An apparatus for recovering solid elemental silver from a metal-containing waste solution

Abstract

The utility model is suitable for metal recovery technical field provides a kind of device for recovering solid silver element from metal-containing waste liquid, including reaction tank, inlet and outlet assembly, the stirring assembly being arranged in the inside of reaction tank, with the liquid adding assembly being communicated with reaction tank and the filter assembly being arranged in the bottom of reaction tank, the liquid adding assembly includes the liquid storage tank being arranged in the bottom of reaction tank, the liquid storage tank inside forms the liquid adding cavity being communicated with secondary reaction cavity, liquid adding valve is arranged between the liquid adding cavity and secondary reaction cavity, the filter assembly includes liquid storage bin and the filter bin being arranged in the inside of liquid storage bin.This device solves the problem that traditional device can only filter valuable metal, cannot continuously react and directly recover silver element from anode slime waste liquid, achieves the ability from gold separation treated waste liquid, continuously through leaching and reduction reaction, recovery and purification silver element and separate solution and silver element, improve silver element recovery and purification efficiency.

Description

Technical Field

[0001] This utility model relates to the field of metal recycling technology, and more specifically, it relates to a device for recovering solid elemental silver from metal-containing waste liquid. Background Technology

[0002] Anode slime is a sludge-like substance that adheres to the surface of the anode substrate, settles at the bottom of the electrolytic cell, or is suspended in the electrolyte during electrolytic refining. Anode slime is enriched with most or all of the precious metals and some rare elements from ores, concentrates, or fluxes, thus possessing high comprehensive recycling value. After various reaction treatments, elemental copper, gold, and silver can be extracted from anode slime.

[0003] Patent CN207899089U discloses a wastewater filtration device for gold and silver extraction from copper anode mud, comprising a shell, a filter plate, a cam, a push rod, and a motor; the upper end of the shell is a wastewater inlet, and the lower end is a water outlet for discharging clean water; the filter plate is located inside the shell, and a baffle is provided inside the shell at a position corresponding to the upper part of the filter plate, and the baffle is evenly provided with through holes to disperse the wastewater before it passes through the filter plate.

[0004] While the aforementioned device can disperse wastewater through baffles before it passes through the filter plate, increasing the contact area between the wastewater and the filter plate, and allowing the filter plate to slide up and down repeatedly under the action of the cam, thus significantly improving the filtration efficiency, it can only filter valuable metals in the waste liquid. It cannot systematically treat the gold-separated slag after the anode mud has undergone gold separation treatment, nor can it recover and replace elemental silver from the waste liquid of the gold-separated slag. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a device for recovering solid silver from metal-containing waste liquid through continuous leaching and reduction reactions, separating the solution and the silver, thereby improving the efficiency of silver recovery and purification.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An apparatus for recovering solid elemental silver from metal-containing waste liquid includes a reaction vessel, an inlet / outlet assembly, a stirring assembly disposed inside the reaction vessel, a liquid addition assembly communicating with the reaction vessel, and a filter assembly disposed at the bottom of the reaction vessel. The reaction vessel has an insulation layer inside, forming a reaction chamber within the insulation layer. A secondary reaction chamber is formed at the bottom of the reaction chamber. A water bath chamber is formed between the outer wall of the insulation layer and the reaction vessel. The liquid addition assembly includes a storage tank disposed at the bottom of the reaction vessel. A liquid addition chamber communicating with the secondary reaction chamber is formed inside the storage tank. A liquid addition valve is disposed between the liquid addition chamber and the secondary reaction chamber. The filter assembly includes a storage compartment and a filter compartment disposed inside the storage compartment.

[0008] The present invention is further configured such that: a guide tube is connected to the bottom of the reaction chamber, and the guide tube is connected downward to the secondary reaction chamber.

[0009] The present invention is further configured such that: the inlet and outlet assembly includes an inlet pipe and a feed pipe disposed at the top of the reaction tank and an outlet pipe disposed at the bottom of the reaction tank, the inlet pipe and the feed pipe being located on both sides of the reaction tank respectively, and the inlet pipe and the feed pipe being connected to the reaction chamber.

[0010] The present invention is further configured such that: the discharge pipe is connected to the secondary reaction chamber, the discharge pipe is located above the liquid storage tank, and a discharge valve is provided on the discharge pipe.

[0011] The present invention is further configured such that: the stirring assembly includes a mounting frame, a motor and a stirring shaft, the mounting frame is installed on the top of the reaction vessel, the motor is installed on the mounting frame, and the stirring shaft passes through the reaction vessel and extends into the interior of the reaction chamber.

[0012] The present invention is further configured such that: a plurality of stirring blades are arranged around the stirring shaft, and a spiral conveying blade is provided at the bottom of the stirring shaft.

