[BC] Silver soldering BRASS

[RichardBJohnson at comcast.net]

That's not how they separate uranium from ore. See
  
  http://en.wikipedia.org/wiki/Yellowcake

That's also not how they separate U235 from U238 except
in the movies. See

  http://en.wikipedia.org/wiki/Isotope_separation

Which was used for many years, but not any more.

--
Cheers,
Richard B. Johnson
Read about my book
http://www.LymanSchool.org


 -------------- Original message ----------------------
From: <seaberg1 at sbcglobal.net>
> Professor Al Loy had some students put the mix in a centrifuge but they 
> short-cut the mixing process and wound up with an undetermined mix.  Thus 
> the melting point variation.  This also brings up another question....how 
> long does the ore spin in a centrifuge to separate Uranium from the ore. 
> The movie (Can't remember the title.) suggests it is a rather lengthly 
> process.....but they do things differently in the movies.
> 
> Bob Seaberg -- W3MDM
> 
> ----- Original Message ----- 
> From: "Gary Peterson" <kzerocx at rap.midco.net>
> To: <broadcast at radiolists.net>
> Sent: Friday, October 19, 2007 8:17 AM
> Subject: [BC] Silver soldering BRASS
> 
> 
> >" Copper melts at lower temp. than brass, thus the theory that you
> > can't braze copper. ( though I've done it )
> > -- 
> > Cowboy "
> >
> > I guess I disagree with this one statement, above.  Every alloy, I am 
> > aware
> > of, melts at a lower temperature than that  of the highest-melting
> > constituent, pure element.  IIRC, this is because the atoms of different
> > elements cannot be packed, in a crystalline structure, as densely as ones
> > that are of all the same size.
> >
> > Pure copper (Cu) melts at 1981 degrees F.  Pure zinc (Zn) melts at 786
> > degrees F.  A brass alloy comprised of 85% Cu and 15% Zn has a listed
> > melting point of 1652-1724 degrees F.  I'm not certain why this specific
> > composition has a range, rather than a specific melting point.  I'm quite
> > certain that the higher the ratio of zinc to copper, the lower the M.P. of
> > the resulting brass alloy.
> >
> > (I always thought the ideal name for a professor of metallurgy would be Al
> > Loy)
> >
> > Gary, K(zero)CX
> > Rapid City, SD
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