Efficiently Recover Nitric Acid and Copper Metal From Copper Nitrate Wastes
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- Опубликовано: 2 окт 2024
- In this video we Efficiently Recover Nitric Acid and Copper Metal From Copper Nitrate Wastes by reacting copper nitrate wastes with sulfuric acid to generate nitric acid and copper sulfate. Then we electrolyze the copper sulfate to recovery copper metal and sulfuric acid.
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Next video will probably be on chemical resistance of palladium metal.
Sounds intriguing, I'm sure it will be a great video. If I may make a suggestion for the video you should demonstrate the dilute sulfuric acid method and show precipitation using SO2 (via sulfite). The other basic techniques are very well known and great for noobs, but the professional refiners like myself will likely learn very little. I really like your video format: concise, professional, and informative! Keep up the great work. Bravo for paying attention to your subscribers comments and your dedication to science. Steve
Would be interesting to see a video on recovering silver from silver sulphide, I have a few bottles of used photographic fix I’ve been pondering about using one day.
Trying to civilize the wild west of precious metals refining, eh? About time. Tired of watching DIYers dissolving and precipitating precious metal solutions in an endless loop, trying to squeeze out the last bits of metal, doing everything by rote, eyeball, and guesswork. What you've done here is refreshingly straightforward and waste free (by "waste" I mean usage of vast quantities of metal, acids, bleaches, peroxides, etc. thorough inefficient processing, not necessarily waste the way chemists usually mean.) I want my chemistry porn to be cleaner!
GOOD
@sreetips will thank you when he sees this message. Should give him some ideas I hope. Thanks for the excellent videos. Much appreciated.
Copper Nitrate is such a beautiful shade of blue...
Lol. A few years after I asked, but better late than never :P Now if I can ever get my recovery lab put together....
To speed up the electrolysis, you can do a time lapse :)
And use NileRed's time lapse music!
Been watching Nurdrage for 10 years, never seem to get enough of it. still get excited when I see a new video, otherwise I’ll just watch one of the old ones.
Been watching him since, I think, 2006, when he destroyed that barbie ken puppet.
This is what happens to processes of hobby refiners when the real science comes in! Thanks NurdRage, you are the real professional!
I've been recycling my copper nitrate for years...I first posted on the GRF about recycling copper solution over 10 years ago. If you plan on doing any serious refining, recycling your waste is not only the right thing to do environmentally, but also economically. That being said, NR has a very special way of presenting material that makes it understandable even to the layman. He is a valuable resource for everyone in the refining community. Steve
@@lazersteve How do you recycle your sulfuric acid that is contaminated with base metals?
@@bormisha Depending on which base metals are in there really. The typical recovery protocol for sulfuric acid is to evaporate out the water and other more volatile substances (distillation of volatile acids if pesent ) followed by electrolysis to convert the metal sulfates to metal sponge and sulfuric acid. Filtration can be performed on higher concentrations of sulfuric using polycloth or glass frit filters. Alternative methods include using Ca or Ba nitrates to convert the remaining sulfuric to nitric acid after the majority of the base metals are removed thru crystallization of their sulfates and filtering the white solid sulfate. The nitrates in solution are then distilled out as nitric acid or used in solution after concentration and or crystallization of the nitrates as desired. Once you have crystallization of base metal sulfates or nitrates these should be dried, weighed, and used as new sources of sulfuric acid and nitric acid. Sulfate recycling in the above processes is continuous with losses occurring during filtrations. When recycling nitrates the nitrate souce must be replenished after each cycle as NOx is a volatile gas which is lost during the use of the acid formed. The art of left over solution recycling is not that complicated if you pay attention to what ions you put into solution and keep like ions together in wastes.
@@lazersteve Thank you for such an elaborated answer. It sounds very complicated to not bother in most cases, but as a matter of principle it is nice to know that the purification could be done.
