Selenium in bullion assays

F

Fred Stone

New Member
#1
Does anybody have information on cupel losses in bullion assays for high selenium material. I have seen 100% loss on some material that is in the percent range for Se.
 
fireguy

fireguy

Supermoderator
#2
Fred Stone said:
Does anybody have information on cupel losses in bullion assays for high selenium material. I have seen 100% loss on some material that is in the percent range for Se.
Selenium values over 2% seem to cause losses in cupellation. You should be able to remove some of the selenium in the crucible fusion with a high litharge flux (or perhaps in a scorification), but you may then have to correct for slag losses.

Perhaps a sulfuric pre-leach? Maybe a low temperature roast?

You will need to validate any method you decide on- especially if anyone is exchanging money :wink: .
 
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