Method for rapidly converting tungsten filament waste into oxide

Abstract

The invention discloses a method for quickly converting tungsten filament waste into oxides, which specifically comprises the following steps: tungsten filament waste crushing and dielectric barrier discharge plasma-assisted high-temperature ball-milling oxidation, the high-temperature ball-milling oxidation is carried out by using a high-temperature rotary furnace, and a metal grinding ball and a dielectric covering metal electrode are arranged in the high-temperature rotary furnace; the tungsten filaments are ionized and oxidized in the oxygen atmosphere within the interval of 650-750 DEG C, mechanical stripping of oxide powder is completed on the premise that low damage of grinding balls to the inner wall of the high-temperature-brittleness-resistant rotary furnace is guaranteed through low-speed mechanical grinding, plasma local bombardment provides an acceleration effect on high-temperature oxidation of the tungsten filaments, surface oxides can be further bombarded and separated, and the tungsten filaments are subjected to high-temperature oxidation and high-temperature oxidation. Therefore, the inner non-oxidized layer is exposed, the oxidation speed is increased, the capability of converting the tungsten filament waste into the oxide is achieved through the one-step method, and the oxide is rapidly prepared.

Description

Technical Field

[0001] The present application relates to the technical field of tungsten wire waste treatment, and in particular to a method for rapidly converting tungsten wire waste into oxides. Background Art

[0002] Common tungsten wire waste mainly includes tungsten wire after nickel removal, waste tungsten wire generated in the production process, and tungsten-nickel diamond wire generated in the photovoltaic industry. Since the treatment and recycling of tungsten wire waste is of great significance and value, most tungsten wire waste generated in the production and processing links will be treated and recycled, among which preparing it into tungsten oxide is one of the more common treatment methods.

[0003] At present, the main method for processing tungsten wire waste to prepare tungsten oxide is the sulfuric acid roasting-water immersion-calcination method. Although this method can effectively prepare tungsten oxide, the operation of this method is relatively complicated, difficult, and time-consuming. It involves sulfuric acid treatment, roasting, water immersion, and calcination, which affects the preparation efficiency of tungsten oxide. Summary of the invention

[0004] The purpose of this application is to provide a method for quickly converting tungsten wire waste into oxides, which is relatively simple to operate, has low difficulty, and is short in time. The oxides can be prepared quickly, greatly improving the preparation efficiency of the oxides.

[0005] In order to achieve the above object, the present application provides a method for quickly converting tungsten wire waste into oxides, comprising:

[0006] The specific content of the invention is as follows:

[0007] The oxide powder is prepared by oxidative crushing of tungsten wire waste through a heat-insulating calcination period set in a high-temperature rotary furnace, high-temperature oxidation in an oxygen atmosphere, plasma discharge bombardment and mechanical grinding with graded grinding balls.

[0008] Preferably, the tungsten wire waste is crushed by a shredder to prepare standard tungsten wire, and the length of some standard tungsten wires is between 1 and 2 times the maximum diameter of the graded grinding balls.

[0009] More preferably, the length of the portion of standard tungsten wire is between 1 and 1.5 times the maximum diameter of the graded grinding ball.

[0010] More preferably, the length of the standard tungsten wire having a content of 20-30% is greater than the maximum diameter of the graded grinding ball.

[0011] The length of the part of standard tungsten wire is limited to ensure that there is sufficient buffer force when the temperature and speed are increased to avoid the graded grinding balls and the inner wall of the high-temperature rotary furnace from colliding with each other and causing damage.

[0012] Preferably, the grading level of the graded grinding balls is 2 to 5.

[0013] More preferably, the graded grinding balls have three grades of gradation, with the first grade having a diameter of 18 to 22 mm, the second grade having a diameter of 13 to 17 mm, and the third grade having a diameter of 8 to 12 mm.

[0014] More preferably, the graded grinding balls are made of one or more of stainless steel, hard steel or tungsten carbide.

