Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

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Brittle Bars (1 reply)

E
aeolson
5 years ago
aeolson 5 years ago

Having some issues with all of a sudden brittle dore bars from our ILR.    The bars used to run about 95% combined Au/g.   However this has dropped to to around 80% with the new actor being pb. Cu is about 4 ppm

On a typical batch we use 6 to 7 kg of flux.  Our current recipe is:

50% Borax, 22% Silica, 14% soda ash and 14% sodium nitrate.

Suggestions/Comments appreciated.

Eric

T
Todd H
4 years ago
Todd H 4 years ago

What is the source of the Pb?  It is best to try and remove this before the ILR.

I would suggest increasing the oxidizer in the flux and perhaps the silica.  I would test this at a small scale first and play around with the mix.

Regards

 

Todd Harvey - Global Resource Engineering http://www.global-resource-eng.com

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