A few comments on the gas + liquid methods, if I may be so bold: 1) Chlorine gas is quite heavy and loves to dissolve into HCL, so you don't really need a bubbler below the surface of the liquid at all, eliminating the backflow risk so you don't have to watch it like a hawk. I use a 5L flask with 500ml of HCL + Gold and fill the extra 4.5L deadspace with Cl gas and let it stir until all the gas absorbs into the liquid to replace the Cl used up eating the Gold and repeat as needed. Less Cl floating off into the hood makes those ventilation fans and ducts last a whole lot longer as a bonus. 2) You can drip your HCL into plain old laundry bleach to get the Cl. Less gas overall, but cheap as dirt and you can live with less using the above method. 3) Once you have your final gold solution, you can heat it up to drive off all the Cl, it'll all be gone well before the boiling point so the first boiling lets you know it's done. This'll speed up your later precipitation and skip any risk your stannis test might be fooled. Same is true for the SO2. You can warm up the waste solution after your precip to toss out the SO2 in your fume hood and make the stock pot loads less stinky later on. 4) You can drop plain old HCL onto your SMB to get SO2 gas. The only little issue is that the reaction is endothermic so your flask can turn into an ice cube if your precip takes too long. 5) Love your work. This channel sent me down the grocery/hardware store path back in the day when this info was much harder to come by and everyone else was showing the expensive way. Big thanks!
Thanks for confirming point 4 about the HCL with SMB. Sulfuric acid is not easy to get and expensive for me so it’s good to know there is a cheap and easy alternative.
I did the chlorine bubbling with a pear-flask and a long stem tube adapter with vacuum port. I let the vacuum port pass through a neutralizing bath in case any gas passed through the gold solution instead of just venting it outside. By cutting the long stem to the appropriate length I got a very nice agitation with no stir-bar and the gas had maximum time to be absorbed in solution. During the settling it worked well too.
Hey sreetips I keep hearing you say on your videos you're not a chemist. As far as I'm concerned you're absolutely an industrial inorganic chemist no matter whether you've been to university or not. You follow the scientific method every single time... hypothesis, experiment, draw a conclusion, then refine your hypothesis and so on until you've perfected the method. Better than plenty of 'chemists' I've worked with! Well done! Your video skills behind and in front of the camera improve all the time too. You're a really personable, humble guy and very likeable. From this pro-media guy, you've got something really special going on here. Love it!!
Been watching you for years. Always a joy to watch you work. It's been great seeing your technique improve and grow, and to see your lab and methods become more refined. It's amazing!
Yay another great video! Thanks so much Sreetips. As a Geochemist I completely geek out on this stuff. Even after 30+ years I still love my job and I love the science.
There is just something about this channel that I just love. Not sure if it’s sreetips sultry southern voice or the chemistry of it all but gosh dang am glad he’s gettin up there in subs.
Wow that might be the purest gold powder ever made by a single refining. Typically it would take multiple refines or the electrolysis process to get the gold that fine. I’d say that’s .999+ all day long especially since there were actually gold crystals in the mix. Awesome work and beautiful to watch.
Probably because I’m the only refiner you see. Most wouldn’t be caught dead revealing their secrets on social media. Makes me a bit of an outcast amount the refining community.
Set up your dripper for that H2O2.....great video, you are perfecting everything in front of you from the gold to the silver cell....awesome to watch brother!
you should try to increase the surface area of the gold to get it to dissolve quicker. If you pour the molten gold onto a fast spinning cold metal cylinder you can get a thin foil ribbon.
Absolutely wonderful I like the different processes that you approached it with and hitting it with a bright light at the end of the run to illustrate what a color change that was was fantastic
To improve dissolution, you can use a dispersion tube (gas inlet tube with sintered glass ending) - dispersing requires more positive pressure so a check valve is a good safety measurement. Cooling the solution helps dissolving the gas.
Good luck in your endeavor. Start w small batches and practice every step, rewatch all of Screetips videos. Quality equipment will make a difference too. 👍
Try keeping the temp of the solution below boiling (160-170F) when using hydrogen peroxide to dissolve metals. It helps reduce the bubbling a lot. A large amount of the bubbling is from the high temperatures breaking down the peroxide into oxygen gas and water. Thus wasting peroxide and slowing down the operation.
