Hello guys
Any suggestions welcome.
Recently we have a lot of pins that we refine and we have problems with tin mud. These contacts contain a lot of tin. We dissolve contacts in Nitric acid and extract bigger AU pieces for aqua regia but a lot of gold is still trapped in SN mud. We have big losses in AU on this lot. I have tried to wash mud in hot weather for 5-6 times and leave overnight to wash nitric and salt but some salt still remains and even after that washing for a couple of times when we use HCL to eliminate Tin some AU still converts into solution and we are back on the start. After that we dilute that solution and use ALU foil to drop AU from the solution but AL also drop Tin with rest metals and we are at the beginning of the problem. We tried a couple times and every time is the same problem.
Thanks.
Any suggestions welcome.
Recently we have a lot of pins that we refine and we have problems with tin mud. These contacts contain a lot of tin. We dissolve contacts in Nitric acid and extract bigger AU pieces for aqua regia but a lot of gold is still trapped in SN mud. We have big losses in AU on this lot. I have tried to wash mud in hot weather for 5-6 times and leave overnight to wash nitric and salt but some salt still remains and even after that washing for a couple of times when we use HCL to eliminate Tin some AU still converts into solution and we are back on the start. After that we dilute that solution and use ALU foil to drop AU from the solution but AL also drop Tin with rest metals and we are at the beginning of the problem. We tried a couple times and every time is the same problem.
Thanks.