Help
Join now
Sign in
I was looking into gold refining and came across a lot of information on Aqua Regina. While I found quite a feww step-by-step articles, I have yet to find anything that explaines exactly why mixing these acids can dissove gold.
Anyone care to lent this old phogy some help in the matter? (pardon the pun)
Welcome! You are currently viewing the Hypography Science Forum as a guest. In order to participate in our science discussions, you should register now! Registration is free and you can use your Facebook login if you like.
Gold Refining
Rate Topic:
Promote to Article
#2
gpdone 
- Thinking
-
- Group: Members
- Posts: 36
- Joined: 03-November 04
Posted 06 December 2004 - 04:45 PM
It's been awhile but this may serve as a starting point;
Fisrt of all I've never heard of Aqua Regina out side of classical Lit. It sounds like a brand name for something. If it is uric acid in solution that would make sense heap leaching gold wise as uric acid acts to corrode (oxidise) iron in which much native lode gold is found in association. In addition uric acid or urea the chrystal when heated during electrolysis produces cyanide (the primary agent for leaching processes for precious metals)which further creates micron gold for deposition on the plates. This is from years ago research into mining methods and hopfully will be clarified or corrected by a for real Chemist!
Good luck,
Lee
PS DONT try this at home. Cyanide is DEADLY even in small amounts so no heating you urin on the stove just to see what happens!;-)
Fisrt of all I've never heard of Aqua Regina out side of classical Lit. It sounds like a brand name for something. If it is uric acid in solution that would make sense heap leaching gold wise as uric acid acts to corrode (oxidise) iron in which much native lode gold is found in association. In addition uric acid or urea the chrystal when heated during electrolysis produces cyanide (the primary agent for leaching processes for precious metals)which further creates micron gold for deposition on the plates. This is from years ago research into mining methods and hopfully will be clarified or corrected by a for real Chemist!
Good luck,
Lee
PS DONT try this at home. Cyanide is DEADLY even in small amounts so no heating you urin on the stove just to see what happens!;-)
'There is only one kind of stuff.'
#3
Tim_Lou
- Explaining
- Group: Members
- Posts: 919
- Joined: 23-December 03
Posted 07 December 2004 - 04:33 PM
yeah, cyanide performs a complexation reaction with gold.
well, i dont know much, here is some info found on the internet:
http://doccopper.tri...d/AltLixiv.html
"Au + 2CN - = Au(CN)2 - + e -"
the gist of the whole article. : )
*notice Au(CN)2- is (CN)2, not 2- charged.
well, i dont know much, here is some info found on the internet:
http://doccopper.tri...d/AltLixiv.html
"Au + 2CN - = Au(CN)2 - + e -"
the gist of the whole article. : )
*notice Au(CN)2- is (CN)2, not 2- charged.
I have mistaken, apologized, and taken the consequences. My only regret, was for how I was bothered by the unchangable.
#4
Tim_Lou
- Explaining
- Group: Members
- Posts: 919
- Joined: 23-December 03
Posted 07 December 2004 - 04:37 PM
btw, cyanide is really poisonous, pure hydrocyanic acid (HCN, a gas actually) can kill a person in minutes.
"Cyanide gas is highly flammable and reacts violently in some situations (e.g., a largeamount of cyanide gas mixed with air may suddenly explode). There is an extremelyhigh risk of explosion if cyanides are exposed to heat or flames. Most of the safetyprocedures are aimed at preventing the substance from entering the human body andavoiding situations where cyanide solids or liquids might react to produce the highlypoisonous and flammable cyanide gas."
all credit from:
http://www.safetylin...azshazd0005.pdf
"Cyanide gas is highly flammable and reacts violently in some situations (e.g., a largeamount of cyanide gas mixed with air may suddenly explode). There is an extremelyhigh risk of explosion if cyanides are exposed to heat or flames. Most of the safetyprocedures are aimed at preventing the substance from entering the human body andavoiding situations where cyanide solids or liquids might react to produce the highlypoisonous and flammable cyanide gas."
all credit from:
http://www.safetylin...azshazd0005.pdf
I have mistaken, apologized, and taken the consequences. My only regret, was for how I was bothered by the unchangable.
