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Refining gold: help needed


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Hey all,

I recently smelted and refined my gold into a gold bar. I used my newer electric furnace set at 2000 degrees Fahrenheit. I let it smelt for about 30 minutes in a graphite crucible. Using equal amount of borax to gold ratio with adding a small amount of soda ash. Twice I refined and came up with a scratch test of about 16K gold after breaking off the slag and cleaning the bar into a nice shine through many different cleaning processes. Is there anything else can you suggest I add or refine differently to gain more purity. I do not want to go into various types of liquids. Just smelting and refining. I would appreciate any help. Thanks beforehand.--Jim

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I'm no expert on this but from what I know, I don't believe so.

You'd have to use aqua regia to dissolve the bar  then precipitate the gold out using a reagent. That's what I've always done but perhaps the methods have changed since then.

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Ah ... I misunderstood. Smelting is the process of heating ore to extract the free metals contained in those ores. I think you are not so much smelting as melting your gold.

Is your intent to remove the other metals from your gold to make a 24K (pure) gold bar?

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19 minutes ago, clay said:

Ah ... I misunderstood. Smelting is the process of heating ore to extract the free metals contained in those ores. I think you are not so much smelting as melting your gold.

Is your intent to remove the other metals from your gold to make a 24K (pure) gold bar?

Yes Clay, it's melting it is then. I wasn't sure. Indeed, I'm trying to get more purity or as close to 24K as possible.

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