Gold Refining - Precipitating gold out of Aqua Regia 2

[LongBean420]

@indeeditdoes

the screws as a anode and cothode

[LongBean420]

@indeeditdoes hello just off the topic a little, im trying something i added electrochemistry to a dirty muriatic acid and peroxide solution and on one of the drywall screws there seems to be a build up of something like a brownish slim would that be copper or gold or a mix of everything?

[indeedItdoes]

@LongBean420

The gold would stay out of solution as brwon or black powder

[LongBean420]

@indeeditdoes i added some SMB to a dark mix of muriatic acid and clorox and at the bottom its like a whit paste, what do you think this might be?

[indeedItdoes]

@LongBean420

Probably Cupper (I) Chloride...

Siphon the solution and cover the solids with fresh HCl, it should dissolve and produce a yellow solution.

[Arnold34251]

so does this liquid actually produce real gold???

[indeedItdoes]

@Arnold34251

This liquid is actually gold, bot at it's elemental form, but in ionic complex with chlorine and hydrogen.

[Arnold34251]

@indeedItdoes i bet its pretty expensive than lol

[gourp]

Will this also drop copper? What can you do if there is a lot of dissolved copper in the AR along with gold.

[indeedItdoes]

@gourp

SMB does tend to produce Copper (I) salts (off white solid) if found at large amounts in solution.

A further HCl wash will get rid of it.

[indeedItdoes]

@gourp

yes, Cupper (I) Chloride tends to co precipitate along side gold.

Depends on the concntration and temp' of solution.

The CuCl can be dissolved later with HCl.

[GingleGangle1]

What did u put in it?

[VexingRandomness]

the descirption says "One can see clearly the SO2 gas beeing dissolved and in turn pushing the gold out of solution." How do you dissolve a gas in a liquid? seams strange....

[indeedItdoes]

Hi there.

perform a search on google with the term: "gas dissolution in liquid"

or "Solubility" on wikipedia.

This will help you understand the term.

If you wan't to be real thorough:

SO2 gas is generated by the chemical reaction between Na2S2O5 (SMB) to the HCl in the solution.

In turn SO2 gas dissolves by the free H2O to form Sulfurous acid (H2SO3).

Both free SO2 and H2SO3 react with 2HAuCl4 (chloroauric acid), thus reducing it to gold metal.

SO2 + H2SO4 are oxidized to H2SO4 (sulfiric acid)

[indeedItdoes]

@VexingRandomness

* Fix

SO2 + H2SO3 are oxidized to H2SO4 (sulfiric acid)

[dwoodruff83]

@VexingRandomness Ever had a soda?

[jokerwhysoseriou1000]

once you have the gold removed how do you make it solid again?

[indeedItdoes]

@jokerwhysoseriou1000

You can see the process in my other videos.

[molceonly]

i had gold with cyclohexanol solution, can't wait to do the chemical thing, i burn out the solution to get the gold, now my gold dust color not so nice, it's get like greenish pale brownish yellow. can i purify them if i use aqua regia method? thanks

[indeedItdoes]

@molceonly

At what state the gold is? metallic powder or some sort of compound?

what do you mean by "burn out the solution"? did you evaporate it?

If your gold is in elemental state than, yes you can use AR to purify your gold. but you most incinerate it before dissolving.

[molceonly]

@indeedItdoes before it was liquid gold for ceramic decorative paste, now it's in powder form now. the solution can't be evaporate it will turn to jello. 

[indeedItdoes]

@molceonly

Oh... OK, so in essence you incinerated the gold, that good.

try a small test sample first, but basically AR should work for you... good luck

[molceonly]

@indeedItdoes well, lets hope the best AR will do the trick, or i will be miserably tortured my soul... hiks... i'm hoping the best for my 40gr gold and 12gr Platinum.. wish me luck okay?

[indeedItdoes]

@molceonly

I really do wish you luck and thanks for sharing with us.

don't forget to update us when you are all done.

[205krs]

@molceonly how do you get the gold from ceramics to powder form? I have not been able to find a good method

[molceonly]

@205krs i didn't... i have several jar of gold paste with Cyclohexanol solution as binding. i'm tried to dissolve the Cyclo with lots of water but no luch, the binding was too strong. the only way to get the metallic form is to incinerate it at certain heat. from that stage, i can manage to get the metal separate from the paste completely, however, the oxidation and incinerate process left too much carbon trace... that's what i need the AR for... to purify it...

[indeedItdoes]

@molceonly

did you had any success in your process yet?

