The only guy to actually respond to questions on KZread and they have to steal his camera. Geo is by far the best at explaining and answering questions about how to do the aqua regia the right way. Those that stole his camera should be jailed.

I just wanna say. You really have made this very clear and I now know what I did wrong. Thank u for sharing ur knowledge

This has been a really great video, thank you.

Thanks, your vids are great. Watching the explaining refining series now.

I appreciate all your help. I am trying to get all the details together before I run my second batch. My first batch never really worked out and I can see some mistakes that I made in my process along the way now. I am just gald that all the gold fingers and etc that I used in my first run was all free to me. I'll just chalk it up to experience. I'll let you know how my second batch turns out.

There is a formula for a volumetric weight but I can't remember it all. I used an educated guess based on weight of foils that was dissolved. Foils that you think are very clean will still be only about one third pure gold. There are other contaminants that will always get in. Nickel is a metal contaminant you will find in "clean" foils.

Thank u for your help I will try that.

So once you have precipitated, and filtered off the solution leaving the gold dust behind, can the solution be reused to refine more gold?

normally, yes. SMB will fizz when added to a strong acid any time but if it fizzes and turns dark and then clear again, that means you have excess nitric in solution. you have to gauge the reaction to know whether or not its free nitric.a good way to tell is using stannous chloride.place a drop of your solution in a spot plate or even a plastic spoon.add a drop of stannous chloride.a purple to black is a positive,if the test goes back clear after going dark,its free nitric acid.

thank's a lot mr geo...

thank you for commenting Afton. i do agree with what you say on all but two points.Bonide Brand Stumpout is actually sodium sulfite and not sodium metabisulfite. while it will work basically the same, its not actually the same.these types of "off the shelf" chemicals are not as pure as a chem supply company product.adding the exact amount needed when dealing with Escrap is impossible because the exact amount of gold in solution is not and cant be known until the drop.thanks again for replying.

Awesome tutorial, GEO.

@GeoONE

5 жыл бұрын

Thank you Janie.

@mrgreenswelding2853

3 жыл бұрын

As always janie. Sharn

when ridding solution of free nitric by evaporating,crystals may form.remove the solution from these crystal.do not toss these crystals. re-hydrate with hcl and test with SnCl.a positive means you need to repeat the process with this material.if brown fumes are not generated,you did not remove any nitric.

Thank you for the info

it really depends on how finely divided the material is. normally, Pt will not dissolve in hcl/Cl beyond a trace amount. Pd will dissolve on concentrated hcl when heated or an oxidizer is added (like chlorine bleach). dissolving mixed metals can be problematic for someone that is just starting out but thats refining. SMB will precipitate gold but not any of the PGM's (platinum group metals) which Pd is one of these. ammonium chloride will precipitate Pd. that will be for another day,

any high grade nitrate (sodium nitrate,potassium nitrate) will work for nitric acid.its a solid in prill form.try the local co-op or feed store, i use Hi-Yield brand sodium nitrate.sub 1tsp solid nitrate for 1 ml nitric acid.add HCl to the ash and heat to 150 F.add nitrate by the spoon full.add a spoon and wait for the reaction to stop and add more until all metal is dissolved.test with stannous chloride.dilute 50/50 with water and wait for the silver chloride to settle.precipitate your gold.

Yes Jeff I've done my first precipitation but it was very little. I also was able to speed up the process with carbon rods and slowly added a smb and the chlorine was driven out quicker but I have a question! Would the HCL bleach method dissolve only the gold from a mixed material of palladium and rhodium ?

thanks for the help i added about 1/3 of a cup and i dubled the water and it fell out now i get to collect it and clean it up thanks for the help

a reaction to your SMB normally means you have some free oxidizer in your solution. so if you use AR, you have free nitric acid.if you use hcl/Cl,you have free chlorine. free nitric is slightly more problematic if your a beginner.if you follow the text book procedures, you will be adding urea and evaporating down and adding hcl in an endless cycle until the nitric is consumed.

theres a couple of things it could be.it sounds like it wasnt gold powder but copper sulfate. did you test the solution with stannous chloride before and after the drop?was the solution saturated with copper before you added SMB?what color was the powder?white powder is an oxide and fine,black powder that will not stick together is more than like a sulfate.either of these will turn into slag when melted.

it means you have free nitric acid in the AR solution.if you add too much nitric during the dissolution, you must rid the solution of the free nitric before the gold will precipitate.there are a couple of ways to do this.adding copper is messy.evaporate the solution until it is thick like syrup.add hcl to the warm solution and nitric will be consumed and NOx fumes will be generated.repeat this until no more NOx fumes are formed.

Great video geo

i dilute solution 50/50 with water before precipitating.chlorine is a gas and wants to escape from the fluid.just heat to steaming for about a half hour and let cool, dilute with water.use equal amounts SMB to expected gold yield.use just enough water to dissolve all the SMB.let it sit till it all dissolves.add the SMB solution and stir. as warm fluids "gas off" faster than cool fluids. do it either cool or chilled(best).wait an hour and test with stannous.if pos, add more SMB.

