What Chemical Can I Use to Precipitate the Gold Out of Gold Chloride
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"Solution for precipitating gilt from HAuCl4 solution"
An ongoing word first back in 2005 ...
2005
Q. Respected Sir,
My technical trouble is how to precipitate gold from HAuCl4 solution. We recover gold from Filings, Setting, Waste h2o, Consumables used in production, Emery papers, and sweeps from the product floors.
We dissolve the above mention media into aqua Regia solution & on filtration precipitate it with a solution which is called every bit AURO8032, locally bachelor, which has a pH Factor of 8-nine, & gives out white fumes when the can is opened. The solution also smells strongly of ammonia.
When we pour the precipitate in the HAuCl4 solution,the solution becomes black giving out yellow fizz in the solution. After few seconds you tin practically see big brown spongy ball like gold getting precipitated & in one case all the gold in the solution has precipitated the solution at the peak has lot of white foam, which indicates the end of precipitation.
Nosotros permit the solution stand up overnight to settle downwards & recover gold from it by washing information technology with water.
Though I know Sodium Metabisulfite, Ferrous Sulphate, S02,Copper, can precipitate gilt. But with these above chemicals it takes whole day & with AURO 8032 its takes simply few minutes & the atmospheric precipitation is over. What could exist this solution? its extremely constructive & has no golden residues left in the solution. The left over solution becomes Dark bluish & Dark-green in colour & I am always getting 999.99 purity gilded with this solution on precipitation.
I would likewise capeesh if you give me guide lines & Step By Step instructions on how to refine Platinum.
I am also on the lookout for books by C M Hoke & other good authors. I would like to buy these books if they are available in the marketplace.
Awaiting an early response from yous;
Best regards,
Prakash V Pai
Jobshop Employee cum Hobbyist - Maharashtra, INDIA
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Ed. note: I source of the Hoke book is Amazon.
2005
A. You utilise hydrazine hydrate for golden precipitation. Don't add urea in aureate chloride solution.
Bhupesh Mulik
jewellery - India
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2005
A. Dear Sir: Your production most likely contains hydrazine hydrate 64 or 85% (liquid) or hydrazine 2HCl (solid). It works well with acrid gold plating baths, but does not piece of work well with alkaline CN based baths. Please be careful: despite smelling like ammonia, information technology is carcinogenic and toxic to fish and people. It volition also reduce platinum salts to Pt metal in highly element of group i media (pH>10).
Richard Michael Grazul
- Juiz de Fora, MG Brazil
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2006
Kind attn: Richard Michael Grazul & Bhupesh Mulik,
Thanks a ton. It was great to get a reply from you. I will try the mentioned solution for atmospheric precipitation this week.
Q. I would further like to know how to precipitate Platinum From the Aqua regia solution!.
Secondly why should I not add urea to the solution equally this helps remove the Nitric Fumes from the solution to Neutralize before Precipitation with the help of Hydrazine hydrate? (64% or 85%?)
Can we mix HCl & Hydrazine Hydrate directly?
Or is there a procedure for the same?
Thanking you one time once again for your kind gesture.....
PRAKASH 5 PAI [returning]
- Maharashtra, India
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"Refining Precious Metal Wastes"
by C. G. Hoke
from Abe Books
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May 22, 2010
A. Hi I'yard bhupesh mulik
I dilute hydrazine hydrate with 5 parts of water, that is 1:five. And then you add it in your gold chloride solution. You can become exact value by checking your pH level of gold chloride.
bhupesh mulik
jewellery - mumbai
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2006
Q. Precipitate gilt from aqua regia. I'1000 investing about gilt precipitating from aqua regia. I know sodium metabisulfite, ferrous sulfate. But I desire to learn more about hydrazine hydrate, SO2, formaldehyde, hydroquinone and Oxalic Acid [affil. link to info/product at Rockler]. My company will begin to apply aqua regia procedure for refining gold; can you give me an respond about when I must use which precipitant for the best purifying?
Catalyst for gold analysis? A few days agone, I began to use ICP-MS for golden assay. I desire to learn if some interference the gold and bear on my result. If I must utilise a catalyst for analysis. I use aqua-regia solution for analysis.
