kadriver
Well-known member
Here's a video showing how I convert silver chloride with lye and sugar to pure silver metal
https://youtu.be/mqYVOT-WybE
Thanks!
kadriver
https://youtu.be/mqYVOT-WybE
Thanks!
kadriver
goldenchild said:kadriver,
Did you ever take a sample of the powder after rinsing and just melt it as is for testing? I get 4 9's from the chloride method alone. You may find that the cell is just an extra step.
Lou said:Here is another method I find gives 99.9% Ag without the cell.
Take freshly precipitated silver chloride known to be free of lead (sulfuric acid addition to generating liquor)
Lou said:Yes. You can use any soluble sulfate to remove lead. You need not add much or you'll end up with mostly silver sulfate contaminated with lead sulfate. Done right, just cupel it for silver trace. That silver chloride should be digested with dilute Aqua regia before or after the sulfate treatment. The acidic dilute HCl was of the chloride helps keep it from peptizing. After that it can be made into silver powder via the Kundu carbonate method. In no instance should it be directly melted with excess NaCl. Using K carbonate helps make a low melting eutectic for better performance.
The nitre/borax rinse homogeneously coats the silver metal and as it melts the nitre oxidizes and base metals (and Pd) get dissolved in the borax. The end product of nitre is NOx and sodium oxide (doesn't hurt the silver).
This rinse solution can be used over and over til it's gone.
The nitre/borax rinse homogeneously coats the silver metal and as it melts the nitre oxidizes and base metals (and Pd) get dissolved in the borax.
Lou, I think I can speak for everyone in thanking you for every one of those pro tricks you've shared with us! I know you have to walk a line between sharing with us, and giving away too much proprietary information. 8)Lou said:Yep. That was a pro trick. Glad to see it work for you
I'm still rinsing the NaOH out of that silver two days later. I rinse with about a gallon of hot tap water and let it settle. Then I siphon off to another 5 gal bucket and rinse the silver powder again. I repeat until I get between 6 and 7 pH. My tap water is slightly acidic. But I learned early on to get all the NaOH out before I go any further.
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