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12AX7
Post Harlot
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Registered: 8-3-2005
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Charcoal will reduce lead above red heat, so you'll have to superheat it quite a bit. A flux may help (seperate metal from oxide and oxide
reduction), for which borax might be suitable. I don't think you want to mess around with a silica based slag which melts up around yellow heat
(gague being silica based, this is of course the choice of primary lead smelters). A steel crucible should be fine (lead does not dissolve iron
appreciably), but may react with molten or dissolved oxides (slag, etc.).
Tim
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Zinc
Hazard to Others
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Registered: 10-5-2006
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| Quote: | Originally posted by vulture
He's going to BLOW IT UP. You think the lead will stay nicely in place?
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Yes it will. As I said it will be buried. So the parts will remain in the ground and we will recover them.
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JohnWW
International Hazard
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Some other uses of Pb: It could be rolled into sheets and used as flashing in roofing, or for a corrosion-resistant roof made entirely of Pb sheet;
oxidized by heating in air to PbO and this used in glass-making to make heavy "crystal" glass (about 30 to 35% PbO, especially useful for paperweights
and heavy glass vessels less easily tipped over) or as a white paint and glaze pigment if TiO2 cannot be obtained; or oxidized further to Pb3O4 ('red
lead"), and this used as a pigment in paints and glazes, as a fungicide, and as a seed coating to discourage birds from eating the seeds.
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Mr. Wizard
International Hazard
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I found this link yesterday.
http://www.pyrobin.com/files/thermit(e)%20journal.pdf
It had a section on using lead sulfide ore (Galena) with aluminum to produce pure lead. I don't recommend doing this with lead battery components as
it may be a little TOO successful and fast. But the interesting part was if they used a little extra aluminum with the sulfide it remained as ball on
top of the lead after the reaction, and was 'hard'. They are actually trying to produce Aluminum Sulfide. Here is the text:
"The presence of sulphide of lead as an impurity is guarded against by keeping a slight excess of aluminium in the charge, which excess of metal will
be found after casting the molten product as a hard, brittle, and easily detachable button on the surface of the lead. Aluminium will not alloy with
lead, but it will form alloys with iron, silicon, copper, silver, gold, &c. The excess of metallic aluminium therefore performs the double
function of keeping the sulphide of aluminium pure, and of removing all iron, copper, &c., from the lead, giving to the latter remarkable purity
and softness. Further, by judiciously mixing the aluminium and the galena, this excess button removes any precious metals which may be contained in
the sulphide of lead, much in the same manner as zinc desilverizes lead in the Parkes process. (The addition of a small percentage of aluminium to the
zinc used in the Parkes process permits of a higher temperature being used ; it prevents the format on of oxide or zinc and effects better separation
of the precious metals."
So lead can be purified by mixing it with molten aluminum. This is a little inconvenient as the temperature is above what a normal lead pot will
produce, but it is easily available with aluminum casting equipment. I wonder what the vapor pressure of lead is at the melting point of aluminum? I
know from personal experience that any zinc in a lead pot will cause problems. The zinc causes the lead to have a 'skin' which interferes with mold
filling and pouring.
[Edited on by Mr. Wizard]
Attachment: ALUMINIUM AS A HEATING AND REDUCING AGENT. BY DR. HANS GOLDSCHMIDT AND CLAUDE VAUTIN .pdf (63kB)
This file has been downloaded 811 times
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