SMB dissolves far better in harmless cheap glycerin. In my opinion you would need far less of that sort of solution than spooning in SMB by the truckload into your aural solution :) It's also reputed to be a good rust-stain remover. Great video and, by the way, that sudden flashover from aural solution to gold powder is fascinating to watch... Well done mr Sreetips
Will you be going with the bubbler method for further refinements? A) it seemed to be easier in a sense, quicker, had an insanely beautiful outcome, and possibly much cheaper to refine. B )It was a thrill to watch as a viewer :)
Dissolving gold with Chlorine Gas is most efficient when the raw material is in powder form, as large surface area is necessary for the gas to attack. Precipitated gold or anode slimes are perfect materials for this process; so are ball milled ore too. Lumps of gold or plated connectors, use fx. AR (Aqua Regia). Printed Circuit Boards or mobile phone boards, use fx. Cyanide. The majority of commercial refiners use this Chlorine process for both gold and the "six sisters" Pt, Pd, Rh, Ru, Ir, Os (the latter three usually requires an additional step) with an impressive extraction rate of 99.5%. An improved process is gaining ground among commercial refiners: Using a blend of 50% Chlorine Gas and 50% HCl gas (which is not HCl acid, but a mix of Hydrogen and Chlorine gas) results in an incredible recovery rate of >99.9%. The best way to carry out the Chlorine process is to heat the HCl acid between 60 C to 105 C. Most common carefully controlling the temperature at exactly 95 C as a precaution in case Ruthenium is, or may be, present in the raw material. Be aware that Ru in oxidation stage four becomes explosive if heated over 105 C. Adding pressure speeds up the process substantially. The higher the pressure the faster the process is completed. Large scale refiners use up to 60 bar pressure, but that's far beyond the capability of backyard refiners.
Its amazing, the color is a, golden color, so crisp looking, I dunno how, but it do! Notice the lil face? When you zoomed in after the gold turn into chocolate milk, and it was so pretty!!!!
The chlorine tablet chemical can also be found in granular "shock". Just make sure its the same chemical composition, not calcium hypochlorite "shock". Could save time from having to crush a tablet...
Really neat removing the base metals with Nitric acid and using chlorine even tho it a much more dangerous method as much as bromine in refining gold and other metals. A friend wants to refine gold alloys (gold-copper) with bromine. However, bromine is very dangerous and can cause serious illness with prolonged exposure. So he going to use Nitric acid and conc Ammonia to react with the copper alloy.
Always enjoyable! Question: I'm curious. If silver crystal is the purist form of silver, is gold crystal the purist form of gold? If this is the case. Is there a way of putting gold into crystal form? This would be so cool to see, if the previous statement is true.
Sreetips has done experiments with electroplating gold. The results are amazing, but not viable for continuous use at his scale. Check his video library 😉
Yes it can be and has been done using chemical vapor transport. Gold is placed in a sealed ampule with small amount of chlorine. One end of the ampule is heated up to 300C, the other end up to 500C. At the 300C end gold reacts with chlorine to form AuCl3, which travels over to the 500C end where it decomposes back into gold and chlorine. The net effect is to move gold from the cool to the hot end and deposit it slowing into crystal shapes.
Hey, I'm sure you know this arrangement for a gas generator, but just in case... When I make a gas generator that uses a pressure equalizing addition funnel, I find that putting the gas takeoff adapter on top of the pressure equalizing addition funnel to be pretty convenient. That way you don't need to have a 2 neck flask or a flask with a hose barb on it. It also seems to help keep some of the impurities/steam out, but it's still a good idea to put a drying tube on top sometimes.
It seems to me that if nitric acid is so expensive, all the NO2 evolved while dissolving the silver & base metals could be bubbled through water with some extra oxygen to recover it back into nitric acid. Venting off the BFRC looks both expensive and bad for the environment.
Absolutely beautiful! And I thought your process was clean before 😳 It also looks like a very economic use of chemicals? I am hoping you can shed some light as to how much chemical amounts/cost were as compared to the more usual AR method you and most people use.. this looks absolutely insane for purity and a economical super clean process! A few times I’ve seen pure gold crystal in my usually so so dirty process. Not like this one! Sweet AU dude! Love the gas process! Thanks Sreetips ✌️PT
Thanks for your video. I always thought, dissolving gold is only possible using "Aqua Regia" (HCL+HNO3). Now I say you dissolving gold with H2O2 (HCL + H2O2 - I think). That's obvious: You can't dissolve gold with a very strong acid only. You additionally need an oxidation additive (like HNO3 or H2O2).
You know how I love nitric. But this is even cooler!!!! Is 12% H2O2 really much cheaper per ounce of gold. And finally, is the optimum inquartation the same as for nitric? I don't know why it would have to be since there is a different set of reactions going on.
If the solution is boiling, the oxygen rising from the hydrogen peroxide is eliminated very quickly, I advise doing it at a temperature below the boiling point and adding the peroxide dropwise. Good job.
Should have, but after Refining a thousand ounces in the last eleven years I could tell from experience it was all down. I need to start doing stannous test before and after precipitation EVERY TIME while doing the videos. Sorry
I’m giving it another look too. When filming and editing I’m frequently in doubt. But after posting and watching it again it’s like I can’t look away. They truly are captivating. 40 minutes goes by in a blink, even for me.
