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| Precious Metals Collection |
| How To Order |
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| Updated 6/8/2008 |
Most of you are familiar with a process called “Cupelling”. Briefly, this is the practice of adding
Litharge (Lead Oxide) to your assay materials in a clay cup, called a “cupel”, then firing it with a
furnace or torch to a molten state. As we know, the process has a most peculiar ability to adsorb
other, higher-melting-point metals like Gold, Silver, Platinum and other Precious metals.
The combination of a Borax flux and the Lead permit the higher-melt-point metals to melt at the
lower one of Lead. Even Platinum with a melting point of over 3,000 degrees F will be forced to
melt at the melt point of Lead, only 600+ degrees F.
The process continues as the precious metals are adsorbed into the lead, and then by an equally
strange phenomenon, the lead is absorbed into the clay crucible itself as the temperature is
deliberately increased, leaving only the precious metals as a bead in the center, behind.
This procedure is still used on a large scale, but obviously has many drawbacks, including the waste
of the lead itself, although cheap, is lost to further use, and of course the great danger presented
by the ever-present fumes given off by the hot molten lead, as it is kept hot, or is driven off in the
Cupelling Process to recover the precious metals portions.
Why use it at all?
It is cheap.
It works.
It eliminates many other leaching and precipitating steps, often the difference in profitability for
valuable ores.
What if we could find a better way?
If there was a metal that would likewise adsorb the Precious Metals we seek, while simultaneously
rejecting the Base metals we DON’T want, wouldn’t that be great?
Well, we have done just that, and developed .......
Litharge (Lead Oxide) to your assay materials in a clay cup, called a “cupel”, then firing it with a
furnace or torch to a molten state. As we know, the process has a most peculiar ability to adsorb
other, higher-melting-point metals like Gold, Silver, Platinum and other Precious metals.
The combination of a Borax flux and the Lead permit the higher-melt-point metals to melt at the
lower one of Lead. Even Platinum with a melting point of over 3,000 degrees F will be forced to
melt at the melt point of Lead, only 600+ degrees F.
The process continues as the precious metals are adsorbed into the lead, and then by an equally
strange phenomenon, the lead is absorbed into the clay crucible itself as the temperature is
deliberately increased, leaving only the precious metals as a bead in the center, behind.
This procedure is still used on a large scale, but obviously has many drawbacks, including the waste
of the lead itself, although cheap, is lost to further use, and of course the great danger presented
by the ever-present fumes given off by the hot molten lead, as it is kept hot, or is driven off in the
Cupelling Process to recover the precious metals portions.
Why use it at all?
It is cheap.
It works.
It eliminates many other leaching and precipitating steps, often the difference in profitability for
valuable ores.
What if we could find a better way?
If there was a metal that would likewise adsorb the Precious Metals we seek, while simultaneously
rejecting the Base metals we DON’T want, wouldn’t that be great?
Well, we have done just that, and developed .......
| New Report ! How to Collect Precious Metals with Low Temperature Molten Metal |
