How to Refine Gold
It involves using a chloroauric acid solution as an electrolyte with gold placed at the anode and a pure gold cathode. In this setup, an electric current is passed through the …
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Yet another Sodium Bisulfite question | Gold Refining
General Gold Refining Discussion . Yet another Sodium Bisulfite question. Thread starter jsargent; Start date Oct 31, 2008; Help Support Gold Refining Forum: ... Yet another Sodium Bisulfite question. Thread starter jsargent; Start date Oct 31, 2008; Help Support Gold Refining Forum: ...
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Sodium bisulfite | Page 2 | Gold Refining & Metal …
OK sodium bisulfate wont work at all (understood).The stupm out I will look for.Only sodium metabisulfite works (understood).I am sure I wouldnt be able to get hydrasine I herard thats the best.I have oxalic for the last precip if I choose to use it.I still might just give up 30% of the yeild...
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Using Sodium Meta Bisulfite
This is a mini tutorial showing the action of sodium meta bisulfite on Auric Chloride ( dissolved gold). The auric chloride used in this video was from my other posts on inquarting. The brown powder was dissolved into HCl-Cl as a final purification step. It took 5 washes of HCl-Cl to dissolve the approximately 11 grams of brown powder.
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Is this Precipitating? | Gold Refining & Metal Extraction …
Next, slowly add a solution of sodium bisulfite (sodium metabisulfite in water) to the HCL/gold/urea mixture. When you start to smell sulfur dioxide being released, that is a good indication that all of the gold is reduced. ... Okay, I've read just about everything I can on Gold refining through chem pocesses. Got a pretty good idea of the ...
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Gold Hydrometallurgy – Refining to High Purity
The sodium bisulfite (1.8 g NaHSO3 per gram Au) or sulfurous acid (2.5 g H2SO3 per gram Au) was added to the solution in one increment. ... Refining of Precipitated Gold. Separate charges of gold precipitated by (COOH)2 or by SO2 gas were mixed with nitre (KNO3), silica (SiO2), and borax (Na2 B4 O7) and heated in clay …
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Dropping Gold using Stump Out (sodium metabisulfite) | Gold Refining …
Here is a short video I produced to demonstrate the technique I use to drop gold using Stump Out purchased from Home Depot (about $6 per pound). I have gottten good results so far using this process. Please give comments or suggestions if you see anything improper. If dropping gold using this method will hinder the recovery of other …
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How to Refine Gold: 2 Major Techniques of Gold …
Treat the solution of gold + other metals with a reducing agent (sodium metabisulfite) and filter. III. You will obtain pure gold powder, separated from the solution of other metals. …
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Where to get Sodium MetaBisulfite from? | Gold Refining
I get potassium metabisulfite from the grocery store in the winemaking section. Works the same as sodium metabisulfite. Its labeled as potassium metabisulfite, with no other ingredients, but I don't know if its pure.
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Sodium Metabisulfite | Gold Refining & Metal Extraction …
Decatur,Ala. Jul 15, 2012. #2. it depends on the amount of gold in solution. estimate how much weight in gold you have and add 1.5 times the weight of SMB in a clean container and add enough water to dissolve it all. add the SMB and water to your solution and stir. D.
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SO2 Sulfur Dioxide Gas Generator
Pacific NW. Jan 30, 2013. #2. Here are a few ways to generate sulfur dioxide gas: You can just burn sulfur (without air) to make sulfur dioxide gas SO2; a generator could be made from pluming pipe, or some other metal container. S8 +8O2 -->8SO2 (g) High heating sodium metabisulfite (sulfur is cheaper) Na2S2O5 --HEAT --> Na2O + 2SO2 (g) …
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Sodium Bisulphate | Gold Refining & Metal Extraction Forum
Solutions of sodium bisulfate are acid, with a 1M solution having pH of 1.4. In some applications, such solutions can be used instead of sulfuric acid solution. For example, from a solution of sodium bisulfate and sodium acetate it is possible to distill acetic acid. Sodium bisulfate solutions will also liberate CO2 from most carbonates.
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Do-It-Yourself Precious Metal Refining | Shor International
Gold Refining with Nitric-acid-based Aqua Regia 1-2 hours per batch e-scrap, jewelry, black sands, jewelers sweeps very highly corrosive simple setup costs can be as low as $100, depending upon capacity and sophisitication about $1-$2 per ounce to operate silver content can slow the process significantly; Gold Refining with SubZero-based Aqua Regia
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Unable to precipitate gold
Yes, you can filter the crystals, rinse them with some water. Then you proceed with sulfite. As Stibnut mentioned, it is relatively up to you which form of sulfite you use. You can use sodium metabisulfite (SMB), sodium sulfite or sodium bisulfite. Sulfur dioxide gas will also work perfectly.
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Potassium Metabisulfate instead of SMB? | Gold Refining …
Jan 11, 2008. #2. Sodium metaBISULFITE, not sulfate. Only the sulfites will generate SO2, which is what precipitates the Gold. It shouldn't make much difference if it is the Potassium or Sodium salt, because it's the Sulfite that does the work. The Sodium or Potassium ions are just spectator ions and don't take part in the reaction.