That's beutifull this is the reason I can't sleep At night lol but sometimes sacrifices have to be made and losing sleep is not that big of one great job

excellent video please make more. maybe silver recovery or smelting the gold. thanks

how do you know what volume of AP or RA will how what amount of metal,is their a formula? thanks Scott

Bonide Stumpout - available at Home Depot is 100% SMB. And you will only need 1.2 grams of SMB per gram of gold in solution. You do not need to make it aqueous either. slowly add the powder to your AUCl while stirring the solution. Adding the aqueous SMB+H2O dilutes the solution and affects particle size. The more dilute, the smaller the particle size and the longer settling will take to complete.

Thanks for the infromation. Although I seen all the gold flakes dissolve in the AlCl solution I did not test to see if there was actually gold in the solution I just took it for granted. I also need to get some actual MSB instead of using Stumpout. I try some H2SO4 in the solution, evaporate to syrup and add HCl. What do yo mean when you say cement values on copper and start over. Do I use HCl and Bleach to redisolve it again. Thanks.

sorry to hear about your mom.sodium metabisulfite is sold by wine and brewing supply places.Bonide brand stump remover is sodium sulfite and will work in a pinch,check the label before using.i did buy mine on ebay from dudadiesel.since they are located in my home area, i just buy it across the counter now.

when all else fails and you know you have gold in solution,add a large clean piece of copper to the solution and the gold will cement (fall) out of solution as a black powder.many people use copper exclusively because they dont care about purity.if you want it pure, you must precipitate the right way and wash and rinse properly.

Thanks, I'll check to see if the stannous goes clear again. One other thing I am confuesed about, have a lot of circuit boards from mobiles and laptops, some people seems to use HCL to remove tin solder then use AR to disovle Gold but others use Nitric which seems to nuke everything except the gold, then AR, what would you suggest? Many thanks Rich

exactly the reason why.you can try a small scale experiment for yourself. digest a few grams of tin solder in a few ml's of nitric acid and see what happens.the stuff that forms is very hard to deal with.a large amount of tin in AP will cause the same problem but with a different chemistry. the tin converts to stannous chloride in AP and then oxidizes to become tin oxide.its not metastannic acid but its just as bad.remove as much mechanically before you process.

tambah wawasan&pegetahua oke

hydrogen peroxide is a strong oxidizer and will oxidize gold in hcl. thats what AP was used for. there are up sides and down sides to everything. the more concentrated the H2O2, the stronger the reaction. it is also more dangerous than the diluted form. it is less forgiving if you have a spill than bleach. 3% isnt too bad but 30% and higher can scar.be careful when working with H2O2. remember,H2O2 is half the ingredients of rocket fuel.

helpful hint to the public: when reusing empty bottles, please mark the bottles with the new solutions / solids "safety comes first" Geo may have missed doing this for the video just to show & keep people recycling and saving money on buying new bottles.

@GeoONE

8 жыл бұрын

+david clarke Yes, thank you for the heads up. It is very important to label any bottle or container. A practice that I now perform religiously.

spent solutions should go to the stock pot to recover the trace amounts of values.evaporate to a manageable amount before adding more solution.certain solutions can be re-used though.check the forum and search for butchers post or maybe send him a pm for a list of re-usable solutions.

possibly referring to free nitric acid.AuCl by its very nature is acidic.if you were to neutralize with a strong base,all metal would precipitate.the best way to deal with free nitric is to not add more than is needed to begin with.according to C.M.Hoke,add 1 OZ sulfuric per quart to the solution and evaporate to a syrup and add hcl.it may take more than once.upon each addition of hcl,NO2 will be evolved reducing the free nitric.like i said,its easier to just not add too much to begin with.

i would like to correct this. i left out a very important step. when you evaporate to rid solution of free nitric, you must add sulfuric acid before evaporating. add 10% of volume sulfuric acid and evaporate to a syrup. add hcl in small increments and stir. NOx will be emitted. repeat until no more NOx is produced.

an easier method is to add a button of gold and heat until the nitric is consumed. that way,you dont add more chemicals and you recover the used gold at the end of the process.the easiest way is not to add more nitric acid than is needed to complete the process to begin with.free chlorine is easy, let it set out uncovered until it evaporates out on its own or gently warm it to drive it out. double the volume in water before you precipitate, YES.

Thanks, I think that I give that copper sheet in the solution idea a try... maybe the gold will cement out and then I can clean it up a bit and see what I get. I'll let you know what happens.

thanks a lot sir

use a very strong magnet to remove as much iron and magnetic material as you can.if you have access to nitric acid, give the ash a good wash in warm,dilute nitric acid.dilute 50/50 nitric to water.this will help to remove any base metal left.if you have no nitric,use poor man's AR to process the ash.there will be too much copper to successfully use HCL/Cl.some of the legs are copper instead of iron.i would suggest doing a small batch from start to finish before dumping serious money into it.

it sounds like your gold dust was actually copper sulfide.when you add SMB to a very saturated copper solution,you will get some copper sulfide precipitate.after you precipitate the gold from solution,you must wash the powder to remove any salts left behind.ive not made a video of these washes yet because of the weather.i will list the washes here but you must know the order and frequency of the washes to be effective.(1)hcl boil(2)water boil(3)ammonia boil(4)water boil(5)hcl bath(6)water boil.

be sure to check the name of the chemical in the stumpout.it may be potassium nitrate instead of sodium sulfite.

