An ultrasonic powder washing device for chlorine-free and fluorine-free pickling of doped tungsten powder

Abstract

The utility model discloses a kind of for doping tungsten powder chlorine-free fluorine ion pickling ultrasonic powder washing device, it is related to tungsten powder processing technical field, including powder washing box, the inner chamber of powder washing box is fixedly installed with conical powder washing cylinder, the front side of powder washing box is hingedly provided with access door, the left side of powder washing box is provided with discharge mechanism, the lower portion of discharge mechanism is provided with material receiving mechanism, the bottom of conical powder washing cylinder is fixedly connected with bottom box.The utility model through the cooperation between conical powder washing cylinder, three groups of piezoelectric ceramic transducer, air pump, gas pipe, gas outlet spray head, to cover agglomeration breakage, acid liquid penetration, complex stripping whole process in ultrasonic powder washing process, while it can form forced convection in cylinder, avoid tungsten powder settlement, finally reduce powder dispersion uniformity, improve impurity desorption rate, and can reduce pickling time, improve pickling efficiency.

Description

Technical Field

[0001] This utility model relates to the field of tungsten powder processing technology, specifically to an ultrasonic powder washing device for chlorine-fluoride ion-free acid washing of doped tungsten powder. Background Technology

[0002] In the pickling process of tungsten-doped powder, the traditional method uses a mixture of hydrochloric acid and hydrofluoric acid to remove residual dopants such as silicon, aluminum, and potassium. However, because the pickling wastewater contains high concentrations of fluoride and chloride ions, complex treatment is required to meet emission standards; otherwise, there is a risk of exceeding emission limits. Furthermore, hydrofluoric acid is highly corrosive and toxic, posing a threat to operator safety. Strong acids can easily cause excessive corrosion of the tungsten powder surface, resulting in particle size distribution shifts or abnormal bulk density, affecting the yield of subsequent cold isostatic pressing. Therefore, a chlorine- and fluorine-free organic acid pickling process is needed, including systems using citric acid, oxalic acid, and dilute sulfuric acid. Since organic acids have weaker complexing abilities than hydrofluoric acid, ultrasonic assistance is required to enhance impurity desorption efficiency. The existing technology has the following problems:

[0003] Because existing ultrasonic cleaning devices have limited dispersion effect on high-density tungsten powder, the powder is prone to deposit at the bottom of the tank, resulting in uneven distribution of ultrasonic energy and low desorption rate of impurities in some areas. At the same time, the residual complexes or hydroxyl groups on the surface of tungsten powder after organic acid washing increase the friction between particles, which easily leads to uneven pressure distribution during cold isostatic pressing, causing delamination or cracks in the billet. Utility Model Content

[0004] This invention provides an ultrasonic powder washing device for chlorine-fluoride ion-free acid washing of tungsten-doped powder, in order to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] An ultrasonic powder washing device for chlorine-fluoride ion-free acid washing of tungsten-doped powder includes a powder washing chamber. A conical powder washing cylinder is fixedly installed inside the chamber. An inspection door is hinged to the front of the chamber. A discharge mechanism is located on the left side of the chamber, and a receiving mechanism is located below the discharge mechanism. A bottom box is fixedly connected to the bottom of the conical powder washing cylinder. A first piezoelectric ceramic vibrator and a second piezoelectric ceramic vibrator are fixedly installed on the outer wall of the conical powder washing cylinder, with the first piezoelectric ceramic vibrator positioned above the second piezoelectric ceramic vibrator. A third piezoelectric ceramic vibrator is fixedly installed at the bottom of the base box. An air pump is fixedly installed in the inner cavity of the powder washing box. The input end of the air pump extends through to the right side of the powder washing box and is fixedly connected to a nitrogen input pipe. The output end of the nitrogen input pipe is fixedly connected to two gas supply pipes. The other ends of the two gas supply pipes are fixedly connected to air outlet boxes. The side of each air outlet box away from the gas supply pipe extends through to the inner cavity of the conical powder washing cylinder and is fixedly connected to several air outlet nozzles. The two air outlet boxes face each other and are located on the front and rear sides of the inner cavity of the conical powder washing cylinder, respectively.