þenay þen
chemic engineer - Istanbul, TURKEY
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2007
Q. I AM A NEW Aureate PROSPECTOR, I WOULD LIKE TO Exist Brash ON SOME OF MY CONCENTRATE THAT I Have PROCESSED USING MY MICROWAVE TABLE. FIRSTLY, WOULD VERY MUCH APPRECIATE IF You lot WOULD BE ABLE TO TELL the ACTUAL Color OF CONCENTRATE; I HAVE BEEN TABLING ORE FROM Various VEINS AND WOULD VERY MUCH NEED SOME ASSISTANCE ON AQUA REGIA LEACHING METHOD. VERY MUCH Give thanks IF You lot ARE ABLE TO ADVISE OR EDUCATE ME IN THIS MATTER
JIMI
Jimi Lim
- Singapore
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February 12, 2008
Q. Dear sir, I want to know the process of refining of gold from aqua regia by footstep past footstep.
Mohammad Shakir
jeweler - Saharanpur U.P. India
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 | "Recovery And Refining Of Precious Metals" A. How-do-you-do, cousin Mohammad. Prakash named a skillful volume, "Refining Precious Metal Wastes: Gold, silverish, platinum metals" past C. M. Hoke, if you lot wish to know the whole of this broad subject. Another good one is "Recovery and Refining of Precious Metallic" by C. W. Ammen.. After getting your hands on such a book, if you tin can please come dorsum with specific questions that can be answered in a few paragraphs, readers of this forum may exist able to help you with it. Simply condensing a subject that fills whole shelves in libraries down to a paragraph tin can't work :-) Good luck, and Thanks!  Ted Mooney , P.Eastward. Striving to live Aloha finishing.com - Pine Beach, New Jersey ^ |
February 22, 2008
Q. I HAVE REDUCED A BRICK OF ALUMIA TO A LIQUID USING HYDROCHLORIC Acid Under Depression HEAT. THE RESULT IS HYDROGEN CHLORIDE, THE BRICK HAVING PRECIOUS Metallic, I DISTILLED THE HYDROGEN CHLORIDE INTO A GLASS CONTAINER AND At that place IS A BLACK SUBSTANCE IN THE BOTTOM OF THE CONTAINER. WOULD THIS BE PLATINUM Black OR RHODIUM Blackness? AND IF Then, HOW Do I GET It TO A Salt OR IF ITS BOTH PLATINUM AND RHODIUM, HOW DO I Separate THE Two THEN Get THEM TO A Table salt? THANK YOU DAVID
DAVID STUART
HOBBYIST - MERIDIAN, Mississippi
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March 19, 2008
Q. I have done a small research about precipitating gold out of Aqua Regia solution.
I employ iii HCL+1 Nitric Acrid to make Aqua Regia.
Let it work ane dark or just heat it up for a while to shortened the process.
Filter the solution and neutralize it with Urea or just heat information technology up until all of the nitric vaporized. Sentinel out non to lose whatsoever precious metal during the heating. Examination the pH.
Precipitate gold using sodium metabisulfite/ zinc.
You can apply above method for whatsoever kind of source which contains gold.
I need a favour well-nigh precipitating platinum out of the solution. Should I employ salmiac?
Regards,
Ivan Christianto
- Salatiga, Fundamental Coffee, Indonesia
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Ed. annotation: "Salmiac"? Sorry, that word isn't familiar. Is it perhaps the same as "sal ammoniac"?
June 27, 2008
Q. I buy scrap gold from market , comminute it and assimilate it to aqua regia digestion. The excess nitric of the gilt solution is driven with urea add-on till the point where the urea does not react whatsoever more. And then I use pure S0two to precipitate the gold. but I do not get the total recovery . I get only 75%. balance I take to get thru metabisulphite treatment. my question;
Why I am non getting the full recovery with S0two at first ?
d. bhatta
jewellery making - Calcutta, India
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July seven, 2008
A. In response to d. bhatta
To driblet a larger % you must slowly heat solution to simmering, merely below 200 °F (do non boil). Expect at least 1 hour before filtering, re-filter. Also consider your ct/in (?) compared to ct/out (24K).
If Pt is in solution you want to drop that first, aforementioned style with NH4Cl. Hope this helps.
Ii other things,
i) Na2And then4 is ameliorate for dropping the aureate (free electrons
greater reactivity)
2) Residual solution 24 hours afterward dropping final of Pt
It falls out on its own, filter and salvage up.