Sreetips I just found out currently 15% of the worlds industrial silver is used to make solar panels. I wonder if we need to chase the silver on these? Edit Australia just sent a newly designed panel to Germany for certification that is made from copper and has the worlds highest efficiency of 25%. It by passes the use of silver and brings the cost of production down significantly.
Hello sreetips! Hopefully all is well with you and yours! Just real quick question. With this chlorine gas project. Do you think it would work better and more efficiently for stripping computer boards of the gold trim better than the 2-3-4 weeks of them soaking in drain cleaner?
Technically yes, but very inefficient. Are you talking about just gold foils left on the board. If so then no. Their are still solder residues. Use hcl with an air bubblier and that will remove the gold traces and solder residue. You can then filter that to catch the foils for further refinement. NEVER put gold in solution with other metals until the VERY last step where as many metals has been remove as possible.
@AQUILLA REFINING I took my orbital with scraper to them. That's as far as I am so far. There is 418 pounds of unpopulated boards just looking for fastest solution. And Thank You for your time!
@@coreyfenn8856 Easiest method would be cyanide, but you're not skilled in that and it can and will kill you! It's not just gold you are seeing. Under that THIN gold layer is a layer of tin plated over copper that the gold is plated on. Only way to get that gold off besides Cyanide is the acid peroxide method. Wear a mask with that sander. Those particles are no joke!
You can get highly concentrated h2o2 from fish/aquarium stores maybe that will work better. It can be as concentrated as 30% to 50% if I remember correctly. Must be stored in a freezer though, H2O2 degrades at room temperature over time.
If you slow boil peroxide at around 80C from 1000ml down to 300 ml you will produce 30% Hydrogen peroxide. If you want to do a vacuum distillation, you can get it to 90%. That might be overkill here. What you gain in time from the higher concentration, you may lose in producing the concentrate to begin with. It's a judgement call
@@sreetips no you want to remove the chlorine gas before venting. You need a flask with a neutralizing solution (baking soda). The nazis used chlorine gas to kill people and even with a fume hood it needs t be neutralized first. It will also destroy your fume hood. By the way you should be bubbling nitrogen dioxide through water to stop metal corrosion.
HCl and Cl gases love to eat many plastics - I can recommend Viton, PFA or PTFE tubing. The Viton has an advantage of being flexible while PTFE is most resistant but has poor fitting and poor mechanical resistance.
@@sreetips Mine too. Silicone tubing hardened and eventually broke apart. There are flexible clear tubings that withstand ozone, so they might be good for halogens as well. I have PTFE for such applications but FPM and Viton might work too plus the flexibility.
Hi Sreetips, can you use hydrochloric acid in place of sulfuric acid when generating the sulfur dioxide gas with the sodium metabisulfate? Great video once again!
@@tamtgirl then why does it work when he puts it in the chloroauric acid solution to precipitate the gold? It still generates the SO2 then and there is only a few ml of sulfuric added to precipitate lead.
Wow; did the single distilled water boil take away all of the silver nitrate? I saw almost nothing when the HCL hit... One boil; I would have expected 5 based on seeing other washings in the past. Very awesome!
I boiled in nitric until the nitric was clear and colorless. Think it was eight consecutive nitric boils to get it there. All the silver was gone. It turn every so slightly yellow when I added the HCl probably due to a tiny bit of nitric still present.
What’s the saturation point for the H2O2 and gold? I’m clueless when it comes to the chemical aspects. But would it be more beneficial to cycle out the solution more often to maintain a higher solubility level? Keep up the awesome lessons! Great experiments!
The only down side i see is how long it takes. The hydrogen peroxide is defiantely a much cheaper way to process. Nitric is expensive especially when you have to get it shipped to you.
One viewer pointed this out: the nitric is only two cents per milliliter. It only takes 25ml to dissolve an ounce of gold. While it took two bottles of 3% hydrogen peroxide and still didn’t get it all dissolved
@@sreetips i would still use nitric for it. Makes the process simpler and quicker. Not to mention the one video you posted a while back that the ar solution almost turned to a syrup because it was so heavy with gold with so little nitric use.
You said you buy nitric at $300 for 15 liters, that makes each ml worth 2 cents. That would be cheaper than Hydrogen Peroxide since you only need 10ml to 30ml for a couple ounces, unless the price has gone up but even than the price would be cheaper
Yes! Theoretically it's a 3 to 1 ratio, but I would use about a 4 to 1, HCl to HNO3, by volume, although anything close to that is fine. It would take approximately 130ml of 30% HCl and 35ml of 67%-69% nitric to dissolve 1 troy ounce of gold - these numbers can vary slightly.
