From: Chris M <chrism3667 at yahoo.com>
--- woodelf <bfranchuk at jetnet.ab.ca> wrote:
Chris M wrote:
They use solvents or whatever typically I guess,
but
the addition of a lot of heat might do it too.
You
can
build a small gas furnace for probably much less
then
$100 USD. Theoretically the temperature will be
limited only by the quality of the refractory
cement
used. Oi whatever.
Charcoal is the low cost fuel ... But then I don't
think one would get that much gold to need a
furnace.
The books are here.
http://www.lindsaybks.com/
Gas burns much hotter...unless you're talking about
*real* charcoal made from hardwoods. But you know
what...gas still burns much hotter. My point was you
could mess w/hydrochloric? acid and all that (wherever
you'd find it - I know someone's going to point out
how it could be commonly had, or maybe it's a
relatively *common* thing to find)...or you could just
burn off all the volatile gunk in a cheap furnace. But
you'd have some steel (pins) left over. That'll melt
too...at oh about 2800 degress Fahrenheit. Can't
remember if gold melts at a higher or lower
temperature. But at least you should be able to
separate the gold from the steel. Or come to think of
it maybe you could eliminate the steel before the
barbecue.
I'm not aware of a resistance element that'll go any
higher then ~2300 degrees, that being enough to melt
brass or prolly even pure copper. But the mints use
magnetic induction (with some sort of coil thingee).
But that requires and awful lot of juice I'm told.
Like enough to light a city block...
Hi
You don't want to melt the other metals first, most
metals will dissolve the gold and just make it harder to
refine. The best method is with acid. Muradic acid
should work ok to remove the other metals.
Gold melts quite hot. I don't recall any heater wire
that wouldn't melt first. In an inert gas, as was mentioned
by another, tungsten could be used. Other methods
include things like carbon arc or oxi-acetylene.
Dwight
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