I've always loved the sight of wet brown gold powder flashing over while drying. Looks like success

I love the longer videos like this occasionally. It's nice to see the whole process in one sitting. Thank you talking us through what you do. It is greatly appreciated.

Yess! Computer scrap again!! Nice little gold bead. Would love to see more of this content coming next 🙌🏻 i learned the hard way not to throw them straight into the aqua regia but it would be a great experiment for another video

Yahoo!! Computer scraps. I love these process videos 🙌🏻 Hope you’re having a wonderful week, Sreetips

I always love Sreetips and the sweet asmr vocabulary trigger words: Beaker Precipitate Nitric (acid) Gold (foils as well in this case) Solution Dilute Distilled Heat Melt dish Pour I know i missed some lol. Those are always just some of my personal favorites.

Love what u do with gold and silver, best channel on KZfaq. Fantastic work 👏 👍

Thank you Senior Chief! I have wondered about this for quite awhile. The best I have ever done from trimmed fingers was 1.5 grams per pound. Bravo!

thanks for another great video Mr Sreetips. I’m a chemist and I love watching your videos.

I love these videos and I really love that Sreetips patiently interacts with the commenters here! Cheers

And just love when the bar is pourd the way the gold look just amazing

Wonderful video Sreetips! It never gets old. I love how you never let anything go to waste. At the end of the video, using the dilute H2SO4 you used to clean off the gold button to keep your sink plumbing clear. No need to buy Draino. 😆

Love watching you work! Thanks

I focus on this exact process and have learned a TON from this channel. I forgot though that the gold isn't pure when on the fiber card, so no wonder why my yields were smaller than I expected!

Gooooood evening from central Florida! Hope everyone has a great night!

The fact that you use all of this scientific equipment and *Corningware* to refine gold makes me happy. I have the cornflower blue pattern, btw 😁

Man just love watching these videos so much to learn here

Love it. Thanks Chief!

you perfected teh method of extraction so much , now you create less waste , congrats :)

*sreetips* Bravo well done, thank-you sir for taking the time to bring us along. GOD Bless.

That was very easy to watch. Good result too.

You make it look so easy.

Nice looking forward to seeing how well the aqua rega works for 1 step

Hello friend, the RAM or graphics card cinguers are 100% lacquered. Entering the test slot eliminates only the contact area. * The most correct method is with caustic soda, it only destroys the lacquer and the copper comes off with the clean gold, the PCB remains colorless. * In principle, the gold of cards is a hard alloy of industrial carat 20kt and some have triple layers finished in 22 or 23kt, this always in graphics. * attention, the carats described are similar to jewelry but these are industrial and therefore toxic, follow the steps of this channel to always have clean and non-toxic gold With this general method, it is best to first remove the lacquer adhesive, which only takes minutes to separate the metals from the fiberglass and process them later. I process caustic soda with this method and it is much faster since only the washing and direct to the aqua regia

You are welcome. A nice recovery, well worth the time and effort for both you and the fortunate viewers. Thank you Sir!👍👍🤟

Happy to see you doing an ewaste video! I’m just about to finish up 30+ lbs of fingers, about 160 grams of foils. Couple thoughts… 1. Would have been nice to see you show people how to denox solutions using sulfamic acid! That 1 lb of SMB isn’t cheap where I’m at! 2. The average yield for fingers is 1.8 g/lb, which is right in line with your results! Love watching your videos when I’m not out doing it myself, you should try and source some gold cap ceramic ICs to do on the channel. They contain farrrrrr more gold per pound than fingers do and are fun to process! Thank you for the video, look forward to the next installment!

At round 18:40 when you start pouring the solution into the filter and said "valuable Liquid" I swear the background noise started sounding like a drum roll!! 😁

Excellent Chemistry Sreetips 🏴‍☠️ Thanks for sharing with us 🙏 God Bless

so cool watching the time lapses...

That was fun. Thank you Sir

Fun to see something a bit different. :)

Gold fingers are one of the few e-scrap parts you can dump into nitric and not end up with horrid metastannic acid (a tin complex), which is 'grey goo' that's god-awful to separate out. For most parts, a long soak (about a week in warm conditions) in HCl with some copper chloride mixed in gets rid of the base metals. Even plated pins will give you grey goo, because the soldered end ALWAYS has a lot of tin, and often the core of the pins is tin-containing brass, which created HUGE amounts of goo in nitric acid.

