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Jun

How are gold bars made from scrap gold?

Posted by admin as Gold Bars

Hello,
I was wondering how gold bars are made from scrap gold. I understand that the gold is melted and poured into a mold, but how are the other metals besides gold seperated so that the resulting bar is pure? Or do the companies just melt everything and sell a bar of the corresponding karat (ex. 14/18/24kt bars)? Thanks

all metals have different melting points. If the scrap gold is heated. Anything that melts before it reaches that temperature is removed, because it is not gold. Anything that remains solid once all the the gold has melted is also removed because that is not gold either

Geology Rock Star says June 15th, 2010 at 9:11 am

all metals have different melting points. If the scrap gold is heated. Anything that melts before it reaches that temperature is removed, because it is not gold. Anything that remains solid once all the the gold has melted is also removed because that is not gold either
References :
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Martin says June 15th, 2010 at 9:43 am

Adding to what Geology Rock Star says, those different materials have not only different melting temperatures, but also different densities. The less dense ones will float atop the molten gold and can then be carefully poured off.
References :

Tommy Jvanick says June 15th, 2010 at 10:33 am

The gold is melted and the other metals are skimmed from it, until it is roughly 99.9% pure gold
References :

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