After cutting up a few circuit boards to remove the precious gold bearing parts, Josehf threw these parts into a mixture of muriatic acid and hydrogen peroxide. Gold melts at 1064 ˚C, much hotter than what can be obtained by a simple propane torch.
two parts muratic acid to one part hydrogen peroxide. after the Peroxide has been added to your muratic acid the mixture should start to bubble, and the base metals should begin to dissolve. At this point you should be wearing your safety gear because a few unfriendly fumes are being released.
Hydrogen peroxide is used in the mining industry for the extraction of precious metals such as gold, platinum, and palladium. Gold extraction from natural sources, including gold rocks and gold ores, can be done by leaching the gold concentrate or crushed gold rocks, in a solution of hydrogen peroxide and hydrochloric acid. By using hydrogen peroxide, the extraction of gold is reasonably economical and eco friendly compared to other extraction methods.
read full article here
Less dangerous way of refining gold