Say you had an absolutely pristine new beaker, would it nucleate somewhere because of the disturbance caused by the gas or would it crash all at once like supercooled water does?
@@gabrielribeiro3166 microscopically there is no such thing as pristine glass, the nucleation sites would just start smaller and look more frost like. Or sometimes you get a weird concentration/cooling issue where the nucleation sites won’t appear and you have to add a seed crystal or something else to get it to crash out. Like those hot ice videos or the ones where they supercool water and then as it pours out it freezes. Changes in temp, pressure, movement, and a surface for the newly formed crystals to nucleate to are the main factors.
The gold precipitated by the gas had the same appearance as the one precipitated with oxalic acid in another video of yours. Thank you for more this refining class.
I have to say of the many times I've watched you do refining on gold the two times you've used the gas have been my favorite and both of the bars turned out immaculate. I know it takes extra steps but wow at the end product.
It's not a practical consideration but a visual one... I'd like to see this done with the pregnant solution and the ambient environment it's sitting in just containing SO2... Get it clear with bubbling first so it's right on the fence, then just have it trapped in a chamber... I'm thinking the gold would only want to form at the surface, and fall out as it aggregates and gets heavy enough to go down. Real gold rain lol
*So2 Gas precipitation not only yields purer Gold powder, but it is also more efficient in its precipitation reaction, thus, dropping more Gold out of solution 👍. That pure Gold bar is worth about $3945.53 USD. Not bad Mike 👍😃*
I asked you maybe someone else as well, but thank you for doing this procedure for us and like you said it is a remarkable outcome and very beautiful results. I especially like the part where it turns brown quickly and out of nowhere the 4 9's fine collects in the bottom with no rinses needed. Your the best Mr. Street Tips.
Hey Sreetips, just wanted to let you know how much I love your videos. When I took chemistry in high school, my teacher was verbally abusive and I didn’t learn anything. Your videos have shown me that science and chemistry is actually beautiful and interesting! I’ve even decided to take an entry level chemistry class my next semester at college because of you and your videos! Thank you, and wish me luck!
Dig the new setup, i.e. fume hood, light, etc. The SMB gas reaction is incredible. Amazing how whatever changes are happening to Gold makes the solution go clear then brown. Also the melts are beautiful when you are not using filters. That was one beautiful bar this go around.
It's really hard for a layman like me to wrap my head around that. You have a colored solution, miraculously goes clear (yet still has that much gold in solute) then goes brown and all in a flash. I have a hard enough time accepting it just changing colors like that, but the clear thing explodes my head. A few hundred years ago I would probably accuse him of witchcraft!
Questions: @8:00 If you would have used a magnetic stirrer, perhaps there would have formed larger gold crystals in the suspension (instead of a higher amount of Au-nanoparticles). But this is only an assumption. @18:10 Why do you redisolve the fine gold precipitate again in HNO3 and HCL (and why add again H2SO4 as you had used FeSO4 just minutes ago, and the SO4-- would have precipitated lead)? @22:00 Instead of a SO2-bubbler you could perhaps use directly "Sulfurous Acid" (H2SO3), which is sold for around 65 USD per 2.5l. Thank you very much for your video! I always enjoy watching them till the end!
I’ve used stirring and the stir bar gets crusted with gold. I add H2SO4 every time I dissolve (unless I forget). It hurts nothing, provides a big benefit, and costs almost nothing. Learned from a professional refiner on the goldrefiningforum.com Harold_V
I dont know anything about any of the things you are doing but it is super interesting to follow along and listen to you narrate the steps. Thanks for these informational videos!
A thought crossed my mind. If you allow your gold to sit and dwell in hcl, and hit it with an ultrasonic cleaner, would you be able to use far less hcl to was the gold?
Very nice lighting since the new fume hood got installed! Saw the shorts about it, and was looking forward to the next refining video. Have you ever considered setting up a backlight when you do a precipitation? Maybe shining some extra light from the back gives the murky solutions some sparkling or glittering effect to it? Just an idea, idk how well it would work since precipetated gold doesn't really have a golden shimmering to it. Thank you very much!
Cheap strip lights from Amazon you can adjust the color temperature and the brightness and all different colors have a red and green Christmas special orange and purple Halloween red white and blue Fourth of July
But I’m not extracting with a solvent. I’m rinsing a solid (gold sponge) free of ferrous sulfate. So I could use water as the solvent, put gold in the cellulose thimble filter, turn on the heat, and let it go indefinitely.
You are welcome. To see colourless, transparent gold in solution is astonishing. On a slightly different note, I watched a Commodity Culture upload on palladium the other day which included a clip from one of your uploads showing a well used silver cell anode basket filter with a reference to slimes created during the refining process. To me it seems as though proper credit was given and was used in good taste. Thank you Sir, for your knowledgeable, fascinating, engaging and entertaining content.
