Gold Recovery with Reverse Electroplating - Part 1 Gold Stripping 

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@@BP-ko3bp Hi, what do you mean by salt water, please?

Wow! Great content!!!

Hi, reverse electroplating is a slow process. For me it best works for layers of gold up to 5 microns as process is relatively fast and effective. The thicker the gold layer the more time you wait and for gold filled should be very slow. Gold is in solution as colloid gold suspension, that’s correct. If you boil the acid after completing the process gold will aggregate in pretty big pieces.

Hello, sulphuric acid is 98%, normal glass, room temperature. Did not noticeably increase during the reaction.

Yes, it is coming tomorrow 😃 Material was not a lot, and part of it really thin gold plated, so not that much: 0.27 g.

Hi, concentrated sulphuric acid is absorbing water from the air and concentration is dropping with time.

@@escrapchannel Thank you!👍👍

Welcome!

@@escrapchannel Brother...What a experience!!! I just performed my first reverse electroplating! Absolutely incredible! I have almost 5 pounds of plated material processed! I did almost have a accident. I was dipping a piece and I noticed a drop of sweat getting ready to drop from my glove into the acid. That would've been a problem! Correct? Thank you so much for the knowledge of this method. Works great!!! I'll let you know the outcome.

👍

@@gregdickson5107 Hi, electrolyte should be concentrated sulphuric acid. If you have water in the acid it will eat the copper as happened.

@@escrapchannel I got it from a friend and it is supposed to be 98% but It is old so perhaps it has absorbed some water. Is there a way to test this? Alternatively how about using stainless on both sides as the cage is only really conducting the electricity after all.

@@gregdickson5107 Hi, long time ago I tested different materials for the basket and stainless did not work. It was destroyed in the cell. Copper is inert in concentrated sulphuric acid and not reacting. Sulphuric acid is dense and one option to check percentage is to check density. Measure weight and volume and calculate it. No option to buy concentrated acid?

@@escrapchannel Thanks it looks like my sulphric acid was not as concentrated as I thought. Also as I didn't watch it constantly I think the current went really high and with that the temperature. High temperature makes the copper react with the sulphuric acid. After a few more tries were I also restricted the current so the watts stayed around 6 the temperature stayed nice and low and the basket came out fine. I have learned a lot this week. Thanks for your help.

@@gregdickson5107 You are welcome!

Best material for the mesh is brass or copper. They are stable in concentrated sulphuric acid. Cell is slowly heated by the reverse electroplating. Heat is not helping, so in larger scale cells are cooled during work.

96% серная кослота, не менше

Thanks!

Hi, I do not directly melt the gold collected from the cell. After separating the residue I go through aqua Regia dissolving and reduction of gold. This purifies the gold after reverse electroplating.

Hi, yes. Brass stays intact in concentrated sulphuric acid.

@@escrapchannel Thankyou so much. It is the most informative video on this process that i have seen. Can the sulphuric acid be less than 96%?

Hi, as concentrated is considered 96%. As sulphuric acid absorbs water from air concentration is dropping constantly. When diluted sulphuric acid starts reacting with metals, so I would try object without value before using method for something expensive to strip gold from.

@@escrapchannel thankyou. one last question. would i still use stainless steel anode or use a different metal anode when stripping from brass?

@@HelloElegant-n4e Stainless steel is working for stripping gold from brass for sure.

Hi, cathode can be different, but I find stainless steel as perfect. Not reacting, practically inert and easy to remove the coloidal gold when deposited on top.

Hi, it will work. I’ve never tried but there are videos on internet showing the process.

thanks for the reply sir

Hi, for me 5V is an acceptable speed/purity voltage. As I process the product further in aqua regia I did not directly melt the cell product to check purity. The good think at 5V is that it is low enough to avoid foam and other nasty effects that start if you further increase voltage.

Close ... Bulgarian :)

Hi, reading your email I count the methods I know and yes, there are gold stripping agents like ecogoldex, with gold cementation with zinc afterwards. But such methods are slow for the plated watches cases.

​@@escrapchannelTy, but i have only 1kg of soviet and unfukcional watches this is very expensive for this. TY❤

@@GOLD9ii Hi, I never tried what I will write here but I remember citric acid reacts well with copper, so if you chop watches cases in pieces and put multiple times in citric acid you may end up with gold foils after some time. Will not be quick. Gold foils will not be 24k but somewhere between 10-16k it may come out.

​@@escrapchannel❤ u are my god TY

Thanks!

Thanks!

Thank you!

Hi, I use voltcraft.

@@arismakim703 Hi, if possible to use English, please.

@@escrapchannel Isn't copper insoluble in sulfuric acid?

@@arismakim703 Hi, if sulphuric acid is concentrated - copper will not be dissolved. Diluted sulphuric acid will dissolve copper.

@@escrapchannel thank-you 💞

Thanks! My metrics are pathetic 😃

eScrap Channel you’ve been gaining subs faster than most!

Really? So, it is not that bad? Thank you! Trying to focus mostly on the videos!

@@escrapchannel your channel is most excellent and I'm going to let people know in my next video!

Roe Mantic: Thank you!

Just be extra careful with concentrated sulphuric acid. Best approach to coagulate gold is to heat concentrated acid almost to moulding for a while. Then is easy to separate. 👍

@@escrapchannel Oh I have learned to be very careful. Thank you so much for your time. I will let you know the outcome.

@@JustJeff62 👍

@@escrapchannel Hello once again my friend. Is the stainless steel electrode magnetic stainless or is non magnetic? Thank you for your time.

Hi, The one I use in the video was in non magnetic.

Thanks!

Welcome!

Thanks!

Decided to spend some time in the lab this Saturday :)