Why Red Aqua Regia ??

spoke27

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I come Back..
And This Subject Show End.
if your AR is Red then u msut be close your ear.. you must be open your eyes..

Ty Dr. Lin and others..
 

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spoke27

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DMG Salt
WhatsApp Image 2021-10-23 at 12.46.30.jpeg
XRF result for DMG Salt (this Xrf using for buy cat )
WhatsApp Image 2021-10-23 at 12.46.07.jpeg
and ICP result
248682429_450490756649765_9071364731956698245_n.jpg
this ICP result not explain Why Acid Red.. Why so hard to disolve ..

And also Not explain why DMG give me salt and why XRF show some PM
TY for all Answears
 

olawlor

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Jul 11, 2016
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Could the red color in solution be a polysulfide? The ICP results show >10% sulfur, and polysulfides in solution have that same rich orange-red color. See, for example, NileRed dissolving sulfur, making an (alkaline) polysulfide solution:

If the red color is polysulfides, then the precipitate could just be sulfur, which crystallizes out of some polysulfide solutions.

This is 100% theory. Has anybody dissolved pyrites in aqua regia and gotten a similar result?
 

FrugalRefiner

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If you got that by premixing HCl and HNO3, you should spend some time studying the forum. We advise against premixing AR. You are better off adding the HCl you feel you will need / enough to cover your feedstock, then adding the nitric in increments.

Dave
 

galenrog

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Ok. What did you do to get there? Unless we know what you did, then how can we help you. Please be detailed. Time for more coffee.
 

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