nanometer iron suspension into the horizontal reaction tank; A filter pipe located inside the horizontal reaction tank and arranged in parallel along the axis of the horizontal reaction tank, the top of the filter pipe being provided with an opening higher than the liquid level of the horizontal reaction tank; A stirring assembly comprising a power element and a stirring paddle driven by the power element, the stirring paddle stirring along the inner wall of the horizontal reaction tank and stirring the mixed liquid in the horizontal reaction tank to above the opening; A discharging assembly comprising a liquid discharging pipe communicating with the bottom of the horizontal reaction tank and a solid discharging pipe communicating with the filter pipe.

[0009] Further, a stirring assembly is further provided in the horizontal reaction tank, the stirring assembly comprising a stirring main shaft driven by the power element and a stirring paddle provided on the stirring main shaft.

[0010] Further, a planetary gear transmission pair is provided between the power element and the stirring paddle and the stirring main shaft, the stirring main shaft being driven by the sun gear of the planetary gear transmission pair, and the stirring paddle being driven by the gear ring in the planetary gear transmission pair.

[0011] Further, one end of the horizontal reaction tank is provided with a driving disc, a partition plate is sealingly provided between the horizontal reaction tank and the driving disc, the end of the gear ring is provided with a rotating ring sealingly connected along the inner wall of the driving disc, and the rotating ring penetrates through the partition plate and is connected with the stirring paddle.

[0012] Further, a conversion mechanism is further provided between the sun gear and the stirring main shaft, the conversion mechanism comprising a first crank coaxially connected with the sun gear, a second crank connected with the stirring main shaft, and a sliding frame slidingly connected with the side wall of the horizontal reaction tank; A limiting groove is provided on the sliding frame, and the end of the first crank and the second crank is provided with a sliding block slidingly connected in the limiting groove, and the length of the first crank is less than the length of the second crank; The length of the first crank and the length of the second crank satisfy the following relationship: ; In the formula, is the included angle of the stirring paddle stirring in the horizontal reaction tank, is the length of the first crank, is the length of the second crank.

[0013] Further, the feed assembly comprises a sewage feed pipe and a nano-iron suspension feed pipe, and an electric control valve is arranged on each of the feed pipe and the nano-iron suspension feed pipe.

[0014] Further, a feed control mechanism is further arranged, and the feed control mechanism comprises a ratchet wheel rotatably connected to the outer wall of the horizontal reaction tank, a ratchet pawl arranged on the sliding frame, and a fixed sleeve fixedly connected to the outer wall of the horizontal reaction tank. Two electric connection pieces are arranged on the side wall of the fixed sleeve, and a conductive strip electrically conductive with the electric connection pieces is arranged on the side wall of the ratchet wheel. When the conductive strip is electrically conductive with the two electric connection pieces, the electric control valve on the nano-iron suspension feed pipe is powered on and opened.

[0015] Further, a spiral roller is coaxially connected to the planetary gear in the planetary gear transmission pair, and the spiral roller extends into the filter pipe and is rotatably connected to the inner wall of the filter pipe.

[0016] Further, the cross section of the stirring paddle is L-shaped, and when the stirring paddle is rotated to above the opening, one end of the stirring paddle is inclined towards the opening.

[0017] The beneficial effects of the present application are: 1. In the traditional static filtration, solid particles can quickly form a dense filter cake layer on the surface of the filter membrane, which seriously hinders the filtration rate and causes frequent shutdown for cleaning. However, the present application drives the stirring paddle to continuously rotate through the power element in the stirring assembly, repeatedly stirs the mixed liquid at the bottom of the horizontal reaction tank into the filter pipe, and the liquid penetrates the filter pipe under the action of gravity, while the nano-iron attached with noble metal and its reaction products are intercepted in the filter pipe. The solid-liquid separation process is dynamic and intermittent, and the filter cake is not easy to form a dense layer on the surface of the filter medium, effectively solving the plugging problem of traditional static filtration. At the same time, the stirred liquid forms a cycle in the tank, continuously mixing the treated and untreated liquid, ensuring the uniformity of the reaction concentration.

