Multi-stage leaching device and method for recovering precious metal from precious metal-containing material

Abstract

The invention discloses a precious metal recovery multi-stage leaching device and method for a precious metal-containing material, the precious metal recovery multi-stage leaching device for the precious metal-containing material comprises a multi-stage reaction tank, a multi-stage washing tank and a material transfer mechanism, the multi-stage reaction tank is used for leaching and dissolving gold from a gold-containing material and is provided with a solution discharge end; the multi-stage washing tank is arranged close to the multi-stage reaction tank, is used for sequentially carrying out multi-stage washing on the gold-containing material subjected to gold leaching and dissolving through the multi-stage reaction tank, and is provided with a solution discharge end; and the material transfer mechanism is erected between the multi-stage reaction tank and the multi-stage washing tank and is provided with a movable end for carrying materials to be freely transferred between the multi-stage reaction tank and the multi-stage washing tank. In the sequential leaching process of the multi-stage reaction tanks, emptying of the first-stage reaction tank is used as a selection condition, when the first-stage reaction tank is emptied, other reaction tanks are sequentially increased by one stage, and a new last-stage reaction tank is configured, so that the subsequent possible waiting time for containing precious metal is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of precious metal recovery, and in particular to a precious metal recovery multi-stage leaching device and method for precious metal-containing materials. Background Art

[0002] The discarded circuit boards obtained by dismantling electronic waste such as discarded mobile phones, televisions, computers, etc. contain a variety of precious metals such as gold, silver, platinum, etc. Recycling these precious metals from discarded circuit boards has important economic and environmental significance.

[0003] In industrial practice, high-temperature smelting is usually used to enrich and separate the metals in the discarded circuit boards to obtain precious metal-containing materials and other metal materials, and then chemical agents are used to leach the target precious metals in the precious metal-containing materials to form corresponding precious metal-containing solutions, and then subsequent treatment is performed to extract the precious metals. For example, Chinese Patent 202111656299.2 discloses a method for enriching precious metals from poor and impure materials, in which a nickel-iron alloy containing precious metals is atomized and powdered to obtain a nickel-iron alloy powder containing precious metals, and anhydrous ferric chloride is added to leach the nickel-iron metal in the nickel-iron powder containing precious metals, and a precious metal enrichment and a leachate mainly containing ferrous chloride are obtained, respectively. In the leaching of precious metals, a multi-stage reaction tank can be used for leaching in sequence to avoid unclean leaching of precious metals.

[0004] For the above-mentioned prior art, the current multi-stage leaching method needs to be emptied when the concentration of precious metals in the first reaction tank reaches a certain level. This emptying process requires waiting, and a waiting time is required when the concentration of precious metals in the solution in each tank reaches a certain level. In addition, since the first-stage reaction tank is the first to react with the precious metal-containing material, its concentration is relatively high. After the subsequent replenishment of the liquid medicine, it is still the first-stage reaction, and it is still easy to be higher than the concentration in the subsequent reaction tanks, reaching the corresponding metal concentration value before other reaction tanks, resulting in the use of old water in other reaction tanks for a long time, affecting the leaching quality. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose a multi-stage leaching device and method for precious metal recovery of precious metal-containing materials, so as to solve the technical problems of long waiting time for multi-stage leaching emptying and slow replacement of old water in the prior art.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a multi-stage leaching device for recovering precious metals from precious metal-containing materials, comprising: A multi-stage reaction tank, used for leaching gold from gold-containing materials, and having a solution discharge end; A multi-stage water washing tank, which is arranged adjacent to the multi-stage reaction tank, and is used to sequentially perform multi-stage water washing on the gold-containing material after the gold is leached and dissolved in the multi-stage reaction tank, and has a solution discharge end; and The material transfer mechanism is set up between the multi-stage reaction tank and the multi-stage water washing tank, and is provided with a movable end for freely transferring the materials between the multi-stage reaction tank and the multi-stage water washing tank.

[0007] In some embodiments, the material transfer mechanism includes a lifting mechanism, a linear drive mechanism, a clamping mechanism and a placement component. The linear drive mechanism has a movable end that moves along the arrangement direction of the reaction tank and the water washing tank. The lifting mechanism is installed on the movable end of the linear drive mechanism and has a movable end that lifts vertically. The clamping mechanism is installed on the movable end of the lifting mechanism. The clamping mechanism has a clamping end for clamping the placement component, so that the placement component has a first position state of being clamped, and a second position state of being unclamped and placed in the reaction tank or the water washing tank.