[0015] More preferably, the weight ratio of the graded grinding balls to the standard tungsten wire is 1 to 3:1, and the total volume of the balls accounts for 1 / 3 to 2 / 5 of the volume of the high-temperature rotary furnace cavity.

[0016] Too little filler affects the processing capacity, while too much filler is not conducive to ensuring the discharge plasma processing efficiency and grinding efficiency.

[0017] Preferably, the high-temperature oxidation is carried out by quantitatively placing the standard tungsten wire and graded grinding balls into the cavity of the high-temperature rotary furnace, and oxidizing at a high temperature of 650 to 750°C under an oxygen atmosphere. The operating speed of the high-temperature rotary furnace is the speed when the grinding balls are in a sliding state. The excitation working voltage of the plasma is 15 to 30 kV, the working current is 3 to 5 A, and the discharge frequency is 10 to 30 kHz.

[0018] The discharge area of ​​dielectric barrier discharge plasma contains a large number of highly active particles, such as electrons, ions, and metastable particles. Active oxygen ions are generated during plasma discharge using an oxygen atmosphere, which are more likely to combine with the active sites of the tungsten filament to achieve rapid oxide generation.

[0019] Preferably, the discharge plasma operates in a pulse discharge mode, and the pulse voltage frequency is 20 to 30 kHz.

[0020] The macroscopic discharge pulse formed by active particles can heat the surface of tungsten wire instantaneously, and the temperature of powder drops sharply during the pulse interval or when leaving the plasma. Such repeated heating and cooling process can induce huge thermal stress, thus promoting the crushing and refinement of powder. In oxygen atmosphere, local heating increases the oxidation rate of tungsten wire surface and changes the surface grain structure. The preparation and stripping of oxide can be achieved in high temperature rotary furnace without traditional high temperature conditions.

[0021] Preferably, the high temperature oxidation consists of a 2-3 h heating calcination period and a 2-4 h heat preservation calcination period.

[0022] More preferably, the temperature rise calcination period consists of a slow temperature rise section of 2 to 3 hours at a first operating speed and a fast temperature rise section of 30 minutes, and the heat preservation calcination period consists of a constant temperature section at a second operating speed.

[0023] More preferably, the first operating speed in the temperature-raising calcination period is smaller than the second operating speed in the temperature-keeping calcination period.

[0024] Preferably, the operating speed is 40-50% of the critical speed of the high-temperature rotary furnace.

[0025] More preferably, the cavity rotation direction diameter D of the high temperature rotary furnace ranges from 0.5 to 1.5 m, and the critical speed is

[0026] More preferably, the diameter of the high-temperature rotary furnace is 1 m, and the operating speed is 15-22 r / min.

[0027] The critical point at which the grinding ball changes from sliding to throwing is about 50% of the critical speed. When it is lower than the working speed, it only slides. When it is higher than the working speed, it starts to throw. When it exceeds the critical speed, it rotates centrifugally against the wall. Since the inner wall of a high-temperature rotary furnace is generally made of high-temperature resistant brittle material, throwing can easily cause damage to the inner wall. Therefore, the speed in the sliding state is used as the working speed. In order to compensate for the low ball milling energy caused by the sliding state and the inability to fully grind the tungsten oxide wire, the present invention uses discharge plasma as a replacement means.

[0028] Preferably, the working period of the plasma discharge bombardment is the heat preservation calcination period, the working atmosphere is an oxygen atmosphere, and the working oxygen content is 60-70%.

[0029] Preferably, after the high-temperature oxidation is completed, the rotation speed of the high-temperature rotary furnace is adjusted to a third operating speed for cooling, and the temperature is naturally cooled to room temperature.

[0030] More preferably, the third cooling operating speed is lower than the second operating speed.

