As far as I know, every company using a hydromet process involves some kind of acid.
The ION process uses a benign solvent.
Check out the videos in this thread below, Ebbe explains the process.
https://hotcopper.com.au/threads/ion-media-thread.8534939/?get_post=true
IONDRIVE - ASX:ION Emerging Australian Battery Recycling Tech - Peer Comparisons / Industry Progress, page-20
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