"NOTE: When substituting nitrates for nitric acid in Poorman's AR here are some handy numbers: 1. When used to dissolve gold powders use 4 mL of 31% HCl per gram of gold plus: 1.343 g NaNO3 (sodium nitrate) per gram of gold to be dissolved. or 1.597 g KNO3 (potassium nitrate) per gram of gold to be dissolved. 2.
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Help Support Gold Refining Forum: This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others. 1; 2; Next. 1 of 2 Go to page. Go. ... Save the Na/K sulfate salts from the nitric acid reaction and use them to make more NaNO3 using saturated Ca(NO3)2 solution and simple filtration. Steve . Reply. Reactions ...
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Help Support Gold Refining Forum: This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others. ... Hey,just red somewhere on the forum that someone was looking for an alternative to make aqua regia from nitric acid and hidrochloric acid and used Potassium Nitrate in stead of Nitric acid and mixed with ...
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This is a free tutorial on gold recovery method using nitric acid to extract pure gold from old gold and scraps of gold by process of dissolving unwanted metals. When I use this refining method, I regard the purity of the gold as 22kt, and I …
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Help Support Gold Refining Forum: ... Baking soda would neutralize all acid, including the HCl, so if you had gold, and most of the other metals in solution it would precipitate if you neutralized the acid. ... all the nitric was used up. Harold's response in this thread, that it could also mean that all the HCl is used up and there is still a ...
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First up, get cozy with your gold refining kit. Read the instructions, and get to know what each chemical and tool in the kit does. You'll usually find nitric acid, hydrochloric acid, glassware, filters, and safety gear. Knowing your kit inside …
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Greetings How much nitric acid needed to work on 200g gold plated pins for gold refining Without counting the nitric that used for making AR Sent from... Forums. New posts Search forums. What's new. New posts Latest activity. Members. Current visitors. Gold price calc. Silver price calc.
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Instead of nitric acid can I use Sodium nitrate for refining silver... or are they the same. Forums. New posts Search forums. ... I've always used bought nitric acid for my silver refining needs. Göran . Reply. rfran7788 Member. Joined Jun 24, 2014 ... but for silver from other processes such as AR used for gold that contained some silver that ...
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Electrolytes seem to vary from a silver nitrate only solution to electrolytes with "some" free nitric acid. "A typical silver-refining acid bath would be 200 grams per liter of silver nitrate and 30 grams per liter of nitric acid (Recovery and Refining of Precious Metals, C.W. Ammen, 1984). What would be an appropriate level of nitric acid to use?
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Q: What acid is used for gold refining? A: The main acids used in gold refining are: Aqua regia (3:1 mixture of hydrochloric and nitric acid) – primary gold dissolving agent; …
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one method discussed was with the use of persulfuric acid or Peroxymonosulfuric acid H2SO5 solution saturated with copper as an electrolyte. the silver plate would go into solution and be cemented out on to a piece of copper in a corner of the cell away from the anode and cathode. cemented silver was collected in a glass container sitting in ...
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Nitric acid functions to oxidize the gold and transform it into gold ions. Meanwhile, hydrochloric acid supplies chlorine ions, which assists in dissolving gold ions and keeping them in the solution. The semi-refined gold from the previous step is used as an anode or a positively charged electrode, and a very thin sheet of purified gold is used ...
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Ok so been trying to find a place to ask my question. I've been trying to make nitric acid for silver recovery. I just started off by melting a few price of junk jewelery and eventually start doing reverse electro plating on silverware. Now I've …
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Hello all, While browsing the internet i stumbled upon a product that claims to be a substitute for Nitric Acid in Aqua Regia. This Chemical is called MX3, but im having trouble determining the actual contents of the white powder that claims to be "A superior, dry, non-hazardous substitute for nitric acid when making aqua regia."
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If you decant while the reaction is still in it's vigorous state, it should contain gold. When the nitric acid is depleted, there is nothing to hold the gold in solution. If the reaction stops and the the solution is still warm AND the nitric acid is used up, the gold will cement out faster than you can lift the container and pour out the solution.
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3% H2O2 is mostly water, this dilutes the nitric acid, so you need to take this extra water into consideration. Nitric acid or silver nitrate solution can be concentrated by evaporation, (nitric acid azeotropes at 68%), silver nitrate …
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Whether you're refining gold using nitric acid, sodium nitrate, or MX3, the procedure is essentially the same and pretty simple and straight forward: Metal is dissolved into solution. The materials that didn't dissolve (stones, plastic, …
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Read how Nitric Acid is used for Etching, cleaning stainless steel and glassware, silver refining and purifying, inductively coupled plasma mass spectrometry, gold recovery, and passivation of stainless steel. ... This combination produces aqua regia, a corrosive reagent that is used in gold refining processes. It is made by mixing nitric acid ...
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This enables the nitric acid to clean the gold, such as gold nuggets or free gold taken from black sands. Gold acts like a sponge and absorbs nitric acid. 911 Metallurgist is a trusted resource for practical insights, solutions, and support in mineral processing engineering, helping industry professionals succeed with proven expertise. | How To ...