[0007] A further improvement of this utility model is that: a discharge pipe that passes through the inner cavity is fixedly connected to the left side of the bottom box, the discharge pipe is inclined at 30 degrees, and an electric control valve is provided on the outer wall of the discharge pipe.

[0008] A further improvement of the present invention is that: a box cover is hinged to the top of the powder washing box, and a powder washing cylinder clamping plate is fixedly installed at the bottom of the box cover, and the powder washing cylinder clamping plate is engaged with the top of the inner cavity of the conical powder washing cylinder.

[0009] A further improvement of the present invention is that the discharge mechanism includes a base plate and a discharge pipe. The base plate is located above the discharge pipe. A stearic acid ethanol solution tank and an infusion pump are fixedly installed on the top of the base plate. The stearic acid ethanol solution tank is located in front of the infusion pump. A covered inlet port is fixedly connected to the top of the stearic acid ethanol solution tank, penetrating its inner cavity. The input end of the infusion pump extends to the bottom of the inner cavity of the stearic acid ethanol solution tank.

[0010] A further improvement of this utility model is that: the feeding pipe and the discharge pipe are connected and fixedly connected at the ends away from the bottom box; an annular infusion box is fixedly installed on the outer wall of the feeding pipe; an infusion pipe communicating with the inner cavity of the annular infusion box is fixedly connected to the output end of the infusion pump; and a plurality of atomizing nozzles are fixedly connected in an annular array on the inner ring of the annular infusion box, and all of the plurality of atomizing nozzles penetrate into the inner cavity of the feeding pipe.

[0011] A further improvement of the present invention is that the receiving mechanism includes a placement base, which is fixedly installed on the lower left side of the powder washing box. A slot is provided on the top of the placement base, and a receiving box is engaged inside the slot. The receiving box is located below the discharge pipe.

[0012] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0013] This invention provides an ultrasonic powder washing device for chlorine-fluoride ion-free acid washing of tungsten powder. Through the cooperation of a conical powder washing cylinder, three sets of piezoelectric ceramic transducers, an air pump, an air supply pipe, and an air outlet nozzle, the ultrasonic powder washing process can cover the entire process of agglomeration and breakup, acid penetration, and complex removal. At the same time, forced convection can be formed in the cylinder to avoid tungsten powder sedimentation, thereby reducing the uniformity of powder dispersion, improving the impurity desorption rate, reducing acid washing time, and improving acid washing efficiency.

[0014] This invention provides an ultrasonic powder washing device for chlorine-fluoride ion-free acid washing of tungsten powder. The device sprays a 0.1% stearic acid coating film onto the powder flowing out of the feed pipe through an atomizing nozzle in a stearic acid ethanol solution tank. This modifies the powder surface, increases the contact angle of the powder surface, reduces the friction coefficient between particles, and ensures the uniformity of pressure distribution during cold isostatic pressing of tungsten powder. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the internal cavity of the powder washing box of this utility model;

[0017] Figure 3 This is a cross-sectional schematic diagram of the conical powder washing cylinder and the bottom box of this utility model;

[0018] Figure 4 This is a schematic diagram of the material discharge mechanism and the material receiving mechanism of this utility model.

[0019] Figure 5 This is a schematic diagram of the feed tube of this utility model.

[0020] In the diagram: 1. Washing powder box; 11. Box cover; 111. Washing powder cylinder retaining plate; 12. Air pump; 121. Nitrogen input pipe; 122. Gas supply pipe; 123. Gas outlet box; 124. Gas outlet nozzle; 2. Conical washing powder cylinder; 21. Base box; 22. Discharge pipe; 23. Electrically controlled valve; 24. First piezoelectric ceramic vibrator; 25. Second piezoelectric ceramic vibrator; 26. Third piezoelectric ceramic vibrator; 3. Inspection door; 4. Discharge mechanism; 41. Base plate; 42. Stearic acid ethanol solution tank; 43. Covered liquid inlet; 44. Liquid pump; 441. Liquid supply pipe; 45. Discharge pipe; 451. Annular liquid supply box; 452. Atomizing nozzle; 5. Receiving mechanism; 51. Placement base; 52. Slot; 53. Receiving box. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand

[0022] Understood. The present invention will now be further described in conjunction with specific implementation methods.

