Potassium Nitrate Borax Used In Gold Refining

Gold recovery from smelter slags | Gold Refining & Metal …

when i smelt gold pieces i add always borax, sometimes sodium carbonate and potassium nitrate. Gold melts forming a ingot and in the top i have the slag. A bit of gold is in that slag, because there is a decrease and matter is not created or destroyed so i save the slag of all funditions i do. when i have enought i crush them, and now i have a ...

Homemade Nitric acid

(use distilled water if you have it) Stir the sodium nitrate and water mix and let that sit for at least 1 hour. Now add 1 quart of sulfuric acid (auto battery acid). Stir the solution a couple times and let it set overnight. The next day pour off just the liquid without pouring off any of the white sodium nitrate residue.

Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

Borax, soda ash, silica, manganese Chapmans white recommended if silver recovery is desired Borax, silica, soda ash. High potassium or sodium nitrate recipes usually use litharge conversion Pbo-Pb with flour as a carbon source at about 1% flour to Litharge to produce a specific sized prill.

The Borax Method of Gold Extraction for Small-Scale Miners

A group of miners in the Philippines has demonstrated that borax, when used as a flux for smelting gold out of heavy mineral concentrates, is an effective and safer …

black ppt from nitric after trying copper cementation | Gold Refining …

I did 5 total smelts on the material. One using the potassium nitrate process from Manuel and 4 different tries doing it with the process from Harold. I ended up with about 15 lbs of a black sludge washed out from the bottom of the 3 gallon pail . Used a heater and heat lamp to dry out the sludge over 5 days.

Gold and tin mishap

Ok interesting, two different methods. so Nitre - (Potassium Nitrate) plus Borax. So is the goal is to oxidize the tin and then the borax will help separate the oxidized tin from the gold? Would anyone be willing to provide a chemical reaction? (I was a chemistry major so it is important for me to understand what reactions are taking place).

Gold Refining Purification Process

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. ... The fine gold looks just like used coffee grounds, and if you take it between your fingers, is crumbles just like coffee. Then I mix it with alcohol and borax and saltpetre ( potassium nitrate) all available at your ...

Borates in metallurgical applications

The gold and silver refining industry and assaying laboratories use Dehybor anhydrous borax as part of their flux formulations. The other ... Dehybor anhydrous borax, potassium borates and in some rare cases potassium fluoborates. Several company are also making welding rods where the flux is bound

Borates in Metallurgy and Gold Refinement | U.S.

Borates ensure neutral pH during the last stage of nickel recovery—electrolysis. The right borate level (in boric acid, boric oxide, or anhydrous borax form) enables greater pH control and proper …

Copper Nitrate Cell | Page 5 | Gold Refining & Metal …

Copper Nitrate Cell. Thread starter rusty; Start date Apr 18, 2011; Help Support Gold Refining Forum: ...

Gold Refining Methods

The bullion is melted in clay crucibles, and a little nitre (potassium nitrate) or sodium nitrate is thrown on to the surface of the metal. Violent bubbling at once ensues, …

melting in cupel | Gold Refining & Metal Extraction Forum

Will borax, soda ash, or potassium nitrate in molten form harm them much? Do they need to be seasoned (read babied) like melting dishes. The reason I ask and not just try and see what happens is that I have some melts to melt into a beads for a couple people that have been very patiently waiting on me to have some free time to get thier …

Borates in metallurgical applications

The gold and silver refining industry and assaying laboratories use Dehybor anhydrous borax as part of their flux formulations. The other ingredients in the flux formulation will …

Extracting gold using borax? Can someone explain? | Gold Refining

Then the excess mercury is burned off, I think the ratio of precious metal to mercury is something like 1/5. Then the mercury is burned off when the gold is melted. The borax was only used after the gold had been extracted. At best the borax was used to refine impurities, not extracting the gold.