[0031] Preferably, the oxidation rate of the oxide powder exceeds 99%, and the particle size of the oxide is less than 100 mesh.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The present invention is particularly suitable for converting tungsten wire waste such as tungsten wire after nickel removal, waste tungsten wire generated in the production process, and tungsten-nickel diamond wire generated in the photovoltaic industry into oxides. This method uses a shredder to obtain tungsten wire waste of appropriate size, which is suitable for buffering grinding balls during high-temperature rotary furnace ball milling but ensures that the problem of entanglement and difficulty in grinding is not too long.

[0034] (2) The high temperature resistant grinding balls work in a sliding state under the premise of ensuring low loss on the surface of the metal balls under high temperature conditions. The metal grinding balls ensure high efficiency of ball milling energy transfer, thereby ensuring the mechanical processing efficiency of tungsten wire waste in a low-speed high-temperature rotary furnace.

[0035] (3) The introduction of dielectric barrier discharge plasma, under the premise of ensuring that the metal wire in the high-temperature converter cavity does not cause electrode contamination, provides active particles including electron flow and ion flow, which impact the metal surface with high altitude and high energy. The energy carried will be transferred to the material in the form of heat, resulting in local rapid heating of the tungsten wire, reducing the calcination temperature requirement of the high-temperature rotary furnace, accelerating the surface oxidation, lattice growth and even mismatch melting of the tungsten wire. The temperature difference change during the rotation process causes the surface oxide layer to generate a thermal stress release demand, and finally achieves a state where the tungsten wire surface is rapidly oxidized and the oxide layer is loose and easy to peel off, which is conducive to ball milling.

[0036] (4) The dielectric barrier discharge plasma ball milling oxidation method improves the oxidation rate and conversion rate of tungsten wire. This method is relatively simple to operate and takes less time, achieving the purpose of quickly preparing powdered oxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a schematic diagram of the method flow of the present invention.

[0039] Figure 2 It is a schematic diagram of the dielectric barrier discharge plasma ball milling high temperature oxidation of the present invention.

[0040] The meanings of the accompanying numbers are: 1-base, 2-graded grinding balls, 3-high-temperature rotary furnace, 4-dielectric barrier layer, 5-metal electrode, 6-temperature-controlled power supply, 7-high-frequency power supply, 8-oxygen source, 9-tungsten wire waste, 10-oxide powder, 11-inner wall of the rotary furnace. DETAILED DESCRIPTION

[0041] The endpoints and any values ​​of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed in the present invention.

[0042] See also Figure 1 , Figure 1 It is a schematic flow chart of a method for rapidly converting tungsten wire waste into oxides provided in an embodiment of the present application.

[0043] A method for rapidly converting tungsten wire waste into oxides according to an embodiment of the present application comprises the following steps:

[0044] S1: Material preparation, including crushing of tungsten wire waste and quantitative preparation of graded grinding balls, and finally placing them into the high-temperature rotary furnace cavity;

[0045] S2: Heating and preheating calcination, including slow heating and fast heating of the high-temperature rotary furnace, and ensuring that the graded grinding balls are in a sliding state at the first working speed;

[0046] S3: heat preservation calcination, under the set temperature condition, the high temperature rotary furnace operates at the second working speed, and plasma discharge bombardment is performed in an appropriate oxygen atmosphere;

[0047] S4: Cooling and screening, screening the oxide powder and the residual wires after natural cooling at the third working speed.

[0048] like Figure 2 As shown, the dielectric barrier discharge plasma assisted ball milling oxidation system includes a base 1, graded grinding balls 2, a high-temperature rotary furnace 3, a dielectric barrier layer 4, a metal electrode 5, a temperature-controlled power supply 6, a high-frequency power supply 7, an oxygen source 8, tungsten wire waste 9, oxides 10, and an inner wall of a rotary furnace 11.

[0049] The high temperature rotary furnace 3 and the metal electrode 5 are respectively connected to two poles of the high frequency power supply 7 to form a discharge system. The dielectric barrier layer 4 covers the metal electrode 5 in the cavity of the high temperature rotary furnace 3 to form a dielectric barrier discharge plasma system.

