Gold Powder from HCl-Cl + SMB

The gold was dried as per Harolds instructions. After washing the gold powder with three rinses of clean water I gently heated the gold powder in the same beaker it was dropped in until all the moisture was gone. I swirled the gold as it dried to keep it from sticking to the beaker. I only filter solutions of auric chloride now.

Excess smb in AR

SMB is added at a 1 to 1 ratio as expected gold by weight. If you expect 100 grams of gold, add 100 grams of SMB. SMB will when added to HCl regardless of anything else. The SMB is destroyed when added to the acidic solution. It decomposes into SO2 gas and sulfuric acid in solution. The SO2 is the gas that reduces the gold to metal.

Copperas or SMB | Gold Refining & Metal Extraction Forum

I leached some smelted material in nitric acid. After dissolving the left over solids in AR I tried to precipitate with SMB. A thick white cloud formed. I waited for the gold to drop and redissolved the gold thinking the white precipitate would stay put. The precipitate redissolved with the gold. I tried SMB again and got the same white ...

Precipitation: SMB vs NaOH | Gold Refining & Metal Extraction …

Nitric acid dissolves everything except the gold plating, tin transforms into an insoluble Sn (OH) 4. Instead of aqua regia, I used a mixture of HNO3 + NaClO. Gold is dissolved in this mixture, Sn (OH) 4 remains in the sediment. The solution became yellow. In the case of SMB solution remained yellow, precipitate was brown, but then became ...

smb clarafication and process refinement please..... | Gold …

Gold Mining & Metal Detecting. Prospecting, Mining, Ore & Geochemical ... then dropping the Gold with smb. The fingers also need to be heated in Hcl again after removal from the fingers after rinsing to remove stubborn traces of base metals that will contaminate your final Gold drop. Even then its best to drop the Gold 2 times with rinses ...

TOO MUCH SMB

Take into account that 1 ppm gold in solution has 1 milligram of gold per litre and you see that the amounts of gold losses are small but still present. This effect is caused purely by divalent metals acting as oxidisers and is a separate effect to having nitric present even though the result in terms of gold losses is similar.

Refining Karat Gold and Silver Jewelry using …

Without getting too much into the chemistry, when adding SMB (powder) to neutral/acidic solutions it releases SO2 gas that in turn dissolves in the solution and reacts with the dissolved gold and perform the actual precipitation of the …

AuSn 80/20 alloy

Gold do not dissolve into HCl, Tin(Sn) do. The mud will be the gold. If you suspect more Tin is left. Dissolve the powder in HCl Peroxide or HCl Bleach. Do NOT use AR, because Tin and Nitric makes metastannic acid. After dissolving, precipitate with SMB, wash and melt.

SMB drop....help? | Gold Refining & Metal Extraction Forum

By skipping the base metal extraction stage (i.e: AP recovery), you have induced your symptoms. ... Remember " SMB " Is Not a Gold specific precipitant. So it is not the Be all and end all for Gold recovery. Remember Inoganic Chemistry is an exact science so work carefully.

Gold Extraction Methods From Three Types of Ore

The methods of extracting gold from quartz vein ore, sulfide ore, polymetallic gold-bearing ore, gravity separation, flotation, and cyanidation can all achieve high recovery rates.

Experiment precipitating gold out of solution 3 ways

This weekend I tried an experiment with precipitating gold in a couple different ways. I have easy access to SMB, but was looking for a second way to more selectivity isolate the gold and get better purity. So, in my searching I found a couple different methods. I think the obvious one that...

Gold Precipitation Methods

How much SMB

It's been mentioned quite often, about 1:1 ratio gold:SMB. But you need to remove all nitric acid from the AR (aqua regia) before dropping the gold. ... Knowing what is in there is the starting point to determine the best way of extraction. And thus the cheapest way. Acid leaching of ores is not recommended often here, mostly discouraged for a ...

Solution turning blue after SMB

Finally I Washed the rest and took the gold with a final AR. But since I assumed that it did dissolve some amount of gold, I looked to see if there was any gold loss in the water where I cleared the base metals. Whenever I added SMB, it turned into a deep ink color as you can see .. Then when I checked it with Tin, I saw what was in that small cup.

i don't know if i need to add more smb | Gold Refining

i have about 2.5kg of gold dust from polishing machine the gold is 18k i dissolve the gold with aqua regia immediately and add SMB for recover the gold i get the gold back but i don't now how much i need to add more SMB because when i tried stannous test i still get a postive indcation of gold in solution my question how i can get the right amount of smb to add and if i …

Precipitation of Gold using SMB

Hi, I am new to this & I've tried to precipitated the gold using SMB, Unfortunately yield is very low. I had 7g of pure gold scraps, before melting with Aqua Regia. How ever after gold precipitation using SMB, weight of gold dust is less than 1 g. If any one can explain, What had went wrong...

Sodium Metabisulfite

Hi, I am new here and have read already alot to refine gold and silver. On one topic I've read to use SMB to precipitate gold. But how much SMB in how much H2O do I need to precipitate the gold in a solution of 0.53 gallon (1,6+0,4=2 Liters) …

Gold Precipitation

sodium nitrate does not precipitate gold. SMB (sodium metabisulfite) is the preferred precipitant for gold on the forum. ... 4 Pieces IC Chip Remover Tool IC PLCC Chip Extraction Tool Extractor Puller 4-Claw Prongs Grabber and Keyboard Key Switch Test Pencil Tool for Disassembly of Electronic Component Jewelry Deladidea. $19.75 ($19.75 / Count)

SMB or Baking Soda???

