Mikestaf35 said:
Hi and thank you kadriver for you video very informative, but can I ask a few questions again sorry I am a newbie and just trying to learn.
You mention your stock pot, full of copper to cement out the precious metals from the waste, how does this work and can you reuse the ap solution again ?
You rinse the gold flakes with hydrochloric acid what does this do?
Is there a specific amount of sodium metabisulfite to add
What do you add to the gold and the filter and what does it do when smelting and does it alter the purity of the gold
What does the molten borax do
Thank you again
Hello, welcome to the forum
I just posted a new video showing my stock pot, its in this forum - tutorials - entitled "The Stock Pot"
click here - it's at the very end of the thread: http://goldrefiningforum.com/phpBB3/viewtopic.php?f=52&t=21273
I put all my gold refining wastes into my stock pot.
If there are trace amounts of platinum group metals then they will cement out onto the copper in the stock pot and accumulate there, instead of trying to precipitate 1/10 gram of platinum that happened to be in with my gold, I let the stock pot do it for me.
I do jewelers waste and there is always some platinum and palladium there, but too little to recover and refine. The stock pot gets it for me.
I think you can re-use the AP, but my AP solution was brown and loaded with junk, and there was so little of it that I just added to my stock pot.
The HCl rinse will remove some contaminants that water wont (not sure what they are) so just to be safe I rinsed the foils with HCl.
If you are good at chemistry then you can calculate the amount of SMB needed per the amount of gold you expect. I have NO chemistry training at all, so I just add until the solution looks barren (all the color is gone) or until the foam (if present) turns white instead of yellow.
In this video I added some borax out of the box during the melt. As it melts it holds the paper in the dish so i can completely burn the paper until it completely disappears. The paper has tiny bits of gold and they could fly out of the dish from the force of the flame impinging on it. The molten borax glues the paper in the dish so I can burn it and keep those tiny balls of gold in with the main melt.
The paper does not affect the purity or the appearance of the resulting gold - it completely disappears in the melt. My gold, melted in this way, always assays 999. Plus the bars look beautiful.
Hope this helps
kadriver