#5
GAHD
- Creating
-
- Group: Administrators
- Posts: 2,167
- Joined: 04-December 03
- Locationwinterpeg, manitoba
Posted 07 December 2004 - 04:46 PM
My bad, Aqua Regia (Royal Water), not Aqua Regina.
From what I've gathered it's made with 1 part nitric acid to every 4 parts muriatic acid.
Gold will not dissolve in either of these acids alone but will dissolve when they are mixed into Aqua Regia.
Aqua Regia is also used for etching of other metals, but is relatively useless for dissolving Silver.
From what I've gathered it's made with 1 part nitric acid to every 4 parts muriatic acid.
Gold will not dissolve in either of these acids alone but will dissolve when they are mixed into Aqua Regia.
Aqua Regia is also used for etching of other metals, but is relatively useless for dissolving Silver.
Sometimes a Hypography Forum Administrator
"With a big enough engine, even a brick will fly." -Law of Aerospace
"With a big enough engine, even a brick will fly." -Law of Aerospace
#7
UncleAl
- Creating
- Group: Members
- Posts: 1,208
- Joined: 23-September 02
Posted 20 May 2005 - 05:52 AM
Aqua regia "royal water" is 3:1 HCl/HNO3 vol/vol that after mixing rapidly evolves nitrosyl chloride, (NOCl) and chlorine. Nasty and hazardous.
Dissolution of gold requires oxidation and complexation. Brine and air or hydrogen peroxide will do it (tetrachloroaurate(III) as end product), so will cyanide and air (tetracyanoaurate(III)). Aqua regia is a buzz saw for metallic gold, giving tetrachloroaurate(III) as end product. Metallic gold is typically recovered by oxalate reduction. Platinum is unaffected.
Presence of ammonia during gold recovery will lead to "explosive gold" with roughly the sensitivty and power of lead azide.
Dissolution of gold requires oxidation and complexation. Brine and air or hydrogen peroxide will do it (tetrachloroaurate(III) as end product), so will cyanide and air (tetracyanoaurate(III)). Aqua regia is a buzz saw for metallic gold, giving tetrachloroaurate(III) as end product. Metallic gold is typically recovered by oxalate reduction. Platinum is unaffected.
Presence of ammonia during gold recovery will lead to "explosive gold" with roughly the sensitivty and power of lead azide.
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath....uncleal/qz4.htm
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath....uncleal/qz4.htm
#8
GAHD
- Creating
-
- Group: Administrators
- Posts: 2,167
- Joined: 04-December 03
- Locationwinterpeg, manitoba
Posted 21 May 2005 - 02:18 AM
'Buzz saw"? You mean just that it reacts quickly?
also,do you think I could recover pure gold from the end product with electrolysis?
also,do you think I could recover pure gold from the end product with electrolysis?
Sometimes a Hypography Forum Administrator
"With a big enough engine, even a brick will fly." -Law of Aerospace
"With a big enough engine, even a brick will fly." -Law of Aerospace
#10
thaupt
- Curious
- Group: Members
- Posts: 3
- Joined: 05-August 06
Posted 05 August 2006 - 08:59 AM
I have been thinking of refining my own platinum and gold... I have found an interesting and not to expensive "Home refining" kit. The link is... well i was going to post a link... but the system will not let me. What I did was a google search for...
home gold refining
and found this.
shorinternational dot com slash RefineStart dot htm
It seems simple enough and no harsh chemicals always a plus.
home gold refining
and found this.
shorinternational dot com slash RefineStart dot htm
It seems simple enough and no harsh chemicals always a plus.
#11
Mercedes Benzene
- Student
-
- Group: Moderators
- Posts: 2,826
- Joined: 11-May 06
Posted 05 August 2006 - 09:09 AM
Here's an interesting bit about aqua regia (one of my favorite chemical solutions!).