[0023] like Figure 1 , Figure 2 As shown, this utility model provides an ultrasonic powder washing device for chlorine-fluoride ion-free acid washing of tungsten powder, including a powder washing box 1, a conical powder washing cylinder 2 fixedly installed in the inner cavity of the powder washing box 1, an inspection door 3 hinged to the front side of the powder washing box 1 for easy maintenance of the internal equipment, a discharge mechanism 4 on the left side of the powder washing box 1, a receiving mechanism 5 below the discharge mechanism 4, a bottom box 21 fixedly connected to the bottom of the conical powder washing cylinder 2, a discharge pipe 22 penetrating its inner cavity fixedly connected to the left side of the bottom box 21, the discharge pipe 22 inclined at 30 degrees, an electric control valve 23 on the outer wall of the discharge pipe 22, a box cover 11 hinged to the top of the powder washing box 1, a powder washing cylinder clamping plate 111 fixedly installed at the bottom of the box cover 11, and the powder washing cylinder clamping plate 111 engaging with the top of the inner cavity of the conical powder washing cylinder 2;

[0024] In use, tungsten powder mixed with organic acid is poured into the inner cavity of the conical powder washing cylinder 2 after opening the box cover 11. Then, the box cover 11 is closed, and the rubber powder washing cylinder clamp 111 is inserted into the inner cavity of the conical powder washing cylinder 2 to prevent the powder from being sprayed out during the washing process. After the powder washing is completed, the washed tungsten powder can be discharged by opening the electric control valve 23, which, together with the ultrasonic vibration of the conical powder washing cylinder 2 and the bottom box 21 and the 30-degree inclination of the discharge pipe 22.

[0025] like Figure 3As shown, a first piezoelectric ceramic vibrator 24 and a second piezoelectric ceramic vibrator 25 are fixedly installed on the outer wall of the conical powder washing cylinder 2. The first piezoelectric ceramic vibrator 24 is located above the second piezoelectric ceramic vibrator 25. A third piezoelectric ceramic vibrator 26 is fixedly installed at the bottom of the bottom box 21. An air pump 12 is fixedly installed in the inner cavity of the powder washing box 1. The input end of the air pump 12 extends through to the right side of the powder washing box 1 and is fixedly connected to a nitrogen input pipe 121. The output end of the nitrogen input pipe 121 is fixedly connected to two gas supply pipes 122. The other end of each of the two gas supply pipes 122 is fixedly connected to an air outlet box 123. The side of each of the two air outlet boxes 123 away from the gas supply pipes 122 extends through to the inner cavity of the conical powder washing cylinder 2 and is fixedly connected to several air outlet nozzles 124. The two air outlet boxes 123 face each other and are located on the front and rear sides of the inner cavity of the conical powder washing cylinder 2, respectively.

[0026] During powder washing, the first piezoelectric ceramic vibrator 24, the second piezoelectric ceramic vibrator 25, and the third piezoelectric ceramic vibrator 26 can be activated by an external power supply. The first piezoelectric ceramic vibrator 24 operates at a low frequency of 20kHz, mainly targeting the breakup of agglomerates. The second piezoelectric ceramic vibrator 25 operates at a medium frequency of 30kHz, which can enhance acid penetration. The third piezoelectric ceramic vibrator 26 operates at a high frequency of 40kHz, which can peel off surface complexes and cover the entire movement trajectory of the powder. In addition, during the ultrasonic powder washing process, nitrogen can be connected to the nitrogen input pipe 121 and the nitrogen can be injected into the two air outlet boxes 123 inside the conical powder washing cylinder 2 through the two air supply pipes 122 by starting the air pump 12. The nitrogen is then blown out from several air outlet nozzles 124. Since the two air outlet boxes 123 face opposite directions, they form a swirling flow field in conjunction with the nitrogen flow tangentially introduced through the side wall, which forcibly suspends the high-density tungsten powder and avoids the attenuation of ultrasonic energy caused by sedimentation.