It will aid pay for your chems.
If you are selling your Pt bring the It with you
some buyers will try to tell you lot your Pt is ten% It
This way y'all can say this is Pt and this is It and become
full value for your Pt.
Tim Evans
ores - LaGrange Texas
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July 9, 2008
Q. Dearest Sir:
I am a hobbyist in gold refining, later using the different steps in getting the gold mud, I am left with liquid that is a brilliant bluish or sometimes a vibrant light-green. Can you tell me what these are? Are they unreclaimed silvery, platinum, palladium or rhodium?
What practice the unlike colors mean? And if so, how practice I reclaim those? Thank you
Ronda White
hobbyist - Chloride, Arizona
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July 12, 2008
A. I'll give the green bluish question a attempt.
Vivid most neon green is the norm color of a used upwardly (or near empty) solution. I test with with aqua ammonia test liquid to come across if I missed anything, only do that, to the side in a test dish. If aureate is notwithstanding present it winnings. with ammonia turning your solution blue.
Pt group metals normally but make the solution await muddy till dropped.
Everyone else accept any other ideas?
BTW Aqua Regia should exist filtered earlier adjusting the pH and just afterward.
If silver and/or a couple other nasty insoluble alloys become in the further process y'all run the risk of creating silver fulminate (bad stuff, highly unstable sim. to nitro when dry or dry heated)
2 simple filterings may save a lot of grief.
Tim Evans
- LaGrange Texas
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October 20, 2008
Q. I recently started golden recovery on a minor scale, I dissolved circuit boards in a aqua regia solution, merely now I'm lost. I would like to recover the gold in the solution merely it seems way too dangerous for an amateur similar me. And so is in that location a SAFE Easy WAY TO DO THIS or practice I need a chemistry lesson, and can I dispose of the solution safely? Any aid would be greatly appreciated.
wes covert
newby - defuniak springs, Florida
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December 5, 2008
A. Simply some quick info. I know the owner/ops actually dislike "golden recycling" :) I see their point it'south finishing, non financing.
I will say that you are using a form of Hydrazine or more likely Hydroxyl Amine- HCl. The HCl is usually neutralized with KOH or NaOH to a pH of vii. Hydrazine is rocket fuel. three factory explosions accept been attributed to information technology spontaneously. It is not a contaminant.
Hydrazine is N2H4 with a sulfate or HCl
Hydroxyl Amine - is NH2OH-HCl.
For my application there is no comparison. I have tried, every cementing and reducing agent. NH2OH wins hands down. Information technology rains sand. There is a bit of chem needed to apply it. I strip gilded based on ammonium iodine/Iodine. Don't try it unless you have a degree. screw up just a fiddling and yous made a touch sensitive explosive! I will say it strips all precious metals including rhodium. 3 minutes to strip MilSpec aureate plate. The solution is regenerated and reused with H202. 1 Gallon -(3.7 L) strips about four ounces troy vs cyanide which is 0.7 oz Troy it is done in the presence of a buffer. pH is neutral to slightly basic. Doesn't burn, isn't toxic, and does not "Crave" a fume hood.
The best office is that the set on of base metals is near none. Until using this I hated all that was nickel and copper. :)
Just call back be prophylactic,
Find the right forum to join,
and to all those of you lot get rich quick-start a lab in the garage types -got 50 beakers of witches brew and are stuck...Information technology'south not your fault. The GOOD lack of information is absurd. The showtime matter a person does is googles golden. Aqua regia comes up, they run to the lab supply and are knee deep in it.
While information technology is not your desire to provide info on the topic, I practice experience it is your responsibility to give better redirection. I have Hoke's book. and cottons, and every other one. They all read fine, if yous take done it before... The indicate is that no i is going to buy the book. They desire to apply the cyberspace. They desire to interact with others. why, what, how? Hoke is most likely expressionless and rendering him unavailable to email.
Please find a responsible refining forum to represent as a service to yourself and others.
Sad if I stepped on toes.
Don Five [last name deleted for privacy by Editor]
- Lake Geneva, Wisconsin
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Hi, Don. Yes, the chief focus of this site is metallic finishing, but we have dozens of threads about precious metallic refining, and many helpful & knowledgable responders.