@@bormisha it's no more complicated than any other salt chemistry. Key points to know are solubilities of the various salts, ions present, and which ion combinations precipitate which salt. Temperature plays an important role in these parameters as with any chemical reaction. I usually convert my alkali sulfates to nitrates then use the dissolved nitrate as a solution in my refining work forming nitric acid in situ.
It's great you sharing your vast knowledge with all that would like to learn. For me. I most likely will never use this knowledge you represent in your video's. But just having the opportunity to see these things in action is great. I never had the opportunity to go to much higher learning institutions, so RUclips was really it for me, and man the things I've seen. My eyes were opened and my mind expanded way beyond what would've been if these platforms didn't exist. Thank you again for sharing your knowledge with me. I do hope you can continue the program.
return of the king
No need for Pt electrode, lead metal will work just fine (only in sulfuric acid media of course) !
I mean lead anode.
Indeed. Note: put a bag over it, the PbO2 that grows on the electrode tends to swell and slough off from time to time!
I think NurdRage's point was to be as non-toxic and environmentally friendly as possible.
@@ropersonline Lead is not going to be consumed at all, look how lead acid batteries work, electrodes stand for decade in such environment. Only small amount s of lead dioxide is expected to pile off over time and even that is in insoluble form.
@@papanyanz yeah but lead sulfate is soluble and lethal if touched or inhaled
I do precious-metals recovery. And I have learnt so much from your show, I really appreciate what you have done. You are very intelligent man
Just want to say your wisdom has been infinitely helpful... These tips you mention along the way... Beautiful.
"Complicated topic for another time" I eagerly await that video.
I’ve learnt so much from you.....Thankyou your content is purely Awesome.
I wish I knew it few kilograms of silver recovery ago :D
Oh man, there is a whole world of precious metal youtube out there. Sreetips is so interesting to watch him dissolve metals, and then get super high purity metals.
@Eric Konschuh He's very selective about how much nitric he uses, so he doesn't end up with much excess in most cases.
@@andybaldman Even so, recovered nitric acid means less money spent buying new. That adds up in the long run.
@@vinnycordeiro If you watch sreetips's videos, you'll see the techniques he uses to make sure he has little to no excess. And then he reuses any waste he has in other processes. And any waste he has after that, he treats and discards. It's a pretty efficient system. He's done videos on all of it, you should check them out if you haven't.
@@andybaldman I do watch Mr. Sreetips' videos.
I do acknowledge that he uses a small dosage of nitric acid to avoid unnecessary usage.
Even so, he IS expending nitric acid, and what this video proposes is the reverse process: recovering the nitric acid originally used to dissolve the base metals (mostly copper). He just need to remove all the precious metals, mostly will be silver, and then apply this video's method to recover the nitric acid. And because it is diluted, he can just use it to dissolve more silver. It's a virtuous cycle.
Also: at least in the US, sulfuric acid is cheaper than nitric acid. And because Mr. Sreetips doesn't see the point of recovering copper, as said in some videos and many comments, he can skip the sulfuric acid recovery, just neutralizing it and properly disposing the neutralized acid and the copper sulfate.
The point being: in his current workflow, Mr. Sreetips is just throwing away nitric acid that could be recycled.
Also: remember that Mr. Sreetips always says he's just an amateur, refining precious metals is his hobby. Nurdrage have a PhD. in chemistry, it's his job. And the professional acknowledged that he didn't knew something and was willing to share his knowledge. A hobbyist can learn this and use if desired.
@@vinnycordeiro Where in his process does he end up with excess nitric?
Made my day to see
This is a great video. Considering that dilute nitric acid is fine for a number of refining processes, it might not even be necessary to concentrate it further. Considering that nitric acid is by far the most expensive chemical used for basic gold refining, getting a fair amount of it back using equipment most would already have (well maybe they'd need to pick up a condenser) is pretty useful.
I salvage gold, silver, & other metals from elect. And refine them I have seen a prosses using stainless to collect the copper but have not tried it yet frequntly gold and silver are plated on copper even in jullry and flat were I'm still learning and you are one of my resources for how I do thing's I am self towt largely and like chemistry .