[0050] The high-temperature rotary furnace is cylindrical, with a diameter of 1 m in the rotating direction, and the inner wall of the rotary furnace is made of silicon carbide.

[0051] The specific implementation methods are as follows:

[0052] Embodiment 1:

[0053] (1) Material preparation. The tungsten wire waste from photovoltaic use is crushed by a tearing machine, containing W-98.5%. The length of 30% of the crushed tungsten wire waste 9 is controlled between 20 and 24 mm, and is placed in the cavity of the high-temperature rotary furnace 3 together with the graded grinding ball 2. The graded grinding ball is made of tungsten carbide and has a hardness of 1100HV. The graded grinding ball 2 is divided into three grades. The diameter of the first grade graded grinding ball is 18 mm, accounting for 10% of the number, the diameter of the second grade graded grinding ball is 14 mm, accounting for 50% of the number, and the diameter of the third grade graded grinding ball is 10 mm, accounting for 40% of the number. The ball-to-material ratio of the tungsten wire waste 9 and the graded grinding ball 2 is 1:3, and the volume ratio in the cavity of the high-temperature rotary furnace 3 is 2 / 5.

[0054] (2) Heating and calcining. After the material is placed in the high-temperature rotary furnace 3, the operating speed of the high-temperature rotary furnace 3 is set to 18r / min. After slowly starting, the speed is increased to the operating speed, and the graded grinding balls and the inner wall of the rotary furnace form a sliding state. At the same time, the temperature control power supply 6 is turned on, and the temperature is slowly increased to 700°C within 2.5h and quickly increased to 750°C for 30min. The heating process is the heating forging period. No plasma discharge bombardment is performed during the heating and calcining period.

[0055] (3) Heat preservation and calcination. After the temperature rise and calcination period, the operating speed is increased to 22 r / min, and the oxygen source 8 is turned on to continuously supply oxygen, requiring the oxygen content in the cavity of the high-temperature rotary furnace 3 to reach 70%. Then the dielectric barrier discharge plasma system is started, and the working frequency of the high-frequency power supply 7 is 30 kHz, the working voltage is 25 kV, and the working current is 5 A. Discharge plasma is excited between the metal electrode 5 and the inner wall 11 of the rotary furnace and the tungsten carbide grinding ball 2, and the heat preservation and calcination is continued for 4 hours.

[0056] (4) Cooling. Stop the high-frequency power supply 7 and the oxygen supply 8, set the cooling speed to 10 r / min, uniformly reduce it to the third working speed, and then naturally cool it to room temperature before taking out the material.

[0057] (5) Material screening: The graded grinding balls are screened out through a large screen, and then the oxide powder 10 is separated from the incompletely pulverized tungsten wire waste 9 through a 100-mesh screen, thereby achieving high-purity preparation of the oxide powder.

[0058] Determined by chemical detection method, the oxidation rate of the powder is 98.5%, containing 98% tungsten oxide, and the rest is tungsten carbide, silicon carbide, etc.

[0059] Embodiment 2:

[0060] This embodiment is an oxidation treatment of photovoltaic tungsten filament waste containing 99% tungsten. The dielectric barrier discharge plasma assisted ball milling oxidation system is the same as that of the first embodiment.

[0061] The specific implementation methods are as follows:

[0062] (1) Material preparation. The tungsten wire waste from photovoltaic use is crushed by a tearing machine. The length of 30% of the crushed tungsten wire waste 9 is controlled between 20 and 24 mm, and is placed in the cavity of the high-temperature rotary furnace 3 together with the graded grinding balls 2. The graded grinding balls are made of stainless steel with a hardness of 550HV. The graded grinding balls 2 are divided into three grades. The diameter of the first grade graded grinding balls is 20 mm, accounting for 15% of the number, the diameter of the second grade graded grinding balls is 16 mm, accounting for 45% of the number, and the diameter of the third grade graded grinding balls is 12 mm, accounting for 40% of the number. The ball-to-material ratio of the tungsten wire waste 9 and the graded grinding balls 2 is 1:3, and the volume ratio in the cavity of the high-temperature rotary furnace 3 is 2 / 5.

