Novel implementation of precious metal ultrafine powder processing reaction device and method

Abstract

The present application relates to the technical field of metal powder preparation, and particularly relates to a novel reaction device and method for processing noble metal superfine powder. The present application comprises a support frame, a vortex rotating cylinder and an electric spark generator placed in a container, and a circulating channel for noble metal block dissolution and electric shock powder is formed between the vortex rotating cylinder under the action of the vortex rotating cylinder; the solution flow forms a vortex state by the propeller blades, and the fine powder uniformly precipitates to the bottom of the outer sleeve along with the vortex; the noble metal block is struck by an electric arc in the electric spark generator to form fine powder. The present application not only eliminates the dust caused by the electric arc, but also avoids the welding slag formed by high temperature; the reaction device not only improves the powdering efficiency, but also completely avoids the waste materials formed in the powdering process such as caking and welding slag, so that the standard powder particles in the finished product account for >99.9%, and the product quality is improved.

Description

Technical Field

[0001] This invention relates to the field of metal powder preparation technology, and specifically to a novel reaction apparatus and method for processing ultrafine precious metal powders. Background Technology

[0002] Currently, there are two main types of equipment for preparing metal powders using electrical discharge machining (EDM): rod-shaped devices and vibrating drum devices. However, rod-shaped devices have low powder preparation efficiency and cannot meet the needs of industrial production, generally being used for experimental research. Vibrating drum devices can improve production efficiency; however, when preparing ultrafine powders, the vibrating drum requires continuous shaking to allow the powder to pass through a filter screen located within the drum. This shaking process can easily cause poor electrode contact and electrode erosion, thus reducing the lifespan of the electrodes.

[0003] For example, Chinese patent CN114029000A discloses an electro-discharge powder preparation device with a rotating multi-ring curved surface electrode. This device replaces the traditional rod-shaped electrode with a ring-shaped electrode and utilizes the rotation of the ring electrode instead of traditional stirring. This application results in a larger reaction area, richer contact between the electrode and the bulk raw material, and a significantly increased probability of collisions between the blocks. However, this method suffers from low powdering efficiency, failing to form sufficiently fine powder. The powdering process may generate dust and welding slag, which not only affects product quality but may also pollute the environment. Furthermore, the equipment structure is not reasonable enough, posing safety hazards; operation is not simple enough; and the cost is high, limiting its practicality. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a novel reaction device and method for processing ultrafine precious metal powders.

[0005] The technical solution of this invention is as follows:

[0006] A novel reaction apparatus for processing ultrafine precious metal powders includes a support frame, a vortex rotating drum, and an electric spark generator placed in a container, wherein:

[0007] The support frame includes an upper support plate, a lower support plate that is spaced at a certain distance from the upper support plate and parallel to it, and several support columns connecting the upper support plate and the lower support plate.

[0008] The vortex drum includes an outer sleeve located at the bottom of the upper support plate, the outer sleeve has a built-in propeller blade, and the side of the outer sleeve has an opening;

[0009] An electric spark generator, comprising an arc-shaped positive electrode plate and an arc-shaped negative electrode plate located at the top of a lower support plate;

[0010] Under the action of the vortex rotating drum, a circulating channel is formed for the noble metal block to be dissolved and electro-powdered; the propeller blades make the solution flow into a vortex state, and the fine powder is evenly deposited to the bottom of the outer sleeve with the vortex; the noble metal block is formed into fine powder by electric arc in the electric spark generator.

