The bowl weighed 25.2 oz (713 g). I cut the bowl into pieces and melted it down into a bar slightly smaller than a US dollar bill and almost 1/4" thick. I processed the sterling bar using electricity (12V 10A battery charger) and and electrolyte of left over copper nitrate from previous inquartations and cementing reactions (see on my website).

Jun 1, 2013. #2. Yes you can use it in all of the processes we use nitric for, diluting it 50/50 with water for silver or base metals, or adding it straight to HCl to dissolve gold with aqua regia, 67% to about 70% (68% azeotropic nitric acid) is what we use in these processes. When beginning to use nitric there is a learning curve, nitric is a ...

Parting with Nitric Acid (two chapters); Recovery of Silver from Nitrate Solutions; Refining by Sulphuric Acid; Parting by Electrolysis; Electrolytic Refining of Gold; Separation of Platinum from Gold; …

The residual nitric in solution has to be eliminated to drop the gold or it keeps re-dissolving and eventually you get a red cloud when the peroxide is exhausted and you're burning off the residual nitric. To prevent this use sulfamic acid to kill the excess nitric, unlike urea, it does not generate the red NO2 cloud.

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 …

Standard 67-70% Nitric is usually used in 2 ways: (1) full strength when making up aqua regia with HCl and (2) diluted 50/50 with distilled water to dissolve silver (or, certain base metals). (1) For aqua regia, the 50% could be used with little sace in speed. (2) For the equivalent of 50/50, 70% nitric, use the 50% acid and add 27%, by ...

Location. John Day Oregon. Mar 10, 2024. #9. LootGoblinsBazaar said: "Google" Combine solutions of calcium nitrate Ca (NO3) and sodium carbonate (Na2CO3) to yield sodium nitrate and calcium carbonate NaNO3. Sodium nitrate will remain in the solution and calcium carbonate will precipitate out as a white solid.

Close approximations: - 7 pounds of silver per gallon of 70% nitric - 100 tr.oz. per gallon - 26.4 tr.oz per liter - 822 grams per liter - 1 gram per 1.22 ml For your 110 grams of silver, therefore, it will take about 134 ml of 70% nitric. For several reasons, these figures never come out to be exact - due to reaction temperature, amount of dilution, …

7,731. Location. Norway. Jan 16, 2024. #2. mtntrekr2 said: Before I try and find myself in trouble. I have seen others use a 5% solution of nitric acid for the recovery of silver from the mylar.

Alabama. Aug 14, 2022. #4. escrappy said: Dear Members, I'm new to refining and wish to learn the step-by-step process of refining and segregating Gold, Silver, and Palladium from E-scrap. Below are the chemicals which i have secured for the task, Sulphuric Acid. Nitric Acid.

Always dilute by carefully pouring acid into water. Using the concentrated acid to part gold and silver is not a good idea. It is just too dangerous. Nitric can be hard to get, and can be expensive, it is not a safe chemical but it can be worked with if done safely. With the sulfuric you may not get a second chance if crippled for life.

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 alloy it accordingly down to 18kt or 14kt. This gives me a safety margin so the gold is a slightly ...

Jul 20, 2023. #3. Martijn said: Reverse plating water cell creates silver oxide, which is black. it is not 'deposited' on stainless steel bowl, that is done with nitric. it just stick to it or settles there, i imagine. In a salt water cell, you will create silver chloride. Silver chloride does not dissolve in HNO3.

After viewing a few videos on Youtube, I thought to inquire here about using Nitric acid to dissolve brass. The reason for this is hopefully to dissolve/remove a broken fuel jet needle in a carburettor needing rebuild. The theory sound easy enough (with regard to dangerous chemicals use), but there are a few questions as to access to a small ...

Mar 27, 2022. #7. One of my first experiments with trying to clean some small nuggety placer Gold went like this. First, use warm HCL only, diluted with distilled water by 25%. Let soak for 48 hours. Decant and wash 3 times with distilled water. Dry, repeat this time with 67% nitric cut 25% with distilled.

Oct 3, 2016. #1. So this is my third refining of silver using nitric acid and cementing with copper. But this time I'm refining not just sterling silver but silver coins from Mexico Canada and even then us I believe. Many of these coins have 80% or as low as 72% silver content. So I put roughly 200 grounds this silver that I explained some of ...

Jun 27, 2009. #1. 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 ...

Salt NaCl and nitric acid HNO3, would make an HCl, HNO3 and sodium in solution, basically a form of aqua regia, since the gold was very thin it dissolved in this solution and plated back out on un-dissolved base metals, the only way to get it back would be to dissolve every bit of base metals, the problem with whole circuit boards is there can …

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 …

Parting by Electrolysis; Electrolytic Refining of Gold; Separation of Platinum from Gold; Treatment of Cyanide Precipitates; 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.

If you are using nitric as your leach the reaction with zinc is not as volatile so ing/boil over is not as much of a problem when using shavings. When I was leaching CATs (HCL/Cl leach) I used what you see in the pic - They are pure zinc fittings used by electricians for connecting conduit together &/or connecting conduit/wire to …

You don't need 3 to 1 or 4 to 1 AR. As an example, for one certain type of application, I always used a 50% Nitric/45% water/5% HCl to dissolve the gold. (b) When dissolving a quantity of metal, both the HCl and HNO3 are …

Waste treatment: Neutralizing the solution will leave it at pH 7, (neutral) with a whole bunch of chemical toxic salts left in it. Raising the pH in steps, filtering in between and doing so up to pH 11 will ensure the chemical salts are pushed out to below acceptable emission levels for disposal.

Here in india I am getting all acid at about 40 rupees per litre means half a dollor for a litre of every acid but purity is undefined. ... Nitric Acid, HCL and H2SO4. Thread starter avigp193; Start date Nov 4, 2023; Help Support Gold Refining Forum: This site may earn a commission from merchant affiliate links, including eBay, Amazon, and …

Aqua regia can be 4 to 1 .or. 3 to 1 or just drop by drop nitric . You need heat .stannous chloride .very important and urea to make sure you don't have access nitric .and then precipitation . You have to do it step by step .and test with stanouss as you go .and it's deferent factor if you have other metal with gold.

I already have 2L of concentrated nitric to use For aqua regia. But looking for a cheaper alternative for dissolving base metals, from gold filled scrap. I've seen Geo videos on the poor man's nitric, using sulfuric acid and nitrate salts in e-scrap. But didn't know if it was a viable source of acid for good filled scrap.

2,953. Location. Alabama. Mar 10, 2024. #5. The practical difference between AR ( Nitric acid and Hydrochloric acid) and Poormans AR ( Hydrochloric acid and a nitrate salt) is heat. This is one of the reasons for using decent glassware as well. The hardest part of both is not over using the nitrate.

279. Jan 9, 2014. #10. There is one other way to refine silver without nitric acid. It can be done in a furnace such as a reverbatory furnace or some type of blast furnace. I have first hand experience at this. The silver needs to be melted without a flux cover so that it is constantly exposed to air.

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 …

The bead is boiled in nitric acid to dissolve the silver (a process called parting), and the gold residue is weighed. If platinum metals are present, they will alter the appearance of …

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 nitric acid (Dnoxx). With our method you won't need any neutralization, simply because you will not use excess nitric ...