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[Elektrikis]

@elektrikis, good videos I watched them last week, and have started my first experiments in gold etching with iodine today. I diluted my 10% iodine solution with 5x volume of water, and plan to drop the gold by adding NaOH drop by drop. In your video Im assuming you are using concentrated iodine, and NaOH to drop, could you explain (hoping your english is good enough) Thanks for the vids though .

Be careful with iodine. I've experienced a few explosions. Sodium hydroxide precipitate that all metal hydroxide together with gold.After will be difficult to separate the gold from iodine.Frees iodine dissolved gold again. You must convert all other metal jodides before the precipitated gold. It took me two years and 3 kilograms of iodine waste with 120 grams of gold in it. Now it is my best method.

 

[g_axelsson]

https://www.youtube.com/watch?v=vorIpgzQo6s

Interesting to see iodine leaching, never tried that myself.

But it looks like you are missing out on the gold braze that fastens the chips in the ceramic body on the PPro.
I also think you could work on your technique, it looks quite sloppy, getting iodine with dissolved gold all over the working surface.

Göran

 

[Elektrikis]

https://www.youtube.com/watch?v=vorIpgzQo6s

Interesting to see iodine leaching, never tried that myself.

But it looks like you are missing out on the gold braze that fastens the chips in the ceramic body on the PPro.
I also think you could work on your technique, it looks quite sloppy, getting iodine with dissolved gold all over the working surface.

Göran

I'm afraid of showing the right work surface. These are very old videos. Iodine need a good ventilated place.Kad he starts smelling of hlora.Ir very dangerous.

 

[patnor1011]

How do you recover gold from iodine?

 

[Owltech]

make it acidic - pH about 2-4 then add smb or ascorbic acid

 

[Dieseldawg]

For most people, nitric acid is difficult to obtain and it is very expensive. Most can find HCl at their local hardware store or swimming pool supply store, and it's usually inexpensive.

If there is solder involved, it often contains tin. Tin dissolved in nitric acid makes metastannic acid, a difficult to filter sludge. It slows filtration and can tie up gold in the process.

Dave

How do you turn the sludge to an easier to filter solution ?

 

[g_axelsson]

How do you turn the sludge to an easier to filter solution ?

Incineration and lye is two ways people have dealt with it.
http://goldrefiningwiki.com/mediawiki/index.php/Metastannic_acid

Göran

 

[Elektrikis]

I confirm a Metastannic acid contain gold particles.

https://www.youtube.com/watch?v=qC2LbwmAbTI