[0008] In some embodiments, the storage assembly includes a mesh basket and a storage rack. The mesh basket is detachably mounted on the inner side of the storage rack. When the storage rack is in the second position, it is mounted on the reaction tank or the washing tank, and the mesh basket is immersed in the interior of the corresponding tank.

[0009] In some embodiments, the storage assembly further includes a rotation drive assembly, the mesh basket is rotationally connected to the storage rack, and the driving end of the rotation drive assembly is transmission-connected to the rotating shaft of the mesh basket to drive the mesh basket to rotate.

[0010] In a second aspect, the present invention further provides a multi-stage leaching method for recovering precious metals from precious metal-containing materials, which is used in any of the multi-stage leaching devices for recovering precious metals from precious metal-containing materials described above, and the specific method is as follows: The multi-stage reaction tanks are all equipped with reagent solutions of the same concentration. The precious metal-containing material is first leached in the first-stage reaction tank to dissolve the precious metal, then in the second-stage reaction tank to dissolve the precious metal, and then in the last-stage reaction tank in turn. During the leaching process, the target metal concentration in each stage of the reaction tank is tracked. If the metal concentration in the first stage of the reaction tank does not reach the target value, the precious metal-containing material is still sequentially leached in multiple stages of reaction tanks according to the number of stages. If the metal concentration in the first stage of the reaction tank reaches the target value, the next step is entered; If the metal concentration in the first-stage reaction tank reaches the target value, the precious metal solution in the first-stage reaction tank is drained to the next process flow, and at the same time, the other reaction tanks are adjusted up one level in turn, and a new final-stage reaction tank is configured.

[0011] In some embodiments, the method further comprises the following steps: After the precious metals are leached out in the multi-stage reaction tank, the precious metal-containing materials enter the multi-stage water washing tank. The precious metal-containing materials are first washed in the first-stage water washing tank, then washed in the second-stage water washing tank, and then washed in the last-stage water washing tank in sequence to dilute and wash the solution of the reaction tank carried by the materials.

[0012] In some embodiments, the method further comprises the following steps: If the metal concentration in the first-stage reaction tank reaches the target value, the precious metal solution in the first-stage reaction tank is drained to the next process flow, and at the same time, the other reaction tanks are adjusted up one level in turn, and the original first-stage reaction tank is configured as the new last-stage reaction tank.

[0013] In some embodiments, the method further comprises the following steps: If the metal concentration in the first-stage reaction tank reaches the target value, the precious metal solution in the first-stage reaction tank is drained to the next process flow, and at the same time, the other reaction tanks are adjusted up one level in turn, and the first-stage water washing tank is simultaneously added with reagents to configure it into a new last-stage reaction tank, and the original first-stage reaction tank is injected with washing water to adjust it to the last-stage water washing tank.

[0014] In some embodiments, the method further comprises the following steps: If the metal concentration in the first-stage reaction tank reaches the target value, the precious metal solution in the first-stage reaction tank is drained to the next process flow, and at the same time, the other reaction tanks are adjusted up one level in turn, and the first-stage water washing tank is simultaneously added with reagents to be configured as a new last-stage reaction tank; an idle transfer water washing tank is also arranged, and when the first-stage water washing tank is adjusted to the last-stage reaction tank, the transfer water washing tank is adjusted to the last-stage water washing tank, and the original first-stage reaction tank is injected with washing water to be adjusted to the transfer water washing tank.

[0015] In some embodiments, the reaction tank and the water washing tank both monitor the target metal concentration and the reagent concentration.