[0011] This technical solution improves the powdering efficiency by modifying the reaction device. The reaction device mainly includes a support frame, a vortex rotating drum, and an electric spark generator. The support frame includes an upper support plate, a lower support plate, and several support columns. There is a certain distance between the upper and lower support plates, and they are parallel. The support columns connect the upper and lower support plates to form a stable support frame. The eddy current rotary drum includes an outer sleeve located at the bottom of the upper support plate, with propeller blades inside. Openings are provided on the side of the outer sleeve, allowing solution to enter and flow out from the bottom. The electric spark generator includes an arc-shaped positive electrode plate and an arc-shaped negative electrode plate located at the top of the lower support plate; these plates generate an electric arc when energized. Under the action of the eddy current rotary drum, a circulating channel is formed for the electrolytic grinding of precious metal blocks, filled with solution; that is, the entire electrolytic grinding process takes place in solution. The precious metal blocks are struck by the electric arc within the electric spark generator, forming fine powder. The propeller blades create a vortex flow in the solution, and the fine powder settles evenly to the bottom of the outer sleeve with the vortex, thus eliminating dust caused by the electric arc and avoiding welding slag formed at high temperatures. The reaction device not only improves grinding efficiency but also completely avoids agglomeration, welding slag, and other waste materials formed during the grinding process, resulting in a standard powder particle ratio of >99.9% in the finished product, improving product quality.

[0012] In some embodiments, a flange is provided at the top center of the support frame, and a drive bracket is connected to the flange. The upper end of the drive bracket is connected to a drive motor, and the lower end of the drive bracket is connected to a propeller blade inside the outer sleeve. The propeller blade rotates under the drive of the drive bracket, and the solution is drawn into the inner sleeve through the opening and settles evenly from the bottom of the outer sleeve, forming a vortex.

[0013] In some embodiments, the support frame is further provided with a feeding channel, which includes a feeding bin located at the top of the upper support frame and a feeding pipe parallel to the outer sleeve; the end of the feeding pipe is located above the electric spark generator, and the precious metal block falls into the electric spark generator to be struck and formed into fine powder.

[0014] In some embodiments, the cross-section of the upper support plate is larger than that of the lower support plate, and the edges extending from both sides of the upper support frame support the edge of the container.

[0015] In this technical solution, since the cross-section of the upper support plate is larger than that of the lower support plate, it can bear the weight and pressure of the entire reaction device and directly support the edge of the container, making the upper support frame more stable and ensuring the stable operation of the entire reaction device.

[0016] In some embodiments, the top of the lower support plate is provided with a bowl-shaped reaction tank, the middle of the reaction tank is provided with a partition, and an arc-shaped positive electrode plate and an arc-shaped negative electrode plate are respectively installed on both sides of the partition; when the arc-shaped positive electrode plate and the arc-shaped negative electrode plate are energized, an electric arc is generated, and the electric arc falls into the precious metal in the reaction tank and quickly strikes it to form fine powder.

[0017] In this technical solution, a partition is used to separate the arc-shaped positive electrode plate and the arc-shaped negative electrode plate to avoid short circuits; the energy generated by electric sparks is used to process precious metal blocks, which avoids the dust caused by electric arcs and the welding slag formed at high temperatures.

[0018] In some embodiments, the bottom of the lower support plate is provided with a limiting slot, and the bottom inner wall of the container is provided with a limiting block facing upwards. The limiting slot and the limiting block cooperate with each other to keep the support frame stationary.

[0019] In this technical solution, by setting limit slots and limit blocks, the movement of the support frame can be restricted, thereby ensuring safety during the processing.

[0020] In some embodiments, the sidewall of the container is provided with a jacket, which is connected to a coolant to remove the high temperature generated during the dissolution and electrolytic powdering process through circulation and cooling.

[0021] In some embodiments, the container is equipped with a discharge valve at the bottom to discharge the granular mixture with mixed solution in real time according to the pulverizing time, and then transfer it to the drying and pulverizing process.

[0022] In some embodiments, the container contains a solution in which the entire electrolytic ablation process takes place.

[0023] The technical solution of this invention is as follows:

[0024] A novel method for realizing a reaction apparatus for processing ultrafine precious metal powders includes the following steps:

[0025] S1: Place the reaction apparatus in a container filled with solution, and secure it firmly inside the container using the limiting slots; then, add the precious metal block to be crushed into the feed hopper and power on the reaction apparatus.

