Hi, everyone!
I have read topics on the forum untill my head spins!
I have 15 litres of nitric acid used to recover gold and silver from high grade jewellers filings. I need advice on how to go about recovering the palladium still left in the acid.
Here is the method i used to refign the gold and silver:
1) Melted high grade precious metal filings containing gold, silver, some zinc and some palladium (in the form of 9ct and 18ct white gold filings)
2) Weighed the resuling mixed precious metal bar and added twice the bars weight in copper and melted together
3) Rolled the precious metal containing copper bar to 0.2mm thickness in a jewellers rolling mill and cut to approximately 1.5cm platelets
4) In a deep pyrex dish poured nitric acid over the prepared platelets (approximately 1l nitric acid to 120g of platelets). The concentration of the nitric acid is unknown as i bought it from my local jewellers supply house and the labels on the bottles do not state the acid concentration.
5) After the nitric dissolved the copper completely and the solution cooled i slowly poured the acid into another container leaving the fine gold powder behind. Rinsed the gold powder, dried the powder, added borax and melted in crucible to obtain fine gold ingots.
6) Made a saturated solution of NaCL (table salt) and poured the solution in the left over nitric solution. Silver chloride precipitated and was left to settle for at least 24 hours till the solution cleared. Poured the nitric acid into another container leaving the silver chloride behind. Silver chloride was then treated with NaOH (caustic soda) and concentrated sugar water as per lazersteve's instruction video. The resulting powder was dried, some borax added and melted in a crucible to obtain fine silver ingots.
7) What now? :?
I read on the forum that ammonium chloride can be used to get palladium out of nitric solution and i was able to obtain 1kg of ammonium chloride.
I need some help on the best method to proceed to extract the palladium from the appoximately 15 litres of nitric acid that i have. Any help appreciated!
I have read topics on the forum untill my head spins!
I have 15 litres of nitric acid used to recover gold and silver from high grade jewellers filings. I need advice on how to go about recovering the palladium still left in the acid.
Here is the method i used to refign the gold and silver:
1) Melted high grade precious metal filings containing gold, silver, some zinc and some palladium (in the form of 9ct and 18ct white gold filings)
2) Weighed the resuling mixed precious metal bar and added twice the bars weight in copper and melted together
3) Rolled the precious metal containing copper bar to 0.2mm thickness in a jewellers rolling mill and cut to approximately 1.5cm platelets
4) In a deep pyrex dish poured nitric acid over the prepared platelets (approximately 1l nitric acid to 120g of platelets). The concentration of the nitric acid is unknown as i bought it from my local jewellers supply house and the labels on the bottles do not state the acid concentration.
5) After the nitric dissolved the copper completely and the solution cooled i slowly poured the acid into another container leaving the fine gold powder behind. Rinsed the gold powder, dried the powder, added borax and melted in crucible to obtain fine gold ingots.
6) Made a saturated solution of NaCL (table salt) and poured the solution in the left over nitric solution. Silver chloride precipitated and was left to settle for at least 24 hours till the solution cleared. Poured the nitric acid into another container leaving the silver chloride behind. Silver chloride was then treated with NaOH (caustic soda) and concentrated sugar water as per lazersteve's instruction video. The resulting powder was dried, some borax added and melted in a crucible to obtain fine silver ingots.
7) What now? :?
I read on the forum that ammonium chloride can be used to get palladium out of nitric solution and i was able to obtain 1kg of ammonium chloride.
I need some help on the best method to proceed to extract the palladium from the appoximately 15 litres of nitric acid that i have. Any help appreciated!