Please remember that RECOVERY and REFINING are two totally different processes.
With escrap, and with many other forms of gold scrap, the gold must first be RECOVERED from the scrap before it can be REFINED to high purity gold.
In this video, RECOVERY is the process of separating the gold from the circuit card material that the gold foils cling to.
SREETIPS used hydrochloric acid and hydrogen peroxide with an aquarium bubbler to RECOVER the gold foils so that those foils could be REFINED in later steps.
After the gold foils were lifted from the circuit card fingers by the action of the the air bubbling through the hydrochloric acid and over-the-counter 3% hydrogen peroxide, I collected all the foils in coffee filters - at this point the RECOVERY process is complete.
Now SREETIPS proceeded to the REFINING of the RECOVERED gold foils.
REFINING is the process of
1) dissolving the gold foils
2) filtering out insoluble material
3) then reconstituting the gold out of solution with a chemical precipitant.
In this video SREETIPS used sodium metabisulfite. Sodium metabisulfite, when mixed with the chloroauric acid (dissolved gold) produces sulfur dioxide gas. The gold atoms in the chloroauric acid have an affinity for the sulfur atoms in the gas and they begin to cling to the sulfur atoms, but they don't bond chemically. At some point the gold gets too heavy and falls (precipitates) out of solution.
When this happens then the REFINING process is complete.
Have a great day .
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