CPU collection lot

[maynman1751]

After adding the sulfuric don't forget to filter to remove said impurities.

 

[kjavanb123]

After adding the sulfuric don't forget to filter to remove said impurities.

Thanks for your input. Nitric leach is almost done. This way I can actually recognize all the golden parts of CPU, follow by AP leach for the remaining part.

Thanks a lot,
Kevin.

 

[patnor1011]

Incinerate between those two.

 

[maynman1751]

Incinerate between those two.

This be true! Or you could make AR and dissolve your values.

 

[kjavanb123]

All,

Thanks for your info on this. Here are some updates on my latest batch of CPUs, 3 pieces of IBM p150+ CPUs.

1. Leaching the base metals using nitric for an hour


2. After second time dissolving the remains of CPUs in nitric till I got no more reaction or change of color for addition of nitric


3. After some major washing with water and decanting, I added hcl to the left over CPUs and gold foils, and drop the peroxide small increments, reaction
started at room temperature.


4. half an hour into AP leach of CPUs, I got this white solids along with AP solution, what are they???


5. Finally the gold solution after the filter was washed with fresh AP to clean up any left over gold in the filter paper.


Everything looks good, but in case in order to avoid anymore mess ups, I gotta try a small portion of solution and add SMB to it to see what goes on. Even, I washed the remains after twice nitric leach with plenty of water and decant, for some reason i feel that white stuff are impurities that got into the gold solution. So please advise if anyone is familiar with that.

Thanks and regards,
Kevin

 

[rewalston]

You didn't incinerate your solids before you put them into AP, you can't wash nitric out with water, the only way to get rid of it is to incinerate. Then you can use AP to get rid of the rest of the base metals and salts.

Rusty

 

[kjavanb123]

Opps,

Thank God i didnt do anything with gold solution yet, so according to Steve, I gotta drop all the impurities and gold by dropping a copper rod into the solution.

Regards,
Kevin

 

[lazersteve]

Kevin,

Your pregnant gold solution is ready for SMB in my opinion.

The white powder in your second nitric run, is likely a yellow tungsten compound that easily dissolves in strong base solution. This stuff will foul up your beakers if you let it dry so clean them quickly after your filter out the nitric solutoins.

I can't help but notice your beaker is dirty that you are using to dissolve the foils. In fact it appears as though the walls of the beaker are coated with PGMs. You should always work with clean beakers and flasks when recovering and refining your metals to eliminate contamination from your previous works.

Steve

 

[patnor1011]

In my opinion to go from nitric leach to AP is at least unusual. I would dissolve foils in AR, filter, precipitate with SMB, wash and then run powder second time. Even thou you used AP you will have to run your powder second time anyway in order to get really pure gold so whole AP thingy was just waste of time and chemicals IMHO.

 

[lazersteve]

Pat,

Once the base metals and silver are removed with nitric acid, the method by which you dissolve the foils is pretty much arbitrary in my opinion. I routinely use AP to dissolve recovered foils and fine powders. I also use it to dissolve PGMs on occassion.

If I have a large amount of wet gold powder, metallic gold over 18kt, or chunky dried gold powder, aqua regia is my first choice for dissolving the gold.

The keys to obtaining pure gold are removal of the base metals and silver, proper wash processes, attention to detail when cleaning glassware, and good melting practices.

I use nitric acid before dissolving the recovered gold when I'm interested in recovering the silver.

Steve

 

[patnor1011]

Wouldn't be HCl/Cl better cost-wise than AP? Well for me it may be better as I can get 3l of bleach for price of 0,1l H2O2.

 

[kjavanb123]

Edited

That is all i gotta say, I was trying to upload a picture despite being frustrated at this latest batch and gold percipitation which really edited me off.
I leached 3 pieces of IBM chips that were gold lids all the way, per my previous post, I leached twice using nitric washed and decant with water, then did AP on the remains. It produced yellowish solution plus some white powder, which was filtered, then I added fresh AP to the filter that completely dissolved any gold stuck in the filter paper. Thinking this massive looking IBM CPUs would have at least 0.2 grams of gold, not less, i was expecting at least 0.6 grams of gold powder, after I dropped SMB into the gold solution, waited for 30 mins, and as you can see from the pictures it turned brownish, and some gray color percipitant formed at the bottom of beaker, I washed with water, boiled it, and decant still no color change, I added one round of ammonium wash, nothing happened to the powder, then i added hcl to it and boiled, it seemed majority of it got dissolved in hcl and nothing left at the bottom of beaker. nothing?!!!!? I really got mad at this point I don't know how others do it, it really messed up.

Gold solution this morning after being sitting there for 12 hrs


Immediately after addition of SMB


10 mins after SMB addition


After 30 mins of SMB addition, there was this dark grayish percipitant at the bottom of beaker, and solution negative for gold


After adding water , boiling and decanting for 3 times, this grayish color percipitant showed at the bottom, added ammonia, boiled, and decant still there, but as soon as I added hcl to it boiled it, it was all gone, it seemed like the powder was dissolved in hcl and ammonia. I don't know where the gold went.

Regards,
Kevin

 

[necromancer]

do you have a grand total gold content for the:

3 pieces of IBM
12 pieces of VIA
5 pieces of IntelDX4
7 pieces AMD P75
2 pieces of IntelDX2 (486)
1 piece of IntelDX (486)

 

[kjavanb123]

Hi,

I processed them in separate groups. But 8 Intel DXs series resulted 2 grams. Considering part of it was lots due to mess up. I will post more data for other CPUs soon.

Regards,
Kevin

 

[kjavanb123]

Here is also a snap shot of latest recovering the lost gold powder during processing the IBM series. It vanished right after ammonium addition, but somewhat it showed up as this dark grayish color, which i redissolved in AP.

Now the new AP gold solution


After SMB addition


And finally that gray precipitant changed into the brownish color gold


I hope this pictures and details become useful for others trying to do same projects.

Regards,
Kevin

 

[tek4g63]

I don't want to be a wet blanket, and I know that you are in no mood for this, but I'm very interested in this whole thread and I don't want it to go sour. With that said, you may want to edit your last post with the pictures in it for language. I don't know how strict Harold is on certain words but if it was me I wouldn't want to chance it.

I hope to see you get to the bottom of the problem with this last run, I'm on the edge of my seat! Good luck man, I wish I could be more help.

 

[kjavanb123]

Thanks for ur info. Incineration after nitric leach, can someone tell me in simple Language how is done?

Regards
Kevin

 

[necromancer]

this topic continues here:

http://goldrefiningforum.com/phpBB3/viewtopic.php?f=38&t=1997#p146478

would be nice to have this post in one post and not ... 2...or more

 

[kjavanb123]

sorry about the reposting. I have a question regarding ammonia. Once trying to dissolve silver nitrate in ammonia, and the same time my AR was working on CPUs lots of white smokes came out of AR beaker?? how is this related to ammonia nearby?

Regards,
Kevin

 

[Geo]

thats white ammonium chloride "smoke". its tiny airborne crystals of ammonium chloride. when ammonia and hcl come into close proximity of each other, the vapors from the hcl will cause the white crystals to form in the air.