Noxx
Well-known member
High karat gold can not be dissolved directly in AR. For this reason, there are a few techniques that can be used directly on this alloyed gold. Some use acids some don't.
The following post will show a few methods I know. The list is not inclusive, please help me to complete it.
Wet Methods
Inquartation
This method has been widely discussed in other threads. It consist of alloying your gold with silver down to about 30% gold by mass. Gold is poured in water to make flakes then based metals are dissolved in Nitric Acid. Resulting gold powder rages from 98%-99.5%
Pros
-Relatively fast process.
-Silver is recovered.
Cons
-Releases NOx
-You need to melt and pour metal.
Electrolytic Methods
Karat Cell (NH4Cl, Shor?)
This method uses an electrolyte (NH4Cl) to complex silver and copper, thus preventing their precipitation.
Pros
-Low operation costs
-Good purity (98%-99%)
-No toxic fumes
-Quite fast
Cons
-The cell may need cooling if you use a lot of amps
Karat Cell (HNO3, modified by Noxx)
This method is the same as above but it uses diluted HNO3 (30%) as a electrolyte. The other modification consists of addition of H2O2 or Urea to to limit NOx emission and increase efficiency. Your HNO3 gets close to 2 times its dissolution power.
Pros
-Good purity (99%-99.5%)
-No NOx fumes.
-Quite fast.
-Two times as efficient as a standard HNO3 cell.
Cons
-Reagent costs
-May need cell cooling.
----------------------
Please help me complete this list.
The following post will show a few methods I know. The list is not inclusive, please help me to complete it.
Wet Methods
Inquartation
This method has been widely discussed in other threads. It consist of alloying your gold with silver down to about 30% gold by mass. Gold is poured in water to make flakes then based metals are dissolved in Nitric Acid. Resulting gold powder rages from 98%-99.5%
Pros
-Relatively fast process.
-Silver is recovered.
Cons
-Releases NOx
-You need to melt and pour metal.
Electrolytic Methods
Karat Cell (NH4Cl, Shor?)
This method uses an electrolyte (NH4Cl) to complex silver and copper, thus preventing their precipitation.
Pros
-Low operation costs
-Good purity (98%-99%)
-No toxic fumes
-Quite fast
Cons
-The cell may need cooling if you use a lot of amps
Karat Cell (HNO3, modified by Noxx)
This method is the same as above but it uses diluted HNO3 (30%) as a electrolyte. The other modification consists of addition of H2O2 or Urea to to limit NOx emission and increase efficiency. Your HNO3 gets close to 2 times its dissolution power.
Pros
-Good purity (99%-99.5%)
-No NOx fumes.
-Quite fast.
-Two times as efficient as a standard HNO3 cell.
Cons
-Reagent costs
-May need cell cooling.
----------------------
Please help me complete this list.
