So far I've learned something from every video I've watched. Have a GREAT Day!!!

I watch your videos so frequently to try and resolve my gold dropping your my hero thanks Tim from Australia Vic

The latest in a series of well put together videos. Very informative. I like the idea of using an existing button as an indicator!

@successfulengineer

7 жыл бұрын

Thanks for the positive comment, very happy that my videos can help / entertain fellow enthusiasts!

Great Video, ty so much for all the help, it's amazing the small things that help along the process more smoothly. Not to mention the money you save on all the chemicals you use. :) Saving me a fortune here. :)

@successfulengineer

6 жыл бұрын

snoozin99 Thanks for the comment mate, appreciate you taking the time. Feel free to ask if there is ever anything not quite clear enough.

Great video man, very informative. Thanks for sharing, looking forward to the next one :) Take care, Chris

video was extremely helpful and so here I am thanking you again. have used it twice, one was good and the other one I had to start over

@successfulengineer

7 жыл бұрын

Yeah, that was pretty much my experience too until it clicked in my mind that you need to visualize what's happening with a gold button. No problems since then.

Nice method to not overshoot. Thanks for sharing 👍

Thanks a good info video , ive used loads of metabisufate in the past but now ive sent for sulfamic acid , and hopefully use a lot less keep em coming

@successfulengineer

4 жыл бұрын

Yep, works great and as side-effect it also gives you some Sulfuric acid which precipitates any lead. Thanks for the comment.

GOOD LITTLE VIDEO THANKS FOR TAKING THE TIME AND PATIENCE TO DO IT VERY HELPFULL ,AS MY FLARE UPS ON NITRIC ARE FIERCE , AND TO ADJUST EVEN WHEN USING INCRAMENTAL NITRIC ADDITIONS IS ALWAYS A PROBLEM ,,,NOT ANY MORE THANKS AGAIN KEITH UK

@successfulengineer

4 жыл бұрын

Hi Keith, thanks for the comment, yeah, once you get the hang of Sulfamic acid you will never look back!

Thank you for this very clear information’s.

where do you get your sulphamic acid from. im in cape town and finding it hard to get.

Please guide me in this. Can i use sulphamic powder instead of liquid?

Could you send me a whole details about the quantity and so on.

Correct me if I'm wrong : HNO3 + H3NSO3 → H2SO4 + N2O + H2O (nitric acid is turned into sulfuric acid). And indeed, lead will be precipitated by sulfuric acid. If you refine gold from PCBs or other electronic waste, it may be useful to have a first bath with either acetic or oxalic or citric acid (with a little squirt of nitric acid) to remove Sn, Pb, Zn (components of soldering).

@successfulengineer

2 жыл бұрын

Looks correct to me, and yes, you definitely end up with Sulfuric acid and precipitated lead.

@SunnyKetPatil

Жыл бұрын

Yes

Sorry I am confused. Is sulfamic acid the same as sulphuric acid? And if so I can use that to precipitate gold from AR? Instead of SMB. Or which one is preferred?

@successfulengineer

2 жыл бұрын

Hi there, no, they are completely different chemicals used for different purposes, the confusion might come from me saying that Sulfamic acid reacts with Nitric acid to form Sulfuric acid, which will precipitate Lead from the solution.

