>

Effect of nitric acid pre-treatment on the extraction of gold …

Although gold does not dissolve in pure nitric acid solutions, some dissolution of gold in sulfide systems can be attributed to the formation of thiosulfate during the oxidation process (Marsden ...

>

Nitric acid

Which makes absolutely no sense by the way.. 2: 200gr of pins will yield about 0,5 grams of gold, if your'e lucky. so a couple of hours/days work and health and environmental risks further for what? 3: Roughly 4ml of nitric is needed for every gram of base metals, equals roughly 800ml of nitric for 200gr of pins. With nitric acid @ 50 …

>

Making poormans Nitric Acid

Finally ready to run several pounds of CPUs in the poormans Nitric acid. In my notes all I can find is a small post it note: 1 Lb Sodium Nitrate 1 qt. Sulfuric Acid (battery acid) 1 cup hot distilled water (to disolve the Sodium Nitate). I was wanting to verify that this is correct before I ended up making a big mess of things.

>

Aqua Regia process with nitric acid | Page 2 | Gold Refining …

The second is stronger. In fire assaying, the first nitric is about 1 part nitric and 7 parts distilled water. The second is 2 parts nitric and 1 part distilled water. In the pdf, the first acid is boiled for 2 hours and, since the total cycle time is 6 hours, I assume the second acid is boiled for 4 hours.

>

Acid Peroxide Process Information Thread Q & A's | Gold …

First and foremost, the name for the process, Acid Peroxide is a misnomer as the active ingredient is actually copper II chloride (CuCl2), so it should have been called the Copper II Chloride Etching process. ... Currently I'm stripping gold foil from cpus using straight Nitric acid and it works fine each and everytime. Whenever I introduce HCL ...

>

nitric turned a dark rust color

Repeat this process with concentrated nitric acid. Save the solution for possible palladium. To what's left, heat with aqua regia. Process this AR solution for gold and the platinum group metals (PGM's). The next time, start with a sulfuric stripping cell instead. You should know that copper consumes twice the nitric acid as the first …

>

Precious Metal Refining Using Hydrochloric Acid

Gold extraction and refinement. After the initial chemical bath, purifying pure gold is completed through a series of steps. These may include precipitation techniques and heating up pure 24-karat gold. Using hydrochloric acid is a key element of gold refining practices. Purifying Silver with Hydrochloric Acid Dissolving Impure Silver

>

Poor mans Nitric and Silver

This my video of using poor man's nitric acid to process gold fingers. Poor man's AR is HCl and a solid nitrate. PM's nitric acid will work on any material you would use nitric acid on, even silver, just used distilled water instead of tap water.

>

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 …

>

Homemade Nitric acid

I have used this "recipe" with success on e-scrap items: HOMEMADE NITRIC ACID Just mix as follows. (makes about 1.5 quarts) (adjust recipe for the volume you need) Take 1 cup of sodium nitrate and grind it to a fine powder in a blender / food processor. (Don't use the food processor for food again. Go get a cheap one at Goodwill!)

>

Gold Refining Process

Gold Refining Process. To present the essential points of all methods of gold refining commonly practised, as well as those of historic interest," was the author's purpose in this volume. The fifteen chapters …

>

Homemade Nitric acid

Then add another 1/2 cup of water to the blender container and rinse the residue into the 1 gallon jar. Stir the sodium nitrate and water mix and let that sit for at …

>

Nitric acid...

Beginners Gold Refining Process Forum . Nitric acid... Thread starter Watcher; Start date Mar 9, 2024; Help Support Gold Refining Forum: This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others. ... Hi, but all have nitric acid, the gold is already in HCL, I don't see a problem with distilled water …

>

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.

>

After nitric acid wash. (Gold, Aqua Regia, Gold filled)

I'm wondering what is the best process after a 50/50 nitric acid soak. I have Gold Filled jewelry that I am refining. I put about 5 ounces in my beaker... Forums. New posts ... Non-magnet gold filled material usually has copper brass or zinc as the base metal and can be treated with 50/50 dilute nitric acid to recover the gold for refining. But ...