[0018] 2、The application converts the rotary motion of the first crank into the linear reciprocating motion of the sliding frame through the cooperation of the first crank, the second crank and the sliding frame in the conversion mechanism, and converts it again into the reciprocating swing of the second crank, that is, converts the rotary motion of the first crank into the reciprocating swing of the second crank at a specific angle, avoids useless motion of the stirring paddle, and the fluid shear force and direction change generated by the reciprocating swing are more conducive to breaking the concentration boundary layer than uniform rotation, so that the nano iron and noble metal ions can be fully contacted.

[0019] 3、The application adopts a power member to drive a planetary gear transmission pair, the gear ring in the planetary gear pair drives the stirring paddle to rotate, providing power for the solid-liquid separation of the mixed liquid; the planetary gear pair drives the spiral roller to rotate, actively conveying the solid product in the filter pipe outward to realize continuous discharge; the sun gear in the planetary gear pair drives the stirring paddle to swing reciprocatingly through a conversion mechanism, realizing the intensive mixing of the mixed liquid to strengthen the reaction effect. Through pure mechanical linkage, the functions are highly integrated and synchronized, ensuring that the reaction, separation, slag discharge and material supplementing are in consistent rhythm, stable and reliable in operation, significantly reducing energy consumption, driving the stirring assembly to reciprocate, the spiral roller to rotate and the stirring assembly to rotate, simplifying the transmission structure, reducing the manufacturing cost and failure rate, and ensuring the synchronization between the actions.

[0020] 4、The application cooperates the motion process of the conversion mechanism with the feeding control mechanism to automatically control the addition of nano iron, realize precise dosing process, and only when the ratchet runs to a specific position, the electric control valve on the nano iron suspension feeding pipe is opened. Small-dose, multi-batch automatic supplementing is realized, the optimal concentration of nano iron in the reaction system can be dynamically maintained according to the reaction progress, the invalid loss caused by the initial high concentration is avoided, the selectivity and utilization rate of noble metals are improved, and the operation cost is reduced. Moreover, after the nano iron suspension enters the horizontal mixing tank, it is stirred by the stirring paddle, ensuring that the newly added medicament can be immediately dispersed, avoiding agglomeration and inactivation due to local high concentration.

[0021] 5、Through a series of ingenious mechanical design and system integration, the application can achieve the functions of nano iron and noble metal reaction, stirring, mixed liquid filtration and timed feeding, successfully solving the efficiency, cost and automation problems existing in the process of recovering noble metals from nano iron, and is suitable for noble metal recovery in the fields of electroplating and electronic waste liquid, and has the advantages of high recovery rate, low operation cost and easy maintenance.

[0022] Based on the same inventive concept, the application provides a noble metal recovery nano iron reaction method, which comprises reacting and recovering the noble metal in sewage by using the integrated noble metal recovery nano iron reaction device. Step S1, equipment initialization; Step S2, sewage and reaction solvent addition: sewage and nano-iron suspension are introduced into the horizontal reaction tank through the feeding assembly; Step S3, mixing reaction and solid-liquid separation: the stirring assembly is driven by the power component, and the mixed liquid is stirred into the filter pipe to perform solid-liquid separation; Step S4, reaction solvent supplement: the feeding assembly is controlled to be periodically opened and closed to introduce the nano-iron suspension into the horizontal reaction tank in a segmented manner; Step S5, material separation: the noble metal such as gold and silver adsorbed by the nano-iron is discharged through the solid discharge pipe, and the sewage after reaction is discharged through the liquid discharge pipe.