Never thought to mention it . just starting to strip gold plating using elict.still looking for ways to refine and recover other metals .
Copper nitrate has the most beautiful blue color. Copper sulfate also is a pretty color.
Agreed, copper is easily my favorite element.
@@T3sl4 Only element whose colors I like more is Bismuth, but that is because that beautiful rainbow sheen is combined with the beautiful geometric patterns.
@@T3sl4 have you seen cobalt or nickle salts and their double saltz
Cool I have a couple gallons sitting on the shelf figuring one day I’ll figure something out to do with it. Thank you!
I would like to see you repeat the thermal decomposition video and this video with actual refining waste. I would even send you a jug of it just to see how this would work with waste products and any contamination they may contain.
Yay ! Super useful chemistry for the GRF guys !
You deserve more bananas my friend.
@aga: for refining copper based scrap purposes there is no need to distill off the nitric acid; simply cool the copper sulfate/nitrate mixture to crystallize out the bulk of the copper sulfate and keep repeating the digestion/freezing cycle. A small amount of copper sulfate remains after each cycle, but is limited by it solubility at sub zero freezing temperatures, much like my cold nitric acid recipe. For added strength simply evaporate (no need to distill) off excess water before freezing. I call this my evaporation nitric acid technique...works wonderfully. Of course you can follow NR techniques to recover the nitric for other purposes if thats what your goal is. Steve
@@lazersteve Many thanks for that. Great advice. I only delved into Gold a few times and generated so much toxic waste from e-scrap it took about 3 years to neutralise it all down to safely disposable substances. - more like Waste Treatment Chemistry than any actual gold (or even Fun).
Nurdy shows Many recycling opportunities for you Real refining people, of which this video is an excellent example.
Many people deserve more bananas.
@@aga5897 over the years of my refining I realized that precious metals refining should be viewed as a base metals refining effort, with the precious metals being a valuable by product of the continuous cycle.
@@lazersteve Awesome ! Absolutely Awesome !
Yes yes, I'm going to sleep in a moment. Just one Nurd video... Or better five.
I have heard that bubbling nitrogen dioxide through 3% hydrogen peroxide works very well.
Also, reducing the copper FIRST with iron yields metallic copper and iron nitrate, which decomposes at a much lower temperature that copper nitrate: only 80C, well below water's boiling point. Your waste afterward is just iron oxide mud, which is totally nontoxic,
Interesting, btw I wonder if only copper is depositing on iron, does the mud made of iron oxide contain any other metals from ewaste solution?
Interesting that it gets a spongy texture once the Cu concentration drops. I see a similar texture in metal sulphides in the rocks I study and was advising wondering if it was due to a drop in metal saturation in the mineralising fluids towards the end of deposition.
wonderful information - loved the video
Great video, been looking to solve this exact problem!
This is immensely useful information for those of us getting into precious metal recovery and trying to plan ahead to minimize wastes.
Dude! I hadn't thought of doing this but it's so elegant of a solution! I just so happen to have some copper nitrate waste and now I know exactly how I am going to process it. Thank you! :)
Would be interesting to see what a large scale set up would look like.
That's very helpful thank you .
Thanks NurdRage
Are you going to do a video to recover the rest of the metal waste after the copper plating?
Great job and video
lead annode works good too in my exp
it possible to roast iron chloride in a saucepan and distill chlorine gas to make chloric acid instead of electrolysis? and what temperature is needed for that,
I ask you to depict the experience for us in a video. We are your followers and we learned a lot from you. Thank you.
If you have a lot of copper oxide powder, it's easy to smelt.
Just mix in finely powdered carbon in excess and hit it with a reducing flame. Same as reducing lead oxide to metallic lead.