>

Processing Sterling Silver without nitric acid | Page 2 | Gold …

Ok, so the nitric acid must be very diluted then. Can anyone recommend a water to nitric solution? Would 10% nitric acid and the rest water work? From what I understand a week acid solution will be influenced by current to deposit crystals on the other end of the circuit. The key here is a delicate balance between acid concentration …

>

Gold Recovery Correctly : 12 Steps

Muriatic Acid 34% HCL ~ Baume. 3. Hydrogen Peroxide - 3% but no greater then 5% 4. Stumpout by Bonide. ... This process can also be used to recover gold from CPU such as Pentium Pro, or Cyrix or older 486 …

>

Gold parting with nitric acid in gold-silver alloys

In the modern period, gold parting with nitric acid has been largely replaced by other treatments such as chlorination using the Miller process [11]. Nonetheless, nitric acid is still used today in the parting stage on the laboratory scale after cupellation assay. PARTING WITH NITRIC ACID IN GOLD ASSAY AND REFINING Gold parting consists …

>

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 …

>

MX3, A Replacement for Nitric Acid in Aqua Regia | Gold …

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."

>

alternative to nitric acid

Beginners Gold Refining Process Forum . alternative to nitric acid. Thread starter dickydonk; Start date Sep 7, 2016; Help Support Gold Refining Forum: ... So my question is when recovering gold from incinerated ic/ flat packs is there any alternative to nitric acid as I can't buy it here in Ireland Thanks . Reply. R. Refining Rick Well-known ...

>

lead /nitric acid | Gold Refining & Metal Extraction Forum

I have no experience with that process, but I interpreted what I read as the lead forming an impervious coating if boiled in concentrated nitric, not attaching itself to the gold. Nitric acid often performs far better when it is combined with some water----so don't attempt it without diluting----not much to be gained.

>

Processing Sterling Silver without nitric acid

Also the smell of nitric acid goes away, and it's hard for a new anode to dissolve in the solution. So I simply added some new ( silver cemented out ) copper nitrate solution into the cell, with a fresh new anode, and the process picked right back up again.

>

Dummies Guide to GOLD bullion refining at home as a long …

The hydrochloric acid will be used in conjunction with the nitric acid to dissolve and purify the gold after the other metal contaminants have been removed by the nitric acid. At this point, ... There are 2 additional items that we will require to process gold but weren't necessary for silver processing.

>

evaporating the Nitric acid

Beginners Gold Refining Process Forum . evaporating the Nitric acid. Thread starter Refiner232121; Start date Aug 25, 2011; Help Support Gold Refining Forum: ... i dont think you can effectively evaporate nitric acid from the solution. urea is the preferred method of removing nitric, just add a few pellets at a time until theres no …

>

How much Sulfamic acid is needed?

Beginners Gold Refining Process Forum . How much Sulfamic acid is needed? Thread starter bhilton; Start date Feb 4, 2024; Help Support Gold Refining Forum: ... Here are my amounts used:-250ml hcl-Dropped in 2.5ml 58% nitric acid at 0.5 increments.-Heated to a slow boil, ...

>

Nitric Acid Pretreatment Applied to a Refractory Gold …

This paper presents the results obtained by processing a gold and silver telluride mineral concentrate from a mine in Colombia. An acid wash, also known as acidification, was carried out, followed by oxidation with nitric acid as a pretreatment. Cyanidations of the pretreatment residues were carried out and the results were …

>

Pins With Nitric Acid | Gold Refining & Metal Extraction …

After diluted nitric and filtering I got 7.0 grams on yellowish dust, I repeated process with diluted nitric again and got 2.8 grams of grayish dust with visible gold flakes. ... Use a gold button to consume free nitric acid. (Harold's trick). Leaving some gold undissolved. ( a form of the above method) Three-evaporation method. (Procedure ...