"It has been said that James Franck, the Nobel Prizewinner, dissolved his gold metal in aqua regia in 1943 to prevent it falling into the hands of the Nazis when he fled Denmark, and left it unobtrusively in his laboratory. When he returned in 1945 the bottle of acid was still there, so he reclaimed the gold and a new medal was struck."
"It has been said that James Franck, the Nobel Prizewinner, dissolved his gold metal in aqua regia in 1943 to prevent it falling into the hands of the Nazis when he fled Denmark, and left it unobtrusively in his laboratory. When he returned in 1945 the bottle of acid was still there, so he reclaimed the gold and a new medal was struck."
"No power in the 'verse can stop me."
Moderator -- Chemistry, Biology, Watercooler, Competitions, Architecture.
Join our Facebook group
Moderator -- Chemistry, Biology, Watercooler, Competitions, Architecture.
Join our Facebook group
#12
Scrib
- Curious
- Group: Members
- Posts: 2
- Joined: 27-September 07
Posted 27 September 2007 - 02:59 PM
In regards to the post about Shor products. The chemicals they sell can be had for pennies on the dollar from ebay, hardware stores and home brew stores. The information they provide sounds really good when your in the gold fever phase but be careful, they are selling a myth. I know this from experience.
As far as Aqua Regia (AR) goes. I've dabbled with it with limited results. It's not for the faint of heart. The chemicals and fumes are VERY DANGEROUS. For the hobbyist, like myself, I recommend using acid-peroxide. It's safer, in comparison, to AR and much easier if your working with limited equipment and access to materials. Good luck!
As far as Aqua Regia (AR) goes. I've dabbled with it with limited results. It's not for the faint of heart. The chemicals and fumes are VERY DANGEROUS. For the hobbyist, like myself, I recommend using acid-peroxide. It's safer, in comparison, to AR and much easier if your working with limited equipment and access to materials. Good luck!
#13
aogneun
- Curious
- Group: Members
- Posts: 2
- Joined: 16-May 08
Posted 16 May 2008 - 08:07 AM
Hi,
Aqua Regia, a combination of nitric acid and hydrocloric acid, mixes quitly.either acid may be poured into the other.It's a very aggressive liquid. As soon as mixed, the aqua regia start to form and slowly emits chlorine gas for a day or two. Aqua Regia containers must NOT be closed. Thje chlorine pressure in a closed container can produce enough pressure to break the bottle. It should be stored in a suitable fume hood.
The dissolution of metals by aqua regia produces an oxide of nitrogen that is a colorless gas. However, as soon as this oxide of nitrogen reaches air, it combines with oxygen of the air and forms a reddish brown fume. This is choking , coorosive and toxic gas.
Gold can be refined in a number of ways. There are special rteasons for use these different methods. Some proccesses are very very old. a few where devised in the late 1800's. Some methods are fairly new but these tend te be applies to specialized needs.
The disadvabtage of Aqua Regia method is that it requires strong acids, produces rather vile fumles and the leftovers barren solution is a pollution problem.
Gold chloride is formed when aqua regia digezst gold scrap.
The reaction of the aqua regia with the metals in the scrap produces nitrogen oxides. When the alloy contains about 8 to 10% of silver an adherent layer of silver chloride forms and "protects" the metal from dissolution. Melting and dilution with copper is the only reasonable way of dissolving high silver material.
When the gold content of the scrap is below 30% any copper and silver present can be dissolved with nitric acid.
FILTERING:
The aqua regia now contains various metal chlorides in solution and insoluble silver chloride as well as a lot of unwanted material in the sludge, and the mixture muqt be cooled and filtered; reason for cooling is that the silver chloride; quite insoluble in water, is slightly soluble in stron,g acids and this solubility is lower in cold acids.