[0013] The present invention is further configured such that: a liquid addition pipe is connected to the top of the liquid storage tank on the side away from the reaction tank, and a diaphragm pump is provided on the side wall of the liquid storage tank on the side away from the reaction tank.

[0014] The present invention is further configured such that: the top of the liquid storage tank and the filter tank are open, the outer wall of the filter tank is attached to the inner wall of the filter tank, and a filter screen is provided on the side wall of the filter tank.

[0015] The beneficial effects of this invention are as follows: After the leaching reaction is completed, the hydrazine liquid inside the addition chamber is added to the secondary reaction chamber under pressure to carry out a reduction reaction to obtain silver powder, which precipitates as elemental silver. The elemental silver and the reaction waste liquid are discharged from the reaction tank and enter the storage tank, where the elemental silver is separated using a filtration chamber. This achieves the goal of continuously recovering and purifying elemental silver through leaching and reduction reactions, and separating the solution and elemental silver, thereby improving the efficiency of silver recovery and purification. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the device for recovering solid silver from metal-containing waste liquid according to this invention.

[0018] Figure 2 for Figure 1 The front view shown.

[0019] Figure 3 for Figure 1 The top view shown.

[0020] Figure 4 for Figure 3 A cross-sectional view showing section line AA.

[0021] Figure 5 for Figure 1 The diagram shows the internal structure of the reaction vessel.

[0022] Figure 6 for Figure 1 The diagram shows the structure of the filter component.

[0023] Figure 7 for Figure 2 The diagram shows the internal structure of the feed hopper.

[0024] Explanation of reference numerals in the attached drawings: 1. Reaction vessel; 11. Insulation layer; 12. Water bath chamber; 13. Reaction chamber; 14. Water bath pipe; 15. Guide pipe; 16. Secondary reaction chamber; 17. Support leg;

[0025] 2. Feeding and discharging assembly; 21. Liquid inlet pipe; 22. Feed pipe; 23. Feed hopper; 24. Separating plate; 25. Feed inlet; 26. Discharge pipe; 27. Discharge valve; 28. Exhaust pipe

[0026] 3. Mixing assembly; 31. Mounting bracket; 32. Motor; 33. Mixing shaft; 34. Mixing blades; 35. Spiral conveyor blades;

[0027] 4. Liquid filling assembly; 41. Liquid storage tank; 42. Liquid filling chamber; 43. Liquid filling pipe; 44. Diaphragm pump; 45. Liquid filling valve;

[0028] 5. Filter assembly; 51. Liquid storage tank; 52. Filter chamber; 53. Filter screen. Detailed Implementation

[0029] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, illustrating only the basic aspects of the present utility model, and therefore only shows the components relevant to the present utility model. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0030] Please refer to Figure 1 An apparatus for recovering solid elemental silver from metal-containing waste liquid includes a reaction tank 1, an inlet / outlet assembly 2, a stirring assembly 3 disposed inside the reaction tank 1, a liquid addition assembly 4 connected to the reaction tank 1, and a filter assembly 5 disposed at the bottom of the reaction tank 1. Anode mud, after undergoing a gold separation reaction, and liquid ammonia are added to the reaction tank 1 through the inlet / outlet assembly 2, mixing to form a metal-containing waste liquid. After steam heating, silver chloride is dissolved through a leaching reaction. Then, hydrazine is introduced into the reaction tank 1 through the liquid addition assembly 4 to react with the metal-containing waste liquid to obtain silver powder, which ultimately precipitates as elemental silver. The elemental silver and the reaction waste liquid are discharged from the reaction tank 1 and then filtered through the filter assembly 5 to separate the elemental silver.

[0031] Please refer to Figure 1-5 The reaction vessel 1 is horizontally positioned, with multiple support legs 17 connected to its bottom, surrounding the bottom of the vessel. The interior of the reaction vessel 1 is hollow, and an insulation layer 11 is installed inside. A reaction chamber 13 is formed inside the insulation layer 11, and a secondary reaction chamber 16 is formed at the bottom of the reaction chamber 13. A water bath chamber 12 is formed between the outer wall of the insulation layer 11 and the reaction vessel 1. A guide pipe 15 is connected to the bottom of the reaction chamber 13, communicating downwards with the secondary reaction chamber 16. The insulation layer 11 and the reaction chamber 13 are not interconnected, nor are the secondary reaction chamber 16. A water bath pipe 14 is installed on the side wall of the reaction vessel 1, extending through the side wall into the water bath chamber 12. During the reaction, hot water can be transported to the water bath chamber 12 through the water bath pipe 14 to heat the metal waste liquid inside the reaction chamber 13.

