A process and device for producing copper-clad iron powder

Abstract

A copper-clad iron powder, wherein copper accounts for 10%-40% of the total weight of the copper-clad iron powder, and the rest is iron. A production process for copper-clad iron powder, the steps include: 1. completely dissolving a certain amount of copper sulfate crystals in a liquid, then adjusting the pH value of the copper sulfate solution to 1.0-5.0, and adding a stabilizer to obtain a mixed solution; 2. adding iron powder to a reaction barrel, and continuously stirring using a stirring device until the replacement reaction is fully completed; 3. allowing the mixed solution to stand, filtering the mixed solution after removing the upper clear liquid, and rinsing the obtained filter cake with clean water until the pH is neutral 4. placing the rinsed filter cake in a reduction furnace at 300-800°C, passing a reducing gas, and obtaining a powder after sufficient reduction; 5. crushing and sieving the obtained powder according to the required size specifications, and packaging and storage. A production device for copper-clad iron powder, including: a frame, a reaction barrel, a motor, a stirring shaft, a fan, a pipeline, a middle opening and closing mechanism, and a reduction furnace.

Description

Technical Field

[0001] The present invention relates to the field of metal powder production and manufacturing, and specifically relates to copper-clad iron powder and a production process and device. Background Art

[0002] Copper powder and iron powder are indispensable raw materials in the current powder metallurgy field. They are widely used in the manufacture of friction materials and mechanical bearings. However, these single metal powders also have some significant deficiencies in practical applications. Among them, the most prominent problem is that their strength is relatively low. Due to the limited strength of copper powder and iron powder themselves, they tend to show low compression resistance and wear resistance when subjected to external forces such as pressure and wear, which not only affects the service life of the product, but may also cause safety hazards during use. For example, when manufacturing mechanical bearings, if the copper powder or iron powder used is not strong enough, the bearings may wear out quickly when running at high speed because they cannot withstand the huge pressure and friction, and may even cause bearing failure. This will not only affect the normal operation of the equipment, but may also pose a threat to production safety.

[0003] Therefore, the prior art has begun to develop from single metal powder to coated powder, alloy powder, etc. The invention with publication number CN110369730B discloses a production process for preparing copper-clad iron powder, which is to mix iron powder and copper oxide powder in proportion, and then coat them under high temperature to finally obtain copper-clad iron powder. However, this method has some shortcomings, that is, it cannot ensure that the copper powder and the iron powder are mixed evenly and fully contacted, and it is difficult for iron and copper to diffuse directly, so it is difficult to ensure the quality of the obtained product.

[0004] In this regard, the invention with publication number CN102051606B discloses a production process for preparing copper-clad iron powder by wet method, wherein the preparation process is to dissolve copper sulfate crystals into copper sulfate solution, add an appropriate amount of iron powder after reaching a certain concentration, and the iron powder will undergo a replacement reaction with the copper sulfate solution during stirring, and the copper ions will be replaced to become copper element and coated on the surface of the iron powder particles, and then the coated iron powder will be rinsed, dried, crushed and screened, and the powder obtained is copper-clad iron powder. However, this process has a defect, that is, the copper powder may come into contact with air during the process of coating the surface of the iron powder particles, and part of the copper element is oxidized by the air into copper oxide, which greatly reduces the actual effect of the copper-clad iron powder.

[0005] During the production process of copper-clad iron powder, it is particularly important to ensure that the replacement reaction is fully carried out. In order to facilitate the observation of the progress of the replacement reaction, many existing copper-clad iron powder production reaction devices adopt a lidless open design. However, the simple lidless design has a defect: it makes the reaction device susceptible to invasion by external impurities such as insects, thereby causing potential impact on the reaction process and product quality. Summary of the invention

[0006] The first object of the present invention is to provide a copper-clad iron powder which has low cost and simple raw materials, so as to solve the problem of low strength of single metal powders such as copper powder and iron powder during use.

[0007] The first object of the present invention is achieved as follows: a copper-clad iron powder, wherein copper accounts for 10%-40% of the total weight of the copper-clad iron powder, and the rest is iron. The copper-clad iron powder is a double-layer structure metal powder with iron as the core and copper as the outer layer.