Gold Smelting Method

You need to explain a bit more, the general fluxes used for smelting of gold concentrates are Borax (40-50%); Soda Ash (10-15%) and Sillica sand (5-10%) of your dry concentrate mass, this also vary on the type of oven and very much on your ore type or your concentrate, thus my figures are normaly used in gold mines with general impurities …

potassium nitrate | Gold Refining & Metal Extraction Forum

hi is potassium nitrate kn03 know as saltpeter :?: thanks. Forums. New posts Search forums. What's new. New posts Latest activity. Members. Registered members Current visitors. ... Help Support Gold Refining Forum: This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others. T. tintin …

Question about Potassium Nitrate solubilty in Nitric Acid | Gold …

Let say you add 150 grams of Potassium nitrate in 100mL of water at 35C. This is 50 grams more than the maximum solubility of KNO3. Now let say that you slowly add concentrated sulfuric acid to the solution. This will convert the Potassium Nitrate into Nitric acid and Potassium Sulfate.

Flux for Making a gold bar | Gold Refining & Metal …

What is commonly used is boric acid, or borax. Borax absorbs oxides, and boric acid, if I am not mistaken (I may be) reduces oxides, so they are returned to the parent metal. ... I believe that major gold refining company use this powder when making a fine 99.99 1kg bar. Reply. T. teabone ... and chemically called potassium nitrate. It works ...

Slagging iron and manganese from orecon | Gold Refining …

A good oxidizing flux I've used is; 1 part sodium carbonate 1 part anhydrous borax 2.5 parts potassium nitrate 1 part silica of course an intimate contact with the oxidizable metals is required, a pool of this flux at temperature will out gas without much effect on your charge. Air alone is a powerful oxidizer if you can get the molten metal ...

Help with smelting and fluxing.

Kurt is very right when he said potassium nitrate is hard on crucible's. Depending on the make up of the crucible, the life can be as short as one use. A while …

20 lb Sodium Nitrate Gold Refining Pyro 99+% Pure

Sodium Nitrate 99+% Purity MinimumWhite Pellets / PrilledSodium nitrate is the chemical compound with the formula NaNO3. This salt, also known as Chile saltpeter (to distinguish it from ordinary sa

Using Borax Flux to Refine Gold

Borax does more than clean clothes; it can also "clean" gold ore to produce samples of pure gold. Learn how borax-based refining works in this article.

Increase the Gold Purity

Please advice how can I increase the gold purity during smelting from sulphide ore, fluxes used are Borax (dehydrated), Silica, Soda ash and Potassium Nitrate. It is for smelting of EW sludge and I want to reduce the amount of silver and …

Black residue from nitric digest of silver | Gold Refining

Jsargent: Indeed!!!!!....silver sulfide melts without change so you will never see metalic silver.However, we have to learn how to deal with silver sulfide because it is the most important ore to produce metalic silver and all silver compounds can be converted to silver sulfide...Here are three tips from my experience: 1.- Melt the silver sulfide with …

Gold Smelting Method

Caustic soda in the molten pool, it form silicates with the silica transforming the base metals into oxide embedded in the slag as well the borax but the potassium nitrate also …

E-waste copper-lead alloy cupellation | Page 3 | Gold Refining …

I tested potassium nitrate with e-waste alloy couple times, almost I got same alloy weight each time, even iron and tin not oxidized, I started to add 10% KNO3 from alloy weight and reach up to 50% with no changes, no metals oxidized, I make sure about using oxidizing flame all the time, and stir the KNO3 mixed with borax and soda ash to absorb …

HCL Concentration | Gold Refining & Metal Extraction Forum

(White Quartz rock) CaF2 (calcium fluoride) (fluorite) (fluorspar) rock shop,pottery supply, mining supply BonAmi soap grocery Na2B4O7 (borax) (20 mule team soap) mining supply, grocery store (NH2)2CO urea fertilizer (this is better for grass than refining) SO2 (sulfur dioxide gas) welding supply or can be made NaCLO3 (sodium …

Borates in gold metallurgy

Dehybor® anhydrous borax is used in the gold refining industry as part of flux formulations to dissolve metal oxides, as well as being used as a ux in gold assaying.

Smelting Shaker Table Concentrates

End users can adjust the components to adapt this flux to their specific needs. Typically used for smelting, refining, and melting concentrates." It contains the following: 20% potassium nitrate, 8.75% soda ash, 62.5% borax, 8.75% silica. My thought was that I would need an oxidizer for the tellurium and bismuth.