[molceonly]

@indeedItdoes not so much success... the gold i have is not pure, it contain silver and other bright metal... i got only 10 grams out of 40 grams metal out of 800 grams solution...

it's a real ditch... i think i just got cheated... so basically the gold solution i have only contain 1% gold, not 12% as it claimed...

[indeedItdoes]

@molceonly

Did you buy it for the purpose of gold recovery?

while that situation is not that uncommon in the gold recovery market, you most be sure you tested, and extracted all of the gold. not loosing anything in the burn out maybe... in the filters...

those are stuff that i double check when the yield do not meet expectations....

[molceonly]

@indeedItdoes yeah, i have second thoughts about it too... i separated several beaker to make sure i don't throw away anything... so last thing i know, just got 10 grams....

nope, i used to make my own gold lining cup and ceramic deco... the gold paste is what left over from previous business.... i though i could get the gold out and make a money from it... ceramic deco doesn't make so much money now....

[indeedItdoes]

@molceonly

well... hopefully you'll have better luck next time.

Sam 

[molceonly]

@indeedItdoes well, thanks dude... advises will help alot next time too.... hahahaha

[molceonly]

@indeedItdoes well, thanks dude... advises will help alot next time too.... hahahaha

[molceonly]

@indeedItdoes i'm working with a new batch of mobile phone scrap and processor pins, i've manage to extract the gold plating off and make AR, one thing to ask... is it common happen AR is dark green?

1st, i dissolve copper and other metal with nitric, what leave of it was pure gold plating scrap.

2nd, i took the gold out for AR in new beaker... after AR, i put in SMB but nothing happen, no gold dust nothing come out of it.... it's been couple days out...

please advise...

[indeedItdoes]

@molceonly

Green AR = copper in solution, meaning you didn't eliminated all base metals with nitric.

It's very easy to miss traces of base metals with improper base metals leach, e.g. not leaving it enough time to react, not using enough acid or heat... You will need to consider these factors.

When you made your AR to dissolve :

how much nitric acid did you use? excess nitric acid will prevent dropping.

how much gold do you estimate you have dissolved?

[molceonly]

@indeedItdoes AR exact amount of nitric 1 part HCL 3 part. if nitric excess too much, how to reduce and gain dropping?

[indeedItdoes]

@molceonly

You will need to evaporate slowly the solution down to a syrup like consistency (or crystallization), add a little hydrochloric acid slowly to dilute.

Repeat the two more times.

In advance, try and use as little nitric as possible, add it with small incriminates instead of a bulk as per whatever recipe you have read...

[molceonly]

@indeedItdoes thanks man.... i will try that out and post you the result....

[indeedItdoes]

@molceonly

Anyway, even a contaminated AR, assuming it is neutralized will drop the gold after few days to leave a thin layer on the bottom of the flask.

One thing that is common to most newbies (no offense) i have encountered is: they simply have too little gold dissolved to actually notice it in later steps, for example, for fiber CPU's, you are looking at 0.5-0.7 grams per 100 pieces. you should always keep that in mind.

[molceonly]

@indeedItdoes None taken dude.... thanks dude... i have learned from your website before doing any stupid thing against my gold. i also put back the previous batch result, so i actually expect not thin layer.

but this time AR result is totally different from first batch... first batch was pure dark orange.... this 2nd batch simply emerald green... so i assume my 1st batch gold fail to come back... and no, i'm not throwing anything...

have any idea about it?

[molceonly]

@205krs if you like to get the gold out from ceramic, try reversal electrolisys or simply dip the ceramic inside AR. it should leave the ceramic intact and the gold out of it.... that should work i think... but you need lots of ceramic plate to get a gram gold.

[texasukperth]

@molceonly so you burn it out to get the gold just want to know does it work

[molceonly]

@texasukperth well, cyclo flashed at 67 centigrade, but the gold can only melt above 1250' so i manage to flash it using my micro jet burner and get it bind together as gold sand at 1200' ... at that range the cyclo all gone...

[texasukperth]

what is AR can anyone please help me thank you very much

[molceonly]

@texasukperth AR is aqua regia, mixture of Hydrogen Chloride (HCL) and Nitric Acid (HNO3)... AR usually use for "dismantling" metallic property out of precious metal.

try google it my friend, lots of people had better and sufficient knowledge of this thing than i am....

[eggseder]

Previously UREA? or only metabisulfite

[indeedItdoes]

@eggseder

no.

no urea or boil down, just used enough nitric to only dissolve the gold without excess.

[thaibu]

If you have dissolved copper (blue/green) then there is a differ method using NO2 to drop the gold thus no need for stinky sulfur compounds.

[indeedItdoes]

i don't know this method.

but my solution was only gold.

though i would take SO2 any day rather then use that amounts of NO2.

how selective is it for gold?