[0026] S2: After receiving the start signal, the precious metal block will fall into the electric spark generator through the feed pipe. The electric spark generator is energized, and the reaction tank generates an electric arc to strike the precious metal block, causing it to form fine powder. The entire dissolution and electro-powdering process is carried out in the solution, eliminating the dust caused by the electric arc.

[0027] S3: The propeller blades rotate at high speed under the drive of the drive bracket. At this time, the fine powder is synchronously drawn into the outer sleeve under the drive of the solution and evenly settles to the bottom of the outer sleeve, and so on.

[0028] S4: To ensure that the etched electro-powdering process always operates at a low temperature, a cooling liquid is circulated to cool the material and remove the generated heat in a timely manner. At the same time, the discharge valve is opened in real time to discharge the granular mixture containing the mixed solution, so that it can be transferred to the drying and powdering process later.

[0029] S5: After a certain period of repeated operation, the precious metal block will be transformed into ultrafine powder through the action of the solution. At this point, the power to the reaction device is cut off, and the entire operation process ends.

[0030] The reaction device of the present invention has significant advantages and practicality in the processing of precious metal ultrafine powders, providing new, efficient and environmentally friendly solutions for related industries.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] (1) The precious metal block is struck by the electric arc in the electric spark generator to form fine powder; the propeller blades make the solution flow into a vortex state, and the fine powder is evenly settled to the bottom of the outer sleeve with the vortex. This eliminates the dust caused by the electric arc and avoids the welding slag formed at high temperature. The reaction device not only improves the powdering efficiency, but also completely avoids the waste materials such as agglomerates and welding slag formed in the powdering process, so that the proportion of standard powder particles in the finished product is >99.9%, which improves the product quality.

[0033] (2) In addition, a high-speed propeller blade is designed on the upper part of the container. When working normally, the motor drives the propeller to rotate at high speed, so that the water flow inside the container forms a vortex state, and the fine powder of precious metals is evenly settled to the bottom of the outer cylinder along with the vortex, releasing the reaction space of the powdering electrode, and continuously adding block materials to form a continuous working state.

[0034] (3) Cooling is achieved by circulating coolant to remove the generated heat in time, thus maintaining the normal operation of the device and the quality of the product; the discharge valve is opened in real time to discharge the granular mixture with mixed solution, which is convenient for subsequent drying and powdering process.

[0035] (4) The overall design structure is reasonable, safe and reliable, easy to operate, low cost and highly practical, with good market prospects and application value. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is one of the structural schematic diagrams of the device of the present invention.

[0038] Figure 2 This is the second schematic diagram of the device of the present invention.

[0039] Figure 3 This is a flowchart illustrating the principle of the method of the present invention.

[0040] In the diagram: 1. Drive bracket; 2. Flange; 3. Upper support plate; 4. Support column; 5. Feed channel; 6. Outer sleeve; 7. Snap-fit ​​edge; 8. Lower support plate; 9. Opening; 10. Limiting slot; 11. Reaction tank. Detailed Implementation

[0041] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0042] Example 1

[0043] like Figure 1 and Figure 2 As shown, this embodiment provides a novel reaction apparatus for processing ultrafine precious metal powders, including a support frame, a vortex rotating drum, and an electric spark generator placed in a container, wherein:

[0044] The support frame includes an upper support plate 3, a lower support plate 8 that is spaced at a certain distance from and parallel to the upper support plate 3, and several support columns 4 connecting the upper support plate 3 and the lower support plate 8.

[0045] The vortex drum includes an outer sleeve 6 located at the bottom of the upper support plate 3. The outer sleeve 6 has a propeller blade inside and an opening 9 is provided on the side of the outer sleeve 6.

[0046] An electric spark generator includes an arc-shaped positive electrode plate and an arc-shaped negative electrode plate located at the top of the lower support plate 8;

[0047] Under the action of the vortex rotating drum, a circulation channel is formed for the noble metal block to be dissolved and electro-powdered; the propeller blades make the solution flow into a vortex state, and the fine powder is evenly deposited to the bottom of the outer sleeve 6 with the vortex; the noble metal block is formed into fine powder by electric arc in the electric spark generator.