[0063] (2) Heating and calcining. After the material is placed in the high-temperature rotary furnace 3, the first operating speed of the high-temperature rotary furnace 3 is set to 18r / min. After slowly starting, the speed is increased to the first operating speed, and the graded grinding balls and the inner wall of the rotary furnace form a sliding state. At the same time, the temperature control power supply 6 is turned on, and the temperature is slowly increased to 700°C within 2.5h and quickly increased to 750°C for 30min. The heating process is the heating forging period. No plasma discharge bombardment is performed during the heating and calcining period.

[0064] (3) Heat preservation and calcination. After the temperature rise and calcination period, the operating speed is increased to 22 r / min, and the oxygen source 8 is turned on to continuously supply oxygen, requiring the oxygen content in the cavity of the high-temperature rotary furnace 3 to reach 70%. Then the dielectric barrier discharge plasma system is started, and the working frequency of the high-frequency power supply 7 is 30 kHz, the working voltage is 30 kV, and the working current is 5 A. Discharge plasma is excited between the metal electrode 5 and the inner wall 11 of the rotary furnace and the tungsten carbide grinding ball 2, and the heat preservation and calcination is continued for 4 hours.

[0065] (4) Cooling. Stop the high-frequency power supply 7 and the oxygen supply 8, set the cooling speed to 15 r / min, uniformly reduce the speed to the set speed, and then naturally cool to room temperature before taking out the material.

[0066] (5) Material screening: The graded grinding balls are screened out through a large screen, and then the oxide powder 10 is separated from the incompletely pulverized tungsten wire waste 9 through a 100-mesh screen, thereby achieving high-purity preparation of the oxide powder.

[0067] Determined by chemical detection method, the oxidation rate of the powder is 98.8%, containing 98.5% tungsten oxide, and the rest is iron oxide, silicon carbide, etc.

[0068] Embodiment 3:

[0069] This embodiment is an oxidation treatment of photovoltaic tungsten filament waste containing W-86.39% and Ni-13.72%. The dielectric barrier discharge plasma assisted ball milling oxidation system is the same as that of the first embodiment.

[0070] The specific implementation methods are as follows:

[0071] (1) Material preparation. The tungsten wire waste from photovoltaic use is crushed by a tearing machine. The length of 30% of the crushed tungsten wire waste 9 is controlled between 18 and 22 mm, and is placed in the cavity of the high-temperature rotary furnace 3 together with the graded grinding balls 2. The graded grinding balls are made of hard steel with a hardness of 750HV. The graded grinding balls 2 are divided into three grades. The diameter of the first graded grinding balls is 18 mm, accounting for 20% of the number, the diameter of the second graded grinding balls is 14 mm, accounting for 50% of the number, and the diameter of the third graded grinding balls is 10 mm, accounting for 30% of the number. The ball-to-material ratio of the tungsten wire waste 9 and the graded grinding balls 2 is 1:2, and the volume ratio in the cavity of the high-temperature rotary furnace 3 is 2 / 5.

[0072] (2) Heating and calcining. After the material is placed in the high-temperature rotary furnace 3, the first operating speed of the high-temperature rotary furnace 3 is set to 15r / min. After slowly starting, the speed is increased to the first operating speed, and the graded grinding balls and the inner wall of the rotary furnace form a sliding state. At the same time, the temperature control power supply 6 is turned on, and the temperature is slowly increased to 600°C within 2h and quickly increased to 650°C for 30min. The heating process is the heating forging period. No plasma discharge bombardment is performed during the heating and calcining period.