We've posted many hundreds of helpful responses on this page and those other pages most refining, and we certainly appreciate yours -- only I don't understand your "not financing" complaint. Also, please don't include advertizement hominem bitching; that is unwelcome on any site.
The inquirer specifically asked where he could buy Hoke'south book, simply yous insist that "no one is going to buy the volume. They desire to use the internet", then I shouldn't take answered him :-)
People must accept books and reputable materials! Tin can you lot imagine being on the witness stand after someone was maimed or killed in an blow (been there several times), and trying to justify that y'all don't believe in books, so yous proceeded on internet forum advice from strangers who were perchance fifty-fifty posting with fictitious names?
Regards,
Ted Mooney , P.E.
Striving to live Aloha
finishing.com - Pino Beach, New Jersey
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January 29, 2009
A. Wes Covert: Since y'all are a newbie to gold refining, yous might try www.goldrefiningforum.com. Very knowledgeable. Great people and many answers. B
Ben Peters
- E. Flat Rock, North Carolina
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August six, 2009
A. A source of data for which you are looking is goldrefiningforum.com.
That site has topics about gold and other precious metals, from eScrap, ore, and former jewelry.
It had detailed information on refining, of course.
On this site, rubber is a big topic.
In that location is a lot to read on the site, and it is usually better to read and follow links there before asking questions (especially long complicated questions which would be answered if you lot just read your corresponding topics commencement). Single detail questions about annihilation which is non totally clear to you are best received, and will certainly exist answered.
I'm new to recovery and refining, and the Golden Refining Forum is the best site I've institute for learning this stuff safely. Also they are big on helping to determine which chemicals would be most economical for your item applications.
Have fun.
Eethr Don
- Oakland, California
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August xv, 2009
Howdy, Eethr. Your recommendation of goldrefiningforum.com certainly isn't a trouble; information technology was already suggested correct above your posting, besides equally many times on this site. We offer what aid we can, without claiming that our coverage of a topic is amend or non as practiced every bit another site.
Merely please endeavor to contribute at least a little technical content with your postings. Offset, links go bad, and we don't like to offer aught but the distraction & frustration of cleaved links if that happens. Second, not everyone likes every forum -- you lot can see that some people like this i and other people don't :-)
Thanks again!
Regards,
Ted Mooney , P.E.
Striving to live Aloha
finishing.com - Pine Embankment, New Bailiwick of jersey
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What is AURO 8032 Gold Precipitant?
Baronial 25, 2008
Q. Dear sir,
I am working in a branded jewellery manufacturing group. Tin can I know the supplier for AURO 8032 chemic which is used to precipitate the gold solution. Please reply to me.
KANTHANATHAN SELVAM
Plating Store Employee - Hosur,Tamil Nadu,India
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^- Pitiful, this RFQ is outdated
View Current RFQs
March 17, 2009
Q. What is the AURO 8032 solution and from where I could observe this solution? And what would be the approx. price of this solution
Anshul Mundra
- Republic of india
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^- Sorry, this RFQ is outdated
View Electric current RFQs
Apr 22, 2010
Q. Bhupesh Mulik, Many thanks for your advice regarding the apply of Hydrazine Hydrate for precipitating gold. Kindly shed more light equally to exact measurements or quantities to be used for a given gilt chloride. Whatever particular ratios? Or depending on detail reaction taking place?
Godfrey Banda
Hobbyist - Lusaka Zambia
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June 13, 2010
A. Hi godfrey, I'1000 bhupesh mulik working in jewellery company.
PtCl4+N2H4=Pt+N2+4HCl
4AuCl3+3N2H4=4Au+3N2+12HCl
4AgNO3+N2H4=4Ag+N2+4HNO3.
I promise this reaction information will solve your trouble.
bhupesh mulik
jewellery - mumbai,india
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August 12, 2010 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread
Q. I am working in Gold Refining manufacture since 1994. I have read questions and respond in your finishing.com. It is interesting. Subsequently read this, idea come up - alternate for Sodium bi-sulphate while doing Aureate Precipitation. The alternate chemical name is AURO 8032. Tin can you lot tell me the address for buying the to a higher place mentioned chemical. It volition be very useful for alternate precipitate aureate procedure. I am eagerly waiting for your reply.