Hi Geo, I tried this method not too long ago & I had some problems with it. the pregnant solution PH was 1, SMB drooped a nice brown powder but it was all slag when melted. I wonder does very low ph interfere in preventing the gold to drop or that I haven't got my gold in solution from the start, stannous chloride test came negative

Hello again, I seen another video on precipitating the gold out of the AR solution with SMB and one of the comments below the video says to make sure that the solution is neutralized or at least has a low PH before you add the SMB... Is this true? Or would just adding water to the solution and letting it set at room temperture for a while do the trick?

Ah is that why you use AP bath on depopulated boards i.e. no nitric and tin. I really appreciate your replies and your videos, they are a real help to new starters.

Hello, I was wondering when I have incenerated my memory chips to ash and cleaned it up to get the gold out, do I have to prep the gold ash in someway before I disolve the gold ash in HCL and bleach?

do you ever do processing stuff for other people for part of the take ? i was just given more than 20 lbs of ram sticks and would prefer to have someone process them for me. i saw the vid of the silver and it sounded like thats what you were doing. thanks for all the info.

@janiechristian4695

5 жыл бұрын

Yes, lol

I have been taking some notes on how to precipatate the gold out of solution for my next bach. I was wondering how much you duluted the solution with water before you added the SMB. I beleive that my last solution had to much cholrine in it when I added the SMB because I got a lot of fizzing when I added the SMB and nothing really happened. I guess I need to evap the solution more. Also do you add the SMB to warm water to dissolve it or not. Is there a step by step book on how to do this?

gently heat the solution until it is steaming. that will drive off the SO2 faster making the gold drop faster.

Hello there again Sir Geo. been experimenting with the AR process further. So far I have managed several ounces from the above process. The other day I had something cool happen to me and I want to share it with you. I am Not going to quote Hoke, for everyone seems too. Upon collecting 200 grams of various Au grams ranging from 5-50-150, etc in various (K) forms from the acid tests, I used a 3Kml beaker, and made the AR solution of 400ml. Everything worked fine for the first 35 mins, then it stopped. The ambient outside temp was 88-92, the reaction produced a dark green to light green foam with the dark brown gases from the HNO3.................approx. 2-3 hours later I proceeded to test with SC and the container content was vary Solid with a green metal salt and a lighter tanish to the bottom. I tehn was able to test with Q-tip and SC, the result was a partial purple medium color, which I am crediting to the other elements as well, correct me if I am wrong please. Thinking back to the acid ratio to the amount of Au to be dissolved, I believe I erred in the amount of AR solution to the amount of AU to be dissolved. So now to my question for you, "In the total weight of material to be dissolved, I know that there is Not 225g of Au, but molted together is copper, tin, lead. So does the formula of AR need to be increased with the "total" weight amount of material, in conjunction with the Au.". Thank you for your time.

@GeoONE

10 жыл бұрын

Based on Hoke's 4 fl oz HCl : 1 fl oz HNO3 Values are approximate as condition such as heating and evaporation or purity can vary figures a little. 1 gram of gold will dissolve in 3.8 ml HCl : 0.95 ml HNO3 10 grams of gold will dissolve in 38 ml HCl : 9.5 ml HNO3 About 8 table spoons of HCl : 2 table spoons of HNO3 will dissolve one troy ounce of gold. About 120ml HCl and 30ml HNO3 will dissolve one troy ounce of gold. 4ml HCl and 1ml HNO3 will dissolve 1 gram of gold. Since copper's molarity is greater than gold, it takes twice as much AR to dissolve an ounce of copper as it does an ounce of gold. Approx. 2.8ml diluted HNO3 (70%HNO3 mixed with water 50:50 mix) will dissolve one gram of silver. Approx. 8.3ml of this same diluted HNO3 solution would dissolve one gram of copper. You must calculate for the total weight of all metal.If during the dissolution the reaction stops short of all metal being dissolved, the reaction has been depleted of one component or another. The three major components of an AR dissolution is 1. hcl 2. nitric acid 3. metal to be dissolved. If the reaction stops short, add the least obtrusive component which is hcl first. If the reaction does not start again, add nitric acid. If the reaction still does not start again, then the metal has become passivized and the reaction should be considered complete. The remaining metal may have to be inquarted with silver to complete the dissolution. Silver in AR will create white silver chloride which mixes with the gold powder causing it to look lighter than it should.Washing the recovered gold powder in a hot ammonia bath will dissolve the silver chloride so it can be rinsed out.Also, I would recommend a second refining for gold powder recovered from such a mix of metals.