[0073] (3) Heat preservation and calcination. After the temperature rise and calcination period, the operating speed is increased to 20r / min, and the oxygen source 8 is turned on to continuously supply oxygen, requiring the oxygen content in the cavity of the high-temperature rotary furnace 3 to reach 60%, and then the dielectric barrier discharge plasma system is started, the working frequency of the high-frequency power supply 7 is 20kHz, the working voltage is 20kv, and the working current is 3A, and the discharge plasma is excited between the metal electrode 5 and the inner wall 11 of the rotary furnace and the tungsten carbide grinding ball 2, and the heat preservation and calcination is continued for 3h.

[0074] (4) Cooling. Stop the high-frequency power supply 7 and the oxygen supply 8, set the cooling speed to 10 r / min, uniformly reduce the speed to the set speed, and then naturally cool to room temperature before taking out the material.

[0075] (5) Material screening: The graded grinding balls are screened out through a large screen, and then the oxide powder 10 is separated from the incompletely pulverized tungsten wire waste 9 through a 100-mesh screen, thereby achieving high-purity preparation of the oxide powder.

[0076] Determined by chemical detection method, the oxidation rate of the powder is 98.5%, containing 94.5% tungsten oxide, 4.6% nickel oxide, and the rest is iron oxide, silicon carbide, etc.

[0077] Comparative Example 1

[0078] The other conditions were the same as those in Example 1, but plasma discharge bombardment was not performed, and the calcination temperature was 800° C. After 4 hours of oxidation calcination, the tungsten oxide content was 86% by screening test, and the tungsten wire waste was in filamentous form, and the inside of the tungsten wire was not completely oxidized.

[0079] Comparative Example 2

[0080] The other conditions were the same as those in Example 1, but plasma discharge bombardment and ball milling were not performed, and the calcination temperature was 800° C. After 4 hours of oxidation calcination, the tungsten oxide content in the screening test reached 90%, and the tungsten wire waste was in filament form, and the inside of the tungsten wire was not completely oxidized.

[0081] Comparative Example 3

[0082] The other conditions were the same as those in Example 1, but plasma discharge bombardment and ball milling were not performed, and the calcination temperature was 650° C. After 4 hours of oxidation calcination, the tungsten oxide content in the screening test reached 34%, and the tungsten wire waste was in filament form, and the inside of the tungsten wire was not completely oxidized.

[0083] Comparative Example 4

[0084] The other conditions were the same as those in Example 1, but plasma discharge bombardment was not performed, and the calcination temperature was 650° C. After 4 hours of oxidation calcination, the tungsten oxide content in the screening test reached 37%, and the tungsten wire waste was in filament form, and the inside of the tungsten wire was not completely oxidized.

[0085] The oxidation rate, tungsten oxide content, and silicon carbide content of Examples 1-3 and Comparative Examples 1-4 were determined by chemical methods, and the powder D50 particle size was determined by laser particle size measurement to evaluate the specific effects of the present invention, as shown in Table 1.

[0086] Table 1

[0087] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Oxidation rate 98.5％ 98.8％ 98.5％ 88.5％ 91％ 35.5％ 38.3％ Tungsten Oxide 98％ 98.5％ 94.5％ 86％ 90％ 34％ 37％ Silicon Carbide 0.5％ 0.5％ 0.3％ 0.5％ 0.5％ 0.5％ 0.5％ Powder D50 particle size 53μm 61μm 44μm 72μm 41μm 38μm 55μm Filamentous residue 0.1％ 0.1％ 0.1％ 23％ 95％ 97％ 84％

[0088] As can be seen from Table 1, Comparative Examples 1 and 2 cannot be completely oxidized due to the calcination at a high temperature of 800°C but insufficient calcination time. Comparative Examples 3 and 4 have lower oxidation degrees at a lower temperature of 650°C for the same length of time, while Examples 1-3 can achieve a higher oxidation level within the same calcination time due to local high temperature heating of the plasma.

[0089] After oxidation, the obvious difference in the amount of filamentous residues shows that if the graded grinding balls are not superimposed for grinding, the removal rate of filamentous residues and surface oxides is significantly lower. Although the D50 particle size of the powders in Comparative Examples 2 and 3 is lower, it is inferred that the graded grinding balls can only remove the surface fine powder because of the low oxidation degree.

