Short-process method for preparing high-performance sintered NdFeB magnet by utilizing sintered NdFeB oil sludge waste material
A NdFeB high-performance technology, applied in magnetic objects, recycling technology, inductance/transformer/magnet manufacturing, etc., can solve the problems of magnetic powder without magnetic properties and cannot be applied, achieve good magnetic properties, reduce powder milling The effect of energy consumption and production cost reduction
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[0020] Example 1
[0021]Put 30ml of NdFeB sludge waste in a flask, add 450ml of distilled water, use a rotary evaporator for water bath distillation, and under vacuum conditions, step up the temperature, starting from 30 °C, and heating at 5 °C every 5min until 80 °C, wait for After the internal liquid was evaporated to dryness, the operation was repeated three times to obtain 26.42 g of distilled powder. Add 52 ml of acetone to the distilled powder, ultrasonically clean it for 3 times, then add anhydrous ethanol, ultrasonically clean it for 2 times, and the ultrasonic time is 10min each time. powder; test XRD (e.g. figure 1 shown), XRF (as shown in Table 1). Depend on figure 1 It can be seen that Fe is mainly in the powder after pretreatment 3 O 4 , Nd(CO 3 )(OH) 4 ·xH 2 O, Fe 2 Nd and Fe 2 B. The XRF results are shown in Table 1.
[0022] According to the element content in Table 1 and according to RE 2 Fe 14 B stoichiometric ratio, adding Nd before the reacti...
Example Embodiment
[0023] Example 2
[0024] Put 30ml of NdFeB sludge waste in a flask, add 450ml of distilled water, use a rotary evaporator for water bath distillation, under vacuum conditions, stepwise heating, starting from 30 °C, heating at 5 °C every 8min, until 80 °C, wait for After the internal liquid was evaporated to dryness, the operation was repeated twice to obtain 25.64 g of distilled powder. Add 51 ml of acetone to the distilled powder, ultrasonically clean it for 3 times, then add anhydrous ethanol, ultrasonically clean it once under a magnetic field, and the ultrasonic time is 12 min each time. Powder after pretreatment; test XRF, the results are shown in Table 2.
[0025] According to the element content and RE in Table 2 2 Fe 14 B stoichiometric ratio, adding Nd before the reaction 2 O 3 Make the total amount of rare earth up to 40%, add FeB to make the B content in the powder exceed 5%, CaH 2 The mass is 1.25 times the mass of the mixed powder, and the mass of CaO is Ca...
Example Embodiment
[0026] Example 3
[0027] Put 30ml of NdFeB sludge waste in a flask, add 450ml of distilled water, use a rotary evaporator for water bath distillation, under vacuum conditions, step-up heating, starting from 30 °C, heating at 5 °C every 10min, until 80 °C, wait for After the internal liquid was evaporated to dryness, the operation was repeated three times to obtain 25.26 g of distilled powder. Add 50.5 ml of acetone to the distilled powder, ultrasonically clean it for 3 times, then add absolute ethanol, and ultrasonically clean it twice for 15 minutes each time. After powder; test XRF, the results are shown in Table 3.
[0028] According to the element content and RE in Table 3 2 Fe 14 B stoichiometric ratio, adding Nd before the reaction 2 O 3 Make the total amount of rare earths reach 40%, add FeB to make the B content in the powder exceed 8%, CaH 2 The mass of the powder is 1.3 times the mass of the mixed powder, and the mass of CaO is CaH 2 0.5 times the mass. The ...
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