It works so well, I was even able to get reduction in my first experiment with a steel spoon filled with carbon-copper oxide over a hot candle flame. Ended up with clean, red copper metal powder that polished up when rubbed between two smooth stainless steel surfaces (which is how I test powders to see if they're metal or not. If they take a polish, it's at least partly metallic. If not, it's mostly salts and oxides.)
i totally
Thank you I had been just adding iron to my copper nitrate waste and waiting for the copper to settle out loosing my nitric acid. I have several 5 gallon buckets of copper nitrate waste so I know what i am going to be busy over the next few weeks.
Good morning.
Can you just distill the sulfuric acid to get rid of contaminants? It doesn't look like there should be anything volatile there.
absolutely! but it's REALLY hard to distill sulfuric acid. also the acid is still depleted as it accumulates metal sulfates, so you're still going to need to top up with fresh acid on occasion, thankfully it's not too hard to do.
@@NurdRage hello I want to ask about ion exchange separation membrane for potassium and sodium for example
@@megahaker7712 3M sells membranes for that sort of thing. They are expensive, but reusable.
@@NurdRage And for that matter, once you're up at those temperatures, and transition metals get involved, their sulfates all(?) decompose to SO3 -- nasty!
@Mega Haker,
Potassium tetraphenylborate is a salt with the formula KB((C6H5)4). It is a colourless salt that is a rare example of a water-insoluble salt of potassium
Or potassium aluminosilicate
KAlSiO4 (water insoluble)
poly(sodium styrene sulfonate)
Also Potassium tartrate, if the pH didn’t decompose it
Excellent video.. thank you!
I'm working on a project to turn about 18kg of mixed scrap of unknown alloy bronzes, into a 25 to 30cm diameter bell of 80Cu/20Sn bell bronze. I doubt that any Ag/Au/PGM are present, but I want to remove any Mn, Si, Zn, or Pb present, and I'd like to separate out the tin, recover it, and supplement it with additional tin in the final melt.
It looks like a dilute nitric acid (a lot of it..) will dissolve the bronze - all the possible components except for the tin, which will either settle out as a tin sludge or precipitate as an insoluble tin salt, either way, I think I can extract the tin in the first step by filtering it out.
Then, I can use this video method to recover the nitric and leave all the metals as sulfates in solution.. if something (maybe lead sulfate?) precipitates, a filter catches that.
With "copper etc.." sulfate, I hope to reduce all the metal salts to finely divided metal particles, but I'm not sure which reagent to use.. maybe iron(II) sulfate.
Then, hopefully, either hydrochloric or sulfuric acid will put the contaminant metals in solution without taking too much of the copper powder, so I can capture purified (if not quite "pure") copper in a filter.
The next step (maybe this is optional..) seems to be putting the copper filtrate into solution as copper sulfate (process TBD..) and electrowinning out the copper. Then, wash/dry/weigh the copper, add 1 unit tin for each 4 units copper by weight, melt, pour, cast and mechanically finish the bell.
Does it seem like I'm on the right track, or have I made an obvious mistake somewhere?
And, dear Internet.. yes, I know.. "just buy a bell".. sell the metal I have as scrap for $2.50/lb - $75, then pay $10+/lb ($300) for new metal to alloy & cast myself.. or pay closer to $450 for an 8.5" bell. Making it myself saves me a little money, but gives much greater satisfaction.
WHAT - some people actually DO the things suggested in these videos? i just watch them cause i like chemistry - but purely theoretically, would never think of doing it as a real-life hobby :-D
This blue'ness @ 1:50. ☺️ Awesome. 😍
This is efficient and simple I like it
I think I heard Will Smith in the distance saying something about the adiabatic properties of this video. I suspect that the next big craze will be to put down the bleach, iodine and cyanide, and look up how to trickle-produce nitric acid via the Birkeland-Eyde process. Sadly, the information on that is scarcely available.
From an amateur precious metals refiner, thank you for the video!
The platinum electrode can be replaced with carbon rots. They will be eaten away very very slowly by the oxygen, but it will not harm the reaction. And they are cheaper than platinum electrodes.