[0008] The principles and beneficial effects are:

[0009] Taking advantage of the characteristics of copper and iron, copper is tightly coated on the outer layer of iron through a special process. Iron as the core provides the main strength basis, while the copper layer can play a certain strengthening role, and a good bonding interface is formed between copper and iron. The copper layer can share part of the external force, reduce the stress concentration on the iron core, avoid local excessive deformation, and thus improve the overall strength. According to experimental verification, the average tensile strength of copper products is 230Mpa, the average tensile strength of iron products is 300Mpa, and the average tensile strength of copper-clad iron products is 400Mpa. It can be seen that copper-clad iron exhibits higher strength performance than single copper or single iron, and can adapt to more complex and harsh use environments.

[0010] The second object of the present invention is to provide a production process for copper-clad iron powder, which has simple production process steps to solve the problem that copper powder is easily oxidized by air to become copper oxide in the wet preparation of copper-clad iron powder. The specific steps are as follows:

[0011] 1. Completely dissolve a certain amount of copper sulfate crystals in the liquid, then adjust the pH value of the copper sulfate solution to 1.0-5.0, and add a stabilizer to obtain a mixed solution;

[0012] 2. Rapidly add iron powder and continue stirring with a stirring device until the replacement reaction is fully completed;

[0013] 3. Allow the mixture to stand, remove the supernatant, filter the mixture and rinse the filter cake with water until the pH is neutral;

[0014] 4. Put the washed filter cake into a reduction furnace at 300-800℃, introduce reducing gas, and obtain powder after full reduction;

[0015] 5. The obtained powder is crushed and sieved according to the required size specifications, and then packaged and stored.

[0016] The principles and beneficial effects are:

[0017] According to the chemical replacement method, iron powder and copper sulfate solution will react chemically at a pH of 1.0-5.0 and under the action of a stabilizer. The iron powder will replace the copper ions in the copper sulfate, and the copper will be coated on the surface of the iron powder particles. The reaction formula is as follows: Fe+CuSO4=Cu+FeSO4. By controlling the reaction conditions, it is ensured that the copper ions can be effectively replaced and evenly deposited on the surface of the iron powder particles to form a copper layer. The mixed solution is allowed to stand, filtered and rinsed to effectively remove impurities such as ferrous sulfate that may remain. Copper is easily oxidized by air, so it is necessary to use reducing gas under high temperature conditions to reduce the small amount of copper oxide that may exist to copper, further ensuring the purity and integrity of the copper layer.

[0018] The third object of the present invention is to provide a production device for copper-clad iron powder to solve the problem that the copper-clad iron powder is easily disturbed by external impurities such as flying insects during stirring, which specifically includes:

[0019] frame;

[0020] A reaction barrel, wherein the reaction barrel is fixed on the frame;

[0021] The motor is fixed on the frame and located on the top of the reaction barrel;

[0022] A stirring shaft connected to the output shaft of the motor and perpendicular to the bottom surface of the reaction barrel;

[0023] A fan, wherein the fan is located below the motor and fixed on the stirring shaft;

[0024] A pipe connected to the stirring shaft, wrapping the stirring shaft from the top of the fan to above the stirring shaft blades, and the pipe is provided with a plurality of air inlet holes at the top of the fan;

[0025] The middle opening and closing mechanism comprises: a middle air outlet, a first sealing ball, and a first spring. The middle air outlet is arranged on the pipeline and is at the same level as the reaction barrel opening. The first sealing ball is used to seal the middle air outlet. One end of the first spring is connected to the stirring shaft, and the other end is connected to the first sealing ball.

[0026] A reduction furnace is connected to the reaction barrel.

[0027] The principles and beneficial effects are:

[0028] When working, first add copper sulfate crystals to the reaction barrel, and then add iron powder after the copper sulfate crystals are fully dissolved. When the iron powder is just added, the iron powder will react violently with the copper sulfate solution, and a large amount of gas will be discharged toward the mouth of the reaction barrel, so there is no need to worry about impurities such as flying insects entering. When the motor speed is increased and the stirring shaft is accelerated to promote the reaction, the first sealing ball in the middle opening and closing mechanism is affected by the centrifugal force and performs centrifugal motion. Due to the existence of the first spring, the first sealing ball gradually moves away from the stirring shaft and approaches the middle air outlet. Therefore, the first sealing ball in the middle opening and closing mechanism will eventually block the middle air outlet and prevent the gas from being discharged from the middle air outlet.

