eagle2
Well-known member
Hi Steve: Thank You.
I have gone to your site, but unfortunately I am still running Windows 98se. (don`t like XP. eventually I guess I`ll be forced into it.) Media player 11 doesn`t support 98se.
On the HCl- Cu-Peroxide process, I have used this successfully many times, already, to dissolve the base metals and leave the gold intact. I just use enough peroxide to start the process and as the Cupric in solution builds up, just enough peroxide to remove the Cuprous. The HCl is only about 2-4 molar. My solution is heated to near boiling and this works on a batch of unpopulated pc boards in about an 30-60 minutes. Basically its a Copper leach and anything below Copper in the EMF series should not be dissolved.
Some Gold does dissolve, because of the peroxide, but I believe I have recovered most of it it by cooling my excess solutions to room temp. and adding a small amount of Zinc. All I see is traces anyway. There`s a Patent online that describes this similar recovery method and his work shows around 95-99% recovery.
What I don`t know is were Palladium lies in the EMF series, If its below Copper, it shouldn`t dissolve. My Chemistry books don`t list it. I`m going to try to Google it now.
Al
I have gone to your site, but unfortunately I am still running Windows 98se. (don`t like XP. eventually I guess I`ll be forced into it.) Media player 11 doesn`t support 98se.
On the HCl- Cu-Peroxide process, I have used this successfully many times, already, to dissolve the base metals and leave the gold intact. I just use enough peroxide to start the process and as the Cupric in solution builds up, just enough peroxide to remove the Cuprous. The HCl is only about 2-4 molar. My solution is heated to near boiling and this works on a batch of unpopulated pc boards in about an 30-60 minutes. Basically its a Copper leach and anything below Copper in the EMF series should not be dissolved.
Some Gold does dissolve, because of the peroxide, but I believe I have recovered most of it it by cooling my excess solutions to room temp. and adding a small amount of Zinc. All I see is traces anyway. There`s a Patent online that describes this similar recovery method and his work shows around 95-99% recovery.
What I don`t know is were Palladium lies in the EMF series, If its below Copper, it shouldn`t dissolve. My Chemistry books don`t list it. I`m going to try to Google it now.
Al