[0048] like Figure 1 and Figure 2 As shown, this technical solution improves the powdering efficiency by modifying the reaction device. The reaction device mainly includes a support frame, a vortex rotating drum, and an electric spark generator. The support frame includes an upper support plate 3, a lower support plate 8, and several support columns 4. There is a certain distance between the upper support plate 3 and the lower support plate 8, and they are parallel. The support columns 4 connect the upper support plate 3 and the lower support plate 8 to form a stable support frame. The eddy current rotating drum includes an outer sleeve 6 located at the bottom of the upper support plate 3, with propeller blades inside the outer sleeve 6. An opening 9 is provided on the side of the outer sleeve 6, allowing the solution to enter and flow out from the bottom. The electric spark generator includes an arc-shaped positive electrode plate and an arc-shaped negative electrode plate located at the top of the lower support plate 8. These electrode plates generate an electric arc when energized. Under the action of the eddy current rotating drum, a circulating channel for dissolving and electro-powdering of precious metal blocks is formed, filled with solution; that is, the entire dissolution and electro-powdering process takes place in solution. The precious metal blocks are struck by the electric arc in the electric spark generator, forming fine powder. The propeller blades create a eddy current in the solution flow, and the fine powder settles evenly to the bottom of the outer sleeve 6 with the eddy current. This eliminates dust caused by the electric arc and avoids welding slag formed at high temperatures. The reaction device not only improves the powdering efficiency but also completely avoids agglomeration, welding slag, and other waste materials formed during the powdering process, resulting in a standard powder particle ratio of >99.9% in the finished product, thus improving product quality.

[0049] In some embodiments, a flange 2 is provided at the top center of the support frame, and a drive bracket 1 is connected to the flange 2. The upper end of the drive bracket 1 is connected to a drive motor, and the lower end of the drive bracket 1 is connected to a propeller blade inside the outer sleeve 6. The propeller blade rotates under the drive of the drive bracket 1, and the solution is drawn into the interior through the opening 9 of the outer sleeve 6 and settles evenly from the bottom of the outer sleeve 6, forming a vortex state.

[0050] In some embodiments, the support frame is further provided with a feeding channel 5, which includes a feeding bin located at the top of the upper support frame and a feeding pipe parallel to the outer sleeve 6; the end of the feeding pipe is located above the electric spark generator, and the precious metal block falls into the electric spark generator to be struck to form fine powder.

[0051] In some embodiments, the cross-section of the upper support plate 3 is larger than the cross-section of the lower support plate 8, and the edges extending from both sides of the upper support frame support the edge of the container.

[0052] In this technical solution, since the cross-section of the upper support plate 3 is larger than that of the lower support plate 8, it can bear the weight and pressure of the entire reaction device and directly support the edge of the container, making the upper support frame more stable and ensuring the stable operation of the entire reaction device.

[0053] In some embodiments, the top of the lower support plate 8 is provided with a bowl-shaped reaction tank 11, the middle of the reaction tank 11 is provided with a partition, and an arc-shaped positive electrode plate and an arc-shaped negative electrode plate are respectively installed on both sides of the partition; when the arc-shaped positive electrode plate and the arc-shaped negative electrode plate are energized, an electric arc is generated, and the electric arc falls into the reaction tank 11 and rapidly strikes the precious metal to form fine powder.

[0054] In this technical solution, a partition is used to separate the arc-shaped positive electrode plate and the arc-shaped negative electrode plate to avoid short circuits; the energy generated by electric sparks is used to process precious metal blocks, which avoids the dust caused by electric arcs and the welding slag formed at high temperatures.

[0055] In some embodiments, the bottom of the lower support plate 8 is provided with a limiting slot 10, and the bottom inner wall of the container is provided with a limiting block facing upwards. The limiting slot 10 and the limiting block cooperate with each other to keep the support frame stationary.

