Electrolytic Hydrogen Decrepitation of NdFeB Magnets

Electrolytic Hydrogen Decrepitation (EHD) is a method used for the fragmentation of NdFeB magnets. Here’s how the process generally works:

Preparation: The NdFeB magnets are first crushed or ground into coarse particles. These particles typically have a size ranging from several millimeters to a few centimeters.

Electrolyte Bath: The crushed NdFeB particles are then submerged in an electrolyte bath, usually containing a solution of dilute acid or alkaline solution. The choice of electrolyte depends on factors such as the desired particle size distribution and the specific properties of the magnets.

Electrolysis: An electric current is passed through the electrolyte bath, causing hydrogen gas to be generated at the surface of the NdFeB particles. This process is facilitated by the reaction between the electrolyte and the metal components of the magnets.

Hydrogen Absorption: The generated hydrogen gas diffuses into the interstitial spaces within the NdFeB particles, leading to the formation of hydrides. This process causes the particles to expand or swell, exerting mechanical stress on the material.

Decrepitation: The mechanical stress induced by hydrogen absorption causes the NdFeB particles to fracture or break apart into smaller fragments. This fragmentation process is known as decrepitation.

Particle Size Control: By controlling parameters such as the current density, electrolyte concentration, and processing time, it is possible to adjust the extent of hydrogen absorption and decrepitation, thereby controlling the size distribution of the resulting particles.

Separation and Recovery: After decrepitation, the resulting particle mixture typically consists of a range of sizes. These particles can then be separated based on size using techniques such as sieving or magnetic separation. The recovered particles can be further processed or reused in various applications.

Electrolytic Hydrogen Decrepitation of NdFeB Magnets

Electrolytic Hydrogen Decrepitation of NdFeB Magnets

Electrolytic Hydrogen Decrepitation offers several advantages for the recycling and processing of NdFeB magnets, including the ability to produce fine particle sizes with high yield and minimal contamination. Additionally, it is a relatively environmentally friendly process compared to traditional methods such as mechanical grinding, as it does not involve the use of harsh chemicals or generate significant waste streams.

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