damocles said:Hello To all,
Thank you for the details Göran.
But on any doc I did read they always say AR need to be done 3:1.
So for example 75ml HCL 25ml Nitric
so in this example you say I need to use same quantity of HCL but less nitric acid ?
I also saw that trinity gold recovery channel and believe his approach brings a waste of chemicals. I also believe he wasting gold along the way but I do not know how.Yes, hydrochloric and nitric acid is consumed in the rate of 3:1 when dissolving gold and a rule of thumb is that it takes about 1 ml nitric to dissolve 1 gram of gold. (Actually with reflux you could go as low as 0.6-0.7 ml/g)
As you know an excess of nitric acid needs to be removed before precipitating the gold. But an excess of HCl doesn't hurt and is even necessary when using SMB. Nitric is also difficult to get and expensive for most people, so therefore the recommendation is to add enough HCl to complete the reaction or cover the objects and then add nitric as needed. It is cheaper, creates less waste and makes it easier to get back the gold in the end. The drawback is that it might take some more work and a bit more time.
There is a guy on youtube right now, I think his channel is called Trinity refining or something like that and he could add a liter of nitric to dissolve 10 grams of gold. He creates huge amounts of waste and consumes a lot of chemicals and my only comment to his videos is "Why!!!". It's so wasteful and according to my calculations he is also losing gold.
You should also study "stock pot" and "cementing", it will reveal the answer on your question about copper.
Göran
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