Short-process method for preparing sintered NdFeB magnets with high magnetic properties recycling from NdFeB sludge
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United States of America Patent
Stats
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Aug 8, 2017
Grant Date -
Sep 8, 2016
app pub date -
Apr 19, 2016
filing date -
Mar 8, 2015
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention discloses a short process preparation technology of sintered NdFeB magnets from the NdFeB sludge, which relates to a field of recycle technology of NdFeB sludge. The present invention comprises the following steps: water bath distillation of organics in sludge, ultrasonic cleaning, calcium reduction and diffusion, ultrasonic rinsing in a magnetic field and drying, powders mixing and sintering. NdFeB sludge as raw materials was directly prepared from recycled sintered magnets with high magnetic properties. Most of the organics in the sludge could be removed by a vacuum distillation process with stepwise heating. The ultrasonic rinsing process in a magnetic field could effectively remove the remaining organics. The recycled sintered magnets exhibited good maximum energy product [(BH)max] of 35.26 MGOe. The present invention has important features, such as the short processing time, efficient environmental protection, high recycling rate and effective utilization rate of rare earth metals.
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International Classification(s)
- 2016 Application Filing Year
- B22F Class
- 1277 Applications Filed
- 838 Patents Issued To-Date
- 65.63 % Issued To-Date
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- 0 Citation Count
- B22F Class
- 0 % this patent is cited more than
- 8 Age
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