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Sulfurdioxide, sodium sulfite, sodium-meta-bisulfite
Sodium thiosulfate, can be made boiling sodium sulfite Na2SO3 and sulfur together, Na2S2O3 sodium thiosulfate is used in photography to dissolve unreacted silver halide from film. Sodium thiosulfate is also used to leach gold and silver from ores. Usually as ammonium thiosulfate and copper sulfate basic PH.
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sodium percip | Gold Refining & Metal Extraction Forum
dose sodium bisulfite in the pool section work for percipatating gold,or dose it have to be sodium metabisulfate? Forums. New posts Search forums. What's new. ... Help Support Gold Refining Forum: This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others. cloomis Well-known member. Joined …
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Gold Hydrometallurgy – Refining to High Purity
High-purity gold was precipitated from the aqua regia solution with oxalic acid, sulfurous acid, sodium bisulfite, and gaseous sulfur dioxide. The leaching-precipitation …
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Please some advice for proper pH before precipitation | Gold Refining …
Very true. For years, almost daily, I used hydrazine sulfate to drop the gold from a so-called "reverse AR" solution - 50% HNO3, 3-5% HCl, remainder tap water - @ room temp. Dropped all the gold, with no HNO3 treatment required, with very little Hydrazine sulfate. Hydrazine hydrate would have worked as well.
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molten sodium bisulfate | Gold Refining & Metal …
56. Oct 1, 2011. #1. The residue left over from leaching the original mineral concentrate contains rhodium, iridium, ruthenium, and osmium. This is treated with molten sodium bisulfate to convert the rhodium to rhodium sulfate. The rhodium is then solubilized by water leaching, separated from the insolubles, and precipitated from solution by ...
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Sulfurdioxide, sodium sulfite, sodium-meta-bisulfite | Gold Refining
Sulfurdioxide, SO2, is a toxic irritant gas, fairly well soluble in water, giving an aqueous solution of sulfurous acid, H2SO3: SO2 + H2O => H2SO3. The acid is stable only in diluted aqueous solution and decomposes easily back into it's constituents, SO2 and water. It has two reactive protons...
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sodium metabisulfate | Gold Refining & Metal Extraction …
Nov 2, 2011. #6. Sulfite SO3. Sulfate SO4. Both contain sulfur and oxygen, the ending number gives the oxygen, one will make SO2 gas in water the other will not, the SO2gas what precipitates the gold from solution. Sulfates can be used like sulfuric acid is. Na2S2O5 sodium metabisulfite, some other names or similar chemical.
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Best way to use sodium Metabisulfite
Here's the 3 and their differences. (1) subsilver2. The original. This is, by far, the most complete. On each individual post, there are direct buttons to PM the author of the post and to see his Profile. Click search and you're automatically in Advanced search. The only problem is that there's no Kitco. (2) prosilver.
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What is exactly chemical process and why gold drops?
The equation for the SO2 gas with Gold III Chloride is : 3SO2 + 2AuCl3 + 3H2O = 3SO3 + 6HCl + 2Au This reaction only occurs as a step in the overall process or if you combined sulfites with water or acid: Sodium Sulfite with water to Sodium Bisulfite: Na2SO3 + H2O = 2NaHSO3 Sodium Bisulfite with AuCl3 to Sodium Bisulfate: …
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Metabisulfite | Gold Refining & Metal Extraction Forum
If liquid is yellow, and gold in solution (stannous chloride test), try sodium bi sulfite, should smell SO2 gas (rotten eggs), liquid may turn brown, and gold will make brown salt let settle, remove liquid without moving powder. If all everything fails, and gold is in acid water, use piece of copper to cement replace gold, brush off copper, let ...
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Gold Precipitation | Gold Refining & Metal Extraction Forum
I have used sodium bisulfite and sodium metabisulfite, and they work well, copperas (ferrous sulfate) also works well. Geo, note, he asked about sodium nitrite NaNO2, not sodium nitrate NaNO3. Hoke also mentioned the use of sodium nitrite to precipitate gold from aqua regia. I agree study Hokes book, it is your key to …
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Sodium Bisulfate vs Sodium Bisulfite
Several of the metal chloride will react in a similar manner. NaCl + H2SO4 --> NaHSO4 + HCl. Now to the question, sodium bisulfate will not precipitate gold from solution. We can use sodium sulfite Na2SO3 to precipitate gold from a gold chloride …
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Pic of sodium sulfite precipitant
Gold Refining Basics. Gold Refining Gallery . Pic of sodium sulfite precipitant. Thread starter jsargent; Start date Nov 4, 2008; Help Support Gold Refining Forum: ... Thanks for your feedback Lou! I didn't realize sodium bisulfite was no more selective than other precipitants for gold. I have read many sources singing the praises …
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Tuneable separation of gold by selective …
Reduction of this solution by sodium metabisulfite yields metallic gold of 97.04% purity (Supplementary Table 4).
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precipitating with sodium sulfite
Either SMB or Sodium Sulfite, or even sulfur dioxide gas will work fine for reducing gold in HCl-Cl solutions. When highly concentrated the solution will lean towards deep orange to deep red when highly concentrated. I use dry SMB exclusively now days and never have had to heat the solution to get the gold to drop.
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