[0023] According to the method, the reaction and recovery treatment of the noble metal in the sewage can effectively solve the problems of efficiency, cost and automation in the process of recovering the noble metal by using nano-iron, and is suitable for the recovery of noble metal in the fields of electroplating and electronic waste liquid, and has the advantages of high recovery rate, low operation cost and easy maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is one side view of the integrated noble metal recovery nano-iron reaction device. Figure 2 It is another side view of the integrated noble metal recovery nano-iron reaction device. Figure 3 It is a schematic view of the planetary gear transmission pair connection in the integrated noble metal recovery nano-iron reaction device. Figure 4 It is a sectional view of the internal part of the horizontal reaction tank in the integrated noble metal recovery nano-iron reaction device. Figure 5 It is a schematic view of the conversion mechanism in the integrated noble metal recovery nano-iron reaction device. Figure 6 It is a schematic view of the first crank connection in the conversion mechanism. Figure 7 It is a schematic view of the feeding control mechanism in the integrated noble metal recovery nano-iron reaction device.

[0025] The reference signs in the drawings of the specification include: support frame 1, horizontal reaction tank 2, motor 3, driving disc 4, sewage feeding pipe 5, nano-iron suspension feeding pipe 6, liquid discharge pipe 7, solid discharge pipe 8, sun gear 9, planetary gear 10, gear ring 11, stirring paddle 12, filter pipe 13, spiral roller 14, stirring main shaft 15, stirring paddle 16, ratchet 17, fixed sleeve 18, fixed column 19, rotating ring 20, sliding rail 21, sliding frame 22, connecting rod 23, pawl 24, second crank 25, first crank 26, ratchet shaft 27, conductive strip 28, and electric connection sheet 29. DETAILED DESCRIPTION

[0026] Other advantages and effects of the present application can be easily understood by those skilled in the art from the above description. The present application can also be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details of the present application based on different views and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, but not for limiting the protection scope of the present application.

[0027] It should be noted that the diagrams provided in the following embodiments only schematically illustrate the basic concept of the present application, and only the components related to the present application are shown in the diagrams, but not drawn according to the number, shape and size of the components in actual implementation. The shape, number and proportion of each component in actual implementation can be arbitrarily changed, and the layout pattern of the components can be more complex.

[0028] The integrated noble metal recovery nanometer iron reaction device, for example Figure 1 and Figure 2 As shown, it comprises a horizontal reaction tank 2, a feed assembly provided at the top of the horizontal reaction tank 2, a discharge assembly provided at one end of the horizontal reaction tank 2, and a filter pipe 13 and a stirring assembly provided inside the horizontal reaction tank 2.

[0029] The horizontal reaction tank 2 is installed and fixed on the working ground by a support frame 1, is made of corrosion-resistant materials such as stainless steel or carbon steel lined with plastic, and the length-diameter ratio is preferably 3:1 to 5:1 to ensure that the mixed liquid has sufficient residence time.

[0030] The feed assembly is used to introduce sewage and nanometer iron suspension into the horizontal reaction tank 2, and comprises a sewage feed pipe 5 and a nanometer iron suspension feed pipe 6. The sewage feed pipe 5 and the nanometer iron suspension feed pipe 6 are respectively connected to the horizontal reaction tank 2, and the diameter of the feed pipe is designed according to the treatment capacity, which is usually DN50-DN100. An electric control valve is provided on each of the sewage feed pipe 5 and the nanometer iron suspension feed pipe 6 to control the feeding of sewage and nanometer iron suspension respectively. The discharge assembly comprises a liquid discharge pipe 7 and a solid discharge pipe 8 which are in communication with the horizontal reaction tank 2. The liquid discharge pipe 7 is in communication with the bottom of the horizontal reaction tank 2 and is provided with a control valve. A drainage slope is provided at the bottom of the horizontal reaction tank 2 to facilitate the flow of liquid to the liquid discharge pipe 7.

