I’m not sure, but you should be careful while handling this stuff. It seems like it’s hazardous - the dust it produces in particular. You’re not supposed to handle it without gloves. I also can’t find any info about drying it out safely if the dust it produces isn’t supposed to be breathed in.
Maybe you’ve done this research already, and I’m overthinking this, but whatever you wind up doing, just be safe.
https://www.vanairsystems.com/wp-content/uploads/2019/03/activated-alumina-msds-sheet.pdf
It’s actually a portal to Hell.