Hi!
I could not find a topic to this subject, so I generated a new one.
If the mods have a better spot for this post, please do advice so it can be moved.
I came a cross a metal core catalyst.
During my readings on the big wide web I came to the conclusion that it was most likely of Kanthal.
Since Kanthal is a Chrome, Iron and Aluminum alloy, I decided to try dissolving the matrix in HCL.
This would have the benefit of leaving the potential PGMs as metal and not in solution,
as well as using cheap HCl.
But after prolonged leaching I still was left with a much more and voluminous residue than expected.
So I suspected that it might be another alloy which had some pacification issues.
This put me in a kind of squeeze since I didn't like the idea of sulfuric acid yet.
Sulfuric would maybe dissolve Rhodium if present. And nitric would attack Palladium and Platinum if present.
I'm not set up for proper roasting either yet, it is on its way
It is comprised of a very fine fluffy grey sludge and some coarser gritty residue in a mix.
It seem that this residue will weigh in around 1 kg when dried.
I finally caved in, and extracted a couple of grams residue and added fresh HCl and a few milliliters nitric acid.
This is my first use of AR on a metal expected to react with AR.
So I expected a relative active reaction because of the fine powder and the concentration of acids.
But to my surprise there was no visible reaction at first, no bubbles and no fumes.
The reaction is at room temperature.
After a while the mixture turned brownish and then bright red, but still no bubbles and fumes
HCL is 36% and fumes and the nitric is 65% and fumes as well.
I really expected both bubbles and fumes.
So now I will dry it completely and take a sample that is weighed and repeat this, then weigh it after.
With the respect to color of solution and stannous test, I suspect Platinum and not much Palladium.
There seem to be some precipitation of some kind too.
My plan now is to leach out as much as I get from the sample and then cement it out with copper.
Then leave the rest of the sludge in metallic form for later.
I'm not quite set up to do much PGMs yet. That was why the base metal leaching looked appealing.
Does anyone have a explanation why the AR didn't evolve neither smoke nor bubbles?
Micro bubbles?
It does the job though
I could not find a topic to this subject, so I generated a new one.
If the mods have a better spot for this post, please do advice so it can be moved.
I came a cross a metal core catalyst.
During my readings on the big wide web I came to the conclusion that it was most likely of Kanthal.
Since Kanthal is a Chrome, Iron and Aluminum alloy, I decided to try dissolving the matrix in HCL.
This would have the benefit of leaving the potential PGMs as metal and not in solution,
as well as using cheap HCl.
But after prolonged leaching I still was left with a much more and voluminous residue than expected.
So I suspected that it might be another alloy which had some pacification issues.
This put me in a kind of squeeze since I didn't like the idea of sulfuric acid yet.
Sulfuric would maybe dissolve Rhodium if present. And nitric would attack Palladium and Platinum if present.
I'm not set up for proper roasting either yet, it is on its way
It is comprised of a very fine fluffy grey sludge and some coarser gritty residue in a mix.
It seem that this residue will weigh in around 1 kg when dried.
I finally caved in, and extracted a couple of grams residue and added fresh HCl and a few milliliters nitric acid.
This is my first use of AR on a metal expected to react with AR.
So I expected a relative active reaction because of the fine powder and the concentration of acids.
But to my surprise there was no visible reaction at first, no bubbles and no fumes.
The reaction is at room temperature.
After a while the mixture turned brownish and then bright red, but still no bubbles and fumes
HCL is 36% and fumes and the nitric is 65% and fumes as well.
I really expected both bubbles and fumes.
So now I will dry it completely and take a sample that is weighed and repeat this, then weigh it after.
With the respect to color of solution and stannous test, I suspect Platinum and not much Palladium.
There seem to be some precipitation of some kind too.
My plan now is to leach out as much as I get from the sample and then cement it out with copper.
Then leave the rest of the sludge in metallic form for later.
I'm not quite set up to do much PGMs yet. That was why the base metal leaching looked appealing.
Does anyone have a explanation why the AR didn't evolve neither smoke nor bubbles?
Micro bubbles?
It does the job though