[0027] like Figure 4 , Figure 5As shown, the discharge mechanism 4 includes a base plate 41 and a discharge pipe 45. The base plate 41 is located above the discharge pipe 45. A stearic acid ethanol solution tank 42 and an infusion pump 44 are fixedly installed on the top of the base plate 41. The stearic acid ethanol solution tank 42 is located in front of the infusion pump 44. A covered inlet 43 penetrating its inner cavity is fixedly connected to the top of the stearic acid ethanol solution tank 42. The input end of the infusion pump 44 extends to the bottom of the inner cavity of the stearic acid ethanol solution tank 42. The discharge pipe 45 is fixedly connected to the end of the discharge pipe 22 away from the bottom box 21. The outer wall of the discharge pipe 45 is fixedly installed with... There is an annular infusion box 451. The output end of the infusion pump 44 is fixedly connected to an infusion tube 441 that communicates with the inner cavity of the annular infusion box 451. Several atomizing nozzles 452 are fixedly connected to the inner ring array of the annular infusion box 451, and the several atomizing nozzles 452 all penetrate into the inner cavity of the discharge pipe 45. The receiving mechanism 5 includes a placement base 51, which is fixedly installed on the lower left side of the powder washing box 1. A slot 52 is opened on the top of the placement base 51, and a receiving box 53 is attached to the inner side of the slot 52. The receiving box 53 is located below the discharge pipe 45.

[0028] After the powder enters the inner cavity of the feeding pipe 45, the 0.1% stearic acid ethanol solution that was added in advance through the capped filling port 43 in the inner cavity of the stearic acid ethanol solution tank 42 can be extracted by starting the infusion pump 44 on the top of the base plate 41. The solution is then injected into the inner cavity of the annular infusion box 451 through the infusion pipe 441 and simultaneously atomized and sprayed from several ring-shaped atomizing nozzles 452. Before the powder enters the water washing process, a hydrophobic coating film is formed, which reduces the interparticle friction during subsequent cold isostatic pressing. Finally, the powder falls into the inner cavity of the receiving box 53. The powder can be removed by lifting the receiving box 53 in the slot 52 of the base 51 for easy transfer and water washing.

[0029] The working principle of the ultrasonic powder cleaning device used for chlorine-free fluoride ion acid washing of tungsten-doped powder will be explained in detail below.

[0030] like Figure 1-5As shown, during use, tungsten powder mixed with organic acid is poured into the inner cavity of the conical powder washing cylinder 2 after opening the cover 11. Then, the cover 11 is closed, allowing the rubber powder washing cylinder clamp 111 to engage with the inner cavity of the conical powder washing cylinder 2. Then, the first piezoelectric ceramic vibrator 24, the second piezoelectric ceramic vibrator 25, and the third piezoelectric ceramic vibrator 26 can be activated. The first piezoelectric ceramic vibrator 24 operates at a low frequency of 20kHz, primarily targeting the breakup of agglomerates; the second piezoelectric ceramic vibrator 25 operates at a medium frequency of 30kHz, enhancing acid penetration; and the third piezoelectric ceramic vibrator 26 operates at a high frequency of 40kHz, stripping surface complexes and covering the entire movement trajectory of the powder. Furthermore, during the ultrasonic powder washing process, nitrogen can be connected to the nitrogen input pipe 121, and the nitrogen can be injected into the two outlet boxes 123 inside the conical powder washing cylinder 2 through two gas supply pipes 122 by activating the air pump 12. The nitrogen is then blown out from several outlet nozzles 124. Since the two outlet boxes 123 face opposite directions, therefore… Combined with the nitrogen flow tangentially introduced through the sidewall, a swirling flow field is formed, forcibly suspending high-density tungsten powder and avoiding ultrasonic energy attenuation caused by sedimentation. After the powder washing is completed, the washed tungsten powder can be discharged by opening the electrically controlled valve 23, in conjunction with the ultrasonic vibration of the conical powder washing cylinder 2 and the bottom box 21 and the 30-degree inclination angle of the discharge pipe 22, until it enters the inner cavity of the discharge pipe 45. Then, by starting the infusion pump 44 at the top of the bottom plate 41, the inner cavity of the stearic acid ethanol solution tank 42 can be pre-filled with a covered filler. The 0.1% stearic acid ethanol solution added at the liquid inlet 43 is extracted and injected into the inner cavity of the annular infusion box 451 through the infusion tube 441. At the same time, it is atomized and sprayed from several atomizing nozzles 452 distributed in a ring. Before the powder enters the water washing process, a hydrophobic coating film is formed, which reduces the interparticle friction during subsequent cold isostatic pressing. Finally, the powder falls into the inner cavity of the receiving box 53. The powder can be removed by lifting the receiving box 53 in the slot 52 of the base 51, which is located in the inner cavity, for easy transfer and water washing.