Good job

YES! I love these!

that's a nice chunk man

great video!

Wow that little bead on Ebay is WAY over spot price on gold per gm rn on the market. That is insane how many bids it has tbh and how many folks are willing to pay an 80-100 $ premium. Good job lol xD.

Good job love what you do ❤

Cool experiment to try: iron nitrate (either +2 or +3 oxidation states) in solution decomposes into iron oxide (black solid) and NO2 gas or nitric acid (depending upon the oxidation state of the iron) when heated over 90C (basically heat to a light simmer). The NO2 or nitric acid vapor is easily distilled back into usable dilute nitric acid!

Awesome video thank you 😊

Ive used dilute KMNO4 to etch pc boards (using an aquarium aerator). Would its use liquify the copper under the gold, leaving only the gold foil behind? This method might float the foils to the surface where they could be scooped off periodically...... great videos. I especially like it when you show the books you refer to. Many thanks.

Dang that bead sure was bright! 😃

Awesome vidography in this episode brother. Have you hired a camera man. Nice to see another method with a different result. Great show brother looking forward to the final results

For such a thin gold foils you can use "Gold leaching method". You may use chinese reagent "Jin Chan" in combination with Ferricyanide (K₃[Fe(CN)₆]) to wash off the gold.

That 10K ML beaker must have raised some eyebrows when you ordered it! 😂

Very nice turnout from that scrap sreetips 👍

a subtle shout to Nurdrage. I like it!!! Glad you watch, he's one of my favorite chemtoobers.

Super valuable info sreetips amazing 👏

That's the greenest Gold Brew I've ever seen 🐉

King Midas does it again ~ ! ! ! Great Video !

That's a lot of fingers. On one hand I like the idea of recycling but at least some of those original devices could have been godsent for retro enthusiasts and collectors.

vibration table -- the friction between the card clips will knock a lot more loose...

Awesome

Awesome video nice gold button thanks for sharing sreetips

I would like to see you try the process of using tincture of iodine to remove the gold foils.

I appreciate for someone who would normally use Freedom Units in their daily life that you use metric measurements in your videos. Us metric natives generally call milliliters, "mills" though.

I'm wondering if you could speed up the base metal solving process by using ultrasonic (combined with heat).

A beautiful button, with 15 Lbs of computer scrap there’ll be lots of great videos to come. 👍🏻

41 minutes, Sreetips bros are eating good

Doing aqua regia while the fingers were still present was pretty effective

I need to do something soon with all of the computer cards, memory , motherboards & chips I have saved up over the years . I'm interested in what it will be like going straight to the aqua regia .

Good evening from SC really wish my AP chemistry teacher did this would have enjoyed a lot more

Very great video.

I love watching these videos such interesting time we live in where recycling can profit or bring different forms of value.I’m excited for the next years of innovation and recycling.

Are ever going to Write a book on refining that would be great 👍

When I did a batch of fingers, after rinsing, I put all the pieces of board into a plastic tub and scrubbed off every last speck of gold from every tiny piece of board... I'm kinda obsessive-compulsive like that. ;D I just hate having to wash the board pieces over and over to recover all the gold chloride bound up in the fiber board. Creates a lot of waste solution.

i know you've had issues with the fumes eating up the blower in the fume hood. but where on your house does it ventilate to? do you have a pvc pipe that goes up high so the fumes dont eat up the side of your house or roof?

Awesome !!

Very nice sir very enjoyable thank you for sharing this with us six stars

Awesome proces mr Sreetips...that 3.7 grams gold is super cool man! Keep it UP mr sreetips your chanel is geat man 🎉😂i love the science cause i a scientist to haha algebra mathmatics physics are great !👍🇳🇱

I would think if this was your main source of gold, you could do a two step process. Do the primary with nitric/AR and jave a secondary AP bucket to nibble off the residual over time

hi sreetips. great video. when removing the foils, you don't think there is any silver being dissolved with the copper and other hunk metals?

0:21 “I ordered some computer scrap” [opens box] …it’s a water pump for a 2012 Chevy Traverse. 🤔😂 That would have been just awful. 😂

if this batch was only 2 pounds, you get to run this process about 6 more times to do all 15 pounds :p you got way better at processing these circuitboards, i remember the first try you had it bubbling outside for like 9 days. looking forward to the next vid as always ^^

If we could just flood Fort Knox with aqua regia and collect the runoff. Ah, dreams! Great video!!!

