gaurav_347
Well-known member
- Joined
- Nov 17, 2013
- Messages
- 169
Hello All,
I hope all of you are doing well. I have been facing some issues treating foils in AR. The problems are as follows :-
So at the moment I am processing Rams around 50 kgs. I recovered 4.2 kgs of clean cut fingers. I treated these fingers in dilute nitric acid to release the foils. Then I filtered the solution to get the foils. I was trying to dissolve these foils in AR but it wouldn't dissolve. While preparing the aqua Regia before treating the foils there was a strong reaction when nitric acid was being added to hcl. Like a strong/violent fizzing reaction. Secondly the foils won't dissolve in this AR. I tried to give it excess heat but still it won't. I have always used lab grade acids in the past to recover and refine the gold. This time I am using commercial grade acids. Could someone give their insights as to what is happening. I also performed a stannous test after one hour of treating these foils in AR but the tests came negative. The foils are still at the bottom of the SS reaction vessel. I might be wrong but I believe one of these acids have lost their potency.
I hope all of you are doing well. I have been facing some issues treating foils in AR. The problems are as follows :-
So at the moment I am processing Rams around 50 kgs. I recovered 4.2 kgs of clean cut fingers. I treated these fingers in dilute nitric acid to release the foils. Then I filtered the solution to get the foils. I was trying to dissolve these foils in AR but it wouldn't dissolve. While preparing the aqua Regia before treating the foils there was a strong reaction when nitric acid was being added to hcl. Like a strong/violent fizzing reaction. Secondly the foils won't dissolve in this AR. I tried to give it excess heat but still it won't. I have always used lab grade acids in the past to recover and refine the gold. This time I am using commercial grade acids. Could someone give their insights as to what is happening. I also performed a stannous test after one hour of treating these foils in AR but the tests came negative. The foils are still at the bottom of the SS reaction vessel. I might be wrong but I believe one of these acids have lost their potency.