Ravi Kumar
product designer - Tamilnadu, India
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October 23, 2010
A. You lot may get AURO 8032 from Aurotech bureau, JVPD MUMBAI INDIA
amit mehta
- mumbai,india
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March 20, 2009
Q. I'grand wondering as to how you can use copper as a precipitant. I've never heard of this method and wanted to know if you could elaborate on this. Currently I utilise a precipitant chosen Storm. And, whilst information technology works well, information technology's rather expensive.
Besides if anyone knows a good distributor of sodium bisulfate in the United states I would appreciate it profoundly.
William P. Momani
- Yardley, Pennsylvania
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June 11, 2012
Q. Beloved SIR,
I USE AQUA REGIA FOR Gilded REFINING. Please TELL ME THE GOOD Aureate PRECIPITATION CHEMICAL TO PRECIPITATE GOLD, AND THE MEASUREMENTS FOR Information technology.
THANKS
ASHOK VERMA
- New Delhi, India
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January fifteen, 2013
A. Dear sir, you use sodium metabisulphite for ppt of gilt. You lot tin obtain 99.99 gold reaction with smbs Na2S205. Redox value volition exist 300 mv.
Shadab [last proper name deleted for privacy by Editor]
- Gurgaon, Republic of india
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March 15, 2009
Q. Hey, love folks.
Delight, I want to ask you if can I precipitate gold from aqua regia with (atomic number 82) or not.
abdo alarbi
pocket-sized store - Tripoli, Libya
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Ed. notation: What does "(pb)" mean in this context? Lead maybe?
Apr iii, 2009
! Dearest Readers,
I take previously visited this web site which is a peachy identify to learn and give advice from others interested in gold and precious metallic recovery from many sources in general.
The book by Hoke is one of the all-time available references of information. I either have a copy of the book or photocopy for educational purposes.
I commonly work with materials left at sometime mine sites. I have worked with boards. I mesh and grind the mine site materials,then table these on a Wilfley to acquire a concentrate for either furnacing or leaching. Subsequently furnacing I granulate the metals to increase the surface area then do a dissolution in Aqua Regia. Using Nitric first on your granulated metal enables y'all to recover your silver past precipitation with either common salt h2o or Muriatic acid. Y'all will too deliquesce your Palladium in this process which can exist recovered later on. However Dimethylgloxime is expensive and possibly merely using the aluminium method that follows will enable you to recover a metallic for assay and auction.
If no argent is present I become to Aqua Regia (weak or strong),boil it down,add urea to remove any remaining Nitric and then conform my pH to 7. I and then add Sodium Metabilsulphite to driblet the metals,filter and dry. I then clean the powder with weak ammonia to remove any possible co- precipitated silver. Once again filter and dry and clean with hydrochloric or simply boil in water to lump it together.
Yous should be able to furnace this straight using just Borax [affil. link to info/product on Amazon]. Also add a small pinch of saltpeter to the charge before pouring into a suitable mould. Clay crucibles are good to use with this method. The gold should exist 99.99% or four nines equally they say.
If yous had Platinum in your solution and subsequently gilded recovery using Sodium Metabilsulphite (used for sterilizing bottles etc) you can use Ammonium Chloride or simply add aluminium foil(inside the periodic tabular array and reactive series) and let it do an substitution. This volition drop all metals as either a dark-brown or fine black pulverization which could besides include any gilded you have missed. Also if anything goes incorrect during the initial atmospheric precipitation procedure and y'all think you have lost metals simply dilute your solution with fifty% hot h2o h2o and add a pocket-sized amount of hydrochloric acrid and add together aluminium. Ensure there is enough hydrochloric to maintain a pH for the aluminium to work.
Undertake your dissolution again with your Aqua Regia on your dry powders and follow the precipitation process/recovery process. Never throw or discard solutions until these are finally tested with aluminium.
A further method to recover all metals from solution is to add together Soda Ash slowly to a boiling solution. It will slowly neutralize. This will drop all of your metals as a blackness pulverisation.
I would like to run across more information on the precipitate Hydrazine Hydrate every bit I have never used information technology before. What is its industrial use? Tin can someone propose? I am soon developing a leaching process suited for the materials I am interested in locally.
If you are using aqua regia to dissolve boards etc, aluminium will recover your gold which you will run across coming to the superlative as yellow gilded powder or flake. Tin can solder should exist cleaned from pins and points using something like hydrochloric before Aqua Regia. This can cause issues later as it will also bring downwardly your metals.