It is gopod practice to add a little sulfuric acid to the dissolution vessel before filtering. When there is lead in the scrap it forms a very hard to filter gelatinous material ( also true for tin). The the aqua regia solution has to be filtered with a bucher filtering funnel. After filtering the filter paper contains the unwanted material (also silver chloride). The filtered liquid is usually a rather handsome clear green color, due to nickel and copper. If only gold chloride were present, it would be yellowish.
The excess aqua regia that was added to insure complete solution of the gold is still in the solution at this stage and must be eliminated at this stage to allow the gold to be precipitated.
The classic procedure for nitric acid elimination is repeated boiling to near dryness with trhe addition of hydrochloric acid with some sulfuric acid near the end. There are a number of other chemical methods to eliminate the nitric acid... see use of Urea (carbamide)...
PRECIPITATING THE GOLD:
The classic method of reducing gold chloride in solution to solid gold is to add "copperas" to the solution. (=ferrous sulphate)also can use hydroquinone (experimantal use). Also other procedures excists. Copperas is prefered also because it leaves platinum in a chemical state easily changed to an insoluble condition. Also other procedures excist with for example sodium bisulfite, sodium sulfite, sulfur dioxide gas can be used as reducers.
Thge end point is easily determined by a test for the presence of dissolved gold (stannous chloride test) ... i can tell you receipt if needed.
Filtration:
When the solution has been cleared of gold it should be allowed to stand preferably overnight. Althought gold is heavy and most of it settles quicly, some particles are very small and require time to go to the bottom.
Before doing any filtering the solution is tested with the stannous chloride test)
Washing The gold and Melting the gold.... etc....
GOLD CHEMISTRY:
Aqua regia is a mixture of hydrochloride and nitric acids.
Au + HNO³ + 4HC1 = H²O + NO + HAuC1(4) as for all chemical formulas i will have to send them by mail .. if your interested you mail me at frederic_carpentier@hotmail.com. i will send you a copy of some pages in proffessional literature about gold refining.
Hope i helped a bit in your search..
all the best...
Frederic Carpentier Buddy's Gold Belgium Brugge.
Specialized in Antique jewellry , watches , precious gemstones, etc...
You always welcome with any questions regarding jewelry. Actually refining is not my speciality. I'm more into antique jewelry and watches.
next year our website will be online CRE Loaded 6 - AllTimesjewels online store
Aqua Regia, a combination of nitric acid and hydrocloric acid, mixes quitly.either acid may be poured into the other.It's a very aggressive liquid. As soon as mixed, the aqua regia start to form and slowly emits chlorine gas for a day or two. Aqua Regia containers must NOT be closed. Thje chlorine pressure in a closed container can produce enough pressure to break the bottle. It should be stored in a suitable fume hood.
The dissolution of metals by aqua regia produces an oxide of nitrogen that is a colorless gas. However, as soon as this oxide of nitrogen reaches air, it combines with oxygen of the air and forms a reddish brown fume. This is choking , coorosive and toxic gas.
Gold can be refined in a number of ways. There are special rteasons for use these different methods. Some proccesses are very very old. a few where devised in the late 1800's. Some methods are fairly new but these tend te be applies to specialized needs.
The disadvabtage of Aqua Regia method is that it requires strong acids, produces rather vile fumles and the leftovers barren solution is a pollution problem.
Gold chloride is formed when aqua regia digezst gold scrap.
The reaction of the aqua regia with the metals in the scrap produces nitrogen oxides. When the alloy contains about 8 to 10% of silver an adherent layer of silver chloride forms and "protects" the metal from dissolution. Melting and dilution with copper is the only reasonable way of dissolving high silver material.
When the gold content of the scrap is below 30% any copper and silver present can be dissolved with nitric acid.
FILTERING:
The aqua regia now contains various metal chlorides in solution and insoluble silver chloride as well as a lot of unwanted material in the sludge, and the mixture muqt be cooled and filtered; reason for cooling is that the silver chloride; quite insoluble in water, is slightly soluble in stron,g acids and this solubility is lower in cold acids.
