Refining Scrap Jewelry into a Gold Bar with KMG Gold Recycling, BBB Award Winning Gold Buyer
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Refining Scrap Jewelry into a Gold Bar with KMG Gold Recycling, BBB Award Winning Gold Buyer
The powder added to the melt depends on the quality of the metal going into the crucible and the type of crucible being used. Borax flux can be used in graphite and silicon dioxide crucibles. Borax simply cleans the metal and removes some impurities. Boric acid may be used with borax in graphite & silicon dioxide crucibles to remove impurities and float stones and c-clasp springs. Soda ash may be used with borax to oxidize impurities. Soda ash can ONLY be used in silicon dioxide crucibles. - od kmggold
There are three different fuxes we use when melting gold and silver. Borax, boric acid, and soda ash. The powder in this video is soda ash. Flux is used to dissolve oxides when melting impure gold. - od kmggold
Really helpful video,, so the borac acid is for? - od GIOSER2105
The first step in refining scrap gold is "secondary" refining process. Jewelry is melted and the alloyed metals with a lower boiling point than the liquid temperature of gold boil off. Such as tin and zinc. Soda ash is added which floats small stones and steel springs from jewelry and forms a crust on top of the ingot which is easily removed. Secondary refining yields an ingot of predominantly copper gold and silver. Gold can be purified the Miller method, Wohlwill process, and acid parting. - od kmggold
This ingot was made from mixed karat scrap gold and the final purity was around 46% gold, some silver and copper. - od kmggold
How pure is the gold? - od mounlasy
sir what powder did you add please help me out - od Farooq Shera
Hi, these furnaces are powered by natural gas. The powder we add is soda ash. This bonds to non-precious metal elements, stones, small steel c-clasp springs etc. The soda ash then floats to the top on the molten gold with these impurities and once poured, cools as a black cake that is easiliy knocked off with a hammer leaving the final ingot which is predominantly copper, gold, and silver. Thanks for your comments! Mike - od kmggold
what kind of power did you put in when burning the gold - od Michael allen