Geo sir I have a black liquid suspension of gold in aqua regia. I added SMB from Stump Out to precipitate but it did not work. It fizzed, but the SMB fell to the bottom and the black liquid did not precipitate the gold. What should I do now?

Hello again, first of all I thank you very much for your help, but how do I make poor mans AR. I have HCL but I dont have the other ingredient or really know what it is to make it. Can I get the other ingredeant from Home Depot and how do I mix it. and when I use it on my ash product then how do I process that to get the gold out.

Geo... A observation and question for you. So I went to dissolve my foils and put my Muriatic acid first then got my bottle of bleach out. Well I put some in, no real reaction. Then I put some more and mixed it up with a plastic spoon. I noticed that the gold flakes were actually dissolving. I put a little more acid in and more bleach. More dissolved but no big reaction between the acid and bleach. Come to find out that the bleach I was using had expired. I had no idea that bleach actually had a shelf life. Now that being said.... If the gold still dissolved and I go ahead with the normal process 1. Should everything still be ok with the gold I have? And 2. Would it not be now safer to use expired bleach because there is less of a reaction between the acid and old bleach? Just curious.

@GeoONE

8 жыл бұрын

The gold that's in solution is okay to finish processing. The bleach itself is not what oxidizes the gold, it's the chlorine gas generated by the sodium hypochlorite decomposing in the acid. By using bleach that has decomposed over time, you are just adding salty water and a little sodium hypochlorite to your gold foils. It's the same thing but only weaker. you can get the same effect by diluting the bleach with water before using it. Even though it seems safer than nitric acid, it is still just as dangerous and just as toxic. Next time, use a pipette or glass dropper from the pharmacy and add the bleach fresh and full strength slowly at the bottom of the solution instead of just pouring it in or dropping it in from the top. I have found that it helps keep the chlorine in the solution better.

@Ph0t0bug

8 жыл бұрын

Oh I completely understand about the safety. I was just referring to the violent reaction with all the bubbles and gasses developing quickly. All my chem stuff is done outside with at LEAST a fan pushing vapors away from me. :) Thanks again!

+geo so since I have gold powder from just one run, I should re-dissolve it and it will be even more pure? I was under the impression that it would be completely pure after just one run.

@GeoONE

7 жыл бұрын

Gold will never be pure with just one drop. It depends on what you want for your gold. If you are trying to get it bullion grade, it takes quite a bit of effort. Using just SMB on two separate refines, you will most likely get around 99%.

ahh thanks ill look now thanks

Good video! Tell me please, how did you neutralized aqua regia before you used SMB? What is the best chemical for neutralization?

@tikojj7707

6 жыл бұрын

U can use urea for neutralizing aqua regia but urea just kill nitric acid. After urea filter then add smb.

I had AuCl which was a beautiful clear yellow color but when I put the SMB (stumpout) nothing happened.... so I added some baking soda to nuetralize the solution and then added some more SMB and then the solution started turning a dark color which I let set for 7 days. After that time I noticed that there was a black dust looking substance in the bottom I cleaned it and melted it but it just burned up, no gold. I test the clear solution with stennous cloride the drop turned brown, any ideas.

Rhodium will not dissolve in either hcl/Cl or AR or nitric acid. if you dissolve jewelry with AR (which is not recommended) and have shiny white flakes that will not dissolve, thats Rhodium. Rhodium is also a PGM.

Geo as always great video with detailed information. When your done percipitating the gold solution and before you do a melt how many times do you wash your powder? I have read to wash 3 times in boiling HCl and then 3 more times in distilled water. Are all 3 of the HCl washes necessary?

@GeoONE

9 жыл бұрын

It really depends on the material you start with. If the material is pretty clean (high percentage of gold) starting out, one wash or even no wash will be enough. If it's the first refine from CPU's and the drop is almost black, it may take several washes to lighten the powder. I always do a second refine out of habit. I have been known to dissolve and precipitate the same gold almost a dozen times before I'm satisfied. Every time you drop the gold and wash the powder with hot HCl, it gets more and more pure.

@travisbunch3362

9 жыл бұрын

Thank you for the information, looks like I'm going to be doing some extra washes cause my first time refining I want to get the gold as pure as possible. I think I will make a video next week (weather permitting) of my process so I can show what I've learned from the GRF and all the great refiners on KZread who share their videos. Thank you again Geo your response and information is always greatly appreciated. Travis

Hi Geo, this is awesome... Question tho, after my gold drop with SMB, my liquid still tests positive with Stannous. Do I redo the SMB? And when have the "liquid gold" do I dilute it before SMB? Its pretty strong with the HCL and bleach, do I dilute with water then add SMB??

@GeoONE

6 жыл бұрын

When you drop gold with SMB, you need to decant the solution from any gold powder and then heat the solution almost to a boil. This drives out any excess SO2 gas. Allow the solution to cool and then test with stannous chloride. If you don't heat and cool, you can get a false positive. More brown than purple or black. After heating and cooling, test the solution again. If it still test positive for gold, add a little more SMB to see if any more gold will drop.