[0031] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. An ultrasonic powder washing device for chlorine-fluoride ion-free acid washing of tungsten-doped powder, comprising a powder washing chamber (1), characterized in that: A conical washing cylinder (2) is fixedly installed in the inner cavity of the washing box (1). An inspection door (3) is hinged to the front side of the washing box (1). A discharge mechanism (4) is provided on the left side of the washing box (1). A receiving mechanism (5) is provided below the discharge mechanism (4). A bottom box (21) is fixedly connected to the bottom of the conical washing cylinder (2). A first piezoelectric ceramic vibrator (24) and a second piezoelectric ceramic vibrator (25) are fixedly installed on the outer wall of the conical washing cylinder (2). The first piezoelectric ceramic vibrator (24) is located above the second piezoelectric ceramic vibrator (25). A third piezoelectric ceramic vibrator (26) is fixedly installed at the bottom of the bottom box (21). An air pump (12) is fixedly installed in the inner cavity of the powder washing box (1). The input end of the air pump (12) extends through to the right side of the powder washing box (1) and is fixedly connected to a nitrogen input pipe (121). The output end of the nitrogen input pipe (121) is fixedly connected to two gas supply pipes (122). The other end of each of the two gas supply pipes (122) is fixedly connected to an air outlet box (123). The side of each of the two air outlet boxes (123) away from the gas supply pipes (122) extends through to the inner cavity of the conical powder washing cylinder (2) and is fixedly connected to several air outlet nozzles (124). The two air outlet boxes (123) face each other and are located on the front and rear sides of the inner cavity of the conical powder washing cylinder (2).

2. The ultrasonic powder cleaning device for chloride-fluoride ion-free acid washing of tungsten-doped powder according to claim 1, characterized in that: The bottom box (21) is fixedly connected to the left side of the discharge pipe (22) that passes through its inner cavity. The discharge pipe (22) is inclined at 30 degrees, and an electric control valve (23) is provided on the outer wall of the discharge pipe (22).

3. The ultrasonic powder cleaning device for chloride-fluoride ion-free acid washing of tungsten-doped powder according to claim 1, characterized in that: The top of the powder washing box (1) is hinged with a box cover (11), and the bottom of the box cover (11) is fixedly installed with a powder washing cylinder clamping plate (111). The powder washing cylinder clamping plate (111) is engaged with the top of the inner cavity of the conical powder washing cylinder (2).

4. The ultrasonic powder cleaning device for chloride-fluoride ion-free acid washing of tungsten-doped powder according to claim 2, characterized in that: The discharge mechanism (4) includes a base plate (41) and a discharge pipe (45). The base plate (41) is located above the discharge pipe (45). A stearic acid ethanol solution tank (42) and a delivery pump (44) are fixedly installed on the top of the base plate (41). The stearic acid ethanol solution tank (42) is located in front of the delivery pump (44). A covered liquid inlet (43) is fixedly connected to the top of the stearic acid ethanol solution tank (42) and extends through its inner cavity. The input end of the delivery pump (44) extends through to the bottom of the inner cavity of the stearic acid ethanol solution tank (42).

5. The ultrasonic powder cleaning device for chlorine-fluoride ion-free acid washing of tungsten-doped powder according to claim 4, characterized in that: The feed pipe (45) and the discharge pipe (22) are connected and fixedly connected at the end away from the bottom box (21). An annular infusion box (451) is fixedly installed on the outer wall of the feed pipe (45). An infusion pipe (441) communicating with the inner cavity of the annular infusion box (451) is fixedly connected to the output end of the infusion pump (44). A number of atomizing nozzles (452) are fixedly connected to the inner ring array of the annular infusion box (451), and all of the atomizing nozzles (452) penetrate into the inner cavity of the feed pipe (45).

6. The ultrasonic powder cleaning device for chloride-fluoride ion-free acid washing of tungsten-doped powder according to claim 1, characterized in that: The receiving mechanism (5) includes a placement base (51), which is fixedly installed on the lower left side of the powder washing box (1). The top of the placement base (51) is provided with a slot (52), and a receiving box (53) is attached to the inside of the slot (52). The receiving box (53) is located below the discharge pipe (45).

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