It is gopod practice to add a little sulfuric acid to the dissolution vessel before filtering. When there is lead in the scrap it forms a very hard to filter gelatinous material ( also true for tin). The the aqua regia solution has to be filtered with a bucher filtering funnel. After filtering the filter paper contains the unwanted material (also silver chloride). The filtered liquid is usually a rather handsome clear green color, due to nickel and copper. If only gold chloride were present, it would be yellowish.
The excess aqua regia that was added to insure complete solution of the gold is still in the solution at this stage and must be eliminated at this stage to allow the gold to be precipitated.
The classic procedure for nitric acid elimination is repeated boiling to near dryness with trhe addition of hydrochloric acid with some sulfuric acid near the end. There are a number of other chemical methods to eliminate the nitric acid... see use of Urea (carbamide)...
PRECIPITATING THE GOLD:
The classic method of reducing gold chloride in solution to solid gold is to add "copperas" to the solution. (=ferrous sulphate)also can use hydroquinone (experimantal use). Also other procedures excists. Copperas is prefered also because it leaves platinum in a chemical state easily changed to an insoluble condition. Also other procedures excist with for example sodium bisulfite, sodium sulfite, sulfur dioxide gas can be used as reducers.
Thge end point is easily determined by a test for the presence of dissolved gold (stannous chloride test) ... i can tell you receipt if needed.
Filtration:
When the solution has been cleared of gold it should be allowed to stand preferably overnight. Althought gold is heavy and most of it settles quicly, some particles are very small and require time to go to the bottom.
Before doing any filtering the solution is tested with the stannous chloride test)
Washing The gold and Melting the gold.... etc....
GOLD CHEMISTRY:
Aqua regia is a mixture of hydrochloride and nitric acids.
Au + HNO³ + 4HC1 = H²O + NO + HAuC1(4) as for all chemical formulas i will have to send them by mail .. if your interested you mail me at frederic_carpentier@hotmail.com. i will send you a copy of some pages in proffessional literature about gold refining.
Hope i helped a bit in your search..
all the best...
Frederic Carpentier Buddy's Gold Belgium Brugge.
Specialized in Antique jewellry , watches , precious gemstones, etc...
You always welcome with any questions regarding jewelry. Actually refining is not my speciality. I'm more into antique jewelry and watches.
next year our website will be online CRE Loaded 6 - AllTimesjewels online store
#14
aogneun
- Curious
- Group: Members
- Posts: 2
- Joined: 16-May 08
Posted 16 May 2008 - 08:07 AM
Hi,
Aqua Regia, a combination of nitric acid and hydrocloric acid, mixes quitly.either acid may be poured into the other.It's a very aggressive liquid. As soon as mixed, the aqua regia start to form and slowly emits chlorine gas for a day or two. Aqua Regia containers must NOT be closed. Thje chlorine pressure in a closed container can produce enough pressure to break the bottle. It should be stored in a suitable fume hood.
The dissolution of metals by aqua regia produces an oxide of nitrogen that is a colorless gas. However, as soon as this oxide of nitrogen reaches air, it combines with oxygen of the air and forms a reddish brown fume. This is choking , coorosive and toxic gas.
Gold can be refined in a number of ways. There are special rteasons for use these different methods. Some proccesses are very very old. a few where devised in the late 1800's. Some methods are fairly new but these tend te be applies to specialized needs.
The disadvabtage of Aqua Regia method is that it requires strong acids, produces rather vile fumles and the leftovers barren solution is a pollution problem.
Gold chloride is formed when aqua regia digezst gold scrap.
The reaction of the aqua regia with the metals in the scrap produces nitrogen oxides. When the alloy contains about 8 to 10% of silver an adherent layer of silver chloride forms and "protects" the metal from dissolution. Melting and dilution with copper is the only reasonable way of dissolving high silver material.
When the gold content of the scrap is below 30% any copper and silver present can be dissolved with nitric acid.
