Refining Gold Using Nitric Acid

alternative to nitric acid | Gold Refining & Metal Extraction …

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.

amount of nitric acid needed

The 134 ml of nitric is about 2.1 Moles (.134 x 15.6) and the 110 grams of silver is about 1.02 Moles (110/107.87), for a Molar ratio of 2.06:1 The equation (or combination of equations) that actually fits the bill is dependent on the conditions - mainly temperature, nitric acid strength, and whether or not the gases produced are condensed and ...

Gold Parting using Nitric Acid

The process of parting gold with nitric acid is old, and probably dates from the discovery of nitric acid itself; it is one of the simplest parting processes, and does not require a costly plant or much manipulative skill.

Nitric acid

Hello I'm trying to use sodium nitrate + sulfuric acid to make 70% nitric acid. I understand the formula is a 2-1 mole = 1-2 mole nitric. But I can not get this to turn out right. If I add 1700 grams of sodium nitrate and 850 grams of sulfuric acid and 550 grams of water this should give me almost 2 liters of nitric acid but it's not.

AP vs Nitric acid Pros and cons? | Gold Refining & Metal …

AP is slower than nitric is one of the biggest drawbacks I see to it. A second smaller issue is the tendency of strong mixtures of AP (excess heat and/or peroxide) will dissolve some of your gold whereas nitric won't. The dissolved gold is not lost just tied up until the solution gets saturated with dissolved base metals.

boiling off nitric acid | Gold Refining & Metal Extraction …

Hi GREAT forum, i have been doing lots of reading and am taking slower steps now .After dissolving a watch casing in nitric acid all that remains is the gold foil .should i filter this and then put the foils into solution or boil off the nitric acid first before putting gold into solution.My idea being that i could boil the nitric solution to save time later as boiling the gold …

Refining 10kt and 14kt Gold

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.

Gold Filled nitric acid saving process | Gold Refining

I decided to aqua regia my gold filled without using nitric to dissolve base metals first. - Aqua regia gold filled all but stainless pins dissolved - added 4-5 times as much water and filtered solution-Added smb and let everything settle over night - decanted not filtered into bucket-wash with water twice decant -use boiling water and add to settled metals, goes yellow right …

Gold and silver testing acid | Gold Refining & Metal …

To start, make three test solutions as follows: Bottle #1: Schwerter's Testing Solution - Mix 1 gram of Potassium Dichromate with 22ml of concentrated Nitric acid and 8ml distilled water. Bottle #2: Mix 1 part (by volume) Hydrochloric acid and 50 parts of Nitric acid. Add to 12 parts of distilled water. Bottle #3: Aqua Regia - Mix by volume - one part Nitric acid …

How to Refine Gold (with Pictures)

Scrubber Design

Help Support Gold Refining Forum: This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others. T. Tahmoures Active member. Joined Dec 20, 2021 Messages 34 Location Middle east. Aug 1, 2022 #1 ... I'm using nitric acid for base metals, aqua regia for dissolving gold and sodium metabisulfite for precipitating ...

Pins in Nitric Acid | Gold Refining & Metal Extraction Forum

The figure is probably at least .45 gallons of 70% nitric per pound of copper, when using 50/50 nitric. This is all theoretical. When the reaction produces fizzing, there is also some nitric loss into the air. All in all, in practice, it takes very close to 1/2 gallon of 70% nitric acid (1 gallon of 50/50 nitric) to dissolve 1 pound of copper ...

Aqua Regia vs. Acid Peroxide.

Gold Refining Processes. Chemical Processes & Chemical Discussion . Aqua Regia vs. Acid Peroxide. ... Once silver and the platinum metals mix, they will dissolve along with silver, using dilute nitric acid----so separating them can be involved. They are generally best recovered when parting silver in a silver cell.

MAKING NITRIC ACID QUESTION | Gold Refining & Metal …

Question, I AM NEW TO REFINING SCRAP SILVER AND GOLD. WITHOUT GOING INTO WHAT I NEED TO REFINE, I DO NEED TO MAKE NITRIC ACID DO TO MAKING THE VARIOUS PROCESSES AFFORDABLE. the question IN GENERAL FORM, IS NITROGEN THE SAME AS NITRATE, (Or will nitrogen added to sulfuric acid/water, make a Nitric acid.) i …

Separating Silver from Gold Using Nitric Acid

This is a short tutorial demonstrating the separation of silver and gold using Nitric Acid. The initial weight of silver/gold mix weighed 41.5 grams. Here is the initial silver gold mix used: Please post your comments and suggestions as usual. I've provided this video as a …

Nitric and Palladium | Gold Refining & Metal Extraction …

hcl acid alone will not dissolve gold or copper. add the material in question to hcl acid in a chamber big enough to hold the volume of material and chemicals with 1/4 of available space left. add H2O2 (peroxide) to the mix of a ratio of 1 US cup to 1 US gallon to start the reaction. it will immediately turn yellow then quickly turn green. add a source of oxygen such …

Re-using contaminated nitric?