The fumes consist entirely of nitrous oxide; it is possibly that some gold-bearing solution may splash up during the boil, but you'll note that sreetips washes down the sides of the beaker before each transfer operation to recapture anything that may have splashed.
I use a clear glass saucer to cover the reaction. I do notice that a small amount of gold bearing solution tends to condense on the saucer. I do believe that a trace of gold may depart the beaker with the fumes during the dissolve. My opinion.
@@sreetips that isn’t gold solution that’s condensing on your watch glass. It’s ‘fuming nitric acid.’ N2O5 that has supersaturated a bit of water. It’s red from the NOx fumes, not from any gold.
@@B-System Nitrous oxide is colorless and mostly odorless. Those fumes are nitrogen oxides that include a small amount of N2O, but mostly nitrogen dioxide NO2, N2O4, N2O5. They’re just called NOx to include all those different N compounds.
Very interesting. I have done crude refining of Gold with Aqua Regia and Copper. An uncle who worked at the mint in Ottawa gave me a tour of the place. The highlight of the tour was melting 999 Gold in a large crucible and pouring an ingot. They threw Carbon granules on top of the Gold while it was still glowing.. I often wondered why. They had Gold stacked like cordwood in the basement. He told me I could take any Gold I could get out of the building with, but I declined the offer.
Wow,you made gold dissappear i never thought i would see that. Science never fails to amaze me. Who came up with this and how many fails would they have to go through? Looks like i got some homework. Thanks i really enjoyed this video.
This was great! Educational as always. I learned that Ferrous Sulfate (Iron) looks just like gold in solution. That explains how I am being tricked into thinking there might be gold.
Gg! We use fresnel lenses and solar panels to do our gold refinements. This helps save a lot of money on propane/torch costs however we do this a lot breaking down old electronics circuit boards etc. Keep up the good work!
Some people think it is magic. I've had one or two who thought the crystals from the silver cell were just grown over and over without buying and running new silver through the process.
Honestly not gonna lie, that is how you should do it every time. That’s the coolest piece of chemical reaction eye candy ever. Tho I was a bit disappointed you forgot to test it before you dropped it on the gas drop, but the reaction made up for it.
The best description of the reaction... I was literally excited watching... My husband said "Your the only woman I Kno that tells at a chemical reaction video as if watching football!!¿" 🤣😂🤣 Guilty as charged!! ✌🏼😊💗🧪👩🔬
@@sreetips Still cool to watch. I showed my wife and son as well. Everytime I watch your videos I try to figure out what the actual chemical reactions are that are taking place. Its interesting to watch, and neat to see the process on how its done. I'd do it if I had the patience you have, but I don't...
And ive always loved the sound of the quench when there is a delay between the sound of it quenching and the exact moment it hits the water. You can here it hit the pan before even hearing it sizzle and quench to a finish. 👍👍
With you're always being so meticulously careful not to have any ferrous metals in your equations I'm curious as to why you chose to use ferrous sulfate to precipitate the gold? Is that form different somehow or behave differently, or why is it that you would use it in this case but avoid it like the plague any other time?
It’s very selective, brings down only the gold. A second refining afterwards got rid of any residue iron. To provide some variety for my channel to peak interest.
My actual job is regarding precious metal extraction from E-waste using only environmentally friendly methods. My recommendation is to look towards aprotic conditions, the reduction potentials become much more favourable
Is there any safe surfactant that could be added to lower the surface tension of the solution to help those flakes drop? Safe meaning not rendering your waste solution useless.
@@sreetips Gold panners use jet dry as a surfactant to keep tiny flakes from floating away. Would definitely help with these larger flakes, assuming it wouldn't harm the solution. Just a thought.
with the amount of gold you poured off you will need to do a temp waste pot clean up next. would have been a big boost to the total. gives you another video to do tho :)
...one of the best reactions ive ever seen!!!!!!! amazing!!!!!!! ...I wonder what would happen if you stopped the gas flow at the colorless point? noone would ever believe it was a clear water like fluid filled with gold!!!! 🤑🤑🤑🤑
I did just that in the next video I published. After removing the gas delivery tube, it did just as I predicted, it continued to turn brown from clear, even with no gas flow.
Beautifully done! Great video. You suggested I might do a channel on copper work, and after looking into it, I really appreciate the amount of work and care you have to put into every video. So now with a little better understanding, WOW, Thank you for all the work, and great content!