[0031] As Figure 3 and Figure 4As shown, the filter pipe 13 is used for solid-liquid separation of the mixed liquid in the horizontal reaction tank 2, the filter pipe 13 is arranged along the axis of the horizontal reaction tank 2 in parallel, and the top of the filter pipe 13 is provided with an opening higher than the liquid level of the horizontal reaction tank 2, the inside of the horizontal reaction tank 2 is provided with a liquid level sensor for monitoring the liquid level, ensuring that the opening of the filter pipe 13 is always higher than the liquid level to prevent overflow, and the included angle between the two ends of the opening and the center of the filter pipe 15 is 90° to 180°.

[0032] The pipe wall of the filter pipe 13 is made of porous material, such as sintered metal filter screen, ceramic filter element or high polymer composite material, with a pore size smaller than the particle size of the nano iron particles, which is 0.1-10μm, to ensure effective interception. The end of the filter pipe 13 penetrates through the horizontal reaction tank 2 and communicates with the solid discharge pipe 8, and the filter pipe 13 is designed to be detachably connected and installed, connected with the solid discharge pipe 8 through flange or quick connector, convenient for maintenance and replacement. At the same time, the filter pipe 13 is fixed inside the horizontal reaction tank 2 by support or clamp etc. support inside the horizontal reaction tank 2, to ensure that its axis is parallel to the axis of the reaction tank, and the top of the opening is higher than the normal working liquid level of the horizontal reaction tank 2.

[0033] The stirring assembly is used to stir the mixed liquid in the horizontal reaction tank 2 to the top of the opening, and then perform solid-liquid separation operation, wherein the stirring assembly comprises a power component and a stirring paddle 12 driven by the power component, the stirring paddle 12 stirs along the inner wall of the horizontal reaction tank 2, the cross section of the stirring paddle 12 is L-shaped, and when the stirring paddle 12 rotates to the top of the opening, one end of the stirring paddle 12 is inclined towards the opening.

[0034] In the L-shaped cross section of the stirring paddle 12, the ratio of the long side to the short side is about 2:1, the long side is used to scoop up the bottom mixed liquid, and the short side is used to guide the liquid to be thrown when rotating to the top. To ensure effective throwing, when the stirring paddle 12 rotates to the top of the opening of the filter pipe 13, the included angle between the inclined end of the stirring paddle 12 towards the opening and the horizontal plane is between 30° and 60°, and the rotating speed of the stirring paddle 12 is 5-20rpm, to ensure that the mixed liquid is smoothly scooped up and thrown to the top of the opening of the filter pipe 13. The material of the stirring paddle 12 is polytetrafluoroethylene or other wear-resistant engineering plastics to reduce wear. The gap between the stirring paddle 12 and the horizontal reaction tank 2 is 5-10mm to prevent jamming.

[0035] In the traditional static filtration, solid particles will quickly form a dense filter cake layer on the surface of the filter membrane, which seriously hinders the filtration rate, resulting in frequent shutdown for cleaning. In this embodiment, the paddle 12 is rotated to scoop up the mixed liquid at the bottom of the horizontal reaction tank 2 and throw it over the open top of the filter tube 13. The liquid penetrates the filter tube 13 under the action of gravity, while the nano-iron attached to the noble metal and its reaction products are trapped in the filter tube 13, and the solid-liquid separation process is dynamic and intermittent, and the filter cake is not easy to form a dense layer on the surface of the filter medium, effectively solving the plugging problem of traditional static filtration; at the same time, the stirred liquid forms a circulation in the tank, continuously mixing treated and untreated liquids to ensure uniformity of the reaction concentration.

[0036] The power component in the stirring assembly adopts a motor 3, which drives the paddle 12 to rotate through a reducer and a planetary gear transmission pair. Correspondingly, a drive disc 4 is arranged at one end of the horizontal reaction tank 2, and a partition plate is sealingly arranged between the horizontal reaction tank 2 and the drive disc 4. The partition plate is fixed to the end of the drive disc 4 by a plurality of fixing columns 19. The partition plate between the drive disc 4 and the horizontal reaction tank 2 is a key sealing component. It is made of corrosion-resistant and high-strength materials such as polytetrafluoroethylene or stainless steel lining, and is sealed by mechanical seal or packing box to ensure that the liquid in the reaction tank does not leak.