[0056] In this technical solution, by setting the limiting slot 10 and the limiting block, the movement of the support frame can be restricted, thereby ensuring safety during the processing.

[0057] In some embodiments, the sidewall of the container is provided with a jacket, which is connected to a coolant to remove the high temperature generated during the dissolution and electrolytic powdering process through circulation and cooling.

[0058] In some embodiments, the container is equipped with a discharge valve at the bottom to discharge the granular mixture with mixed solution in real time according to the pulverizing time, and then transfer it to the drying and pulverizing process.

[0059] In some embodiments, the container contains a solution in which the entire electrolytic ablation process takes place.

[0060] Example 2

[0061] like Figure 3 As shown, based on Example 1, this example provides a novel method for realizing a reaction apparatus for processing ultrafine precious metal powders, comprising the following steps:

[0062] S1: Place the reaction apparatus in a container filled with solution, and secure it firmly in the container by using the limiting slot 10; then, add the precious metal block to be crushed into the feed hopper and power on the reaction apparatus.

[0063] S2: After receiving the start signal, the precious metal block will fall into the electric spark generator through the feed pipe. The electric spark generator is powered on, and the reaction tank 11 generates an electric arc to strike the precious metal block, causing it to form fine powder. The entire dissolution and electro-powdering process is carried out in the solution, eliminating the dust caused by the electric arc.

[0064] S3: The propeller blades rotate at high speed under the drive of the drive bracket 1. At this time, the fine powder is synchronously drawn into the outer sleeve 6 under the drive of the solution and evenly settled to the bottom of the outer sleeve 6, and so on.

[0065] S4: To ensure that the etched electro-powdering process always operates at a low temperature, a cooling liquid is circulated to cool the material and remove the generated heat in a timely manner. At the same time, the discharge valve is opened in real time to discharge the granular mixture containing the mixed solution, so that it can be transferred to the drying and powdering process later.

[0066] S5: After a certain period of repeated operation, the precious metal block will be transformed into ultrafine powder through the action of the solution. At this point, the power to the reaction device is cut off, and the entire operation process ends.

[0067] The reaction device of the present invention has significant advantages and practicality in the processing of precious metal ultrafine powders, providing new, efficient and environmentally friendly solutions for related industries.

[0068] This reaction apparatus is a batch-production device for ultrafine powder preparation via electrical discharge machining (EDM). It includes a reaction mechanism comprising a reaction tank, an arc-shaped positive electrode plate, and an arc-shaped negative electrode plate. Both the arc-shaped positive and negative electrode plates are disposed within the reaction tank and adhere to its inner wall. The core of this apparatus involves the positive and negative electrodes and the grinding of precious metal blocks within a sealed container filled with a solution. This means the entire electrolytic grinding process takes place within the solution. This design eliminates dust generated by the electric arc and avoids the formation of welding slag at high temperatures. This apparatus not only improves grinding efficiency but also completely avoids agglomeration and welding slag during the grinding process, resulting in a finished product with a standard powder particle content >99.9%.

[0069] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the invention should also be covered within the protection scope of the invention. Therefore, the protection scope of the invention should be determined by the scope of the claims.