[0029] When the reaction between the iron powder and the copper sulfate solution is no longer intense and the generated gas is insufficient to prevent flying insects from entering the reaction barrel, the speed of the motor is reduced, which drives the speed of the rotating shaft to also reduce. Due to the reduction of centrifugal force, the first sealing ball of the middle opening and closing mechanism gradually approaches the stirring shaft and moves away from the middle air outlet under the pulling force of the first spring, so that the middle air outlet is unobstructed. Therefore, the gas inhaled into the pipeline from the air inlet by the fan can only be discharged from the middle air outlet. The gas discharged from several middle air outlets forms a wind curtain at the mouth of the reaction barrel, which effectively prevents the entry of impurities such as flying insects and ensures that the replacement reaction is not affected by the outside world.

[0030] At the beginning, the reaction is quite intense, generating a lot of heat, and a lot of gas escapes, which can prevent insects and other impurities from entering the reaction barrel. At this time, the middle air outlet cannot be opened, otherwise the gas discharged from the middle air outlet will form a wind curtain at the mouth of the reaction barrel, making it impossible to discharge the heat and gas generated by the reaction barrel, which is not conducive to the reaction. Therefore, the stirring shaft speed is accelerated, so that the first sealing ball blocks the middle air outlet to prevent the gas sucked by the fan from being discharged from the middle air outlet. When the reaction is no longer intense, the heat and gas generated are reduced. At this time, the stirring shaft speed is reduced, and the gas sucked by the fan is discharged from the middle air outlet. The wind curtain formed effectively prevents insects and other impurities from entering the reaction barrel. After the reaction is completed, the filter cake is placed in a reduction furnace for reduction reaction, and the oxidized copper is reduced to copper element by the action of high temperature and reducing gas. Through the above process and device, it can be ensured that the copper is evenly, tightly and firmly coated on the surface of the iron powder particles, and finally copper-coated iron powder is obtained.

[0031] Furthermore, the pH value in the reaction barrel is adjusted with dilute sulfuric acid.

[0032] Dilute sulfuric acid can not only adjust the pH value of the solution, but also corrode the oxides that may be contained on the surface of the iron powder, making the surface of the iron powder purer and allowing the replaced copper to be coated on the surface of the iron powder more evenly and quickly.

[0033] Furthermore, the stabilizer is sodium acetate and polyethylene glycol, and the concentration is 0.1-10 g / L.

[0034] The above operation can significantly improve the stability of the reaction system. Sodium acetate can form a complex with the ions in the solution, reduce the activity of the ions, thereby slowing down the reaction rate and preventing instability caused by excessive reaction. Polyethylene glycol can further stabilize the solution system by forming a protective film in the solution to reduce the interaction between the solute and the solvent. The addition of these stabilizers helps to ensure that the replacement reaction is carried out under stable and controllable conditions, thereby improving the efficiency of the reaction and the purity of the product.

[0035] Furthermore, the specific steps of the reduction coating are as follows: first heat up to T1, keep warm for 20min to 40min; then heat up to T2, keep warm for 40min to 90min, and finally cool; 390℃≤T1≤410℃; 590℃≤T2≤610℃.

[0036] Through the design of step heating, in a reducing atmosphere, the copper oxide powder oxidized by air at T1 is first reduced to highly active copper, and at T2, the highly active copper is tightly coated on the surface of the iron powder particles, making the copper-clad iron powder more tightly and comprehensively coated.

[0037] Furthermore, the reaction barrel is fixed on the frame at an angle.

[0038] Since the reaction barrel is fixed on the rack at an angle, more space is saved compared to vertical placement, and the tilt angle can be adjusted according to actual conditions. It is not restricted by the height of the storage site, which improves the adaptability of the equipment.

