A kind of recycling method of rare earth alloy powder reclaimed material
A rare earth alloy and alloy powder technology, which is applied in the field of recycling rare earth alloy powder recycling materials, can solve the problems of high activity, easy oxidation, combustion, and large specific surface area of rare earth alloy powder components, and achieve squareness and intrinsic coercivity Good strength, less over-grinding, lower cost
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[0038] The preparation method of the praseodymium-neodymium alloy powder added in the present invention is as follows: the praseodymium-neodymium alloy melt is prepared into the praseodymium-neodymium alloy, and the praseodymium-neodymium alloy is coarsely pulverized by hydrogen crushing and finely pulverized by conventional jet milling to obtain micron-sized praseodymium-neodymium alloy powder. Certainly, the preparation method of the added neodymium powder, samarium cerium alloy powder, samarium powder, Nd-Fe-B alloy powder, Nd-M alloy powder or Nd-Pr-M alloy powder can also refer to the above method.
[0039] For different batches of rare earth alloy powder reclaimed materials, 3 parts of rare earth alloy powder reclaimed materials are sampled each time, and the 3 parts of samples are passed through the steps of jet milling, sieving, forming, sintering and other steps of the present invention to obtain rare earth magnets, and the magnets passed the test According to the perf...
Embodiment 1
[0041] Get 300Kg of neodymium-iron-boron alloy powder reclaimed material, the mass percentage distribution of described neodymium-iron-boron alloy composition is as follows:
[0042]
[0043]The NdFeB alloy powder reclaimed materials with different average oxygen content are processed by different jet milling devices or treatment conditions described in Table 1 respectively, and the NdFeB alloy powder reclaimed materials are partially overoxidized, and the used oxygen content is 5ppm or less. The high-speed flow of inert gas impacts the recycled NdFeB alloy powder to obtain NdFeB alloy treated powder. The pressure of the gas nozzle at the bottom of the milling chamber is controlled to 0.6 MPa, and the time for jet milling to process the powder is 30 seconds. The rotating speed of the grinding and sorting wheel is 3500rpm. In each comparative example in Table 1, the axial extensions of the 3 side nozzles and the axial extension of 1 bottom nozzle have intersection points. T...
Embodiment 2
[0059] Get 600Kg of neodymium-iron-boron alloy powder reclaimed material, the mass percentage distribution of described neodymium-iron-boron alloy composition is as follows:
[0060]
[0061] The NdFeB alloy powder reclaimed material with different average oxygen content is processed by the jet mill treatment conditions described in Table 3, and the NdFeB alloy powder reclaimed material is partially overoxidized, and the high-speed flow of inert gas with an oxygen content below 5ppm is used. Impact treatment is carried out on the reclaimed NdFeB alloy powder to obtain NdFeB alloy processed powder. The gas nozzle is only installed at the bottom of the mill chamber of the jet mill device, and the pressure of the gas nozzle at the bottom of the mill chamber is controlled to be 0.7 MPa. Each implementation The jet milling time and the rotating speed of the sorting wheel of example and comparative example are as table 3. The ratio of the particle size distribution D90 to D10 of ...
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