Drying Pure Gold Large scale

[Gold.refinery]

Finally, after obtaining pure gold powder, they must be Dried by melting with an induction furnace.
What is the fastest and least risky way to dry pure gold powder?
(on a large scale,for example 20 kg Powder)

Other than an electric oven, is another device recommended?

 

[4metals]

Gold sponge, typically dewatered on a filter to the point where it is not dripping any of the rinse waters used, can be scooped into an induction furnace and dried completely during the melt process.

This assumes the sponge isn’t soaking wet, as I said, not dripping or giving off water when squeezed into a ball. This is easy to do by letting the sponge sit on a filter with the suction applied for about half an hour.

Another caution, use a cold crucible. You do not want to be putting damp sponge into a hot crucible. Also, if at any point the melt is molten, do not add any more to the melt as it will erupt from steam generated. Until you are familiar with doing this the best practice is to load all of the sponge into a cool crucible before starting the furnace.

Actually when melting anything it is never wise to put anything solid into a molten pool of metal.

The gold on the filter pictured was dried in the room by maintaining suction for half an hour and melted.

 

[snoman701]

Go to your local farm store and get an IR heat bulb for chicks. Put it above your buchner funnel.

 

[Gold.refinery]

After filtering the solution in the gold settling stage, if I wash the pure gold powder with ammonia and water, the water from this wash is added to the previously filtered solution, is there a problem or not?

 

[Lou]

I would strongly avoid adding the ammonia back to the gold-free mother liquor.

It may have AgCl and Cu in it, but the ammonia will chelate the copper and prevent easy waste treatment.

 

[4metals]

You are just shooting out questions in no particular order and not getting a complete picture of what you actually should be doing. If you just go back to the beginning, list your process steps taken and show your equipment, you will end up with a much better resolution to your problems.

Right now you are asking people you know with some experience for help and PM’ing members for private instruction and putting together a patchwork of some good some suggestions and some bad. And you don’t know the difference.

For your own good, go back to the beginning and give details. Stop PM’ing and getting mixed advice and get it all out here. Otherwise you will fumble along until you just give up from losing too much of your gold.

Only you can make this decision.