@kathy5939

6 жыл бұрын

Thank you, I will. I have found a NEW hobby, thanks to your and a few others videos. HAGD.

What does it mean if the smb bubbles when added to the solution should I have diluted the solution with the equal amount of distilled water

is there a way to get the gold to settle faster?

i put smb in my ar and it fized like mad small black trails formd heading tords the bottem and apered to redesolve back in to slution any ideas i think the acid is to strong so i fed it sum fine copper wire

I'm new to this and out of all the videos out there I enjoy your the most they are more detailed then most. If my solution is copper soaked how do I remove it or can i?

@GeoONE

10 жыл бұрын

dealing with a "dirty" solution is simple as long as you know what to do. normally, a solution thats saturated with copper will not hold gold easily. be sure to test the solution with stannous chloride to be sure gold is in solution. drop the gold as you would a nice clean solution but keep in mind that your drop will not be pure. in a copper rich solution, a mechanical process occurs called "drag down". the precipitating gold will "drag down" copper with it. your resulting gold powder will be contaminated and will need to be refined again to make it pure.

Great vid. maybe you can help w/ prob? My 1st time w this. had nice yellow sol. Bought SMB from ebay(came in a baggy-bad sign).when I added foamed a lot sour acid smell,& did not precipitate. got a dark orange sol. How screwed am I? Is there a way to test SMB? Not sure what I put in now(baking soda?).

@GeoONE

10 жыл бұрын

Was it an AR solution? When adding dry SMB to an AR solution, it will foam and fizz. This is a sign of free nitric in solution. Did you test the solution with stannous chloride? Free nitric will stop a gold drop. It will also cause a false negative with stannous. If it was a hcl/bleach solution, there could be free bleach in solution. while chlorine is not as long lived in solution, it will cause the same effects as free nitric. If you smelled a strong sulfur smell, the SMB is good.

+Geo - Great Job on the Videos. Had a quick question about SMB. Once you have dropped the gold does that render the solution unusable for gold recovery?

@GeoONE

8 жыл бұрын

+Wilson Revelle Spent solution should be reduced by evaporation and added to your "stock pot", a container that is non-reactive that will hold a reasonable amount of solution. Since there is always trace amounts of values left in spent solutions, it is best to concentrate the solution and add a piece of solid copper to cement those values out. This is cleaned up periodically and the black powder is collected and refined. Since spent solution is already contaminated, it is not recommended that you dissolve precious metals in it again.

@Ph0t0bug

8 жыл бұрын

Ok.. Long and short fresh every time... Cool.. Thanks for the great info!

@Ph0t0bug

8 жыл бұрын

+Geo so the concentrated solution with the copper in it. I put solid copper in the stock to cement the copper and refine that. Right?

@GeoONE

8 жыл бұрын

+Wilson Revelle The copper will not cement copper, but it will cement any metal in the solution that's less reactive than copper. Less reactive metals are mercury, silver, gold, palladium, platinum and other rare metals. The metals you will look for are metals that you added earlier, like gold and palladium. Silver should not be in a HCl solution since silver chloride is a solid. When you precipitate precious metals, there will always be some left behind. The copper is used as a collector of these small amounts and bring it back to metallic form. This metallic precipitate is collected and processed later.

I WAS HOPING YOU COULD HELP ME, I CAN NOT SEEM TO GET MY GOLD TO DROP, I MADE THE STANNOUS CHLORIDE AND TESTED POSITIVE FOR GOLD AS I KNEW IT WOULD BUT I HAVE A JELLY FORMING RATHER THAN WHAT I SEE OTHERS GETTING. PERHAPS I NEED TO ADD MORE SMB? or do i need to neutralize the acid with urea?

@mattcsencsics7805

8 жыл бұрын

+Angela Mooney I don't know if you have solved this issue or not but 2 things one it thin out your aucl with distilled h2o and second is to dissolve your sbmb in water and then add the sbmb slowly into the aucl quick formula for a example would be 4.6 g of aucl into 15 ml of h2o , and 8g of sbmb into 30ml of h2o. and this will produce hcl fumes and will produce heat so please do it very slowly and with proper ventilation and the safety equip for this. and depending on your concertration of gold will dictate how much gold you get out of it . as always test your aucl with stannous test to very the metals in your solution.

@GeoONE

8 жыл бұрын

+Angela Mooney I apologize that I have not responded to your question. Sometimes life gets busy and comments get skipped. Jelly forming when adding SMB? Two things jump out at me. Either your SMB is not SMB or there is a highly reactive base metal in your solution. Aluminum chloride turns to jelly when the PH is raised. Zinc chloride also gels. I'm sure by now you have overcome this obstacle but I would have had to have more information to have even made a guess. If there was a lot of tin in solution and you were adding stump out, you could have been adding the wrong brand. Spectracide brand stump remover is potassium nitrate and not sodium sulfite. If there was an excess of tin in solution and you added potassium nitrate, the tin would have precipitated out as hydrated tin oxide which is a jelly like substance that acts like jello. If you did not figure it out, reply here and I will try to help you.