For a kitchen experiment with kids, you should take one cup of cold tap water and see how much salt (or sugar) you can dissolve in it. Once you see crystals on the bottom of the cup, that's it. That's how much salt cold water can dissolve. Then take that cup and put it in the microwave for a minute, pull it out and see how much more you can dissolve. It's the same concept here where a hot solution can hold more material in solution than a cold one. If you use sugar for this experiment and then let it cool slowly, the kids can eat the crystals afterwards :)
@@sreetips cal-hypo would be the way to go; I think, if you're just after the chlorine gas. I work in water park maintenance, and our cal-hypo is almost 80% available chlorine where the TCA would probably only be around 45% available chlorine.
Good morning. Have been watching a lot of your videos. Just curious as to how much it costs to get all the glassware, beakers, funnels, etc that you use? Is there a specific company you use to purchase from? Really is amazing what you do!!
Hey there sir I would like to say I appreciate the things you show about the refineing gold. I'm into it myself you've tought me lot . I do have a question I'm not that science tool taught what all do I need to get the so2 gas going through the lines clear tubes thank you very much
A few comments on the gas + liquid methods, if I may be so bold:
1) Chlorine gas is quite heavy and loves to dissolve into HCL, so you don't really need a bubbler below the surface of the liquid at all, eliminating the backflow risk so you don't have to watch it like a hawk. I use a 5L flask with 500ml of HCL + Gold and fill the extra 4.5L deadspace with Cl gas and let it stir until all the gas absorbs into the liquid to replace the Cl used up eating the Gold and repeat as needed. Less Cl floating off into the hood makes those ventilation fans and ducts last a whole lot longer as a bonus.
2) You can drip your HCL into plain old laundry bleach to get the Cl. Less gas overall, but cheap as dirt and you can live with less using the above method.
3) Once you have your final gold solution, you can heat it up to drive off all the Cl, it'll all be gone well before the boiling point so the first boiling lets you know it's done. This'll speed up your later precipitation and skip any risk your stannis test might be fooled. Same is true for the SO2. You can warm up the waste solution after your precip to toss out the SO2 in your fume hood and make the stock pot loads less stinky later on.
4) You can drop plain old HCL onto your SMB to get SO2 gas. The only little issue is that the reaction is endothermic so your flask can turn into an ice cube if your precip takes too long.
5) Love your work. This channel sent me down the grocery/hardware store path back in the day when this info was much harder to come by and everyone else was showing the expensive way. Big thanks!
Thanks for confirming point 4 about the HCL with SMB.
Sulfuric acid is not easy to get and expensive for me so it’s good to know there is a cheap and easy alternative.
Excellent points, thank you. I hate working with sulfuric. It’s viscous like oil and gets every where if not careful.
I did the chlorine bubbling with a pear-flask and a long stem tube adapter with vacuum port. I let the vacuum port pass through a neutralizing bath in case any gas passed through the gold solution instead of just venting it outside. By cutting the long stem to the appropriate length I got a very nice agitation with no stir-bar and the gas had maximum time to be absorbed in solution. During the settling it worked well too.
“when *we* changed all those connections” hits hard… making me feel like I’m involved in the process 😢😭 We love you sreetips!!!!!!!!!
It straightened out all the problems that I was having.
Hey sreetips I keep hearing you say on your videos you're not a chemist. As far as I'm concerned you're absolutely an industrial inorganic chemist no matter whether you've been to university or not. You follow the scientific method every single time... hypothesis, experiment, draw a conclusion, then refine your hypothesis and so on until you've perfected the method. Better than plenty of 'chemists' I've worked with! Well done! Your video skills behind and in front of the camera improve all the time too. You're a really personable, humble guy and very likeable. From this pro-media guy, you've got something really special going on here. Love it!!
Thanks Andy!
I’ll never cease to be amazed at how quick boiling nitric acid dissolves silver. Such a cool thing to see.
That footage make the acid look angry!
If you cooled the bubbler it might work quicker. Cold solutions can dissolve more chlorine. Awesome video, I love that you try new techniques.
23:12 Who needs a lava lamp when u can watch gold dissolving away in chlorine. its pretty relaxing watching this part.
Been watching you for years. Always a joy to watch you work. It's been great seeing your technique improve and grow, and to see your lab and methods become more refined. It's amazing!
Yay another great video! Thanks so much Sreetips. As a Geochemist I completely geek out on this stuff. Even after 30+ years I still love my job and I love the science.
Here here! Bravo! It’s a privilege to work with these metals. And a bonus to show off the results.
There is just something about this channel that I just love. Not sure if it’s sreetips sultry southern voice or the chemistry of it all but gosh dang am glad he’s gettin up there in subs.
You should hear my Deep Southern drawl! lol
Bravo! Thank you
Boy you showed us a great cost saving process. THANK YOU SOOOOO MUCH SREETIPS ! You are the Best.
Wow that might be the purest gold powder ever made by a single refining. Typically it would take multiple refines or the electrolysis process to get the gold that fine. I’d say that’s .999+ all day long especially since there were actually gold crystals in the mix. Awesome work and beautiful to watch.
