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cupel    
n. 骨灰所制的坩锅,试金用灰皿
vt. 用灰皿提炼

骨灰所制的坩锅,试金用灰皿用灰皿提炼

cupel
n 1: a small porous bowl made of bone ash used in assaying to
separate precious metals from e.g. lead [synonym: {bone-ash
cup}, {cupel}, {refractory pot}]


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  • Common mistakes in cupellation - Gold Refining Metal Extraction Forum
    Since we cupel 84 samples at a time, it is impractical to load the lead buttons in to the cupels while they are in the furnace We place the buttons into the pre heated cupels then load that to the furnace Once our Mag-oxide cupels are pre heated, they turn from a grey color to a brilliant white De-slagging was mentioned and is also very
  • Cupelling help - Gold Refining Metal Extraction Forum
    A #7a cupel only holds about 40 grams which is why, I suppose, you broke the the 118 gram button into 4 pieces I would carefully weigh a few grams, 2 maximum, and wrap the sample in 10 times it’s weight of lead and cupel it normally The resulting bead will be all Precious metal From this test you will know the percentage of PM’s in your
  • Cupel sizes - Gold Refining Metal Extraction Forum
    Hi Moving away from all the harsh acids until I get a fume hood, I've decided to cupel for the moment There seems to be a bunch of sizes i e 7AL Mabor, 7X Mabor, 8A Mabor, etc Can someone explain what these mean? Thanks Kenzo
  • Chemical - Bone Ash Binder for fireing DIY cupels
    Typical bone ash mixture for making cupels this mix will make about 250 1 1 4 inch diameter by 1 inch high cupels 9000 grams bone ash 1000 grams portland cement 2500 ml of water When the mixture of ingredients is compressed into a cupel it will show no traces of liquid water Dry in areas of low humidity for 2 weeks, 4 weeks in more humid areas source; Fire Assaying for Gold Silver by
  • Cupel sizes | Page 2 | Gold Refining Metal Extraction Forum
    I put the cupel on top of an upside down crucible so it was at the top of the furnace Maybe that's the difference To cupel properly, you need 2 components for the reaction to happen properly The first is temperature, 1850 F , the second is a bit of atmospheric Oxygen The conversion of Pb
  • Trying to cupel - Gold Refining Metal Extraction Forum
    ideally you want to cupel at 1750°F and your melt furnace exceeds that temperature with little ability to control it closely You need more lead to effectively cupel the brazing rod for a 1 gram sample try 15 grams of lead
  • Questions about cupellation - Gold Refining Metal Extraction Forum
    The cupel composition can make a big difference The types can vary as to the lead retention and potential losses All in all, I think bone ash cupels are generally the best, but they are more expensive, less durable - they can break easily if handled roughly or if you don't store them properly in a dry area
  • home made cupels - Gold Refining Metal Extraction Forum
    I used a cupel mold bought from Charles Butler of ButlerLabs to press out some tiny cupels for torch assaying and tested them out They really should have been dried first but I was just testing them out so I torch dried them and added a small lead bead from some action mining flux and some crushed ore known to contain gold
  • How hot does a cupel furnace need to be? Can it get hot enough that PMs . . .
    The lead oxidizes base metals into a slag and when the volume of the lead after it is driven by oxidation is about half, the remaining lead and slag is poured into a assay cone mold, deslagged, and that lead alloy chunk is cupelled in a bone ash cupel This is an assay scale procedure not for large lots
  • Non-Chemical - First smelt cupel issues | Gold Refining Metal . . .
    the little cupel Preheated and I read 900 C a couple times for 30 or 45 minutes Total load was 1328 g I got a 40 g prill, which I thought was about right I have several recipes including a Chapman, but looks like I used too much litharge, but the cupel didn't obsorbe anything Thanks to all Click to expand





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