I acquired land with very old tailings, last time touched was 125 years ago. Also found their foundry area, alot of slag[grey,green,black,brown&blue]. Time and weather has covered alot of it. Dug down 2 feet found stacked stone walls. If slag i ground fine in my ball mill, then run across shaker table, you find tiny gold and silver specks and some lead. I am using sodium cyanide to dissolve the pm's. 3 Assay reports close to each other Au,Ag,Ir,Pd,Pt,Rh& Ru. Cyan. Ph 11, 60 gram cy per 10 liters water, air, mix for 24 hrs, filter add 5-6 gm cy, so have free cy, precip. with zinc powder, filter, rinse, put precip in hot Nitric/water, filter, rinse, air dry. I torch melted, 36.7 gm 14k&plat.. From 10 -5 gallon buckets of ore. The exchange does not accept the metals mixed. I came back flattened the button, cut up put in AR....This is where I am at now. My plan is to denox, zinc precip. take this into hot ammonia to dissolve the plat. into liquid, filter. This should give me my gold? To the plat. liquid filter it through steel wool, then put that into HCl hot to dissolve the steel wool leaving plat.. I have tried ammonium chloride, did not work. I was told because of the other pgm's. I also have tried denox down, add HCl twice, SMB, nothing. Was told because of the pgm's in solution. So I figured next batch. Zinc precip. from cyan. put this into sulfuric/water warm, pour off rinse, solids then into Nitric/water warm, pour off, rinse, solids now into AR room temp, denox[with sulfamic], zinc precip., filter, rinse with HCl, remaining solids put into hot ammonia, filter rinse and melt the solids. Is this all correct? Will the ammonia work? Use the other acids to remove all base metals and pgm's, leaving the gold by itself. Thank you for your time. Joe

@successfulengineer

5 жыл бұрын

Hi Joe, I honestly have almost no experience with PGMs, so unfortunately cannot offer much advice! Have you tried asking for advice on the Gold Refining Forum ?

@1hardman161

5 жыл бұрын

@@successfulengineer thanks and yes also on 911 metallurgist. People take to long to answer

If i dont use enough sulfamic acid to avoid overdousing can i still overwhelmed with smb to precipitate? Assuming it doesnt denox properly?

@successfulengineer

2 ай бұрын

Yes, you can also add some water which helps, but really, try to use the minimum amount of HNO3 you can, it just makes everything so much easier.

Hi....i used to drop the gold using Iron(II) sulfate. can i use sulfamic for denoxxing the AR before drop the Iron(II) sulfate solution?

@successfulengineer

4 жыл бұрын

Hi Bas, yes, no problem or interaction between the sulfamic and Copperas as far as I know

What should one do if I added too much sulfamic acid? I’ve used too much and have that shiny drop along with regular gold powder? I’m planning on refining it all again but interested in what happens and how to fix the gold powder? Thanks for sharing, very very helpful

@successfulengineer

6 жыл бұрын

Hi Robert, best bet would be to drop out any Gold still in solution, use Copper to cement on if you have to. Then wash the settled powder a few times with boiling water to remove as much of the Sulfamic acid as possible before re-refining. If you don't wash the Sulfamic out, it will end up fighting with your Nitric acid additions and you will end up using too much Nitric again ! (I've made this mistake too :) ) Good luck and let me know how you go.

@robertbailey9242

6 жыл бұрын

Successful Engineer thank you

Hi sir Is Ascorbic acid better to prspitat gold Or what I use it but powder is not gold its brown color Thank you

@successfulengineer

3 жыл бұрын

I hope you know that Gold precipitated from a solution is brown, it is NOT Gold coloured. I prefer to use Sodium Metabisulfite for precipitation, but have heard other have good results with Ascorbic acid too.

hello.i think I done what u mentioned at the start of the video.fist time using sulphamic acid.i think I added to much.i got a precipitate n bottom f beaker.looks like salt and pepper mixed together for all the world.how would I proceed then.would I just filter the liquid.anuthing that i get it the filter.put it back in the beaker with AR redisolved the gold again.i tested the liquid after input sulphamic acid and stannis was negative.i must of used way to much sulphamic

@successfulengineer

3 жыл бұрын

Hi there, what I would do: Step 1 - Take the liquid that you believe has no more Gold in it, heat it mildly with a Copper bar in there, if there is any remaining Gold it will cement out on the Copper. You should have already neutrlized all the HNO3, so there shouldn't be much Copper dissolving. Then I would take all the solids, and wash it many times with boiling water to get as much as possible of the Sulfamic acid out, otherwise, re-dissolving with HNO3 will be slow because the Sulfamic will keep reacting with it. Once the solids are well washed, re-dissolve with AR.

@davidbarron107

3 жыл бұрын

@@successfulengineer thanks so much for your reply.ill let you know how I get on.thanks a million

@successfulengineer

3 жыл бұрын

@@davidbarron107 No worries, always happy to help. Be safe, work methodically. Nothing is lost. Get in touch if you get stuck somewhere.