You are the best refiner i see in may life ! Thank you teacher !
Probably because I’m the only refiner you see. Most wouldn’t be caught dead revealing their secrets on social media. Makes me a bit of an outcast amount the refining community.
I don’t even mess with gold and I love your videos. Man it’s something about watching the process
Watching SMB go into liquid gold is always so awesome to watch.
Love to watch a PRO handle acids like that! great video
I’m not a PRO just an advanced beginner
Set up your dripper for that H2O2.....great video, you are perfecting everything in front of you from the gold to the silver cell....awesome to watch brother!
That 12% H2O2 is a prime candidate for a drip feed
you should try to increase the surface area of the gold to get it to dissolve quicker. If you pour the molten gold onto a fast spinning cold metal cylinder you can get a thin foil ribbon.
Absolutely wonderful I like the different processes that you approached it with and hitting it with a bright light at the end of the run to illustrate what a color change that was was fantastic
Looks like we'll see a Silver Cell Harvest in a day or two - ALWAYS looking forward to them!
To improve dissolution, you can use a dispersion tube (gas inlet tube with sintered glass ending) - dispersing requires more positive pressure so a check valve is a good safety measurement. Cooling the solution helps dissolving the gas.
Good points, thanks
The gold that didn’t go into solution must be some of the purest and most resistant on the planet. I want it
It eventually went with the chlorine.
Really nice! I am accumulating the equipment to do my first gold refining. Almost ready. I read Hoke's book too.
It all starts with that first spark of interest sir!
Don't forget the fume hood for Pete's sake.
Good luck in your endeavor.
Start w small batches and practice every step, rewatch all of Screetips videos.
Quality equipment will make a difference too. 👍
Love the silver cell and the gold solution looks great.
Simply awesome gas-based purification reactions 👏👏👏
the gas way : dissolution by gas in chloridric, cement by sulfuric gas, wow ! nice video, thanks !
Try keeping the temp of the solution below boiling (160-170F) when using hydrogen peroxide to dissolve metals. It helps reduce the bubbling a lot. A large amount of the bubbling is from the high temperatures breaking down the peroxide into oxygen gas and water. Thus wasting peroxide and slowing down the operation.
Ok, I’ll give it a try, thank you
Great instructive video! I was wondering, if you turn off the stirrer when the gold precipitates, how much larger could the crystals be?
SMB dissolves far better in harmless cheap glycerin. In my opinion you would need far less of that sort of solution than spooning in SMB by the truckload into your aural solution :) It's also reputed to be a good rust-stain remover. Great video and, by the way, that sudden flashover from aural solution to gold powder is fascinating to watch... Well done mr Sreetips
Diggin this channel maan. Absolute alchemist mate 🤛
You could use the gas generator for this reaction. Inquarted gold in the bottom + HCl and put the H2O2 at the top and let it drip.
Will you be going with the bubbler method for further refinements?
A) it seemed to be easier in a sense, quicker, had an insanely beautiful outcome, and possibly much cheaper to refine.
B )It was a thrill to watch as a viewer :)
I don’t know, I’ll have to think and maybe get some experience with a larger batch to judge.
The SO2 reaction is starting to be my favorite. Wonderful video as always.
Dissolving gold with Chlorine Gas is most efficient when the raw material is in powder form, as large surface area is necessary for the gas to attack. Precipitated gold or anode slimes are perfect materials for this process; so are ball milled ore too. Lumps of gold or plated connectors, use fx. AR (Aqua Regia). Printed Circuit Boards or mobile phone boards, use fx. Cyanide.
The majority of commercial refiners use this Chlorine process for both gold and the "six sisters" Pt, Pd, Rh, Ru, Ir, Os (the latter three usually requires an additional step) with an impressive extraction rate of 99.5%. An improved process is gaining ground among commercial refiners: Using a blend of 50% Chlorine Gas and 50% HCl gas (which is not HCl acid, but a mix of Hydrogen and Chlorine gas) results in an incredible recovery rate of >99.9%.
The best way to carry out the Chlorine process is to heat the HCl acid between 60 C to 105 C. Most common carefully controlling the temperature at exactly 95 C as a precaution in case Ruthenium is, or may be, present in the raw material. Be aware that Ru in oxidation stage four becomes explosive if heated over 105 C.
Adding pressure speeds up the process substantially. The higher the pressure the faster the process is completed. Large scale refiners use up to 60 bar pressure, but that's far beyond the capability of backyard refiners.
Its amazing, the color is a, golden color, so crisp looking, I dunno how, but it do!
Notice the lil face? When you zoomed in after the gold turn into chocolate milk, and it was so pretty!!!!
Great video, I really liked the time lapse and all the gas generators. Also that gold looks amazing.
Nice to know you had a seat right next to us to enjoy the show!
