Sure simply atomize pure silver! :lol:
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Urea, its use in refining
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HAuCl4
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Next time I have a chance with this alloy and solution of nitrates, I'll try ultra fine pure silver foil in a shaker to cement Pd and Pt, before filtering and retrieving the silver.4metals said:
Why is HCl better for dropping the silver chloride, than NaCl or KCl in powder form?. One would have less liquid and much less nitric acid, that's an advantage that I can clearly see?. :?:
kuma
Well-known member
Hello all , how are tricks today?
I hope all is well!
I was looking for information on a different subject this morning , and I came across the following (link) and remembered this thread , thinking that someone was looking for silver powder.
(I also found some of the information in the Datasheets section quiet interesting) ;
http://heraeus-thickfilm.com/en/productsapplications/preciousmetalpowders/precious_metal_powders_1.aspx
http://www.natureer.com/uploadfile/201012/26/0E213240437.jpg
All the best everybody , and kind regards ,
Chris :mrgreen:
I hope all is well!
I was looking for information on a different subject this morning , and I came across the following (link) and remembered this thread , thinking that someone was looking for silver powder.
(I also found some of the information in the Datasheets section quiet interesting) ;
http://heraeus-thickfilm.com/en/productsapplications/preciousmetalpowders/precious_metal_powders_1.aspx
I did find this image of fine Ag powder ;samuel-a said:
http://www.natureer.com/uploadfile/201012/26/0E213240437.jpg
All the best everybody , and kind regards ,
Chris :mrgreen:
4metals,
I had very good success with Pt and Pd after eliminating the nitric with sulfamic. The AR contained up to 50% nitric and, therefore, it ended up with lots of sulfuric and little HCl.
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Concerning black silver powder. In general, for any metal I have seen, the smaller the particle size, the darker the powder. I think that it has to do with our sight limitations of reflections. I would experiment with different reductants at different solution strengths, reductant strengths, temperatures, etc. However, I have only seen very dark silver a few times and I can't remember the conditions. Most is medium gray or whiter.
With gold, it is different in that a range of shades - from light tan to black (to colloidal pink/purple) - are fairly common. Although dark gold powder often indicates low purity, it can also be due to particle size.
I had very good success with Pt and Pd after eliminating the nitric with sulfamic. The AR contained up to 50% nitric and, therefore, it ended up with lots of sulfuric and little HCl.
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Concerning black silver powder. In general, for any metal I have seen, the smaller the particle size, the darker the powder. I think that it has to do with our sight limitations of reflections. I would experiment with different reductants at different solution strengths, reductant strengths, temperatures, etc. However, I have only seen very dark silver a few times and I can't remember the conditions. Most is medium gray or whiter.
With gold, it is different in that a range of shades - from light tan to black (to colloidal pink/purple) - are fairly common. Although dark gold powder often indicates low purity, it can also be due to particle size.
You hit the nail on the head Chris. Cruddy gold is usually very fine while really high quality gold is spongy and very light in color.
I believe this is best described with statistical mechanics (like any nucleation theory). I'd be glad to get more into it if y'all are keen on hearing my thoughts.
I will take some photographs of crappy gold and really nice gold under the electron microscope.
Really nice gold rinses well. Really crappy gold doesn't. Pore structure and relative surface area to volume ratios must be at play.
I believe this is best described with statistical mechanics (like any nucleation theory). I'd be glad to get more into it if y'all are keen on hearing my thoughts.
I will take some photographs of crappy gold and really nice gold under the electron microscope.
Really nice gold rinses well. Really crappy gold doesn't. Pore structure and relative surface area to volume ratios must be at play.
The moderators would like to thank all of the members who contributed to the original thread that this post was based on, as well as those who asked questions showing what was missing. Because of the extra length and interest in this thread we have created the above, consolidated version making for an easier read. We encourage all members to read, comment, and ask questions in the original thread, Urea, its use in refining.
The moderators have edited some posts in this thread that made reference to posts that were deleted. We strive to make these Library threads as concise as possible by deleting posts that do not add information to the original topic. All of the original posts are still preserved in the thread listed above.
The Library threads should not be considered to constitute a complete education. Instead, they're more like reading a single book on the subject of recovery and refining. There is so much more information on the forum, and it is impossible to include it all in these condensed threads. Members are strongly encouraged to read the rest of the forum to round out their education.
The moderators have edited some posts in this thread that made reference to posts that were deleted. We strive to make these Library threads as concise as possible by deleting posts that do not add information to the original topic. All of the original posts are still preserved in the thread listed above.
The Library threads should not be considered to constitute a complete education. Instead, they're more like reading a single book on the subject of recovery and refining. There is so much more information on the forum, and it is impossible to include it all in these condensed threads. Members are strongly encouraged to read the rest of the forum to round out their education.
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