The idea behind using SMB is to selectivly precipitate gold. The SO2 created by SMB is what does this. While sodium bicarbonate will precipitate gold out of solution, it will precipitate everything else as well and put you right back at your starting point. Oh, and it is "baking soda", just so you know

How much SMB should I add?

A day after, I filtered the Aqua Regia and added around 20g of smb. I added 20g of smb because all the videos I referred to added a few spoonful of smb during their gold recovery processes. After further researching about the amount of smb I should add, I found out that in order to recovery 2g of gold out of it, I should only add 1g of smb.

Too much SMB

the SMB is dissolved in water and then decomposes into SO2 and salt. if you warm the solution, the SO2 (which is a gas) will escape the solution faster. it will evaporate on its own, but may take some time. by heating, it will drive the gas from the solution. bring it to a slow gentle boil for 15 minutes or so and then allow it to cool.

Using ferrous sulfate vs SMB as a precipitant details?

Hello, the prefered method for dropping gold out of solution is SMB, CM Hoke talks about using ferrous sulfate and it will work great to. To expell the HNO3 (nitric) from your solution, you should use a methord called denoxing, by evapotating (DO NOT BOIL) the solution down …

Problems with SMB | Gold Refining & Metal Extraction …

Iam also having problems with dropping my gold with SMB (Bonide stump remover). Fine black powder and very little of it after 6 tablespoons of SMB. I removed foils and small bits of gold plate from fingers, memory boards, and cpu's using AP works great (but lots of trash from boards (green) ….washed cleaned with water,

stanous says gold is present but smb not dropping it.

That early batch of SMB was lumpy, just as LazerSteve warns about. Since I've got the new SMB all is good. I still think I get more complete drops with copperas. With SMB, even if I leave it in contact with the dropped gold overnight, when I wash the gold powder with HCl to clean it, I end up with gold in the HCl wash, which I have to drop again.

Help with precipitating using SMB | Gold Refining & Metal Extraction …

sounds like you still have free nitric in your solution. test it with stannous chloride to be sure the gold is still in solution. if you get a positive test, filter the solution and remover the excess salt. if you have a piece of gold, you can use that to rid the solution of the nitric. place it in the solution and heat it. you should get a reaction as soon as the solution heats up. if you ...

Problems with SMB Drop | Gold Refining

SMB is soluble in water. use hot water, actually, boil the powder in water until the salts are dissolved. as the solution heats, you should stir often because powder will cause the glass to heat unevenly and when you do stir …

Gold Extraction & Recovery Processes

This process recovers fine particles of free gold, gold associated in any form with sulphides, and native gold present in polymetallic deposits with certain degree of oxidation. For many years, a combination of amalgamation, …

inorganic chemistry

When I type youtube gold recovery from chloroauric acid into Google, the first link is to a Youtube video with a visible demonstration of converting chloroauric acid to gold. The video shows that metabisulfite can reduce chloroaurate to form tiny tiny grains of gold powder, as a reddish dust. A chemical reaction for this might be:

precipitation using SMB

The black/brown could be some of your gold. In a dirty solution that is the way the gold precipitates. I would try to sink the floating gold, decant the liquid(do not dispose yet) and redissolve with HCl/Cl (Hydrochloric/bleach). Let the solution set overnight to let the chlorine leave and drop again with SMB. Let us know how it goes.

Best way to use sodium Metabisulfite

I never check pH when using SMB. Steve . Reply. G. Gold Lady Member. Joined Dec 9, 2009 Messages 14. Dec 13, 2009 #3 ... pyrite gold extraction. Latest: goldshark; 20 minutes ago; General Gold Refining Discussion. B. gold buyer need urgent. Latest: Barstool miner; 29 minutes ago; Rogues Gallery.

PGMs precipitation

From mixed HCl-solutions with gold, thus only gold usually is precipitated with SMB and/or related reagents. In order to precipitate Pt as ammonium-hexachloroplatinate(IV) after precipitation of gold, it may be necessary to reoxidize eventually formed Pt(II) to Pt(IV). ... pyrite gold extraction. Latest: solarsmith; 1 minute ago; General Gold ...

what is smb in gold extraction

Gold extraction. Gold extraction is the extraction of gold from dilute ores using a combination of chemical processes. Gold mining produces about 3600 tons annually, and another 300 tons is produced from recycling. Since the 20th century, gold has been principally extracted in a cyanide process by leaching the ore with cyanide solution.

To precipitate AP with SMB or not

My issue is i have some used AP see picture so iv read and seen people say to add SMB and percipitate gold iv also seen others say to add copper buss bar to solution drop the precious metals . ... The Extraction and Refining of Metals (Materials Science & Technology Book 2) Amazon Services LLC-20%.

Gold will not drop with SMB or Sulfamic Acid

The Extraction and Refining of Metals (Materials Science & Technology Book 2) Amazon Services ... I then added sulfamic acid and heated, then a bit more SMB - No gold drop. Attachments. GOLD.JPG. 1.4 Reply. 4metals Moderator. Staff member. Supporting Member. Moderator. Joined Apr 5, 2009 Messages 7,390 Location northeast USA. Jul 21 ...

Problem dropping metals / gold from Aqua Regia with SMB

Orion Motor Tech Impact Nut and Bolt Extraction Tool Set, ... You really should do a stannous test before adding the SMB to verify gold in solution. And again after to verify that it all precipitated. By the time you read this your gold should have been long settled. But the answer to your question is yes.

How does SMB work?

General rule of thumb is to use as much SMB as you are expecting gold, if you add SMB and get no brown gas, then add what you expect to get in Au, then test after precipitation …