help on stannous chloride
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jimdoc
Well-known member
What are you processing?
Jim
Jim
jimdoc
Well-known member
How much of it, and in what? AP?
Pictures may help?
Jim
Pictures may help?
Jim
jimdoc
Well-known member
jd12586 said:
AP is acid peroxide. It is a work around, or newer trick for not using nitric.
What did you use to put your material into solution?
Jim
jimdoc
Well-known member
If you still have free nitric in solution that is why you still get a positive for gold.
Have you read Hoke's book? I think its on page 44 removal of excess nitric acid.
Jim
Have you read Hoke's book? I think its on page 44 removal of excess nitric acid.
Jim
jimdoc
Well-known member
I don't use urea, you don't need it. Hoke explains how to proceed on page 44 like I said before.
You really should read that book until you understand it before proceeding. You should really explain better what you have done to this point. You said; "they told me that it was a board cover with gold and some gold that they peeled off from a plated"
Does this mean someone else gave you the solution as it is or did you process this? What was this board cover? Were there any metals left in your solution? What are you using to precipitate the gold? It is a lot of guessing for someone to answer you when all the facts are not given. Also a picture of this positive test and solution may help.
You really should read that book until you understand it before proceeding. You should really explain better what you have done to this point. You said; "they told me that it was a board cover with gold and some gold that they peeled off from a plated"
Does this mean someone else gave you the solution as it is or did you process this? What was this board cover? Were there any metals left in your solution? What are you using to precipitate the gold? It is a lot of guessing for someone to answer you when all the facts are not given. Also a picture of this positive test and solution may help.
jimdoc said:
I'm reading it right now. My uncle gave me the bottle that had small pieces board cover with gold and the gold that was peeled out of a plate. I did the process. I will put photo tomorrow morning because I don't have my camera right now. I followed this step:
1.Obtain the correct amount of chemicals and appropriate size containers for the amount of scrap metal you wish to refine. You will need 300 milliliters of container capacity, 30 milliliters of nitric acid, and 120 milliliters of hydrochloric acid for every ounce of metal you intend to refine.
2.Add your scrap materials and the appropriate amount of nitric acid, as mentioned above, to the smaller of your plastic containers. Wait 30 minutes before adding the hydrochloric acid. Let the chemical reaction develop overnight to be sure that all of the gold has dissolved.
3.Filter the particles out of the acid in the plastic container by attaching a Buchner funnel filter and pouring the remaining liquid into the larger of the plastic containers. The resulting acid will be deep green and translucent.
4.Create a urea and water solution by boiling a quart of water and combining it with one pound of urea. Pour this mixture into the acid slowly until no more chemical reaction can be observed. This process raises the pH levels of the acid, thereby eliminating the nitric acid.
5.Heat a quart of water to boiling and add the sodium bisulphite to the boiling water in the ratio of 1 ounce of sodium bisulphate for every ounce of metal being refined. Pour this mixture slowly into the acid and wait for a reaction.
6.Observe the muddy separation that collects at the bottom of the acid container. This substance is pure gold. Extract the gold from the container by pouring off the acid using a filter.
jimdoc
Well-known member
Where did you get those directions? I will have to wait to see some pictures, others may understand what is going on.
Jim
Jim
jimdoc
Well-known member
jd12586 said:
You found the place for trusted knowledge here on this forum, why would you follow instructions you found out there in the world of everybody is an expert (that really isn't) after you found this place?
By going straight to aqua regia you put all metals into solution, that is a problem you should have avoided.
The swab in the picture doesn't look positive to me.
Others will have to give you advice as I am not an expert like a lot of the other guys.
I would like to see a picture of the 21 grams of gold you precipitated.
You probably still have gold in the "stuff that didn't dissolve in the solution"
Jim
qst42know
Well-known member
I have not had such a mess to deal with but I would be tempted to try aqua regia on the solids again.
At least on a sample of them. And then test with stannous. The purple stain from a positive test will not fade or change colors.
At least on a sample of them. And then test with stannous. The purple stain from a positive test will not fade or change colors.
qst42know
Well-known member
I don't see any sign of gold on that swab.
Do you have a standard gold solution to test your stannous?
Do you have dimethylglyoxime (DMG) to test for palladium?
Do you have a standard gold solution to test your stannous?
Do you have dimethylglyoxime (DMG) to test for palladium?
qst42know said:
The first time I test my solution the swab color was black. A day past and I test it again the swab color now is brown. I don't have standard gold solution right now and i don't have dimethylglyoxime. I would like to know if the directions I post are wrong.