In nitric acid solution/metal nitrate recovery, you can use lead instead of platinum.
Like the carbon rods, the lead does degrade with use, however, it's oxides are easily entrapped to prevent contamination of the copper.
By the way, sulfate ions tend to intercalate a graphite anode and exfoliate it into few-layer-graphene
Dr. n-BuLi,
I'm not sure if you are aware of the use of copper in chemical refining of precious metals. Contamination should not be an issue with the solution. Copper is used for inquartation. The metals are melted down int an alloy so that the silver atoms are much more spread out and no copper can be trapped inside a pocket of silver where the acid can't react with it.
This is also done in gold recovery, only it is silver being added to gold.
You seem to have a knack for electrochemistry. Can you demonstrate making solid Mg/Ca carbonate (or one of its precursors like CaO or CaOH) from feldspars or silicate minerals using water or sea water? We will need negative emissions to stay below 1.5C warming. There's a paper: "Direct electrolytic dissolution of silicate minerals for air CO2 mitigation and carbon-negative H2 production" by Rau et al but I think the concept can be taken further.
Could you use mixed metal oxide instead of a platinum electrode?
"Do what you oughta - add Acid to Watah" -- thank you Julius Sumner Miller
Julius Caesar Salad
lead makes a good anode also
Awesome video I’m probably going to use this technique to recycle my nitric acid from my silver refining.
I used a MMO anode for this. It worked, but I think the anode slowly degraded. It's still nice and black, but who knows...
The copper electrolysis with copper sulfate could be use for copper plating, replacing the platinum electrode for some copper and the actual copper for the thing to be plated?
Can we do electrolysis of copper nitrate solution ?
I have been binge watching sreetips doing metal refining and I always wince at all the toxic gas it produces during inquartation and was wondering if it is possible to easily capture that gas to make pure nitric acid. When you dissolve the reddish NO2 gas into water, is that nitric acid??
I hope you some day may be do whole series of all impurities cleaning process from any liquid form. Meaning most used preferred, so example there is little to no use remove astatine or radioactive elements cause there is almost none of them in commercial products, but all solids that may be in solution like most of the metals, post transaction metals and non metals solids. Its interesting to think process that you can take all of these in good use just knowing how to.
great !
That was hella awesome
Would love to see you recover the base metals as well
(Seriously not sure why im so enamoured by metal based chemistry when i am a molecular biologist)
The good thing is expanding your interest is other fields can suggest unconventional approaches to unsolved questions in your own field
Hi NurdRage .cool video.how can I separate the copper zinc and tin from brass? I want learn more about this process?
Thanks
Noor
One question, at what temperature is nitric acid distilled?
Could you use a carbon rod instead of the platinum electrode? Would probably not survive as long, but I would expect it to work. And it is cheaper.
it might degrade quickly, lead dioxide or platinum is suggested
That company’s bottom line just improved significantly.... xmas bonuses are back on.
Hi NR. Would this be feasible on an industrial scale? I imagine the energy bill could be high.
This is basically what chip fabs do. That copper waste is very valuable.
I was under the impression that titanium is electrochemically inert?
Which is why anode cages and auxiliary anodes for electroplating are made from Ti?
Is platinum _really_ necessary?
So it seems that standard titanium will resist corrosion in pure sulfuric acid up to 20% at 0C and 5% at 25C. In the presence of ferric or cupric ions, Ti will resist 20% at room temperature. This suits my needs perfectly (making high throw electroplating solution). It's illegal for me to posses sulfuric over 15% without an EPP licence anyway.
No, that doesnt work. The passivation layer is too resistive. I can't get current densities higher than about 1mA/cm2.
Graphite works, but is consumed at an uneconomical rate, and turns to dust that gets bound up in the plated out copper.
I'm going to try one of those impossibly cheap electrodes.