[0037] The output end of the reducer is connected with the sun gear 9 in the planetary gear transmission pair, the planetary gear 10 in the planetary gear transmission pair rotates in place in the drive disc 4, the gear ring 11 in the planetary gear transmission pair is sealingly connected with the rotating ring 20 rotating along the inner wall of the drive disc 4 at the end, and the rotating ring 20 penetrates the partition plate and is connected with the paddle 12. Thus, the motor 3 drives the rotation of the paddle 12 to stir the mixed liquid into the filter tube 13 for solid-liquid separation.

[0038] The planetary gear 10 in the planetary gear transmission pair is coaxially connected with a spiral roller 14, which extends into the filter tube 13 and is rotatingly connected along the inner wall of the filter tube 13. The spiral roller is a screw structure with a pitch of 50-100 mm. The spiral roller 14 extending into the filter tube 13 operates synchronously with the stirring assembly, which can actively and continuously transport the solid materials deposited in the filter tube 13 outward, and finally discharge through the solid discharge pipe 8. This realizes the simultaneous reaction, separation and slag discharge, and has the ability of continuous or semi-continuous operation.

[0039] The sun gear 9 in the planetary gear pair is also connected with the stirring assembly through the conversion mechanism, wherein the stirring assembly comprises a stirring spindle 15 and a stirring paddle 16 arranged on the stirring spindle 15, and the length of the stirring paddle 16 is shorter than that of the stirring paddle 12, usually 1 / 3 to 1 / 2 of the radius of the horizontal reaction tank 2, so as to avoid interference. The stirring paddle 16 stirs the mixed liquid in the horizontal reaction tank 2, promotes the adsorption effect of the nano-iron on the noble metal such as gold and silver, and the length of the stirring paddle 16 is shorter than that of the stirring paddle 12, so as to avoid collision between the stirring paddle 16 and the stirring paddle 12.

[0040] As shown in Figure 5 and Figure 6 The conversion mechanism comprises a first crank 26 coaxially connected with the sun gear 9, a second crank 25 connected with the stirring spindle 15, and a sliding frame 22 slidingly connected with the driving disc 4. The top and bottom of the driving disc 4 are symmetrically provided with sliding rails 21, the sliding frame 22 slides along the sliding rails 21, and the sliding rails 21 preferably adopt linear guide rails or precisely processed guide grooves, so as to ensure that the sliding frame 22 can only smoothly slide along the preset track.

[0041] The sliding frame 22 is provided with a limiting groove, and the ends of the first crank 26 and the second crank 25 are provided with sliding blocks slidingly connected in the limiting groove, so as to convert the rotary motion of the first crank 26 into the linear reciprocating motion of the sliding frame 22, and then convert it into the reciprocating swing of the second crank 25.

[0042] The stirring mode of reciprocating swing can produce stronger fluid shear force and directionally changing turbulent flow compared with uniform rotation, more effectively breaks the concentration boundary layer around the reactants, greatly increases the collision probability of the nano-iron and the noble metal ions; and in the horizontal reaction tank 2, the mixed liquid is basically accumulated at the bottom of the horizontal reaction tank 2, and the reciprocating swing stirring mode enables the stirring paddle 16 to more fully stir the mixed liquid, reducing the proportion of useless work of the stirring paddle.

[0043] The length of the first crank 26 is less than the length of the second crank 25, and the length of the first crank 26 and the length of the second crank 25 satisfy the following relationship: ; In the formula, is the included angle of the stirring paddle 16 in the horizontal reaction tank 2, usually 90° to 150°, is the length of the first crank 26, is the length of the second crank 25.

[0044] The crank lengths r and R are designed according to the required stirring range. For example, the stirring paddle covers the central area of the tank, the swing angle θ = 90°, and sin(45°) ≈ 0.707 = r / R, that is, R is about 1.414 times r.