[0039] Furthermore, a bottom opening and closing mechanism is provided at the bottom of the stirring shaft, including: a bottom air outlet, a second sealing ball and a second spring. The bottom air outlet is provided on the pipe above the stirring shaft blades. The second sealing ball is located outside the bottom air outlet and is used to seal the bottom air outlet. One end of the second spring is connected to the stirring shaft, and the other end extends to the outside of the bottom air outlet and is connected to the second sealing ball.

[0040] At the beginning, the reaction is intense, generating a lot of heat, and a lot of gas escapes, which can prevent insects and other impurities from entering the reaction barrel. At this time, the middle air outlet cannot be opened, otherwise the gas discharged from the middle air outlet will form a wind curtain at the mouth of the reaction barrel, making it impossible to discharge the heat and gas generated by the reaction barrel, which is not conducive to the reaction. Therefore, the stirring shaft speed is accelerated, so that the first sealing ball blocks the middle air outlet, preventing the gas sucked by the fan from being discharged from the middle air outlet. The second sealing ball in the bottom opening and closing mechanism is located outside the bottom air outlet. When the stirring shaft speed is fast, the second sealing ball moves centrifugally away from the bottom air outlet under the action of the second spring, so that the bottom air outlet is unobstructed and the gas is allowed to be discharged from the bottom air outlet. Therefore, the gas sucked into the pipeline by the fan from the air intake hole can only be discharged from the bottom air outlet. Since the bottom air outlet is immersed in the solution, the discharged gas escapes in the form of bubbles, further driving the flow of the solution and making the reaction more sufficient.

[0041] When the reaction is no longer intense, the heat and gas generated decrease. At this time, the speed of the stirring shaft is reduced, which also drives the speed of the rotating shaft to decrease. The first sealing ball of the middle opening and closing mechanism gradually approaches the stirring shaft and moves away from the middle air outlet due to the reduced centrifugal force under the pulling force of the first spring, so that the middle air outlet is unobstructed. The second sealing ball of the bottom opening and closing mechanism is blocked by the pulling force of the second spring after the centrifugal force is reduced. Therefore, the gas in the fan inhaled pipe can only be discharged from the middle air outlet. The formed wind curtain effectively prevents insects and other impurities from entering the reaction barrel, ensuring that the replacement reaction is not affected by the outside world.

[0042] Furthermore, the middle opening and closing mechanism also includes a guide tube, which connects the stirring shaft and the middle air outlet and has a hollow surface, and the first sealing ball is slidably disposed in the guide tube.

[0043] By adopting the above operation, the first sealing ball can only perform centrifugal movement in the guide tube under the action of the guide tube and the first spring, ensuring that when the stirring shaft rotates, the first sealing ball can slide in the guide tube according to a predetermined path, thereby achieving precise control of the opening and closing of the middle air outlet.

[0044] Furthermore, a liquid level sensor is provided on the inner wall of the reaction barrel, and the liquid level sensor is connected to the motor through an electrical signal.

[0045] With the above operation, the liquid level of the solution drops due to the reaction process. When the liquid level sensor located on the inner wall of the reaction barrel senses that the liquid level has dropped to the set threshold, the speed of the motor is immediately reduced, driving the speed of the rotating shaft to also decrease, thereby closing the bottom opening and closing mechanism and opening the middle opening and closing mechanism, so that the gas discharge path and timing can be more accurately controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 Schematic diagram of the reaction device.

[0047] Figure 2 This is an enlarged view of the middle opening and closing mechanism when it is closed.

[0048] Figure 3 This is an enlarged view of the middle opening and closing mechanism when it is opened.

[0049] Figure 4 This is an enlarged view of the bottom opening and closing mechanism when it is closed.

[0050] Figure 5 This is an enlarged view of the bottom opening and closing mechanism when it is open.