Hi I have the same problem when dropping gold using SMB. If the SMB reacts with the gold solution does this mean there is still nitric to be driven out?

Was there another video after this one to show how much you precipitated out of the solution. I subscribed but I cant seem to find it. Whats the next process after this?

unless you dump it out, you didnt lose your gold. of coarse, if you only had a small amount, you may not be able to see the gold drop.it may be no more than a dusting on the bottom of the container.

again, what happened if my bleach contains some caustic soda as ingredient, will this produce a different result when used with HCL to dissolve my gold foils? Yes, I am asking this question because, I have seen a bleach that has sodium hypochlorite 3.5 w/v and some caustic soda as ingredient too. Or is there a bleach that has just only sodium hypochlorite as the only main ingredient?

@GeoONE

7 жыл бұрын

Plain chlorine bleach such as Clorox brand will have only sodium hypochlorite and water. Try not to use bleach that contains other ingredients such as dyes and fragrances. Chlorine bleach with other non-chlorine bleaches will not work well for dissolving metal. The sodium hypochlorite is somewhat of a base anyway. Any caustic will just waste the HCl and neutralize it from the beginning.

@thankgodsylvesteromoigui5921

7 жыл бұрын

really a big thank you for your responds and I like your answers, God bless you..

good day geo. hate to be a pain in the butt but have another question, did a drop got the fine gold powder and after the sc test still shows positive for gold added more stump out and nothing?? what to do ???

@GeoONE

8 жыл бұрын

The SO2 gas formed when you add the SMB will cause you to get a false positive. Heat the solution until it steams for about a half hour. This will rid the solution of the SO2. Let the solution cool completely down and test it again. If you still get a purple stain, add a little more SMB and stir. If you are getting a dark stain after warming and cooling and still no more gold drops, it is most likely one or more of the PGM's. I believe the heating and cooling should fix your problem.

@frankmiller1412

8 жыл бұрын

+Geo thank you again brother. This batch was from ink cartridge ribbons and other misalliance ribbons

Thank you for the Video Geo Well done. Doing this outside of course an it was a bit chilly low 4O's. Tried a small batch 1OO Grams mixed pins an 1OO CPU in A/P...Do to the temp I Gently heated both batches then cut the heat an let sit over night in the garage. Both batches are clear as can be. If I add 1 or 2 drops of Peroxide it turns yellow. Do I still need the HCL/Bleach method are can I go right to the SMB . There only test batches but still hate to lose it none the less. Thanks again for the Video I have Subscribed Now going to go watch some more of yours...Jim

@GeoONE

6 жыл бұрын

The HCl/bleach is to dissolve the gold foils after AP is finished. Did you have any gold foils? If not, The gold dissolved and cemented back out onto the base metal present. As long as your stannous was good, it sounds as though you had a negative test. So, did you have foils or no?

@jimboater405

6 жыл бұрын

Hello Geo...Thank you for responding an I apologize for the delay..I did not get any foils out of those 2 batches they where small incase something like this happened ..(magnetic an non magnetic pins)...I took a couple Oz of one batch an mixed a small amount of Stump Out. Turned an Ugly color an stunk bad. Then the next morning it was cleared up with little black specs in the bottom. I'm Hoping that's what I'm after. I have a good size amount of E-waste to process just starting small so not to lose anything. I do not have Stannous ..Just yet..going to make some out of 95/5 Solder ..Once again Thank you for a quick response an have a Great day

Steer or stir?

Sorry to bother you agian Geo but had another question. So I dropped out my gold and have a small pile of black at the bottom which should be the gold. Ran a test on the solution and am still getting a positive test for gold. Should I go ahead and put in more SMB in the solution to try to get the rest to drop or filter what I have and then add the SMB afterwards to drop some more? Starting solution is around 600ml and so far SMB I used 30 grams. Thanks again for your great videos and help.

@GeoONE

8 жыл бұрын

How much gold do you expect was in the solution? You can expect a gram of SMB to precipitate one gram (+/-) of gold. You may be getting a false positive. Is the result of the test a nice purple to black or a really dark brown color? Sulfur dioxide is formed when SMB is added to acid. SO2 will precipitate the tin out of solution as a brown colloid. Pour the solution into a clean glass container leaving any powders behind. Move these powders to a smaller container and rinse with hot water. Put the solution back in the original container and heat it to boiling. Turn off the heat and let everything cool completely. Test the solution again. If you are still getting a positive, add a little SMB and see if you get a color change.

@Ph0t0bug

8 жыл бұрын

I don't think it would be a LOT of gold... .1 lb of pins and 1 lb of fingers. I'll do that and let you know how it goes.

@Ph0t0bug

8 жыл бұрын

Ok. There was more in the solution. How long are you putting the solution to boil to get all the chlorine gas off? I boiled for a solid min then turned off the heat and let it sit until it was completely cool. Not only was there black powder on the bottom but the test was + so filtered off the solution and boiling it again right now. Added the powder to the other. Just waiting for the cool down to check it again.