Well, that one was amazing . Wondered about some of this. Keep going. 👌👍👏👏👏👌👍
thank you very much for this video. May I ask how many percent nitric acid is recovered after distillation of copper nitrate and sulfuric acid? Will it produce 10% nitric acid or more cause I just need 10% nitric acid.
what happens if you have glycerin in your copper nitrate ? from washing/ cleaning circuit boards...
Can you please give some idea how to remove the contaminants (base metals) from the sulfuric acid? Thank you!
Distillation is probably the most practical way, but distilling sulfuric acid is pretty dangerous, so be sure to use reliable equipment and take all safety precautions extremely seriously.
Aren't platinum electrodes like hella expensive???
this video worked out great for me thanks but.... the first time I did it I used a lead oxide anode ... worked fine. the second time (2 liters of copper sulfate) I did it I used a Palladium plated Rhodium anode( 2volts 0.8amps), I fell a sleep and when I woke up.... the copper came out of the solution but the anode started to dissolve into the solution and now it's dark blue. I have no Idea what is in the solution. I tried copper, zinc, aluminum and tin to see if there would be any displacement... no reaction. I took some of the solution and tried to reverse the process using the lead oxide anode... the lead oxide anode was destroyed. other then sending a sample to be analyzed, is there anyway to fine out what is in the solution to get it out? Because I don't know what it is.... it will cost me a lot to dispose of it because I'm not going to just dump it. I will make a nice donation to your channel if you help. thanks
to get all materials, not buy anything, try carbon furnace resistance furnace molten electrolysis of random sand or salt water
In the beginning it says wear gloves... Make sure they are rubber and normal painters gloves... Because they will otherwise ignite lol
Could you produce the copper and nitric acid directly if you used a cation exchange membrane to prevent the nitric acid from reacting with the produced copper metal?
Sir i have problem in extraction of copper metal from my waste nitrate solution,
When i add iron plate to my nitrate solution iron hydroxide is precipitated instead of copper metal, why this happened and how to avoid it?
reminds me of nitric acid synthesis with potassium nitrate and sulfuric acid (minus the electrowinning)
What a legend.
This channel deserves a million subs.
I think im going to blitz social media this week and try to make it happen.
Gudluck kid
@@cosmicrider5898 i was liking your comments kido:)
Can this done with a Graphite Anode instead of Pt/Ti?
Flat screens and touch screens are made with gulley am I believe I have not figured out how to recover it yet .
Maan I've been wondering how to do this for ages. Now how to seperate my aluminum and HCl...lol
In somewhat similar way: precipitate aluminum phosphate with phosphoric acid and distill off HCl. Then you might try to electrolyze Al from melted Al phosphate ;). Or just precipitate Al hydroxide.
Hmm there a way to recover nickel at all? Kinda thinking of getting copper and nickel for making mokume gane....
Great video! Its cool to think how many people this will actually help
Can graphite electrode be used instead of platinum?
sorry no, graphite will get destroyed pretty easily under these conditions
HI
Very informative video
I wanted to clarify my doubt
What will evaporate 1st Nitric acid or Water
I googled and found nitric acid boiling point is 83 C
Regards
Water will boil first because nitric acid forms 68% azeotrope with water which boils at 120 degrees Celvius
Did anyone mention / ask about HCL remaining in the waste copper nitrate solution? Many refiners use HCL to precipitate the silver chloride. Would this have any adverse effects on the sulfuric acid -> distillation of the nitric acid? While the boiling point of HCL is higher than Nitric, i'm not sure about azeotropes or if any HCL would remain in the final distillate.
I have about 20 liters of a copper leach consisting of HCl and H2O2 used to remove gold foils from gold plated computer parts. Can this process be used to recover the Hydrochloric acid and the copper. I know that the solution will also hold Ni.
probably yes, but hcl isn't really worth getting re-cycled, 10 dollars at home depot for 5 gallons (20%)
Hi!