It was awesome
Really enjoyed watching this and learning of different methods to dissolve and precipitate gold. Looking forward to more new information.
The chlorine tablet chemical can also be found in granular "shock". Just make sure its the same chemical composition, not calcium hypochlorite "shock". Could save time from having to crush a tablet...
That was tedious, granules would be much better
Really neat removing the base metals with Nitric acid and using chlorine even tho it a much more dangerous method as much as bromine in refining gold and other metals. A friend wants to refine gold alloys (gold-copper) with bromine. However, bromine is very dangerous and can cause serious illness with prolonged exposure. So he going to use Nitric acid and conc Ammonia to react with the copper alloy.
Always enjoyable!
Question: I'm curious. If silver crystal is the purist form of silver, is gold crystal the purist form of gold? If this is the case. Is there a way of putting gold into crystal form? This would be so cool to see, if the previous statement is true.
Sreetips has done experiments with electroplating gold. The results are amazing, but not viable for continuous use at his scale. Check his video library 😉
Yes it can be and has been done using chemical vapor transport. Gold is placed in a sealed ampule with small amount of chlorine. One end of the ampule is heated up to 300C, the other end up to 500C. At the 300C end gold reacts with chlorine to form AuCl3, which travels over to the 500C end where it decomposes back into gold and chlorine. The net effect is to move gold from the cool to the hot end and deposit it slowing into crystal shapes.
@@macoppy6571 I had forgotten that Sreetips did this. I do recall seeing it. Thanks!
Cool video. I"d never seen that last reaction before. Nice job.
Hey, I'm sure you know this arrangement for a gas generator, but just in case... When I make a gas generator that uses a pressure equalizing addition funnel, I find that putting the gas takeoff adapter on top of the pressure equalizing addition funnel to be pretty convenient. That way you don't need to have a 2 neck flask or a flask with a hose barb on it. It also seems to help keep some of the impurities/steam out, but it's still a good idea to put a drying tube on top sometimes.
That’s a good tip, never thought of it, thank you
It seems to me that if nitric acid is so expensive, all the NO2 evolved while dissolving the silver & base metals could be bubbled through water with some extra oxygen to recover it back into nitric acid. Venting off the BFRC looks both expensive and bad for the environment.
Agree
Absolutely beautiful!
And I thought your process was clean before 😳
It also looks like a very economic use of chemicals? I am hoping you can shed some light as to how much chemical amounts/cost were as compared to the more usual AR method you and most people use.. this looks absolutely insane for purity and a economical super clean process!
A few times I’ve seen pure gold crystal in my usually so so dirty process.
Not like this one! Sweet AU dude!
Love the gas process!
Thanks Sreetips
✌️PT
Thanks for your video.
I always thought, dissolving gold is only possible using "Aqua Regia" (HCL+HNO3). Now I say you dissolving gold with H2O2 (HCL + H2O2 - I think). That's obvious: You can't dissolve gold with a very strong acid only. You additionally need an oxidation additive (like HNO3 or H2O2).
H2O2 didn’t have the punch - the chlorine kicked it butt!
You know how I love nitric. But this is even cooler!!!! Is 12% H2O2 really much cheaper per ounce of gold. And finally, is the optimum inquartation the same as for nitric? I don't know why it would have to be since there is a different set of reactions going on.
If you use a glass funnel for a lid instead of a plate you can add to the reaction without having to move a lid every time.
That’s a good suggestion. Thank you
FANTASTIC! ABSOLUTELY JAW DROPPING!!!!!
That stuff from Sally"s is what I use to bleach the bromine out of plastic. I use the gelled version so it sticks better.
I found out by accident that 12% will remove a silver nitrate stain from skin - but it hurts!
If the solution is boiling, the oxygen rising from the hydrogen peroxide is eliminated very quickly, I advise doing it at a temperature below the boiling point and adding the peroxide dropwise. Good job.
It’s got to have lots of heat
@@sreetips The best thing if you don't want to use aqua regia is ClH 6M + Cl gaseous saturated at 30/40 C ° with stirring
Rookie question: No stannous test at approx. 19:30 to make sure all the gold precipitated?
Should have, but after Refining a thousand ounces in the last eleven years I could tell from experience it was all down. I need to start doing stannous test before and after precipitation EVERY TIME while doing the videos. Sorry
This method is really cool to watch , thank you sreetips !
Going to have to watch again outstanding stuff two thumbs
I’m giving it another look too. When filming and editing I’m frequently in doubt. But after posting and watching it again it’s like I can’t look away. They truly are captivating. 40 minutes goes by in a blink, even for me.
you should boil the gold powder in hydrochloric then distilled water then dry completely then do another boil in nitric acid for the purest gold.