@GeoONE

8 жыл бұрын

If you dissolved the gold using bleach, the sodium hypochlorite has to boil for a few minutes to decompose. Just warming the solution will not destroy the hypochlorite. So boil for a few minutes and let it cool completely. There's really no set length of time to boil. You just don't want the solution to boil dry. Sodium hypochlorite boils (decomposes) at 101°C so the solution must reach this temp or greater.

@Ph0t0bug

8 жыл бұрын

Got it. Thanks! I'll let you know how it goes.

thanks for your video, but my question is 'do I precipitate immediately after dissolving my gold foils in HCL and Bleach, thanks for your quick responds

@GeoONE

7 жыл бұрын

The gold chloride solution is viable for an indefinite amount of time. At least years as long as the solution does not evaporate dry. You can dissolve the foils and take as long as you want before precipitating the gold from solution.

@thankgodsylvesteromoigui5921

7 жыл бұрын

this is really interesting, I want to say a big thank you to your responds,

If my solution was diluted, and a lot lighter grey after adding smb dissolved in water, will that impact the process of the gold dropping?

@GeoONE

10 жыл бұрын

it shouldnt effect the drop at all.if the powder is a light color instead of tan or brown, it may be contaminated with something else. after the drop, boil the powder in plain water in a clean vessel. this will remove any soluble salts and should make the powder a little darker.

Geo thanks for the great video, lots of information on there. I know someone that has gold pins for sale. what is a fair price to pay per pound? Does $25 sound OK?

@GeoONE

8 жыл бұрын

+Ken Vital It depends on the pins. If the pins are high grade, fully plated with gold, you can expect about two grams per pound. At $37 per gram at spot price, the pins could be worth as much as $74 a pound in gold. If the pins are low grade or have low grade pins in the mix, it brings the value down greatly. Low grade pins (slot pins from a mother board, connector pins with gold on the tip only) are about 0.01% gold by weight. That means it takes 10 pounds of pins to make one gram of gold. So low grade pins have $37 worth of gold on ten pounds of pins or about $3.70 per pound. I hope that helps.

I have a problem. I have Dtv boards out of the dish lnb. Did the AP soak for 3 days. Was not green more brown. Filleted my mix no gold stuff look more like copper. What do I do now? Please help

@GeoONE

10 жыл бұрын

when the solution turns brown, it means the solution is saturated with copper. stop the bubbler and let it settle. remove the brown fluid and replace with fresh chemicals and start again. too, TV boards that have gold plating are hard to process because the gold breaks down into a fine powder. it doesnt stay in flakes so looking for large flakes may be impossible.

hi geo , i am using sodium sulfite to precipitate gold in god soloution. that is right process way or not ? and i put that sodium sulfite to the gold solution. and stir it with crystal nod until i get that gold cement on the bottom of the beaker. right , and then pour solution into the filter to get that cement from the bottom. and let the cement gold dry out then i melt that gold in crucible. this is my first time , so can u give me some advise everyone that know about how to process that solution , thanks. p.s if i miss something els , can everyone tell me about that , thanks .

What is the solution that you have added the Royal Aoualemadh water to precipitate gold

@daneenorris5417

5 жыл бұрын

Mohamed Nabel rover.ebay.com/rover/0/0/0?mpre=www.ebay.com/ulk/itm/183601477767

i see you in goldrefiningforum :D

Hello Mr Geo, can we use potassium metabisulphite instead od sodium? thank you

@GeoONE

7 жыл бұрын

Yes. It works the same way.

@helderfreitas6760

7 жыл бұрын

Thank you

there is a false positive, if the solution is almost black and its hard to get a good read on the test, dilute a sample (10ml's is a good sample) 50/50 with fresh hcl. test this diluted sample with stannous chloride. a false positive will be brown and a positive will be some shade of purple. a false positive is caused by adding too much SMB to a very copper saturated solution.

it can be done.as the gold precipitates,it is re-dissolved using up the free nitric.when SMB is added in excess, it causes "drag down" of other metals and contaminates the gold powder.it will need to be refined again.warming speeds this up.you are not doing any of this in your home are you?all the fumes generated by these processes is corrosive and toxic.SMB in acid decomposes into salt and SO2.SO2 will make sulfuric acid in the moisture in your lungs.check out wiki on SO2.

Hi Geo - You know you said you can drop the gold with copper bar as a black powder, I wondered whether this mesh size was significantly finer, than the gold mud, when comparing the two? I was wondering with regarding to precious metal clay, which calls for finely divided gold powder, whether in fact this black fall out, would in fact make a better precious metal clay, in that when heated the pmc particles being finely divided will produce a better final product because of the particles being closer together. (Digitaria)

@GeoONE

9 жыл бұрын

digitariaification I'm afraid I wouldn't be much help when it comes to precious metal clay. I've never really had the chance to check any out before. Without know what the application is or the use of it, I couldn't even make an educated guess.

