Lead

[Keith Roberts]

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Hi Joe,  Lead is made from the sulfide, which is mined. After it's =
isolation through burning (lead oxide and sulfur dioxide) and reduction =
of the lead oxide with carbon, (lead and carbon dioxide) it contains a =
lot of impurities such as antimony, arsenic, silver, gold, copper, zinc. =
It is very difficult to remove the impurities. Pure lead is probably =
hard to come by.
Plus you have the wild card of recycled lead which could contain any =
number of impurities such as battery acid. The lead problem might =
coincide with poor economic conditions or war where the lead was being =
used. All in all it's a crap shoot, kind of like the expanding action =
bracket thing. Anybody can cook up a bad batch.

Keith=20


----- Original Message -----=20
  From: Joe Garrett=20
  To: pianotech=20
  Sent: Monday, January 03, 2005 9:15 PM
  Subject: Re: Lead


  Ron N said: ">Hmm... I had it wrong, then; I had thought that it was =
impurities in lead=20
  >that accelerated oxidization (making that white stuff).
  >
  >--Cy Shuster--

  It is. Pure lead is stable. The surface oxidizes, but it doesn't =
exfoliate.=20
  Just lies there quietly like a lump of lead.

  Ron N,
  Hmmmmmm? Having worked with most of the lead alloys, in my bullet/ball =
making hobby, I'd say we're both right. And we're both wrong.
  The stuff that gets really swollen, etc., when melted/cast seems to be =
soft. This stuff is very good for the bullets in a black powder rifle. =
(I suspect it may have a small amount of tin. The pure lead, that I've =
melted, for use in balls for my Black Powder Pistol, is softer than the =
stuff above. It deforms more when loaded, which makes for a better seal =
in the cylinder. Wheel Weight lead, on the other hand, is only suitable =
for modern weaponry, as it holds it's shape better, in the reloading =
dies, etc., and in target shooting.
  In conclusion, I suspect that the nasty stuff has small amount of tin. =
Because of this, you have two disimilar metals that will interact and =
cause electrolysis, which really what is happening here. Wheel weight =
lead, on the other hand, has so much tin in it, that is resists =
electrolysis/corrosion, IMO. As all of this is speculation, on my part, =
gained by melting the various types and using as bullets/balls. K?
  Best Regards,
  Joe Garrett, R.P.T.
  Captain, Tool Police
  Squares R I

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