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- Aug 12, 2021
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For cleaning up pins, you should do the following;Sorry it was 40 grams of pins I put into the nitric first. I didn’t weigh the yield after the nitric and base metals. I gotta get better at describing things and details.
1. Put in a beaker, not a Mason jar, with secondary containment. If that jar breaks, you will have a spill.
2. Add HCL to dissolve whatever metals are soluble in that acid. Wash with distilled water in between HCL additions, until all reactions stop.
3. Boil with distilled again, and possibly again, until all HCL is removed.
4. Then add Nitric, and repeat, until all reactions have ceased. Wash, wash, wash.
5. Now you can add the HCL, just enough to cover material. Add Nitric with an I dropper. Add until Au is dissolved. This can take a while, do not get in a rush, or you will over use the Nitric. A little heat will speed the reaction. This should be done in a secondary containment, with a beaker. If you use the Mason jar, this is where you are likely to have a spill.
6. Now de NOX with Sulfamic, while solution is warm.
7. Cool with distilled ice cubes
8.Filter solution to remove any particles.
9. Drop with SMB.
10. Check solution with Stannous to insure all Au is removed with SMB.
11. Wash powders with HCL, then distilled a couple times.
12. Melt in dish with torch, and pour into desired mold.
Forgot to mention the addition of a couple drops of Sulfuric during step 5, to drop any Lead.
By now you will see that you have quite an investment in time, chemicals, lab ware, torches, molds, Etc. Not to mention a fume hood.
I understand the interest in what you are doing, but unless you want to continue this, you should invest in the proper stuff.
As Kurtak said, you are currently operating at a loss, and doing this dangerously. As Yddrasil said, you have a lot of studying. Please do so. A crash course in this , would be to watch some Sreetips videos. Even he is working with just enough to do it safely, and efficiently.