When gold powder is washed and extracted with hydrochloric acid in a titanium container, a dark purple color appears – will this affect the purity of the gold powder?
Thread Content
When gold powder is washed and extracted with hydrochloric acid in a titanium container, a dark purple color appears – will this affect the purity of the gold powder? Since excessive iron content in gold ingots can occur during the casting process, I would like to discuss this with experts in this field. This post was last edited by laomao123 on 2008-12-16 13:25.]
Excess iron levels can be attributed, in part, to uncleaned molds during melting and ash falling from the flues. Your situation needs to be analyzed specifically, as the reasons vary each time.
Wash the reduced gold powder with hydrochloric acid? We wash it with nitric acid. If the gold powder level is within limits but the gold ingot’s level is not, then it’s a problem that occurred during melting.
Hydrochloric acid is corrosive to titanium, while nitric acid is not a problem~
It seems that nitric acid is generally used for cleaning.