FILTERING:
The aqua regia now contains various metal chlorides in solution and insoluble silver chloride as well as a lot of unwanted material in the sludge, and the mixture muqt be cooled and filtered; reason for cooling is that the silver chloride; quite insoluble in water, is slightly soluble in stron,g acids and this solubility is lower in cold acids.
It is gopod practice to add a little sulfuric acid to the dissolution vessel before filtering. When there is lead in the scrap it forms a very hard to filter gelatinous material ( also true for tin). The the aqua regia solution has to be filtered with a bucher filtering funnel. After filtering the filter paper contains the unwanted material (also silver chloride). The filtered liquid is usually a rather handsome clear green color, due to nickel and copper. If only gold chloride were present, it would be yellowish.
The excess aqua regia that was added to insure complete solution of the gold is still in the solution at this stage and must be eliminated at this stage to allow the gold to be precipitated.
The classic procedure for nitric acid elimination is repeated boiling to near dryness with trhe addition of hydrochloric acid with some sulfuric acid near the end. There are a number of other chemical methods to eliminate the nitric acid... see use of Urea (carbamide)...
PRECIPITATING THE GOLD:
The classic method of reducing gold chloride in solution to solid gold is to add "copperas" to the solution. (=ferrous sulphate)also can use hydroquinone (experimantal use). Also other procedures excists. Copperas is prefered also because it leaves platinum in a chemical state easily changed to an insoluble condition. Also other procedures excist with for example sodium bisulfite, sodium sulfite, sulfur dioxide gas can be used as reducers.
Thge end point is easily determined by a test for the presence of dissolved gold (stannous chloride test) ... i can tell you receipt if needed.
Filtration:
When the solution has been cleared of gold it should be allowed to stand preferably overnight. Althought gold is heavy and most of it settles quicly, some particles are very small and require time to go to the bottom.
Before doing any filtering the solution is tested with the stannous chloride test)
Washing The gold and Melting the gold.... etc....
GOLD CHEMISTRY:
Aqua regia is a mixture of hydrochloride and nitric acids.
Au + HNO³ + 4HC1 = H²O + NO + HAuC1(4) as for all chemical formulas i will have to send them by mail .. if your interested you mail me at frederic_carpentier@hotmail.com. i will send you a copy of some pages in proffessional literature about gold refining.
Hope i helped a bit in your search..
all the best...
Frederic Carpentier Buddy's Gold Belgium Brugge.
Specialized in Antique jewellry , watches , precious gemstones, etc...
You always welcome with any questions regarding jewelry. Actually refining is not my speciality. I'm more into antique jewelry and watches.
next year our website will be online CRE Loaded 6 - AllTimesjewels online store
Aqua Regia, a combination of nitric acid and hydrocloric acid, mixes quitly.either acid may be poured into the other.It's a very aggressive liquid. As soon as mixed, the aqua regia start to form and slowly emits chlorine gas for a day or two. Aqua Regia containers must NOT be closed. Thje chlorine pressure in a closed container can produce enough pressure to break the bottle. It should be stored in a suitable fume hood.
The dissolution of metals by aqua regia produces an oxide of nitrogen that is a colorless gas. However, as soon as this oxide of nitrogen reaches air, it combines with oxygen of the air and forms a reddish brown fume. This is choking , coorosive and toxic gas.
Gold can be refined in a number of ways. There are special rteasons for use these different methods. Some proccesses are very very old. a few where devised in the late 1800's. Some methods are fairly new but these tend te be applies to specialized needs.
The disadvabtage of Aqua Regia method is that it requires strong acids, produces rather vile fumles and the leftovers barren solution is a pollution problem.
Gold chloride is formed when aqua regia digezst gold scrap.
The reaction of the aqua regia with the metals in the scrap produces nitrogen oxides. When the alloy contains about 8 to 10% of silver an adherent layer of silver chloride forms and "protects" the metal from dissolution. Melting and dilution with copper is the only reasonable way of dissolving high silver material.
When the gold content of the scrap is below 30% any copper and silver present can be dissolved with nitric acid.