[0045] This converts the rotation of the sun gear 9 into the reciprocating motion of the stirring blade 16 within the horizontal reaction vessel 2, facilitating the stirring of the mixture within the horizontal reaction vessel 2 by the stirring blade 16, avoiding unnecessary movement of the stirring blade 16, and preventing collision between the stirring blade 16 and the filter tube 13.

[0046] like Figure 5 , Figure 6 and Figure 7 As shown, a feeding control mechanism is also provided inside the drive disk 4. The feeding control mechanism includes a ratchet 17 that is rotatably connected to the inner wall of the drive disk 4, a pawl 24 that is connected to the sliding frame 22 via a connecting rod 23, and a fixed sleeve 18 that is fixedly connected inside the drive disk 4.

[0047] Ratchet 17 is connected to the inner wall of drive disc 4 via ratchet shaft 27. Pad 24 is mounted on the end of connecting rod 23 via elastic hinge. Fixed sleeve 18 is sleeved on ratchet shaft 27. The side wall of fixed sleeve 18 is provided with two electrical connecting pieces 29. The electrical connecting pieces 29 are connected between the power supply and the electrically controlled valve on nano-iron suspension feed pipe 6. The side wall of ratchet 17 is provided with a conductive strip 28 that can be electrically connected to the electrical connecting pieces 29. When the conductive strip 28 is electrically connected to the two electrical connecting pieces 29, the electrically controlled valve on nano-iron suspension feed pipe 6 is energized and opened.

[0048] The power supply, two electrical connectors 29, conductive strip 28, and the electrically controlled valve on the nano-iron suspension feed pipe 6 together form a circuit. The circuit is only connected when the conductive strip 28 simultaneously contacts both electrical connectors 29, and the valve opens instantaneously. The arc length of the conductive strip 28 determines the duration of each opening.

[0049] Because a single addition of nano-iron can lead to a large amount of nano-iron reacting ineffectively with non-target components in the wastewater, failing to fully utilize it for reducing precious metals, this results in reagent waste and increased costs. In this embodiment, a feeding control mechanism combined with stirring is used to automate and precisely add nano-iron through mechanical logic, avoiding the uncertainties of manual operation, optimizing reagent consumption, and improving process control. Specifically: The electrically controlled valve on the nano-iron suspension feed pipe 6 is only triggered when the ratchet 17 reaches a specific position. This enables automatic replenishment of small doses in multiple batches, dynamically maintaining the optimal concentration of nano-iron in the reaction system according to the reaction progress. This avoids ineffective losses caused by excessively high initial concentrations, improves its selectivity and utilization rate for precious metals, and reduces operating costs. Furthermore, after entering the horizontal mixing tank 2, the nano-iron suspension is stirred by the impeller 16, ensuring that newly added reagents are immediately dispersed, preventing agglomeration and deactivation due to excessively high local concentrations.

[0050] The embodiment adopts motor 3 to drive planetary gear pair to operate, so that the rotation of sun gear 9 drives gear ring 11 and rotating ring 20 through planetary gear 10, so that paddle 12 rotates at a constant speed, paddle 12 continuously scoops up the mixture of sewage containing precious metals at the bottom of the tank and nano iron and throws it into the open end of filter pipe 13; at the same time, helical roller 14 coaxial with planetary gear 10 rotates synchronously and is ready to transport the intercepted solid substances at any time; on the other hand, sun gear 9 drives stirring shaft 15 to reciprocate through first crank 26, sliding frame 22 and second crank 25, stirring paddle 16 stirs the liquid in the tank violently to promote the reaction; and the reciprocating movement of sliding frame 22 drives pawl 24 through connecting rod 23, and pawl 24 drives ratchet 17 to rotate by one tooth position every time a reciprocating cycle is completed; when ratchet 17 rotates to a specific position, conductive strip 28 on ratchet 17 connects two electrically connected pieces 29, and the electric control valve on nano iron suspension feeding pipe 6 is opened instantaneously to inject a small amount of nano iron suspension into the reaction tank. Subsequently, ratchet 17 rotates, the circuit is disconnected, and the drug injection stops. This process is repeated. The whole device has continuous or semi-continuous operation capability, reduces downtime, improves processing capacity, and is suitable for large-scale industrial applications.