[0051] The following is a further detailed description through specific implementation methods:

[0052] The figure marks in the drawings of the specification include: motor 1, stirring shaft 2, fan 4, pipeline 5, reaction barrel 7, liquid level sensor 8, middle opening and closing mechanism 6, bottom opening and closing mechanism 9, guide tube 10, first sealing ball 11, first spring 12, second sealing ball 13, second spring 14. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] Example 1

[0055] See also Figure 1 The present invention provides a solution: a copper-clad iron powder and a production process and a device, the device comprising:

[0056] A rack (not shown), the rack being placed on the ground;

[0057] Motor 1, which is a programmable motor and is welded and fixed on the frame;

[0058] A stirring shaft 2 is connected to an output shaft of the motor 1;

[0059] A fan 4 is fixed on the stirring shaft 2 below the motor 1;

[0060] Pipe 5, pipe 5 is welded and fixed on the stirring shaft 2, wrapping the stirring shaft 2 from the top of the fan 4 to the top of the stirring shaft blades, the pipe 5 is a combination of a rectangular parallelepiped and an inverted triangular pyramid at the fan (to better gather the airflow and transport it to the bottom), and a plurality of air intake holes 3 are provided on the top of the fan 4 of the pipe 5;

[0061] A reaction barrel 7, wherein the reaction barrel 7 is welded and fixed on the frame, and the bottom surface of the reaction barrel 7 is perpendicular to the stirring shaft 2. A liquid level sensor 8 is provided on the inner wall of the reaction barrel 7 for judging the height of the liquid level. The liquid level sensor is a pressure sensor. When working, since the liquid level fluctuates up and down, the average value of the sensed liquid level pressure is used as a standard value;

[0062] The middle opening and closing mechanism 6 comprises: a middle air outlet, a guide tube 10, a first sealing ball 11, and a first spring 12. The middle air outlet is arranged on the pipeline and is in the same plane as the reaction barrel opening. The guide tube 10 connects the stirring shaft 2 and the middle air outlet. The first sealing ball 11 is located in the guide tube 10. A rubber ring is provided on the surface of the first sealing ball. When the first sealing ball is close to the middle air outlet, the middle air outlet can be blocked. The first spring 12 is also located in the guide tube 10. One end of the first spring 12 is connected to the stirring shaft 2, and the other end is connected to the first sealing ball 11.

[0063] The bottom opening and closing mechanism 9 includes: a bottom air outlet, a second sealing ball 13, and a second spring 14. The bottom air outlet is provided on a pipe above the stirring shaft blade. The second sealing ball 13 is located outside the bottom air outlet. The second sealing ball also has a rubber ring on its surface. When the second sealing ball is close to the bottom air outlet, the bottom air outlet can be blocked. One end of the second spring 14 is connected to the stirring shaft 2, and the other end extends to the outside of the bottom air outlet and is connected to the second sealing ball 13.

[0064] A filter barrel (not shown), wherein a filter screen is provided in the middle of the filter barrel for filtering the solution after the reaction is completed, and a flushing pipe is provided on the top of the filter barrel, which is connected to an external water supply pipe for flushing the copper-clad iron powder left on the filter screen;

[0065] A reduction furnace (not shown), the head end of which is connected to the bottom of the filter barrel through a pipeline, a heater is provided in the reduction furnace to provide a sufficient temperature for the reduction reaction, and a gas supply pipe is also provided in the reduction furnace to fill the reduction furnace with a reduction protection gas;

[0066] A pulverizer (not shown) is used to pulverize the copper-clad iron powder filter cake;

[0067] A screening machine (not shown), in which a multi-layer screen is provided, for screening the crushed copper-clad iron powder into a desired particle size;

[0068] The reaction barrel, the filtering barrel, the reduction furnace, the crusher and the screening machine are connected in sequence.

[0069] When working, the operator prepares two groups of copper sulfate and iron powder for production, in which the mass ratio of copper and iron is: ① 10% copper and the rest is iron. ② 40% copper and the rest is iron. The following are the specific steps:

[0070] First, dissolve copper sulfate in water, add dilute sulfuric acid to adjust the pH value to about 3, add sodium acetate stabilizer with a concentration of 10g / L to obtain a mixed solution, and then quickly add iron powder, and then start the motor 1 to rotate continuously at a speed of 2000r / min. The fan 4 fixed on the stirring shaft 2 also rotates accordingly. The fan 4 sucks air through the air intake hole 3 on the pipe 5 and then blows it to the connected pipe. At this time, due to the high rotation speed of the stirring shaft 2, the first sealing ball 11 in the middle opening and closing mechanism 6 is affected by the centrifugal force and performs centrifugal motion. Due to the existence of the guide tube 10 and the first spring 12, the first sealing ball 11 can only perform centrifugal motion in the guide tube 10 away from the stirring shaft 2 and close to the middle air outlet. Because there is a layer of rubber ring on the surface of the first sealing ball 11, the first sealing ball 11 in the middle opening and closing mechanism 6 will eventually block the middle air outlet and prevent the gas from being discharged from the middle air outlet. Figure 2 The second sealing ball 13 in the bottom opening and closing mechanism 9 is located outside the bottom air outlet. The second sealing ball 13 moves centrifugally away from the bottom air outlet under the action of the second spring 14, so that the bottom air outlet is unobstructed and the gas is allowed to be discharged from the bottom air outlet. Therefore, the gas sucked into the pipe 5 by the fan 4 through the air intake hole 3 can only be discharged from the bottom air outlet. Figure 5 As shown. Since the bottom vent is immersed in the solution, the exhausted gas escapes in the form of bubbles, further driving the flow of the solution and making the reaction more complete.

[0071] At this time, due to the violent reaction between the newly added iron powder and the solution, a large amount of gas and heat are produced and discharged toward the mouth of the reaction barrel, which can prevent insects and other impurities from entering the reaction barrel. At this time, the middle air outlet cannot be opened, otherwise the gas discharged from the middle air outlet will form a wind curtain at the mouth of the reaction barrel, making it impossible for the heat and gas generated by the reaction barrel to be discharged, which is not conducive to the reaction. When the reaction is no longer intense, the heat and gas generated decrease, and the solution level drops due to the reaction process. After the liquid level sensor 8 located on the inner wall of the reaction barrel 7 senses that the liquid level has dropped to the set threshold, the controller immediately reduces the speed of the motor 1 to 500r / min, and the speed of the rotating shaft 2 is also reduced. Due to the reduction of centrifugal force, the first sealing ball 11 of the middle opening and closing mechanism 6 gradually approaches the stirring shaft 2 and moves away from the middle air outlet under the pulling force of the first spring 12, so that the middle air outlet is unobstructed. Figure 3 After the centrifugal force on the second sealing ball 13 of the bottom opening and closing mechanism 9 is reduced, the bottom air outlet is blocked under the pulling force of the second spring 14, as shown in FIG. Figure 4 Therefore, the gas sucked into the pipe 5 by the fan 4 can only be discharged from the middle air outlet, and the gas discharged from several middle air outlets forms a wind curtain at the mouth of the reaction barrel 7, effectively preventing the entry of impurities such as flying insects, and ensuring that the replacement reaction is not affected by the outside world.

[0072] After the replacement reaction is fully completed, the mixed solution is allowed to stand, the upper clear liquid is poured off, and the mixed solution is filtered using a filter bucket and the obtained filter cake is rinsed with clean water until the pH is neutral; the rinsed filter cake is placed in a reduction furnace, and the reducing gas hydrogen is introduced, and the temperature is first raised to 400°C and kept warm for 30 minutes. At this time, the copper oxide powder oxidized by the air is first reduced to highly active copper, and then the temperature is raised to 600°C and kept warm for 60 minutes, so that the highly active copper is tightly coated on the surface of the iron powder particles, so that the copper-clad iron powder is coated more tightly and comprehensively. After sufficient reaction, it is cooled to obtain copper-clad iron powder, and then the obtained powder is put into a pulverizer for crushing and a sieving machine for sieving according to the required size specifications, and finally packaged and stored to obtain the required copper-clad iron powder. After obtaining two groups of copper-clad iron powders with different mass ratios, these two groups of copper-clad iron powders are used to make bearing samples as the implementation group, and then elemental copper and elemental iron are used to make bearing samples in the same way as the control group, which are:

[0073] Implementation group 1: 10% by mass is copper, the rest is iron;

[0074] Implementation group 2: 40% by mass is copper, the rest is iron;

[0075] Control group 1: elemental copper;

[0076] Control group 2: elemental iron.