My solution doesnt end as Nitric Acid, im doing all the steps (I have tons of Copper Nitrate and Sulfuric Acid), they do precipitate, but when i boiled them the result doesnt transform in Nitric Acid (Sorry for bad English, its my second language), Any suggestions?
Hey Nurdrage, there's an interesting reaction Im trying to figure out. Involves plating copper onto aluminum. It's in a hackaday article called Soldering on aluminum. Using ferric chloride, copper sulphate and salt somehow causes the copper to bond onto aluminum. I think there is somehow etching going on, iron is somehow deposited and then copper binds to the iron. might be an interesting video.
copper sulfate would likely react with aluminium to produce copper and aluminum sulfate.
What would happen if there was trace chlorides in the waste? Often my nitrate waste contains a small amount of HCl or NaCl used to drop silver chloride. I dont find the displacement by copper type of process you mention reliable.
if it's just a trace then nothing serious. The chloride will be converted to chlorine gas and nitrosyl chloride by the nitric acid produced and will bubble out and into the air during distillation. This is why you should do this outside or in a fume hood. You'll get pure chloride free nitric acid.
great video .but i have a question .if you put silver and copper and dissolve it in nitric acid .if you add HCL you will get silver chloride .and the liquid will be then aquarejia .can we do this method to get back nitric acid
You will need to remove the chloride from the solution first. This can be accomplished by adding a soluble nitrate that forms an insoluble chloride with any chlorine in the solution. Silver nitrate comes to mind as a viable chlorine scavenger. A slight excess should be used (no more AgCl is formed when AgNO3 is added). Be sure to filter out the silver chloride formed and then add more solid copper to cement out and collect the excess silver as described in this video.
Ir-Ta MMO electrodes are better than Pt for this.
Don’t use fractional distillation to purify the nitric acid. Add ammonia hydroxide to the dilute acid and boil it down. Get the ammonia nitrate and add sulfuric acid. You can distill that down for 98% acid.
but that wastes ammonia and sulfuric acid. Fractional distillation wastes nothing except electricity and time. I have a whole video on it.
Excellent video, thank you nurd rage. Now I can clean up my wastes and recover usable acid and scrap copper
What about using a lead/lead dioxide anode? If you connect a piece of lead sheet to the anode of your electricity supply and insert the lead after(!) the copper cathode has already been wired up and inserted into the electrolysis cell, then no lead should dissolve but rather coat with PbO2 straight away.
Just a thought to avoid the expensive platinum anode... .
I was sold 24k gold but it was 23k. I now have copper contaminated cloroauric acid. How do I get the copper out so I can use it in a plating solution?
Precipitate the gold with sodium meta bisulphate to get your pure gold and then redisolve the pure gold?
Yeah I was trying to recover some e-waste precious metals and I ended up letting the solution dry up and turned into a clumpy clay block of mess. I had it in a glass mason jar and the and it ended up breaking so I swept up the bluish whitish clump of mess and put it into a metal coffee can and it sat for about a year-and-a-half two years.
I recently pulled it out and re-added some vinegar 16% and 3% hydrogen peroxide the solution turn dark blue like I see in your video the only difference is I have three layers of sediment on the bottom, that are three different colors what could those three layers be and what do I do with them?
great video, and fantastic insight to recycling re-usable materials. is there a forum to ask questions and solve issues with this experiment?
Very nice procedure. This procedure can be used also for dirty solutions of nitrates? For example when I have PCB waste... there can be trace of Fe, Ni, Au, Ag, Sn. Precious metals can be recoverd by cementing with Cu, but still there is a reminder Ni, Fe, Sn, ... ? How strong is HNO3? about 20-30% is achieveable with such distillation?
as long as the precious metals are cemented out with Cu. The remaining ones won't be an issue. The nitric acid concentration is variable (since wastes are variable), but i have a video on my channel how to purify nitric acid so you should be able to upgrade any type of nitric acid.
@@NurdRage one question, why would precious metals interfere with the reaction?