From: null@void.com   
      
   Carl  writes:   
      
   > On 7/14/25 4:22 AM, Richard Smith wrote:   
   >   
   >> Question - have any of you used "air elutriation"?   
   >> Given you do get some "very fines" when grinding rock and ores which   
   >> on several grounds would be good to separate first...   
   >> I sketched a device with a zig-zag for downward "clattering" material   
   >> flow / upward air flow.   
   >> The search-engine seeing my searches served-up ads. for exactly such   
   >> device - but much bigger and during recycling shredded plastic.   
   >> The idea is - where the problem is fine silica dust floating around in   
   >> the air - which is a health issue - you use the "fines floating in   
   >> air" to advantage and separate them that way.   
   >> How you'd recover the floating-in=air fines?  Electrostatic   
   >> precipitation?  If so, how would you drive it?  There has to be a   
   >> neater solution than running a var de Graaf generator...   
   >   
   > No experience with this but since you have the dust already entrained   
   > in flowing air would a cyclonic dust collector like used in   
   > woodworking shops be effective for this?  Even as a first stage if it   
   > dealt with a significant mass fraction it would make later stages of   
   > filtration that much cheaper and easier.   
      
   Thanks for this idea for recovery of the "dust" which is actually part   
   of the sample.   
      
   Yes, take what wins you can as soon as you can.   
   You remind me of these "cyclone" machines in woodworking shops.   
      
   The "very very fines" which form a "smoke" are unlikely to contain   
   values?  Which would be denser and be cycloned-out into another   
   fraction?  So if the "normal density" "very very fines" end up in a   
   filter whose "with dust weight" - "original weight" is taken to be the   
   mass of those very very fines, that would work.  Unlikely to need to   
   recover them.   
      
   I will look into this.   
   I can start with using a "wet&dry" workshop vac. to start "concept"   
   experiments.  Mine you can connect the hose to the "blow" side, which   
   should help.   
      
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