Brittle Bars - Pyrometallurgy: Roasting, Smelting, Refining & Calcining + Electrowinning - Metallurgist & Mineral Processing Engineer

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Brittle Bars (1 reply)

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

Todd H

5 years ago

Todd H 5 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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Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

Brittle Bars (1 reply)