Claims

1. A novel reaction apparatus for processing ultrafine precious metal powders, characterized in that, Includes a support frame, a vortex rotary drum, and an electric spark generator housed within a container, wherein: The support frame includes an upper support plate (3), a lower support plate (8) that is spaced at a certain distance from the upper support plate (3) and parallel to it, and several support columns (4) connecting the upper support plate (3) and the lower support plate (8); The vortex drum includes an outer sleeve (6) located at the bottom of the upper support plate (3), the outer sleeve (6) has a propeller blade inside, and the side of the outer sleeve (6) has an opening (9); The electric spark generator includes an arc-shaped positive electrode plate and an arc-shaped negative electrode plate located on the top of the lower support plate (8); Under the action of the vortex rotating drum, a circulation channel is formed in between for the noble metal block to be dissolved and electro-powdered; the propeller blades make the solution flow into a vortex state, and the fine powder is uniformly deposited to the bottom of the outer sleeve (6) with the vortex; the noble metal block is formed into fine powder by electric arc in the electric spark generator; A flange (2) is provided at the top center of the support frame. The flange (2) is connected to a drive bracket (1). The upper end of the drive bracket (1) is connected to a drive motor, and the lower end of the drive bracket (1) is connected to the propeller blades inside the outer sleeve (6). The propeller blades rotate under the drive of the drive bracket (1), and the solution is drawn into the interior through the opening (9) of the outer sleeve (6) and settles evenly from the bottom of the outer sleeve (6) to form a vortex state. The support frame is also provided with a feeding channel (5), which includes a feeding bin located at the top of the upper support frame and a feeding pipe parallel to the outer sleeve (6); the end of the feeding pipe is located above the electric spark generator, and the precious metal block falls into the electric spark generator to be struck to form fine powder. The cross-section of the upper support plate (3) is larger than that of the lower support plate (8), and the edges extending from both sides of the upper support frame support the edge of the container. The top of the lower support plate (8) is provided with a bowl-shaped reaction tank (11), and a partition is provided in the middle of the reaction tank (11). An arc-shaped positive electrode plate and an arc-shaped negative electrode plate are respectively installed on both sides of the partition. When the arc-shaped positive electrode plate and the arc-shaped negative electrode plate are energized, an electric arc is generated. The electric arc strikes the precious metal block falling into the reaction tank (11) to form fine powder.

2. The novel reaction apparatus for processing ultrafine precious metal powder as described in claim 1, characterized in that, The bottom of the lower support plate (8) is provided with a limiting slot (10), and the bottom inner wall of the container is provided with a limiting block facing upward. The limiting slot (10) and the limiting block cooperate with each other to keep the support frame stationary.

3. The novel reaction apparatus for processing ultrafine precious metal powder as described in claim 2, characterized in that, The container has a jacket on its side wall, which is connected to a coolant. The coolant is circulated and cooled to remove the high temperature generated during the electrolytic powdering process.

4. The novel reaction apparatus for processing ultrafine precious metal powder as described in claim 3, characterized in that, The container is equipped with a discharge valve at the bottom, which discharges the granular mixture with mixed solution in real time according to the grinding time, and then transfers it to the drying and powdering process.

5. The novel reaction apparatus for processing ultrafine precious metal powder as described in claim 3 or 4, characterized in that, The container contains a solution, and the entire electrolytic dissolution process takes place within the solution.

6. A novel method for realizing the processing of ultrafine precious metal powders, employing the novel apparatus for realizing the processing of ultrafine precious metal powders as described in claim 5, characterized in that... Includes the following steps: S1: Place the reaction device in a container filled with solution, and secure it firmly in the container by using the limiting slot (10); then, add the precious metal block to be crushed into the feed hopper and power on the reaction device. S2: After receiving the start signal, the precious metal block will fall into the electric spark generator through the feed pipe. The electric spark generator is powered on, and the reaction tank (11) generates an electric arc to strike the precious metal block, making it into fine powder. The entire dissolution and electro-powdering process is carried out in the solution to eliminate the dust caused by the electric arc. S3: The propeller blades rotate at high speed under the drive of the drive bracket (1). At this time, the fine powder is synchronously sucked into the outer sleeve (6) under the drive of the solution and evenly settled to the bottom of the outer sleeve (6), and so on. S4: To ensure that the etched electro-powdering process always operates at a low temperature, a cooling liquid is circulated to cool the material and remove the generated heat in a timely manner. At the same time, the discharge valve is opened in real time to discharge the granular mixture containing the mixed solution, so that it can be transferred to the drying and powdering process later. S5: After a certain period of repeated operation, the precious metal block will be transformed into ultrafine powder through the action of the solution. At this point, the power to the reaction device is cut off, and the entire operation process ends.

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