"Jon Elson" wrote in message
...
Mark Rand wrote:
I've got a few projects that could usefully start from aluminium
castings. I
also currently have 120 ex-server hard disks.

When stripped of all the steel, copper, magnets and electronics the hard
disks
yield 12oz-1lb of powder coated or cobalt sputtered aluminium. Probably
in
three different alloys (case, platters and HP/Compaq mounting brackets)

The question is, does the team think that these will be a good source of
casting stock once they've been melted down, de-drossed and cast into
ingots?

The cases make great casting aluminum that also machines very well.

The platters may be more exotic stuff, but did you know most of the dull
silvery-colored ones are plated with pure platinum? There are some web
sites that have simple systems for peeling the platinum off.

Jon

Had you been following the gold forum, you'd know that that is not the case.
Discs with platinum are not commonly found. For the most part, everyone
has abandoned the idea of recovering platinum from them.

Harold