[0077] The four groups of samples were tested for strength, hardness, etc., and the results are shown in Table 1:

[0078] Table 1: Four groups of sample index test table

[0079]

[0080] As can be seen from Table 1, the strength, hardness and corrosion resistance of the control group are not as good as those of the implementation group. This proves that the products of copper-clad iron powder, in which copper accounts for 10%-40% of the total mass and the rest is iron, have greatly improved strength, hardness, etc. compared with the products of single copper and single iron.

[0081] Example 2

[0082] Compared with Example 1, the only difference is that the reaction barrel 7 is fixed on the frame at an angle. Since the reaction barrel 7 is fixed on the frame at an angle, more space is saved compared to vertical placement, and the inclination angle can be adjusted according to actual conditions, and is not limited by the height of the storage site, thereby improving the adaptability of the equipment.

Claims

1. A production device for copper-clad iron powder, comprising: frame; A reaction barrel, wherein the reaction barrel is fixed on the frame; The motor is fixed on the frame and located on the top of the reaction barrel; A stirring shaft connected to the output shaft of the motor and perpendicular to the bottom surface of the reaction barrel; A fan, wherein the fan is located below the motor and fixed on the stirring shaft; A pipe connected to the stirring shaft, wrapping the stirring shaft from the top of the fan to above the stirring shaft blades, and the pipe is provided with a plurality of air inlet holes at the top of the fan; The middle opening and closing mechanism comprises: a middle air outlet, a first sealing ball, and a first spring. The middle air outlet is arranged on the pipeline and is at the same level as the reaction barrel opening. The first sealing ball is used to seal the middle air outlet. One end of the first spring is connected to the stirring shaft, and the other end is connected to the first sealing ball. A reduction furnace is connected to the reaction barrel.

2. The production device of copper-clad iron powder according to claim 1, characterized in that: The reaction barrel is fixed on the rack at an angle.

3. The production device of copper-clad iron powder according to claim 1, characterized in that: A bottom opening and closing mechanism is provided at the bottom of the stirring shaft, including: a bottom air outlet, a second sealing ball and a second spring. The bottom air outlet is provided on the pipe above the stirring shaft blades. The second sealing ball is located outside the bottom air outlet and is used to seal the bottom air outlet. One end of the second spring is connected to the stirring shaft, and the other end extends to the outside of the bottom air outlet and is connected to the second sealing ball.

4. The production device of copper-clad iron powder according to claim 1, characterized in that: The middle opening and closing mechanism also includes a guide tube, which is connected to the stirring shaft and the middle air outlet and has a hollow surface. The first sealing ball is slidably arranged in the guide tube.

5. The production device of copper-clad iron powder according to claim 1, characterized in that: A liquid level sensor is arranged on the inner wall of the reaction barrel, and the liquid level sensor is connected to the motor through an electrical signal.

6. A process for producing copper-clad iron powder using the copper-clad iron powder production device according to any one of claims 1 to 5, characterized in that: The specific steps are as follows: (1) completely dissolving the copper sulfate crystals in the water in the reaction tank, then adjusting the pH value of the copper sulfate solution to 1.0-5.0, and adding a stabilizer to obtain a mixed solution; (2) Add iron powder to the reaction barrel and continue stirring using a stirring device until the replacement reaction is fully completed; (3) Allow the mixture to stand, remove the supernatant, filter the mixture, and rinse the resulting filter cake with clean water until the pH is neutral; (4) Place the washed filter cake into a reduction furnace at 300-800°C, introduce reducing gas, and obtain powder after full reduction; (5) The obtained powder is crushed and sieved according to the required size specifications, and then packaged and stored.

7. The copper-clad iron powder production process according to claim 6, characterized in that: The pH value in the reaction barrel is adjusted with dilute sulfuric acid.

8. The copper-clad iron powder production process according to claim 6, characterized in that: The stabilizers are sodium acetate and polyethylene glycol, and the concentration is 0.1-10 g / L.

9. The copper-clad iron powder production process according to claim 6, characterized in that: The specific steps of reduction are as follows: firstly, heating to T1, keeping warm for 20min to 40min; then heating to T2, keeping warm for 40min to 90min, and finally cooling; 390℃≤T1≤410℃; 590℃≤T2≤610℃.

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