[0016] Compared with the prior art, the multi-stage leaching method for precious metal recovery of precious metal-containing materials provided by the present invention uses the emptying of the first-stage reaction tank as a selection condition in the sequential leaching process of the multi-stage reaction tanks. When the first-stage reaction tank is emptied, the other reaction tanks are sequentially adjusted up by one level, and a new last-stage reaction tank is configured, thereby reducing the waiting time that may exist for subsequent precious metals. Moreover, after the second-stage reaction tank is adjusted to the first-stage reaction tank, the old water therein can reach the concentration in advance for emptying, thereby avoiding the slow replacement of old water, increasing the replacement cycle, and avoiding the influence of leaching quality caused by the use of old water for too long. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a multi-stage leaching device for recovering precious metals from precious metal-containing materials provided in an embodiment of the present invention; Figure 2 It is a logic block diagram of a multi-stage leaching method for recovering precious metals from precious metal-containing materials provided by an embodiment of the present invention; Figure 3 This is a logic block diagram of a multi-stage leaching method for recovering precious metals from precious metal-containing materials provided in Example 1 of the present invention; Figure 4 This is a logic block diagram of a multi-stage leaching method for recovering precious metals from precious metal-containing materials provided in the second embodiment of the present invention; Figure 5 It is a logic block diagram of a multi-stage leaching method for recovering precious metals from precious metal-containing materials provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problems of long waiting time for multi-stage leaching and slow replacement of old water, the present invention provides a multi-stage leaching method for precious metal recovery of precious metal-containing materials, which can save waiting time and empty the old water in advance after reaching the concentration.

[0020] It should be noted that the multi-stage leaching method for recovering precious metals from precious metal-containing materials described in the present invention is used for but not limited to gold-containing materials, etc. For the convenience of explanation, in the present invention, only the multi-stage leaching method for recovering precious metals from precious metal-containing materials is applied to gold-containing materials as an example for explanation, and the principle of applying the multi-stage leaching method for recovering precious metals from precious metal-containing materials to other types of precious metal-containing materials is substantially the same as the principle applied to gold-containing materials, which will not be described in detail here.

[0021] First, see Figure 1 , Figure 1The invention discloses a multi-stage leaching device for recovering precious metals from precious metal-containing materials in one embodiment of the present invention, comprising a multi-stage reaction tank 1, a multi-stage water washing tank 2 and a material transfer mechanism 3. The multi-stage reaction tank 1 is used for leaching gold from gold-containing materials and has a solution discharge end. The multi-stage reaction tank 1 has five reaction tanks 1, and each reaction tank 1 is independently provided with a solution discharge end. The multi-stage water washing tank is arranged adjacent to the multi-stage reaction tank 1 and is used for sequentially washing the gold-containing materials with multi-stage water after leaching gold from the multi-stage reaction tank 2. The multi-stage water washing tank has three water washing tanks 2, and each water washing tank 2 is independently provided with a solution discharge end, while the solution replenishment end can be directly replenished from the notches of the water washing tank 2 and the reaction tank 1. The material transfer mechanism 3 is erected between the multi-stage reaction tank 1 and the multi-stage water washing tank 2, and has a movable end for freely transferring materials between the multi-stage reaction tank and the multi-stage water washing tank, so as to form a purpose of transferring materials from each reaction tank and the water washing tank along the number of stages.

[0022] In a certain embodiment, in order to transfer materials between various reaction tanks and water washing tanks, the material transfer mechanism 3 includes a lifting mechanism 31, a linear drive mechanism 32, a clamping mechanism 33 and a placement component 34. The linear drive mechanism 32 has a movable end that moves along the arrangement direction of the reaction tank 1 and the water washing tank 2. The lifting mechanism 31 is installed on the movable end of the linear drive mechanism 32 and has a movable end that lifts vertically. The clamping mechanism 33 is installed on the movable end of the lifting mechanism 31. The clamping mechanism 33 has a clamping end for clamping the placement component, so that the placement component has a first position state of being clamped, and a second position state of being unclamped and placed in the reaction tank or the water washing tank.

[0023] It can be understood that the linear drive mechanism 32 can adopt a gantry crane, the lifting mechanism 31 can adopt a linear guide pair, and the clamping mechanism 33 can adopt a mechanical claw.

[0024] In one embodiment, in order to facilitate the transportation of the separated materials and solutions, the storage assembly 34 includes a mesh basket 341 and a storage rack 342. The mesh basket 341 is detachably mounted on the inner side of the storage rack 342. When the storage rack 342 is in the second position, it is mounted on the reaction tank 1 or the washing tank 2, and the mesh basket 341 is immersed in the corresponding tank body. The materials are stored in the mesh basket 341, and the mesh holes on the mesh basket 341 are used for the solution to enter and exit. When transporting, the storage rack 342 and the mesh basket 341 are transported together, wherein the mesh basket 341 is used to be immersed in the solution in the tank body, and the storage rack 342 is used to be hung on the tank body.