To be certain just filter the powders and dry. And so boil in Sodium Hydroxide at a pH of 12 for virtually two hours to covert the metals to an oxide. Once again filter and dry. Then place in an oven at 400 °C for virtually ii hours to convert this from an oxide to metallic.
I promise the above helps or that it tin at least tin rectify or get you out of trouble if something goes wrong.
Don Buckley
- Braidwood NSW Australia
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May 25, 2009
Q. Hullo,
I accept just started with gilded refining. I have dissolved my gold findings and gold plated pins in Aqua Regia; the solution turned a deep, almost black green color. I neutralized the nitric acid with Urea and added Ferrous Sulphate but nothing happened; no gold precipitated out of the solution.
Tin you please requite me advice?
Thanks in advance!
Johan Geyser
Hobbyist - Lephalale, Limpopo, South Africa
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June 14, 2009
Q. Dear friends. I am a medical practitioner, age 61. I accept been in exercise for approx. 35 years. My serious interest in gold refining is triggered past the fact that the alimony that I was promised will non materialize. I am stockpiling figurer pins, CPU's, and aureate fingers from the edges of boards. It is my aim to have 100-150 kilograms of pins, etc. before turning this into cash (income tax reasons.)I need all the basic help that I can get and then equally not to waste this opportunity. Sourcing fabric, i.e. computer boards etc, is non also difficult. I demand a basic users guide book or something like it so as non to do myself in or injure anyone. I know the danger of reactive chemicals. Delight aid me with a workable solution to reach maximum results. I must admit that I am enjoying the whole discovery to the envy of some friends and family!
I hope to hear from yous soon. Many thanks. Marker.
Mark McDonogh
New experimenter - Pietermaritzburg. Southward Africa
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July 22, 2009
Q. I have been working with this for about 6 months, but have spent a lot of time and money and piece of work trying to drop and recover the gilded out of calculator boards and phone boards.
Use urea have followed directions I use aqua regia, I urea, I utilize sodium metabisulfite , I then start cleaning , Wash , so add together back HCL, eddy, then clean water, then ammonia, and then h2o, and so refilter.
Then I am getting my precipitant is well-nigh a silver, nickel platinum color. I see specks of red. I use a torch gas MAPP with Air.
I then tried oxalic acid to drop with, and so same cleaning procedure.
I can take criticism merely please be kind. I tried last calendar week subsequently my precipitant dropped good colour nice yellow pulverization. I used lye to boil trying to clean out annihilation left. I am withal getting the same driblet when heated. And the same platinum, nickel, silverish color result when torched. Suggestions please.
John Gamel
retired ,income - helena Alabama
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T-6 Leaching for Gilt Recovery
November 17, 2009
Q. I recently started gold recovery and have used aqua regia just I heard using a method called T-6 leaching an easier method. Does anyone know the T-vi method?
Lynn Tucker
hobbyist - Elgin, Texas
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November 11, 2010
Q. I am responding to Lynn Tucker of Elgin Texas who asked about T-vi. I know it was a year ago. I just now found this site and would like to find anyone familiar with T-six.
Steve Rogers
- Denton, Due north Carolina USA
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January 16, 2010
Q. I need an culling for sodium metabisulfite/ferrous sulphate/ sulphur dioxide gas. Apart from these what else tin be used as a reagent in golden refining procedure.to get 99.99%purity.
anil chavan
chore work - sangli,mh,Republic of india
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February 4, 2011
A. Honey Anilji,
Please utilize Hydrazine Hydrate to precipitate gold from Aqua regia afterward neutralising the solution with 25% urea solution.
This will give y'all the necessary result in recovering pure gold.
regards,
prakash v pai
- India
^
Feb 9, 2010
! For those who are a chip farther along in the chemistry side; I stumbled onto a patent using 1:5-ish ratio of Hydroquinone to Oxalic acid for a reducing agent. Information technology works really, really well!
The purification steps after reduction cutting down to virtually nil. This is for make clean solutions though, the oxalic acid brings downwards the firm. The pulverisation is a alloy of particles 3 micron to 15 micron I believe.... thought I would share.
