From: null@void.com   
      
   "Jim Wilkins"  writes:   
      
   > "Richard Smith"  wrote in message news:m14ivfnpw6.fsf@void.com...   
   > ...   
   >   
   > What you are doing is very important in the dry food, pharmaceutical   
   > and laundry detergent industries. The difficulty may be getting them   
   > to reveal their methods.   
   >   
   > Another way to separate by size for analysis is by settling time in a   
   > viscous liquid like olive oil. Diamond dust is separated by size for   
   > lapping that way, and a topsoil sample from sand.   
   >   
   > https://en.wikipedia.org/wiki/Vertical_roller_mill   
      
      
      
   > "Richard Smith"  wrote in message news:m14ivfnpw6.fsf@void.com...   
   > ...   
   >   
   > What you are doing is very important in the dry food, pharmaceutical   
   > and laundry detergent industries. The difficulty may be getting them   
   > to reveal their methods.   
   >   
   > Another way to separate by size for analysis is by settling time in a   
   > viscous liquid like olive oil. Diamond dust is separated by size for   
   > lapping that way, and a topsoil sample from sand.   
   >   
   > https://en.wikipedia.org/wiki/Vertical_roller_mill   
      
   Hi there   
      
   Thanks for affirming words.   
      
   Separation by falling through fluid column   
   - on a trivial level there is a "cheat" (it isn't actually) you can do   
   when manually wet sieving.   
      
   Because the sieve "blinds" with just above sieve sze particles - makes   
   it a lot quicker to deal with those last.   
   If you stir you sample mix in the water, if you leave it for a few   
   seconds, if you ladle from near the surface you will catch only fines,   
   which will drop straight through the sieve.   
   You can ladle into the sieve shorter and shorter times after stirring,   
   to get coarser and courser particles.   
   Finally you have the larger "drops straight to the bottom" sizes -   
   with no "clay" and/or other fines - so the tendency to bind on/in the   
   sieve is much much less.   
   Hence "blinding" of the sieve only happens at the end, and then with   
   nothing left to bind thus reducing the tendency to "blind".   
      
   That was a point my not-notably-talkative contact nodded about with a   
   general "you are well on the way" body-language.   
      
      
   This si the "air-elutriation" idea as best as can ASCII-sketch   
      
      
    ^   
    ^  air-flow   
    ^   
   \ \   
   / /   
   \ \   
   / /   
   \ \   
   / /   
   \ \   
   / /   
    ^   
    ^  air-flow   
    ^   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)