FILTERING:
The aqua regia now contains various metal chlorides in solution and insoluble silver chloride as well as a lot of unwanted material in the sludge, and the mixture muqt be cooled and filtered; reason for cooling is that the silver chloride; quite insoluble in water, is slightly soluble in stron,g acids and this solubility is lower in cold acids.
It is gopod practice to add a little sulfuric acid to the dissolution vessel before filtering. When there is lead in the scrap it forms a very hard to filter gelatinous material ( also true for tin). The the aqua regia solution has to be filtered with a bucher filtering funnel. After filtering the filter paper contains the unwanted material (also silver chloride). The filtered liquid is usually a rather handsome clear green color, due to nickel and copper. If only gold chloride were present, it would be yellowish.
The excess aqua regia that was added to insure complete solution of the gold is still in the solution at this stage and must be eliminated at this stage to allow the gold to be precipitated.
The classic procedure for nitric acid elimination is repeated boiling to near dryness with trhe addition of hydrochloric acid with some sulfuric acid near the end. There are a number of other chemical methods to eliminate the nitric acid... see use of Urea (carbamide)...
PRECIPITATING THE GOLD:
The classic method of reducing gold chloride in solution to solid gold is to add "copperas" to the solution. (=ferrous sulphate)also can use hydroquinone (experimantal use). Also other procedures excists. Copperas is prefered also because it leaves platinum in a chemical state easily changed to an insoluble condition. Also other procedures excist with for example sodium bisulfite, sodium sulfite, sulfur dioxide gas can be used as reducers.
Thge end point is easily determined by a test for the presence of dissolved gold (stannous chloride test) ... i can tell you receipt if needed.
Filtration:
When the solution has been cleared of gold it should be allowed to stand preferably overnight. Althought gold is heavy and most of it settles quicly, some particles are very small and require time to go to the bottom.
Before doing any filtering the solution is tested with the stannous chloride test)
Washing The gold and Melting the gold.... etc....
GOLD CHEMISTRY:
Aqua regia is a mixture of hydrochloride and nitric acids.
Au + HNO³ + 4HC1 = H²O + NO + HAuC1(4) as for all chemical formulas i will have to send them by mail .. if your interested you mail me at frederic_carpentier@hotmail.com. i will send you a copy of some pages in proffessional literature about gold refining.
Hope i helped a bit in your search..
all the best...
Frederic Carpentier Buddy's Gold Belgium Brugge.
Specialized in Antique jewellry , watches , precious gemstones, etc...
You always welcome with any questions regarding jewelry. Actually refining is not my speciality. I'm more into antique jewelry and watches.
next year our website will be online CRE Loaded 6 - AllTimesjewels online store
#15
Kayra
- Explaining
- Group: Members
- Posts: 524
- Joined: 05-January 06
Posted 20 May 2008 - 06:26 AM
A friend of mine once claimed he bought scrap supercomputers (back when they were mostly hand made), disassembled them, and left parts in a bath of mercury.
Afterward he would take the gold dissolved in the mercury and filter it through a true leather shammy to recover the gold.
In the end, he said he would take 20-40 used shammies and smelt them.
He also mentioned that at some point the mercury solidified. I did not know it could do that.
While sometimes prone to stories of the tall sort, this gentleman was also an knowledgeable, accomplished, and meticulous inventor, so I am left with not knowing how valid his method was.
Afterward he would take the gold dissolved in the mercury and filter it through a true leather shammy to recover the gold.
In the end, he said he would take 20-40 used shammies and smelt them.
He also mentioned that at some point the mercury solidified. I did not know it could do that.
While sometimes prone to stories of the tall sort, this gentleman was also an knowledgeable, accomplished, and meticulous inventor, so I am left with not knowing how valid his method was.
Thank goodness science is based on "survival of the fittest" rather than being a Democracy!
Buffy
Evolution is a hoot if you are one of the survivors.
UncleAl
Buffy
Evolution is a hoot if you are one of the survivors.
UncleAl