[0025] In one embodiment, in order to improve the leaching effect of the solution, the storage assembly further includes a rotation drive assembly 35, the rotation drive assembly 35 is mounted on the storage rack 342, the mesh basket 341 is rotatably connected to the storage rack 342, and the driving end of the rotation drive assembly 35 is transmission-connected to the rotating shaft of the mesh basket 341 to drive the mesh basket 341 to rotate. The rotation promotes the contact between the material and the solution, thereby improving the leaching effect.

[0026] Furthermore, the rotation drive assembly 35 is composed of a motor and a pair of spur gears 351. The output shaft of the motor is connected to the upper spur gear 351, driving the upper spur gear to rotate, and the lower spur gear is plugged into the rotating shaft of the mesh basket 341 through a keyway and meshes with the upper spur gear. Through meshing transmission, the mesh basket 341 below is driven to rotate. Thus, the mesh basket 341 is immersed in the solution, and the driving motor is located above the solution.

[0027] Second, see Figure 2 , Figure 2 This is a logic block diagram of a multi-stage leaching method for recovering precious metals from precious metal-containing materials in one embodiment of the present invention. The specific method of the multi-stage leaching method for recovering precious metals from precious metal-containing materials is as follows: S1, the multi-stage reaction tanks are all equipped with reagent solutions of the same concentration, the precious metal-containing material is first leached in the first-stage reaction tank to dissolve the precious metal, then in the second-stage reaction tank to dissolve the precious metal, and then in the last-stage reaction tank, the precious metal-containing material is sequentially leached in the multi-stage reaction tanks according to the number of stages to extract the target metal; S2, tracking the target metal concentration in each stage of the reaction tank during the leaching process. If the metal concentration in the first stage of the reaction tank does not reach the target value, the precious metal-containing material is still sequentially leached in multiple stages of reaction tanks according to the number of stages. If the metal concentration in the first stage of the reaction tank reaches the target value, proceed to the next step; S3, if the metal concentration in the first-stage reaction tank reaches the target value, the precious metal solution in the first-stage reaction tank is drained to the next process flow, and at the same time, the other reaction tanks are adjusted up one level in turn, and a new last-stage reaction tank is configured.

[0028] In this embodiment, the number of stages of the reaction tank is adjusted to be dynamic, and the emptying is performed according to the metal concentration. The first stage is the fastest. When the first stage needs to be emptied, in order to reduce the waiting time, the second stage is adjusted to the first stage, and the subsequent leaching can be continued without the last stage, so as to save waiting time. After emptying, the reaction tank is reconfigured to perform the last stage of leaching. In addition, after the second stage is adjusted to the first stage reaction tank, as the tank body that first reacts with the gold-containing material, the old water in it can reach the concentration in advance for emptying, avoiding the slow replacement of the old water, increasing the replacement cycle, and avoiding the influence of the leaching quality caused by the long-term use of the old water.

[0029] In one embodiment, in order to cooperate with the water washing tank to clean the gold-containing material, and after adjusting the order of the reaction tank, fill the original first-stage reaction tank for subsequent process flow, please refer to Figure 3 The specific method of the multi-stage leaching method for precious metal recovery of precious metal-containing materials is as follows: S1, the multi-stage reaction tanks are all arranged with reagent solutions of the same concentration, the precious metal-containing material is first leached in the first-stage reaction tank to dissolve the precious metal, and then in the second-stage reaction tank to dissolve the precious metal, and then leached to the last-stage reaction tank in sequence, and the target metal is leached in the multi-stage reaction tanks according to the number of stages, and the precious metal-containing material after leaching the precious metal in the multi-stage reaction tanks enters the multi-stage water washing tanks, and the precious metal-containing material is first washed in the first-stage water washing tank, and then washed in the second-stage water washing tank, and then washed in the last-stage water washing tank in sequence, and the solution of the reaction tank carried by the material is diluted and washed; S2, tracking the target metal concentration in each stage of the reaction tank during the leaching process. If the metal concentration in the first stage of the reaction tank does not reach the target value, the precious metal-containing material is still sequentially leached in multiple stages of reaction tanks according to the number of stages. If the metal concentration in the first stage of the reaction tank reaches the target value, proceed to the next step; S3, if the metal concentration in the first-stage reaction tank reaches the target value, the precious metal solution in the first-stage reaction tank is drained to the next process flow, and at the same time, the other reaction tanks are adjusted up one level in turn, and the original first-stage reaction tank is configured as the new last-stage reaction tank.