Beginners Gold Refining Process Forum . Re-using contaminated nitric? Thread starter heliman4141; Start date May 24, 2014; Help Support Gold Refining Forum: ... There are no more H+ ions in solution (assuming you used sufficient copper to use up all the nitric acid). Cementation works in a similar way. Iron is more reactive than copper, so when ...

Urea, its use in refining

At the request of Freechemist, I am starting this thread for the discussion of the use of urea in refining. Please note that the use of excessive nitric acid is wasteful and requires either time consuming multiple evaporations of the acid to drive off the excess nitric acid or the use of urea to consume the excess nitric and drive it from the solution.

The Ultimate Aqua Regia Refiner's Guide | Shor …

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.

Refining Karat Gold and Silver Jewelry using …

Aqua Regia (AR) is the combination of Hydrochloric Acid (HCL) with Nitric Acid (HNO3). Together they have the capability to dissolve gold and platinum. Some AR recipes calls for 4:1 or 3:1 HCL:HNO3 and then neutralize the excess …

Pins With Nitric Acid | Gold Refining & Metal Extraction …

Spend a little time understanding how to use aqua regia, using a little excess HCl and limiting the nitric acid to only the amount needed (no more) by adding it in small amounts, using heat and giving time for the nitric to react and oxidize the gold and be consumed in the reaction, so that after gold is in solution you have little, or no free ...

cementation with copper

f. Regenerate nitric acid by destructive distillation of the copper nitric in a glassware apparatus. Brown gas is bubbled into cold distilled water. Copper Oxides can be converted to Acid Peroxide with HCl. 2. AR or HCl-Cl solutions after SMB: a. Residual PMs precipitated by Cu saturation, let settle, and siphon, PMs in black powder. b.

Aqua regia a lot of SMB...

Hello! Thank you for being here, I refine gold-plated contacts, of course based on videos. In the first step, I etch away the excess with nitric acid, dissolve the gilding in aqua regia, and reduce it with SMB. However, unlike the videos, I have …

Using Nitric acid to dissolve Brass | Page 2 | Gold Refining …

If the carb is made of "die cast" (which is primarily zinc) nitric will destroy the carb as nitric reacts with zinc If the carb is made of cast aluminum the nitric will have little or NO effect on the carb as nitric does not react with aluminum So if it was me - I would test the outside of the carb body with a drop or 2 of nitric to see how it reacts - before using the nitric on the …

Nitric acid

When working with silver, we usually dilute our concentrated nitric acid with an equal volume of water, so the 38% will work well right out of the bottle. When using it to make aqua regia, we usually use it in its concentrated form, but the 38% will still work fine, just adding a little more water to the AR. Dave

65% Nitric acid | Gold Refining & Metal Extraction Forum

The normal recipie is 4ml:1ml; 31% HCl: 70% Nitric Acid per gram of gold to be dissolved. Your nitric is 15% : 70%/15% = 4.67 So you will need roughly 4.67 mL of 15% nitric acid to 4 ml of 31% HCl per gram of gold to be dissolved. I rounded up so you could easily get by with 4.5mL:4mL of your nitric to hardware store muriatic acid. Steve

Sulfamic acid for denoxing solutions | Gold Refining

Basic theory: Excess Nitric acid in a AR solution that is pregnant with AuCl will prevent the gold being precipitated using your preferred method of choice (SMB, ferrous II Sulphate etc.) The plan is to remove this excess Nitric leaving a solution that is ready to cool, filter, and process in the normal way in order to add your precipitant of ...

Sodium nitrate ratios fo AR help please!!!

Welcome Martin! This from some information that Lazersteve posted & I have saved & use when preparing my Poorman's AR. I hope it helps! "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) …

Use of Nitric to get rid of base metals | Gold Refining

I see no reason to use nitric at this point ($$$), when you can leach most base metals with another acid like sulfuric acid, or hydrochloric acid, or even weaker acids like citrus acid or even vinegar depending on the base metal and ore. ... and then refine the gold again putting it back into solution and repeating the refining process for ...

nitric turned a dark rust color

In that respect, I'd like to take a shot at this: Try first more 50/50 nitric acid/distilled water. Heat it to 68C for an hour. Let it cool and settle to room temperature. Carefully decant the solution and save it for silver recovery. Repeat this process with concentrated nitric acid. Save the solution for possible palladium.