Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

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How to process silver gold amalgam with acids (1 reply)

A
7CHEESE8
1 month ago
7CHEESE8 1 month ago

I have refined gold with ar with success. I have gold silver amalgam that I'm not sure what the steps are to separate the metals.  Gold and silver amalgam come from where I'm working. I started by retorting the amalgam. I'm guessing a nitric bath. The solution turned black. Rinse with distilled water with a little heat. I'm honestly not sure what to do with this. Please help! 

J
Jorge
4 weeks ago
Jorge 4 weeks ago

It is important to eliminate the mercury by distillation. The product containing silver should be ground, approx. 80-90% passing 200 mesh. Then, dry the material to evaluate the effect of hot nitric acid on silver dissolution.

- You can try different temperatures (e.g. 50, 75, 90 oC).

- Nitric acid strength is other variable to consider, a good starting point is 40% w/w, based on the result you can try 60% w/w or higher concentration.

- Solid/Liquid ratio, 1/3, 1/4, 1/6

The optimum parameters will product a pregnant solution, which can be treated by cementation with copper to precipitate silver.

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