[0030] In this embodiment, the original first-stage reaction tank is configured as the new last-stage reaction tank, which can be connected to the leaching reaction of the adjusted first-stage tank bodies to form a feasible dynamic cycle adjustment.

[0031] In one embodiment, in order to cooperate with the water washing tank to wash the gold-containing material, further save the time of emptying and waiting, and avoid the loss of precious metals in the water washing tank, please refer to Figure 4 The specific method of the multi-stage leaching method for precious metal recovery of precious metal-containing materials is as follows: S1, the multi-stage reaction tanks are all arranged with reagent solutions of the same concentration, the precious metal-containing material is first leached in the first-stage reaction tank to dissolve the precious metal, and then in the second-stage reaction tank to dissolve the precious metal, and then leached to the last-stage reaction tank in sequence, and the target metal is leached in the multi-stage reaction tanks according to the number of stages, and the precious metal-containing material after leaching the precious metal in the multi-stage reaction tanks enters the multi-stage water washing tanks, and the precious metal-containing material is first washed in the first-stage water washing tank, and then washed in the second-stage water washing tank, and then washed in the last-stage water washing tank in sequence, and the solution of the reaction tank carried by the material is diluted and washed; S2, tracking the target metal concentration in each stage of the reaction tank during the leaching process. If the metal concentration in the first stage of the reaction tank does not reach the target value, the precious metal-containing material is still sequentially leached in multiple stages of reaction tanks according to the number of stages. If the metal concentration in the first stage of the reaction tank reaches the target value, proceed to the next step; S3, if the metal concentration in the first-stage reaction tank reaches the target value, the precious metal solution in the first-stage reaction tank is drained to the next process flow, and at the same time, the other reaction tanks are adjusted up one level in turn, and the first-stage water washing tank is simultaneously added with reagents to configure it into a new last-stage reaction tank, and the original first-stage reaction tank is injected with washing water to adjust it to the last-stage water washing tank.

[0032] In this embodiment, since the original first-stage reaction tank is used as the new last-stage reaction tank to configure the liquid medicine, it is necessary to wait for the reaction tank to be emptied before injecting the configured liquid medicine, which takes a long time; however, by adding the reagent to the first-stage water washing tank, the ratio can be quickly matched and efficiently connected to the original first-stage reaction tanks for the last-stage leaching, and the original first-stage reaction tank is injected with washing water to be adjusted to the last-stage water washing tank, and after multi-stage leaching and washing of the first-stage reaction tanks, the original first-stage reaction tank is adjusted to the last-stage water washing tank for washing. The overall dynamic adjustment and multi-stage connection are more efficient and save time.

[0033] Correspondingly, when the level is raised by one level, the material transfer mechanism is controlled to load materials from the new first-level reaction tank position, and then move to the corresponding next-level reaction tank position for transfer. It can be understood that the entire level adjustment process is to set up a position coordinate system for the five reaction tanks and three washing tanks, and fill in the level number according to the actual situation, a total of eight levels, and transfer materials from each level in turn. That is, in terms of control, the level number is marked, and the material transfer is based on the level number and the corresponding level tank coordinate position to transfer the material.

[0034] In one embodiment, in order to cooperate with the water washing tank to clean the gold-containing material, and to empty and configure the new reaction tank for efficient adjustment and connection, and to avoid the loss of precious metals in the water washing tank, please refer to Figure 5 The specific method of the multi-stage leaching method for precious metal recovery of precious metal-containing materials is as follows: S1, the multi-stage reaction tanks are all arranged with reagent solutions of the same concentration, the precious metal-containing material is first leached in the first-stage reaction tank to dissolve the precious metal, and then in the second-stage reaction tank to dissolve the precious metal, and then leached to the last-stage reaction tank in sequence, and the target metal is leached in the multi-stage reaction tanks according to the number of stages, and the precious metal-containing material after leaching the precious metal in the multi-stage reaction tanks enters the multi-stage water washing tanks, and the precious metal-containing material is first washed in the first-stage water washing tank, and then washed in the second-stage water washing tank, and then washed in the last-stage water washing tank in sequence, and the solution of the reaction tank carried by the material is diluted and washed; S2, tracking the target metal concentration in each stage of the reaction tank during the leaching process. If the metal concentration in the first stage of the reaction tank does not reach the target value, the precious metal-containing material is still sequentially leached in multiple stages of reaction tanks according to the number of stages. If the metal concentration in the first stage of the reaction tank reaches the target value, proceed to the next step; S3, if the metal concentration in the first-stage reaction tank reaches the target value, the precious metal solution in the first-stage reaction tank is drained to the next process flow, and at the same time, the other reaction tanks are adjusted up one level in turn, and the first-stage water washing tank is simultaneously added with reagents to be configured as a new last-stage reaction tank. An idle transfer water washing tank is also arranged. When the first-stage water washing tank is adjusted to the last-stage reaction tank, the transfer water washing tank is adjusted to the last-stage water washing tank, and the original first-stage reaction tank is injected with washing water to be adjusted to the transfer water washing tank.

