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Post by philski on Jun 26, 2012 23:24:12 GMT 10
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daveo
New Member
Posts: 6
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Post by daveo on Jul 1, 2012 7:30:20 GMT 10
Thanks for the link Phil. Seems like panning is not the only way of liberating that fine gold from the dirt ehwhat! Especially the fine stuff that may be in with other minerals also eg pyrite etc. Am interested in the Nitric acid(aqua regia) method of extraction and refining especially for sand. Some very good info and demos out there. Great to see so many covered in one publication. Next plan the supplies and equipment! Great hobby covers a lot of science also! Thanks Daveo
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Post by philski on Jul 1, 2012 14:19:08 GMT 10
I use Aqua Regina. Simple and effective with a high purity. Dissolve all the metallics in solution and strain, keeping the liquid. i only break out 2 things, silver and gold. But you can drop lots more. First you drop your silver out of solution with Sodium Chloride "pure salt". as you sprinkle it in it forms silver chloride. Then strain the Silver Chloride precipitate with a fine plastic strainer into glass. Keeping the Acid you strained, Next Sprinkle in sodium Meta BiSulphate to form Gold BiSulphate. Strain and neturalize the acid and dispose of in a safe manner. Its quite nasty stuff. The acids need to sufficiently high 38%+ for nitric and 80%+ for hydrochloric from memory..
Dry your goodies and mix with borax and smelt. If you dissolve it twice you get close to mint purity. 999
they also use cyanide a lot. but that kind of scares me more than Aqua Regina.
*warning, Please use the utmost care and common scene. this method uses hazardous acids mixed together. The importance of ventilation and a safe and effective work flow can not be stressed enough.
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