Excellent, thank you
Sir, you are great 👍 learn lots of new things from you.❤❤❤ keep it up Sir
Sreetips I just found out currently 15% of the worlds industrial silver is used to make solar panels. I wonder if we need to chase the silver on these? Edit Australia just sent a newly designed panel to Germany for certification that is made from copper and has the worlds highest efficiency of 25%. It by passes the use of silver and brings the cost of production down significantly.
Thanks for sharing this new technique with us, you are the man
Hello sreetips! Hopefully all is well with you and yours! Just real quick question. With this chlorine gas project. Do you think it would work better and more efficiently for stripping computer boards of the gold trim better than the 2-3-4 weeks of them soaking in drain cleaner?
To may metals involved sir.
@@goldrefining even after they are cleaned off? And thank you very much for answering! All input is much appreciated.
Technically yes, but very inefficient. Are you talking about just gold foils left on the board. If so then no. Their are still solder residues. Use hcl with an air bubblier and that will remove the gold traces and solder residue. You can then filter that to catch the foils for further refinement. NEVER put gold in solution with other metals until the VERY last step where as many metals has been remove as possible.
@AQUILLA REFINING I took my orbital with scraper to them. That's as far as I am so far. There is 418 pounds of unpopulated boards just looking for fastest solution. And Thank You for your time!
@@coreyfenn8856 Easiest method would be cyanide, but you're not skilled in that and it can and will kill you! It's not just gold you are seeing. Under that THIN gold layer is a layer of tin plated over copper that the gold is plated on. Only way to get that gold off besides Cyanide is the acid peroxide method. Wear a mask with that sander. Those particles are no joke!
One of these times you should add a bit of lead to the process so one can see how the sulphuric acid precipitates the lead
I’ll make a video about this one day. Thank you
Wow! That first pour off looked like ice cone syrup!
You can get highly concentrated h2o2 from fish/aquarium stores maybe that will work better. It can be as concentrated as 30% to 50% if I remember correctly. Must be stored in a freezer though, H2O2 degrades at room temperature over time.
Thanks for that. I’ll check into it.
Absolutely amazing. Nice gas generator.
If you slow boil peroxide at around 80C from 1000ml down to 300 ml you will produce 30% Hydrogen peroxide. If you want to do a vacuum distillation, you can get it to 90%. That might be overkill here. What you gain in time from the higher concentration, you may lose in producing the concentrate to begin with. It's a judgement call
Some have said higher H2O2 can be bought at various locations over the counter. I just need to check
It would be interesting to dissolve a known quantity of lead into a batch of gold and see how quickly and easily Sulphuric acid precipitates it out?
I’ve had requests for this - may have to do a video on it.
You can dissolve gold by adding sodium hypochlorite (pool chlorine) into hydrochloric acid which will generate chlorine in solution.
Excellent, thank you
you need to bubble the exhausting chlorine through a neutralizing bubbler.
Or back through the solution for multiple passes - now that would be a cool apparatus.
@@sreetips no you want to remove the chlorine gas before venting. You need a flask with a neutralizing solution (baking soda). The nazis used chlorine gas to kill people and even with a fume hood it needs t be neutralized first. It will also destroy your fume hood.
By the way you should be bubbling nitrogen dioxide through water to stop metal corrosion.
At 10.00 Minutes ... BOOM gold in sol. ... Nice job!!!
Ya kno, sometimes wish I would of stayed in school, for chemistry, I always enjoyed it in high school
MINDBLOWING!!!!!
Cool.. I like to see new experiments.
Awesome vid of gasGold. lovely.
Good work Sreetips! As always very informative!!
Yay for new techniques! Great content. ❤
Thanks again for the content.
HCl and Cl gases love to eat many plastics - I can recommend Viton, PFA or PTFE tubing. The Viton has an advantage of being flexible while PTFE is most resistant but has poor fitting and poor mechanical resistance.
I’m using the clear tubing from ace hardware. After running gas a few times they get rock hard
@@sreetips Mine too. Silicone tubing hardened and eventually broke apart. There are flexible clear tubings that withstand ozone, so they might be good for halogens as well. I have PTFE for such applications but FPM and Viton might work too plus the flexibility.
PTFE in straight aways. Sleeving with degradable plastic. Simple. Hetero tube fit. Replace unions as needed.
Hi Sreetips, can you use hydrochloric acid in place of sulfuric acid when generating the sulfur dioxide gas with the sodium metabisulfate? Great video once again!
i'd say no, you need the extra sulfur
@@tamtgirl then why does it work when he puts it in the chloroauric acid solution to precipitate the gold? It still generates the SO2 then and there is only a few ml of sulfuric added to precipitate lead.
I was thinking the same thing
H2O2 will lose an oxygen molecule at about 140F and turn into H2O
if you heated to just below 140F you may get faster results.
32% HLC boils at 84F
I’ve tried lower temperature. Nothing happens until I crank the heat and get it boiling.
Very cool video.