Donovan Vanderbloomen
- Lake Geneva, Wisconsin
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May xix, 2010
Q. Hello,
First I want to acknowledge I am not a chemist, I did take chemistry merely I was doing my own experiments with the THC. So I'm chemistry limited and I hope y'all guys don't tear me upwardly too bad for asking questions which to you are dumb. I am not a chemist just I am a metallurgist and I am puzzled when I read about all the work you guys go thru to isolate these metals with costly and environmentally unsafe chemicals? Do you do this for fun or to experiment? I ask because a expert furnace tin separate with very impressive results.
Harold Bawlcz
metals enthusiast - Chicago, Illinois
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February 4, 2011
Q. Your kind attn: Mr.Harold Bawlcz,
metals enthusiast - Chicago, Illinois
I am quite curious with the separation technique y'all take put forward in this site. I would similar to know more & am interested in trying out the aforementioned for better results.
Could you lot be more specific about separation of metals as mentioned by you?
Awaiting for your response.
regards,
prakash five pai
- India
^
September 23, 2010
! Hello,
I read with interest the observations regarding the recovery of golden.
It seems advisable to use bones microchemical test to identify elements present in solution.
"liquid that is a vivid bluish or sometimes a vibrant green" may indicate copper is present : on dilution the solution is blue and adding muriatic acid, the colour turns green.
I work on gold produced via transmutation of silver. The dissolution of silver with nitric acid then adding HCl , heating and filtering silver chloride gives a solution that contains copper (also role of the initial silver alloy ) and eventually aureate.
Chromatography of the solution with north-butanol/HCl and the exam with p-dimethylaminobenzilidenerhodanine, gives a reddish spot at the front end of the eluent that indicates aureate, sensitivity is 0.two µg.
To recover gold from the solution (hundreds of micrograms) , I go on, outset, to a concentration of aureate with ethyl acetate, then I care for over again the organic phase : evaporation, dissolution by aqua regia, ... and precipitation with hydroquinone as recommended by Beamish, considering this precipitant gives a workable precipitate gratis of copper and other elements.
To follow the precipitation of gold, I employ chromatography of one drop of the solution with n-butanol/HCl and the test with p-dimethylaminobenzilidenerhodanine.
Albert Cau
- Toulon - Var - French republic
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October ix, 2010
Q. 1. Tin I use Sodium Sulfite (Na2SO3) to precipitate gold from aqua regia? What is the different if I utilize Sodium Metabisulfite (Na2S2O5), Sodium Sulfate (Na2SO4), and Sodium Sulfite (Na2SO3)? What is the best precipitant from all of that?
ii. If I want to neutralize the water (there is no contain gold anymore), tin can I utilize Sodium bicarbonate (NaHCO2)? Are the rest of the metal will precipitate with the sodium bicarbonate, or only with sodium carbonate (washing soda) [affil. link to info/product on Amazon] the metal will precipitate?
Thanks, sorry if I inquire likewise much.
Handy Tan
- Indonesia
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September 25, 2011
A. Hi, mr. handy tan
you are using smb for Au precipitation, but according to my opinion it will be meliorate to use ferrous sulphate. Second, for neutralisation you add urea and add zinc grit to reduce all metals, some other matter is for recovering colloidal particles y'all add very few polyelectrolyte in your waste solution.
bhupesh mulik
lignin research center - mumbai,india
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September xi, 2012
A. I did my final newspaper on the gilded precipitate from aqua regia solution using hydroquinone. It was so simple and attaining 99.99% purity after firing was an incredible please.
Refining the argent chloride left over from the solution was a little more of a chore but I got to inside 80%.
Just wish I could remember the volume information technology was all published in.
Graham [last proper noun deleted for privacy by Editor]
- ottawa ontario canada
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May 19, 2012
Q. Hullo. Can somebody help me how tin I precipitate silver from aqua regia? Thanks.
Bujar Bakiu
- Skopje, Macedonia
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September xiii, 2019
A. Silverish is insoluble in aqua regia every bit AgCl, a very pocket-size portion will dissolve in a high chloride solution as AgCl2, diluting the aqua regia with water will lower the chloride content and convert AgCl2 into insoluble AgCl.
Basically you volition not have much silver dissolved in aqua regia considering it forms an insoluble common salt of silver.
Richard Butcher
precious metal refiner - Selma oregon
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