My god that beaker!

So glad you've never accidentally dropped your hydrochloric acid bottle while trying to show it off lol

It would be interesting to use this refining as a control to compare to a bunch of other methods. You said you are going to try dissolving the gold immediately without clearing out the base metals first, but you could also try incinerating all the material, or using the bubbling method, or anything, and, if you use 2 lbs each time, you have a good result to compare it to.

I enjoy watching the recovery process. I am interested to see what the cost of the process is compared to what you extract from the boards. Thanks for the great shows

Always wondered the fineness of the gold foils. If they are really around 50% or 12k thats good enough for me to skip the refining part. I always wanted to just recover the foils then melt them because in my country the nitric acid is so expensive the cost of using it out weighs the value of the yield. But if the foils are around 12k, I could melt them into a bar and still get decent money for it without refining. Like your original video from years ago where you bubbled them off in HCL for 3 weeks, that will be the method I will need to adopt. Wish I could use nitric as its so much faster!

Considering the labor time, energy, chemicals etc. I wonder if pulverizing and gravity separation should precede refinement. Pulverizing probably would take minutes and gravity probably under an hour lending to 3.6 grams 525 / hr.. Not sure?

that is a big ass beaker...mother of gosh

Mr. Sreetips, there is another method easier to release the gold foils of the fibreboard by using the heat gun, I wish you’d try it once, your channel is my favourite one ever

Back of the napkin math says you should get 1 troy ounce that entire box if you processed all together. I wonder if the seller knew that and thats why they sell in batches of 17 pounds?

all my old waste material if it has values left i put in a slow leach pot which has 2 litres of HCL and about 8 table spoons of sodium nitrate. I leave if for a month and keep swapping it out with other materials until i get some good values to chase and recover.

You should test Eco-Goldex E Series.

Would it be possible to cook the goldfingers first in boiling water, then after cooling put them into an ultrasonic bath, and afterwards collect the peeled-off gold films for further processing ? It could save a lot of chemicals.

Question: would a square, wider base more surface area or rectangular casserole dish be more effective than standard beaker shape.

is there a smell when you are refining or does the fume hood get it out? and if it does smell does it smell like old coins?

Damn...close to being first People are fast to watch your videos Cheers Brother

I realize that this might also be a bad idea but i can't help but think that running the entire bulk material through something like a ball mill to break down the material might be a better way to process the trimmed fingers. Since the fiber board is basically non reactive you could treat the powdered fingers with nitric and then aqua regia no?

when it comes to precious metal recovery and refining your channel is the one I truly trust, so I'm going to ask you if you could do a 2024 test to see if you can still get platinum group metals from mlcc I ask this as a big favour as I know you hate doing computer scrap please

Pretty good yield for escrap fingers. I have an off topic question. When you refine silver with lye and sugar, do you use hot or cold water to do the rinses? 😊❤

I wonder if incinerating the pcb would work? It seems like it should be possible to incinerate it, then dissolve the remains in nitric, leaving behind mostly just the gold??

I was also thinking, if this is the only way to get the foils off, can you put the lot in a tumbler device to agitate and shake off all the stubborn foils still stuck on? Or maybe boil it and let the bubbles get all the foils off?

Is there a way to mechanically remove the foils like with a blade or bash them with a hammer? Would be tedious work but I'm sure the yield would go way up.

It would be interesting in the end to have you roll app exactly how much you recovered from all of that how much the cost of the chemicals was VS how much the cost of the electronics work I already can estimate your time and including making the videos you've already far exceeded whatever the worth of the gold is but it would be nice to see it broken down in the end

Hey Chief, I've got an idea - it may be stupid, and if it is just let me know. Jason over at MBMMLLC has done experiments where he runs whole computer boards through his hammer mill and recovers all the metal on his shaker table. It's mostly copper, with lead and tin solder - but there's a surprising amount of gold and silver in there. He's asked for a cost effective method of getting the precious metals out. What would happen if he melted all the metal into a bar and use that copper alloy bar to cement out metals in a stock pot? Shouldn't the base metals go into solution and the precious metals drop out in the mud at the bottom of the stock pot?

The nitric solution at the beginning: is there not any chance of silver in it? Wouldn't it be better to drop as waste into he copper bucket just in case?

About a 4079 ppm yield. Very good result.

Didn't you used to use Peroxide for these trimmed circuit fingers?