[0090] In addition, the high temperature rotary furnace in Example 3 has a relatively low operating speed, which causes less damage to the inner wall of the silicon carbide, and thus the silicon carbide content in the oxide powder is relatively small. Therefore, it is necessary to ensure that the sliding state of the graded grinding balls is within a reasonable range.

[0091] By comparing the product index parameters of the embodiment and the comparative example, it can be clearly seen that the dielectric barrier discharge plasma assisted ball milling high temperature oxidation method of the present invention has significant progress.

[0092] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for rapidly converting tungsten wire waste into oxides, characterized in that: The method comprises the following steps: oxidizing and crushing the tungsten wire waste to prepare oxide powder by setting a heat preservation calcination period in a high-temperature rotary furnace, high-temperature oxidation in an oxygen atmosphere, plasma discharge bombardment, and mechanical grinding with graded grinding balls. S1) crushing the tungsten material, the tungsten wire waste is crushed by a shredder to prepare standard tungsten wire, the length of some standard tungsten wires is between 1 and 2 times the maximum diameter of the graded grinding balls, and the graded grade of the graded grinding balls is 2 to 5; S2) Tungsten material oxidation, the standard tungsten wire and graded grinding balls are quantitatively placed in the high-temperature rotary furnace cavity, and oxidized at 650-750°C in an oxygen atmosphere. The operating speed of the high-temperature rotary furnace is the speed when the grinding balls are in a sliding state. The excitation voltage of the plasma is 15-30 kV, the operating current is 3-5 A, and the discharge frequency is 10-30 kHz.

2. A method for rapidly converting tungsten wire waste into oxides according to claim 1, characterized in that: The graded grinding balls have three grades of gradation, the first grade has a diameter of 18 to 22 mm, the second grade has a diameter of 13 to 17 mm, and the third grade has a diameter of 8 to 12 mm.

3. A method for rapidly converting tungsten wire waste into oxides according to any one of claims 1 and 2, characterized in that: The material of the graded grinding balls is one or more of stainless steel, hard steel or tungsten carbide, the weight ratio of the graded grinding balls to the standard tungsten wire is 1 to 3:1, and the total volume of the balls accounts for 1 / 3 to 2 / 5 of the volume of the high-temperature rotary furnace cavity.

4. A method for rapidly converting tungsten wire waste into oxides according to claim 1, characterized in that: The high temperature oxidation consists of a 2-3h heating calcination period and a 2-4h heat preservation calcination period.

5. A method for rapidly converting tungsten wire waste into oxides according to claim 5, characterized in that: The temperature rise calcination period consists of a slow temperature rise period of 2 to 3 hours at a first operating speed and a fast temperature rise period of 30 minutes, and the heat preservation calcination period consists of a constant temperature period at a second operating speed.

6. A method for rapidly converting tungsten wire waste into oxides according to claim 5, characterized in that: The first operating speed during the temperature-raising calcination period is smaller than the second operating speed during the temperature-keeping calcination period.

7. A method for rapidly converting tungsten wire waste into oxides according to any one of claims 1, 5 and 6, characterized in that: The working speed is 40-50% of the critical speed of the high-temperature rotary furnace.

8. A method for rapidly converting tungsten wire waste into oxides according to any one of claims 4, 5 and 6, characterized in that: The working period of the plasma discharge bombardment is the heat preservation calcination period, the working atmosphere is an oxygen atmosphere, and the working oxygen content is 60-70%.

9. A method for rapidly converting tungsten wire waste into oxides according to claim 1, characterized in that: After the high-temperature oxidation is completed, the rotation speed of the high-temperature rotary furnace is adjusted to a third operating speed, and the temperature is naturally lowered to room temperature.

10. A method for rapidly converting tungsten wire waste into oxides according to claim 1, characterized in that: The oxidation rate of the oxide powder exceeds 98%.

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