OMG ,,,,, that looks BEAUTIFUL , , and i am very interested in this new method , i also noticed u are NO LONGER caring if its a dry powder anymore , and the 3 torch system , very cool
well BECAUSE OF YOU , i am fixing to do my first batch of gold , i have tore apart 12 desk tops and 11 lap tops , , i have bought everything i think i need to do all of this i know i need a few other chemical's , i know i need the stuff to test for gold in the solutions , if i calculated it right i am looking at about 3 ounces ,
Ferrous sulfate can be storage as green cristal, here's how In a big beaker of approximately 4000 ml put pieces of iron steel like big nails iron wire etc .then add water about 3Liters and add sulfuric acid and keep hot for about 8 hours adding sulfuric until the water is dark green gray, let it Kool and filter while is warm ,put in containers into the fridge and next day you will have nice cristal that you can rinse ,dried, and storage 👌
When he says "I'm going to add some hydrochloric acid here to turn it green" - that bottle is clearly marked Muriatic acid. Which is great for etching glass. Pretty powerful stuff, but not Hydrochloric. No matter, very much enjoyed this!
Take the different solutions, especially the gold nitrate, and soak paper towel with it. Dry it with a fan so crispy dry, then ignite it in the fume hood. It will likely leave behind pure gold metal effectively skipping the final steps. Try it
SO2 is always awesome to watch! What had me wondering was why your first batch was so dark? It cleared up pretty well after it filtered but it was so dark I was wondering if it wasn't loaded with pgms? Dropping it with ferrous sulfate would have eliminated the pgms, and would explain the massive amount of rinsing! Great processing, gorgeous bar!
The karat gold I started with had much white gold so PGMs was a good possibility. Part of the reason I chose copperas. I didn’t mention this in the video but I should have for clarity.
You are extremely thorough. I'm actually surprised you don't distill the distilled water before you use it! Haha! Seriously, love the video's. It's satisfying how you make sure to rinse and re-rinse everything..
Man, it's so amazing to see such a clear, colorless solution knowing how much gold is suspended within it. I definitely watched that part about 4 times lol🤦
16:00 At this stage, you could transport it without anyone ever knowing it's gold. :D 34:00 You could put that in a mustard jar and stick it in the back of a cabinet. No robber would ever bother with it. Just make sure your mustard jar has like a year past expiration date on it.
Sir do 1 video in which u refine Platinum Palladium n Rhodium from same sample.... Bcs regarding Rhodium refining i found only couple videos on youtube which nt proper.... In 1 video wen Rhodium was precipitating it turned into mesmerising purplish blue color
@@sreetips thanks so much sir for the reply.... Love ur dedication towards the knowledge shairing.... Best part of ur videos r even wen u get stuck in unfavourable conditions u nt give up u go through it n finish ur task due to ur decipline n dedication.... Keep up ur good work
@@sreetips no you aren’t. You’re doing fine. That bit of black residue you get after your aqua Regis digestion is your Rh. You need to remember, people Plate their gold with Rh to get that ‘white gold’ look. It’s only going to be a flash electroplate of several millionths thick. You handle so much jewelry, it’s bound to be there. That where you’d be picking up any Re or even Ru, although both are unlikely. If you simply collected all those black residues into a Pb dore bead and cupelled the Pb away, you’d be left with a bead that’d include the Rh into one place. I know you don’t want any Pb anywhere near your process, but if you did a collaboration with somebody like Martin Bros Mining, he does cupellation all the time. For him, it’s be a tiny run. It’d be interesting content for both of you. Just carefully ash your bucket of papers, take your dead end PGM work up material, stir the ash into a 30g PbO charge, add sufficient sand, lye and borax, and then do a melt. Cupel the resulting lead slug. Bingo. PGM dore bead. Might actually be pretty large…
Beautiful gold bar :) In my opinion you would have a slightly higher yield, if during the rincing process you would add a tiny quantity of surfactant (basically a couple of drops of detergent) to your rince water and thus deminish the surface tension of the liquid, dropping more of the gold powder and flakes to the bottom of the flask. Just a suggestion of course, but worth a try... after all, after three or four rinces with pure water the soap will be washed away anyhow
Magic! Pure magic. I had to watch this one again. I think this process with the gas is less caustic waist also. The flash over to gold and mud was impressive! Just WOW.
From being a regular watcher & enjoyer of your efforts. Seems like this video's process is how you should be dong all of the refinings for best purity. sukss that it takes so much to rinse color off from the copperass but, since it only drops the gold & less chemical waste from gas precip, that bar of gold looked AWESOME. I enjoy your efforts Sreetips & ty for taking us along
That's absolutely amazing to see the changes in the solution seems pretty efficient way for you to refine your gold not too many steps and not too many minutes spent 👍☺️
One of the things you have to watch out for is that stannous chloride will turn black in the presence of gold *salts* but will do nothing in the presence of gold *particles*. If you have small enough gold particles (smaller than a micron), they'll stay in a colloidal solution and you'll just lose them. They won't show up on a stannous chloride test. If you have a known quantity of gold and you're not getting a stoichiometric yield, that might be why. It depends a lot on the conditions of the precipitation as to the size of particles you'll produce and how much they'll aggregate.