Where did you get your sulfamic acid from in NZ?

@successfulengineer

6 жыл бұрын

Hi Luke, you can buy it in small quantities for a reasonable price from mygoodhealth.co.nz

@royalrefining6182

6 жыл бұрын

Successful Engineer oh awesome what a good little site that is. And cheap too. I have just been schooled about urea and the compounds it can make when using it to denoxx or neutralize a solution in PM recovery...im making the switch and saving my H2SO4 for other things instead of dropping lead which is another bonus to using sulphamic

@successfulengineer

6 жыл бұрын

For sure, the Sulfamic works great, just ensure the solution is hot! and give it time to work. And obviously try to have as little free HNO3 to start with as you can. The reaction can be quite violent if you have lots of excess HNO3, so make sure you are protected from a boil over too.

@royalrefining6182

6 жыл бұрын

Successful Engineer will do. I try to keep acid use to a minimal. Catch pan is a must, I've definitely learned my lesson in the past with boil overs 😅 it's a hard lesson too...

I put way too much in. It's that going to mess things up? If so how do I fix it?

@successfulengineer

2 жыл бұрын

Hi, yes, putting too much can certainly cause problems, I would probably dilute with boiling water till all loose crystals are dissolved, then cement any Gold in the solution out on Copper, then re-refine

And.., compare to Urea, is this a better to use sulfumic acid to neutralize nitric?

@successfulengineer

6 жыл бұрын

Yes, Sulfamic acid is better because it converts the Nitric acid to Sulfuric acid, which has the added benefit of precipitating any lead in solution. But Urea definitely also works fine

@panikrev175

6 жыл бұрын

Successful Engineer Urea only kills the Nitrogen Dioxide , which stops generation of more nitric acid in solution. You must then neutralize the remaining nitrates in solution, which is why sulphamic acid is the better option.

Yet another nice informative video from you, I'll be using this method for sure, Only one question, I have a product called Sulfamic acid cleaner in granular form that's used for cleaning tiles, I'm wondering if this is the proper stuff to use, thanks a lot bud.

@successfulengineer

7 жыл бұрын

Hey there, yep, that is the stuff. I believe it is sold in some countries as 'grout cleaner' or tile cleaner. You can test it before adding it to a gold solution by just mixing some nitric acid into water, then add Sulfamic acid. Initially you should see a energetic reaction, which will decrease as the Nitric is converted. Make sure you have the solution hot when adding the Sulfamic, I don't think there is much reaction if you do it cold. Thanks for your comment and be safe :)

@iamtheman240

7 жыл бұрын

Successful Engineer Hey thanks, so now where does the tin and metal go that the sulphuric acid cleans up, does it drop out as sediment that's caught when filtering the gold solution or does it just not drop out when doing the gold drop? Thanks

@successfulengineer

7 жыл бұрын

The Sulfuric acid makes any lead in the solution precipitate as a white powder which will settle on the bottom over a day or so. By the time you have gold in solution, there should be no more tin in solution (SC) otherwise you will end up with colloidal gold.

@iamtheman240

7 жыл бұрын

Successful Engineer thanks again my friend, you helped clear up the problems I've been having at this stage, best regards; Andy

@jay8980

2 жыл бұрын

sulfamic acid naturally occurs sand-looking, but with water you can make it a liquid as well as dilute the strength

Does it have the same effect when high levels of chlorine are present?

@successfulengineer

3 жыл бұрын

Not as far as I know, the Sulfamic acid has a chemical reaction with HNO3, not sure what the results would be with Chlorine.

@gabrielheredia7563

3 жыл бұрын

Could we get more denooxxing videos. What difference in performance if solution is cold or warm. Thank you.

@successfulengineer

3 жыл бұрын

@@gabrielheredia7563 Hi there, with Sulfamic acid, the solution must be very hot, I believe that it is less effective with cold solutions. I am unfortunately not doing much Gold recovery anymore, have moved onto some other projects. But still happy to answer any questions if I can help.

