The problem is that the one with the gold is also made of iron, but I'll look it up on the forum!
Does copper only knock out gold or does it also knock out silver?
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So sulphuric acid isn't necessary if you are using sulfamic acid to denox?
Correct
Hello! I wrote here earlier that I processed a lot of integrated circuits. As a test, I put some iron material in dilute nitric acid (1 liter of tap water and 1 liter of 53% acid). It has been in it for almost 2 weeks, but it hardly dissolved any iron. Why is that? How long does it take to dissolve it? The solution turned blue, which indicates silver. Thanks!
I don't know how long it will take, but blue indicate Copper not Silver.
Silver Nitrate is colorless.
Nitric acid can passivate the surface of iron or steel... for a while. Then the reaction can take off and accelerate. Make sure there is plenty of extra room in the vessel.
Dave
Dave
Hello! Could you help me? I filtered the ar, it contained silver chloride and greenish blue powder. I poured the filtered solution into another container to make sure it was clean and looked clean, then I used urea (I know I shouldn't have, but I couldn't get sulfamic acid) then I dropped the gold with vitamin c and it worked. Now, however, there is a greenish-brown powder at the bottom of my container, and there is something in it that looks like granulated sugar, which is white in color. What can it be and what should I do about it? The gold drop was successful, but I think they could have slipped through the filter paper, which I didn't notice. Thanks!
What solution of AR?
You have been around doing different things, so for us that are all around the forum, it is not easy to keep in control what you have done earlier.
There will be very little Silver Chloride in AR.
You can avoid using Sufamic or Urea by using the Nitric correctly and then add a bit of Copper before Dropping the Gold.
I guess it is some of the Urea or Ascorbic Acid that crystallizes out when the solution cools down.
It can be avoided by filtering everything cold.
After the drop you can wash the Gold powder, with HCl and then water.
Thanks for the answer! I put connectors in the ar, which I didn't take apart, but put them in together with plastic. It also had soldered material in it.
You should have been here long enough to know not to mix solder with Nitric.
Well, you probably was lucky this time, since you didn’t report any filtering issues.
First question:
Was all metallic parts dissolved?
Second:
How did you mix your AR?
Did you heat it?
Third:
Why do you think there was Silver in it?
Everything was resolved. I mixed the aqua regia beforehand, I know it's not supposed to be that way, but in this case I did it this way. I didn't warm it up. I think because I think there was also a silver-plated part in it, but I'm not sure about that.
Silver Nitrate is NOT blue, Copper Nitrate is.
Your white crystals are most likely some Urea derivative, since you had to use much to get the fizzing to stop?
Do not do this anymore.
Stop completely and start reading.
Anything you have started, stop it, and stow it away until you have studied so you understand what you are doing.
Ok???
I had to use a lot of urea. OK, I'll stop. So should I wash what I have now with hydrochloric acid and then with water and get the gold dust?
https://www.google.com/search?q=for...EAiAEAkgEAmAEAsAEP&sclient=mobile-gws-wiz-hp#
That should be safe to do, you will probably need to re refine it at a later time,
but boil it in water and then a good hot HCl wash before a final water wash.
Dry it and store it for later.
Ok and thanks for your help!
I know about the "dangers" of solder. I thought I would refine it twice and add sulfuric acid to save on sulfuric acid. Do you think this is a good idea?
??
So you save sulfuric by using sulfuric?
So why do you plan to use Sulfuric?
Refining twice, I agree with.
And since you did not use Sulfamic I even agree with using a drop or two to remove Lead.
But I don’t see another use of it now.
And I thought the plan was to set it aside until you have studied enough to understand the processes.
