Yes, AVS-type equipment can be used for processing walnut shells, especially when intensive grinding and material activation are required. The most suitable option in GlobeCore’s range is the AVS-100 vortex layer device, which provides high-energy impact and shear due to the movement of ferromagnetic elements in an electromagnetic field.
In practice, AVS works best as part of a process line. Walnut shells should first be pre-crushed, after which the AVS-100 can be used for fine grinding and homogenization. This approach allows achieving a much finer and more uniform particle size compared to conventional milling.
Overall, if your goal is not only size reduction but also improved material reactivity or uniformity, AVS-100 is a strong and efficient solution, especially in combination with a pre-crushing stage.

When targeting micron-scale grinding of brittle organic materials such as walnut shells, the key challenge is not only achieving the required fineness, but maintaining a stable energy transfer throughout the milling process. At this scale, conventional grinding methods often face limitations due to particle agglomeration and uneven energy distribution.
For this reason, vortex-layer processing systems are often considered as part of a multi-stage approach, where preliminary size reduction is followed by high-energy fine treatment to achieve the target fraction.
The image below shows the AVS-100, a typical industrial vortex layer machine used for intensive material grinding and activation.

You’re correct that maintaining stable, uniform energy transfer is the crux of getting brittle organics like walnut shells down to micron sizes without excessive agglomeration. A vortex-layer AVS machine (AVS-100 for pilot/standard production, AVS-150 if you need higher throughput) is well suited to that high-energy fine-treatment stage because the electromagnetic field drives ferromagnetic elements to produce intense, controllable impact and shear across the charge, which gives much more even energy distribution than many conventional mills. In practice you’ll want a multi-stage line: pre-crush to a coarse fraction (typically <1 mm), then run the material through the AVS in either dry or wet mode with recirculation and multiple passes until your D50 approaches the tens-of-microns range.

To reduce agglomeration and stabilize the process, control feed rate, field strength (energy input), residence time and the load of ferromagnetic media, and manage temperature. Wet milling with a suitable dispersant/surfactant and anti-foam often helps reach 20 µm more consistently; monitor particle-size distribution online or by frequent sampling and use hydrocyclone/classification downstream to cut fines precisely. If you need very tight 20 µm control or higher consistency, follow the AVS with a rotor-stator colloid mill (CLM family) or consider finer finishing (AVSp nanomill for sub-micron work) after pilot testing to tune passes and parameters.