@gabrielheredia7563

3 жыл бұрын

@@successfulengineer appreciate your efforts.

Thanks for sharing. If we don have a gold button for indication, keep adding the sulfumic acid till there is no reaction in the solution can? Or is there other metal can replace gold as indicator? Thanks advance.

@successfulengineer

6 жыл бұрын

I guess that Copper will also work as indicator, but will add extra Cu to your solution. It is quite difficult to judge how much Sulfamic to add without the indicator, and you don't really want to add too much!

@khookhoo2956

6 жыл бұрын

Successful Engineer if that so, wont the CU affect the purity of gold? Thank you.

@successfulengineer

6 жыл бұрын

Kepong JUSTICE Kepong JUSTICE I have thought about it some more, Cu is actually not good because it will cement Gold out of solution. If you use SMB to precipitate your Gold then the Copper in solution doesnt hurt too much because the Cu stays in solution. The best way is to use a pure Gold button as indicator. Also try to use the smallest amount of Nitric acid that you can to dissolve the Gold, neutralizing excess Nitric is always difficult.

@successfulengineer

6 жыл бұрын

Kepong JUSTICE Kepong JUSTICE The other option you can do if you have too much Nitric is to deliberately ise a Copper bar to cement all the Gold out of a solution. This way you get a fine black / brown powder and excess Nitric acid doesnt matter, but the Gold purity is not as high.

@khookhoo2956

6 жыл бұрын

Successful Engineer i see..., this is what i understand is to add a gold button in the pregnant solution, slowly add sulfumic acid powder and observe the reaction of the gold button, stop adding sulfumic acid when there's no more reaction on the gold button, and then add the SMB (mix with water) into the pregnant solution and wait till the gold dust settle down. (SMB/ sodium metabisulfite) 2grams if expect that there is 1 gram of gold. Am i correct?

Hi sir I use Sulfamic acid and after using Ascorbic acid I have brown powder or black powder but it's not gold what's problem?? And where is my gold?? Thanks sir

@successfulengineer

3 жыл бұрын

Hi Emad, the brown / black powder is usually almost pure Gold! Super fine Gold powder is often brown like mud, or even black. You now have to do a wash of the powder woth water and Hydrochloric acid, then melt with a gas torch. See my video about melting the Gold powder...

@emadfarag6517

3 жыл бұрын

@@successfulengineer Thanks for answer friend I try to melt it with electric machine 1100 degrees over 30 ment I have just same small black stone with only half gram of gold it's something makes me crazy 🤪 because I am sure I have much gold from ram fingers and old pantum pro prosessor Some Tim thinking maybe problem with Sulfamic acid it's better if I use urea Please help

great video, now i know, too much adding sulfamic acid will contaminate the solution..thank you sir

@successfulengineer

3 жыл бұрын

Thanks for the comment, and good luck with your recovery.

@raymondreyes8046

2 жыл бұрын

How do u fix it?

i add urea and smb but gold wont drop

@successfulengineer

5 жыл бұрын

It is very difficult to give any advice without quite a lot more detail, what is the source material ? How much acid did you use ? If all else fails you can always cement out on a Copper bar.

Can we use urea for denox

@successfulengineer

5 жыл бұрын

Yes, many refiners still use urea

@georgeindia5103

5 жыл бұрын

@@successfulengineer thank you

Why can't you just use sunlight to denox? Nitric acid breaks down in direct light, dosen't it?

@successfulengineer

3 жыл бұрын

I guess for the same reason that you don't use sunlight to turn Silver Chloride into Silver metal, yes, technically it would be possible, but so slow that it would be impractical. You could just leave the solution on low heat for long enough if you wanted to denox without chemicals.

are you sure thats not brass? nitric acid isnt supposed to react with gold

@successfulengineer

2 жыл бұрын

Which part if the video are you referring to? Can have a look and explain. From memory, the only reaction in this video was Sulfamic acid with Nitric acid

@WeebRemover4500

2 жыл бұрын

@@successfulengineer ohh, i thought it was reacting already before you put in the sulfamic- but wait a second, why would that reaction localize at the gold?