[0032] Please refer to Figure 1-5 and Figure 7The inlet / outlet assembly 2 includes an inlet pipe 21 and a feed pipe 22 located at the top of the reaction tank 1, and an outlet pipe 26 located at the bottom of the reaction tank 1. The inlet pipe 21 and feed pipe 22 are located on opposite sides of the reaction tank 1 and are connected to the reaction chamber 13. A valve is installed on the inlet pipe 21, which can be connected to a pipeline. Liquid ammonia can be transported to the inlet pipe 21 through the pipeline and then added into the reaction chamber 13. A feed hopper 23 is connected to the top of the feed pipe 22. A feed inlet 25 is opened at the top of the feed hopper 23. Multiple partition plates 24 are rotatably installed inside the feed hopper 23. The ends of the partition plates 24 are connected to rotating shafts, dividing the feed hopper 23 into multiple chambers. A motor can be installed on the side wall of the feed hopper 23, and the motor output shaft is connected to the rotating shaft at the end of the partition plate 24. The motor drives multiple separator plates 24 to rotate. During rotation, the gold-separated slag formed after the anode mud undergoes gold separation treatment can enter the chamber formed by the separator plates 24 through the feed inlet 25. As the separator plates 24 rotate, it enters the feed pipe 22 and finally flows downward into the reaction chamber 13, where it mixes with liquid ammonia to form metal waste liquid. The discharge pipe 26 is connected to the secondary reaction chamber 16 and is located above the storage tank 51. The discharge pipe 26 is equipped with a discharge valve 27. After opening the discharge valve 27, the mixture of silver elemental and solution after the reaction can be discharged through the discharge pipe 26 into the storage tank 51 for filtration and separation. An exhaust pipe 28 is connected to the side wall of the reaction tank 1. The exhaust pipe 28 is located at the top of the reaction tank 1 and connects to the reaction chamber 13. The ammonia leaching waste gas (mainly NH3) generated during the leaching and reduction reactions can be discharged through the exhaust pipe 28 for further purification treatment.

[0033] Please refer to Figure 1-5The stirring assembly 3 includes a mounting frame 31, a motor 32, and a stirring shaft 33. The mounting frame 31 is fixedly installed on the top of the reaction tank 1, and the motor 32 is mounted on the mounting frame 31. The output shaft of the motor 32 is connected to the stirring shaft 33, which passes through the reaction tank 1 and extends into the reaction chamber 13. Multiple stirring blades 34 are arranged around the stirring shaft 33. The motor 32 can drive the stirring shaft 33 to rotate, and the stirring blades 34 rotate synchronously during the rotation of the stirring shaft 33. Before the leaching reaction, the rotation of the stirring blades 34 can be used to accelerate the mixing of the gold-separating slag and liquid ammonia, ensuring uniform dissolution of the metal waste liquid; during the leaching reaction, the rotation of the stirring blades 34 can be used to accelerate the leaching reaction. A spiral conveying blade 35 is provided at the bottom of the stirring shaft 33, and the spiral conveying blade 35 rotates synchronously during the rotation of the stirring shaft 33. After the leaching reaction is completed, the leachate enters the secondary reaction chamber through the guide pipe 15. The rotation of the spiral conveying blade 35 can accelerate the mixing of the leachate and hydrazine, thus accelerating the reduction reaction. After the reduction reaction is completed, the rotation of the spiral conveying blade 35 can transport the elemental silver in the solution to the discharge pipe 26, facilitating the discharge of elemental silver.

[0034] Please refer to Figure 1-4 The liquid addition assembly 4 includes a storage tank 41 located at the bottom of the reaction tank 1, which is fixedly connected to the insulation layer 11 from the outer wall of the reaction tank 1 inwards. Inside the storage tank 41, a liquid addition chamber 42 is formed, communicating with the secondary reaction chamber 16. A liquid addition valve 45 is installed between the liquid addition chamber 42 and the secondary reaction chamber 16, controlling the communication between them. It should be noted that the liquid addition valve 45 can be a flange-type shut-off valve or a percentage-adjustable shut-off valve, capable of both tight shut-off and flow regulation, and a check valve is connected in series to prevent backflow of the solution in the secondary reaction chamber 16. A liquid addition pipe 43 is connected to the top of the storage tank 41 on the side furthest from the reaction tank 1. The liquid addition pipe 43 communicates with the liquid addition chamber 42, and a valve is installed on the liquid addition pipe 43. Opening the valve allows hydrazine liquid to be introduced into the liquid addition chamber 42 through the liquid addition pipe 43. A diaphragm pump 44 is installed on the side wall of the storage tank 41 away from the reaction tank 1. The diaphragm pump 44 can continuously pump hydrazine liquid into the secondary reaction chamber 16 under high pressure, thereby completing the addition of hydrazine liquid by pressurization.