@digitariaification

9 жыл бұрын

thanks for reply - but the gold powder, how can it be made finer of a lower mesh/micron? :-)

@GeoONE

9 жыл бұрын

Perhaps a sonicator. en.wikipedia.org/wiki/Sonication from wiki : Sonication can be used for the production of nanoparticles, such as nanoemulsions,

i cant evaporate the solution no out side heat source can i just keep adding smb i seeen that in a video thanks for the real fast responce

Hi Geo, i have some problems in precipitating gold like you did. I Heard that Urea can be used instead of SMB, actually i tried it on a 10ml AR solution, my solution became dark grey but the gold did not precipitate. Am I doing it wrong? Or simply Urea is not good to do this process? Thank you in advance.

@GeoONE

9 жыл бұрын

Urea is used to remove excess nitric acid from the solution. Even this is an archaic method for that purpose. Urea will not precipitate gold. If your solution has excess nitric acid, SMB will not precipitate gold. The gold redissolves as fast as it forms. If you have a aqua regia solution that you know contains gold and the gold will not precipitate, use sulfamic acid to kill the excess nitric acid and then the gold will precipitate using SMB.

@alessandrosgarbi3164

9 жыл бұрын

Geo Thank you very much, however in italy is not easy to find sulfamic acid for sale. Even if archaic, can i use Urea to kill the nitric excess? Will urea affect my solution in some unwanted ways while precipitating gold with smb?

@GeoONE

9 жыл бұрын

Alessandro Sgarbi Yes it will work and refiners use it quite a bit. It is hard to master for some because it will raise the PH to the point of dropping base metal also. The simplest way is to avoid adding too much nitric acid to begin with. Do not premix the aqua regia solution prior to use. Start with the approximate amount of HCl at 90% and distilled water 10%. Add this to your material and then add the nitric acid in increments when the reaction stops. Add nitric acid and wait for the reaction to stop and then add some more. Stop when the material is nearly dissolved and add very small amounts of nitric acid after that until all of the metal is dissolved. In this way, you will not have to neutralize the nitric acid because you didn't put it there.

im sorry about not posting the update as promised. the camera with the videos on it was stolen from my vehical and the videos is lost. i will make a new video of drying gold powder and melting the button from another batch and post it instead.

thank you for ur eductional series i need to ask you a couple of things you said in your video that you have about 6 gram of gold before precipitating how did you know

@GeoONE

9 жыл бұрын

The solution had roughly 2g of foils from a previous video and four grams of dirty gold powder reclaimed from a mixed metal AR solution.

wow jeff it is bonide but it does not the the chemical listed at all on the contaner it is not on there i dont know what i have

i did make one but it was still in my camera when it was stolen from my vehicle. there were several clips that i hadnt posted yet. i will have to re-do them all. sorry about that.

if i dissolved a amterial in AR and i want to search for gold if there is or not, what is the proper indicator? another Q. do i have to neutralize the AR with soda before adding SMBS to perticipate the gold ?

@GeoONE

7 жыл бұрын

The test for dissolved gold is stannous chloride solution (SnCl2). A small amount of tin metal dissolved in hydrochloric acid. Place a drop of the AR solution in a white plastic spoon and add a drop of stannous chloride solution. If there is gold in solution the solution will turn black. Purple to black is a positive test for gold. Do not neutralize the nitric acid in AR with soda. Use sulfamic acid added in small increments until there is no more reaction. It works better when added to warm to hot solutions.

@muhammadghreeb5131

7 жыл бұрын

ok thanks for reply, but what is the use of sulfamic acid?

@GeoONE

7 жыл бұрын

Sulfamic acid removes the excess nitric acid from the solution. Gold will not precipitate if the solution has excess nitric acid. By removing the excess nitric acid, the SMB will drop the gold faster and much cleaner.

e bay you can get all the stuf you need on ebay

first, why would you think you have Pd mixed with gold? if you precipitated with SMB, it is very specific for gold. the chemical reaction forms SO2 (sulfur dioxide) which will precipitate gold and not any other noble metals.there is "drag down" that will pull base metal down with gold, but it is a mechanical reaction. if you have gold and Pd mixed, it has to be dissolved and precipitated in the right order. i would mention that SO2 gas from a bottle will precipitate gold as well.

tin should be removed before nitric is applied if at all possible.tin in nitric acid makes metastannic acid,a form of tin oxide.it is not soluble in acid or water.it has the consistency of jello and will trap your values.you cant filter solution with this goop in it.it has to be calcined and then removed with hcl.best to remove it first.

im not using this stuf in the house no way my room mate has copd i dont eavin open the windows on that side of the house thanks for the answers i watched most of your videos on the subject im working on a batchb of 60 cpu and a 2nd batch of every thing from 2 desk top towers

how do you know you had gold in solution?did you test before you added "stumpout"?not all stumpout is the same.some is sodium sulfite and some is potassium nitrate, make sure whats in your precipitant.neutralizing with baking soda is not the right way to do this.add H2SO4 one ounce per quart of solution.gently evaporate to syrup and add HCl.NOx should be emitted.repeat as necessary to remove nitric acid.add H2SO4 once.best not to add too much to begin with.cement values on copper and start over.