[0051] That is, gear ring 11 in the planetary gear pair drives paddle 12 to rotate, providing power for the solid-liquid separation of the mixed liquid; planetary gear 10 in the planetary gear pair drives helical roller 14 to rotate, actively transporting the solid products in the filter pipe outward to realize continuous discharge; sun gear 9 in the planetary gear pair drives stirring paddle 16 to reciprocate through the conversion mechanism to realize the intensive mixing of the mixed liquid to intensify the reaction effect; at the same time, the movement process of the conversion mechanism cooperates with the feeding control mechanism to automatically control the addition of nano iron and realize the precise drug injection process. Through pure mechanical linkage, high integration and synchronization of functions are realized, the rhythm of reaction, separation, slag discharge and material supplementing is consistent, the operation is stable and reliable, and the energy consumption is significantly reduced.

[0052] In the implementation process of the present application, the following steps are included: Step S1, device initialization: start motor 3 to drive sun gear 9 through a reducer. The planetary gear system starts to work, and the whole device enters a standby state; Step S2, sewage and reaction solvent addition: sewage and nano iron suspension are introduced into horizontal reaction tank 2; Step S3, mixing reaction and solid-liquid separation: drive the stirring assembly and the stirring assembly to operate through the power component, adopt the reciprocating stirring mode to stir the mixed liquid in horizontal reaction tank 2, and use paddle 12 to stir the mixed liquid into filter pipe 13 for solid-liquid separation; Step S4, reaction solvent automatic supplement: the electric control valve on the nano-iron suspension feeding pipe 6 is periodically opened and closed by the feeding control mechanism to automatically supply nano-iron suspension into the horizontal reaction tank 2, so that the segmented nano-iron suspension supply is adopted to improve the recovery effect of noble metals such as gold and silver; Step S5, material separation: after the liquid passes through the filtering pipe 13, it is discharged, the noble metals such as gold and silver adsorbed by the nano-iron are intercepted in the filtering pipe 13, and are driven by the spiral roller 14 to pass through the solid discharge pipe 8 and be discharged, and the reacted sewage is periodically discharged through the liquid discharge pipe 7.

[0053] It can be seen that, by a series of ingenious mechanical designs, the dynamic separation, continuous slagging, intelligent adding and high-efficiency stirring are highly integrated in the embodiment, the functions of nano-iron and noble metal reaction, stirring, mixed liquid filtration and timed feeding are achieved, the problems of efficiency, cost and automation in the process of recovering noble metals by nano-iron are successfully solved, the embodiment is suitable for noble metal recovery in the fields of electroplating, electronic waste liquid and the like, and has the advantages of high recovery rate, low operation cost and easy maintenance.

[0054] The above embodiment is only a preferred embodiment for fully illustrating the present application, and the protection scope of the present application is not limited thereto. The equivalent replacement or transformation of the skilled in the art on the basis of the present application is within the protection scope of the present application.