[0035] In this embodiment, due to the uncertainty of leaching and the number of stages, it takes time to empty the first-stage reaction tank and then inject washing water, and it cannot be well connected with the multi-stage leaching and multi-stage water washing actions. Therefore, in order to configure a new water washing tank as soon as it is emptied, it can be directly connected to the cleaning of the gold-containing material after the original last stage of leaching, avoiding the possible waiting time and forming a process connection without waiting.

[0036] In any of the above embodiments, the reaction tank and the water washing tank both monitor the target metal concentration and the reagent concentration. According to the target metal to be monitored, the corresponding sensors are used for targeted monitoring. When the target metal changes, the reagent will also change accordingly. The corresponding reagent is also monitored using the corresponding sensor, which is not a sole limitation here.

[0037] In any of the above embodiments, the reaction tank and the water washing tank are both provided with a transfer tank for storing reagents. When the water washing tank needs to be adjusted to a reaction tank, the transfer tank injects reagents into the tank body in a proportion according to the corresponding reagent concentration in the water washing tank, so as to quickly configure a new last-stage reaction tank. The transfer tank can monitor the flow rate through a flow valve to proportion the amount of reagents injected.

[0038] In any of the above embodiments, a water replenishment pipe is arranged on the reaction tank and the water washing tank. In order to quickly replenish water, any reaction tank and water washing tank may switch between the leaching reaction and the water washing process. Therefore, in order to quickly fill the washing water, a water replenishment pipe is installed on each reaction tank and water washing tank.

[0039] In any of the above embodiments, in order to achieve a clean metal leaching effect, the number of stages of the reaction tanks is at least five.

[0040] In any of the above embodiments, in order to achieve the purpose of diluting and washing the solution in the reaction tank carried by the material, the number of stages of the water washing tank is at least three.

[0041] It can be understood that the three-stage water washing tank is mainly used to clean the gold-containing materials that have reacted in the gold dissolving reaction tank, and dilute and wash the solution of the gold dissolving reaction tank carried by the materials. With the increase in the number of cleaning times, the concentration of the gold-containing solution in the water washing tank gradually increases. When a certain level of the gold dissolving reaction tank reaches the required discharge, the solution in the water washing tank can be used to configure the gold dissolving agent as the new level of gold dissolving reaction tank. This circulation mode can control the stability of the gold-containing solution indicators and avoid various problems such as low recovery rate caused by low concentration discharge, loss of precious metals and waste of drugs caused by new configuration.

[0042] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A multi-stage leaching device for recovering precious metals from precious metal-containing materials, characterized in that: include: A multi-stage reaction tank, used for leaching gold from gold-containing materials, and having a solution discharge end; A multi-stage water washing tank, which is arranged adjacent to the multi-stage reaction tank and is used to sequentially perform multi-stage water washing on the gold-containing material after the gold is leached and dissolved in the multi-stage reaction tank, and has a solution discharge end; as well as The material transfer mechanism is set up between the multi-stage reaction tank and the multi-stage water washing tank, and is provided with a movable end for freely transferring the materials between the multi-stage reaction tank and the multi-stage water washing tank.

2. The multi-stage leaching device for recovering precious metals from precious metal-containing materials according to claim 1, characterized in that: The material transfer mechanism includes a lifting mechanism, a linear drive mechanism, a clamping mechanism and a placement component. The linear drive mechanism has a movable end that moves along the arrangement direction of the reaction tank and the water washing tank. The lifting mechanism is installed on the movable end of the linear drive mechanism and has a movable end that lifts vertically. The clamping mechanism is installed on the movable end of the lifting mechanism. The clamping mechanism has a clamping end for clamping the placement component, so that the placement component has a first position state of being clamped, and a second position state of being unclamped and placed in the reaction tank or the water washing tank.

