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.
WhatsApp: +86 18221755073
Help Support Gold Refining Forum: This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others. ... 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 ...
WhatsApp: +86 18221755073
Using Nitric acid to dissolve Brass. Thread starter Fishnbiker; Start date Mar 12, ... 4 Hole Sizes Metal Silver Casting Melting Templates Ingot, for Melting Casting Refining Gold Silver Copper Aluminum Brass Precious Metals DerJingX. $25.49. UtechSmart USB C Hub, Ethernet Multiport Adapter 6 in 1 USB C to HDMI Dock Compatible for MacBook Pro ...
WhatsApp: +86 18221755073
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 to 3 …
WhatsApp: +86 18221755073
For aqua regia refining I completely agree with your advice against using nitric acid to remove silver chlorides. The process I was talking about does not use aqua regia, only nitric as a parting acid. The resultant gold sponge, which has never dissolved, is slightly contaminated with silver but it is metallic silver, not the chloride.
WhatsApp: +86 18221755073
The classic procedure for nitric acid elimination is repeated boiling to near dryness with the addition of hydrochloric acid with some sulphuric acid near the end. This is a lengthy and …
WhatsApp: +86 18221755073
Beginners Gold Refining Process Forum . Pins in Nitric acid. Thread starter hazza001; Start date Dec 30, 2011; Help Support Gold Refining Forum: This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others. ... I've disolved 1,2 kg of gold plated pins in nitric acid (about 3l). those pins are from IDE ...
WhatsApp: +86 18221755073
Concentrated nitric is a far slower reaction than 50/50 nitric and it can surprise you unexpectedly if it becomes diluted at a given temperature as it consumes your nitric, then starts to heat up due to a more efficient reaction that greatly speeds things along even faster.
WhatsApp: +86 18221755073
So I dissolved some 35% silver nickels with nitric acid with the end goal of recovering .999 silver. I was assuming that after all the nitric was used up, I could add a piece of copper into the solution and silver metal would be precipitated. That did not happen and the copper did not dissolve...
WhatsApp: +86 18221755073
Help Support Gold Refining Forum: This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others. J. john_paok ... My scrap is 40grams of ppins and boards from cell phones and I had add 80ml Hcl acid and 10ml nitric acid and o teespoon 5grams of sodium nitrate. Then I had add 25 grams Urea and 20 grams of SMB. ...
WhatsApp: +86 18221755073
Using nitric acid to remove base metals works very well, even for pins, if you remove the solder, and the pins are not made with an alloy of tin like some of the bronze (copper tin alloys) metals. ... 4 Hole Sizes Metal Silver Casting Melting Templates Ingot, for Melting Casting Refining Gold Silver Copper Aluminum Brass Precious Metals ...
WhatsApp: +86 18221755073
Dear Refiners I've been scrapping various kinds of metal for some time now, and recently started looking into recovering silver from plated items. My approach has been to reverse electroplate Silver plated items using a salt solution in a stainless steel bowl as the negative cathode, and the...
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
I use the Bisulphate reaction because it is easy to do a small batch with minimal risks - enough for one or two batches of gold or silver. Apart from the Nitric acid (which I use) the waste is sodium or potassium sulphate And an excess of sodium bisulphate added to force the equilibrium reaction to nitric acid.
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
The electrolyte was a batch of spent nitric acid that had been cemented using copper. The result of this first pass is the loose powder in the opening photo. ... 4 Hole Sizes Metal Silver Casting Melting Templates Ingot, for Melting Casting Refining Gold Silver Copper Aluminum Brass Precious Metals DerJingX. $7.99. Kitsch Gold Metal Claw Clips ...
WhatsApp: +86 18221755073
Is there a way to extract gold using a chemical process without using nitric acid ( most people can't buy this here ) ... Forums. New posts Search forums. What's new. New posts Latest activity. ... for Melting Casting Refining Gold Silver Copper Aluminum Brass Precious Metals DerJingX. $200.00. Hydrotreating and Hydrocracking Processes in ...
WhatsApp: +86 18221755073
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."
WhatsApp: +86 18221755073
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
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
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, ceramics, etc.) are separated from the solution by either filtering or decanting the solution into ...
WhatsApp: +86 18221755073
I recently purchased four 2.5 liter bottles of nitric acid that someone listed here on the forum. It turns out that I lived within 5 miles of them. Amazing. Anyway I got a super deal on the acid, 5 gallons of HCL, and other goodies. The nitric acid included a …
WhatsApp: +86 18221755073
The two acids which are used in this process are concentrated hydrochloric and nitric acids. Nitric acid is very corrosive. When combined with hydrochloric acid, the fumes become much more corrosive. So corrosive, in fact, that they will rust the highest grades of stainless steel with less than 1 second of exposure. For this re…
WhatsApp: +86 18221755073
Well to conserve on nitric acid and to process large batches (12 pounds) i dont go over that usually, use 4 5000 ml conical flask a stopper and a hose in top in which the nitrogen dioxide gas (red gas of death) travels through from the first hose to the second conical flask where the hose is submerged in the water which turns back into nitric ...
WhatsApp: +86 18221755073
I started with 1100 grams of nickels, then added 50/50 ratio of distilled water and 67% nitric until most of them were dissolved. Then I removed the liquid and added some sterling silver to use up any nitric. Then I removed the sterling and filtered the liquid.
WhatsApp: +86 18221755073
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 dissolve, filter and retrieve the gold from the substances bonded to it.
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073
(2) For the equivalent of 50/50, 70% nitric, use the 50% acid and add 27%, by volume, extra water. For example, you could add 270ml of water to 1000ml of 50% nitric. To make up exactly 1 liter of 50/50, combine 787ml of 50% nitric with 213ml of distilled water. By the way, gold4mike, when you dilute 70% nitric 50/50, you end up with 41% nitric.
WhatsApp: +86 18221755073