Wow; did the single distilled water boil take away all of the silver nitrate? I saw almost nothing when the HCL hit... One boil; I would have expected 5 based on seeing other washings in the past.
Very awesome!
I boiled in nitric until the nitric was clear and colorless. Think it was eight consecutive nitric boils to get it there. All the silver was gone. It turn every so slightly yellow when I added the HCl probably due to a tiny bit of nitric still present.
What’s the saturation point for the H2O2 and gold? I’m clueless when it comes to the chemical aspects. But would it be more beneficial to cycle out the solution more often to maintain a higher solubility level? Keep up the awesome lessons! Great experiments!
Yes, I’ve done that in the past
I need to save money and this comes up in my recommended. RUclips is cold sometimes 😂
man i LOVE those antique acid bottles you have! where did you come across those?!
eBay: www.ebay.com/itm/Vintage-Nitric-Acid-Glass-Bottle-5-1-2-HNO3-Apothecary-Lab-Glass-Penny-Stopper-/174915903139?mkcid=16&mkevt=1&_trksid=p2349624.m2548.l6249&mkrid=711-127632-2357-0
Fascinatingly entertaining as always, God bless!
With the more concentrated hydrogen peroxide maybe setting up a drip feed would be good, only adding a few drops at a time in a constant flow.
This reaction would be a good candidate for an H2O2 drip feed
I always pucker up a little when Sreetips pours off the water into the sink lol
The only down side i see is how long it takes. The hydrogen peroxide is defiantely a much cheaper way to process. Nitric is expensive especially when you have to get it shipped to you.
One viewer pointed this out: the nitric is only two cents per milliliter. It only takes 25ml to dissolve an ounce of gold. While it took two bottles of 3% hydrogen peroxide and still didn’t get it all dissolved
@@sreetips i would still use nitric for it. Makes the process simpler and quicker. Not to mention the one video you posted a while back that the ar solution almost turned to a syrup because it was so heavy with gold with so little nitric use.
Sometimes when you pour the waist acid onto the silver, my brain thinks your just playing with the acids for a cool reaction😎😉
You’re right, I like watching it and figured viewers would too.
1K+👍's up sreetips thanks for sharing
you are amazing
You said you buy nitric at $300 for 15 liters, that makes each ml worth 2 cents. That would be cheaper than Hydrogen Peroxide since you only need 10ml to 30ml for a couple ounces, unless the price has gone up but even than the price would be cheaper
Sound right
Fantastic video
that was some sparkly goodness!
Great information and extremely helpful.
It's been a few years since now, but I think I dissolved gold with vinegar 60% and salt.
I’ll bet it was messy. My vinegar experiments were.
Can you put some lead in solution so we can see what happens when you add sulfuric acid please?
I’ve had this requested before. I’ll come up with something
Is there a maximum amount of gold that will dissolve into that 200ml dose of hydrochloric acid?
Yes! Theoretically it's a 3 to 1 ratio, but I would use about a 4 to 1, HCl to HNO3, by volume, although anything close to that is fine. It would take approximately 130ml of 30% HCl and 35ml of 67%-69% nitric to dissolve 1 troy ounce of gold - these numbers can vary slightly.
I got 15 Troy ounces dissolved in about 500ml of liquid once. But I had to evaporate it down to achieve it: ruclips.net/video/XCSss8Ul1qg/видео.html
For a kitchen experiment with kids, you should take one cup of cold tap water and see how much salt (or sugar) you can dissolve in it. Once you see crystals on the bottom of the cup, that's it. That's how much salt cold water can dissolve. Then take that cup and put it in the microwave for a minute, pull it out and see how much more you can dissolve. It's the same concept here where a hot solution can hold more material in solution than a cold one. If you use sugar for this experiment and then let it cool slowly, the kids can eat the crystals afterwards :)
Maybe use an addition funnel to add the peroxide
Drip it in slowly
If those are calcium hypochlorite tablets, you buy by then in an already powdered form
It’s TCA - trichloroisocyanuric acid. But I think calcium hypochlorite (bleach) would work as well
@@sreetips cal-hypo would be the way to go; I think, if you're just after the chlorine gas. I work in water park maintenance, and our cal-hypo is almost 80% available chlorine where the TCA would probably only be around 45% available chlorine.
Liked this one lot! Very well done!
Good morning. Have been watching a lot of your videos. Just curious as to how much it costs to get all the glassware, beakers, funnels, etc that you use? Is there a specific company you use to purchase from? Really is amazing what you do!!
He did a video on that about a year ago. It explained a lot.
I bought all the glassware on eBay
Hey there sir I would like to say I appreciate the things you show about the refineing gold. I'm into it myself you've tought me lot . I do have a question I'm not that science tool taught what all do I need to get the so2 gas going through the lines clear tubes thank you very much
I use sulfuric acid and SMB.
Outstanding!