Claims

1. An integrated noble metal recovery nanoscale iron reaction device, characterized in that, The application relates to a noble metal recovery nano-iron reaction device. The device comprises a horizontal reaction tank, a feeding assembly for feeding sewage and nano-iron suspension into the horizontal reaction tank, a filter pipe arranged in the horizontal reaction tank and parallel to the axis of the horizontal reaction tank, the top of the filter pipe being provided with an opening higher than the liquid level of the horizontal reaction tank, a stirring assembly arranged in the horizontal reaction tank, the stirring assembly comprising a stirring main shaft driven by a power element and stirring blades arranged on the stirring main shaft, a stirring assembly arranged in the horizontal reaction tank, the stirring assembly comprising a stirring main shaft driven by the power element and stirring blades arranged on the stirring main shaft, a driving disc arranged at one end of the horizontal reaction tank, a partition plate arranged between the horizontal reaction tank and the driving disc, a rotating ring arranged at the end of the gear ring and sealingly connected to the inner wall of the driving disc, the rotating ring penetrating the partition plate and being connected to the stirring blades, a conversion mechanism arranged between the sun gear and the stirring main shaft, the conversion mechanism comprising a first crank coaxially connected to the sun gear, a second crank connected to the stirring main shaft and a sliding frame slidingly connected to the side wall of the horizontal reaction tank, limit grooves arranged on the sliding frame, sliding blocks arranged at the ends of the first crank and the second crank and slidingly connected in the limit grooves, the length of the first crank being smaller than the length of the second crank, the length of the first crank and the length of the second crank satisfying the following relation: L1 / L2=1 / 2, the feeding assembly comprising a sewage feeding pipe and a nano-iron suspension feeding pipe, electric valves arranged on the feeding pipe and the nano-iron suspension feeding pipe, a feeding control mechanism comprising a ratchet wheel rotatably connected to the outer wall of the horizontal reaction tank, a pawl arranged on the sliding frame and a fixed sleeve fixedly connected to the outer wall of the horizontal reaction tank, two electric connection sheets arranged on the side wall of the fixed sleeve, and a conductive strip arranged on the side wall of the ratchet wheel and electrically connected to the electric connection sheets, the electric valve arranged on the nano-iron suspension feeding pipe being opened when the conductive strip is electrically connected to the two electric connection sheets, a helical roller coaxially connected to the planet wheel of the planetary gear transmission pair, the helical roller extending into the filter pipe and being rotatably connected to the inner wall of the filter pipe, the cross section of the stirring blade being L-shaped, and one end of the stirring blade being inclined towards the opening when the stirring blade rotates to the upper side of the opening, and a noble metal recovery nano-iron reaction method, which comprises the following steps: S1, equipment initialization; S2, sewage and reaction solvent addition: feeding sewage and nano-iron suspension into the horizontal reaction tank through the feeding assembly; S3, reaction: stirring the sewage and nano-iron suspension in the horizontal reaction tank; S4, separation: separating the nano-iron from the sewage; S5, collection: collecting the nano-iron; and S6, noble metal recovery: recovering the noble metal from the nano-iron.

10. The application relates to a noble metal recovery nano-iron reaction device. ​ ​ ​ 2. The integrated noble metal recovery nanoscale iron reaction apparatus of claim 1, wherein: ​ 3. The integrated noble metal recovery nanoscale iron reaction apparatus of claim 2, wherein: ​ 4. The integrated noble metal recovery nanoscale iron reaction apparatus of claim 3, wherein: ​ 5. The integrated noble metal recovery nanoscale iron reaction apparatus of claim 3 or 4, wherein: ​ ​ ​ ； wherein is the included angle of the stirring blade in the horizontal reaction tank, is the length of the first crank, is the length of the second crank.

6. The integrated noble metal recovery nanoscale iron reaction apparatus of claim 5, wherein: ​ 7. The integrated noble metal recovery nanoscale iron reaction apparatus of claim 6, wherein: ​ ​ ​ 8. The integrated noble metal recovery nanoscale iron reaction apparatus of claim 3 or 4, wherein: ​ 9. The integrated noble metal recovery nanoscale iron reaction apparatus of claim 1, wherein: ​ ​ ​ ​ Step S3, mixing reaction and solid-liquid separation, through the driving of the dynamic part, the mixing liquid is stirred into the filter pipe by the stirring paddle for solid-liquid separation; Step S4, reaction solvent supplement: the feeding assembly is controlled to be opened and closed periodically to supply the nano-iron suspension into the horizontal reaction tank in stages; Step S5, material separation: the noble metals such as gold and silver adsorbed by the nano-iron are discharged through the solid discharge pipe, and the sewage after reaction is discharged through the liquid discharge pipe.

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