[0035] Please refer to Figure 1-2 and Figure 6The filter assembly 5 includes a storage tank 51 and a filter chamber 52 disposed inside the storage tank 51. Both the storage tank 51 and the filter chamber 52 have openings at the top. The outer wall of the filter chamber 52 is flush with its inner wall, and a filter screen 53 is provided on the side wall of the filter chamber 52. A handle is provided at the top of the filter chamber 52. After the reaction is complete, the mixture of elemental silver and solution is discharged into the storage tank 51 through the discharge pipe 26. The filter chamber 52 is removed from the storage tank 51 using the handle. The filter screen 53 filters and separates the elemental silver and solution mixture, keeping the elemental silver inside the filter chamber 52 while the solution mixture remains inside the storage tank 51.

[0036] After the anode mud undergoes the gold separation reaction, the gold-separated slag and liquid ammonia are added to reaction chamber 13 and mixed evenly. Then, steam heating is applied to induce a leaching reaction to dissolve silver chloride. The leaching solution enters secondary reaction chamber 16, where hydrazine liquid from addition chamber 42 is added under pressure for a reduction reaction to obtain silver powder, which precipitates as elemental silver. The elemental silver and reaction waste liquid are discharged from reaction tank 1 and enter storage chamber 51, where elemental silver is separated using filter chamber 52. This process achieves the goal of continuously recovering and purifying elemental silver through leaching and reduction reactions, and separating the solution and elemental silver, thereby improving the efficiency of silver recovery and purification.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An apparatus for recovering solid elemental silver from metal-containing waste liquid, characterized in that: The reaction vessel includes a reaction tank (1), a feeding and discharging assembly (2), a stirring assembly (3) disposed inside the reaction tank (1), a liquid addition assembly (4) communicating with the reaction tank (1), and a filter assembly (5) disposed at the bottom of the reaction tank (1). The reaction tank (1) is provided with a heat insulation layer (11), and a reaction chamber (13) is formed inside the heat insulation layer (11). A secondary reaction chamber (16) is formed at the bottom of the reaction chamber (13). A water bath chamber (12) is formed between the outer wall of the heat insulation layer (11) and the reaction tank (1). The liquid addition assembly (4) includes a storage tank (41) disposed at the bottom of the reaction tank (1). A liquid addition chamber (42) communicating with the secondary reaction chamber (16) is formed inside the storage tank (41). A liquid addition valve (45) is provided between the liquid addition chamber (42) and the secondary reaction chamber (16). The filter assembly (5) includes a storage chamber (51) and a filter chamber (52) disposed inside the storage chamber (51).

2. The apparatus for recovering solid elemental silver from metal-containing waste liquid according to claim 1, characterized in that: The bottom of the reaction chamber (13) is connected to a guide pipe (15), which is connected downward to the secondary reaction chamber (16).

3. The apparatus for recovering solid elemental silver from metal-containing waste liquid according to claim 2, characterized in that: The feeding and discharging assembly (2) includes a liquid inlet pipe (21) and a feed pipe (22) located at the top of the reaction tank (1) and a discharge pipe (26) located at the bottom of the reaction tank (1). The liquid inlet pipe (21) and the feed pipe (22) are located on both sides of the reaction tank (1) and are connected to the reaction chamber (13).

4. The apparatus for recovering solid elemental silver from metal-containing waste liquid according to claim 3, characterized in that: The discharge pipe (26) is connected to the secondary reaction chamber (16). The discharge pipe (26) is located above the liquid storage tank (51). The discharge pipe (26) is equipped with a discharge valve (27).

5. The apparatus for recovering solid elemental silver from metal-containing waste liquid according to claim 1, characterized in that: The stirring assembly (3) includes a mounting frame (31), a motor (32) and a stirring shaft (33). The mounting frame (31) is mounted on the top of the reaction vessel (1), the motor (32) is mounted on the mounting frame (31), and the stirring shaft (33) is set through the reaction vessel (1) and extends into the reaction chamber (13).

6. The apparatus for recovering solid elemental silver from metal-containing waste liquid according to claim 5, characterized in that: Multiple stirring blades (34) are arranged around the stirring shaft (33), and a spiral conveying blade (35) is arranged at the bottom of the stirring shaft (33).

7. The apparatus for recovering solid elemental silver from metal-containing waste liquid according to claim 1, characterized in that: The top of the storage tank (41) away from the reaction tank (1) is connected to a liquid addition pipe (43), and a diaphragm pump (44) is provided on the side wall of the storage tank (41) away from the reaction tank (1).

8. The apparatus for recovering solid elemental silver from metal-containing waste liquid according to claim 1, characterized in that: The top openings of the liquid storage chamber (51) and the filter chamber (52) are provided, the outer wall of the filter chamber (52) is attached to the inner wall of the filter chamber (52), and the side wall of the filter chamber (52) is provided with a filter screen (53).

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