First thing.
I really dislike the usage of the word "should" when it comes to yields... This leads to fixating. IMHO...
cly9412 said:
The next day when I checked the solution all the parts had not dissolved so I poored off the solution and set the undissolved parts to the side and continued the process with what had dissolved.
That's a first sign.
If not everything had dissolved, it'smore then likely the majority of the gold that did dissoved at first, had cemented back.
Heat would probably have prevented that and help dissolve everything at first shot.
cly9412 said:
After pooring off the solution in was dark green just like it has allways been because of the other metals.Then I used a buckner funnle with a hand vacume pump the filter.
That's the point where you need to test with SnCl for the first time.
If positive, values are in solution and
maybe in solid form (
black powder, if not everything had dissolved)
If negative, vlues are in solid form in form, probably in main vessel and in the filter.
cly9412 said:
Once it was filterd I put it into a 3000 ml beaker and heated it up to a light boil.
That's a sure way to lose values in dissolved form.
The De-NOx-ing process refers to a slow evaporation (122-140F) until a syrup like consistency is achieved and re diluting with HCl (repeated twice more).
Urea, in my mind is a sure way to get lost in the process.
To avoid the De-NOx-ing ordeal altogether, add your source of nitrate/nitric incrementally (while the solution is hot) until all metals dissolve.
That way, the exess nitrates/nitric left is negligible and will not bother you further down the process.
cly9412 said:
When I went out the next morning I tested the solution with my SC and it turned a brownish black like there was still alot of gold in it.
In my mind, you are seeing a false positive result.
Have you read this article?
Stannous Chloride – Test For Gold, Platinum and Palladium Presence
Check it out and try to determine what you are seeing in your test.
All in all, i think you have no gold in solution, or very little of it.
If you allow the solution to sit for few days, any gold that had been in solution will thinly coat the bottom of the flask, i see no reason why not.
As to the left over solids (and filter), try and run them again in dilute AR and test with SnCl.