Checking black sand for Au - Gold Refining Forum.com

Checking black sand for Au - Gold Refining Forum.com

 · The best way Ive found to pre-treat sands is to heat them to red heat for at least an hour, in the presence of oxygen, and when cooled, give them a soak in dilute nitric acid. This will free up more from the particles than you realize. Another idea is to the material as far as possible gravimetricly.

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