Instructables

Step 6: Using Borax with your Salvaged Gold

Picture of Using Borax with your Salvaged Gold
Gold 11b.JPG
There are basically two methods of melting gold flakes and dust to recover gold available to the average person, the mercury method called Gold-Mercury Amalgam with its obviously toxic by-products and the Borax Method.

I do not recommend the mercury method it works but it is extremely toxic for generations.

The Borax Method is a technique of artisanal gold mining, with its basis in the principle that borax reduces the melting point of all minerals, including precious metals like gold. The melting point of gold is 1063 ˚C, which is a higher temperature than can be obtained by cheap torches and burners. By adding borax to the heavy mineral concentrate, the melting point temperature decreases, allowing people to melt gold out of their concentrate and salvage. By using borax, no mercury flour is produced, and gold recovery increases.
evchim11 months ago
If you could produce a high enough temperature, would you need all the other steps or could you just put the raw e-waste in and let the non-gold/silver burn off?

I'm just wondering because there is an instructable for a cheap homemade electric kiln that they say reaches 2000F ~ 1093C and should be enough heat to melt the gold.
Josehf Murchison (author)  evchim11 months ago
That should be hot enough to melt the gold and for cupellation, it would also produce a lot of ash to lose the gold in if you just loaded it with scrap electronics. The melted borax acts like flux lowering the melting point and sticks the flakes together so they don’t get lost.
Ah! Thanks :)