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Also worth asking whether you want the Nitric acid to dissolve away base metals, or only to refine the gold at the end. If you are wanting to dissolve away a lot of base metals, then you really need reasonably concentrated Nitric acid, if you are just wanting to refine some foils, the PMAR or even bleach will do the job.
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Each alloy was rolled out in the same manner as was adoped for the nitric acid parting; 20cc of strong sulphuric, 92 per cent., acid was used in each case, and the cornets were boiled for one hour. The resulting gold was much paler in colour than when nitric acid was used on similar alloys.
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The process of refining gold requires reactions among chemical compounds, and the key to the refining process is a highly corrosive liquid called aqua regia. This combination of acids is integral to the extraction and purification of noble metals, including gold and platinum. ... While neither hydrochloric acid nor nitric acid will dissolve ...
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Gold processing - Refining, Smelting, Purifying: Gold extracted by amalgamation or cyanidation contains a variety of impurities, including zinc, copper, silver, and iron. ... However, it is sometimes used as a substrate for platinum catalysts employed in the production of nitric acid. Chemical compounds.
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To refine gold with nitric acid, you will first need to blend the nitric acid with hydrochloric acid to produce aqua regia. Then, you will need to …
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The nitric acid from the excess of aqua-regia used in the digestion is removed either by boiling or chemical reaction. To recover the gold as metal a reducing chemical is added to selectively …
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Initially, dilute nitric acid is fed into the reactor over a 30 min. period to ensure the reaction is not so violent as to destroy the grain and form a fine particulate material. ... Discussion and Conclusions The inquartation and parting gold refining technique is capable of producing up to 99.99% pure gold and is considerably easier to ...
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Reagent grade is a way of describing high quality---acid without contamination. I used reagent grade HCl for washing my re-refined gold. Reagent grade nitric is recommended for making testing solutions, to insure that you aren't contaminating the …
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There are things that I like to use nitric acid for and when I need it, I just make my own batch up to use. It is easy and in fact, I have another ... None of the gold recovery and refining processes, that I know of anyway, use lye at all. Lye is used in some silver processes. Reply. R. randydnesselrotte1 Member. Joined Jun 21, 2021
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But . . . I suspect this is not actually what you want to do. The term "neutralize" is used incorrectly when people talk about removing excess Nitric acid from a AR solution that now contains some dissolved precious metal. Urea and Sulfamic acid are used to convert excess Nitric acid in solution before precipitating Gold.
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Urea is used by some people but the consensus on the forum is that it isn't needed if you manage your nitric uses or add a gold button to use up extra nitric at the end. Urea doesn't guarantee to remove all the nitrates and in some cases could form explosive compounds. It can also complicate things if you have PGM:s in solution.
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However, as the acid gradually loses its potency to dissolve gold because of this reaction, it is normally produced by mixing the two acids just before use. The mechanism that allows gold to dissolve involves the nitric acid acting as an oxidizing agent to produce trivalent gold ions (Au 3+ ) which then combine with the chlorine ions to form ...
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Add the gold to a container with nitric acid, muriatic acid, urea, and precipitant for 30 minutes. Pour off the acid, and clean the pure gold at the …
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Gold Refining with Nitric-acid-based Aqua Regia 1-2 hours per batch e-scrap, jewelry, black sands, jewelers sweeps very highly corrosive simple setup costs can be as low as $100, depending upon capacity and sophisitication about $1-$2 per ounce to operate silver content can slow the process significantly;
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1 cup of Urea (used to neutralize free nitrogen ions). Generally, only a pinch is needed for each refining batch. 1 pound of MX-3 dissolving agent (used with muriatic acid to dissolve your metal). MX-3 is a dry, crystalline, non-hazardous substitute …
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As I understand, if there's still free nitric and you stop adding copper, some of the cemented silver will re-dissolve until all the free nitric is used. But, if you continue to add copper and all the silver cements, and there's still free nitric, the nitric will digest the added copper until all the nitric is used up.
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Refining of Gold Slimes by Nitric and Sulphuric Acid; the Nitre Cake Method of Purifying Slimes. How Metallic Minerals Affect Silver and Gold Precipitation Gold, as it occurs in Nature, is never pure.
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When you use nitric, the cost will be higher than the yield. For 200 grams of copper or brass pins, you will need 800ml of nitric. From 200 gram plated pins, you can expect 0.5 …
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Here is the comprehensive list of gold refining chemicals used in modern gold refineries. ... Aqua regia (3:1 mixture of hydrochloric and nitric acid) – primary gold dissolving agent; Hydrochloric acid – removes base metals; Nitric acid – separates silver and platinum;
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Beginners Gold Refining Process Forum . sodium nitrate for silver & palladiium. Thread starter relpub3; Start date Aug 22, 2007; Help Support Gold Refining Forum: This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others. ... Hi, I know that nitric acid and distilled water solution can be used to dissolve ...
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Inquartation is the key to success. Yellow karat gold that's 10K or greater is difficult to dissolve. The gold protects the base metal from nitric, and the silver protects the gold from AR----so you have to either raise the gold content above 90%, or lower the gold content to about 25%----which is somewhat critical.
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