3. The multi-stage leaching device for recovering precious metals from precious metal-containing materials according to claim 2, characterized in that: The storage component includes a mesh basket and a storage rack. The mesh basket is detachably mounted on the inner side of the storage rack. When the storage rack is in the second position, it is mounted on the reaction tank or the washing tank, and the mesh basket is immersed in the interior of the corresponding tank.

4. The multi-stage leaching device for recovering precious metals from precious metal-containing materials according to claim 3, characterized in that: The storage assembly also includes a rotation drive assembly. The mesh basket is rotationally connected to the storage rack. The driving end of the rotation drive assembly is transmission-connected to the rotating shaft of the mesh basket to drive the mesh basket to rotate.

5. A multi-stage leaching method for recovering precious metals from precious metal-containing materials, characterized in that: A multi-stage leaching device for recovering precious metals from precious metal-containing materials as claimed in any one of claims 1 to 4, wherein the specific method is as follows: The multi-stage reaction tanks are all equipped with reagent solutions of the same concentration. The precious metal-containing material is first leached in the first-stage reaction tank to dissolve the precious metal, then in the second-stage reaction tank to dissolve the precious metal, and then in the last-stage reaction tank in turn. During the leaching process, the target metal concentration in each stage of the reaction tank is tracked. If the metal concentration in the first stage of the reaction tank does not reach the target value, the precious metal-containing material is still sequentially leached in multiple stages of reaction tanks according to the number of stages. If the metal concentration in the first stage of the reaction tank reaches the target value, the next step is entered; If the metal concentration in the first-stage reaction tank reaches the target value, the precious metal solution in the first-stage reaction tank is drained to the next process flow, and at the same time, the other reaction tanks are adjusted up one level in turn, and a new final-stage reaction tank is configured.

6. The multi-stage leaching method for recovering precious metals from precious metal-containing materials according to claim 5, characterized in that: It also includes the following steps: After the precious metals are leached out in the multi-stage reaction tank, the precious metal-containing materials enter the multi-stage water washing tank. The precious metal-containing materials are first washed in the first-stage water washing tank, then washed in the second-stage water washing tank, and then washed in the last-stage water washing tank in sequence to dilute and wash the solution of the reaction tank carried by the materials.

7. The multi-stage leaching method for recovering precious metals from precious metal-containing materials according to claim 6, characterized in that: It also includes the following steps: If the metal concentration in the first-stage reaction tank reaches the target value, the precious metal solution in the first-stage reaction tank is drained to the next process flow, and at the same time, the other reaction tanks are adjusted up one level in turn, and the original first-stage reaction tank is configured as the new last-stage reaction tank.

8. The multi-stage leaching method for recovering precious metals from precious metal-containing materials according to claim 6, characterized in that: It also includes the following steps: If the metal concentration in the first-stage reaction tank reaches the target value, the precious metal solution in the first-stage reaction tank is drained to the next process flow, and at the same time, the other reaction tanks are adjusted up one level in turn, and the first-stage water washing tank is simultaneously added with reagents to configure it into a new last-stage reaction tank, and the original first-stage reaction tank is injected with washing water to adjust it to the last-stage water washing tank.

9. The multi-stage leaching method for recovering precious metals from precious metal-containing materials according to claim 6, characterized in that: It also includes the following steps: If the metal concentration in the first-stage reaction tank reaches the target value, the precious metal solution in the first-stage reaction tank is drained to the next process flow, and at the same time, the other reaction tanks are adjusted up one level in turn, and the first-stage water washing tank is simultaneously added with reagents to be configured as a new last-stage reaction tank; an idle transfer water washing tank is also arranged, and when the first-stage water washing tank is adjusted to the last-stage reaction tank, the transfer water washing tank is adjusted to the last-stage water washing tank, and the original first-stage reaction tank is injected with washing water to be adjusted to the transfer water washing tank.

10. The multi-stage leaching method for recovering precious metals from precious metal-containing materials according to claim 8 or 9, characterized in that: The reaction tank and the water washing tank both monitor the target metal concentration and the reagent concentration.

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